Single Truss Girder Gantry Crane

Key Features:

Single Truss Girder:

The main horizontal beam is constructed as a truss (a framework of triangular units), providing high strength with reduced weight compared to a solid box girder.

Offers good rigidity and load-bearing capacity while minimizing material usage.

Gantry Structure:

Supported by two legs (either fixed or adjustable height) that run on ground rails or wheels.

Can be semi-gantry (one leg supported by a building structure) or full gantry (both legs ground-supported).

Hoisting Mechanism:

Typically includes an electric hoist or chain block that moves along the girder via a trolley.

Can be manual, electric, or hydraulic depending on the application.

Mobility Options:

Fixed-height gantry: For consistent lifting heights.

Adjustable-height gantry: Allows flexibility in different work environments.

Rail-mounted: Moves along fixed tracks for precise positioning.

Wheel-mounted (mobile): Can be relocated as needed.

 

Comparison with Other Gantry Cranes

Feature	Single Truss Girder	Double Girder	Box Girder
Load Capacity	Medium (1-50T)	High (5-500T)	Medium-High
Cost	Low	High	Moderate
Weight	Light	Heavy	Heavy
Headroom Needed	Low	High	Medium
Best For	Workshops, Construction	Heavy industries	Precise, high-capacity lifts

 

Place of Origin:Henan, China

Warranty:2 years

Weight (KG):60000 kg

Video outgoing-inspection:Provided

Machinery Test Report:Provided

Application:warehouses,factory and other place

Crane type:box type gantry crane

Travelling speed:20m/min

Lifting mechanism:Electric Hoist

Control method:Ground Control+ Remote Control (customized)

Working duty:A5

Working Temperature:-20~+40℃

Industrial voltage:380V50HZ3Phanse or other

Color:Customised

Customization:Accepted

 

A single truss girder gantry crane consists of several key components that work together to enable lifting and moving heavy loads. Below is a detailed breakdown of its major parts:

 

1. Main Components of a Single Truss Girder Gantry Crane

A. Bridge Girder (Truss Structure)

The primary horizontal beam made of welded steel trusses (triangular frameworks).

Designed for high strength-to-weight ratio, reducing dead weight while maintaining load capacity.

Can be top-running (hoist moves on top of the girder) or under-hung (hoist suspended below).

B. Legs (Support Columns)

Two vertical supports (fixed or adjustable) that hold the girder.

Types:

Fixed-height legs – For consistent lifting height.

Adjustable legs – Allow height variation (e.g., telescopic or bolted extensions).

May include outriggers for additional stability.

C. End Trucks (Wheel Assemblies)

Located at the base of each leg, allowing the crane to move along rails or the ground.

Components:

Wheels/Tires (steel for rails, rubber for mobile cranes).

Drive motors (for powered movement).

Braking system (mechanical or hydraulic).

D. Hoist & Trolley

Electric or manual hoist – The lifting mechanism (chain hoist, wire rope hoist).

Trolley – Moves the hoist along the girder (manual push or motorized).

Hook block – Attaches to the load.

E. Runway Rails (for Rail-Mounted Gantries)

Steel tracks installed on the ground for smooth movement.

May include rail clamps to lock the crane in place.

                                         

F. Electrical System (for Powered Cranes)

Control panel (pendant, remote, or cabin-operated).

Power supply (cable reel or busbar for rail-mounted cranes).

Limit switches (to prevent over-travel).

G. Bracing & Reinforcements

Diagonal truss members to prevent twisting.

Cross beams for additional stability in wide spans.

2. Optional Components

Anti-collision system (for multiple cranes in the same area).

Anemometer & wind brakes (for outdoor use in windy conditions).

Variable frequency drives (VFDs) for smoother acceleration/braking.

Load cell & overload protection (safety feature).

Single Truss Girder vs. Box Girder Gantry Crane

Feature	Single Truss Girder	Box Girder
Weight	Lighter (open design)	Heavier
Rigidity	Good (triangular bracing)	Excellent (closed structure)
Cost	Lower (less material)	Higher
Maintenance	Easier (accessible)	More enclosed
Aesthetics	Industrial look	Cleaner appearance

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4. Common Applications

Workshops & Factories – Moving machinery.

Construction Sites – Lifting steel beams.

Shipping Yards – Loading containers.

Railway Maintenance – Handling tracks.

Sketch

Main technical

 

Single truss girder gantry cranes are widely used due to their cost-efficiency, lightweight design, and versatility. Here are their key advantages:

1. Lightweight Yet Strong Structure

The truss design (triangular steel framework) provides high strength with less material compared to solid box girders.

Reduces dead weight, making it easier to transport and install.

