Threading device for prestressed steel beam and threading method for prestressed steel beam

Abstract

The invention discloses a prestressed steel strand threading device and method. The device comprises a steel strand hole explorer and a steel strand adjusting device. The steel strand hole explorer comprises a conical cylinder, a protective cylinder and a steel strand baffle. The conical cylinder and the protective cylinder are connected through threads. The steel strand baffle is fixed into the protective cylinder. A through hole is formed in the center of the steel strand baffle. The steel strand adjusting device comprises a middle plate, triangular supports and brake universal wheels. The triangular supports are fixed to the two sides of the middle plate. The brake universal wheels are installed at the bottoms of the triangular supports. The middle plate is provided with dredging holes of different diameters. By adopting the design of the steel strand hole explorer and the steel strand adjusting device, threading of a steel strand can be completed through a traction device at a time, and threading of the steel strand can be rapidly and conveniently completed. The prestressed steel strand threading device has the advantages of being simple in structure, convenient and rapid to operate, efficient and the like, is suitable for being widely applied, and saves the cost due to the fact that the steel strand hole explorer and the steel strand adjusting device can be repeatedly used.

Description

technical field [0001] The invention relates to the field of bridge engineering construction, in particular to a threading device for prestressed steel beams and a threading method for prestressed steel beams. Background technique [0002] Prestress is to make up for the phenomenon of premature cracks in concrete. Before the component is used (loaded), a prestress is given to the concrete in advance, that is, in the tensile area of ​​the concrete, the steel bar is stretched by artificial force. Utilize the retraction force of the steel bar to pre-stress the tension area of ​​the concrete. This stored preload, when the component bears the tension generated by the external load, first offsets the preload in the concrete in the tension area, and then increases with the load to make the concrete tension. [0003] This limits the elongation of the concrete, delays or prevents cracks from appearing, and this is what we know as prestressed concrete. During the construction of pre...

AI Technical Summary

Problems solved by technology

"However, the hole finder is connected to the steel beam through the tension formed by inserting the pin. If the tension is too large, the hole finder cannot be disassembled. It can only be used for one time, and it will damage the steel beam head. cause damage

If the tension force is too small, the force on the head of the steel beam will be uneven, and individual steel strands will fall off, causing the steel strands in the steel beam to become knotted and block the pipe.

And without a dredging device, the patent document adopts the method of threading multiple steel strands at the same time, which is too loose due to the influence of the stiffness of the steel strands themselves, and it is easy to cause mutual entanglement and knotting of the steel strands between the steel strands

Images