This standard specifies the material requirements, dimensions, sectional properties, tolerances, and surface finish for both machined and cold-drawn steel guide rails used for lift cars and counterweights. It also provides a designation system for ordering and includes calculation principles for ensuring the rails can withstand operational and safety-gear-related forces.
Specifies the requirements for T-section metallic guide rails for lifts, including their dimensions and tolerances.
Quick Reference Values
Minimum tensile strength of steel370 N/mm² (for general use)
Higher grade tensile strength520 N/mm² (for higher stress applications)
Maximum straightness deviation (Machined)1.0 mm over a 5 m length
Maximum straightness deviation (Cold Drawn)0.5 mm over a 5 m length
Standard length of guide rail section5000 mm
Surface roughness (guiding surfaces)Ra ≤ 1.6 µm for machined, Ra ≤ 0.8 µm for cold drawn
Key Formulas
δ = (F_h * l³) / (70.6 * E * I) — Formula for horizontal deflection of guide rails under horizontal forces.
Practical Notes
The choice between machined (T-profile) and cold-drawn rails depends on the lift's speed, capacity, and required ride quality; cold-drawn rails offer tighter tolerances and better finish.
Correctly specifying the rail designation (e.g., 'T 89/B' or 'CD 01') as per Clause 6 is crucial to procure the correct profile and material grade.
Verification of surface roughness (Clause 5.4) on guiding surfaces is critical as it directly affects ride comfort, noise levels, and the lifespan of guide shoes.