What are the quality control points of steel frame structure?

The steel frame structure has the advantages of high strength, light deadweight, high structural reliability, environmental protection, and reusability. With the construction of steel structure buildings getting higher and higher, the volume is getting larger and larger, and the application is becoming more and more extensive. The quality control of steel structures is particularly important. What are the quality control points of steel frame structure?

Installation accuracy control

The complex spatial steel structure shall be measured and controlled during installation. As the construction measurement control of steel frame structure is a part of the construction technology, the rationality and progressiveness of its construction scheme are analyzed from a large number of measurement and control data information, and the results are reflected and confirmed. For large-span steel structure, due to the great difference between the deformation and stress state of the structure during construction and that after forming, various support jig frames need to be used to ensure the accuracy of the structure.

Removing the control

Because the large-span steel frame structure has the characteristics of large total tonnage of unloading, wide distribution of unloading points, large unloading force at single point, and large workload of unloading calculation and analysis, if the support force is released unreasonably, the structure will be damaged or the scaffold will gradually lose stability. Therefore, when unloading the steel frame structure, the system conversion scheme must be taken as the principle, the structural calculation and analysis as the basis, the structural safety as the purpose, the deformation coordination as the core, the real-time monitoring as the guarantee, and the operation must be carried out in strict accordance with the requirements of the two unloading methods of the equal ratio method and the equal distance method.

Hoisting scheme

When hoisting large-span steel beams, the traditional two-point hoisting is still selected if the reasonable hoisting point calculation is not carried out. Due to the long steel beam structure, large distance between lifting points, self weight, variable load and other factors, the steel beam and steel cable are subject to great axial force, and are prone to lateral bending of the steel beam, or even more serious deformation. The construction site of large-span steel structure should strengthen management and increase the training of workers' professional knowledge, so that they can have a more concrete understanding of the stress characteristics of components and lifting knowledge. At the same time, strengthen the construction organization design to reasonably demonstrate the hoisting scheme, so as to select a more reasonable hoisting scheme.

Installation sequence

Due to the high requirements for the installation sequence of large-span steel structure, if the installation sequence is not reasonably considered and the steel members do not meet the needs of hoisting, the safety of the structure may be affected. During the construction organization design, the installation sequence shall be reasonably arranged. Factory processing, component transportation and on-site installation shall be coordinated in a unified manner. During the construction process, strict implementation shall be carried out. In addition to carefully formulating the installation sequence suitable for the project, experienced construction teams should also be selected for installation to avoid potential quality hazards.