T/CPARK 1-2018 Bridge Crane Technical Specifications
T/CPARK 1-2018 "General Technical Specifications for Bridge Cranes" is a group standard developed for bridge cranes manufactured in the Changyuan crane industry cluster. It defines the general technical requirements, test methods, inspection rules, and marking, packaging, transport, and storage requirements for bridge cranes. The standard was issued by the Crane Industry Alliance of Changyuan City, known as the "Hometown of Cranes in China."
Key Technical Parameters and Tolerances
The standard specifies the primary technical parameters for bridge cranes: rated lifting capacity from 1 to 320 t, spans from 7.5 to 31.5 m, and work duty classifications from A3 to A7. Under no-load conditions, the camber of the main girder must be maintained between S/1000 and S/500 (where S is the span). For example, a crane with a 22.5 m span must have a camber of 22.5 to 45 mm. Under rated load, the mid-span deflection of the main girder must not exceed S/700 for duty class A5 or S/800 for duty class A6.
The span deviation of the crane bridge must not exceed ±5 mm (measured with a steel tape under a 100 N tension), and the trolley gauge deviation must stay within ±3 mm. The crane runway rail span deviation is also limited to ±5 mm. End carriages are connected to the main girder using high-strength bolts, with bolt pretightening torque applied per the design values. The electrical system must comply with GB/T 25122, with control voltage not exceeding 48 V and grounding resistance no greater than 4 Ω.
The camber design of the main girder is critical to the crane's long-term performance. During manufacturing, a preset camber of S/1000 to S/500 is built into the main girder to compensate for deflection that develops over years of service. The standard requires that under rated load, the mid-span deflection must not exceed S/700 for duty class A5 or S/800 for duty class A6. If the camber is completely lost or the girder begins to sag, the main girder must be repaired or the crane must be derated for continued service.
Span deviation measurements must be taken in conditions free from solar radiation effects. When using a steel tape, a 100 N tension must be applied and temperature corrections factored in. For every 1°C difference between ambient temperature and the standard reference temperature (20°C), the steel tape length changes by approximately 0.011 mm/m. For cranes with large spans (greater than 20 m), a total station or laser distance sensor is recommended for span measurement to achieve higher accuracy.
Safety Devices and Inspection Requirements
Mandatory safety devices include a load limiter (cutting power to hoisting at ≥110% of rated capacity), a lifting height limit switch, travel limit switches with buffers, and an emergency stop switch. Cranes with a rated capacity of 3 t or more are subject to regulatory inspection as special equipment. The standard also requires anti-collision devices, a load indicator, and a fault alarm system.
Routine factory tests include a no-load test (at least 5 full operating cycles), a rated load test (3 hoisting and lowering cycles), a 1.25× static load test (holding for 10 minutes while checking main girder camber), and a dynamic load test at 1.1× rated load for 3 cycles. In-service cranes must undergo a comprehensive safety inspection every six months.
Full Range
Standard Spans
No-Load Condition
≤S/800(A6)
Per Operating Conditions
Main Structural Components
| Parameter | A5Class | A6Class |
|---|---|---|
| Lifting Capacity Range | 5~50t | 10~100t |
| Deflection Control | ≤S/700 | ≤S/800 |
| Duty Cycle | 2×10⁴~6×10⁴ | 6×10⁴~2×10⁵ |
| Typicaloperating conditions | Machinery Machining | Logistics & Warehousing |
Safety devices on overhead cranes are fundamental to safe operation. The load limiter must accurately detect the lifting capacity and automatically shut down the hoisting motion when the load reaches 110% of the rated capacity, while simultaneously triggering an audible and visual alarm. Calibration checks on the load limiter should be performed monthly to confirm its accuracy remains within ±5%. The hoisting limit switch and travel limit switch should be inspected weekly to verify their operational reliability.
Service Life and Maintenance
Standards specify a design service life of 30 years for overhead cranes. Main structural components must remain free of fatigue cracks throughout their service life. The wheel tread hardness should be HB300–380, with a hardened layer depth of at least 15 mm. The gearbox requires an oil change after the first 100 hours of operation, followed by routine oil changes every 1,000 hours. Wire ropes should be inspected every 500 hours for wire breaks and proper lubrication.
| inspection items | technical requirements | Cycle | Method |
|---|---|---|---|
| Camber | S/1000~S/500 | Semi-annual | Level Instrument |
| Span | ±5mm | Installation | Steel Rule |
| Track Gauge / Rail Gauge | ±3mm | Installation | Measuring Tool |
| Load | 1.25Times×10min | Annual | Visual+Measuring Tool |
Kelude Heavy Industry manufactures bridge cranes in accordance with the T/CPARK standard.
Frequently Asked Questions
Q: What are the camber requirements for the main girder of a bridge crane?
A: Under no-load conditions, the camber should be between S/1000 and S/500. For example, for a span of 22.5 m, the camber should be 22.5 to 45 mm. The camber compensates for deflection that occurs over long-term use. Regular inspections are required; if the camber disappears or deflection appears, repair or scrapping is necessary.
Q: What are the span deviation tolerances for bridge cranes?
A: The deviation between the main girder span and the centerline distance of the crane runway rails must not exceed ±5 mm. The trolley gauge deviation must not exceed ±3 mm. The span deviation of the crane runway rails must not exceed ±5 mm. Span deviation is measured using a steel tape with a pulling force of 100 N, with temperature correction applied.
Q: What safety devices are required on a bridge crane?
A: Mandatory safety devices include a load limiter (cutting off hoisting at ≥110% of rated capacity), a hoisting height limit switch, travel limit switches with buffers, and an emergency stop switch. Cranes with a rated capacity of ≥3 t are subject to special equipment inspection.
Q: What are the design life and maintenance intervals for bridge cranes?
A: The design life is typically 30 years. The gearbox oil should be changed after the first 100 hours of operation, and then every 1,000 hours thereafter. Wire ropes should be inspected every 500 hours. The tread hardness of the crane wheels should be HB300–380. A comprehensive safety inspection is required annually.
