Cantilever casting arching control method with constant cable buckling force and controllable main arch internal force and deformation

Abstract

The invention relates to the field of reinforced concrete arch bridges, and particularly relates to a cantilever casting arching control method with constant cable buckling force and controllable mainarch internal force and deformation. The method comprises the following steps that 1, the constant number of the buckling cables and the constant cable force serve as control targets, the influence matrix principle and the optimization calculation theory are combined, the initial tension on all the buckling cables is solved, and in the cantilever pouring construction process, the internal stressof an arch rib is evenly distributed, and linear deformation is within the allowable range; and 2, cantilever pouring of the arch rib is conducted through a cable-stayed buckling and hanging system, in each cantilever construction stage, after the corresponding cantilever section is formed, the cable force of the buckling cable of the previous cantilever section is applied to the corresponding initial tension solved in the step 1, and then the buckling cable is connected to the end of the formed cantilever section again to prepare for construction of the next cantilever stage till the arch ribis 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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