RU2228413C2 - Floor slab - Google Patents

Abstract

FIELD: building, particularly construction of floor structures for low-story public and civil buildings. SUBSTANCE: floor slab includes upper and lower reinforced concrete layers and heat insulation layer located in-between. The layers are integrated into rigid box-like frame by counter ribs and discrete vertical connectors. Vertical connectors are made of heavy-weight concrete and formed by orifices created in heat insulation layer. The orifices are equidistant one from another in longitudinal and transverse directions. EFFECT: increased floor rigidity, simplified manufacturing technique. 4 dwg

Description

The invention relates to the construction and can be used in the device floors of low-rise public and civil buildings, such as cottages, individual houses, etc.

Known floor slab, comprising a supporting frame of contour and filling elements in the form of steel beams of the channel type, reinforced concrete layers above and below, respectively, of the floor and ceiling with formwork and insulation elements located between them in the intermediate layer located between the frame elements [1].

The disadvantage of this technical solution is the high consumption of metal in the contour and filling beams of the supporting frame of the plate, which significantly increases the cost of overlap. In addition, the use of rolling channels with a height of up to 200 mm leads to an increase in the own mass of the floor slab and, consequently, the floor slab of the building as a whole, which is ineffective for small buildings.

Known panel overlap, including a reinforced concrete body with channels located in the transverse direction and filled with insulation [2]. This panel is the closest in technical essence and the achieved result to the invention and therefore adopted as a prototype. The reinforced concrete body is made of solid cast and is formed by a volumetric reinforcing cage, upper and lower plates connected by longitudinal and transverse ribs, between which a heat-insulating material is located.

The disadvantages of the prototype are, firstly, the high consumption of materials due to the increased consumption of concrete on the transverse ribs, as well as metal for the manufacture of three-dimensional reinforcing cage, which also works in conditions of different stress conditions, for example in the region of transverse ribs; secondly, the technological complexity due to the need for hollow formers to form transverse channels. These shortcomings indicate a low efficiency of the known design for low-rise construction.

The objective of the invention is to increase the efficiency of the design of floor slabs by reducing material consumption, increasing stiffness, as well as simplifying manufacturing techniques.

To achieve a technical result in a floor slab including upper and lower reinforced concrete layers with insulation placed between them, combined into rigid box sections by contour ribs and vertical ties, according to the invention, the vertical joints are made of heavy concrete discrete and are formed by holes of variable cross section made in the insulation, equally remote from each other in the longitudinal and transverse directions.

Figure 1 shows the slab, top view; figure 2 is the same, a longitudinal section aa in figure 1; figure 3 - insulation; figure 4 is the same, a longitudinal section bB in figure 3.

The slab contains upper 1 and lower 2 reinforced concrete layers, joined along the contour by stiffeners 3, 4. Between layers 1 and 2, a heater is placed in the form of a formwork and sound insulation layer 5 of expanded vermiculite or expanded polystyrene, in which holes 6 are made, which are equally removed from each other from each other in the longitudinal and transverse directions. Holes 6 form discrete vertical bonds 7 made of heavy concrete, connecting the upper 1 and lower 2 layers containing reinforcing mesh 8 made of steel of class BP-I. In the ribs 3, 4 also installed flat reinforcing cages 9 and mounting loops 10.

The slab is made by conveyor technology in the following sequence. In a cleaned and greased metal mold, reinforcing mesh 8 is mounted on the latches to form the lower concrete layer 2, flat reinforcement cages 9 and mounting loops 10 that are fastened and fixed with wire. Then the concrete of the lower layer 2 of the slab is laid and vibrated. Next, a formwork and sound insulation layer of insulation 5 with holes 6 is installed, a reinforcing mesh 8 is installed on the clamps, the concrete of the upper layer 1 of the slab is laid and vibrated, the structure is kept in a heat chamber and redistributed.

Features of the spatial work of the thus obtained floor slabs are as follows. Discrete vertical connections 7 of heavy concrete combine the upper 1 and lower 2 layers of the floor slab in a joint work. In this regard, the rigidity of the structure significantly increases, bending moments in the span and lateral forces on the supporting sections of the plate are reduced. Stresses arising at the border of the upper reinforced concrete layer 1 of the floor slab with a discrete vertical connection 7 are reduced and smoothed due to the variable cross-section of the ties 7. Savings in building materials are achieved through the use of flat reinforcing cages and reduced concrete consumption. The use of expanded vermiculite or expanded polystyrene with openings 6 for discrete vertical bonds 7 formed during the manufacturing process of their use as light insulation is significantly simplifies the manufacturing technology, reduces concrete consumption and, therefore, the cost of floor slabs.

Sources of information

1. RF patent No. 054099, E 04 B 5/00, 5/16, E 04 C 2/04.

2. Auth. testimonial. USSR No. 1784722, E 04 B 5/02 (prototype).

Claims (1)

The slab, including the upper and lower reinforced concrete layers with a heater placed between them, combined in a rigid box section by contour ribs and vertical bonds, characterized in that the vertical bonds are made of heavy concrete discrete and are formed by holes of variable cross section made in the heater, equally spaced from each other each other in the longitudinal and transverse directions.

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