Asymmetrical casting construction method of side span of rigid frame bridge with extra high piers and long span length

Abstract

The invention provides an asymmetrical casting construction method of a side span of a rigid frame bridge with extra high piers and a long span length. The asymmetrical casting construction method comprises the following steps that after each T-shaped structure of each main pier is symmetrically cast to have largest cantilevered ends in a suspended manner, a hanging basket on one side of the side span of each main pier is continuously moved forward, and an asymmetrical suspended casting segment is cast on the side of the side span in a suspended manner; when the asymmetrical suspended casting segments are constructed, cantilever brackets for 0# block construction of transition piers are directly adopted as side span cast-in-place brackets for constructing side span cast-in-place segments; after the casting of the side span cast-in-place segments is completed, the hanging baskets for constructing the asymmetrical suspended casting segments are put down and moved forward, front cross beams of bottom baskets of the hanging baskets are placed on the side span cast-in-place brackets, rear cross beams of the bottom baskets of the hanging baskets are suspended and hung on baseplates and flange plates of tank beams to be used as side span closing hanging baskets, and the casting construction of side span closing segments is performed; after the side span closing segments meet design requirements, the side span closing hanging baskets are detached, and the side span construction is completed.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for a side span of a rigid frame bridge with a superhigh pier and a large span. Background technique [0002] With the rapid development of highway traffic, highway rigid frame bridges, especially continuous rigid frame bridges with high piers and large spans, have been popularized and applied in the field of bridge engineering. According to the existing construction method of continuous rigid frame bridge with high pier and large span, the cantilever section adopts symmetrical cantilever construction, the side span cast-in-place section adopts support or cantilever bracket pouring, and the closing section adopts hanger construction. figure 1 Shown is a state diagram during the construction of a large bridge. At this time, the T-structure cantilever 2 of the main pier 1 has been cantilevered symmetrically to the maximum cantilever end. The subseq...

AI Technical Summary

Problems solved by technology

However, there are the following problems in the construction of the steel pipe support method: the height of the support is large, the overall deformation of the support is large, and the overall stability of the structure is poor; there are many assembly processes, the installation and disassembly are difficult, the investment in mechanical equipment is large, and the construction period is long; the foundation treatment of the support The investment cost of the support itself and the support itself are relatively large; and the use of the cantilever bracket method also has certain defects: due to the long cast-in-place section of the side span that needs to be constructed, it is necessary to use a super large cantilever bracket, which has poor overall stability and the structure itself Significant, high requirements for hoisting equipment

The counterweight device that eliminates the bending moment has a negative impact on the transition pier, and its force has a large deviation from the force of the transition pier in the bridge completion stage

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