Precast Concrete Gantry Crane

 

Key Features of Precast Concrete Gantry Cranes

High Load Capacity
Designed to handle 5–500+ tons, depending on application (e.g., small wall panels vs. large bridge girders).
Reinforced steel structures for durability in harsh industrial environments.

Precision Handling
Equipped with anti-sway systems (±10mm accuracy) for safe placement of precast elements.
Variable speed hoists for controlled lifting and lowering.

Customizable Span & Height
Adjustable spans (up to 35m) to cover large casting beds or storage areas.
High lifting heights for stacking precast components.

Durability & Corrosion Resistance
Hot-dip galvanized or epoxy-coated components to withstand concrete dust and moisture.

Automation & Remote Control
Semi-automated pre-programmed movements for repetitive tasks .
Radio remote control for operator flexibility and safety.

 

Core Components：Engine, Bearing, Gearbox, Motor, Gear

Place of Origin：Henan, China

Warranty：2 years

Weight (KG)：50000 kg

Video outgoing-inspection：Provided

Machinery Test Report：Provided

Application：Outdoor

Keywords：Gantry Crane

Rated Loading Capacity：50Ton

Cross travelling speed：44.6m/min

Long travelling speed：47.1m/min

Control way：cabin

Power supply：Cable reel

Steel track：QU80

Power：3-phase AC 50HZ 380V

 

 

1.Main Structural Components
Gantry Frame
Steel box girders (typically Q345B steel grade)
Adjustable span widths (8-35m common for precast applications)
Corrosion-resistant coatings (epoxy or hot-dip galvanized)

Support Legs
Fixed or adjustable height designs
Outrigger stabilizers for heavy lifts
Rubber-tired or rail-mounted options

End Carriages
Heavy-duty wheels with forged steel axles
Anti-derailment safety devices
Drive motor assemblies 

 

2.Lifting Mechanism
Hoist System
Wire rope hoists (10-500 ton capacity)
Dual-speed control (0.5-8 m/min fine positioning)
Overload protection sensors

 

Spreader Beam
Modular design for different precast shapes
Vacuum lifters or mechanical clamps
Rotator attachments for panel orientation

 

Trolley Assembly
Cross travel speed (10-30 m/min)
Anti-sway control system
Festoon cable management

3.End carriage

1)Structure & Design
Main Beam Connection: The end carriages are attached to the double girders, providing stability and load distribution.
Robust Steel Frame: Made from high-strength steel to withstand heavy loads and operational stresses.
Box-Type or Welded Structure: Ensures durability and rigidity.
2)Traveling Mechanism
The end carriage is equipped with a traveling system that moves the crane along the ground rails:
Wheel Assemblies: Large-diameter, high-strength steel wheels designed for smooth movement.
Drive Units (Motor & Gearbox):
Powered by electric motors (usually with a VFD for smooth acceleration and deceleration).
Gearboxes transmit power efficiently to the wheels.
Rail Clamps & Buffers (Optional): Prevents unwanted movement during strong winds.
Braking System:
Electromagnetic or Hydraulic Brakes to ensure safe stopping.
Emergency Stop System for additional safety.

4.Crane travelling mechanism

Traveling Drive System
The crane moves along the ground rails using motorized drive units, consisting of:
1)Driving Motors:
Typically three-phase asynchronous motors.
May use Variable Frequency Drive (VFD) for smooth acceleration, speed control, and energy efficiency.
2)Gearbox & Transmission System:
The motor drives a hardened gearbox that reduces speed and increases torque.
Uses helical or planetary gears for efficient power transmission.
3)Wheel System:
Driven Wheels: Powered by the motors and gearboxes.
Idle Wheels: Free-moving support wheels to balance the load.
Material: Forged steel with heat treatment for durability.
Flanged design to keep the wheels securely on the rail track.
4)Braking System:
Electromagnetic or hydraulic brakes for controlled stopping.
Emergency brakes for additional safety.

5.Trolley travelling mechanism

1)Structural Components
Trolley Frame:
A heavy-duty steel frame that houses the hoisting mechanism.
Designed to move smoothly along the top flange of the double girders.
Trolley Wheels:
Four or more wheels, depending on the design.
Made of forged steel with heat treatment for durability.
Flanged wheels to prevent derailment.
2)Safety & Control Features
Limit Switches: Prevent over-travel beyond the designated range.
Braking System:
Electromagnetic or hydraulic brakes ensure controlled stopping.
Emergency brakes for additional safety.
Anti-Slip & Anti-Skew Systems: Ensures smooth movement and prevents misalignment.
Overload Protection: Prevents excessive loads from damaging the system.

