Self-balancing cantilever construction method of long-span steel truss arch bridge and limit bearing of main pier

Abstract

The invention discloses a self-balancing cantilevering construction method for a large-span steel truss arch bridge. On the basis of additionally arranging temporary tie bars on traditional buckle and back stays, the temporary tie bars are omitted, and main pier limiting supports with horizontally adjustable supporting points are adopted to replace the traditional temporary tie bars for bearing the horizontal thrust applied by an arch ring during construction. A buckle and back stay system is not disassembled when a bridge deck system is assembled after closure of arch ribs so that the horizontal thrust of the supports can be reduced. By adjusting the horizontal displacement of the main pier limiting supports, the functions of the temporary tie bars are achieved, and control over the stress displacement of the bridge during the construction and stress-free closure of rigid tie bars are achieved. After the closure of the rigid tie bars, the buckle and back stay system is disassembled. Finally, the main pier limiting supports are disassembled step by step, and the rigid tie bars are stressed, and therefore system conversion is completed.

Description

technical field [0001] The invention belongs to a construction method of a steel truss arch bridge, in particular to a self-balancing suspension construction method of a steel truss arch bridge without temporary tie rods, and a space-limiting support for a main pier used in the method. Background technique [0002] For long-span steel truss arch bridges, after the arch ribs are closed and before the steel ties on the bridge deck are closed, temporary ties need to be installed to form a tie-arch system in advance, and the temporary ties are stretched multiple times to balance the horizontal thrust of the arch feet to achieve Control of stress-displacement of bridges during construction and stress-free closure of rigid tie rods. [0003] In order to avoid overly complicated structures and minimize the impact of temporary tie rods on the installation of bridge deck components, temporary tie rods are generally located at a node below the bridge deck. The hoisting will affect th...

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Problems solved by technology

[0003] In order to avoid overly complicated structures and minimize the impact of temporary tie rods on the installation of bridge deck components, temporary tie rods are generally located at a node below the bridge deck. The hoisting will affect the construction progress; at the same time, the temporary tie rods located below the bridge deck greatly reduce the navigation clearance height, which requires expensive waterway maintenance and management costs during the construction period, and even affects the bridge plan at bridge sites with high waterway level requirements. implementation; moreover, temporary anchoring measures need to be added to the temporary tie rods, resulting in a complex structure and waste of materials; as the construction progresses, the temporary tie rods need to be stretched multiple times at high altitudes, making construction control difficult

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