Corrugated-steel-web-composite-beam-form-cable-tower-beam connecting system and construction method

Abstract

The invention provides a corrugated-steel-web-composite-beam-form-cable-tower-beam connecting system and a construction method. A corrugated-steel-web beam serves as a cable tower beam, and replaces an original reinforced-concrete-form beam, the bending tensile resistance of the cable tower bam is improved, transverse connection between cable towers is enhanced, and the material performance of steel is fully developed; the dosage of longitudinal bending-resistant reinforcing steel bars and the dosage of concrete in the original reinforced concrete beam can also be decreased, and the structuraldead weight is reduced; prestress is applied with the external prestress technology, the utilization rate of materials is increased, the structural wholeness is enhanced, and concrete cracking is effectively avoided; a web, a top-face steel plate and a bottom-face steel plate are integrally connected through local welding, the engineering quantity of welding is decreased, construction is convenient, and economies are high.

Description

technical field [0001] The invention relates to the field of structural design of corrugated steel web composite girders, and in particular designs a cable tower beam in the form of corrugated steel web composite beams applied to the connection structure of cable towers of cable-stayed bridges and a specific construction method. Background technique [0002] During the construction of a cable-stayed bridge with a small radius of curvature, the main girder is on a flat curve with a radius of 800m. When the cable-stayed cables are stretched, the cable tower will be displaced to the inside of the curve. The lateral displacement of the two tower columns will cause the deformation of the beam of the cable tower, which will further cause a large tensile stress at the position of the top and bottom plates at the end of the beam. Excessive tensile stress will lead to cracking of the tower beam. Although the code allows cracks in reinforced concrete members, considering that the ext...

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Problems solved by technology

Excessive tensile stress will lead to cracking of the tower beam

Although the code allows cracks in reinforced concrete members, considering that the external conditions of the cable tower beam in the actual bridge construction and operation state are relatively complex, and there are many influencing factors, there will be steel corrosion and concrete freeze-thaw damage after long-term operation.

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