Construction method of ultra-long convex string hybrid arch shell retractable roof structure

Abstract

The invention relates to a construction method of an ultra-long convex string hybrid arch shell retractable roof structure, and belongs to the field of string arch shell structures in large-span spacestructures. An arch shell is composed of an arch reticulated shell which is formed by hybrid oblique crossing and orthogonal crossing of rectangular steel tube profile steel, inhaul cables are arranged in an upward convex mode, tensioned steel pull rods are arranged between the arch shell and the inhaul cables, additionally, the arch shell is of an openable roof structure, and the length of the roof structure is as long as 252 m in the length direction. When the roof structure is constructed, three assembling platforms are arranged in total, every three assembling platforms slide out by 500 mm, the inhaul cables are installed and are initially tensioned, the inhaul cables are initially tensioned so as to control the horizontal displacement of the arch shell to be close to zero in the spandirection, then the inhaul cables slide out by 6 m so as to install the next assembling platform, the sliding is performed from the assembling platforms to both sides, the operation is repeated in this way, finally, high-altitude vacancy filling butt joint is performed so as to complete the installation of the whole roof structure, and the deviation between the actual stress value and the calculated value of the inhaul cables after tensioning forming is controlled within + / -10%. According to the construction method, the construction period is greatly shortened, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the field of stringed arch shell structures in large-span space structures, and in particular relates to a construction method for an open-close roof structure of a super-long upwardly convex stringed hybrid arch shell structure. Background technique [0002] In recent years, with the continuous and rapid development of my country's economy and culture, large-span prestressed steel structures have achieved unprecedented development, and many new structural forms and shapes have emerged, forming a variety of spatial structural systems with their own characteristics. The usual string beam structure is a structural system in which the upper chord is a rigid member, the lower chord is a flexible cable, and the middle is connected by a compressed strut. Its structural composition is a self-balancing system and a large-span prestressed space structure system. . The Zhangxian beam structure was first clearly proposed by Professor M.S...

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Problems solved by technology

[0003] At present, the lower chord cables of the roof structure in the form of tension beams are generally arranged in a concave form. The characteristics of this form of tension beam structure are: 1. The connecting vertical bars between the upper and lower chords are compressed struts, and the tension beams are used for large In the case of a span structure, the cross-sectional size of the middle strut is too large due to the control of the slenderness ratio of the compression rod; 2. Theoretically, the lower chord and the strut can rotate around the upper chord at any angle while achieving a force balance, especially Under the action of wind suction, the lower chord cables may change from tension to compression and withdraw from work, which will affect the overall stability of the structure; 3. The concave tension chord structure will occupy Larger building interior space, the internal line of sight will be hindered to a certain extent

[0004] With the theoretical analysis and experimental research on the long-span tension beam structure engineering built in recent years, some achievements have been made in configuration control and stability analysis, but there is no summary of the construction method of the tension beam structure, especially in the lower string beam structure. The research on the optimization of cable tension force, prestress tension control and tracking simulation of the whole construction process is not comprehensive enough, which makes the construction control theory of string beam structure lag behind the engineering practice

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