Crane Runway in Industrial Halls: Design, Capacities & Standards
The crane runway is one of the most demanding components of an industrial hall. Here's what you need to know about capacities, spans, and standards.
A crane runway is not just "a rail on a beam" — it's one of the most demanding technical components in an industrial hall. An incorrectly designed crane runway can destroy a hall within 10 years through dynamic material fatigue.
Here's what every investor and designer must know.
Types and capacities
Structural calculation of crane runway — what's calculated?
A crane runway transfers dynamic loads — cranes accelerate, brake, and pick up loads. Eurocode 1-3 (EN 1991-3, EN 1993-6) defines 6 load categories for cranes:
| Load | Description | Factor |
|---|---|---|
| Vertical (Q_r) | Weight of crane + load | γ_f = 1.35-1.5 |
| Lateral horizontal (H_T) | Bridge braking | ψ = 0.6-1.0 |
| Longitudinal horizontal (H_L) | Wheel braking | 0.8 × wheel force |
| Dynamic multiplier (φ) | Impact of lifting loads | φ₁ to φ₅ |
| Fatigue | Cyclic loads (1M+ cycles) | Category S0-S9 |
Crane duty classes per workload intensity (FEM 1.001 / ISO 4301)
| Class | No. of cycles | Application | Fatigue class |
|---|---|---|---|
| A1-A3 | < 63,000 | Occasional use, maintenance cranes | S0-S2 |
| A4-A5 | 63,000-500,000 | Standard industry, 1-2 shifts | S3-S5 |
| A6-A7 | 500,000-2M | Intensive industry, shipbuilding | S6-S7 |
| A8 | > 2M | Steel mills, continuous operation | S8-S9 |
Sizing the crane runway beam
For a crane runway with a bridge crane rated 20 t, hall span 25 m, class A5:
Connection details — rail and beam
The rail is NOT welded directly to the beam — we use rail clips that allow small movements and absorb dynamic loads. Direct welding causes stress concentrations and weld cracks under fatigue.
| Fastening system | Advantage | Disadvantage | Recommendation |
|---|---|---|---|
| Bolted rail clips | Elastic, allows movement | More expensive | A4-A8 cranes |
| Direct welding | Cheap | Fatigue failure risk! | A1-A3 only |
| Elastic pad + bolts | Dampens vibrations | More complex detail | Noisy operations |