Steel box beam erection method for self-anchored suspension bridge

Abstract

The invention discloses a method for steel-box beam erection applied in self-anchored suspension bridge. Procedures comprise that (1) the support for steel-box beam is set on bank or in no-navigation area and steel-box beam is preassembled with dividing segments on the support for steel-box beam; (2) temporary piers for steel-box beam, which satisfy waterway grade, are set in the waterway suspended by the suspension bridge; (3)preassembled steel-box beam is pushed forwards by pushing or dragging method so that the steel-box beam moves to temporary piers for steel-box beam from the support for steel-box beam and the steel-box beam is supported by temporary piers; then the steel-box beam is preassembled in dividing segments and it is pushed or dragged continuously so that preassembled steel-box beam moves forwards and it passes through temporary piers for steel-box beam on waterway in turn to achieve the opposite bank. The invention is provided with simple construction and it can be applied in waterway with busy suspension and higher waterway grade.

Description

technical field [0001] The invention belongs to the field of bridge engineering, in particular to a method for erecting a steel box girder applied to a self-anchored suspension bridge. Background technique [0002] With the development of the national economy and the advancement of bridge construction technology, the performance of steel used in domestic bridge structures has improved. Since the weight of steel box girders is lighter than that of concrete beams, steel box girders are also used in the construction of domestic long-span cable-stayed bridges and suspension bridges. more and more. With the further improvement of urban road network construction, more and more bridge types with better landscape effects are adopted, such as self-anchored suspension bridges, arch bridges, and low-tower cable-stayed bridges. The erection methods of steel box girders vary according to the structure of the bridge, the terrain conditions of the bridge site, the shipping conditions, and...

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Problems solved by technology

[0007] For a bridge with a steel box girder structure, if it crosses a busy river with a high shipping grade, the erection process of the steel box girder will be greatly restricted

First of all, due to the busy shipping in the river, it is not feasible to directly assemble the frame of the steel box girder by erecting construction supports; secondly, due to the lack of large-scale transportation and lifting equipment in China, it is not suitable to close the river with heavy shipping, so the overall hoisting of temporary piers is used. There are also obstacles in the erection of steel box girders by the splicing method; while the cable-stayed cantilever assembly method needs to lift the steel box girders from the beam transport barge for assembly, so the erection process has a great impact on the navigation safety of the river, and the erection of steel box girders on the river bank is also difficult. It is inconvenient, and this method must first form a cable-stayed bridge, and then form a suspension bridge when the system is converted, so it is not suitable for the erection of self-anchored suspension bridges; and the last method of cable-mounted crane frame is generally only suitable for erecting the main cable first. Long-span suspension bridge, and the steel box girder erection process has a great impact on the navigation safety of the river, the steel box girder erection on the river bank needs to be erected by other measures

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