Double Girder Bridge Cranes: Top Running vs. Underhung

1. Introduction to Double Girder Bridge Cranes

Double girder bridge cranes represent the pinnacle of industrial lifting technology, offering superior strength, durability, and performance compared to single girder alternatives. As a leading manufacturer, Dongqi Crane provides both top running double girder bridge cranes and underhung double girder bridge cranes to meet diverse material handling needs across industries.

Key Advantages of Double Girder Design

• Higher load capacities (5-500+ tons)
• Increased hook height for better vertical clearance
• Enhanced stability with dual load-bearing beams
• Longer service life in heavy-duty applications
• Greater customization options for specialized needs

2. Top Running Double Girder Bridge Cranes

2.1 Design & Construction Features

Dongqi’s top running double girder bridge cranes feature:

• Robust box girder construction with FEM-standard steel
• Heavy-duty end trucks with forged steel wheels
• Precision-aligned runway systems
• Modular design for easy installation and maintenance

2.2 Technical Specifications

Parameter	Specification Range
Capacity	5-500+ tons
Span	10-40 meters
Lifting Height	6-30 meters
Work Class	FEM 1Am-4m
Operating Speed	5-30 m/min (adjustable)
Control Options	Pendant/Radio/Cabin

2.3 Pricing Structure

• Standard models: $25,000-$150,000
• Custom configurations: +20-50% premium
• Factors affecting price:
• Capacity requirements
• Span length
• Hoist type (wire rope vs. chain)
• Automation level
• Special environmental protections

2.4 Ideal Applications

• Steel mills and foundries
• Heavy manufacturing
• Power generation plants
• Large-scale assembly operations
• Shipbuilding yards

3. Underhung Double Girder Bridge Cranes

3.1 Unique Design Characteristics

Dongqi’s underhung double girder bridge cranes offer:

• Space-saving configuration utilizing building structure
• Lower headroom requirements
• Lighter weight construction
• Flexible installation options

3.2 Technical Specifications

Parameter	Specification Range
Capacity	1-20 tons
Span	5-30 meters
Lifting Height	3-15 meters
Work Class	FEM 1Am-3m
Operating Speed	2-20 m/min
Control Options	Pendant/Radio

3.3 Pricing Structure

• Standard models: $15,000-$60,000
• Custom solutions: +15-40% premium
• Cost advantages:
• Lower structural requirements
• Reduced installation costs
• Minimal foundation work needed

3.4 Ideal Applications

• Automotive manufacturing
• Warehousing and distribution
• Food processing facilities
• Light to medium industrial plants
• Facilities with height restrictions

4. Key Differences Between Top Running and Underhung Models

4.1 Structural Comparison

Feature	Top Running	Underhung
Support System	Runs on elevated rails	Suspended from ceiling
Headroom Requirement	Higher	Lower
Maximum Capacity	500+ tons	20 tons
Span Limitations	Up to 40m	Up to 30m
Installation Complexity	Higher	Lower

4.2 Performance Comparison

Aspect	Top Running	Underhung
Hook Height	Greater	Limited
Lateral Stability	Superior	Good
Maintenance Access	Requires platforms	Easier access
System Stiffness	Very high	Moderate
Duty Cycle Capability	Continuous	Moderate

4.3 Cost Comparison

Cost Factor	Top Running	Underhung
Initial Investment	Higher	Lower
Installation Costs	Significant	Moderate
Structural Support	Requires heavy runway	Uses building steel
Maintenance Costs	Comparable	Comparable
Total Cost of Ownership	Higher	Lower

5. Customization Options from Dongqi Crane

5.1 Standard Customizations

• Capacity upgrades within design limits
• Span adjustments to fit facility
• Special coatings (epoxy, galvanized, stainless)
• Control systems (pendant, radio, automated)

5.2 Advanced Custom Solutions

• Explosion-proof configurations
• High-temperature adaptations
• Cleanroom-compatible designs
• Multi-hoist systems
• Automation integration

5.3 Special Features

• Anti-sway technology
• Load monitoring systems
• Collision avoidance
• Remote diagnostics
• Energy recovery systems

6. Selection Guide for Industrial Buyers

6.1 When to Choose Top Running

• Heavy load requirements (>20 tons)
• High duty cycle operations
• Need for maximum hook height
• Outdoor or harsh environments
• Long-span applications

6.2 When to Choose Underhung

• Limited headroom facilities
• Light to medium duty cycles
• Existing structural support available
• Budget constraints
• Quick installation needs

6.3 Decision Factors

1. Load requirements (current and future)
2. Facility constraints (height, floor space)
3. Operational intensity (hours/day, lifts/hour)
4. Environmental conditions
5. Budget considerations

7. Dongqi Crane’s Manufacturing Excellence

7.1 Quality Assurance

• ISO 9001 certified production
• FEM 1.001 design standards
• 125% load testing protocol
• Third-party inspection available

7.2 Engineering Capabilities

• In-house R&D department
• Advanced CAD/CAM systems
• Finite element analysis
• Prototyping facilities

7.3 Global Project Experience

• 5000+ cranes installed worldwide
• Successful projects in 30+ countries
• Industry-specific expertise

8. Maintenance & Service Support

8.1 Preventive Maintenance

• Scheduled inspection programs
• Lubrication services
• Alignment checks
• Electrical system testing

8.2 Repair Services

• Emergency breakdown support
• Component refurbishment
• System upgrades
• Retrofit solutions

8.3 Spare Parts Availability

• Global inventory network
• OEM quality components
• Fast shipping options
• Competitive pricing

9. Why Choose Dongqi Crane?

9.1 Competitive Advantages

• 30% cost advantage over European brands
• 50% faster delivery than industry average
• 100% design flexibility for special requirements
• 24/7 technical support worldwide

9.2 Customer Success Stories

• Steel Mill Project: 200-ton top running crane
• Automotive Plant: Underhung system installation
• Warehouse Solution: Custom underhung design
• Power Station: Heavy-duty top running crane

10. Getting Started with Your Project

10.1 Consultation Process

1. Initial needs assessment
2. Technical specification development
3. Proposal and quotation
4. Engineering review
5. Manufacturing and delivery
6. Installation and commissioning

10.2 Request a Quote

Provide your basic requirements to receive:

• Preliminary specifications
• Budgetary pricing
• Delivery timeline
• Configuration options

Contact Our Engineering Team Today:
📞 +86 18638815424
📧 sales010@cranesdq.com
🌐 https://www.craneyt.com/double-girder-bridge-cranes-top-running-vs-underhung.html

Keywords: Double Girder Bridge Crane, Top Running Double Girder Bridge Crane, Underhung Double Girder Bridge Crane, Industrial Overhead Cranes, Heavy Duty Lifting Solutions