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EP 2 325 409 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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23.03.2016 Bulletin 2016/12 |
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Date of filing: 19.11.2010 |
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International Patent Classification (IPC):
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Method for making a floor with flat intrados prefabricated elements and the floor
obtained thereby
Herstellungsverfahren einer Bodenplatte mit flachen Fertigbauteilen und die dadurch
erhaltene Bodenplatte
Procédé de fabrication d'une dalle avec des éléments préfabriqués plats et la dalle
réalisée par ce procédé
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Designated Contracting States: |
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AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
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Priority: |
23.11.2009 IT PR20090097
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Date of publication of application: |
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25.05.2011 Bulletin 2011/21 |
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Proprietor: Area Prefabbricati S.P.A. |
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42013 Casalgrande (RE) (IT) |
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Inventor: |
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- Manfredini, Emanuel
42013, Casalgrande (Reggio Emilia) (IT)
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Representative: Dallaglio, Fabrizio et al |
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Ing. Dallaglio S.R.L.
Via Mazzini 2 43121 Parma 43121 Parma (IT) |
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References cited: :
EP-A1- 1 350 898 DE-C- 932 930 DE-U1- 29 518 718 FR-A1- 2 669 061
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CH-A5- 571 624 DE-U1- 9 308 133 FR-A1- 2 359 941 US-A- 4 630 414
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The object of the present invention is a method for making a floor with flat intrados
precast elements and the floor thus obtained. This floor with flat intrados precast
elements can be used, for example, for making floors, for example, for residential
buildings, office buildings, or commercial buildings, (such as supermarkets, etc.),
or for sports use (such as gyms, etc.), etc. Various typologies of floors are known
in the art, which involve the use of precast elements that will be then completed
on site by casting additional concrete. Among these typologies, floor plates with
lattice girders are known, each of which comprises electro-welded steel lattice girders
and a lower slab made of reinforced concrete in which the lower bars of said lattice
girders are also embedded. Floor plates with lattice girders are made in a factory
for the production of precast elements and then carried to the construction site after
suitable foamed polystyrene elements have been fitted among the various lattice girders,
which elements mainly act as lightweight elements. These floor plates with lattice
girders are arranged on site using temporary steel struts which allow the floor plates
with lattice girders to bear their own weight as well as the subsequent final casting
of concrete as will be described below. After the operations of strutting on site
have been completed, the additional reinforcing bars (adding reinforcements) are placed.
The concrete cast by which the floor is completed is then carried out. The floor plates
with lattice girders are very frequently used mainly for spans that are not particularly
large. The floor plates with lattice girders suffer from the drawback that they require
provisional strutting which is expensive and cause a slowing down in the operations
at the building site. Furthermore, the floor plates with lattice girders often suffer
from more or less extended cracking phenomena at the intrados of the reinforced concrete
(lower) slab.
[0002] Another typology of precast elements which is very used in the construction practice
for making floors consists of the hollowcore slabs obtained by means of extrusion
or vibro-compacting. These hollowcore slabs are self-bearing and do not require, contrary
to the floor plates with lattice girders, temporary strutting; this is an undisputable
advantage of the hollowcore slabs over the floor plates with lattice girders. However,
the hollowcore slabs suffer from some drawbacks as will be better detailed below.
The hollowcore slabs are precast elements which are heavy, such that the beams which
support the floors consisting of said slabs require a greater load-bearing capacity
than the load-bearing capacity required, for example, in case of those floors made
using floor plates with lattice girders. Furthermore, the hollowcore slabs are not
provided with ordinary steel reinforcements, because prestressing reinforcements (mainly
strands) are only provided therein. The lack of ordinary steel reinforcements may,
in some cases, give rise to several problems both in the connections between hollowcore
slabs and beams and in the hollowcore slabs themselves.
[0003] In addition, the hollowcore slabs have a low resistance against transversal-bending
stresses which stress the intrados transversal fibers of the slabs; in these cases,
in fact, the cast-in-situ concrete upper slab is the only one to counteract said forces,
which has a much lower thickness than the total thickness of the floor.
[0004] A prior art example is described in
EP 1350898 in which no reinforcements are provided to project from the extrados of the precast
element, i.e. no reinforcements are provided in order to connect the precast concrete
with the cast-in-situ concrete.
[0005] In
EP 1350898 the entire slab is precast except for the upper part thereof, which is cast in place,
being thus possible to introduce on site ordinary reinforcements only at the cast-in-situ
upper slab (topping); this imposes restraints both in the mutual connection between
the precast elements and in the connection between said precast elements and the beams
supporting the elements; the slabs described in the above patent are considerably
heavy, which increases the costs for assembly and transportation.
[0006] An object of the present invention is to provide a floor having flat intrados precast
elements that are self-bearing even during the casting of the adding cast-in-situ
concrete and that can be effectively connected to each other by means of said adding
cast-in-situ concrete after suitable adding reinforcements have been placed.
[0007] A further object of the present invention is to provide a floor that, on site, results
to be lighter than the other floors that are made according to prior art, which comprise
self-bearing precast elements (such as the hollowcore slabs).
[0008] A further object of the present invention is to provide a floor that has low values
of heat transmission rate.
[0009] These and other objects are achieved by the method for making a floor with flat intrados
precast elements according to claim 1 and by the thus obtained according to claim
3, which are both the objects of the present invention.
[0010] The characteristics and the advantages of the present invention will be better detailed
in the description below of several embodiments illustrated by way of non-limiting
examples in the attached drawings in which:
- Fig. 1 illustrates, according to a top plan view, a portion of a floor with flat intrados
precast elements that is obtained according to the present invention, according to
a first embodiment; this floor is illustrated during a step of the method for making
said floor;
- Fig. 2 shows, in the same scale as Fig. 1, the section according to line A-A in Fig.
1;
- Fig. 3 shows, in the same scale as in Fig. 1, the section according to line B-B in
Fig. 1;
- Fig. 4 is a plan view, in the same scale as in Fig. 1, partially according to a top
view and partially according to a cut-away view, of a portion of the floor with flat
intrados precast elements as shown in Fig. 1; this floor is shown in a further step
of the method for making said floor;
- Fig.5 shows, in the same scale as in Fig. 4, the section according to line C-C in
Fig. 4;
- Fig.6 shows, in the same scale as in Fig. 4, the section according to line D-D in
Fig. 4;
- Fig.7 illustrates, in greater scale than that in Fig. 6, a detail of Fig.6;
- Fig.8 illustrates, in greater scale than that in Fig. 7, a precast element comprised
within the floor with flat intrados precast elements illustrated in Fig. 1 to 7;
- Fig.9 illustrates, in cross-section, a portion of a floor with flat intrados precast
elements, obtained according to the present invention, according to a further embodiment;
- Fig.10 illustrates, in greater scale than that in Fig. 9, a precast element comprised
within the floor with flat intrados precast elements illustrated in Fig. 9;
- Fig. 11 is a plan view, according to a top view, of a portion of a floor with flat
intrados precast elements as obtained according to the present invention, according
to a further embodiment; this deck is illustrated during a step of the method for
making said floor;
- Fig.12 shows, in the same scale as in Fig. 11, the section according to line E-E in
Fig. 11;
- Fig.13 illustrates, in the same scale as in Fig. 11, the section shown in Fig. 12,
in another step of the method for making the floor illustrated in Fig. 11 and 12;
- Fig.14 illustrates a detail of Fig.13 in a greater scale than that in Fig. 13;
- Fig.15 illustrates a detail of Fig.14, in a greater scale than that in Fig. 14, ;
- Fig.16 illustrates, in a greater scale than that in Fig. 15, a precast element comprised
in the floor with flat
[0011] intrados precast elements illustrated in Fig. 11 to 15. In order to facilitate the
understanding of the steps of the method for making a floor with flat intrados precast
elements which is obtained according to the present invention, with reference to Fig.
