Hollow pipe of concrete

Abstract

A hollow tube for concrete includes a tube body (1), seal heads of tube end (2), two seal heads of tube end (2) seal two ends of the tube (1) to form a hollow tube for sealing the cavity, characterized in that at least one groove (3) is arranged on the tube body (1), a vertical drawing part (6) is provided in the groove (3). So the rigidity difference in vertical and horizontal direction of the concrete cast-in-situ hollow plate is reduced to form bidirection hollow plate and greatly improve mechanical property of the hollow plate, meanwhile, the hollow tube also has advantages of high intensity, easy manufacture, low cost, convenient construction transporting and is adapted to use for hollow bridge, wall body, basic slab, room cover and hollow building cover of various of reinforced concrete cast-in-situ or prestressed reinforced concrete, especially use for the hollow building cover without beam.

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 03143175.5, 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.

Images