Cantilever pouring arch control method with constant buckle force and controllable internal force and deformation of main arch

Abstract

The invention relates to the field of reinforced concrete arch bridges, in particular to a cantilever pouring arch control method with constant buckle force and controllable deformation of the main arch internal force, comprising the following steps: Step 1, the number of buckle cables is constant and the cable force is constant. Objective, combined with the influence matrix principle and optimization calculation theory, to solve the initial tension of each buckle cable, so that in the cantilever pouring construction, the internal stress of the arch rib is evenly distributed, and the linear deformation is within the allowable range; Step 2, using the cable-stayed buckle For hanging system cantilever pouring arch ribs, in each cantilever construction stage, after the corresponding cantilever segment is formed, the cable force of the buckle cable of the previous cantilever segment is applied to the corresponding initial tension calculated in step 1, and then the cantilever segment is formed The end of the section is connected to the buckle cable again to prepare for the construction of the next cantilever stage until the ribs are closed.

Description

technical field [0001] The invention relates to the field of reinforced concrete arch bridges, in particular to a cantilever pouring arch control method with constant buckle force and controllable main arch internal force and deformation. Background technique [0002] The cantilever pouring cable-stayed buckle-hanging construction method of reinforced concrete arch bridges has low requirements on the site, and has wide application value in the construction of arch bridges in mountainous areas of our country. In this method, temporary stay cables are used to buckle the poured arch ring segments, and the arch ring concrete is cantilevered segment by segment symmetrically from the arch foot by using a mobile hanging basket until the vault is closed. The buckle cable force in the construction of the cable-stayed buckle-hanging method has a direct impact on the internal force of the arch ring during the construction process, the internal force and the line shape of the arch ring ...

AI Technical Summary

Problems solved by technology

In the process of cable adjustment and cable removal, the force of the fastening cable varies greatly. The application of the fastening cable after the fastening often leads to the loosening of the fastening fastening cable and the significant decrease of the cable force, so that the construction reaches the maximum cantilever stage. At the same time, the unbalanced horizontal force generated by the buckle cable and the anchor cable on the buckle tower will change drastically during the process of cable adjustment and removal, which will cause the buckle tower to tilt and horizontally displace The increase will affect the safety of the entire cable-stayed buckle system

[0004] In addition, at the maximum cantilever stage, when the first fastening cable withdraws from work, the force of the fastening cable will be concentrated on a small amount of tail cable (the fastening cable near the closing end), so that the maximum cable force of the fastening cable increases, and the rear fastening cable The force of the buckle cable also increases significantly, and the center of gravity of the buckle tower cable force moves up, which increases the risk of the buckle-anchor system; make full use of, waste

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