[0001] The present invention relates to a fastening arrangement used in connection with
multilayer building units, the units comprising a core part of thermal insulation
material and surface plates covering it on both sides, the surface plates having a
tongue on one longitudinal edge and a groove on the opposite edge, in which units
the short sides between the tongue-and-groove edges are straight, the building units
being intended to be joined with one another by means of a tongue-and-groove joint
to form a row of successive units and the said rows to be positioned adjacent to one
another in such a way that a joint seam is formed between the rows, at the point between
the short straight sides of adjacent units positioned opposite one another, which
units are secured to the framework at least at the said short sides by screws or similar
fastening means.
[0002] The aim of the present invention is to provide a relatively simple fastening arrangement
for fastening multilayer building units (sandwich units) to frameworks and at the
same time to provide sealing of the not tongued and grooved joint seam between the
short straight sides. To achieve this aim, the fastening arrangement according to
the invention is characterised in that the arrangement comprises:
- a first fastening strip which is mountable on the short side of the first unit, in
the edge area of the unit, and can be secured in place in the framework by screws
or similar fastening means, at the same time securing the first building unit underneath
the strip in place,
- a second fastening strip which can be joined by one edge to the first fastening strip
and extends across the joint seam to the edge area of the short side of the adjacent
second building unit and can be secured in place in the framework by screws or similar
fastening means, at the same time securing the second building unit underneath the
strip in place,
and that on the surface of each fastening strip to be placed against the outer surface
of the building unit is integrated a sealing means which is placed against the said
outer surface.
[0003] The solution according to the invention makes possible rapid mounting of the units
and sealing of the not tongued and grooved joint seam between the short straight sides
of adjacent units in the same work phase. Furthermore, the fixing screws exert a more
uniform pressure on the surface plate of the unit through the fastening strip and
provide uniform and good compression on the seal.
[0004] The invention is described in greater detail in the following, with reference to
the appended drawings, in which:
- Figure 1
- shows a diagrammatic front view of the positioning of the multilayer building units
on top of one another and in adjacent rows,
- Figure 2
- shows a diagrammatic cross-section of the tongue-and-groove joint of the multilayer
building units according to Figure 1,
- Figure 3
- shows the joining point between the straight sides of the adjacent multilayer building
units of Figure 1 in horizontal section,
- Figure 4
- shows an example of an embodiment of the arrangement according to the invention as
a diagrammatic horizontal section such as shown in Figure 3, with one fastening strip
mounted in place,
- Figure 5
- shows an embodiment according to Figure 4 with both fastening strips mounted in place,
- Figure 6
- shows a top view of a sealing positioned between two fastening strips mounted on top
of one another in vertical direction when positioned inside the fastening strip, and
- Figure 7
- shows a front view of the sealing according to Figure 6.
[0005] In Figure 1, reference numerals 1a-3c designate multilayer building units comprising
a core part of, for example, mineral wool and surface plates covering it on both sides.
The core part may also be of other thermal insulation material, such as polyurethane.
The units are in adjacent rows, the rows including several units placed on top of
one another, in the example of Figure 1 there being three units 1a-3a, 1b-3b and 1c-3c
in each row. Between the rows of units is in each case formed an essentially vertical
joint 5. Figure 2 shows a vertical section of a joint between two units 1a, 2a which
are on top of one another. The core part of the units is designated by reference numerals
10 and 10' and the outer surface plate by reference numerals 11a and 11a'. The units
to be positioned on top of one another are joined together by a tongue-and-groove
joint which, according to Figure 2, comprises a tongue 7 formed on the upper edge
of the surface plate 11a' of the lower unit 2a and a groove 8 formed on the lower
edge of the surface plate 11a of the upper unit 1a, the said tongue and groove being
designed in the embodiment shown in such a way that when the units are positioned
on top of one another, an outwards opening, clearly distinguished V-shaped groove
at the joint 9 is formed at the tongue-and-groove joint. The groove at the joint 9
may also be designed in many other ways, for example, so as to have a square, rectangular
or curved cross-section or a combination of these. The groove at the joint may also
be a less distinctive line-like groove.
[0006] Figure 3 shows the joining point between adjacent building units 1a and 1b in horizontal
section. Each unit is secured by its short side 16, which is not tongued and grooved,
between the grooves at the joints 9 between its lower edge and upper edge to the framework,
the framework in the embodiment in Figure 3 being an I-beam 13, to which the unit
is secured by means of the fastening means designated by reference numeral 14, such
as self-drilling screws. The inner, framework-side surface plate of the units 1a 1b
is designated by reference numerals 12a and 12b, and the outer surface plate by reference
numerals 11a and 11b, respectively. Between the adjacent units 1a and 1b remains a
joint seam 5, which is preferably filled with a layer of insulating wool which is
softer than the relatively hard mineral wool that forms the core part 10. To prevent
the entry of moisture, this joint seam 5 is usually covered with a covering strip
which is typically secured to the surface of the units by using separate mechanical
fasteners, such a screws or rivets, and sealed, for example, with a sealing compound
or sealing strip. The material of the covering strip is typically sheet steel.
