Construction method of a super-long upward convex hybrid arch shell open-close roof structure

Abstract

The construction method of the super-long upward convex hybrid arched arch shell structure of the present invention belongs to the field of arched arch shell structures in long-span space structures. Composed of reticulated shells, the cables are set upwards, and the tensioned steel rods are between the arch shell and the cables. At the same time, the arch shell is an openable roof structure, and the length direction of the roof structure is as long as 252m. During the construction of the roof structure, there are 3 assembled platforms. After each 3 panels are assembled, first slide out 500mm to install the cable and initially tension it. The initial tension of the cable controls the horizontal displacement of the arch shell to close to zero, and then slides The installation of the next roof is carried out 6m away, and the sliding sequence is carried out from the assembly platform to both sides, and this is repeated, and finally the installation of the entire roof structure is completed by filling the vacancy at high altitude. The deviation between the actual value and the calculated value of the stress of the cable after tension forming is controlled within ±10%. The method greatly shortens the construction period and improves work efficiency.

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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