SU121929A1 - Precast reinforced concrete floor - Google Patents

Description

Ceilings of precast concrete with beams are known that have a reinforcing cage exposed in the upper part, with the help of which and plastic concrete they are connected with filling slabs,

In such ceilings, the carrying capacity of the plates is used only partially, and the beams do not take part in the operation of the beams for bending the slabs. In order to ensure the normal operation of the compressed zone of the beams in this type of ceiling, it is necessary to increase the volume of solid concrete and, consequently, the total weight of the ceiling. Therefore, such reinforced concrete floors have significant weight and, as a result, they cannot be used for major repairs of buildings.

The peculiarity and advantage of the described overlap is the joining of beams and filling slabs in it to a monolithic, often ribbed structure, which is achieved by giving a wedge-shaped section to the space between the sides of the plates supported by beams and the gap to be monolithic. The bearing capacity of the plates is used more fully, since they work not only in the direction transverse to the beams (as filling elements), but also in the longitudinal direction, as a compressed zone of the beams. Due to this, it is possible to perform the overlap with a relatively low overall weight, and it is possible to assemble the overlap parts using lightweight lifting mechanisms, which is essential in the conditions of building major repairs.

FIG. Figure 1 shows the overlap with a plate filling and with a wooden ceiling, a transverse section; in fig. 2 is the same in section AA in FIG. one; in fig. 3 - overlapping with the filling of blocks with a smooth concrete ceiling, cross section and in FIG. 4-overlap in section .6.6 in FIG. 3

No. 121929-2 -

The overlap consists of bearing reinforced concrete beams 1 manufactured in the factory, with reinforcing cage 2 exposed in the upper part and non-reinforced from light concrete with bevelled sides of plates or blocks 3. The upper part of the non-opening beams is reinforced with two thin mounting rods 4 designed for perceived negative points that may arise during the transporting of beams or in the process of moptage. The connection of the plates with the beams is achieved by concreting the gaps (spaces) 5 of a wedge-shaped cross-section between the sides of the plates supported by the beams and the gaps 6 between their joined ends. To form gaps 6 at the lower edges of the ends of the slabs, flanges 7 are provided (Fig. 2), which simultaneously prevent the plastic concrete from passing downward when monolithing. Concreting the gaps 5 and 6 in the mounted floor contributes to the jamming of the slabs and on the basis of this rigid connection with the beams. Due to this overlap carries the load, as a monolithic ribbed, the most appropriate in technical and economic terms. To hold the ceiling filler shits 8, antiseptic wooden cranial bars 9, previously hydroinsulated at the interface with concrete, are coated with bitumen or other means, are attached to the beams. The attachment of these bars is carried out by means of anchors (nails) 10 driven into them and is carried out when the beam is prepared at the factory by laying cranial bars with hammered nails into the mold before filling it with concrete.

When performing the overlapping with the filling of blocks with a smooth concrete ceiling, the beams are made with parallel side walls (Fig. 4). and the blocks are made with the upper part arched from the inside, and flanges 7 are also provided for filling the gaps between adjacent blocks at one of the ends of each of them along the entire height of the upper vaulted part.

Subject invention

A precast reinforced concrete floor with bare reinforcement cage at the top of the beams, located between the sides of the slabs supported by the beams and intended to connect them to the beams through concrete introduced in a plastic form when monolithing, characterized in that as a monolithic ribbed, the spaces between the sloping sides of the slabs supported on the beams, filled with concrete, have a wedge-shaped cross section, and the ends of the slabs joined to each other at their lower edges are provided with flanges, forming a gap for filling it with concrete.

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