Staged tensioning method for arch support opposite-pull rods of continuous arch bridge

Abstract

The invention provides a staged tensioning method for arch support opposite-pull rods of a continuous arch bridge, which comprises the following steps that embedded pipes used as opposite-pull rod holes are embedded in corresponding arch feet of arch supports, opposite-pull rods are arranged in the embedded pipes, and two ends of each opposite-pull rod are respectively connected with two adjacentarch supports; before a single-span arch ring is poured, the opposite-pull rods are pre-pulled to be tensioned to a first preset value; after the single-span arch ring is formed and before an arch structure of the single-span arch ring is constructed, the opposite-pull rods are loaded and tensioned to a second preset value, wherein the opposite-pull rods can be tensioned according to multiple stages of preset values, the preset values are increased stage by stage, and the difference value between every two adjacent stages of preset values meets the controllable requirement of the middle arch support in the action of the single-span arch ring. The opposite-pull rods are tensioned step by step according to the horizontal thrust on the arch support in different construction stages, unbalancedhorizontal thrust borne by the arch support in different construction stages can be effectively offset, unbalanced deformation of the arch support in the construction process is avoided, and the structural stability of the arch ring is guaranteed.

Description

Technical field [0001] The application relates to the technical field of bridge construction, and in particular to a method for stepwise tensioning of tie rods for arch seats of continuous arch bridges. Background technique [0002] Arch bridge is a common type of bridge structure with a long history of development. With its beautiful line shape, good mechanical performance and excellent spanning ability, it is widely used in various bridge projects. Especially in the massive construction of highways, high-speed railways and other infrastructures, more and more arch bridges are favored by engineers and owners as spanning structures, and have been successfully applied to actual projects to achieve better economic and social benefits. [0003] During the construction of the arch ring and the upper structure of the existing arch bridge, the arch foot of the arch ring will produce an unbalanced horizontal thrust on the arch seat. In order to offset the unbalanced horizontal thrust gene...

AI Technical Summary

Problems solved by technology

However, in continuous arch bridges, arch rings are required on both sides of the same abutment, resulting in the construction of one of the arch rings, which will also generate unbalanced thrust on the abutment, which will affect the stability of the arch bridge structure, and there is a huge problem Security risks

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