700 Ton Bridge Girder Launching Gantry

A 700 ton Bridge Girder Launching Gantry is a heavy-duty lifting and launching system used in the construction of large bridges, particularly for placing precast concrete or steel girders. These gantries are essential for erecting bridge segments in challenging environments, such as over rivers, highways, or uneven terrain.

 

 

Key Features of a 700 Ton Bridge Girder Launching Gantry:
High Load Capacity – Designed to handle girders weighing up to 700 tons, making it suitable for large-span bridges.

Modular & Adjustable Design – Can be customized for different bridge widths and girder configurations.

Self-Launching Capability – Moves forward autonomously using hydraulic or mechanical systems without requiring additional cranes.

Precision Placement – Equipped with hydraulic jacks, winches, and alignment systems for accurate girder positioning.

Stability & Safety – Features outriggers, counterweights, and locking mechanisms to ensure safe operations.

Automated Control System – Often includes PLC-based controls for smooth and synchronized movements.

 

 

 

 

 

 

 

A 700 ton Bridge Girder Launching Gantry is a heavy-duty machine used in bridge construction to lift, transport, and precisely position large precast concrete or steel girders. Here are its key components:

1. Main Gantry Structure
Gantry Beams/Girders – The primary load-bearing framework that spans the bridge construction area.

Support Legs/Towers – Provide stability and distribute the load to the ground or temporary supports.

Cross Beams – Connect the gantry legs for structural integrity.

2. Hoisting System
Lifting Winches – Electric or hydraulic winches with high-capacity cables.

Wire Ropes & Pulleys – For lifting and lowering the girder.

Spreader Beams – Ensure even load distribution during lifting.

3. Launching Mechanism
Hydraulic Jacks/Pushers – Move the gantry forward along the bridge span.

Tracks/Wheels – Rail-based or rubber-tired system for mobility.

Skidding System – Allows longitudinal movement during launching.

4. Hydraulic & Electrical Systems
Hydraulic Power Unit (HPU) – Powers jacks, winches, and adjustments.

Control Cabin – Operator station with joysticks and monitoring systems.

Sensors & Safety Devices – Load limiters, tilt sensors, and emergency brakes.

5. Temporary Supports & Foundations
Falsework/Piers – Temporary supports to hold girders during placement.

Anchoring System – Secures the gantry during operation.

6. Auxiliary Components
Outriggers/Stabilizers – Prevent tipping during lifting.

Counterweights – Balance the gantry when handling heavy loads.

Alignment Guides – Ensure precise girder positioning.

7. Safety & Monitoring Systems
Load Cells – Monitor lifting weight in real time.

PLC Control System – Automated operation and safety interlocks.

Wind Resistance Devices – Brakes and bracing for stability in high winds.

This gantry system is essential for constructing large-span bridges, viaducts, and elevated highways, ensuring efficient and safe girder installation.

 

 

 

 

A 700 ton bridge girder launching gantry is a heavy-duty construction machine used for lifting and placing large precast girders during bridge construction. Here are its key advantages:

1. High Load Capacity (700 Tons)

Can handle heavy and long-span girders (up to 700 tons), reducing the need for multiple cranes or supports.

Suitable for large-scale bridges, such as highway viaducts, railway bridges, and sea-crossing bridges.

2. Precision and Control

Offers accurate girder positioning with hydraulic or computerized control systems.

Minimizes human error, ensuring proper alignment and stability during installation.

3. Improved Safety

Reduces risks associated with manual lifting or unstable temporary supports.

Equipped with anti-sway, overload protection, and emergency braking systems.

4. High Efficiency & Speed

Speeds up bridge construction by quickly transporting and placing girders.

Reduces dependency on multiple cranes or manual labor, cutting project timelines.

5. Versatility

Adaptable to different girder types (T-beams, box girders, U-beams).

Can work in challenging terrains (mountains, rivers, urban areas) where traditional cranes struggle.

6. Cost-Effective

Lowers labor and equipment costs by reducing the need for auxiliary cranes.

Minimizes downtime and accelerates project completion, saving overall expenses.

7. Reduced Environmental Impact

Requires fewer support structures, minimizing ground disturbance.

More energy-efficient compared to using multiple smaller cranes.

8. Automation & Remote Control

Some models feature automated movement and remote operation, improving precision and worker safety.

9. Stability in Challenging Conditions

Can operate in high winds or uneven terrain due to its robust structural design and stabilizing mechanisms.

10. Long-Term Usability

Reusable across multiple bridge projects, offering a good return on investment.

