Method for achieving synchronous pushing of large-span steel-concrete composite beams through cable-stayed tower

Abstract

The invention discloses a method for achieving synchronous pushing of large-span steel-concrete composite beams through a cable-stayed tower. The method comprises the steps that: the tower is mounted on a steel box beam, a hinged support is arranged at the bottom of the tower, and the tower is connected with the top of the steel box beam through the hinged support; and a pushing device is used for pushing a guide beam and the steel box beam to a middle pier and a guide beam receiving platform successively from a splicing area, and in the pushing process, under the action of the hinged support, the tower can incline by a small angle. The hinged support is arranged at the bottom of the tower so that the tower can incline, the constraint of rotation in a bridge direction can be released, and the tower and the steel box beam can rotate freely; in the pushing process, when the hogging moment of a pushing cantilever is increased or the guide beam is mounted onto the piers, the change of the horizontal force of the top of the tower can be automatically eliminated in a tower inclination mode, the whole tower is only pressed and is not bent, and the root bending moment is eliminated, so that stress concentration is avoided, the structural safety is guaranteed, and the problem of root stress concentration of the temporary tower during synchronous pushing of the large-span steel-concrete composite beams is solved.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a method for solving the synchronous jacking of large-span steel-concrete composite beams by using a cable-stayed tower. Background technique [0002] The steel box girder jacking construction method is commonly used in the construction of bridges that need to cross rivers and busy roads. It has the advantages of simple construction method, low cost, fast speed, safety and controllability. However, as the geology faced in bridge construction becomes more and more complex, the river crossed by the bridge becomes wider and wider, which makes the span of the steel box girder larger and larger. However, it cannot be used due to factors such as influence, and without setting up temporary piers, there will be further challenges to the line shape control, support reaction force control, and deflection control of the steel box girder. An existing solution is to set a guide b...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above deficiencies, the present invention provides a method for using a cable-stayed tower to solve the synchronous jacking of large-span steel-concrete composite beams, which is used to solve the problem that the tower is fixed on the steel box girder in the synchronous jacking of large-span steel-concrete composite beams. The problem of stress concentration at the connection between the bottom of the tower and the top of the steel box girder

Images