Super-large span variable section double-layer and three-layer prestressed rib beam type net rack and making method

Abstract

The invention discloses a super-large span variable section double-layer and three-layer prestressed rib beam type net rack and a making method. The super-large span variable section double-layer and three-layer prestressed rib beam type net rack comprises a net rack (1), wherein the net rack (1) consists of double layers of rightly placed quadrangular pyramid trusses (2), and three layers of rightly placed quadrangular pyramid trusses (3) are arranged at about one third position of each side of the net rack (1) in the x direction and the y direction; and prestressed steel cables (4) are arranged on the three layers of rightly placed quadrangular pyramid trusses (3). A novel structural form is provided for the field of super-large (L is more than or equal to 120m and less than or equal to 180m) span space steel grid structures, the defect of over high consumption of steel for the conventional super-large span steel grid structure is overcome, the design requirements for 'safety, reasonability, advance and economy' are met, and the net rack is simple in construction and strong in operability; and compared with the conventional super-large span steel grid structure, the net rack has the advantages of greatly reducing the consumption of the steel and reducing the manufacturing cost of engineering.

Description

technical field [0001] The invention relates to a large-span roof structure, in particular to a super-large-span (120m≦L≦180m) double-layer and three-layer prestressed rib-beam grid frame with variable cross-section and a manufacturing method, belonging to the technical field of building steel structures. Background technique [0002] There are as many as 12 types of flat steel grid structure commonly used at home and abroad. The rectangular pyramid steel grid structure is the most widely used due to its good structural rigidity, but the application span is generally between 18m and 60m. When the span is greater than 60m , in order to reduce the calculated length of the oblique web, a three-layer flat grid is used, but the span L=120m~180m and other large spans, the three-layer flat grid is not economical, nor is it the best structural form. The ultra-large-span steel grid structures that have been built or are still under construction, such as the "Bird's Nest" stadium in t...

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Problems solved by technology

The ultra-large-span steel grid structures that have been built or are still under construction, such as the "Bird's Nest" stadium in the capital, the Beijing-Shanghai high-speed railway station buildings, such as "Tianjin West Railway Station" and Yujiapu station buildings, are all steel with a span of L≥100m Mesh structure roofs, the steel content of these roof structures w≥250kg / m 2 , That is, every four square meters of construction requires one ton of steel, and the project cost is expensive, which cannot meet the design requirements of "safety, rationality, advanced and economical"

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