1, 2, 3, 4, 5, 6, 7 and 8, is first described a floor 1 with flat intrados precast
elements, which is obtained according to the present invention, according to a first
embodiment. This floor is one of the joists of an office building.
[0012] The floor 1 comprises flat intrados precast elements 2 of prestressed concrete, lightening
elements 3a, 3b and parts of cast-in-situ concrete 4. Each of the precast elements
2 comprises a lower slab 2a, two first ribs 2b placed above the lower slab 2a, first
connecting reinforcements 2c projecting above the two first ribs 2b and second connecting
reinforcements 2d placed at the longitudinal edges of the precast element 2, which
reinforcements are partially embedded in the concrete of the lower slab 2a and projecting
above the extrados of the lower slab 2a; the first ribs 2b are made simultaneously
with the lower slab 2a; each precast element 2 is self-bearing during the steps of
casting the cast-in-situ concrete 4; the precast elements 2 are placed next to each
other such that longitudinal joints 6 are provided between adjoining precast elements
2; at each of the longitudinal joints 6 between two adjoining precast elements 2 coupling
reinforcements 5 are provided which comprise transversal parts that are placed at
the extrados of the lower slab 2a of said adjoining precast elements 2. The coupling
reinforcements 5 consist of brackets (each of which is made by one or two parts).
Said parts of cast-in-situ concrete 4 comprise an upper slab 4a and second ribs 4b
placed at the longitudinal joints 6 between the adjoining precast elements 2; at each
one of the second ribs 4b the two adjoining precast elements 2 are joined to each
other by means of the coupling reinforcements 5 (placed at said second rib 4b) and
by means of the second connecting reinforcements 2d; the second connecting reinforcements
2d projecting above the extrados of the lower slab 2a and the coupling reinforcements
5 are embedded in said parts of cast-in-situ concrete 4; the height of the second
ribs 4b is more than twice the height of the lower slab 2a of the precast elements
2; the lightweight elements 3a, 3b have the intrados arranged proximate to the extrados
of the lower slab 2a of the precast elements 2; the first ribs 2b and the second ribs
4b are connected to the upper slab 4a by means of the first connecting reinforcements
2c, the second connecting reinforcements 2d and the coupling reinforcements 5.
[0013] The floor 1 also comprises adding reinforcements 10 comprising bars 12, meshes 9
and the coupling reinforcements 5. The adding reinforcements 10 are positioned in
place and embedded within the cast-in-situ concrete 4.
[0014] The lightweight elements 3a are placed between the first ribs 2b; the lightweight
elements 3b are placed between a first rib 2b and a second rib 4b; it should be understood
that the lightweight elements 3b also have the function of a disposable formwork for
making (by casting the cast-in-situ concrete 4) the second ribs 4b; the lightweight
elements 3a, 3b also have the function of disposable formwork for making (by casting
the cast-in-situ concrete 4) the upper slab 4a. The precast elements 2 are prestressed
by means of pre-tensioned adhering strands 11 made of high-strength steel. In each
precast element 2, the first ribs 2b comprise joining elements 7 therebelow, which
connect said first ribs 2b to the lower slab 2a; these joining elements 7, which are
a part of the first ribs 2b, facilitate the positioning of the reinforcements that
are comprised within said precast element 2, and particularly the positioning of the
strands 11. In each of the precast elements 2 the first connecting reinforcements
2c consist of brackets, and the second connecting reinforcements 2d consist of the
ends of a mesh that, in the middle part thereof, is embedded in the lower slab 2a.
The floor 1 is supported by structural elements 8 each of which consists of an inverted
T-shaped section beam made of precast prestressed concrete; the structural elements
8 support both the precast elements 2 during the first step of the method for making
the floor 1 (see below), and the floor 1 when the making of the latter has been completed.
[0015] It should be noted that in Fig. 7 and 8, for simplicity of illustration, the relevant
structural element 8 has not been depicted.
[0016] The method for making the floor 1 with flat intrados precast elements is described
below. This method comprises the following steps:
- First step: the precast elements 2 of prestressed concrete, which had been previously
made in a factory for the production of precast elements, are placed on site; the
precast elements 2 are placed by positioning them with the ends thereof on the structural
elements 8 supporting the floor 1; each precast element 2 is self-bearing during the
steps of casting the (cast-in-situ) concrete 4 at the end of the first step of the
method each precast element 2 is positioned with the ends thereof at the load-bearing
structural elements 8; the lightweight elements 3a, 3b are placed at the extrados
of the lower slab 2a of the precast elements 2; the precast elements 2 are placed
next to each other, such that the longitudinal joints 6 between adjoining precast
elements 2 are provided;
- second step: the adding reinforcements 10 are placed; said adding reinforcements 10
comprise, inter alia, the transversal coupling reinforcements 5 that are placed proximate to the longitudinal
joints 6 between two adjoining precast elements 2; the coupling reinforcements 5 consist
of brackets (each of which is made of one or two parts) and comprise transversal parts
that are arranged proximate to the extrados of the lower slab 2a of said adjoining
precast elements 2;
- third step: the concrete 4 is cast on site thereby making the upper slab 4a and the
second ribs 4b; at the end of the third step of the method, the second ribs 4b are
arranged at the longitudinal joints 6 between the two adjoining precast elements 2;
at each one of the second ribs 4b the two adjoining precast elements 2 are joined
to each other by means of the coupling reinforcements 5 and of the second connecting
reinforcements 2d; the second connecting reinforcements 2d projecting above the extrados
of the lower slab 2a and the coupling reinforcements 5 are embedded in the cast-in-situ
concrete 4; at the end of the third step of the method, after the cast-in-situ concrete
4 has suitably cured, the first ribs 2b and the second ribs 4b-are connected to the
upper slab 4a by means of the first connecting reinforcements 2c, the second connecting
reinforcements 2d and the coupling reinforcements 5, the second ribs 4b are created
through the pouring of concrete on site between lightweight elements 3a,3b positioned
on adjacent prefabricated elements 2, so that the second ribs 4b are in direct contact
with said lightweight elements 2.
[0017] It should be understood that the shape of the cross-section of each of the precast
elements 2 and particularly the presence of the two first ribs 2b provides that the
precast element 2, when the concrete 4 is being cast in place, is endowed with sufficient
stability against torsional actions; it is understood that, under particular conditions,
temporary and/or permanent retainers (not shown in the drawings) should be provided,
which are suitable to provide the stability of the precast element 2 at the suitable
safety index, even in most severe conditions.
[0018] It should be understood that the precast elements 2 are made in a factory for the
production of precast elements, on a prestressing bed at which the above-mentioned
pre-tensioned strands 11 are placed (
inter alia), by casting the concrete with which the lower slab 2a and the first ribs 2b are
simultaneously made. Subsequently, after said concrete has reached a suitable curing
level, the prestressing forces are applied to the precast elements 2, by shortening
the hydraulic stressing jacks placed at the anchoring heads of said prestressing bed.
[0019] With reference to Fig. 9 and 10, a floor 20 with flat intrados precast elements is
described, which is obtained according to the present invention, according to another
embodiment. This deck 20 is one of the floors of a commercial building. The deck 20
comprises flat intrados precast elements 21 of prestressed concrete, lightweight elements
22a, 22b and parts of cast-in-situ concrete 23. Each of the precast elements 21 comprises
a lower slab 21a, two first ribs 21b arranged above the lower slab 21a, an upper flange
21e, first connecting reinforcements 21c projecting above the two first ribs 21b and
second connecting reinforcements 21d arranged at the longitudinal edges of the precast
element 21, which are partially embedded in the concrete of the lower slab 21a and
projecting above the extrados of the lower slab 21a; in each of the precast elements
21, the upper flange 21e, together with the two first ribs 21b and with that part
of lower slab 21a which is comprised between the outer wires of the two first ribs
21b, provides a closed section; the two first ribs 21b and the upper flange 21e are
integral with each other; a portion of each of the first ribs 21b is made simultaneously
with the lower slab 21a. Each precast element 21 is self-bearing during the steps
of casting the cast-in-situ concrete 23; the precast elements 21 are placed next to
each other so that longitudinal joints 25 are provided between adjoining precast elements
21; at each of the longitudinal joints 25, between two adjoining precast elements
21, coupling reinforcements 24 are provided which comprise transversal parts arranged
proximate to the extrados of the lower slab 21a of said two adjoining precast elements
21.
