EN 12812 Concrete Shoring & Falsework Engineering Guide: Fresh Concrete Loads, Leg Grids & Buckling Length
Falsework collapses during concrete pours stem almost universally from under-braced prop lengths, over-extended screw jacks, or underestimated wet-concrete dynamic loads. Here is how structural engineers pre-size EN 12812 Ringlock shoring grids across 15 cm to 60 cm slabs.
| Concrete Thickness | Wet Concrete + Formwork Dead | Pouring Live Load | Total Unfactored Load | Typical Ringlock Grid | Horizontal Bracing Lift |
|---|---|---|---|---|---|
| 15 – 20 cm Standard Slab | 3.75 – 5.00 + 0.50 kN/m² | 1.50 kN/m² | ~5.75 – 7.00 kN/m² | 150 × 200 cm or 200 × 200 cm | 150 – 200 cm vertical ledger lifts |
| 25 – 30 cm Industrial Slab | 6.25 – 7.50 + 0.60 kN/m² | 1.50 kN/m² | ~8.35 – 9.60 kN/m² | 140 × 150 cm or 150 × 150 cm | 150 cm lifts braced in 4 directions |
| 35 – 45 cm Drop / Transfer Slab | 8.75 – 11.25 + 0.70 kN/m² | 1.75 kN/m² | ~11.20 – 13.70 kN/m² | 105 × 140 cm or 140 × 140 cm | 100 – 150 cm vertical ledger lifts |
| 50 – 60 cm Viaduct / Cap Slab | 12.50 – 15.00 + 0.80 kN/m² | 2.25 kN/m² | ~15.55 – 18.05 kN/m² | 105 × 105 cm or 75 × 105 cm | 100 cm lifts (every 2nd rosette) |
| Deep Transfer Girder (80cm+) | 20.00+ kN/m² concentrated | 2.50 kN/m² | ~23.00+ kN/m² | 75 × 75 cm Dense / Paired Standards | 50 – 100 cm lifts + Stamped Calc |
1. Accounting for 25 kN/m³ Reinforced Wet Concrete & Concrete Pump Surge Loads
Under EN 12812, heavily reinforced fresh concrete is modeled at 25.0 kN/m³ (~2,550 kg/m³) plus formwork self-weight (0.5–0.8 kN/m²), minimum 1.50 kN/m² crew/vibrator live load, concrete cone heaping from boom pumps, and horizontal wind/imperfection forces multiplied by partial safety factors ($\gamma_G = 1.35$, $\gamma_Q = 1.50$).
2. Controlling Slenderness: Bracing Lift Intervals & Screw Jack Extension Limits
Axial leg capacity rises substantially when horizontal ledgers and 4-way wedge diagonals tighten from 2.0 m vertical lifts to 1.5 m or 1.0 m lifts. Crucially, never over-extend bottom or top screw jacks and U-heads—make up elevation height using 50 cm or 100 cm Ringlock starter standards instead.
3. Concentric H20 Beam Seating in U-Heads & Custom Shoring Calculations
Primary H20 timber or steel bearers must sit concentrically inside four-way U-heads to prevent eccentric bending moments. Explore our Heavy-Duty Ringlock Shoring Systems and request a paid DWG shoring calculation for your slab geometry.
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Frequently Asked Engineering & Export Questions
Does the pre-sizing table replace a site-specific structural calculation?
Can standard 75 cm H-Type facade frames be used for heavy concrete slab shoring?
How much does 1 m³ of reinforced fresh concrete weigh?
Are diagonal braces required on both X and Y axes of shoring towers?
How must shoring base jacks be supported on grade?
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