Method of tower-girder spontaneous construction for railway steel trussed cable-stayed bridge

Abstract

A method of tower-girder spontaneous construction for a railway steel trussed cable-stayed bridge enables construction progress to be quickened evidently and total engineering cost to be reduced, and includes the steps: using a tower crane (21) to construct a main tower (10), side piers (11) and temporary piers (20) by creeping formwork process; simultaneously constructing side-span steel girders (12) in construction of the main tower (10), and separating each steel girder (12) into a plurality of segments for erection; constructing tower-side brackets (24), and erecting the steel girders (12) around the main tower (10) onto the tower-side brackets (24); completing construction of the main tower (10) before construction of main span; erecting the main-span steel girders (12) by unidirectional cantilever assembly; and closing up the main-span steel girders (12), completing tensioning of stay cables (13), and constructing auxiliary facilities to complete construction of the bridge.

Description

technical field [0001] The invention relates to a railway steel truss cable-stayed bridge, in particular to a method for synchronous construction of a tower and girder of a railway steel truss cable-stayed bridge. Background technique [0002] Since the construction of modern cable-stayed bridges began in China in the 1970s, it has developed rapidly in the past 30 years, and hundreds of them have been built so far. However, the development of railway cable-stayed bridges is very slow. In recent years, the pace of railway construction has accelerated, and cable-stayed bridge schemes have been proposed in the bridge scheme research of some new lines, especially the preliminary work of the Beijing-Shanghai high-speed railway, which has enabled the design and research of railway cable-stayed bridges to be carried out in depth. The current research on cable-stayed railway bridges has covered spans ranging from more than 200 meters to more than 1,000 meters. The development of th...

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Problems solved by technology

The advantage of the conventional construction method is that it is mature and reliable. You can refer to the successful experience of the cable-stayed bridge that has been built. The disadvantage is that the steel beams of the main span must be stretched at the same time as the corresponding cable-stayed cables, and the cable-stayed cables are anchored on the top of the main tower. Therefore, the steel girders must be erected after the construction of the main tower is completed, that is, the tower beams cannot be constructed simultaneously, and the construction time is long

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