[0020] Said parts of cast-in-situ concrete 23 comprise an upper slab 23a and second ribs
23b arranged at the longitudinal joints 25 between the adjoining precast elements
21; at each of the second ribs 23b the two adjoining precast elements 21 are joined
to each other by means of the coupling reinforcements 24 and of the second connecting
reinforcements 21d; the second connecting reinforcements 21d projecting above the
extrados of the lower slab 21a and the coupling reinforcements 24 (arranged at said
second rib 23b) are embedded in said parts of cast-in-situ concrete 23; the height
of the second ribs 23b is more than twice the height of the lower slab 21a of the
precast elements 21; the lightweight elements 22a, 22b have the intrados arranged
at the extrados of the lower slab 21a of the precast elements 21; the first ribs 21b
and second ribs 23b are connected to the upper slab 23a by means of the first connecting
reinforcements 21c, second connecting reinforcements 21d and coupling reinforcements
24.
[0021] The floor 20 also comprises adding reinforcements 26 that are placed on site and
embedded within the cast-in-situ concrete 23.
[0022] The method for making the floor 20 is technically equivalent to the above-described
method for making the floor 1.
[0023] It should be understood that the precast elements 21 are made in a factory for the
production of precast elements, on a prestressing bed at which the pre-tensioned prestressing
reinforcements (
inter alia) are placed. A concrete cast is first carried out, with which the lower slab 21a
and said portion of the first ribs 21b are made; this portion of the first ribs 21b
has the extrados arranged at the same level as the intrados of the upper flange 21e,
not yet made; subsequently, after the positioning of the lightweight elements 22a
and of additional reinforcements that then remain embedded in the concrete of the
upper flange 21e, the remaining portion of the first ribs 21b and the upper flange
21e are then made, by means of a further concrete cast. After the concrete has reached
a suitable curing degree, the prestressing forces are applied to the precast elements
21, by shortening the hydraulic stressing jacks arranged at the anchoring heads of
said prestressing bed.
[0024] It should be understood that the upper flange 21e of each precast element 21 is made
before casting the cast-in-situ concrete 23.
[0025] The precast elements 21 are provided with a considerable torsional rigidity which
is given to them by the closed (cross) section formed by the upper flange 21e, by
the two first ribs 21b and by that part of lower slab 21a which is arranged at the
first ribs 21b and is comprised within the outer wires of said two first ribs 21b.
[0026] With reference to Fig. 1-1, 12, 13, 14, 15 and 16 a floor 40 is described with flat
intrados precast elements, which is obtained according to the present invention, according
to another embodiment. This floor 40 is one of the floors of a commercial building.
[0027] The floor 40 40 comprises flat intrados precast elements 41 of prestressed concrete,
flat intrados precast elements 47 of prestressed concrete, lightweight elements 42a,
42b, plates 46 and parts of cast-in-situ concrete 43. Each of the precast elements
41 comprises a lower slab 41a, two first ribs 41b which are arranged above the lower
slab 41a, first connecting reinforcements 41c projecting above the two first ribs
41b and second connecting reinforcements 41d arranged at the longitudinal edges of
the precast element 41, which reinforcements are partially embedded in the concrete
of the lower slab 41a and projecting above the extrados of the lower slab 41a; the
first ribs 41b are made simultaneously with the lower slab 41a.
[0028] Each of the precast elements 47 comprises a lower slab 47a, two first ribs 47b arranged
above the lower slab 47a, first connecting reinforcements 47c which project above
the two first ribs 47b and second connecting reinforcements 47d arranged at the longitudinal
edges of the precast element 47, which reinforcements are partially embedded in the
concrete of the lower slab 47a and projecting above the extrados of the lower slab
47a; the first ribs 47b are made simultaneously with the lower slab 47a. Each precast
element 41 and each precast element 47 is self-bearing during the steps of casting
the cast-in-situ concrete 43. Longitudinal joints 45 are provided between adjoining
precast elements 41; a longitudinal joint 45 is further provided between each precast
element 41 and each precast element 47 adjoining thereto; at each of the longitudinal
joints 45 coupling reinforcements 44 are provided, which comprise transversal parts
arranged proximate to the extrados of the lower slab 41a of said two adjoining precast
elements 41, or of the lower slab 41a and of the lower slab 47a respectively of a
precast element 41 and of a precast element 47 adjoining thereto. The precast elements
47 are placed sequentially and have the longitudinal axes arranged on a same straight
line.
[0029] Said parts of cast-in-situ concrete 43 comprise an upper slab 43a and second ribs
43b arranged at the longitudinal joints 45. At each of the second ribs 43b arranged
between due adjoining precast elements 41, the two adjoining precast elements 41 are
joined to each other by means of the coupling reinforcements 44 and of the second
connecting reinforcements 41d; the second connecting reinforcements 41d projecting
above the extrados of the lower slab 41a and the coupling reinforcements 44 are embedded
in said parts of cast-in-situ concrete 43. At each of the second ribs 43b arranged
between a precast element 41 and a precast element 47 adjoining to each other, the
precast element 41 and the precast element 47 adjoining to each other are joined to
each other by means of the coupling reinforcements 44, of the second connecting reinforcements
41d and of the second connecting reinforcements 47d; the second connecting reinforcements
41d projecting above the extrados of the lower slab 41a, the second connecting reinforcements
47d projecting above the extrados of the lower slab 47a and the coupling reinforcements
44 are embedded in said parts of cast-in-situ concrete 43. The height of the second
ribs 43b is more than twice the height of the lower slab 41a of the precast elements
41 (this thickness is equal to the thickness of the lower slab 47a of the precast
elements 47); the lightweight elements 42a, 42b have the intrados arranged at the
extrados of the lower slab 41a of the precast elements 41. The first ribs 41b, 47b
and the second ribs 43b are connected to the upper slab 43a by means of the first
connecting reinforcements 41c, the second connecting reinforcements 41d, the first
connecting reinforcements 47c, the second connecting reinforcements 47d and the coupling
reinforcements 44.
[0030] The floor 40 also comprises adding reinforcements 52 which comprise bars, meshes
and the coupling reinforcements 44. The adding reinforcements 52 are placed on site
and embedded within the cast-in-situ concrete 43.
[0031] The floor 40 is supported by structural elements 53 each of which consists of a precast
beam of prestressed concrete with inverted T-shaped section;
[0032] The structural elements 53 support both the precast elements 41, 47 during the first
step of the method for making both the floor 40 (see below), and the floor 40 when
the latter has been completed.
[0033] It should be noted that in Fig. 15 and 16, for simplicity of illustration, the relevant
structural element 53 has not been shown.
[0034] The floor 40 further comprises the plates 46, with a function of disposable formwork,
which are sequentially arranged at the precast elements 47. It should be noted that
in Fig. 11 only some of the plates 46 are shown. It should be also noted that in Fig.
16 one of the plates 46 is also illustrated.
[0035] With reference to each of the precast elements 47 the following is pointed out: each
of the plates 46 arranged at said precast element 47 is positioned, with the ends
thereof, at the extrados of the two first ribs 47b; the intrados of the plates 46,
the two adjacent faces of the two first ribs 47b and the intrados of that part of
the lower slab 47a which is comprised between said two first ribs 47b define a channel
48, which is arranged within the floor 40; the channel 48 results to be accessible
through openings 49 provided in the lower slab 47a in the part comprised between the
two first ribs 47b; the openings 49 provided in the lower slab 47a are closed by means
of closure elements 51 made of sheet steel and placed at sheet steel frames 50 each
of which is arranged on the perimeter of the corresponding opening 49. It should be
noted that, in each of the precast elements 47 the channel 48 can be normally used
for passing tubing or installations therein; the channel 48 may also be normally used
as channeling for the conditioning system; in this case, in addition to the openings
49 also other openings are provided in which diffuser elements (outlets) are placed
for venting the air treated by the channel 48. It is understood that, depending on
the different cases and conditions, it is required that the structural elements 53
supporting the floor 40 are provided with the holes that are required for providing
the communication between the channels 48 that are provided in the several precast
elements 47.
