Tool for shaping hollow tube with ribs being reinforced

Abstract

A shaping tool for manufacturing the ribbed hollow pipe is composed of an open-close elastic cylinder with holes or slots for arranging the reinforcing ribs, two join edges fixed to the axial edges of said elastic cylinder, supporting part wrapped by the end of elastic cylinder for fixing the shape of pipe, and fasteners attached to said join edges for closing the elastic cylinder. Its advantages are simple structure, and high quality of hollow pipe.

Description

(1) Technical field [0001] The invention relates to a stiffening rib hollow tube forming tool for reinforced concrete. (2) Background technology [0002] At present, in many buildings, the large-span and large-bay frame structure adopts the cast-in-place hollow beamless floor technology, which has the advantages of shortening the construction period, reducing costs, increasing the usable space of the building, reducing its own weight, and good seismic performance. The hole-forming components used in beamless slabs are permanent mandrels, such as paper tubes, plastic tubes, metal hollow tubes, hard thin-walled tubes, etc. These tubular mandrels or components are mainly considered to evacuate the concrete and reduce the weight of the floor slab. Among them, paper tubes, plastic tubes, and metal hollow tubes are rarely used because of their high cost. At present, most of the projects use hard thin-walled tubes, such as the "fiber-reinforced thin-walled tube for filling cast-i...

AI Technical Summary

Problems solved by technology

After this kind of rigid thin-walled hollow pipe member is applied to the cast-in-place hollow floor, there are cast-in-place concrete ribs along the longitudinal direction of the pipe, and because the reinforced concrete has been evacuated by the mandrel or the member in the transverse direction, the sealing plugs at both ends cannot be lifted. Therefore, it cannot withstand complex tension, pressure, shear force, torque, etc., and there is a situation where the rigidity of the cast-in-place hollow slab is greatly different in two directions, and it becomes a cast-in-place reinforced concrete hollow single-core slab

The above deficiencies are largely due to the fact that there are no stress-bearing components in this type of hollow pipe, which cannot be coordinated with the cast-in-place reinforced concrete.

For this reason, the applicant filed an application number of 01136050.X on September 30, 2001, and an application for a patent for invention entitled "A Hollow Tube Member for a Cast-in-situ Reinforced Concrete Composite Structure". Ribs, which solve the above problems, have the advantages of high strength, small difference in two-way force transmission, strong shear resistance, torsion resistance, large deformation resistance, and good seismic performance. There are transverse stiffeners, which cannot be implemented on the above-mentioned movable cylindrical inner mold, and it is also difficult to make on the half-tube inner mold, and the thin-walled hollow tube is prone to cracking and damage at the seam, and the integrity is poor. The production efficiency is low, and the manufacturing process is too complicated, especially for the hollow tube components with exposed ribs and meshes on the stiffeners, which are more difficult to manufacture

Trace it to its cause, be that above-mentioned mold has restricted craft, has influenced the quality of thin-walled pipe, therefore, develops a kind of novel stiffened rib hollow pipe forming tool to be urgently needed

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