A compact cable-stayed steel anchor beam and its construction method

Abstract

The invention discloses a compact stay cable steel anchor beam and a construction method thereof. The steel anchor beam comprises a steel straining beam mechanism, beam end steel anchoring mechanisms and a stay cable anchor head bearing mechanism, wherein the steel straining beam mechanism, the beam end steel anchoring mechanisms and the stay cable anchor head bearing mechanism are matched to form the novel stay cable steel anchor beam. The construction method comprises the steps of (1), assembling the steel anchor beam; (2), hoisting the steel anchor beam; (3), after the steel anchor beam is hoisted to the position, relieving and removing hoisting equipment and installing the steel anchor beam; (4), binding steel bars of a tower column, installing templates and pouring the tower column. The steel anchor beam is simple and compact in structure, convenient to construct, low in construction cost, high in safety and long in service life. The construction method has the advantages that construction is convenient, the construction cost is low and the construction efficiency is high.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of bridge components, in particular to a compact cable-stayed steel anchor beam and a construction method of the compact cable-stayed steel anchor beam. Background technique [0002] The anchor connection structure on the cable-stayed tower of the cable-stayed bridge is directly related to the normal work, safety and durability of the cable-stayed cable in the use stage, and is the focus of attention in the design of the cable-stayed bridge. The steel anchor beam is a commonly used anchor connection structure on the cable-stayed tower. The first application of the steel anchor beam is the Annacis Bridge in Canada, which was built in 1986. It was first used in Shanghai in 1991. Huangpu Jiangnanpu Bridge. The basic principle of the steel anchor beam is to separate and decouple the horizontal force and the vertical force by separately setting the steel tie beam connected horizontally ...

AI Technical Summary

Problems solved by technology

[0003] The structural system separates the steel girders and corbels, so that the steel girders can better share the main horizontal force of the stay cables, but it leads to the following deficiencies: 1) The vertical force is unreasonable

Regardless of whether it is a steel corbel or a concrete corbel, the vertical component force of the stay cable will generate a large bending moment at the root of the corbel connected to the side wall of the tower, especially the stay cable near the lower part of the tower column. The included angle of the tower column is small, and its vertical component force is much greater than the horizontal component force; when steel corbels are used, the shear connector embedded in the tower column needs to bear the large vertical shear force while bearing the vertical shear force. The advantages of tension and shear connectors are difficult to play; when using reinforced concrete corbels, in addition to structural reinforcement, a corresponding number of tensile reinforcement bars must be arranged on the upper edge of the corbel

2) Inconvenient construction

For reinforced concrete corbels, it is necessary to pour the corbels first, and then construct the steel beams. There have been cases where the upper segmental corbels were poured before the lower segmental steel beams were installed, resulting in the failure of the lower segmental steel beams to be installed; Although the corbel can be hoisted simultaneously with the temporary connection with the steel tie beam, there are many processes such as hoisting positioning, release of the temporary connection, and locking after construction is completed. The temporary sliding and locking device itself set between the steel tie beam and the corbel It also increases the difficulty of construction and greatly reduces the construction efficiency.

3) The economy is not good, the vertical structural height of the vertical stacking of corbels and steel tie beams is much greater than the height required for anchorage on cable-stayed towers, resulting in tower columns on bridge towers being much higher than actually required The height (generally 35% higher), material and construction costs all need to be increased to meet the needs of the space structure, reducing the economy of the bridge

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