Mounting method of cable supported structure diagonal braces

Abstract

The invention relates to a mounting method of cable supported structure diagonal braces. A cable supported structure comprises telescopic connection joints, wherein the telescopic connection joints are designed at the ends of the diagonal braces by using the diagonal braces and comprise the diagonal braces, liner pipes and jacking racks. The mounting method specifically includes the steps of firstly, after inhaul cable tensioning is completed, mounting the long-section diagonal brace; secondly, mounting hydraulic jacks between a sealing plate and the jacking racks; thirdly, using the hydraulicjacks to jack the diagonal braces to original design length; fourthly, welding the diagonal braces to the liner pipes through slots; fifthly, uninstalling the hydraulic jacks; sixthly, mounting the diagonal braces with ends of a two-semicircle shape, and welding the diagonal braces with the mounted diagonal braces and the sealing plate. The mounting method is efficient and convenient in construction and capable of effectively reducing the influence of diagonal brace mounting on the construction period.

Description

technical field [0001] The invention relates to a method for installing a diagonal brace of a cable-supported structure, which is also applicable to construction projects that require expansion and contraction adjustment, and belongs to the technical field of building steel structure construction. Background technique [0002] In recent years, with the increasing social demand for long-span buildings, many new space structures have emerged; cable-supported grids, as a new type of hybrid space structure combining rigidity and flexibility, are more and more popular due to the advantages of stable force and small steel consumption. More and more applications, especially in large stadiums. In order to obtain a larger overhang space during the design of the cable-supported structure, a diagonal brace along the overhang direction is generally designed at the end of the cable body to support the upper grid on the lower cable body. [0003] The installation of the cable-supported s...

AI Technical Summary

Problems solved by technology

When the cable-supported structure only has radial cables, if diagonal braces are installed before tensioning construction, the diagonal braces, vertical braces and roof members between them will form a triangular stiffness area, which will offset the large Part of the tension force cannot effectively establish the prestress in the structure; if the cable-supported structure has not only radial cables but also hoop cables, since the cables are in a relaxed state before tensioning, the installation position of the hoop cables must be offset in the direction of radius reduction. This determines that the radial diagonal struts cannot be installed at the same time, but can only be installed after tensioning. In addition, the triangular stiffness area problem also exists when the diagonal struts are installed first.

[0004] In view of the above reasons, the diagonal brace can only be installed after the cable is stretched, but after the cable is stretched, the middle part of the upper structure will be deflected, resulting in insufficient installation space for the diagonal brace and difficult construction

There are two conventional installation methods: one is to jack up the structure on the support frame near the connection position of the corresponding diagonal strut in the upper structure, and plug the diagonal strut; since both ends of the diagonal strut are generally pin connection nodes, the installation High spacing accuracy is required; for the above installation method, firstly, the jacking height is not easy to control, requiring multiple measurements and multiple jacking attempts, and secondly, the construction efficiency is low and the construction cost is high

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