Hollow pipe for concrete

Abstract

The hollow pipe for concrete includes a pipe body and two end covers, and the two end covers cover the ends of the pipe body to form a closed cavity. The hollow pipe features the pipe body has parallel notches and supporting part, and the at least one of the pipe body and the end covers has reinforcing part, which is at least one of steel bar, steel wire, steel net, fiber, fiber net, fabric, thin metal strip, etc. The present invention is suitable for various in-situ cast or pre-stressed reinforced concrete hollow floor slab, roof, wall, foundation slab and hollow bridge.

Description

[0001] This application is a divisional application of an invention patent application with an application date of June 19, 2003, an application number of 03143176.3, and a title of "A Hollow Tube for Concrete". (1) Technical field [0002] The invention relates to a hollow pipe for concrete. (2) Background technology [0003] At present, in the existing technology, the hole-forming components of the cast-in-place concrete hollow floor are permanent mandrels, such as paper tubes, plastic tubes, metal bellows, mandrel lightweight materials, etc. These tubular mandrels or components are mainly considered to evacuate concrete , to reduce the weight of the floor. For example, the patent No. 99249755.8 applied by the applicant is a utility model patent for "fiber-reinforced thin-walled tube for filling cast-in-place reinforced concrete". It consists of a hard thin-walled tube and plugs at both ends. Both ends of the tube are closed to form a closed cavity, and the cross section ...

AI Technical Summary

Problems solved by technology

But after applying it to the cast-in-place concrete hollow floor, since the tubular concrete at the center of the hard thin-walled pipe in the cast-in-place concrete floor has been evacuated, there are cast-in-place concrete ribs along the longitudinal direction of the pipe, while in the transverse direction due to the reinforced concrete It has been evacuated by the mandrel or components, and only two plugs are used as force transmission ribs. Therefore, it cannot bear the complex tension, pressure, shear force, torque, etc., and there is a large difference in rigidity between the two directions of the cast-in-place concrete hollow slab. However, it becomes the cast-in-place reinforced concrete hollow one-way slab, which cannot form the equivalent two-way slab with well-shaped ribs.

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