A jacking construction method for large-span flexible steel beams based on stay cables

Abstract

The invention discloses a large-span flexible steel beam jacking construction method based on the assistance of cable stays, relates to the technical field of bridge construction, and includes setting up an assembly platform and a plurality of temporary piers in the bridge construction area, and setting each temporary piers Install walking-type jacking equipment on the platform; assemble the guide beams, steel beams and towers in sections on the assembly platform, hang and stretch the stay cables, and pre-deflect the top of the tower backwards to a certain extent through the different initial tensions of the front and rear cables. Angle; start the walking jacking equipment to push the steel beam and the guide beam forward until the front end of the guide beam crosses the maximum span and is located on the temporary pier in front, then release the stay cable. At this time, the tower has not entered the maximum span; continue to assemble And jacking the steel beam, dismantle the buckle tower at the predetermined position; continue to assemble and jack the steel beam, when the steel beam reaches the design position, remove the guide beam in sections, and drop the beam in place. The invention reduces the stress of the steel beam and the guide beam and the deflection of the front end of the guide beam in the maximum cantilever state.

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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