External prestress tensioning device for steel box-concrete composite beam

Abstract

The invention belongs to the technical field related to bridge engineering, and discloses an external prestress tensioning device for a steel box-concrete composite beam. One end of a to-be-treated reinforcing steel bar is inserted into the box girder concrete, the other end of the to-be-treated reinforcing steel bar extends to the outer side of the box girder concrete, when the to-be-treated reinforcing steel bar is cut off, the jack is used for pre-tightening the to-be-treated reinforcing steel bar, supporting rods are symmetrically and obliquely arranged on the outer side wall of the box girder concrete on the upper side and the lower side of the to-be-treated reinforcing steel bar, and the tail ends of the supporting rods are arranged on the jack. The jack is supported; limiting screws are arranged on the supporting rods which are symmetrically arranged up and down in the horizontal direction, steel cable limiting plates are arranged on the limiting screws, and the steel cable limiting plates move front and back on the limiting screws under the action of a gear transmission mechanism according to the cut-off position of a steel bar to be treated so as to change the pre-tightening position of the steel cable limiting plates on the limiting screws. According to the device, the free adjustment of the cutting length of the reinforcing steel bar in the tensioning process of the reinforcing steel bar and the correction of the position of the reinforcing steel bar in the vertical direction in the cutting process are realized.

Description

technical field [0001] The invention belongs to the technical field related to bridge engineering, and more specifically relates to an external prestressed tensioning device for a steel box-concrete composite beam. Background technique [0002] The steel box-concrete composite beam is a new type of composite cross-section beam that combines the characteristics of composite composite beams and steel tube concrete. In the construction of the steel box-concrete composite beam, the tensioning of the steel bars to be processed will be involved, so as to ensure the tensioning effect of the steel bars to be processed. [0003] However, in the existing stretching of the steel bars to be processed, the steel bars to be processed are all stretched through the through-hole jack, but in the process of tensioning, it is impossible to adjust and cut off in time according to the required length of the steel bars to be processed, and it is impossible to treat The function of processing ste...

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Problems solved by technology

[0003] However, in the existing stretching of the steel bars to be processed, the steel bars to be processed are all stretched through the through-hole jack, but in the process of tensioning, it is impossible to adjust and cut off in time according to the required length of the steel bars to be processed, and it is impossible to treat The function of processing the steel bars for correction is to keep the steel bars to be processed in a relatively straight state, which is inconvenient to use

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