[0001] The present invention relates to a rib-and-slab floor used in general low building
industry, particularly in housing.
[0002] There are known rib-and-slab floors which consist of partially precast beams and
various types of structural-floor tiles filled with concrete mix on mounting. These
tiles are usually used as filling elements which do not participate in load bearing.
They require casting concrete in a layer of usually 3 cm or more, above their upper
surface. They are, for this reason, very heavy - their bulk totals about 330 kg/sq.m,
at floor span of 5.40-6.00
m and require using large quantities of energy-consuming cement and aggregates. They
are also labour-consuming and a nuisance in transport. Beams which convey loads
in floors are usually I- or almost I-shaped, formed through filling with concrete
mix the free space between tiles and pouring a superlayer of concrete over the upper
surface of structural-floor tiles. This superlayer of concrete simultaneously forms
the upper beam flange.
[0003] Also known are floors in which structural-floor tiles are so formed that the upper
beam flange in the zone of compression, formed during pouring concrete, fills the
space between the tiles only to their upper edge, creating the I-shape of the beam.
[0004] The rib-and-slab floor of the invention consists of structural-floor tile elements,
the upper corner of which have projections which enclose a part of the length of upper
edges of elements and of reinforced concrete ribs constituting carrying joists of
varying longitudinal section in the compression zone. Carrying joists have variable
longitudinal sections in the compression zone in form of cantilevers.
[0005] The variant of the rib-and-slab floor of the invention consists of floor tile elements,
the upper corners of which have projections enclosing part of the length of the upper
edges of elements and lower corners have recesses of enclosing part of the length
of side edges of elements and of reinforced concrete ribs constituting carrying joists
of variable section in the compression zone and variable longitudinal section in the
tension zone. Carrying joists have variable section in the compression zone in the
form of cantilevers and variable section in the tension zone in the form of projections.
The floor of the invention allows to reduce the consumption of concrete cast in situ
by the superlayer of concrete, i.e. by about 66 kg/sq.m, that means about 20% of the
bulk of the floor itself, simultaneously reducing the transport requirements, labour-consumption
of concrete works associated with floor performing.
[0006] The floor tile element, which in other solutions acts only as floor filling and weigh
down the joists with their bulk, in the floor of the invention cooperates with the
beam in conveying loads and deflections.
[0007] Moreover, the floor of the invention may be used in sites of seismic hazards. In
such cases an additional 3 cm superlayer of concrete may be applied, being monolithically
connected with projections present in the beam compression zone.
[0008] The subject of the invention is further described in the embodiment presented in
the drawing, of which: Fig. 1,3 present examples of rib-and-slab floors and Fig. 2,4
present carrying joists used in these floors.
[0009] The floor presented in Fig. 1 consists of floor tile elements 1 and partially precast
beams 2 connected with the use of concrete mix. Floor elements 1 are provided with
projections 3. Concrete mix connecting tiles 1 with partially precast beam 2 creates
carrying joists 4 of variable longitudinal section in the compression zone. Fig. 2
presents carrying joist 4, formed by means of poring concrete mix between tiles 1
over partially precast beam 2. This beam is provided with cantilivers 5.
[0010] The floor presented in Fig. 3 consists of floor tile elements 6 and partially precast
beams 2, connected with the use of concrete mix. Floor elements 6 are provided with
projections 3 and recesses 7. Concrete mix which connects tiles
6 with partially precast beam
2 forms carrying joists 8 of variable longitudinal section in compression zone and
variable longitudinal section in tension zone of the beam. Fig. 4 presents carrying
joist
8 formed by pouring concrete mix between tiles
6 over partially precast beam
2. This beam is provided with projections
9 and cantilevers
5.
1. A rib-and-slab floor consisting of partially precast beams and structural-floor
tiles connected with the use of concrete mix, characterised in that it comprises tile
floor elements 1, the upper edges of which have projections 3, enclosing part of the length of upper edges of elements and reinforced concrete
ribs, constituting the carrying joists 4 of variable longitudinal section in compression zone.
2. Floor as claimed in claim 1, characterised in that the joist 4 has variable section in compression zone in form of cantilevers 5.
3. A rib-and-slab floor consisting of partially precast beams and structural-floor
tiles connected with the use of concrete mix, characterised in that it comprises tile
floor elements 6, the upper corners of which have projections 3, enclosing part of the length of upper edges of elements and lower corners have recesses
7 enclosing part of the length of side edges of elements and reinforced concrete ribs
constituting carrying joists 8 of variable longitudinal section in compression zone and variable longitudinal section
in tension zone.
4. Floor as claimed in claim 3, characterised in that joist 8 has variable section
in compression zone in form of cantilevers 5 and variable section in tension zone
in form of projections 9.
