2025-03-19    242

Lifting Process Flow

Positioning → Elevation Setting → Pre-embedding of Column Top Bolts → Rechecking Elevation → Marking Lines → Column Installation → Steel Beam Installation → Secondary Component Installation → Welding → Touch-up Painting → Completion

Steel Column Installation Process

1. Lifting of Steel Columns

1. Foundation Inspection:

• Recheck the foundation, including exposed anchor bolt lengths, deviations of anchor bolt centerlines from reference lines, anchor spacing, and foundation elevation. Address any non-conformities before lifting.

2. Column Preparation:

• Mark a 500mm reference line on the visible cross-section of the column for fine adjustment of elevation during installation.

• Use a single steel wire rope to secure the column, with lifting points positioned at 1/3 of the column length from each end.

• Lift the column using the rotation method and position it for installation. Cushioning pads must be placed at binding points.

2. Column Alignment and Adjustment

1. Verticality Adjustment:

• Pre-mark centerlines on visible column faces. Adjust verticality using theodolites in two perpendicular directions.

2. Control Line Verification:

• Measure the distance between the column’s inner side and pre-marked building control lines to ensure verticality.

3. Integrated Adjustment:

• Coordinate adjustments for elevation, axis alignment, and verticality until all standards are met.

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Steel Beam Installation Process

1. Beam Delivery and Placement:

• Transport steel beams near columns using trucks. Lift beams to the floor level with a mobile crane, then install them using a derrick crane.

• For heavy main beams, use a combined lifting approach (mobile crane + derrick crane).

• Install secondary beams with a custom-built tire-mounted crane (5-ton capacity).

2. Installation Sequence:

• Start from Zone 3, following the order: Main Beams → Secondary Beams → Purlins.

• Install beams one by one using the derrick crane. Secure bolts or tack welding at both ends before releasing the hook. Proceed to the next beam.

• Conduct welding after passing inspections.

3. Lifting Points and Safety:

• For long beams (e.g., 20m beams), use a steel spreader beam and triangular lifting lugs to widen wire rope spacing, ensuring optimal lifting angles.

• Refer to the steel beam lifting diagram for binding details.

Key Notes

• Precision: Ensure all bolts and welds meet design specifications.

• Safety: Use certified lifting equipment and follow load capacity guidelines.

• Quality Control: Verify verticality, elevation, and alignment at each stage.

This plan ensures efficient and safe installation of steel structures while maintaining structural integrity.