Large-span flexible steel beam pushing construction method based on stay cable assistance

Abstract

The invention discloses a large-span flexible steel beam pushing construction method based on stay cable assistance, and relates to the technical field of bridge construction, the method comprises thesteps that an assembling platform and a plurality of temporary buttresses are arranged in a bridge construction area, and walking type pushing equipment is installed on each temporary buttress; assembling a guide beam, a steel beam and a tower frame on the assembling platform in sections, hanging and tensioning stay cables, and enabling the top of the tower frame to deviate backwards for a certain angle through different initial tensions of the front cable and the rear cable; the walking type pushing equipment is started to push the steel beam and the guide beam forwards until the front end of the guide beam spans the maximum span and is located on the front temporary buttress, the stay cable is released, and at the moment, the tower does not enter the maximum span; continuously assembling and jacking the steel beams, and disassembling the buckle cable tower at a preset position; and after the steel beam reaches the designed position, the guide beam is dismounted in a segmented mode,and the steel beam falls in place. The stress of the steel beam and the guide beam in the maximum cantilever state and the deflection of the front end of the guide beam are reduced.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a method for jacking construction of large-span flexible steel beams assisted by stay cables. Background technique [0002] At present, due to the advantage of not interrupting the traffic under the bridge, the bridge jacking method is more and more widely used in projects spanning existing railways, highways and waterways. [0003] During the jacking construction of municipal bridges spanning urban natural moats such as railway marshalling yards, the span of jacking is relatively large due to the impossibility of setting temporary supports in the middle of marshalling yards. The span limit of the steel beam itself in the beam, in this case, it is easy to cause the stress of the steel beam and the guide beam and the deflection of the front end of the guide beam cannot meet the demand. Contents of the invention [0004] Aiming at the difficulties existing in the pri...

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Problems solved by technology

[0003] In the process of jacking construction of municipal bridges spanning urban natural moats such as railway marshalling yards, the span of jacking is relatively large due to the impossibility of setting temporary supports in the middle of marshalling yards. The span limit of the steel beam itself in the beam, in this case, it is easy to cause the stress of the steel beam and the guide beam and the deflection of the front end of the guide beam to fail to meet the requirements

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