Construction technology of tube truss structure

In order to meet the construction of modern long-span buildings, the combined giant steel tube truss is widely used in the building, the structure mainly takes large spiral welded steel tube as the main force member, and color steel tile as the main external covering structure of the roof and wall. For the closed material yard, the tube truss structure has obvious advantages over the space frame structure from the aspects of material procurement, production and installation, and later maintenance.

Compared with the steel truss with open section (H-shaped steel and I-shaped steel), the section of tube truss is more evenly distributed around the neutral axis, which makes the structure has good compressive, flexural and shear resistance and greater stiffness. At the same time, the tube truss structure does not need to add node plates, simple structure, convenient production and installation.

Select appropriate welding materials, methods and parameters. Welding process evaluation shall be based on reliable welding performance. Welding process assessment Verify the correctness of the welding process proposed by the construction unit, and assess the capacity of the test welding unit. The equipment and instrument used for welding process evaluation shall be in normal working condition, and the steel and welding materials shall meet the corresponding standards. In the non-destructive testing of welding, the weld form of the joint part of the tube truss is complex, and the welding position is changeable. For a tubular mouth, there are three kinds of welding positions, including flat, vertical and upward, and three kinds of groove angles. Therefore, strict testing measures must be taken for welding to ensure the quality of welding. For trusses, there are many belly bars, and the welds at the joint parts are dense and there are many junction points. If no measures are taken, the shrinkage of the welds will have an impact on the arch height loss.

During the entire lifting process, the hook and pulley sets of the two cranes should be maintained in a vertical state. The lower chord of the tube truss is tied with a rope to control the swing of the tube truss during the hoisting process to avoid collisions with the boom of the crane and other surrounding facilities.