Construction method for steel-concrete combined section of deck type steel box continuous arch bridge

Abstract

The invention discloses a construction method for a steel-concrete combined section of a deck type steel box continuous arch bridge. The steel-concrete combined section of the deck type steel box continuous arch bridge is characterized by comprising a cylindrical pier column, a variable cross-section steel-concrete combined section and steel box arch feet. The steel-concrete combined section is vertically mounted on the cylindrical pier column; and the steel box arch feet are embedded into the steel-concrete combined section. The construction process comprises the following steps of mounting pier column erecting steel bars and stirrups, pre-burying steel strands and mounting a pier column template, mounting four arch foot positioning steel plates, pouring concrete at the lower part of the pier column in a layered manner, erecting a pier column outer side bracket, hoisting the arch feet and positioning, mounting shear reinforcements, mountingstress and strain sensors and a temperature sensor, mounting a steel-concrete combined section stirrup, embedding a cooling pipe, mounting a steel-concrete combined section template, positioning a tensioning end of a steel strand, pouring steel-concrete combined section concrete, performing prestress tensioning and grouting on an arch foot, and pouring concrete at the upper part of the arch foot after an arch rib is mounted. The self-weight of the upper structure and the use amount of concrete of the pier column are reduced, but a large stress concentration phenomenon can be generated; and displacement of the arch feet caused by uneven external force is prevented, and construction is convenient.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for a steel-concrete joint section of an upward-supported steel box continuous arch bridge. Background technique [0002] The unbalanced thrust accumulated by the dead load of the span to each side pier cannot be ignored in the design and construction of the bridge pier. In order to resist the unbalanced thrust of the arch foot caused by the self-weight of each hole and the accumulated temperature force of the super-long joint, the steel box arch foot and the concrete pier are consolidated to form a steel-concrete joint section. The structure of the steel-concrete combination section is mainly based on the force of the steel arch foot, and the concrete wraps and fills the arch foot segment. Make it an integral structure, and assist the steel arch feet to bear the force, so that the load borne by the upper structure of the bridge can ...

AI Technical Summary

Problems solved by technology

[0006] The arch foot of the arch bridge will generate horizontal thrust, which has high requirements on the foundation, especially the horizontal thrust of each arch foot of the porous continuous arch bridge will affect each other, so the multi-arch bridge cannot be used normally in places where the shear resistance of the foundation foundation is weak obstacle

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