Applications:

Highway & Railway Bridges

Urban Overpasses

River & Valley Crossings

Coastal & Offshore Bridges

Conclusion:

A 700 ton launching gantry enhances safety, speed, and precision in bridge construction while being cost-effective and versatile for large-scale projects. It is particularly beneficial for mega-infrastructure projects requiring heavy girder installations.

 

 

The 650t Bridge Girder Launcher is a heavy-duty machine used in the construction of large bridges, particularly for placing precast concrete or steel girders. It is designed to handle girders weighing up to 650 metric tons, making it suitable for long-span bridges, viaducts, and elevated highway projects.

Key Applications of a 650t Bridge Girder Launcher:
High-Speed Rail & Railway Bridges

Used to install heavy precast girders for high-speed rail tracks and conventional railway bridges.

Ensures precise alignment and placement for smooth rail operations.

Highway & Expressway Viaducts

Deploys large-span girders for elevated roadways and flyovers.

Reduces construction time compared to traditional methods.

Mega Bridge Projects

Suitable for long-span river or valley crossings where girders exceed 500t.

Often used in conjunction with launching gantries for incremental launching.

Urban Overpasses & Interchanges

Facilitates rapid girder installation in congested urban areas with minimal disruption.

Special Bridge Types

Used for segmental bridges, box girder bridges, and steel truss bridges.

Can handle both simply supported and continuous span configurations.

 

 

The production procedure for a 700 ton bridge girder launching gantry involves several critical stages, including design, material procurement, fabrication, assembly, testing, and commissioning. Below is a structured outline of the production process:

1. Design & Engineering
Conceptual Design: Define load capacity, span length, lifting height, and mobility requirements.

Detailed Engineering:

Structural analysis (FEA for stress, deflection, and stability).

Mechanical design (launching mechanism, lifting system, hydraulic/pneumatic systems).

Electrical & control systems (automation, sensors, safety interlocks).

Regulatory Compliance: Ensure adherence to international standards (EN, AISC, GB, etc.) and safety codes.

2. Material Procurement
Structural Steel: High-grade steel (Q345B, Q460, or equivalent) for main beams, legs, and supports.

Hydraulic Components: Cylinders, pumps, valves, and hoses from certified suppliers.

Electrical Systems: Motors, PLCs, sensors, and cables.

Mechanical Parts: Gears, bearings, winches, and wheels/tracks for mobility.

3. Fabrication Process
A. Main Girder Fabrication
Cutting: CNC plasma/oxy-fuel cutting of steel plates.

Welding: Submerged arc welding (SAW) for longitudinal seams; manual welding for complex joints.

Assembly:

Segment fabrication (box girders or truss sections).

Fit-up and alignment using jigs and fixtures.

Full-length girder assembly with bolted/welded connections.

NDT Testing: Ultrasonic (UT) or radiographic (RT) testing for critical welds.

B. Support Legs & Towers
Fabrication of vertical/horizontal supports with stiffeners.

Integration of hydraulic lifting mechanisms (if applicable).

C. Launching Mechanism
Fabrication of pushing/pulling systems (hydraulic jacks, sliding pads).

Installation of guiding rails/tracks.

D. Lifting System
Assembly of hoists (electric or hydraulic winches).

Load testing of wire ropes, hooks, and pulleys.

4. Surface Treatment & Corrosion Protection
Blasting: Shot blasting to SA 2.5 (ISO 8501-1).

Painting:

Primer (epoxy zinc-rich).

Intermediate coat (epoxy mastic).

Topcoat (polyurethane for UV resistance).

5. Assembly & Integration
Erection of Main Girder: Using cranes or temporary supports.

Mounting Support Legs: Ensure verticality and stability.

Installing Mechanical/Electrical Systems:

Hydraulic power units.

Control cabinets and sensors.

Safety devices (limit switches, overload protection).

6. Factory Acceptance Testing (FAT)
Load Testing:

Static test (110% of rated load).

Dynamic test (simulated launching/lifting cycles).

Functional Checks:

Movement (longitudinal/transverse).

Synchronization of hydraulic systems.

Emergency stop response.

Deflection Measurement: Ensure compliance with design tolerances.

7. Disassembly & Transportation
Segment dismantling (if required for transport).

Packing with anti-corrosion protection.

Logistics planning for oversized components.

8. On-Site Assembly & Commissioning
Reassembly at the bridge construction site.

Final alignment and calibration.

Site acceptance test (SAT) under real conditions.

9. Operation & Maintenance Training
Operator training for safe handling.

Maintenance protocols (lubrication, inspection schedules).

 

 

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.

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