2. Cost-Effective

Requires less steel than double-girder or box girder cranes, lowering manufacturing costs.

Lower foundation requirements (due to lighter weight), reducing installation expenses.

3. High Load Capacity for Its Weight

Can handle 1 to 50+ tons (depending on design), making it suitable for medium to heavy lifting.

Ideal for workshops, warehouses, and construction sites.

4. Lower Headroom Requirement

Since it uses a single girder, it requires less vertical space than double-girder cranes.

Suitable for facilities with height restrictions.

5. Easy to Assemble & Relocate

Modular truss sections allow quick assembly/disassembly.

Mobile versions (with rubber wheels) can be moved easily to different work areas.

6. Versatile for Indoor & Outdoor Use

Can be used in warehouses, shipyards, construction sites, and railway yards.

Can be fitted with weather-resistant coatings for outdoor applications.

7. Low Maintenance

Open truss structure allows easy inspection and maintenance of components.

Fewer moving parts than double-girder cranes, reducing wear and tear.

 

These cranes are used in various industries due to their flexibility and efficiency. Common applications include:

1. Manufacturing & Workshops

Lifting machinery, molds, and heavy equipment.

Assembly line operations in automotive and steel fabrication plants.

2. Construction Sites

Handling steel beams, concrete panels, and prefabricated structures.

Moving materials in bridge and road construction projects.

3. Warehousing & Logistics

Loading/unloading heavy pallets, containers, and bulk materials.

Used in distribution centers and storage yards.

4. Shipping & Ports

Moving ship components, containers, and cargo in docks.

Often used as mobile gantry cranes for temporary lifting needs.

5. Railway & Metro Maintenance

Lifting rail tracks, locomotives, and bogies during repairs.

Used in railway depots and maintenance workshops.

6. Power Plants & Heavy Industries

Handling turbines, generators, and large industrial parts.

Maintenance of boilers and heavy mechanical systems.

7. Mining & Oil Fields

Transporting drilling equipment and pipes.

Used in offshore and onshore rigging operations.

 

The production procedure for a single beam traveling gantry crane involves several key stages, from design and material procurement to assembly, testing, and final delivery. Below is a step-by-step outline of the typical manufacturing process:

1. Design & Engineering
Customer Requirements Analysis: Determine lifting capacity, span, lifting height, duty cycle, and operating environment.

Structural Design:

Design the main girder (single box or I-beam structure).

Design end carriages (legs/wheels) and runway beams.

Select hoist/trolley type (electric or manual).

Load & Stress Calculations: Ensure compliance with standards (ISO, FEM, DIN, or ASME).

Electrical & Control System Design: Choose motors, brakes, limit switches, and control panels.

2. Material Procurement
Steel Plates & Profiles: High-quality Q235B/Q345B steel for main girders and supports.

Mechanical Components: Wheels, axles, bearings, gears, and couplings.

Electrical Components: Motors, cables, control panels, and safety devices.

3. Fabrication of Main Components
A. Main Girder Fabrication
Cutting: CNC plasma/oxy-fuel cutting for precision.

Welding: Automated submerged arc welding (SAW) for strong seams.

Straightening & Inspection: Ensure proper camber (pre-bend) and check for defects (UT/RT testing).

B. End Carriages & Legs
Frame Assembly: Welded steel construction with reinforced bracing.

Wheel & Bearing Installation: Machined wheels for smooth travel.

C. Hoist & Trolley
Pre-assembled Hoist: Electric chain hoist or wire rope hoist.

Trolley Frame: Fabricated to accommodate hoist movement.

4. Surface Treatment & Painting
Shot Blasting: Removes rust and improves paint adhesion.

Primer & Paint: Anti-corrosion coatings (epoxy + polyurethane).

5. Assembly
Girder & End Carriage Joining: Bolt or weld the main beam to legs.

Hoist/Trolley Installation: Mounted on the girder.

Electrical Wiring: Connect motors, controls, and safety devices.

6. Testing & Quality Control
Dimensional Inspection: Verify span, height, and alignment.

Load Testing:

Static Load Test: 125% of SWL (Safe Working Load).

Dynamic Load Test: 110% of SWL with operational checks.

Functional Tests: Travel, lifting, braking, and limit switch verification.

7. Disassembly & Packaging
For Shipment: Crane may be disassembled into modules (girder, legs, hoist).

Protective Packaging: Waterproof wrapping for sea transport.

8. Installation & Commissioning (On-Site)
Runway Preparation: Ensure level rails or ground support.

Reassembly: Bolt components together.

Final Testing: Operational checks under load.

9. Documentation & Delivery
Manual & Certificates: Include load test reports, CE/ISO certifications.

Training: Operator and maintenance guidance.

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%.