Asymmetric cable-stayed bridge side span section ground anchor prestress equivalent counterweight system and construction method

Abstract

The invention discloses an asymmetric cable-stayed bridge side span section ground anchor prestress equivalent counterweight system, and aims to solve specific technical problems that an asymmetric single-tower double-cable-plane cable-stayed bridge is short in side span and a cable bent tower bears unbalanced force due to the fact that main span beams and side span beams are different in length.The specific construction method comprises the steps that when the main beam is constructed, the stay cables are anchored in the rock stratum soil under the beam block at the same position in the vertical direction after side span, certain prestress is applied to the ground anchor, a prestress anchoring system can be directly pre-buried at the auxiliary pier in the construction process, and a novel equivalent balance weight structure system is formed. The structure has better economical efficiency, is convenient to construct and safe and reliable in structure, reduces the counterweight concrete material of the side span section of the traditional asymmetric cable-stayed bridge, and overcomes the defect of complex design and construction of a large temporary support for construction.

Description

technical field [0001] The invention relates to the technical field of foundations in civil engineering, bridge hydraulic structures and construction methods for the foundations, in particular to a ground anchor prestressed equivalent counterweight system and a construction method for side-span sections of asymmetrical cable-stayed bridges. Background technique [0002] The cable-stayed bridge is a long-span structure, and different layout methods can be adopted for different geological and terrain conditions. Generally, the cable-stayed structure is arranged in a symmetrical straight line, and the load transmitted by the bridge deck can be balanced by the tower girder; but for the single tower foundation setting under special geological conditions, the convenience of construction and other factors must be considered, and the cable-stayed bridge is often set as an asymmetric cable-stayed bridge. cable structure system. [0003] The design of the asymmetric cable-stayed stru...

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Problems solved by technology

[0003] The design of the asymmetric cable-stayed structure system generally considers the counterweight of the side span, that is, the main girder of the side span adopts a concrete structure, the main span adopts a steel structure, and the conventional construction adopts an auxiliary temporary support system for concrete pouring, which has a long construction period and a large working area. The stress of the side main span under self-balancing conditions increases the difficulty of design and the complexity of checking calculation of cable-stayed bridges

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