Cavity member for use in concrete

Abstract

Disclosed is a hollow member for concrete, which comprises a hollow formwork (1), characterized in that at least two of formworks (1) are arranged alternatively, the opposed faces of the hollow formworks (1) constitute a cast-in-situ in-concrete rib moulding chamber (2), the inner rib moulding chamber (2) is provided with at least one spacing tension member for connecting the opposite or adjacent hollow formworks (1), at least one of the corners of the hollow formwork (1) is configured to be a chamfering (4), at least three of the spacing tension members (3) are on a same line. The invention can be applied to various cast-in-situ reinforced-bar concrete or prestressed reinforced-bar concrete hollow building roofings, house roofings, foundation slabs, walls, and hollow bridges, especially for hollow flat slabs.

Description

[0001] This application is a divisional application of an invention patent application with an application date of July 5, 2003, an application number of 200610073468.9, and a title of "a hollow component for concrete". (1) Technical field [0002] The invention relates to a hollow component for concrete. (2) Background technology [0003] At present, the cast-in-place reinforced concrete hollow slab is a widely used floor structure, which has the advantages of fast construction speed, small structural height, flexible division of indoor areas, and no need for ceiling decoration. The lightweight permanent tire molds filled with it are available in various hollow tubes and boxes, hollow or solid. For example, the patent No. ZL99232921.3, which the applicant applied for on March 10, 1999, is a utility model patent named "thin-walled tube for filling cast-in-place reinforced concrete", which consists of a hard thin-walled tube and two plugs. Used in hollow slabs as a lightweig...

AI Technical Summary

Problems solved by technology

However, when this kind of thin-walled box is used as a hollow formwork, it needs to be constructed individually, and it is inconvenient to locate each other, and it is prone to misalignment, which affects the construction quality and efficiency of the hollow slab. At the same time, at the corner of the hollow formwork, the floor The stress of the cover is more complicated, the stress is more concentrated, and it is easy to produce cracks, or even crack and damage. Therefore, it is urgent to develop a new type of hollow member for concrete.

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