6.Crane wheel

1)Types of Crane Wheels
A 20-ton double girder goliath gantry crane typically uses the following types of wheels:
Driven Wheels: Connected to the motor and gearbox, providing movement.
Idle Wheels (Non-driven): Support the crane's weight and roll freely.
Flanged Wheels: Have a raised edge (flange) to keep the crane aligned on the rails.
Double-Flanged Wheels (Optional): Provide extra stability for high-precision applications.
2)Material & Manufacturing Process
Material:
High-strength forged steel (e.g., 42CrMo, 65Mn, or ZG430-640).
Heat-treated for high wear resistance and durability.
Hardness:
Surface hardness: HRC 40–50 (for wear resistance).
Core hardness: Lower to maintain toughness.
Manufacturing Process:
Forging → Machining → Heat Treatment → Final Grinding & Testing.

7.Crane Hook

1)Types of Crane Hooks
The choice of hook depends on the lifting application:
Single Hook:
Used for general lifting applications.
Simple design with a rotating swivel to prevent twisting.
Double Hook:
Used for wide or heavy loads to ensure even weight distribution.
Provides better stability than a single hook.
Forged Hook vs. Laminated Hook:
Forged Hook: Made from a single piece of high-strength steel, stronger and more durable.
Laminated Hook: Made from multiple steel plates, used for extra safety (reduces risk of sudden failure).
2)Material & Manufacturing
Material:
High-strength carbon steel or alloy steel (e.g., 20MnSi, 34CrMo4).
Designed to handle high loads and resist deformation.
Heat Treatment:
Increases hardness and durability.
Reduces wear and extends service life.
Safety Factor:
Typically 4:1 or 5:1 to ensure safe lifting operations.

8.Motor

Features & Specifications
1)Power Supply:
Three-phase power supply is the standard, as it provides a more balanced, efficient, and reliable power source for heavy-duty applications.
Frequency: Typically 50 Hz or 60 Hz, depending on local electrical standards.
2)Enclosure & Protection:
IP54 or IP55 protection rating to protect against dust and water.
Class F or H insulation to handle higher operating temperatures.
Cooling system: Most motors are equipped with forced ventilation or cooling fans to prevent overheating during extended operations.
3)Starting System:
Star-Delta (Wye-Delta) or Autotransformer starters for smooth motor startup and to reduce inrush current.
Soft Starter or VFD: Often used for trolley and traveling motors to gradually ramp up the speed, improving the longevity of the motor and reducing mechanical stress.

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9.Sound and light alarm system & limit switch

1)Sound and Light Alarm System
The sound and light alarm system provides visual and audible alerts to warn of specific crane operating conditions such as approaching overload, limit range, or emergency situations.
2)Limit Switches
Limit switches are safety devices that prevent the crane from exceeding its designed operational range. These switches are critical for ensuring safe operation and avoiding mechanical damage or safety hazards.

10.Safety Devices

1)Overload Protection System
Purpose: Prevents the crane from lifting loads beyond its rated capacity, which could lead to structural damage or catastrophic failure.
2)Limit Switches
Purpose: Ensures the crane does not exceed its designed operational limits, preventing mechanical damage or dangerous operation.
3)Emergency Stop System
Purpose: Provides a quick shutdown mechanism for all crane operations in case of an emergency.
4)Anti-Collision System
Purpose: Prevents the crane from colliding with nearby objects, other cranes, or structures, improving safety in environments with multiple cranes.
5)Sound and Light Alarm System
Purpose: Warns nearby personnel of crane movements and abnormal conditions.
6)Anti-Sway System
Purpose: Reduces load swing during crane movements, improving safety, precision, and load control.
7)Brake Systems
Purpose: Provide secure stopping and hold capabilities for the crane, preventing movement when it's not desired.

