A method for determining the control elevation of cantilever construction of cable-stayed bridges

Abstract

The invention discloses a method for determining the cable-stayed bridge cantilever construction control elevation. The method comprises the following steps of determining the theoretical elevation and a pre-lifting value of a target beam section; according to a control point on a reference beam section, building a girder elevation correction equation, and determining an elevation difference of the target beam section caused by temperature and / or loads according to the elevation correction equation; according to the sum of the theoretical elevation, the pre-lifting value and the elevation difference of the target beam section, determining the control elevation of the target beam section. According to the method for determining the cable-stayed bridge cantilever construction control elevation, the rigid precision of a beam can be ensured, and the construction period can be greatly shortened.

Description

technical field [0001] The invention relates to the technical field of engineering construction, in particular to a method for determining the control elevation of cantilever construction of a cable-stayed bridge. Background technique [0002] At present, the superstructure construction of long-span cable-stayed bridges mainly adopts cantilever pouring or cantilever assembly. In cantilever construction, the elevation of the structure is one of the final control indicators. In order to make the alignment of the main girder after the completion of the bridge consistent with the design alignment, the pre-lift value Δh is generally set during cantilever construction. After the completion of the bridge, the pre-lift value of the main girder will be offset to achieve the design alignment. [0003] During cantilever construction of cable-stayed bridges, the theoretical elevation (design elevation) is superimposed on the pre-elevation value as the control elevation, as follows: ...

AI Technical Summary

Problems solved by technology

[0007] The main girders of cable-stayed bridges are generally located high in the air, and the safety risk factor of night measurement is relatively large, and the accuracy is difficult to guarantee

Nighttime measurement is a relatively big test for instruments, equipment and personnel. At the same time, removing the temporary load on the bridge deck will bring additional workload to the construction unit to repeatedly move the temporary construction facilities, which greatly affects the progress of the construction period.

Images