[0036] The method for making the floor 40 is technically equivalent to the method for making
the floor 1 as described above.
[0037] It should be understood that during the second step of the method for making the
floor 40, at each precast element 47, the plates 46 are placed which have the function
of disposable formwork. With reference to each of the precast elements 47 it should
be pointed out that: each of the plates 46 is positioned with the ends thereof on
the extrados of the two first ribs 47b; the intrados of the plates 46, the two adjacent
faces of the two first ribs 47b and the intrados of that part of the lower slab 47a
which is comprised between said two first ribs 47b define the channel 48.
[0038] The casting of the cast-in-situ concrete 43 is then carried out.
[0039] Generally, the precast elements comprised in a floor obtained according to the present
invention can be provided with more than two first ribs; it should be noted that two
first ribs are normally used.
[0040] A floor with flat intrados precast elements obtained according to the present invention
can be supported by precast I-shaped, inversed T-shaped, etc., beams of prestressed
concrete, or can be supported by mixed lattice beams of steel and concrete, or can
be supported by concrete beams made on site.
[0041] It should be understood that in a floor with flat intrados precast elements obtained
according to the present invention each of the precast elements can be positioned
on the beam even using a cantilever support.
[0042] The lightweight elements, such as the lightweight elements 3a, 3b, are preferably
placed at the extrados of the lower slab of the precast elements when the concrete
with which the precast element has been made is still wet. Alternatively, these lightweight
elements can be placed after the precast elements have been made, however paying attention
to join, using means, the lightweight elements to the precast elements.
[0043] The lightweight elements comprised in a floor with flat intrados precast elements
can also be made using, in addition to foamed polystyrene, other suitable materials.
[0044] It should be understood that in the present disclosure and in the drawings attached
thereto, the lift inserts, which are provided in the precast elements comprised in
the floors as obtained according to the present invention, as well as the inserts
for venting the gases that can be originated from the lightweight elements in case
of fire are not shown.
[0045] The flat intrados precast elements used in the floors obtained according to the present
invention are normally made of prestressed concrete by means of adhering pre-tensioned
strands; it is however possible that flat intrados precast elements used in the floors
obtained according to the present invention are made of reinforced concrete.
[0046] It should be understood that a floor with intrados precast elements obtained according
to the present invention can also have considerable heights since the precast elements
(that are comprised therein) may have considerable heights and since that the upper
slab of cast-in-situ concrete may, depending on the case and as required, also have
great thicknesses.
[0047] The floors with flat intrados precast elements obtained according to the present
invention can be used for making floors and generally joints of an office building,
a residential building, a commercial building, a parking building, a sports building,
etc.. The floors with flat intrados precast elements obtained according to the present
invention can be also advantageously used as covering floors for buildings in general.
The floors with flat intrados precast elements obtained according to the present invention
can be also used even in the presence of large spans and/or loads, and particularly
in the presence of loads deriving from the transit of vehicles.
[0048] An advantage of the present invention is that the precast elements comprised in a
floor (as obtained according to the present invention) are self-bearing and allow
avoiding expensive strutting on site.
[0049] A further advantage of the present invention is that the normal placement on site
of the precast elements (comprised in a floor with flat intrados precast elements
(as obtained according to the present invention) and the subsequent step of casting
the cast-in-situ concrete, result to be sufficiently quick and easy.
[0050] A further advantage of the present invention is that a floor (as obtained according
to the present invention) is provided with a small value of heat transmission rate.
[0051] A further advantage of the present invention is that the strains of a floor with
flat intrados precast elements (as obtained according to the present invention) are
normally of a small extent.
[0052] A further advantage of the present invention is that a floor with flat intrados precast
elements (as obtained according to the present invention) can be considered to be
sufficiently light, if the performance thereof are duly taken into account.
1. A method for making a floor with flat intrados precast elements comprising the following
steps:
- first step: concrete precast elements (2, 21, 41, 47) are placed on site, which
had been previously made in a factory for the production of precast elements; said
precast elements (2, 21, 41, 47) are placed by positioning them with the ends thereof
on structural elements (8, 53) which support the floor (1, 20, 40); each precast element
(2, 21, 41, 47) has a flat intrados and is self-bearing during the steps of casting
the cast-in-situ concrete (4, 23, 43); each of said precast elements (2, 21, 41, 47)
comprises a lower slab (2a, 21a, 41a, 47a), first ribs (2b, 21b, 41b, 47b) arranged
above said lower slab (2a, 21a, 41a, 47a), first connecting reinforcements (2c, 21c,
41c, 47c) projecting above said first ribs (2b, 21b, 41b, 47b) and second connecting
reinforcements (2d, 21d, 41d, 47d) arranged at the longitudinal edges of said precast
element (2, 21, 41, 47), which reinforcements are partially embedded in the concrete
of the lower slab (2a, 21a, 41a, 47a) and projecting above the extrados of said lower
slab; at least one portion of each of said first ribs (2b, 21b, 41b, 47b) has been
made simultaneously with said lower slab (2a, 21a, 41a, 47a); at the end of the first
step of the method each of said precast elements (2, 21, 41, 47) is supported with
the ends thereof at said load-bearing structural elements (8, 53); at the extrados
of the lower slab (2a, 21a, 41a, 47a) of said precast elements (2, 21, 41, 47) lightweight
elements (3a, 3b, 22a, 22b, 42a, 42b) are placed; the precast elements (2, 21, 41,
47) are placed next to each other, so that longitudinal joints (6, 25, 45) are provided
between adjoining precast elements (2, 21, 41, 47);
- second step: the adding reinforcements (10, 26, 52) are placed; said adding reinforcements
(10, 26, 52) also comprise transversal coupling reinforcements (5, 24, 44) which are
placed at said longitudinal joints (6, 25, 45) between two adjoining precast elements
(2, 21, 41, 47); said coupling reinforcements (5, 24, 44) comprise transversal parts
arranged proximate to the extrados of the lower slab (2a, 21a, 41a, 47a) of said adjoining
precast elements (2, 21, 41, 47);
- third step: the casting of concrete (4, 23, 43) is carried out on site thereby making
an upper slab (4a, 23a, 43a) and second ribs (4b, 23b, 43b); said second ribs (4b,
23b, 43b) are arranged at the longitudinal joints (6, 25, 45) between two adjoining
precast elements (2, 21, 41, 47); at each of said second ribs (4b, 23b, 43b) the two
adjoining precast elements (2, 21, 41, 47) are joined to each other by means of said
coupling reinforcements (5, 24, 44) and of said second connecting reinforcements (2d,
21d, 41d, 47d); said second connecting reinforcements (2d, 21d, 41d, 47d) projecting
above the extrados of the lower slab (2a, 21a, 41a, 47a) and said coupling reinforcements
(5, 24, 44) are embedded in the cast-in-situ concrete (4, 23, 43); at the end of said
third step of the method, after the cast-in-situ concrete (4, 23, 43) has suitably
cured, the first ribs (2b, 21b, 41b, 47b) and the second ribs (4b, 23b, 43b) are connected
to the upper slab (4a, 23a, 43a) by means of the first connecting reinforcements (2c,
21c, 41c, 47c), the second connecting reinforcements (2d, 21d, 41d, 47d) and the coupling
reinforcements (5, 24, 44);
- the second ribs (4b, 23b, 43b) are created through the pouring of concrete on site
between lightweight elements (3a, 3b, 22a, 22b, 42a, 42b) positioned on adjacent precast
elements (2, 21, 41, 47), so that the second ribs (4b, 23b, 43b) are in direct contact
with said lightweight elements.
