Construction method for multi-span basket type arch bridge

Abstract

The invention discloses a construction method for a multi-span basket type arch bridge and belongs to the technical field of bridge constructing methods. The construction method for the multi-span basket type arch bridge comprises a construction preparation stage, an arch foot installation stage, a side span and cable tower synchronous installation stage, a subsidiary side span and middle span arch rib installation stage and a construction ending stage. Side spans are installed through a support method. Subsidiary side spans and a middle span are installed through a self-balancing buckling method. Further, a mechanical model for the whole construction process is established by use of finite element calculation software MIDAS CIVIL, so that mechanical analysis is conducted on each construction stage. According to the construction method for the multi-span basket type arch bridge, the self-balancing buckling method is created besides the adopted conventional support method; defects of an inclined pulling and buckling installation technique are overcome; anchor cable materials are omitted; large-scale temporary building amount is decreased; the construction face of bridge installation is further expanded; the working efficiency is improved; the construction method has a decisive effect for speeding up the construction progress; the construction cost is greatly lowered; and the construction method adapts to construction of large multi-span bridges.

Description

technical field [0001] The invention relates to the technical field of bridge construction, and more specifically, relates to a construction method of a multi-span basket arch bridge. Background technique [0002] With the increasing number of railway and expressway construction projects in our country, the demand for building large-span arch bridges and multi-span arch bridges is also increasing. At present, the construction methods of bridge construction are mainly support method, swivel construction method and cable-stayed buckle-hanging method. The engineering construction unit generally adopts the corresponding construction method or improves the existing construction method according to the specific needs of the engineering construction project and the geographical environment where the project is located. However, the traditional construction method has a large investment cost and is limited by the terrain of the construction site. , The construction area is small. ...

AI Technical Summary

Problems solved by technology

[0004] The installation of steel arch bridges using the more common cable-stayed buckle-hanging method not only requires a large number of steel strands as anchor cables, but also requires a strong rear anchor, which requires a very large investment.

However, there are still the following technical difficulties in the construction of multi-span basket arch bridges: the deformation control of the arch ribs of multi-span basket arch bridges is difficult during welding; the arch ribs and deck of multi-span basket arch bridges have many splicing joints, and the linear and corresponding point elevation control Difficulty; the construction site for building an island in the sea is narrow for ground assembly

The existing multi-span basket arch bridge adopts span-by-span buckle-hanging installation technology, which has a long construction period

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