Steel Structure Installation

Steel structure installation refers to the process of connecting and fixing prefabricated steel components at the construction site according to design requirements to eventually form a steel structure with a specific shape and function. It includes a series of links such as component acceptance, lifting and hoisting, temporary fixation, measurement and calibration, welding and anti-corrosion.

Precautions for steel structures

Anti-corrosion treatment

Steel is prone to rust (especially in humid and coastal areas), and needs to be protected by coating (primer + topcoat, such as epoxy zinc-rich primer for corrosion protection), galvanizing (zinc layer isolates air), etc. The general coating life is 15-20 years, and regular maintenance (painting) is required in the later stage.

Fire protection treatment

Steel strength drops sharply above 600℃ (loses bearing capacity), and fire protection is required: apply fire-retardant coating (such as thick coating, the fire resistance limit can reach 3 hours), wrap fireproof board, etc. (designed according to the fire resistance level of the building, such as the first level of the factory building fire resistance level ≥3 hours).

Node design and construction

Nodes (such as beam-column connections) are weak points of steel structures. If the bolts are not tightened enough or the welding quality is poor (such as incomplete penetration), it is easy to cause node damage. Construction needs to be strictly controlled: the final tightening torque of high-strength bolts meets the standard (such as M20 bolt torque is about 400-500N・m), and welding requires flaw detection (such as UT flaw detection to ensure no cracks).

Temperature deformation control

Steel expands and contracts significantly when heated and contracts when cooled (a temperature change of 100°C causes a 10-meter steel member to expand and contract by about 1.2mm). It is necessary to design expansion joints and sliding supports (e.g., an expansion joint is set every 30-50 meters for a long factory building) to avoid structural deformation caused by temperature stress.

Steel Structure Installation

Precautions for steel structures

Anti-corrosion treatment

Fire protection treatment

Node design and construction

Temperature deformation control

Project Photo Display

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