Node design and structure of steel structure factory buildings: seamless steel pipe steel roof trusses are only one of the various types of seamless steel pipe structures. In single-sided steel structure factory buildings, seamless steel pipe steel roof trusses are mainly plane trusses. In industrial buildings, It is very common to choose space trusses for seamless steel pipe steel roof trusses. Tubular steel roof trusses and section steel structures have added a lot of changes due to the different connection methods, among which the most obvious is that the connection points of the tubular steel roof truss components are mostly connected by seamless steel tubes, which are widely used without gusset plates. The method makes the joint design and structure of the tubular steel roof truss different from the traditional fixed plate joint design and structure.

1. Although the interconnection of no-node plates can save the material of the nodal plates and reasonably simplify the node structure, the connection structure of the pipes is relatively complicated and requires high processing technology, while the interconnection of the plan view is very simple. In addition, it is very difficult to weld immediately connected, and the welding process standard is relatively high.

2. Design standards and structural requirements for immediate connection joints of seamless steel pipe steel roof trusses, application fields of geometric parameters of connection points in various steel structure workshops, and calculation methods of bearing capacity and joints.

3. The design scheme of the steel roof truss of the steel structure workshop should simplify and unify the connection point structure of the steel roof truss as much as possible, reduce the number of connection points, and the number of strong axes overlapping in the same connection point of the chord (plane truss) should not exceed 3.

4. The wall thickness of the seamless steel pipe steel roof truss and the bending member welded directly to the joint should not exceed 25mm. Otherwise, effective measures should be taken to prevent the relatively large tensile stress from causing lamellar deformation along the direction of the welding thickness of the bending member.

Although the seamless steel pipe steel roof truss has a certain advantage of saving construction steel compared with the portal steel frame, its unit price is generally slightly higher than that of ordinary aluminum profiles, and the diversity of production and manufacturing will weaken or offset this advantage. The design should take into account the constraints of various conditions, and control the engineering cost of the steel structure factory building within a certain range.

Some problems that need attention in the installation of steel structures

1. Before the construction of the steel structure, all prefabricated components should be inspected, such as the number of components, length, vertical angle, the middle size of the screw hole at the assembly connection point, etc., to see if they meet the design points; Make corrections on the ground and handle them properly.

2. Steel beams and foundations are generally connected by embedded bolts. Therefore, before assembling steel beams in the steel structure, it is necessary to check the size of the anchor bolts of the concrete columns, the length of the exposed basic surface, whether the design elevation of the top of the base meets the design points, and whether the concrete Whether the thread of the stud is damaged (generally, effective measures are taken during foundation construction).

3. When hoisting the steel structure, appropriate measures should be taken to avoid excessive bending and torsion deformation, and the corresponding contact position between the rope joint and the component should be padded with a backing plate to prevent the prefabricated component from being scratched.

4. After the steel frame structure is hoisted in place, it is necessary to fasten the rubber bearings and other connected prefabricated components in time to ensure the stability of the structure.

5. The hoisting of the entire upper structure can only be carried out after the next layer is in place and the components of the fixed support points are calibrated.

6. According to the hoisting and hoisting level of the on-site assembly machinery, the road surface is assembled into relatively large installation equipment, thereby reducing the workload of high-altitude operations.