Long-distance pushing construction method of thee-main-truss steel truss beam in single-connection and double-span modes without guide beam

Abstract

The invention discloses a long-distance pushing construction method of a thee-main-truss steel truss beam in single-connection and double-span modes without a guide beam, and relates to the field of bridge construction. The method comprises the steps of setting up an assembly support and supporting brackets beside piers, and mounting slide way beams, steel strand anchoring devices and horizontal deflection correction devices. After steel connection truss beams are assembled on the assembly platform, top steel truss beams are arranged on the supporting brackets beside the piers, the upstream and the downstream of the tail end of each steel truss beam are respectively provided with a horizontal continuous jack anchoring counter-force support, steel strands penetrate through the counter-force supports for pre-tensioning, and horizontal jack debugging is carried out. A jack is vertically ejected, a sliding lock is dragged to a designed position and then the jack falls down to start pushing, after pushing between sections is finished, the jack is vertically ejected, the sliding block is moved backwards to a section until the designed position and then the jack falls down, and the action is repeated. Cost of horizontal continuous jacks, vertical falling jacks and control device of the jacks can be reduced, temporary connection and guide beam expense between a large number of steel truss beams and joints is eliminated, the pushing construction of the long-distance steel truss beams is accurately controlled, construction is quick, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a long-distance jacking construction method for single-connected double-span steel truss girders with three main trusses and no guide girders. Background technique [0002] With the rapid development of my country's economy, more and more projects need to be constructed, and there are more and more bridges with steel truss girder structures, and the requirements for construction safety, quality, and progress are getting higher and higher. High-quality, high-quality infrastructure requirements. At present, the erection of steel truss beams is generally carried out in pieces, and large temporary facilities such as piers in the water and trestles need to be installed, which is not conducive to the protection of shipping and the environment, and also increases the construction cost and construction period. For the jacking construction of long-span and long-connected steel truss gir...

AI Technical Summary

Problems solved by technology

At present, the erection of steel truss girders is generally carried out in pieces, and large temporary facilities such as piers in the water and trestles need to be installed, which is not conducive to the protection of shipping and the environment, and also increases the construction cost and construction period.

For the jacking construction of long-span and long-connected steel truss girders, a guide girder is generally set at the front end of the steel truss girder to reduce the weight of the cantilever section at the front end, improve the stress conditions and the conditions for the upper pier, and at the same time set a complete set of horizontal girders on the top of each pier pier. , Vertical jacks, to complete the horizontal jacking movement and vertical lifting of the steel truss girder, a large number of horizontal and vertical jacks and synchronization and deviation correction control measures are required. Partial failures will affect the jacking construction of the entire steel truss girder and affect the construction. schedule

For the construction of multi-span and multi-connection steel truss girders, generally, each span and each connection of steel truss girders are connected with temporary members to form a long connection for cantilever assembly or push construction, which requires a large number of temporary connections between the connection Rods and guide beam rods consume a lot of manpower, material resources and financial resources

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