Steel Structure Processing

Steel Structure Construction Warehouse Installation Completed

The core of steel structure plant installation is "precision control + safety assurance": reduce hidden dangers through drawing review and component inspection in the early stage, ensure quality through standardized lifting and connection processes during installation, and take safety and acceptance standards as the bottom line throughout the process. Special attention should be paid to the safety of high-altitude operations, the reliability of bolt/welding connections, and subsequent anti-corrosion treatment (which directly affects the service life of the plant). Following the above points can effectively reduce the rework rate and ensure the safety and stability of the plant structure.

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The core installation link of steel structure workshop

Hoisting operation: safety and precision are equally important
Connection construction: key control of bolts and welding
Installation of roof and wall system

Hoisting plan: select a suitable crane (such as a truck crane or crawler crane) according to the weight of the component (such as steel columns can reach several tons) and the hoisting height, clarify the location of the hoisting point (must be consistent with the design to avoid deformation of the component), and conduct a trial hoist (10-30cm off the ground, check whether the hoisting equipment and ropes are balanced).
Hoisting sequence: generally install in the order of "steel column → roof beam → crane beam → purlin → support → enclosure structure" to avoid structural instability due to uneven load.
Temporary fixation: After the steel column is hoisted, it needs to be fixed with a cable rope or temporary support (at least 2 directions), and the verticality needs to be adjusted (deviation ≤H/1000, and ≤15mm, H is the column height); when hoisting the roof beam, both ends need to be in place simultaneously, and the hook should be loosened after temporary connection.
Bolt connection (mainly high-strength bolts):
Clean the debris in the bolt hole before installation to ensure that the bolt can be inserted freely (forcible knocking is prohibited. If the hole position deviation is large, the hole can be enlarged, but the diameter of the enlarged hole is ≤1.2 times the bolt diameter).
High-strength bolts need to be tightened twice: initial tightening (reaching 50%-60% of the designed pre-tension) → final tightening (reaching the designed pre-tension), and they need to be tightened in the order of "from the center to the surroundings" to avoid uneven force; after final tightening, they need to be marked to prevent missing tightening.
Welding construction:
Clean the rust and oil on the surface of the groove before welding, and the welding rod needs to be dried as required (such as the drying temperature of E43 type welding rod is 150-200℃) and stored in an insulation tube.
Important nodes (such as beam-column rigid connection) need to be welded symmetrically to avoid component deviation due to welding deformation; after welding, check the appearance of the weld (no cracks, pores), and key welds need to be tested by non-destructive testing (such as UT flaw detection).
Purlin installation: The connection between purlin and main structure should be firm, and the spacing deviation should be ≤5mm; check the deflection after installation (maximum deflection ≤L/200, L is the span of purlin) to avoid subsequent cracking of roof materials.
Enclosure sheet (color steel sheet) installation: The overlap length of the sheet should meet the design (generally ≥100mm for roof and ≥80mm for wall), and the overlap should be sealed with sealant; the fixing screws should be driven into the purlin (avoid hollowing), and the spacing should be uniform (generally 300-500mm) to prevent the sheet from loosening and leaking.
Easy To Operate

Vita est illis semper in fuga uxoresque mercenariae conductae ad tempus ex pacto atque, ut sit species matrimonii, dotis nomine futura coniunx hastam et tabernaculum offert marito, post statum diem si id elegerit discessura, et incredibile est quo ardore apud eos in venerem uterque solvitur sexus.
- Post hoc impie perpetratum quod
- Conlaticia victitabant, et civili iustoque imperio
Easy To Operate

Vita est illis semper in fuga uxoresque mercenariae conductae ad tempus ex pacto atque, ut sit species matrimonii, dotis nomine futura coniunx hastam et tabernaculum offert marito, post statum diem si id elegerit discessura, et incredibile est quo ardore apud eos in venerem uterque solvitur sexus.
- Post hoc impie perpetratum quod
- Conlaticia victitabant, et civili iustoque imperio

Safety, quality and painting of steel structures

Safety management

High-altitude work: installers need to wear safety belts (hang high and use low), and the work surface is equipped with edge protection (such as safety nets); before the components are installed and fixed, personnel are prohibited from staying below.
Lifting safety: When the crane is operating, people are prohibited from standing within the rotation radius of the boom; stop lifting when the wind force is ≥6 to prevent the components from shaking out of control.
Electricity safety: welding and cutting operations must use qualified distribution boxes, and wires must be prevented from being damaged; open-air welding is prohibited on rainy days.

Quality inspection

Process inspection: After each process is completed, it is necessary to check (such as the verticality of steel columns, the elevation of roof beams, and the tightening torque of bolts), and the next process can be carried out only after passing the inspection.
Common problem handling:
If the verticality of the component exceeds the standard after installation, it can be corrected by adjusting the temporary support or gasket (the number of gasket layers ≤3 layers).
If there are defects such as pores and slag inclusions in the weld, they need to be removed and re-welded, and it is forbidden to cover them with repair welding.

Anti-corrosion and coating

After installation, reapply the anti-corrosion coating (such as primer and topcoat) damaged during transportation and installation, and the coating thickness must meet the design (generally total thickness ≥ 120μm).
High-strength bolt connection parts and areas after welding spatter cleaning need to be repainted to prevent rust.

Cleaning and acceptance

Cleaning the site: remove temporary supports and scaffolding, and clean up debris on the surface of components (such as welding slag and dust).
Completion acceptance: Check the overall verticality, plane displacement, roof drainage slope, etc. of the structure against the design drawings and specifications to ensure that it meets the use requirements.

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Steel Structure Construction Warehouse Installation Completed

The core installation link of steel structure workshop

Easy To Operate