2. The method according to claim 1 wherein during the second step of said method, at
one or more precast elements (47), plates (46) are placed which have the function
of disposable formwork; in each of said one or more precast elements (47), each of
the plates (46) is positioned at the extrados of two adjoining first ribs (47b); the
intrados of the plates (46), the two adjacent faces of the two first ribs (47b) and
the intrados of that part of lower slab (47a) which is comprised between said adjoining
two first ribs (47b), define a channel (48).
3. A floor with flat intrados precast elements as obtained according to the method of
claim 1, comprising concrete flat intrados precast elements (2, 21, 41, 47), lightweight
elements (3a, 3b, 22a, 22b, 42a, 42b) and parts of cast-in-situ concrete (4, 23, 43),
each of said precast elements (2, 21, 41, 47) comprises a lower slab (2a, 21a, 41a,
47a), first ribs (2b, 21b, 41b, 47b) placed above said lower slab (2a, 21a, 41a, 47a),
first connecting reinforcements (2c, 21c, 41c, 47c) projecting above said first ribs
(2b, 21b, 41b, 47b) and second connecting reinforcements (2d, 21d, 41d, 47d) placed
at the longitudinal edges of said precast element (2, 21, 41, 47), which reinforcements
are partially embedded in the concrete of the lower slab (2a, 21a, 41a, 47a) and projecting
above the extrados of said lower slab; at least one portion of each of said first
ribs (2b, 21b, 41b, 47b) is made simultaneously with said lower slab (2a, 21a, 41a,
47a); each precast element (2, 21, 41, 47) is self-bearing during the casting of said
cast-in-situ concrete (4, 23, 43); the precast elements (2, 21, 41, 47) are placed
next to each other so that longitudinal joints (6, 25, 45) are provided between adjoining
precast elements (2, 21, 41, 47); at each of said longitudinal joints (6, 25, 45)
between two adjoining precast elements (2, 21, 41, 47) coupling reinforcements (5,
24, 44) are provided which comprise transversal parts placed proximate to the extrados
of the lower slab (2a, 21a, 41a, 47a) of said adjoining precast elements (2, 21, 41,
47); said parts of cast-in-situ concrete (4, 23, 43) comprise an upper slab (4a, 23a,
43a) and second ribs (4b, 23b, 43b) arranged at the longitudinal joints (6, 25, 45)
between the adjoining precast elements (2, 21, 41, 47); at each of said second ribs
(4b, 23b, 43b) the two adjoining precast elements (2, 21, 41, 47) are joined to each
other by means of said coupling reinforcements (5, 24, 44) and of said second connecting
reinforcements (2d, 21d, 41d, 47d); said second connecting reinforcements (2d, 21d,
41d, 47d) projecting above the extrados of the lower slab (2a, 21a, 41a, 47a) and
said coupling reinforcements (5, 24, 44) are embedded in said parts of cast-in-situ
concrete (4, 23, 43); the lightweight elements (3a, 3b, 22a, 22b, 42a, 42b) have the
intrados positioned at the extrados of the lower slab (2a, 21a, 41a, 47a) of the precast
elements (2, 21, 41, 47); said first ribs (2b, 21b, 41b, 47b) and said second ribs
(4b, 23b, 43b) are connected to the upper slab (4a, 23a , 43a) by means of the first
connecting reinforcements (2c, 21c, 41c, 47c), second connecting reinforcements (2d,
21d, 41d, 47d) and coupling reinforcements (5, 24, 44) the second ribs (4b, 23b, 43b)
are between lightweight elements (3a, 3b, 22a, 22b, 42a, 42b) positioned on adjacent
precast elements (2, 21, 41, 47), and the second ribs (4b, 23b, 43b) are in direct
contact with said lightweight elements.
4. The floor with flat intrados precast elements according to claim 3, wherein the height
of the second ribs (4b, 23b, 43b) is more than twice the height of the lower slab
(2a, 21a, 41a, 47a) of said precast elements (2, 21, 41, 47).
5. The floor with flat intrados precast elements according to claim 3, wherein each precast
element (21) also comprises an upper flange (21e) integral with the upper ends of
two of the first ribs (21b); said upper flange (21e) is made before casting the cast-in-situ
concrete (23).
6. The floor with flat intrados precast elements according to claim 3 wherein each of
the precast elements (2, 21, 41, 47) comprises two first ribs (2b, 21b, 41b, 47b).
7. The floor with flat intrados precast elements according to claim 3 wherein it comprises
at least one or more plates (46) having the function of disposable formwork, which
are positioned at one or more precast elements (47); in each of said one or more precast
elements (47), each of the one ore more plates (46) arranged at said precast element
(47) is positioned with the ends thereof on the extrados of two adjoining first ribs
(47b); the intrados of said plates (46), the two adjacent faces of said two adjoining
first ribs (47b) and the intrados of that part of lower slab (47a) which is comprised
between said two adjoining first ribs (47b) define a channel (48), which is arranged
within the deck (40); said channel (48) results to be accessible through openings
(49) that are provided in said lower slab (47a) in that part which is comprised between
said two first ribs (47b).
8. The floor with flat intrados precast elements according to claim 3 wherein in each
precast element (2, 21, 41, 47) the first ribs (2b, 21b, 41b, 47b) comprise joining
elements (7) therebelow, which connect said first ribs to the lower slab (2a, 21a,
41a, 47a).
9. The floor with flat intrados precast elements according to claim 3 wherein each precast
element (2, 21, 41, 47) is prestressed by means of pre-tensioned adhering strands
(11).
