Hollow pipe member for in-situ deposited steel bar reinforced concrete combined structure

Abstract

The hollow pipe member consists of hollow pipe, blockages at two ends of the pipe and transverse reinforcing ribs inside the pipe. All the hollow pipe, blockages and transverse reinforcing ribs have the same cross section shape, circular, square, trapezoidal or other. The member is featured by that its porous transverse reinforcing ribs is used, resulting in light weight and low cost as well as high strength, great deformation resistance, high antiseismic performance and other advantages of the member.

Description

(1) Technical field [0001] The invention relates to a hollow pipe component for a cast-in-place reinforced concrete composite structure. (2) Background technology [0002] At present, in the existing technology, the hole-forming components of cast-in-place hollow slabs are permanent mandrels, such as paper tubes, plastic tubes, metal bellows, and lightweight materials for mandrels. Small floor weight. For example, the patent No. 99249755.8 is a 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. The two plugs seal the two ends of the hard thin-walled tube to form a closed cavity. , The cross section of the hard thin-walled tube and the shape of the plug can be round, square, trapezoidal or other special shapes. After this kind of pipe is applied to the cast-in-place hollow floor, since the tubular concrete in the center of the hard thin-walled pipe of the reinforced concrete floor h...

AI Technical Summary

Problems solved by technology

After this kind of pipe is applied to the cast-in-place hollow floor, since the tubular concrete in the center of the hard thin-walled pipe of the reinforced concrete floor has been evacuated, there are cast-in-place concrete ribs along the longitudinal direction of the pipe, and because the reinforced concrete has been covered by the mandrel or component in the transverse direction. Evacuation, only rely on two plugs to seal as force transmission ribs, therefore, can not bear complex tension, pressure, shear force, torque, etc., there is a situation where the rigidity of the two directions of the cast-in-place hollow slab is very different, and it is impossible to form a well Rib Equivalent Two-Way Plate

If the slab casted by this kind of component is compared with the two-way densely ribbed slab, the consumption of reinforced concrete is large, the weight is heavy, the mandrel cannot act as a shear member, the thickness of the hollow slab is large, the deflection deformation is large, and the resistance to shear and torsion is high. Poor performance, easy cracks at the weak parts of the upper and lower flanges, large difference in two-way force transmission, poor mechanical properties, poor shock resistance, large difference in two-way stiffness, etc.

Images