Double Girder Overhead Crane for Bridge Steel Structure Fabrication

The D32t-58m double girder overhead crane plays a central role at China Railway Baoji Bridge (Yangzhou) Co., Ltd., a leading enterprise in the bridge equipment manufacturing sector that undertakes numerous national bridge projects. In the fabrication and assembly of large steel bridge structures, highly efficient and precise heavy-duty lifting equipment is essential. With its long span and high load capacity, this crane has become a key piece of equipment in the company's core production processes.

China Railway Baoji Bridge Group Co., Ltd. Overview

China Railway Baoji Bridge Group Co., Ltd. (CRBBG), headquartered in Baoji, Shaanxi, is a leading Chinese manufacturer specializing in steel bridges, heavy steel structures, railway turnouts, urban rail transit equipment, and large-scale lifting machinery. Formerly a key subsidiary of China Railway Group, CRBBG was restructured in 2017 into the listed China Railway Hi-Tech Industry Co., Ltd. It remains a critical supplier for China’s railway construction and major infrastructure projects.

Double Girder Overhead Crane Equipment Specifications

• Model: D32t-58m Double Girder Overhead Crane
• Rated Load Capacity: 32 tons
• Span: 58 meters
• Lifting Height: Suitable for multi-level workshop operations
• Operating Speed: Optimized for main girder travel, trolley travel, and hoisting speed, balancing efficiency and safety
• Structural Features:
  • Double girder design with high-strength welded box beams, ensuring rigidity and stability under long spans
  • Trolley rails integrated with the main girder to reduce stress concentration
  • Anti-sway device enhances heavy load positioning accuracy

Double Girder Overhead Crane Application Scenarios and Results

Bridge Steel Structure Fabrication

• Task: Lifting large steel box girders and truss segments (20–30 tons each)
• Outcome: Precision positioning and smooth hoisting kept assembly errors within ±2mm, significantly improving component alignment efficiency

Equipment Maintenance and Servicing

• Task: Handling heavy electromechanical equipment (e.g., motors, reducers)
• Outcome: The crane's span covers the entire maintenance workshop, reducing equipment transfer time and labor costs

Workshop Material Handling

• Task: Transferring raw materials and semi-finished products between multiple workshop bays
• Outcome: 58-meter span enables unobstructed material flow, boosting overall workshop logistics efficiency

Double Girder Overhead Crane Technological Innovations

• Intelligent Control System: Equipped with PLC automation for lifting, traveling, and positioning; supports remote monitoring and fault diagnostics
• Safety Redundancy:
  • Dual braking system (main + auxiliary)
  • Overload protection, limit switches, wind speed monitoring
  • Emergency power system ensures safe lowering during power outages
• Maintenance Convenience:
  • Main girders include inspection pathways for routine checks
  • Key components (wire ropes, pulley blocks) adopt modular design for rapid replacement

Customer Feedback

A representative from China Railway Baoji Bridge (Yangzhou) Co., Ltd. stated:
“Since the D32t-58m double girder overhead crane was put into service, the fabrication cycle for bridge components has shortened by 30%. Equipment failure rates remain below 0.5%, and its long span and high-precision positioning provide reliable support for the assembly of complex steel bridge structures.”

Industry Significance

This case demonstrates the technical breakthroughs of double girder overhead crane under long-span, high-precision, and heavy-duty conditions. It provides effective solutions for bridge fabrication, port logistics, and heavy machinery sectors, driving the crane industry toward greater intelligence and larger-scale applications.

Cindy

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