RU2784548C1 - Building structure - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the field of construction, in particular to the field of building structures for the construction of residential and public buildings from precast concrete. The building structure consists of a reinforced concrete slab, flat in the upper part and flattened from the bottom surface with ribs along the perimeter directed downwards of the slab, with reinforcement of the upper surface with mesh and ring reinforcement with a protective layer in the ribs. In the lower part of the ribs on the outer side along the perimeter of the slab, a recess is made, in which an annular closed prestressed reinforcement is laid and which is filled with a protective composition. The ends of the annular closed reinforcement are equipped with upset heads and are inserted into a connector consisting of two stops with slots for upset heads. The reinforcing mesh is made in the form of a flat spiral, the circles of which are interconnected by radial reinforcement over the entire surface of the slab.

EFFECT: creation of construction for residential and public buildings from precast concrete.

3 cl, 6 dwg

Description

The invention relates to the field of construction, in particular, to the field of building structures for residential and public buildings erected from precast concrete.

Building structure consisting of a reinforced concrete slab flat in the upper part and flattened from the bottom surface with ribs along the perimeter directed downwards of the slab with reinforcement of the upper surface with a mesh and ring reinforcement with a protective layer in the ribs, characterized in that in the lower part of the ribs on the outside along the perimeter a recess was made in which an annular closed prestressed reinforcement was laid and which was filled with a protective composition.

In addition, the ends of the annular closed reinforcement with upset heads are inserted into a connector consisting of two stops with slots for upset heads.

In addition, the reinforcing mesh is made in the form of a flat spiral, the circles of which are interconnected by radial reinforcement over the entire surface of the slab.

Known designs of multi-storey buildings from monolithic bulk blocks (1), manufactured in the factory or at landfills. Volumetric blocks of the "cap" type have a prismatic shape, during installation they are installed on top of each other. Most often, the ceilings of such volumetric blocks are made not flat, but fluffed, which allows them to be removed from spatial forms without damage, i.e. the surface of the ceilings is not flat, but convex. The ceilings are rigidly connected to the four walls of the volume blocks.

The conjugation of volumetric blocks in the plan forms the construction of a multi-storey building. The walls of the blocks perceive a vertical load, and when exposed to a horizontal wind or seismic load. Buildings from such blocks are most widely used in construction practice. At the same time, the ceilings give rigidity to the volumetric blocks and in many cases are fluffed up.

The closest technical solution in relation to the claimed solution is the design of a multi-storey building (2), described in the patent RU N 2742782, class. Е04В 1/348 1994, where round floor slabs with a flattened bottom surface with ribs along the contour inside of which the working reinforcement is installed are also used. The top of the slabs is reinforced with conventional reinforcing meshes.

The specified well-known solution (2) is taken as a prototype. It is characterized by the fact that the design of a multi-storey building includes round flattened floor slabs with ribs along the contour directed downwards. Working reinforcement is laid in the ribs, and the slab is reinforced with a flat reinforcing mesh.

The disadvantage of this design is that the working reinforcement in the ribs of the plate to ensure crack resistance has an increased consumption of metal, since reinforcement not higher than class A500 is used. The reinforcement mesh in a floor slab with ordinary square cells does not fit into the shape of a round slab and waste may occur during manufacture.

The aim of the invention is to create a construction of a flattened floor slab with a minimum consumption of reinforcing steel through the use of prestressed reinforcement and changing the type of grids of the flat part of the slab. More technologically advanced and reducing metal consumption due to the absence of waste.

The essence of the invention is that in the lower part of the ribs on the outer side along the perimeter, a recess is made in which an annular closed prestressed reinforcement is laid and which is filled with a protective composition.

In addition, the ends of the annular closed fitting with upset heads are inserted into a connector consisting of two stops with slots for upset heads.

In addition, the reinforcing mesh is made in the form of a flat spiral, the circles of which are interconnected by radial reinforcement along the entire surface of the slab.

The essence of the invention is disclosed in the drawings, which shows

in fig. 1 - general view of a reinforced concrete sparged slab,

in fig. 2 - section of a reinforced concrete sparged slab,

in fig. 3 - connection of the ends of the reinforcement through the stops with the help of upset heads,

in fig. 4 - general view of the design of stops for upset heads,

in fig. 5 - in the section, protection of prestressed reinforcement from the effects of fire,

in fig. 6 shows a mesh with helical reinforcement.

The building structure of a fluted reinforced concrete floor slab 1 (Fig. 1) consists of a slab with a lower fluted surface 2, i.e. concave, with an annular rib 3 directed downward along the plate contour. Rib 3 along the contour have a groove 4 which can be located adjacent to the ends of the rib or can be slightly shifted above the lower end of the ribs of the plate. In the groove 4 there is an annular prestressed reinforcement 5, which can be a rod. At the top, the rib 3 may have a cut-out 6 to support an adjacent structure on it. To lift the loop, hole 7 is used in its center. The ends of the annular reinforcement 5 are interconnected.

In FIG. 2 shows in section, the plate 1 in the ribs 3 has a transverse reinforcement 8, which can be made in the form of L-shaped rods. The slab 1 itself is reinforced in area with a reinforcing mesh. In FIG. 3 shows that the ends of the transverse reinforcement have upset heads 10 with washers 13 that come into contact with the connector 12 when the reinforcing bars 5 are pretensioned.

Connector 12 (Fig. 4). consists of a plate 14 and two stops 15, each of which consists of two identical elements. To protect against fire, the annular reinforcement 5 grooves 4 (Fig. 5) are sealed with concrete 16 or fire retardant.

The area of the slab 1 is reinforced instead of grids with rectangular cells, spiral reinforcement 17 with radial rods 18.

Plates of this type can be made in special shapes. Their reinforcement is carried out by transverse reinforcement 8 and spiral mesh 17 with radial rods 18, which is manufactured on special equipment using automatic spot welding for welding radial rods. After molding and heat treatment, on a special table, reinforcement of a class is heated, for example, A500s, in which heads 10 are planted in advance. The reinforcing rod 5 is shaped into a ring and the head 10 is put on the stops 15 of the connector 12. As it cools, the compression stresses are transferred to the concrete of the annular rib 3 plate 1. Then the groove 4 with prestressed reinforcement 5 is sealed with high-strength concrete mix or fire-resistant compounds to protect the reinforcement from fire.

The operation of such a plate under load due to the spacer is highly efficient. Such a slab per unit area has the minimum reinforcement of all known reinforced concrete floors. With a vertical load on the plane of the slab, a thrust occurs and all forces are transferred to the prestressed annular reinforcement.

LITERATURE

1. Monfred Yu.V. etc. Buildings from volumetric blocks. - M.: Stroyizdat, 1974, p. 22.

2. Patent RU N 2742782 dated July 17, 2020, class. E04B 1/348, 1994.

Claims (3)

1. A building structure consisting of a reinforced concrete round slab, flat in the upper part and fluffed from the side of the lower surface with ribs along the perimeter directed downward of the slab with reinforcement of the upper surface with a mesh and annular reinforcement with a protective layer in the ribs, characterized in that in the lower part ribs on the outer side along the perimeter of the slab, a recess is made, in which an annular closed prestressed reinforcement is laid and which is filled with a protective composition. 2. The building structure according to claim 1, characterized in that the ends of the annular closed reinforcement are provided with upset heads and are inserted into a connector consisting of two stops with slots for upset heads. 3. The building structure according to claim 1, characterized in that the reinforcing mesh is made in the form of a flat spiral, the circles of which are interconnected by radial reinforcement over the entire surface of the slab.

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