11.Control Systems

Operator Interface

Pendant control (IP65 rated)

Radio remote (300m range typical)

Cabin control options with camera systems

Electrical Systems

Variable frequency drives (VFDs)

Emergency stop circuits

Power feed systems (cable reel or busbar)

 

12.Sketch

 

Main technical

 

 

 

Advantages of Precast Concrete Gantry Cranes
High Load Capacity & Precision Handling
Can lift 5–500+ tons, ideal for heavy precast elements like bridge girders and wall panels.
Anti-sway technology ensures ±5mm placement accuracy, critical for modular construction.

 

Customizable for Various Precast Shapes
Interchangeable spreader beams, vacuum lifters, and rotating clamps adapt to different components (slabs, columns, beams).
Adjustable span (8–35m) and lifting height to suit production layouts.

 

Faster Production Cycles
3–5× faster than mobile cranes for repetitive tasks (e.g., moving molds or stacking panels).
Automated features (pre-programmed paths, RFID tracking) reduce manual labor.

 

Durability in Harsh Environments
Corrosion-resistant coatings (epoxy/galvanized) withstand concrete dust and moisture.
M7/M8 duty class motors for 24/7 operation in precast plants.

 

Safety & Reduced Labor Costs
Load sensors, collision avoidance, and emergency brakes minimize accidents.
One operator can manage multiple lifts via remote control, cutting labor needs by 50%.

 

 

Applications in Precast Concrete Industry

Application	Crane Type	Key Features
Precast Manufacturing Plants	Double girder gantry	High-speed hoists for mold handling
Construction Sites	Mobile gantry crane	Easy relocation for on-site assembly
Storage Yards	Rubber-tired gantry (RTG)	Stacking precast slabs & beams
Bridge Girder Installation	Heavy-duty gantry	500+ ton capacity for large spans

 

 

1. Design & Engineering
Requirement Analysis: Determine specifications, including span, height, duty cycle, and environmental conditions.
CAD Drawings & Load Calculations: Engineers design the crane structure, ensuring compliance with international safety standards like FEM, CMAA, or ISO.
Selection of Key Components: Includes double girders, end carriages, trolley mechanism, hoisting system, and electrical controls.
2. Material Procurement
Structural Steel: High-strength steel plates and beams for girders, legs, and supporting structures.
Hoisting Mechanism: Motor, gearbox, wire rope, and drum are sourced.
Electrical & Control Components: Inverters, limit switches, PLC, and control panels.
3. Fabrication of Structural Components
Double Girder Manufacturing
Cutting: Steel plates are cut into precise shapes.
Welding: Girders are welded using submerged arc welding (SAW) to ensure strength.
Machining: Precision machining for proper alignment of rails and trolley.
Legs & End Carriages
Welded and machined for smooth wheel and rail movement.
Installation of rail tracks for trolley motion.
4. Assembly of Mechanical & Hoisting Components
Trolley & Hoist System
Gearbox, motor, drum, rope guide, and safety brakes are assembled.
Wire rope is wound on the drum.
Drive Mechanism Installation
Motors and reducers are installed on the end carriages.
Wheels are assembled with proper alignment to ensure smooth movement.
5. Electrical System Installation
Control Panel Assembly: Includes VFD, contactors, and safety relays.
Wiring & Connections: Motor wiring, limit switches, and emergency stop system.
Remote Control & Cabin Installation: Depending on client requirements, either a radio remote control or operator cabin is installed.
6. Testing & Quality Control
Mechanical Testing:
Load testing with 1.25 times the rated capacity.
Checking trolley movement and hoisting performance.
Electrical Testing:
Verification of motor speeds, limit switches, and control panel operations.
Emergency brake function tests.
Safety Inspections:
Ensuring compliance with OSHA, ISO, or local safety regulations.
7. Surface Treatment & Painting
Sandblasting: Removes rust and prepares metal surfaces.
Priming & Painting: Corrosion-resistant epoxy primer followed by industrial-grade paint.
8. Packaging & Transportation
Component Packing: Each part is securely packed for transport.
Loading & Shipping: Loaded onto trucks or containers for delivery.
9. Installation & Commissioning
On-site Assembly: Main components are bolted and welded into place.
Final Testing: Load testing at the installation site to ensure full functionality.
Handover & Training: Operator training and final approval from the client.
10.Final Deliverables
Complete Gantry Crane System with operational manuals.
Warranty & After-Sales Support for long-term maintenance.

Workshop view:

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%.