Installation and correction of steel structures

When correcting the frame, the laser theodolite must perform verticality observations in the frame standard according to the base point, and within the limits allowed when correcting the top of the steel column vertically. The frame stiffness correction is based on the actual center line at the top of the bracket as follows: The bottom of the steel column is based on the center line of the bottom steel column. Today, we'll take a closer look at the main project and the general project as we install and modify.

The steel structure must meet the design requirements, specifications and requirements of these process standards, and the deformation of parts and peeling of coating caused by transportation, loading and lifting must be modified and repaired.

Within the allowable installation deviation range of the struts, the relevant standards must be met. It is also necessary to comply with the allowable deviation diagram for vertical and lateral bending of steel main beams, auxiliary beams and compressed members. The contact surface of the top node required by the design should not be less than 70%, and the maximum gap of the edge should not be greater than 0.8mm. The allowable deviations for total vertical and total plane bending of multistory and high-rise steel structures must comply with the standard.

The surface of the steel structure must be clean, and the main surface of the structure can not have scars, silt and other dirt. The centerlines and floor reference points of major components (e.g. steel columns) must be perfectly marked. The allowable deviation of steel parts installation should meet the requirements. The full height allowable deviation of the body structure must comply with the regulations. When steel members are installed on concrete columns, the deviation between the center of the support and the position axis should not exceed 10mm. When large concrete roof panels are used, the deviation between the steel beams should not exceed 10mm. For multi-storey and high-rise steel structures, the following rules on the allowable deviation of weld group clearance must be observed: liner clearance 3mm deviation, liner clearance 3mm deviation, and -2mm gap.