Steel box girder erection method applied to steel and concrete hybrid girder cable-stayed bridge

Abstract

The invention discloses a steel box girder erection method which is applied to a steel and concrete hybrid girder cable-stayed bridge. Side-span concrete girders are constructed first, and middle-span steel box girders are installed in a segmented mode. The segments of the steel box girders are lifted to a girder transport cart on the constructed side-span girder face through a bridge tail girder lifting gantry, the steel box girders are transported into a cantilever bridge girder erection machine along rails on the girder face through the cart, and then the steel box girders are hoisted, transferred forward, turned, transferred backward and installed through the cantilever bridge girder erection machine. The constructed side-span concrete girders serve as the middle-span steel box girder transportation channel for transporting girders on girders, the steel box girder lifting, transporting and erecting process is not limited by ground construction, and navigation is not affected; the problems of construction environment constraints are solved, and multiple construction devices involved in steel box girder erection are innovatively designed, developed and successfully applied. According to on-site practice, all links are compact and controllable in terms of construction time, the steel box girder erection method is safe, reliable and high in applicability, the defects of a traditional construction method are compensated for, and development of the steel box girder erection construction technology is promoted.

Description

technical field [0001] The invention relates to the field of steel box girder erection, in particular to a steel box girder erection method suitable for steel-concrete mixed girder cable-stayed bridges. Background technique [0002] There are generally two types of conventional erection of steel box girders of cable-stayed bridges: one is the cantilever assembly method. The surface crane is lifted section by section and erected into a bridge; this method requires a transportation channel at the bridge location and will affect the existing traffic under the bridge for a long time. The other is the longitudinal jacking method, which is mainly characterized by setting a jacking construction platform on one side (or both sides) of the bridge, setting up temporary buttresses, slideways, guide beams, etc., relying on the jacking device, single-point or multi-point jacking Push the girder body into place gradually along the longitudinal axis of the bridge, install the stay cables ...

AI Technical Summary

Problems solved by technology

The other is the longitudinal jacking method, which is mainly characterized by setting a jacking construction platform on one side (or both sides) of the bridge, setting up temporary buttresses, slideways, guide beams, etc., relying on the jacking device, single-point or multi-point jacking Push the girder body into place gradually along the longitudinal axis of the bridge, install the stay cables and form the bridge; this method needs to set up a large jacking operation platform, requires ground transportation channels, and the span of temporary buttresses is limited, which affects the existing traffic under the bridge transportation

[0003] The above conventional construction methods cannot meet the erection requirements of the steel box girder of the steel-concrete cable-stayed bridge under the circumstances that the ground transportation is inconvenient and the existing transportation is not affected.

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