1. Verfahren zur Herstellung eines Fussbodens mit vorgefertigten Elementen mit flacher
inneren Oberfläche, folgende Schritte umfassend:
- erster Schritt: vorgefertigte Betonelemente (2, 21, 41, 47) werden vor Ort positioniert,
nachdem sie zuvor in einer Fabrik für die Herstellung von vorgefertigten Elementen
erzeugt worden sind; wobei die besagten vorgefertigten Elemente (2, 21, 41, 47) derart
positioniert werden, dass sie mit ihren Enden auf Bauelementen (8, 53) platziert werden,
die den Fussboden (1, 20, 40) unterstützen; wobei jedes vorgefertigtes Element (2,
21, 41, 47) eine flache innere Oberfläche aufweist und selbsttragend während der Schritte
von Gießen von Ort des Betons (4, 23, 43) ist; wobei jedes der besagten vorgefertigten
Elemente (2, 21, 41, 47) eine untere Platte (2a, 21a, 41a, 47a) aufweist, erste Rippen
(2b, 21b, 41b, 47b) über der besagten unteren Platte (2a, 21a, 41a, 47a) angeordnet
sind, erste Verstärkungsverbindungen (2c, 21c, 41c, 47c) über die besagten ersten
vorstehenden Rippen (2b, 21b, 41b, 47b) vorstehen und zweite Verbindungsverstärkungen
(2d, 21d, 41d, 47d) an den Längskanten der besagten vorgefertigten Elemente (2, 21,
41, 47) angeordnet sind, wobei die besagten Verstärkungen teilweise in den Beton der
unteren Patte (2a, 21a, 41a, 47a) eingebettet sind und oberhalb der äußeren Oberfläche
der besagten unteren Platte auskragen; wobei mindestens ein Teil von jeder der besagten
ersten Rippen (2b, 21b, 41b, 47b) gleichzeitig mit der besagten unteren Platte (2a,
21a, 41a, 47a) gefertigt worden ist; am Ende des ersten Schrittes des Verfahrens,
ist jedes der besagten vorgefertigten Elemente (2, 21, 41, 47) mit seinen Enden bei
den besagten lasttragenden Bauelemente (8; 53) unterstützt; bei der äußeren Oberfläche
der unteren Platten (2a, 21a, 41a, 47a) der besagten vorgefertigten Elemente (2, 21,
41, 47) Leichtelemente (3a, 3b, 22a, 22b, 42a, 42b) angeordnet sind; die vorgefertigten
Elemente (2, 21, 41, 47) nebeneinander derart positioniert sind, dass Längsverbindungen
(6, 25, 45) zwischen angrenzenden vorgefertigten Elementen (2, 21, 41, 47) ausgebildet
sind,
- zweiter Schritt: weitere Verstärkungen (10, 26, 52) werden hinzugefügt, wobei die
besagten hinzugefügten Verstärkungen (10, 26, 52) auch Querverbindungsverstärkungen
(5, 24, 44) aufweisen, die in der Nähe der besagten Längsverbindungen (6, 25, 45)
zwischen zwei angrenzenden vorgefertigten Elementen (2, 21, 41, 47) aufgenommen sind;
wobei die besagten Verbindungsverstärkungen (5, 24, 44) Querteile umfassen, die in
der Nähe der äußeren Oberfläche der unteren Platte (2a, 21a, 41a, 47a) der besagten
vorgefertigten Elemente (2, 21, 41, 47) angeordnet ist;
- dritter Schritt: das Gießen des Betons (4, 23, 43) vor Ort geschieht, wobei eine
obere Platte (4a, 23a, 43a) und zweite Rippen (4b, 23b, 43b) gefertigt werden; wobei
die besagten zweiten Rippen (4b, 23b, 43b) bei den Längsverbindungen (6, 25 45,) zwischen
zwei angrenzenden vorgefertigten Elementen (2, 21, 41, 47) platziert sind; bei jeder
der besagten zweiten Rippen (4b, 23b, 43b) werden die beiden angrenzenden vorgefertigten
Elemente (2, 21, 41, 47) miteinander verbunden, durch die besagten Kupplungsverstärkungen
(5, 24, 44) und der besagten zweiten Verbindungsverstärkungen (2d, 21d, 41d, 47d);
wobei die besagten zweiten Verbindungsverstärkungen (2d, 21d, 41d, 47d) über der äußeren
Oberfläche der unteren Platte (2a, 21a, 41a, 47a) vorstehen und die besagten Kupplungsverstärkungen
(5, 24, 44) in den vor Ort gegossenen Beton (4, 23, 43) eingebettet sind; am Ende
des besagten dritten Schrittes des Verfahrens, nachdem der vor Ort gegossener Beton
(4, 23, 43) sich in geeigneter Weise verfestigt ist, werden die ersten Rippen (2b,
21b, 41b, 47b) und die zweiten Rippen (4b, 23b, 43b) mit der oberen Platte (4a, 23a,
43a) mittels der ersten Verbindungsverstärkungen (2c, 21c, 41c, 47c), der zweiten
Verbindungsverstärkungen (2d, 21d, 41d, 47d) und der Kupplungsverstärkungen (5, 24,
44) verbunden;
- die zweiten Rippen (4b, 23b, 43b) werden durch Gießen des Betons an Ort und Stelle
zwischen Leichtelementen (3a, 3b, 22a, 22b, 42a, 42b) gefertigt, die auf benachbarten
vorgefertigten Elementen (2, 21, 41, 47) derart positioniert sind, dass die besagten
zweiten Rippen (4b, 23b, 43b) in direktem Kontakt mit der genannten Leichtelemente
sind.
2. Verfahren nach Anspruch 1, bei dem während des zweiten Schrittes des besagten Verfahrens,
bei einem oder mehreren vorgefertigten Elementen (47) Platten (46) platziert sind,
die die Funktion einer Einwegstruktur besitzen; wobei in jeder der besagten einen
oder mehreren vorgefertigten Elemente (47), ist jede der Platten (46) auf der äußeren
Oberfläche von zwei ersten angrenzenden Rippen (47b) angeordnet; die innere Oberfläche
der Platten (46), die zwei benachbarten Oberflächen der beiden ersten Rippen (47b)
und die innere Oberfläche jenes Teils der unteren Platte (47 a), die zwischen den
genannten zwei ersten Rippen (47b) angeordnet ist, definiert einen Kanal (48).
3. Fussboden mit vorgefertigten Elementen mit flacher inneren Oberfläche gemäß dem Verfahren
von Anspruch 1 erhalten, vorgefertigte Betonelemente (2, 21, 41, 47) mit flacher inneren
Oberfläche umfassend, Leichtelemente (3a, 3b, 22a, 22b, 42a, 42b) und Teile von vor
Ort gegossenen Beton (4, 23, 43), wobei jedes der besagten vorgefertigten Elemente
(2, 21, 41, 47) eine untere Platte (2a, 21a, 41a, 47a) aufweist, erste Rippen (2b,
21b, 41b, die auf der besagten unteren Platte (2a, 21a, 41a, 47a) angeordnet sind,
erste Verbindungsverstärkungen (2c, 21c, 41c, 47c) die über die besagten ersten Rippen
(2b, 21b, 41b, 47b) vorstehen, und zweite Verbindungsverstärkungen (2d, 21d, 41d,
47d) an den Längskanten des besagten vorgefertigten Elements (2, 21, 41, 47) angeordnet
sind, wobei die besagten Verstärkungen teilweise in den Beton der unteren Platte (2a,
21a, 41a, 47a) eingebettet sind und über der äußeren Oberfläche der besagten unteren
Platte vorstehen; wobei zumindest ein Teil von jeder der besagten ersten Rippen (2b,
21b, 41b, 47b) gleichzeitig mit dem besagten unteren Platte (2a, 21a, 41a, 47a) gefertigt
ist; wobei jedes vorgefertigtes Element (2, 21, 41, 47) selbsttragend beim Gießen
des besagten vor Ort gegossenen Betons (4, 23, 43) ist; wobei die vorgefertigten Elemente
(2, 21, 41, 47) nebeneinander derart platziert sind, dass Längsverbindungen (6, 25,
45) zwischen angrenzenden vorgefertigten Elementen (2, 21, 41, 47) ausgebildet sind;
wobei bei jedem der besagten Längsverbindungen (6, 25, 45) zwischen zwei angrenzenden
vorgefertigten Elementen (2, 21, 41, 47) Kupplungsverstärkungen (5, 24, 44) vorgesehen
sind, die Querteile umfassen, die in der Nähe des äußeren Oberfläche der unteren Platte
(2a, 21a, 41a, 47a) der besagten vorgefertigten Elemente (2, 21, 41, 47) angeordnet
sind; wobei die besagten Teile des vor ort gegossenen Betons (4, 23, 43) eine obere
Platte (4a, 23a, 43a) und zweite Rippen (4b, 23b, 43b) umfassen, die bei den Längsverbindungsstellen
(6, 25, 45) zwischen den angrenzenden vorgefertigten Elementen (2, 21, 41, 47) angeordnet
sind; bei jeder der besagten zweiten Rippen (4b, 23b, 43b) sind die beiden vorgefertigten
benachbarten Elemente (2, 21, 41, 47) miteinander mittels der besagten Kupplungsverstärkungen
(5, 24, 44) und der besagten Verbindungsverstärkungen (2d, 21d, 41d, 47d) verbunden
wobei die besagten zweiten Verbindungsverstärkungen (2d, 21d, 41d, 47d) über die äußere
Oberfläche der unteren Platte (2a, 21a, 41a, 47a) vorstehen und die besagten Verbindungsverstärkungen
(5, 24, 44) in den besagten Teilen des vor Ort gegossenen Betons (4, 23, 43) eingebettet
sind; wobei die Leichtelemente (3a, 3b, 22a, 22b, 42a, 42b) die innere Oberfläche
aufweisen, die bei der äußeren Oberfläche der unteren Patte (2a, 21a, 41a, 47a) der
vorgefertigten Elemente (2, 21, 41, 47) positioniert sind; wobei die besagten ersten
Rippen (2b, 21b, 41b, 47b) und die besagten zweiten Rippen (4b, 23b, 43b) mit der
oberen Platte (4a, 23a, 43a) durch die erste Verbindungverstärkungen (2c, 21c, 41c,
47c), zweite Verbindungsverstärkungen (2d, 21d, 41d, 47d) und Kupplungsverstärkungen
(5, 24, 44), verbunden sind,
wobei die zweiten Rippen (4b, 23b, 43b) zwischen den Leichtelementen (3a, 3b, 22a,
22b, 42a, 42b) auf vorgefertigten benachbarten Elementen (2, 21, 41, 47) positioniert
sind, und die zweiten Rippen (4b, 23b, 43b) in direktem Kontakt mit der besagten Leichtelementen
sind.
