Construction method of large-scale parallel flexible lower-cord combined trusses

Abstract

The invention belongs to the field of construction of steel structure trusses, and particularly relate to a construction method of large-scale parallel flexible lower-cord combined trusses. The construction method comprises the following steps: (1) assembling upper-cord layers of trusses by sections, and abutting overhead, wherein the trusses need to be arched in advance according to the deformation design in the process of assembling; (2) installing lower-cord web members and lower-cord panel points independently after finishing assembling the trusses of the upper layer; (3) measuring the actual installation spacial distances among the lower-cord panel points, and determining the initial installation geometrical lengths of flexible lower cords; (4) installing all flexible steel pull rods connected in parallel among all spans of the lower cords, and then pretightening the steel pull rods of the lower cords uniformly; and (5) grading synchronously and unloading equally proportionally by using a support frame. By adopting the construction method provided by the invention, the construction difficulty of tensioning the internal force of the lower cords of the ultralarge-scale parallel flexible trusses initiatively can be solved. The construction method has the advantages of high construction efficiency and good economic benefit.

Description

technical field [0001] The invention belongs to the field of steel structure truss construction, and in particular relates to a construction method of a large-scale parallel flexible lower chord composite truss. Background technique [0002] The spanning distance of long-span roofs is generally increasing, and today's ultra-long-span roofs have reached a spanning level of more than 200 meters. With the continuous breakthrough of the span, it will inevitably bring a series of new technical problems. What kind of material and what type of components should be used to bear and transmit the huge structural internal force caused by the long span, and how to ensure the actual bearing of this material or component? The force state meets the design requirements and so on. [0003] The lower chord uses multiple parallel-connected large-diameter high-strength steel tie rods to meet the huge internal force requirements of super-long-span trusses, but it also brings complex technical p...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a large-scale parallel flexible lower chord composite truss construction method to solve the problems of the difficulty in active tensioning of the flexible lower chord, how to ensure the uniformity of the internal force of the flexible member within the span, and the unreliable initial bearing capacity of the large-diameter flexible lower chord, etc.

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