Construction method for back cable-balancing single-side cantilever concreted beam bodies of slant-legged rigid frame bridges

Abstract

The invention provides a construction method for back-cable-balance single-side cantilever concreted beam bodies of slant-legged rigid frame bridges, which belongs to the technical field of bridge construction. The method comprises the following steps: A, pre-embedding corrugated tubes (1) and anchor plates in corresponding side spans (2) on abutments (8); B, pre-embedding the corrugated tubes (1) in the side spans (2), concreting the side spans (2), passing and stretching balance back cables (3) into the corrugated tubes (1) and temporarily locking the side spans (2) with the abutments (8); C, adopting movable suspended scaffolding (4) to concrete a middle span (6) from slant legs and a No. 0 block (5) to a span-middle cantilever-type subsection; and D, allowing the abutments (8) at two ends to simultaneously remove the balance back cables (3) after a middle-span closure section (7) is concreted. The method has the advantages of simple process, no need for large-sized lifting-balancing equipment, no limit to sites, high bridge quality, few construction brackets, low cost and applicability particularly to the construction of large-span slant-legged rigid frame concrete bridges in high mountains and deep valleys.

Description

technical field [0001] The invention belongs to the technical field of civil engineering bridges, and in particular relates to a construction method for back-cable-balanced unilateral cantilever pouring beams of oblique-leg rigid-frame bridges. Background technique [0002] The oblique leg rigid frame bridge is tall and straight in shape, light and beautiful, simple in structure, good in integrity, and has the advantages of continuous beam and arch bridge in force, so it has been applied in domestic highways and railways. [0003] There are two commonly used methods for the construction of oblique-leg rigid frame bridges. One is the bracket method construction. The construction of the entire beam body is completed by setting up the bracket vertical formwork. It is characterized by low equipment requirements, but high site requirements, which affect traffic; the second is The method of construction without support, after horizontal rotation or vertical rotation, the girder bo...

AI Technical Summary

Problems solved by technology

[0003] There are two commonly used methods for the construction of oblique-leg rigid frame bridges. One is the bracket method construction. The construction of the entire beam body is completed by setting up the bracket vertical formwork. It is characterized by low equipment requirements, but high site requirements, which affect traffic; the second is The method of construction without support, after horizontal rotation or vertical rotation, the girder body cantilevered by hoisting and balancing equipment such as cable towers, is characterized in that no support is required or only a small amount of support is required, and it can adapt to harsh terrain conditions without affecting navigation or traffic. There are many hoisting and balancing equipment, and the requirements are high

[0004] The disadvantage of the traditional oblique-leg rigid frame bridge construction method is that it needs to erect brackets or install balance hoisting equipment, requiring sufficient space, and the erection and removal of brackets or balance hoisting equipment will delay the construction period and affect the traffic in the bridge crossing area

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