Step-by-Step Guide to Constructing Column Formwork
1. Preparation
- Material Selection: Choose steel formwork (3–6 mm thickness) for high-strength requirements or aluminum/wood for lighter applications1420
- Site Layout: Ensure a level base and mark column positions using string lines or laser levels
- Safety Check: Verify all equipment (cranes, clamps) meets ISO standards and wear PPE
2. Assembly of Steel Formwork
- Modular Panels: Connect pre-fabricated steel panels using U-clamps or bolts, ensuring edges are aligned to prevent concrete leakage1224
- Reinforcement: Add internal ribs or braces for stability, especially for tall columns (>5m)
- Adjustability: Use adjustable frames for non-standard column shapes (e.g., tapered or circular)
3. Installation & Fixing
- Erection: Hoist panels into place with cranes and secure them with tie rods or external supports
- Alignment: Check verticality with plumb bobs ( tolerance <2mm/m ) and adjust with wedges if needed
- Sealing: Apply bond-breaking oil or plastic sheets to prevent concrete adhesion
4. Concrete Pouring & Removal
- Pouring: Use tremie pipes for deep columns to avoid segregation; vibrate to eliminate air pockets
- Curing Time: Wait 24–48 hours before stripping (depending on temperature and mix design)
- Demolding: Loosen clamps systematically and remove panels from top to bottom to avoid damage
Safety & Common Issues
- Risks:
- Fall hazards during high-rise installation (use guardrails)
- Overloading from wet concrete (ensure supports rated ≥60 kN/m²)
- Maintenance:
- Clean and apply epoxy coatings after each use to prevent rust
- Inspect for deformations before reuse
