Technical Guide: Choosing the Right Slab Formwork System
A step-by-step engineering handbook to help project managers select, size, and layout shoring equipment.
System Selection Protocol
Selecting the wrong formwork system can cause severe delays, deflections, or site accidents. This guide outlines key parameters to evaluate, helping you match shoring equipment to your project requirements.
Four Quantitative Engineering Checks
Every concrete site manager should complete these four critical steps before selecting equipment:
- Check 1: Calculate Total Concrete Load Intensity (Depth of slab x concrete density + construction live load surcharge).
- Check 2: Assess Crane availability (If hook-time is limited, select lightweight handset aluminum systems).
- Check 3: Evaluate Story Height (Up to 4.5 meters use telescopic props; taller heights require engineered shoring towers).
- Check 4: Align Cycle Target (For high-speed 5-day climbs, configure early stripping drophead layouts).
Estimating Prop Capacity Margins
As props extend taller, their axial load capacity decreases. A telescopic prop rated for 30 kN at minimum extension may carry only 15 kN when fully extended. Always reference the manufacturer's load curve tables to ensure safety factors remain compliant.
Structural Inspection Guidelines
Before pouring, verify prop plumb, wedge lock stability, and mudsill thickness. These represent the active physical inspection areas regulated under OSHA Subpart Q.
View OSHA Compliance Basics →Model Your System Requirements
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