A Correction Method for the Offset of Middle Hinge without Axial Force of Self-anchored Cable-Stayed Bridge

Abstract

The invention discloses a correction method for correcting shifts of middle hinges without axial forces of a self-anchored cable-stayed bridge, comprising the following specific steps: (1) laying a plurality of observation points on combs of cross sections of expansion joints, and counting an expansion length L1 of the expansion joints by measuring the distance from each observation point to the end of each comb; (2) installing an axial displacement meter on each middle hinge without the axial force to count a displacement length L2 on both sides of each middle hinge without the axial force, determining if the middle hinges without the axial forces are in normal conditions by comparing the displacement length L2 and the expansion length L1, measuring an exsertion length L3 on both sides of each middle hinge without the axial force relative to a corresponding beam if the middle hinges without the axial forces are in abnormal conditions and calculating a homing direction and a homing displacement length of the middle hinges without the axial forces based on the exsertion length L3 on both sides of the same; (3) using a method of applying external forces to push the middle hinges for homing according to the homing direction and the homing displacement length of the middle hinges without the axial forces calculated in step (2). The correction method disclosed by the invention is capable of correcting the shifts of the middle hinges without the axial forces of the self-anchored cable-stayed bridge without damaging the main structure, and ensuring the effective operation of the middle hinges.

Description

technical field [0001] The invention relates to the technical field of correcting intermediate hinges on cable-stayed bridges, in particular to a method for correcting the offset of the axial-free intermediate hinges of self-anchored cable-stayed bridges. Background technique [0002] see figure 1 and figure 2 As shown, in a super-large cable-stayed bridge project, the bridge tower is separated from the main girder, the main girder is rigidly connected to the anchored abutment, and an axial-free intermediate hinge 1 that can slide longitudinally is set in the middle of the bridge span. The joints of the concrete box girders on both sides are provided with plate-type rubber expansion joints 2, and the axial-free intermediate hinges 1 are arranged on the diaphragm beam 4 of the concrete box girder 3. The axial-free intermediate hinges 1 are steel box structures, and the four axial-force-free The intermediate hinge 1 is placed in the steel frame 5 on the four transverse beam...

AI Technical Summary

Problems solved by technology

The non-axial force intermediate hinge is embedded in the concrete box girder transverse partition wall. The non-axial force intermediate hinge and the surrounding PTFE plate supports are in a state of close contact. Do not push and drag blindly. If the support is limited during the construction process Therefore, there is an urgent need to solve the problem of correcting the deflection of the middle hinge of the self-anchored cable-stayed bridge without axial force.

Images