Key points of quality control of steel structure

Installation precision control: complex space steel structure should be measured and controlled in the installation, because the steel structure construction measurement control as a part of the construction technology, the rationality of its engineering construction scheme, advanced, from a large number of measurement and control data information analysis results and get reaction and confirmation. For the long-span steel structure, the deformation and stress state of the structure are very different from that after forming in the construction process, so it is necessary to use all kinds of supporting brackets to ensure the accuracy of the structure.

Disassembly control: because of the large span steel structure with unloading tonnage, unloading point distribution is wide, single point unloading force is large, unloading calculation and analysis of large workload, if the support force release is not reasonable, will destroy the structure or make the scaffold gradually unstable. Therefore, the unloading of steel structures must be carried out in strict accordance with the requirements of equal ratio method and equal distance method in accordance with the principle of system transformation scheme, the basis of structural calculation and analysis, the purpose of structural safety, the core of deformation coordination, and the protection of real-time monitoring.

Lifting scheme: large span steel girder hoisting, if not reasonable lifting point calculation, still choose traditional two segments, due to the steel structure is longer, lifting point spacing is bigger, and the factors such as weight and variable load, axial force of the steel beam and wire rope are very big, prone to beam lateral bending, or even more serious deformation. The construction site of long-span steel structure should strengthen the management and increase the professional knowledge training of workers, so that they can have a more concrete understanding of the mechanical characteristics and hoisting knowledge of members. At the same time, strengthen the construction organization design to carry out a reasonable demonstration of the lifting scheme, in order to choose a more reasonable lifting scheme.

Installation sequence: Due to the high requirements on installation sequence of long-span steel structure, if the installation sequence is not properly considered and the steel components do not meet the needs of lifting, the safety of the structure may be affected. Construction organization design, should be reasonable arrangement of the installation sequence, factory processing, component transportation, site installation should be unified, in the construction process, strict implementation. In addition to carefully formulating the installation sequence suitable for the project, experienced construction teams should also be choosed for installation to avoid quality risks.