Multi-connection and multi-span continuous steel truss girder bridge and construction method thereof

Abstract

The invention relates to a multi-connection and multi-span continuous steel truss girder bridge and a construction method thereof. The multi-connection and multi-span continuous steel truss girder bridge comprises a plurality of height-variable trusses, wherein the tail parts and head parts of the height-variable trusses are connected into a row, the upper part and lower part of each height-variable truss are respectively connected with an upper horizontal and longitudinal connection and a bridge surface, and the lower end of the bridge surface is fixedly connected with a plurality of bridge piers. The construction method comprises the following steps of preliminary work, building of the bridge piers, building of a top pushing splicing platform, jacking and pushing of the height-variable trusses, suspension and splicing of the height-variable trusses, paving of a worker walkway, cleaning of site, and completion. The multi-connection and multi-span continuous steel truss girder bridge and the construction method have the beneficial effects that the structure stress of the height-variable trusses is reasonable, and the steel consumption amount is reduced; by adopting the integral and splicing type node mixing structure, the splicing is simple; by adopting multiple main trusses, the transverse stress is reasonable; by arranging the worker walkway and a refuge platform in a gap between the main truss components, the truss width is effectively reduced, and the steel consumption amount is reduced; by adopting the multi-connection synchronous jacking, pushing, suspension and splicing combined construction method, the influence on the spliced jacking and pushing process of original connection caused by the new connection of splicing is avoided, the jacking and pushing quality is improved, the difficulty in synchronizing is decreased, the efficiency is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a multi-link multi-span continuous steel truss bridge and a construction method thereof. Background technique [0002] The steel truss bridge can be regarded as a structural form in which the solid-web steel plate girder bridge is hollowed according to certain rules. The structure as a whole is a beam-bearing mode, that is, a structure that mainly bears bending moments and shear forces. Steel truss bridges are composed of truss members. Steel truss bridges are mainly subject to bending and shearing, but each truss member mainly bears axial force. Compared with the solid web beam, the whole web plate is replaced by sparse web members, so as to save steel and reduce the self-weight of the structure, and because the steel consumption of the web bar is less than that of the web plate of the solid web beam, the steel truss girder can be made more Large height, so it has gr...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing continuous steel truss bridge has high requirements on materials and welding technology, and is prone to flaw detection and fatigue; it is difficult to assemble, the bridge width is large, and there are few passage lines; rivers with low navigable grades usually need to be raised Bridge deck: the mass of jacking is large, the synchronization of jacking is difficult, and the efficiency of steel girder erection is low

Images