4. Fussboden mit vorgefertigten Elementen mit flacher inneren Oberfläche nach Anspruch
3, wobei die Höhe der zweiten Rippen (4b, 23b, 43b) grösser als das Doppelte der Höhe
der unteren Platte (2a, 21a, 4a, 47a) der besagten vorgefertigten Elemente (2, 21,
41, 47) ist.
5. Fussboden mit vorgefertigten Elementen mit flacher inneren Oberfläche nach Anspruch
3, wobei jedes vorgefertigtes Element (21) auch einen oberen Flansch (21e) aufweist,
der integral mit den oberen Enden von zwei der ersten Rippen (21b) ist; wobei der
besagte obere Flansch (21e) vor dem Gießen vor Ort des Betons (23) gefertigt wird.
6. Fussboden mit vorgefertigten Elementen mit flacher inneren Oberfläche nach Anspruch
3, wobei jedes der vorgefertigten Elemente (2, 21, 41, 47) zwei ersten Rippen (2b,
21b, 41b, 47b) umfasst.
7. Fussboden mit vorgefertigten Elementen mit flacher inneren Oberfläche nach Anspruch
3, wobei er mindestens eine oder mehrere Platten (46) umfasst, die die Funktion eines
Einwegprofils ausüben und welche in Übereinstimmung mit einem oder mehreren vorgefertigten
Elementen (47) positioniert sind; wobei in jeder der einen oder mehreren vorgefertigten
Elemente (47), jeder der einen oder mehreren Platten (46) am besagten vorgefertigten
Element (47) mit den Enden auf der äußeren Oberfläche von zwei ersten Rippen (47b)
angeordnet ist; wobei die innere Oberfläche der besagten Platten (46), die zwei benachbarten
Oberflächen der genannten zwei ersten Rippen (47b) und angrenzend an die innere Oberfläche
des Teils der unteren Platte (47a), der zwischen den besagten ersten benachbarten
Rippen (47b) angeordnet ist, einen Kanal (48) definiert, der innerhalb der Abdeckung
(40) angeordnet ist; wobei der besagte Kanal (48) durch Öffnungen (49) zugänglich
ist, die in der besagten oberen Platte (47a) in dem Teil vorgesehen sind, der zwischen
den besagten ersten Rippen (47b) angeordnet ist.
8. Fussboden mit vorgefertigten Elementen mit flacher inneren Oberfläche nach Anspruch
3, wobei in jedem vorgefertigten Element (2, 21, 41, 47) die ersten Rippen (2b, 21b,
41b, 47b) Verbindungselemente (7) unter diesen aufweisen, die die besagten ersten
Rippen mit der unteren Platte (2a, 21a, 41a, 47a) verbinden.
9. Fussboden mit vorgefertigten Elementen mit flacher inneren Oberfläche nach Anspruch
3, wobei jedes vorgefertigtes Element (2, 21, 41, 47) durch vorgespannte Haftstreifen
(11) vorgespannt ist.
1. Procédé de fabrication d'un plancher avec des éléments préfabriqués à intrados plat,
comprenant les opérations suivantes:
- première opération: des éléments préfabriqués en béton (2, 21, 41, 47) sont placés
sur place, après avoir été produits auparavant dans une usine pour la production d'éléments
préfabriqués; lesdits éléments préfabriqués (2, 21, 41, 47) sont placés au moyen d'un
positionnement avec leur extrémités sur des éléments de structure (8, 53) qui soutiennent
le plancher (1, 20 , 40); chaque élément préfabriqué (2, 21, 41, 47) a un intrados
plat et est auto-supportant pendant les opérations de coulage de béton (4, 23, 43)
coulé sur place; chacun desdits éléments préfabriqués (2, 21, 41, 47) comprend une
plaque inférieure (2a, 21a, 41a, 47a), premières nervures (2b, 21b, 41b, 47b) disposées
au-dessus de ladite plaque inférieure (2a, 21a, 41a, 47a), premiers renforts de connexion
(2c, 21c, 41c, 47c) faisant saillie au-dessus desdites premières nervures (2b, 21b,
41b, 47b) et deuxièmes renforts de connexion (2d, 21d, 41d, 47d) sont disposés sur
les bords longitudinaux dudit éléments préfabriqué (2, 21, 41, 47), les renforts étant
partiellement noyés dans le béton de la plaque inférieure (2a, 21a, 41a, 47a) et faisant
saillie sur l'extrados de ladite plaque inférieure; au moins une partie de chacune
desdites premières nervures (2b, 21b, 41b, 47b) a été produite en même temps que ladite
plaque inférieure (2a, 21a, 41a, 47a); à la fin de la première opération du procédé,
chacun desdits éléments préfabriqués (2, 21, 41, 47) est supporté avec ses extrémités
aux dits éléments structurels (8; 53) qui supportent les charges; sur l'extrados de
la plaque inférieure (2a, 21a, 41a, 47a) desdits éléments préfabriqués (2, 21, 41,
47) sont placés des éléments légers (3a, 3b, 22a, 22b, 42a, 42b); les éléments préfabriqués
(2, 21, 41, 47) sont placés l'un à côté de l'autre, et des jonctions longitudinales
(6, 25, 45) sont formées entre des éléments préfabriqués (2, 21, 41, 47) adjacents;
- deuxième opération: les renforts ajoutés (10, 26, 52) sont placés; lesdits renforts
ajoutés (10, 26, 52) comprennent également un couplage transversal des renforts (5,
24, 44) qui sont situés près desdites jonctions longitudinales (6, 25, 45) entre deux
éléments préfabriqués (2, 21, 41, 47) ajoutés; lesdits renforts de couplage (5, 24,
44) comprennent des parties transversales disposées an proximité de l'extrados de
la plaque inférieure (2a, 21a, 41a, 47a) desdits éléments préfabriqués (2, 21, 41,
47) adjacents;
- troisième opération: la coulée de béton (4, 23, 43) est réalisée en produisant sur
place dans un tel cas une plaque supérieure (4a, 23a, 43a) et deuxièmes nervures (4b,
23b, 43b); lesdites deuxièmes nervures (4b, 23b, 43b) sont disposés près des jonctions
longitudinales (6, 25, 45) entre deux éléments préfabriqués (2, 21, 41, 47) ajoutés;
en correspondance avec chacune desdites deuxièmes nervures (4b, 23b, 43b) les deux
éléments préfabriqués (2, 21, 41, 47) adjacents sont reliés les uns aux autres par
des moyens de couplage desdits renforts de couplage (5, 24, 44) et desdits deuxièmes
renforts de connexion (2d, 21d, 41d, 47d); lesdits deuxièmes renforts de connexion
(2d, 21d, 41d, 47d) font saillie au-dessus de l'extrados de la plaque inférieure (2a,
21a, 41a, 47a) et lesdits renforts de couplage (5, 24, 44) sont noyées dans le béton
(4, 23, 43) coulé sur place; à la fin de ladite troisième opération du procédé, après
que le béton (4, 23, 43) a été coulé sur place est s'est consolide d'une manière appropriée,
les premières nervures (2b, 21b, 41b, 47b) et les deuxièmes nervures (4b, 23b, 43b)
sont reliés à la plaque supérieure (4a, 23a, 43a) par les premières renforts de couplage
(2c, 21c, 41c, 47c), les deuxièmes renforts de connexion (2d, 21d, 41d, 47d) et les
renforts de couplage (5, 24, 44);
- les deuxièmes nervures (4b, 23b, 43b) sont créés par la coulée du béton sur place
entre les éléments légers (3a, 3b, 22a, 22b, 42a, 42b) positionnés sur des éléments
préfabriqués adjacents (2, 21, 41, 47), de manière que les deuxièmes nervures (4b,
23b, 43b) sont en contact direct avec lesdits éléments légers.
