ISO 24621:2022 Crane Foundation & Runway Beam Design Guide
ISO 24621:2022, "Cranes — Design of Foundations and Runway Beams," sets out the design requirements for crane foundations and runway beams. It covers two runway beam configurations (reinforced concrete beams for spans up to 30 m and steel beams for any span), deflection limits (≤ L/600 under rated load), embedded part accuracy (positioning ±2 mm, elevation ±5 mm, hot-dip galvanized), concrete grades (C30–C40, with Q345B steel beams requiring anti-corrosion coating ≥280 μm), foundation types (strip or isolated footings, width ≥800 mm, depth ≥600 mm), settlement control (annual settlement ≤5 mm, differential settlement ≤ span/1000), expansion joints (≤30 m), and grounding resistance (≤4 Ω).
Technical Requirements for Crane Foundations
Runway beams come in two forms: reinforced concrete beams (applicable to small- and medium-tonnage cranes with spans up to 30 m) and steel beams (for large spans and heavy loads). The loads acting on a runway beam include the crane's maximum wheel load multiplied by an impact allowance of 1.1 to 1.3, plus the dead weight of the beam itself. Deflection under rated load must not exceed L/600. Embedded parts require positioning accuracy of ±2 mm and elevation accuracy of ±5 mm, with hot-dip galvanizing applied. Concrete grades range from C30 to C40, reinforcement uses HRB400, and steel beams are fabricated from Q345B. Crane rails are selected from QU70 to QU120 based on the maximum wheel load.
Inspection and Applicable Standards
Foundation types include strip footings (the most common choice) and isolated footings (for large-tonnage cranes). Footing width is determined by the bearing capacity of the foundation and must be at least 800 mm, with a minimum embedment depth of 600 mm (below the frost line). Reinforcement is designed for flexural loading, using C30 concrete. Annual settlement must be limited to ≤5 mm, and differential settlement must not exceed span/1000. Expansion joints are spaced at intervals of ≤30 m. The drainage slope on top of the foundation must be at least 1%. Grounding resistance must be ≤4 Ω. Kelude Heavy Industry provides design consultation and construction guidance for crane foundations and runway beams.
| Item | Requirement |
|---|---|
| Beam Type | Reinforced Concrete/Steel Beam |
| Deflection | ≤L/600 |
| Embedded Part | ±2mm |
| Concrete | C30~C40 |
| Settlement | ≤5mm/Year |
| Grounding | ≤4Ω |
| Inspection | Period |
|---|---|
| factory | unit by unit |
| Annual Inspection | Annual |
The design of the crane foundation and runway beam must account for crane loads, geological conditions, and rail installation accuracy requirements. Runway beams are available in two configurations: reinforced concrete and steel. Reinforced concrete beams are applicable to medium- and small-tonnage applications with spans ≤30 m, offering lower cost and excellent rigidity. Steel beams suit large-span, large-tonnage applications, providing reduced dead weight and faster installation. Runway beam deflection is limited to ≤L/600 under rated load, ensuring that rail deformation remains within allowable limits during crane operation and maintaining proper contact between the crane wheel and rail. Positioning accuracy of embedded parts is a critical control point, with positioning deviation ≤±2 mm and elevation deviation ≤±5 mm; hot-dip galvanizing provides corrosion resistance. Concrete grade ranges from C30 to C40, while steel beams use Q345B (≈S355J2) with an anti-corrosion coating of ≥280 μm. Foundations are either strip or isolated footings, with a minimum width of 800 mm and a minimum embedment depth of 600 mm. Annual foundation settlement is limited to ≤5 mm, and differential settlement must not exceed 1/1000 of the span. Kelude Heavy Industry offers design consultation and construction guidance for foundations and runway beams.
FAQ: Crane Foundation & Runway Beam Design
Q: What does ISO 24621:2022 specify for runway beam type and deflection?
A: Runway beams come in two types: reinforced concrete (applicable to spans ≤30 m for medium- and small-tonnage applications, offering low cost and good rigidity) and steel (for large spans and large tonnage, providing light dead weight and quick installation). Under rated load, runway beam deflection must not exceed L/600, ensuring that rail deformation stays within allowable limits during crane operation and maintaining proper wheel-to-rail contact and operating stability.
Q: What are the accuracy and corrosion protection requirements for embedded parts?
A: Embedded parts must have a positioning deviation of ≤±2 mm and an elevation deviation of ≤±5 mm, with hot-dip galvanizing applied for corrosion protection. Embedded parts form the basis for rail installation accuracy—their positioning accuracy directly affects rail straightness and rail elevation. Embedded part layout must comply with the rail drawings, with a spacing deviation of ≤5 mm. Concrete grade is C30–C40, steel beams use Q345B (≈S355J2), and the anti-corrosion coating must be ≥280 μm.
Q: What are the requirements for foundation settlement and grounding?
A: Annual settlement must be ≤5 mm, and differential settlement must not exceed 1/1000 of the span. Excessive foundation settlement causes changes in rail elevation, affecting crane operating stability and, in severe cases, leading to rail gnawing (wheel flange rubbing). Grounding resistance must be ≤4 Ω, and the foundation top surface must have a drainage slope of ≥1% to prevent water accumulation. The foundation design service life is ≥20 years. Crane rails QU70–QU120 are selected based on maximum wheel load.
Q: What foundation design services does Kelude Heavy Industry offer?
A: Kelude Heavy Industry provides foundation and runway beam design consultation and construction guidance in accordance with ISO 24621:2022, covering foundation type selection, runway beam deflection calculation, embedded part layout drawings, earthing system design, and settlement monitoring plans.
