2025-03-20    154

Hoisting Process Flow

Positioning → Elevation Setting → Column Top Bolt Pre-embedding → Elevation Verification → Line Marking → Column Installation → Steel Beam Installation → Secondary Component Installation → Welding → Touch-up Painting → Completion

Steel Column Installation Process

I. Hoisting of Steel Columns

1. Foundation Recheck: Measure anchor bolt exposure length, deviation of bolt centerline from the baseline, bolt spacing, and foundation elevation. Address any non-conformities before hoisting.

2. Column Marking: Mark a 500mm reference line on visible column sections for fine adjustment of elevation during installation.

3. Hoisting Method:

• Secure the column with a single wire rope, positioning the sling point at 1/3 of the column length from the top.

• Lift the column using the rotation method and position it. Place padding at sling contact points.

II. Column Alignment

1. Vertical Alignment:

• Mark centerlines on visible column faces.

• Adjust verticality using a theodolite in two perpendicular directions.

2. Control Line Verification: Ensure column verticality by measuring the distance from the column inner edge to pre-marked building control lines.

3. Integrated Adjustment: Simultaneously address elevation, axis deviation, and verticality until all criteria are met.

   
   

Steel Beam Installation Process

1. Beam Delivery:

• Transport beams near columns using mobile cranes.

• Transfer beams to the floor level via derrick cranes. Heavy main beams may be hoisted jointly with mobile cranes.

2. Installation Sequence:

• Begin from Zone 3, installing main beams first, followed by secondary beams and purlins.

• Secure beams with installation bolts or temporary welding before releasing hooks.

3. Rigging Details:

• For long beams (e.g., 20m), use a steel spreader beam and triangular lifting lugs to widen wire rope spacing and optimize sling angles (refer to rigging diagram).