RU2581069C2 - Hollow-core floor slabs with openings - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the field of construction and can be used in the production of hollow-core slabs with a technological opening intended for the passage of utilities. Design of the plate consists of two solid bodies, hollow and solid cross-sections, with concrete and rebar dowels combined into a single unit. Solid body of the plate at a distance of 250…350 mm from the end of the opening diameter of posted 600…700 mm, is reinforced by the individual contour rods arranged in the upper part of the section.

EFFECT: technical result is to increase the functionality and performance of the hollow-core slabs by devices in the process plate opening.

1 cl, 5 dwg

Description

The invention relates to the field of construction and can be used in the manufacture of multi-hollow floor slabs with a technological opening designed to allow air ducts in floors, device evacuation hatches in loggias and balconies, hatches in the ceiling of cellars and special structures.

Well-known designs of prefabricated multi-hollow floor slabs that do not have a technological opening, therefore, when such an opening is required when installing the floor slabs, multi-hollow plates have to be replaced with ribbed or solid ones with an opening, which complicates the installation of the floor, increases the product range and leads to an increase in the cost of the object.

For the prototype adopted prefabricated hollow core slab with voids with a diameter of 159 mm, which does not have an opening.

The technical result of the present invention is the expansion of the functional and operational qualities of a multi-hollow floor slab due to the opening device with a diameter of 600 ... 700 mm, located on a limited surface area of the slab at a distance of 250 ... 350 mm from the end.

The technical result is achieved as follows.

The slab consists of two monolithic bodies of hollow and solid sections, united into a single block by concrete keys placed in a preformed hollow body, and longitudinal rods located in its lower part. The solid body of the plate contains a technological opening with a diameter of 600 ... 700 mm, placed at a distance of 250 ... 350 mm from the end. The monolithic body along the contour of the opening is reinforced with individual rods with a diameter of at least 12 mm, placed in the upper part of the section, and in the longitudinal direction along the axes of the extreme voids - with frames 400 ... 600 mm long from cold-drawn reinforcing wire with a diameter of 4-5 mm with a step of transverse rods of 50 ... 100 mm

The design of the plate is illustrated by the following drawings.

In FIG. 1 shows a general view of the plate in plan.

In FIG. 2 - sections AA, BB, BB, GG from FIG. one.

In FIG. 3 - location in terms of punches and diaphragm.

In FIG. 4 - plate reinforcement.

In FIG. 5 - aperture and screen.

The plate is made as follows:

Frames (1, 2) are placed in the formwork, and then a diaphragm (4) is placed and fixed at a distance of 1.1 m from the end, dividing the concrete zone into two sections - the first and second. Punches are placed (5), after which concrete mixture is laid and vibro-compacted in the first section. Then the punches and diaphragm are removed. Concrete plugs (6) are installed in the voids of the molded concrete body. On the second section, an opening of the opening (7), a protective screen (8), rods (9) and frames (10) are placed. The concrete mix is laid and vibro-compacted, which, penetrating into the voids, forms dowels (11). After a set of concrete stripping strength, the liner of the opening and the protective screen are removed.

Information sources

1. V.M. Bondarenko, P.O. Rimshin et al. Reinforced concrete and stone structures - M.: Higher School, 2002.

2. Hollow core slabs reinforced concrete. Series 1.141-1.

3. Prefabricated hollow core slab. RF patent No. 2056487.

Claims (1)

A multi-hollow slab, characterized in that it contains a concrete body with longitudinal reinforcement, located mainly in its upper and lower parts symmetrically to the longitudinal axes of the longitudinal voids, as well as symmetrical loop grips located in the voids of the concrete body, through-hole grips made over symmetrical loop grips, characterized the fact that the slab consists of two monolithic bodies of hollow and solid sections, combined into a single block with concrete dowels placed in a preformed hollow body, and longitudinal rods placed in its lower part, the solid body of the plate contains a technological opening with a diameter of 600 ... 700 mm, located at a distance of 250 ... 350 mm from the end, the monolithic body along the contour of the opening is reinforced with individual rods with a diameter of at least 12 mm, placed in the upper part of the cross-section, and in the longitudinal direction along the axes of the extreme voids, with frames of 400 ... 600 mm in length made of cold-drawn reinforcing wire with a diameter of 4-5 mm with a pitch of transverse rods of 50 ... 100 mm.

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