Crane Runway Installation Requirements: What to Prepare

Most crane problems that appear in the first year are runway problems, not crane problems. Before the crane arrives, the runway beams have to be level, parallel and stiff enough; the rails have to be straight and supported; and the civil works have to be finished far enough ahead that the crane can be erected without rework. This checklist covers what to prepare.

The short answer

A crane runs well when the two rails are level with each other, parallel over the full travel, straight, and supported by beams that deflect within the limits the crane supplier specifies. Everything else — anchor bolts, end stops, buffers, power supply and access — is preparation that has to be complete before the crane is unpacked.

Civil works to complete first

• Runway beams and brackets at the correct rail level, with the crane supplier's wheel load and wheel base already known.
• Column spacing confirmed against the crane span, measured clear between the rails rather than taken from the building drawing.
• Rail level tolerance between the two rails — the rails must be level with each other within the tolerance in the erection drawing, measured at the same longitudinal position.
• Rail straightness and gauge over the full travel, checked after the beams are finally bolted, not before.
• Anchor bolts, base plates and grouting complete and cured, with the bolt positions verified against the supplier's drawing.
• End stops and buffers installed at both ends of the travel, sized for the crane speed and mass.
• Maintenance access — platforms, walkways or a means of reaching the rail, the end carriage and the festoon system.
• Clearances — the space the crane and the load need at the extremes of travel and at the top of the lift path.

Deflection: the number people forget

The runway beam deflects under the crane, and the acceptable amount is expressed as a fraction of the span — limits such as L/600 to L/800 are common for crane runways, depending on the duty and the standard being applied. The value that matters is the one your crane supplier has designed to, because it is stated in the erection drawing and it affects both the rail alignment and the crane's behaviour.

Deflection that exceeds the agreed limit has two visible outcomes: the crane becomes difficult to push or drive along the runway, and the rail alignment changes under load, which accelerates wheel and rail wear. Where the crane supplier gives a deflection limit, treat it as a design input to the civil works, not as advice.

Rails and their support

• Rail type and section must match the wheel and the clip system specified for the crane.
• Embedded or bolted rail — the choice affects the tolerance you can hold and the repair method later.
• Rail joints aligned and supported so the wheel does not step at the joint. Staggered joints on the two sides are common practice, because both wheels crossing a joint at the same moment produces a visible shock.
• Clip spacing and torque verified after the crane has run for the first few shifts, because rails settle.
• Cleanliness — scale, weld spatter and debris on the rail surface damage wheels and are cheap to remove beforehand.

Power supply and control

• Power available at the crane isolation point, with the correct voltage, frequency and phase arrangement, and protected against overload and earth fault.
• Festoon or conductor bar selected and installed over the full travel, with the correct number of conductors for the control and safety circuits.
• Earthing and bonding complete, and the crane connected to the site earthing system.
• Isolator position accessible and clearly identified, and arranged so that maintenance can be carried out safely.
• Lighting and emergency stop arrangements agreed with the site safety rules.

On-site acceptance

1. Verify the runway dimensions and levels against the erection drawing and record the measurements.
2. Erect the crane, check the wheel contact and the clearances at both ends of the travel.
3. Carry out the no-load functional test: travel, cross travel, hoist, limits, brakes and emergency stop.
4. Carry out the load test in accordance with the applicable standard and the site rules, and record the results.
5. Check the runway again after the load test, since this is when alignment problems show up.
6. Run the crane on duty for the first shifts and re-torque the rail clips, the wheel and drive fixings.

Common mistakes

• Measuring the span from the building drawing instead of between the actual rails.
• Leveling the two rails independently instead of measuring the difference between them at the same position.
• Grouting column base plates before the crane supplier has confirmed the rail level.
• Installing the rail before the runway beams have taken any applied load, then finding the alignment moves.
• Leaving the power supply, earthing or isolator to be completed during commissioning — it delays the load test.
• No maintenance access to the festoon, the end carriage or the rail, which turns routine inspection into a shutdown.

What to prepare before the crane ships

Send the supplier the bay drawing with column spacing, rail level and the clear height, and confirm the runway deflection limit they are designing to. Before the crane arrives, have the runway built and surveyed, the rails installed and checked, the power and earthing complete, the end stops in place and the load test arrangements agreed. Those items are the difference between a crane that goes into service on the planned date and one that waits in its packing case.