[0007] According to the present invention, the fastening takes place in accordance with
the embodiment of Figures 4 and 5 by using fastening strips placed in the edge area
of the short side, against the outer surface 11a, 11b of the unit, and secured to
the framework 13 with fastening means 14, for example self-drilling screws, which
simultaneously penetrate the unit 1a, 1b underneath the strip. The fastening arrangement
comprises a first fastening strip 20, which is secured in the edge area of the short
side of the first unit 1a, and a second fastening strip 21, which can be joined by
one edge in a pivoting manner to the first fastening strip 20, and extends across
the joint 5 to the edge area of the short side of the adjacent second building unit
1b and can be secured in place by screws or similar fastening means 14, the said means
extending through the second building unit 1b underneath to the framework 13. The
second fastening strip 21 is designed so as to cover the fixing screws 14 in the first
strip 20 and is essentially J-shaped in cross-section on one edge, in such a way that
the shorter branch of the J is placed against the outer surface 11b of the unit 1b.
In the longer branch of the J extending across the joint 5 are formed openings 26
(Figure 7) through which the fastening means can be led and secured to the framework
in such a way that their outer ends are placed against the inner surface 23 of the
short branch of the J. The through holes may preferably be covered by separate sealing
plugs.
[0008] On the surface of each fastening strip 20, 21 placed against the outer surface 11a,
11b of the building unit 1a, 1b is integrated a sealing means 22 to be placed against
the said outer surface. Each strip 20, 21 preferably extends essentially over the
entire length of the short side of the unit, but they may also be arranged to be shorter
or to extend across two or more units and also to be of different lengths. Between
the fastening strips 21, 21' to be mounted on top of one another in vertical direction
is preferably arranged a sealing means 25 in accordance with Figures 6 and 7, to ensure
the tightness of the joint 5 against external moisture. This type of sealing means
25 between the fastening strips is preferably designed to correspond in cross-section
to the shape of the interior formed by the first and second fastening strips, as appears
from the embodiment of Figure 6, and to extend across the joint seam 27 between the
strips on top of one another over some distance inside the interior, as shown in Figure
7.
[0009] The fastening arrangement according to the invention forms a watertight joint directly,
as regards the joint 5 and, if desired, makes possible the use of separate decoration
strips (not shown), which do not need to be watertight. This type of decoration strip
can be fastened, for example, by forming a fastening groove 24 in the fastening strip
21, to which one edge of the decoration strip can be secured and by placing the opposite
edge of the decoration strip in the gap between the outer edge on the sealing 22 side
of the first fastening strip 20 and the surface plate 11a of the unit 1a.
1. A fastening arrangement used in connection with multilayer building units, the units
(1a, 1b) comprising a core part (10) of thermal insulation material and surface plates
(11a, 12a; lib, 12b) covering it on both sides, the surface plates having a tongue
(7) on one longitudinal edge and a groove (8) on the opposite edge, in which units
the short sides (16) between the tongue-and-groove edges are straight, the building
units being intended to be joined with one another by means of a tongue-and-groove
joint to form a row of successive units and the said rows to be positioned adjacent
to one another in such a way that a joint seam (5) is formed between the rows, at
the point between the short straight sides of adjacent units (1a, 1b) positioned opposite
one another, which units are secured to the framework (13) at least at the said short
sides by screws or similar fastening means,
characterised in that the arrangement comprises:
- a first fastening strip (20) which is mountable on the short side of the first unit,
in the edge area of the unit, and can be secured in place in the framework (13) by
screws or similar fastening means (14), at the same time securing the first building
unit (1a) underneath the strip in place,
- a second fastening strip (21) which can be joined by one edge to the first fastening
strip (20) and extends across the joint seam (5) to the edge area of the short side
of the adjacent second building unit (1b) and can be secured in place in the framework
(13) by screws or similar fastening means (14), at the same time securing the second
building unit (1b) underneath the strip in place,
and that on the surface of each fastening strip (20, 21) to be placed against the
outer surface of the building unit is integrated a sealing means (22) which is placed
against the said outer surface.
2. A fastening arrangement as claimed in claim 1, characterised in that the first (20) and/or second fastening strip (21) extends essentially over the whole
length of the short side.
3. A fastening arrangement as claimed in claim 1 or 2, characterised in that a sealing means (25) is provided between the fastening strips (21, 21') mounted on
top of one another.
