Stretching equipment for bridge vertical rebar

Abstract

The invention relates to stretching equipment for bridge vertical rebar. The stretching equipment comprises a stretching device, a walking device and a power and hydraulic device. The stretching device is installed on a bridge top plate and comprises a pair of support bases, a support hydraulic rod, a hydraulic-rod support disk, a stretch hydraulic rod, a stretching platform and a steel lever component, wherein the pair of support bases are disposed in the width direction of the bridge top-plate top surface, the support hydraulic rod is vertically fixed on the top of the support bases, the hydraulic-rod support disk is vertically fixed on the upper end of the support hydraulic rod, the stretch hydraulic rod is vertically fixed on the top of the hydraulic-rod support disk, the stretching platform is installed in the middle portion of the stretch hydraulic rod, and the steel lever component is disposed on the stretching platform. The walking device is disposed on the bridge top plate and at one side of the walking device, and comprises a walking frame, universal wheels and a plate. The power and hydraulic device is mounted on the walking device and comprises a hydraulic device, a storage battery and a display. The stretching equipment for the bridge vertical rebar has the advantages of convenient operation, good controllability and high stretching efficiency, and can achieve mechanical stretching of the vertical rebar, replace manual labor, guarantee tension prestress quality, thereby saving construction cost.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a bridge vertical reinforcement tensioning device. Background technique [0002] Vertical prestressed steel bar is a prestressed system applied to continuous beams with variable cross-section and continuous rigid frame bridges. Its function is to resist the shear stress in the main beam and enhance the rigidity of the structure. Whether the tension is standardized and whether the tension is up to standard has a great impact on the structure. At present, the tension of vertical prestressed steel bars is mainly done manually, using simple mechanical devices to stretch them. The process of tensioning is time-consuming and laborious, and often The pulling process is not standardized, and the force value is not up to standard, resulting in that the vertical prestress in the beam body is often quite different from the design, and the vertical prestress loss is t...

AI Technical Summary

Problems solved by technology

[0002] Vertical prestressed steel bar is a prestressed system applied to continuous beams with variable cross-section and continuous rigid frame bridges. Its function is to resist the shear stress in the main beam and enhance the rigidity of the structure. Whether the tension is standardized and whether the tension is up to standard has a great impact on the structure. At present, the tension of vertical prestressed steel bars is mainly done manually, using simple mechanical devices to stretch them. The process of tensioning is time-consuming and laborious, and often The pulling process is not standardized, and the force value is not up to standard, resulting in a large difference between the vertical prestress in the beam body and the design, and the loss of vertical prestress is too much

For the application of prestress, a certain operation process is often required, such as stretching to 70% of the prestress value in the first stage, and then stretching again after holding the load for more than 10 minutes. The prestressed tendon can be anchored only after it is deformed or slides stably. The artificial stretching method is generally to pull and anchor immediately, which cannot consider the deformation of the steel bar, which is one of the reasons for the large loss of vertical prestress.

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