RU73363U1 - REINFORCED CONCRETE PLATE WITH EMPTINGS - Google Patents

Abstract

The invention relates to the field of construction and can be used for the device of reinforced concrete slabs of buildings and structures for various purposes. An object of the invention is to provide a device for a reinforced concrete slab with voids inside it with minimal material costs, cost-effective and technologically advanced in manufacture. The problem is solved in that for the formation of voids in the plate sets are used, consisting of shells of a cylindrical shape, filled with air under pressure. In addition, the shells in the kit are located at intervals between each other. In addition, the shells are connected along the longitudinal sides by elastic inserts. In addition, the shells are equipped with bottom dna, providing the required distance to the plane of the formwork. In addition, a reinforcing bar is passed through the hole in the spacers. In addition, the shells at the junction with the Dniester cells have thickenings. 1 out of. p. 4 s.p. f-ly, 10 ill.

Description

The invention relates to the field of construction and can be used for the manufacture of prefabricated and monolithic reinforced concrete slabs of buildings and structures for various purposes.

Known prefabricated reinforced concrete slabs with round voids (Engineering structures. Edited by Professor R.I. Bergen, second edition. Moscow, "Higher School" 1989, p.230.). For the formation of voids in such plates, special equipment is used and their manufacture is possible only in the factory.

For the formation of voids in monolithic ceilings in building conditions, hollow formers of various designs are used, which remain subsequently in the concrete body.

Known overlap and coating in the form of a reinforced concrete slab, inside which are installed void-forming elements made of hard materials, such as ceramic, or expanded clay concrete, or foam concrete, or expanded polystyrene (patent of the Russian Federation No. 2173750 class. 7 EV04 1/18 from 2000 )

The disadvantages of this design are their complexity, the absence of any devices for fixing them in the formwork in the vertical and horizontal directions.

A known construction of a reinforced concrete slab with a rigid hollow from the bottom side of the core, which also remains in the body of concrete after concreting (patent DE 15558923 from 26 / 08-1971 Germany).

The disadvantage of the proposed design of the hollow core is also the difficulty in its manufacture and devices for fixing its position in the formwork and, accordingly, the high cost, which reduces the effectiveness of its use.

A known design of the liner of an airtight material filled with compressed air (SU 872684 A, E04C 2/46, 1981 - 3 S.), which is adopted by the author as a prototype.

The disadvantages of this solution is that the insert is installed in a molded reinforced concrete panel with longitudinal cavities and does not affect the material consumption and the complexity of manufacturing the reinforced concrete panel itself.

In addition, this solution is not applicable for monolithic reinforced concrete slabs that are concreted at a construction site.

The aim of the invention is the creation of a reinforced concrete slab design with voids economical in cost and labor and technological in manufacturing.

The problem is solved by the fact that prior to the beginning of concreting of a reinforced concrete slab, a void-forming set consisting of airtight shells filled with air under pressure is installed in its formwork.

Each of the shells included in the kit has a cylindrical shape with sealed ends. The shells in the kit are connected along the longitudinal sides by soft but rigid enough to fix the distance between the inserts.

To ensure a given size of shells to the surface of the formwork, plastic spacers are rigidly attached to them along the bottom, which are located along the axis of the shells at certain distances.

Distributors can rely either on the formwork surface or on the bottom reinforcement. In the latter case, reinforcing bars are passed through special slots in the spacers, which are supported by lower bars located perpendicular to them.

The shells are made of an elastic material that has sufficient strength to withstand pressure from air pressure, as well as those that occur when concreting slabs. They can be made, for example, from

polyethylene. Filling the shells with air under pressure can be carried out both at specialized enterprises and directly at the construction site before laying them in the formwork.

Void-forming kits can be delivered to the construction site rolled up, which has certain advantages during their transportation.

Figure 1 shows a plan of a reinforced concrete slab with hollow-forming sets;

figure 2 is a vertical section aa of the plate in figure 1

figure 3 is a fragment of a plate;

figure 4 is a vertical section bB fragment in figure 3;

figure 5 - node connecting the shells to each other;

figure 6 is a vertical section of the node in figure 5;

in Fig.7 - the connection node of the distancer with the shell and the reinforcing bar (option support shell through the reinforcing bar);

in Fig.8 is a horizontal section of the node in Fig.7;

figure 9 - the connection node of the distancer with the shell and formwork (option shell support directly on the formwork);

figure 10 is a horizontal section of the node in figure 9.

The manufacture of reinforced concrete slabs using hollow core kits is as follows.

On the formwork 4, reinforcing rods 6 of the lower zone of the plate are laid with the required pitch.

Then, on top of the lower layer of reinforcing bars 2, a void-forming set 3 is laid, consisting of cylindrical shells filled with air under pressure. To ensure the required clearance between the shells and the formwork plane, the kit is equipped with special spacers. The spacers 9 can rely directly on the upper plane of the formwork 4, or as shown in Fig.7 through the reinforcing bar 12 on the reinforcement 6 of the lower plane of the plate. For

In the latter case, a special hole 13 was made in the spacer to pass the reinforcing bar. In order to strengthen the reinforcement in the support zone of the shell, a thickening was performed 11. After installing the void-forming kit in the gaps between the shells, vertical reinforcing cages 5 having breaks in the lower reinforcing bars are mounted in areas where the shells are connected by rigid inserts. To compensate for the reduction in the cross section of the working reinforcement in these zones, additional pads 15 from the reinforcing bars are additionally installed.

Reinforcing bars 7 of the upper layer are laid on the vertical frames 5 with an installed pitch, after which the slab 1 is concreted.

Claims (5)

1. Reinforced concrete slab with inside round voids and outer layers in the form of reinforced upper and lower plates, connected to each other by vertical reinforced ribs, the voids of which are made using hermetic shells of elastic material filled with air under pressure, characterized in that the shell is cylindrical circular cross-sectional shapes are combined into hollow-forming sets, in which the shells are parallel to each other and at a certain distance d a friend from a friend. 2. The plate according to claim 1, characterized in that the shells in the void-forming set are connected along the longitudinal sides by elastic inserts that have sufficient rigidity to fix the distance between the shells when concreting the slab. 3. The plate according to claim 1, characterized in that to ensure the required distance of the void-forming kit to the formwork plane or to the reinforcing bars, plastic spacers are attached to the shells of the kit at the bottom. 4. The plate according to claim 1, characterized in that in the shells in order to strengthen them in the zone of attachment to them spacers on the underside of the shells made thickening. 5. The plate according to claim 1, characterized in that the reinforcing rods are included in the void forming kit, which are attached to the spacers using a through hole in the spacers.