2. Procédé selon la revendication 1, dans lequel au cours de la deuxième opération dudit
procédé, près d'un ou plusieurs éléments préfabriqués (47), sont placées des plaques
(46) qui ont la fonction d'un travail de formation à perdre ; dans chacun desdits
un ou plusieurs éléments préfabriqués (47), chacune des plaques (46) est positionnée
sur l'extrados des deux premières nervures (47b) adjacentes; l'intrados des plaques
(46), les deux faces adjacentes des deux premières nervures (47b) et l'intrados de
celle partie de la plaque inférieure (47 a) qui est comprise entre lesdites deux premières
nervures (47b) adjacentes, définit un canal (48).
3. Plancher avec des éléments préfabriqués a intrados plat obtenu selon le procédé de
la revendication 1, comprenant des éléments préfabriqués (2, 21, 41, 47) à intrados
plat de béton, des éléments légers (3a, 3b, 22a, 22b, 42a, 42b) et des parties de
béton (4, 23, 43) coulé sur place, chacun desdits éléments préfabriqués (2, 21, 41,
47) comprenant une plaque inférieure (2a, 21a, 41a, 47a), des premières nervures (2b,
21b, 41b, 47b) placées au-dessus de ladite plaque inférieure (2a, 21a, 41a, 47a),
des premiers renforts de connexion (2c, 21c, 41c, 47c) faisant saillie au-dessus desdites
premières nervures (2b, 21b, 41b, 47b) et deuxièmes renforts de connexion (2d, 21d,
41d, 47d) placés sur les bords longitudinaux dudit élément préfabriqué (2, 21, 41,
47), lesdits renforts étant partiellement noyées dans le béton de la plaque inférieure
(2a, 21a, 41a, 47a) et faisant saillie au-dessus de l'extrados de ladite plaque inférieure;
au moins une partie de chacune desdites premières nervures (2b, 21b, 41b, 47b) est
formée simultanément avec ladite plaque inférieure (2a, 21a, 41a, 47a); chaque élément
préfabriqué (2, 21, 41, 47) est autoportant lors de la coulée dudit béton (4, 23,
43) sur place; les éléments préfabriqués (2, 21, 41, 47) sont placés l'un à côté de
l'autre, de mesure que sont formées de jonctions longitudinales (6, 25, 45) entre
des éléments préfabriqués (2, 21, 41, 47) ajoutés; près de chacune desdites jonctions
longitudinales (6, 25, 45) entre deux éléments préfabriqués ajoutés (2, 21, 41, 47)
sont disposés des renforts de couplage (5, 24, 44) qui comprennent des parties transversales
disposées en proximité de l'extrados de la plaque inférieure (2a, 21a, 41a, 47a) desdits
éléments préfabriqués (2, 21, 41, 47) ajoutés; lesdites parties de béton (4, 23, 43)
coulé sur place comprennent une plaque supérieure (4a, 23a, 43a) et deuxièmes nervures
(4b, 23b, 43b) disposées près des jonctions longitudinales (6, 25, 45) entre les éléments
préfabriqués (2, 21, 41, 47) adjacents; près de chacune desdites deuxièmes nervures
(4b, 23b, 43b) les deux éléments préfabriqués (2, 21, 41, 47) adjacents sont reliés
les uns aux autres par lesdits renforts de couplage (5, 24, 44) et lesdits deuxièmes
renforts de connexion (2d, 21d, 41d, 47d); lesdits deuxièmes renforts de connexion
(2d, 21d, 41d, 47d) faisant saillie au-dessus de l'extrados de la plaque inférieure
(2a, 21a, 41a, 47a) et lesdits renforts de couplage (5, 24, 44) sont noyés dans lesdites
parties de béton (4, 23, 43) coulé sur place; les éléments légers (3a, 3b, 22a, 22b,
42a, 42b) ont l'intrados positionné en correspondance de l'extrados de la plaque inférieure
(2a, 21a, 41a, 47a) des éléments préfabriqués (2, 21, 41, 47); lesdites premières
nervures (2b, 21b, 41b, 47b) et lesdites deuxièmes nervures (4b, 23b, 43b) sont reliés
à la plaque supérieure (4a, 23a, 43a) par l'intermédiaire des premiers renforts de
connexion (2c, 21c, 41c, 47c ), des deuxièmes renforts de connexion (2d, 21d, 41d,
47d) et des renforts de couplage (5, 24, 44)
les deuxièmes nervures (4b, 23b, 43b) sont disposées entre les éléments légers (3a,
3b, 22a, 22b, 42a, 42b) positionnés sur des éléments préfabriqués (2, 21, 41, 47)
adjacents, et les deuxièmes nervures (4b, 23b, 43b) sont en contact direct avec lesdits
éléments légers.
4. Plancher avec des éléments préfabriqués à intrados plat selon la revendication 3,
dans lequel la hauteur des deuxièmes nervures (4b, 23b, 43b) est plus du double de
la hauteur de la plaque inférieure (2a, 21a, 4a, 47a) desdits éléments préfabriqués
(2, 21, 41, 47).
5. Plancher aves des éléments préfabriqués à intrados plat selon la revendication 3,
dans lequel chaque élément préfabriqué (21) comprend en outre une bride supérieure
(21e) solidaire des extrémités supérieures de deux des premières nervures (21b); ladite
bride supérieure (21e) est formée avant de couler le béton (23) sur place.
6. Plancher avec des éléments préfabriqués à intrados plat selon la revendication 3,
dans lequel chacun des éléments préfabriqués (2, 21, 41, 47) comprend deux premières
nervures (2b, 21b, 41b, 47b).
7. Plancher avec des éléments préfabriqués à intrados plat selon la revendication 3,
dans lequel il comprend au moins une ou plusieurs plaques (46) ayant la fonction d'une
structure profilée à perdre, qui sont positionnés en correspondance d'un ou plusieurs
éléments préfabriqués (47); dans chacun desdits un ou plusieurs éléments préfabriqués
(47), chacune des une ou plusieurs plaques (46) disposées au niveau desdits éléments
préfabriqués (47) est positionné avec les extrémités de celui-ci sur l'extrados des
deux premières nervures (47b) adjacentes; l'intrados desdites plaques (46), les deux
faces adjacentes desdites deux premières nervures (47b) adjacentes et l'intrados de
celle partie de la plaque inférieure (47a) qui est comprise entre lesdites deux premières
nervures (47b) adjacentes, définissent un canal (48), qui est disposé à l'intérieur
du couvercle (40); ledit canal (48) est accessible à travers des ouvertures (49) qui
sont formées dans ladite plaque supérieure (47a), dans celle partie qui est comprise
entre lesdites deux premières nervures (47b).
8. Plancher avec des éléments préfabriqués à intrados plat selon la revendication 3,
dans lequel, chaque élément préfabriqué (2, 21, 41, 47) les premières nervures (2b,
21b, 41b, 47b) comprennent des éléments de jonction (7) au-dessous de celles-ci, qui
relient lesdites premières nervures à la plaque inférieure (2a, 21a, 41a, 47a) .
9. Plancher avec des éléments préfabriqués à intrados plat selon la revendication 3,
dans lequel chaque élément préfabriqué (2, 21, 41, 47) est précontraint au moyen de
bandes adhérentes (11) précédemment sollicitées en tension.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description