Construction method for concrete-filled steel tube arched bridge with large low-buckle tower erection bridge width

Abstract

The invention discloses a construction method for a concrete-filled steel tube arched bridge with a large low-buckle tower erection bridge width. In order to solve the problems of structure safety and concrete cracking risks in a chord in a construction process of performing cable-stayed buckling and hanging on a low-buckle tower of a large-span concrete-filled steel tube arched bridge, in the construction method, in the process of performing the cable-stayed buckling and hanging on a steel tube arch rib, the front-end control point of an arch rib segment, close to 1 / 2 to 3 / 5 of the length ofan arch foot section, of the arch rib is put in place by adopting the elevation with the downward allowable deviation which is less than the upward allowable deviation; after the steel tube arch rib is folded and before concrete is poured in the chord of the arch rib, a buckle rope and an anchor rope are loosened and removed; and spandrel building construction of the arched bridge is performed symmetrically from the arch crown to the two banks in classifications and strips. By the construction method, not only the security risk of a construction process structure is effectively reduced and the high quality and high precision reach the designed goals of arched bridge alignment and internal force, but also the workload of adjusting the buckle rope and the anchor rope is reduced, construction organization of the spandrel building is performed orderly and reasonably, and the construction cost is saved.

Description

technical field [0001] The invention relates to the field of construction methods for long-span concrete-filled steel pipe arch bridges, in particular to a construction method for erecting steel pipe concrete arch bridges with relatively large bridge widths with low buckle towers. Background technique [0002] The cable-stayed buckle-hanging construction method, which uses steel strands as buckle cables and anchor cables (or back cables, balance cables), and uses jacks for tension control, has been used in the cable industry since it was first used in Suining Yongjiang Bridge in 1995. It has been widely used in the erection of arch bridges in hoisting construction [1-5] . [0003] At first, in order to avoid mutual interference between the buckle tower and the pendant tower and the calculation of the force, the pendant tower and the buckle tower were set separately. With the advancement of calculation and analysis technology, in order to give full play to the material prop...

AI Technical Summary

Problems solved by technology

However, the low buckle tower will inevitably make the horizontal inclination angle of the buckle cable in the section near the vault small, which will have a greater impact on the stress of the structure at each stage of construction

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