How to Install Overhead Crane Rail?

Installing overhead crane rails is a high-precision engineering task that directly impacts the safety, efficiency, and lifespan of both the elevated runway structure and the lifting equipment. Elevated tracks require incredibly strict tolerances to prevent crane skewing, excessive wheel wear, and dangerous structural vibrations.

As a globally recognized manufacturer in the railway and crane track industry, GNEE RAILWAY RAILWAY leverages cutting-edge manufacturing facilities and a massive production capacity to deliver premium crane rails engineered for flawless elevated installation. We do not merely roll steel; we provide comprehensive track solutions. Every rail produced by GNEE RAILWAY RAILWAY undergoes rigorous quality control to ensure exceptional straightness and dimensional accuracy.

GNEE RAILWAY RAILWAY can provide various types of crane rails:

Click here to obtain the detailed product catalog of GNEE RAILWAY RAILWAY.

1. Inspection and Preparation of the Runway Beam

Overhead crane rails are typically installed on elevated steel girders or reinforced concrete beams. Before hoisting any rail, the runway beam must be meticulously surveyed. Engineers must check the elevation, span, and horizontal straightness of the beams using laser leveling equipment. For steel girders, the top flange must be thoroughly cleaned of rust, grease, and debris to ensure a proper surface for welding rail clips. Any structural deviations in the beam will be transferred directly to the rail, causing severe operational issues later.

2. Laying the Continuous Rubber Pads

To minimize the intense vibrations and noise generated by heavy overhead cranes, a steel-reinforced elastomeric rubber pad is often laid continuously along the center of the runway beam. This pad sits directly beneath the rail base. It not only absorbs dynamic shock loads, thereby protecting the runway girder from fatigue, but also helps to compensate for minor, localized unevenness on the beam's surface.

3. Hoisting and Initial Rail Positioning

Lifting heavy crane rails (such as QU series or DIN 536 series) 10 to 30 meters into the air requires strict safety protocols and synchronized lifting equipment. Multiple lifting points or specialized spreader beams must be used to prevent the long steel rails from bending permanently under their own weight. Once elevated, the rails are carefully lowered onto the rubber pads and temporarily held in place.

4. Track Alignment and Gauge Adjustment

This is the most critical phase of the installation. The exact distance between the two parallel elevated rails-known as the track span or gauge-must perfectly match the crane's wheel span. Surveyors use theodolites and laser alignment tools to position the rails. The tolerance for gauge deviation is extremely tight, often restricted to just ±3mm to ±5mm. If the gauge is too wide or too narrow, the overhead crane will "crab" (run diagonally), causing severe friction that can grind down the wheel flanges and rail heads in a matter of weeks.

5. Connecting the Rail Joints

Overhead crane rails must be connected to form a continuous track. There are two primary methods:

• Aluminothermic Welding: For medium to heavy-duty cranes, the rail ends are welded together using the thermite welding process to create a Continuous Welded Rail (CWR). The weld is then ground perfectly smooth. This eliminates the joint gap, ensuring vibration-free travel and extending the life of the crane wheels.

• Bolted Fishplates (Joint Bars): For lighter-duty applications, specialized splice bars are bolted through pre-drilled holes at the rail ends.

6. Fastening the Rail Clips

Once perfectly aligned, the rails are permanently secured to the runway beam using heavy-duty, adjustable crane rail clips.

• On steel girders, the base of the clip is usually welded directly to the girder. The upper part of the clip, equipped with a vulcanized rubber nose, is bolted down onto the rail flange.

• On concrete beams, the clips are secured using pre-embedded anchor bolts or sole plates.

These fastening systems allow for slight lateral adjustments to fine-tune the gauge in the future while applying massive downward clamping force to secure the rail against intense lateral loads.

• Select the appropriate crane rail based on the crane's tonnage and span.

• Both rails must be installed horizontally. If one rail is consistently higher than the other, the overhead crane will tend to shift towards the lower side, increasing the lateral force on the rails and causing "rail gnawing" during crane travel, which may lead to crane accidents.

• The span error between the two rails should be controlled within 10mm. For shorter travel distances, it should be controlled within 3mm.

 

• Rails should be connected using fishplates and secured with bolts; direct welding is not permitted.

 

• The gap between rail joints should generally be 1–2mm. In colder regions, a temperature compensation gap of 4–6mm should be considered due to thermal expansion and contraction.

• Rails should be fixed to the crane beam using pressure plates and bolts; direct welding is not allowed.

• Safety awareness should be heightened during installation to ensure safe operations.

GNEE RAILWAY RAILWAY deeply understand that an overhead crane track is a cohesive mechanical system. From rolling high-precision rails to manufacturing the exact matching weldable clips, continuous elastomeric pads, and joint bars, GNEE RAILWAY RAILWAY deliver a 100% integrated, plug-and-play solution. We even offer customized secondary processing, such as precision exact-length cutting, angle beveling, and pre-drilling at our facility, to drastically reduce your elevated installation time and labor costs.

Send your special customization requirements to GNEE RAILWAY.