Method and system for erecting steel trusses by stay cable auxiliary complete cantilever

Abstract

The present invention is a method and system for erecting a steel truss beam assisted by a cable-stayed full cantilever. The method uses a sling tower combined with a steel structure central tower column and a cable-stayed cable; The tower crane on the top of the end of the truss girder; after the anchor boxes of the front and rear cable stays are connected with the lug plates of the steel girder joints, the tower is directly lifted to apply the pretension of the cable stays; Cantilever erection. After the hole steel girder is erected, use the method of raising the temporary support of the front pier and lifting equipment between the upper and lower supports of the sling tower to complete the cable force unloading of the stay cables. The system includes tower auxiliary truss, tower center column, upper and lower support bases, front and rear stay cables, stay cable upper and lower anchor boxes, tower top anchor beams and running mechanism. Advantages: For large-span continuous steel truss girders, a special equipment is used to assist the erection of multi-span steel truss girders, which can reduce the internal force of steel truss girder member installation, reduce the deflection of the front outrigger end, and increase the roll stability of the outrigger steel truss girder sex. And the investment is small, the cycle is short; the operation is very convenient.

Description

technical field [0001] The invention relates to a method and a system for erecting steel truss girders with cable-assisted full cantilever erection for railway or highway steel truss girder bridges. It belongs to the technical field of steel truss girder erection construction. Background technique [0002] In the prior art, the construction techniques for erecting large-span continuous steel truss girders in water (or multi-span steel truss girders that are continuous first and then simply supported, the same below) mainly include the full cantilever assembly method, the front pier construction receiving bracket method, and temporary Pier semi-cantilever assembly method, stay cable assisted full cantilever assembly method. Each of these construction methods has its applicable scope and characteristics. Such as the full cantilever assembly method, this construction method is suitable for the assembly and erection of multi-span continuous steel truss beams (same as above) wi...

AI Technical Summary

Problems solved by technology

[0005] However, as the span of the steel girder increases, the load on the temporary pier in the middle increases, especially for large-span, deep water, rapid flow, and poor geological conditions of the river bed. The design and construction of the temporary pier are basically as difficult as the construction of the permanent pier foundation. Quite, its investment will increase sharply

Images