RU212134U1 - Monolithic reinforced concrete beam slab with voids - Google Patents

Abstract

The utility model relates to the field of construction and can be used in the construction of frames of civil buildings, in particular structures of interfloor and attic floors of a beam type made of monolithic reinforced concrete. The device contains non-removable void formers placed in the body of reinforced concrete on linings from waterproof pipes with the same covers on the ends. The covers are made concave inside the pipe, and the linings are in the form of solid calibrated elements, covering and fixing the void formers. Instead of flat covers at the ends of waterproof pipes, covers concave inside the pipes are proposed, and instead of many small concrete flat linings for each pipe, one continuous calibrated element enclosing and fixing several and (or) even all void formers at once in the cross section of the floor slab. The calibrated element here means the shape and dimensions of the lining provided for by the project, which ensure that each void former in the form of a pipe is placed in its cell, while excluding the possibility of free displacement of the pipes relative to each other and the formwork. The technical result consists in ensuring the fixation of the exact position of the void formers in the process of manufacturing the slab by concreting it. An additional resource-saving effect will also be the disposal of solid plastic waste that pollutes the environment.

Description

The utility model relates to the field of construction and can be used in the construction of frames of civil buildings, in particular structures of interfloor and attic floors of a beam type made of monolithic reinforced concrete.

To reduce the own weight of such structures, it is currently quite common to use liners made of light, water-impervious materials in the body of a future reinforced concrete floor slab. For example, a monolithic reinforced concrete floor slab with voids along the working span, reinforced with any kind of frames, is known, in which the voids are formed by polyethylene terephthalic bottles, combined in a chain along the length and remaining in the body of the slab after concreting. The design of the device of this plate has legal protection by the patent of the Republic of Belarus for utility model No. 7667 U [1].

This development, as a prototype, is used in the RF patent for invention No. 2634156 C2 “Method of manufacturing monolithic reinforced concrete beam floor slabs with round voids using non-removable cardboard-polyethylene void formers” [2]. As follows from the name of the said valid patent, the method is also based on the construction of a monolithic reinforced concrete beam floor slab with round voids, using non-removable cardboard-polyethylene tubes made of cardboard, covered with a waterproofing (waterproof) polyethylene film. Moreover, the ends of these pipes are closed with flat cardboard-polyethylene covers, and the pipes themselves are located on concrete linings.

Linings are designed to provide the required thickness of the concrete protective layer by fixing the vertical position of the pipes in the thickness of the concreted slab. But horizontal displacements of pipes by rolling them over flat concrete pads cannot be excluded in this case. Therefore, the applicant provides for the fixation of pipes by screwing with a tie wire, which cannot guarantee the fixation of the unchanged position of pipes and reinforcing cages in the process of laying the concrete mixture with its compaction. Ascent (vertical movement of hermetic pipes) in the concrete mixture during vibration compaction, which briefly acquires the properties of a fluid liquid, is not excluded. To avoid this, the applicant proposes to use mobile inventory platforms that serve as a weight to prevent the emergence of individual pipes with fittings.

Thus, the disadvantage of the described prototype design, which is supposed to be eliminated in our utility model of a monolithic reinforced concrete beam slab with voids, is the inability to accurately fix the position of the void formers with the exception of their displacement during its manufacture by concreting.

In order to achieve the solution of the task of ensuring accurate fixation of the position of void formers from waterproof pipes with covers in the body of a monolithic slab by eliminating their displacement during its manufacture by concreting, a new improved device for a monolithic reinforced concrete beam slab with voids is proposed. This slab contains non-removable void formers placed in the body of reinforced concrete on linings from waterproof pipes with the same end caps. The covers are made concave inside the pipe, and the linings are in the form of solid calibrated elements, covering and fixing the void formers. Instead of flat covers at the ends of waterproof pipes, covers concave inside the pipes are proposed, and instead of many small concrete flat linings for each pipe, one continuous calibrated element is proposed, covering and fixing several and (or) even all void formers at once in the cross section of the floor slab. The calibrated element here means the shape and dimensions of the lining provided for by the project, which ensure that each void former in the form of a pipe is placed in its cell, while excluding the possibility of free displacement of the pipes relative to each other and the formwork. Therefore, the proposed solution has a technical novelty and design differences.

And these listed differences, in combination, serve to ensure the fixation of the exact position of the void formers in the process of manufacturing the slab by concreting it. The concrete mixture will fall into the covers concave inside the pipe at the ends of the pipes and will itself keep these ends from floating and longitudinal horizontal displacement, and the linings covering the pipes, together with these pipes, will create a single unchanging system with sufficient own weight to prevent its initial ascent. And then, the concrete mixture itself will load the void formers from above and from the sides, not allowing them to move in any direction in violation of the design position.

The essence of the utility model is illustrated by graphic materials, where

in fig. 1 shows a longitudinal section of a beam slab with round void formers;

in fig. 2 combines two cross sections 1-1 and 2-2 of this plate in FIG. one;

in fig. 3 shows a general view of the lining as a solid calibrated element.

A monolithic reinforced concrete beam slab consists (Fig. 1) of vertical reinforcing cages 1 of a horizontal distribution grid 2 placed in the body of reinforced concrete 3. To reduce its volume and weight, non-removable void formers from waterproof pipes 5 are mounted on the linings 4. The ends of these pipes 5 are closed with covers 6 is also made of waterproof material. Both for pipes 5 and for their covers 6, as such a material, both the polyethylene-coated cardboard proposed in the prototype, and others, for example, the same polyethylene or other plastic obtained, including as a result of recycling, can be used. municipal solid waste. In this case, the covers are made concave inside the pipe 5. Each lining 4 is made in the form of a solid, across the plate, calibrated element, covering and fixing the void formers from waterproof pipes 5. Once inside the lining 4, each of the pipes 5 occupies a strictly defined position provided for by the project. in concrete block 3.

The production of a monolithic reinforced concrete beam floor slab is carried out as follows.

The prepared reinforcing cages 1 and grids 2 are installed in a pre-assembled formwork (not shown in the drawings) of the ceiling on linings 4. Waterproof pipes 5 will be placed in the curly cutouts of each lining 4, and the ends are covered with the same waterproof covers 6, concave inside the pipes 5. After survey the design position of the linings 4 with pipes 5 and covers 6, as well as reinforcing cages 1 and meshes 2, they start laying the concrete mix 3 in all the remaining unfilled space of the future beam floor slab. Under the action of vibration, the concrete mixture 3 acquires the properties of fluidity, filling all the remaining voids that are not closed, including those in the pipes 5 concave inside, the covers 6. Since all the pipes 5 are fixed relative to the formwork and each other by the covering parts of the linings 4, and at the ends - also by the pressure of the concrete mix 3 laid on both sides, their displacement or ascent become less likely. And after concrete 3 has gained strength, a highly efficient resource-saving floor structure is formed. Its effectiveness lies in a significant reduction in its own weight with a constant payload, and the ability to ensure the exact position of the void formers will reduce the cross section of the concrete part of the slab with the same resource-saving goal. An additional resource-saving effect will also be the disposal of solid plastic waste that pollutes the environment.

Claims (3)

1. A monolithic reinforced concrete beam slab with voids containing non-removable void formers placed in the body of reinforced concrete on linings from waterproof pipes with the same covers at the ends, characterized in that the covers are made concave inside the pipe, and the linings are in the form of solid calibrated elements covering and fixing void formers. 2. The device according to claim 1, characterized in that the covers are made of polyethylene. 3. The device according to claim. 1, characterized in that the covers are made of plastic obtained from the disposal of municipal solid waste.

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