SU987033A1 - Ferroconcrete foundation slab - Google Patents

Description

(54) FOUNDATION CONCRETE PLATE

one

The invention relates to the construction, in particular to the structures of shallow foundation slab foundations.

The famous reinforced concrete slab is reinforced with upper and lower grids of grids 1.

A disadvantage of the known plate is the high consumption of reinforcement in the upper floor of the grids and incomplete provision of concreting conditions due to the continuous upper grid.

The closest technical solution to the proposed one is a foundation reinforced concrete slab, reinforced with upper and lower rus grids placed in rows, oriented in the working direction 2.

A disadvantage of the known plate is the high consumption of reinforcement due to the overlapping of the grids, as well as the difficulty of concreting the plate in the zones of the grid joints.

The purpose of the invention is to reduce rebar consumption and improve concreting conditions.

The goal is achieved by the fact that in a known foundation reinforced concrete slab reinforced by mixed upper and lower mesh floors oriented in the working direction, the grids in the rows of both Rus are placed with a gap located in the compressed zone of concrete, and the grids of adjacent rows of each Rus and grids located one under another of the rows of the upper and lower rus are placed relative to each other with a mixing equal to 0.45-0.55 of the length of the grid.

FIG. 1 shows a general view of the base plate; in fig. 2 shows the layout of the upper and lower ranks of the grids;

10 as well as frames; in fig. 3 shows section A-A in FIG. 2; in fig. 4 shows a section BB in FIG. 2

The foundation concrete slab is reinforced with the upper 1 and lower 2 ru15 grids of both Rus themselves, arranged in rows 3 and oriented in the working direction. In rows 3, the grids of both Rus 1 and 2 are placed with a gap of 4, which are located in the compressed zone of concrete. Nets

20 adjacent rows of each Rus I and 2 and grids located one above another of the rows of the upper and lower Rus are placed relative to each other with a mixing equal to 0, 45-0.55 of the length of the grid.

Frames 5 are located in the transverse direction. Walls 6 (or. Columns) are located along the axis (fig. 1, 3 l 4).

The grids of the lower tier 2 are no less than under two steppes, and their ends are within the middle of the span, i.e. in the compressed zone of concrete. The grids of the upper tusk 1 are also no less than under two walls, and their ends are within the limits of the zone of bearing 6, i.e. also in the compressed zone.

The grids of adjacent rows of each tusk and grids located one under another of the rows of the upper 1 and lower 2 rus are placed relative to each other with a mixing equal to 0.45-0.55 of the grid length, which makes it possible to have a solid in any vertical section of the plate working (upper and lower) reinforcement.

The proposed reinforcement of the reinforced concrete slab allows to avoid overlapping of the grids with each other, which ensures a reduction in the consumption of reinforcement by 10-12% of the amount of reinforcement per slab.

The application of the proposed plate reduces not only the consumption of valves, but also improves the conditions of concreting the foundation

thanks to the gaps between adjacent grids.

Claims (2)

1. Leonardo D. A. Foundations and Foundations. M., stroiizdat, 1968, p. 271, p. 2, 29 a 2. Guide to the design of base plates of frame buildings. M., stroiizdat, 1977, p. 64, p. 17 b. .3 ss