Short-brace rod type expanding-chord truss and producing method thereof

Abstract

The present invention is one new kind of short stay rod type tension string truss. The shuttle-shaped truss has serial short stay rods connected rigidly to the nodes in the lower string; shaft bracket with bearing and shaft fixed to the lower ends of the short stay rods, steel cable pressed on the shaft and with two ends fixed to the end seat nodes separately of the shuttle-shaped truss while in its tensile state. There are arced notch in center of the shaft for the steel cable to contact with, and reinforcing boards between the short stay rods and the shuttle-shaped truss and between the short stay rods and the shaft bracket. The short stay rods are 0.3-2.0 m long. The present invention has the advantages of less steel consumption, simple structure, low cost, high performance, easy construction, etc.

Description

Technical field: [0001] The invention relates to a novel short-strut type tension string truss and a manufacturing method thereof, belonging to the technical field of long-span tension string trusses. Background technique: [0002] In the past ten years, there have been more and more buildings with steel structures as the main body in my country. Among them, in large public buildings such as air show buildings, exhibition centers, and dry coal sheds in industrial buildings, the planar form of the buildings is mostly rectangular. For The long-span rectangular planar roof often adopts the tube truss structure and string beam structure. The tube truss structure generally refers to the planar or spatial tube truss structure of the "pseudo-beam" stress system, such as the tube truss structure (column network 18m x 54m) used in the second phase project (135m x 174m) of the Shenzhen Airport Terminal Building, Nanjing The International Exhibition Center (94m×273m), Wenzhou Conventio...

AI Technical Summary

Problems solved by technology

Although the "string beam structure" in the prior art has many advantages, there are still several problems as follows: 1. The upper arc-shaped arch beam or arc-shaped truss causes superposition of section compressive stress. In order to strengthen the bearing capacity and structural rigidity of the string beam, Only by increasing the cross-sectional area of ​​the upper arched box-shaped steel beam and the lower steel cable, the amount of steel used is increased; 2. The strut is connected to the upper arched box-shaped steel beam with a shaft hinge, and the lower steel cable is passed through a high-strength bolt clamp by a cable ball Tight spherical joint connection, complex structure, increases the cost of manufacturing and processing the structure, and increases the cost; 3. The long struts arranged in parallel are 6m to 12m, which hardly contributes to the shear stiffness of the structure, and its shear stiffness is only It is borne by the box girder web or the arch web, and the shear stiffness is low; 4. The construction is complicated, and the construction process cost is high. It must be formed on the ground first, and then hoisted; 5. In areas with large wind loads or typhoon areas , the roof truss forms a negative pressure opposite to the node load, and the wind suction causes the cable pull force at the lower part of the string beam to lose, its self-balancing system does not exist, and the safety deteriorates. Without losing stability, this will increase the amount of steel used and increase the cost

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