I. Main process flow of steel truss assembly construction (applicable to steel structure supported by sightseeing elevator and frame glass curtain wall)

1. Steel tube truss members shall be numbered and transported to the site after they are manufactured in the factory.

2. Before assembly, the semi-finished components shall be inspected and accepted according to the requirements of relevant drawings, and shall be assembled and welded only after being signed by the site supervision engineer.

3, assembly welding must be carried out on a flat ground, and should be operated by professional workers. First of all, according to the serial number of the components when they leave the factory, the steel pipe truss is pre-assembled, and the size is checked before welding.

4. Effective measures should be taken during welding to avoid or reduce welding deformation and eliminate accumulated errors. After welding is completed, the weld shall be inspected and accepted according to relevant welding standards. The on-site supervision engineer shall be present at the time of acceptance and sign the acceptance opinions as the acceptance of the concealed works in the middle.

5, on-site welding process

Second, the steel pipe truss hoisting

1, steel pipe truss installation procedure

(1) Before hoisting the steel structure, the hoisting scheme shall be carefully determined and reported to the supervisor and the local safety supervision and management department for approval before hoisting. The hoisting scheme should be comprehensively considered and analyzed according to the height and weight of the steel pipe truss, and the hoisting equipment should be reasonably selected.

(2) Selection of hoisting mode of steel pipe truss: crane with high mobility is mainly used for hoisting, and winch is used for hoisting where crane cannot reach or construction is difficult, with the top main structure as the fulcrum.

(3) Before hoisting, call all personnel involved in hoisting for technical disclosure and safety disclosure, study and determine the hoisting sequence, discuss possible situations during hoisting and study solutions. At the same time, the division of labor, the implementation of relevant responsibilities, to determine the person responsible for the command.

(4) Before hoisting the curtain wall steel structure, the quality inspectors and technicians should check and number all steel pipe trusses to be hoisted, and check the positioning axis, plane convergent angle, plane position and elevation of embedded parts, concrete strength, overall dimensions of components, position and diameter of screw holes, position and angle of connectors, weld quality, studs and friction surface treatment, etc. Only after passing the inspection can the installation work be started.

(5) The installation of steel tube truss is the key to ensure the accurate positioning of hinge support. When positioning the hinge bracket, theodolite can ensure that the hinge bracket is on the same axis. After all hinge supports are positioned, check whether all hinge supports with * * * lines are aligned, and adjust the deviated hinge supports to ensure the accurate positioning of hinge supports.

(6) The mechanic should also check and maintain lifting equipment, lifting ropes, hooks and other machines and tools to ensure that the machines and tools are in good working condition and the protective equipment and instruments required for aerial work are fully prepared.

(7) When hoisting, a warning line shall be set up, and a special person shall be responsible for the warning. The hoisting operation shall be carried out in a certain order. Try to hoist the assembly first, and then formally hoist it after success. When hoisting steel pipe truss, traction rope should be set to control the swing during hoisting and facilitate the alignment and positioning of the truss.

(8) The positioning axis of each truss of curtain wall steel structure must be led up from the ground control line to avoid being led up from the axis of the lower column, so as not to cause excessive accumulation and errors. The installation and lifting point of steel structure must be calculated to prevent permanent deformation of components during hoisting.

(9) After the curtain wall steel structure installation, calibration, bolting and welding are all completed and qualified, the installation of another unit can be started. The components installed that day should form a spatial stability system to ensure structural safety. (10) Installation accuracy requirements: the difference of node space coordinates is 5 ㎜; The elevation difference of longitudinal assembling points of steel bars is1㎜; The length error of the bar is 65438 0 ㎜; The wall thickness error of bar is 0.5 ㎜.

2, lifting construction process flow chart

For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd