Single Girder Truss Gantry Crane

A Single Girder Truss Gantry Crane is an efficient, economical choice for medium-load, long-span applications where weight reduction and cost savings are priorities. Its modular design allows customization for indoor/outdoor use, making it versatile across industries.

Key Features
Lightweight & Cost-Effective

The truss design reduces material usage, lowering manufacturing costs while maintaining structural integrity.

Ideal for applications where budget constraints are a concern.

Moderate Load Capacity

Typically handles 1–50 tons, making it suitable for general material handling, assembly lines, and storage yards.

Customizable Span & Height

Span range: 5–35 meters (some models up to 60m).

Adjustable legs for varying working heights (up to 40m in some configurations).

Mobility Options

Rail-mounted: For fixed-path operations in shipyards or container yards.

Rubber-tired: For flexible movement in workshops or construction sites.

Portable models: Quick assembly/disassembly for temporary use.

Hoist & Trolley System

Equipped with electric wire rope hoists (CD/MD type) or chain hoists for vertical lifting.

Manual or motorized trolleys for horizontal movement along the girder.

Durability & Weather Resistance

Galvanized or painted steel for corrosion resistance in outdoor use.

Some models comply with FEM, DIN, and ISO standards for safety and reliability.

Comparison: Single Girder Truss vs. Solid Web Gantry Cranes

Rated Loading Capacity：5 ton, 10 TON, 100 ton, customized, 16/3.2 ton, 20/5 ton, 32/5 ton, 50/10 ton

Max. Lifting Height：40m, customized

Span：35m or clients' demands

Warranty：1 Year

Weight (KG)：50000 kg

Core Components：PLC, Engine, Bearing, Gearbox, Motor, Pressure vessel, Gear, Pump

Control way：Cab, wireless remote control or customized

A Single Girder Truss Gantry Crane is a type of light-to-medium-duty gantry crane with a truss-type girder, typically used for outdoor applications such as construction sites, precast yards, or small factories. The truss design offers reduced wind resistance and lighter self-weight while maintaining structural strength.

Main Components & Their Functions
1. Truss Girder (Single Girder)
Structure: A lightweight lattice (truss) beam made from welded steel bars.

Function: Supports the hoist and load while reducing wind load and total crane weight.

Advantage: Ideal for outdoor environments with frequent wind exposure.

2. Supporting Legs (Gantry Legs)
Design: Two vertical columns that support the truss girder.

Function: Transfer load from the girder to the ground.

Variants: Can be A-frame, box-type, or truss-type depending on load and span.

3. End Carriages / Ground Wheels
Function: Enable the crane to move longitudinally along ground rails.

Includes: Drive motors, brakes, and travel wheels.

Power Options: Electric drive or manual push-pull (for very light-duty versions).

4. Hoist or Trolley Mechanism
Usually an electric wire rope hoist or electric chain hoist, mounted under the truss girder.

Function: Performs vertical lifting and side-to-side (cross travel) movement along the girder.

Trolley: May be fixed or motorized, depending on application.
 

5. Electrical System
Power supply via cable reel, cable festoon, or drag chain system.

Control panel to operate lifting and traveling.

Control methods:

Pendant control

Wireless remote control

6. Crane Rails / Track
Laid on the ground for the crane to move longitudinally.

Made of steel track embedded in concrete or bolted on the floor.

7. Safety Devices
Limit switches (hoist upper/lower, travel end)

Overload protection

Emergency stop

Warning alarms and lights

Windproof anchoring (important for outdoor use)

.

Optional Components
Adjustable height columns (for variable lifting height)

Rubber buffers or mechanical stops

Rain covers or sunshades for hoist

Anti-wind anchors or rail clamps

SKETCH

Wind Resistance
The open truss structure reduces wind drag, making it ideal for outdoor use.
Lightweight Design
Truss construction uses less material while maintaining strength, which reduces foundation load and installation cost.
Cost-Effective
Cheaper than box girder cranes in terms of material, fabrication, and transport.
Easy Installation
Lightweight components are easier to assemble and dismantle on-site.
Customizable Span & Height
Suitable for various working conditions with adjustable sizes.
Energy Efficient
Requires smaller drive motors due to reduced self-weight.
Durable in Harsh Conditions
Performs well in windy, dusty, or uneven outdoor sites.

This crane type is widely used in medium and light-duty lifting tasks, especially in open environments.

1. Precast Yard & Concrete Factories
Moving precast slabs, beams, columns, and molds.

2. Construction Sites
Lifting steel structures, rebar, scaffolding, and equipment.

Easy to relocate as the project progresses.

3. Highway & Bridge Construction
Handling formwork, concrete segments, and bridge beams.

Ideal due to wind resistance and outdoor durability.

4. Warehouses & Yards
Outdoor material storage areas where a roofed structure isn't available.

Handles pipes, steel bars, wooden crates, etc.

5. Fabrication Workshops
Moving lightweight components like sheet metal, machine parts, and assembly tools.

6. Small Shipyards or Boat Yards
Transporting boat parts, engines, or maintenance equipment.

1. Design and Engineering

Detailed Engineering: Develop detailed engineering drawings and specifications, including the main beam, hoist, trolley, end carriages, and other components.

Simulation and Modeling: Use computer-aided design (CAD) and simulation tools to model the crane's performance and optimize its design.

2. Material Selection

Material Specifications: Select high-quality materials that meet the requirements for strength, durability, and heat resistance. Common materials include high-strength steel, alloys, and specialized coatings.

Procurement: Source materials from approved suppliers, ensuring they meet the necessary quality and certification standards.

3. Component Fabrication

Cutting and Shaping: Cut and shape raw materials into the required components, such as beams, columns, and brackets. This may involve processes like plasma cutting, laser cutting, and machining.Welding and Assembly: Weld components together to form the crane's structural elements. This includes welding the main beam, end carriages, and other load-bearing parts.

4. Assembly

Sub-Assembly: Assemble individual components, such as the hoisting system, trolley, and end carriages, into sub-assemblies. This involves fitting parts together and ensuring proper alignment.Main Assembly: Combine sub-assemblies to construct the complete crane structure. This includes mounting the hoist and trolley on the main beam, attaching the end carriages, and installing the control systems.

5. Integration of Systems

Electrical Systems: Install electrical components, including motors, control panels, wiring, and sensors. Ensure that the crane's electrical systems are properly integrated and tested.

Control Systems: Implement and configure control systems, such as programmable logic controllers (PLCs), remote controls, and safety devices. Verify that the control systems function correctly and are calibrated.

6. Testing and Quality Assurance

Pre-Operational Testing: Conduct pre-operational tests to check the crane's functionality, including load testing, operational testing of the lifting and traveling mechanisms, and control system checks.

Safety Testing: Verify that safety features, such as limit switches, alarms, and emergency stops, are working correctly and meet safety standards.

Inspection: Perform a detailed inspection of the crane's structure and components to ensure compliance with design specifications and quality standards.

7. Final Adjustments and Calibration

Fine-Tuning: Make any necessary adjustments to optimize the crane's performance and ensure smooth operation. This may include calibrating sensors, adjusting controls, and fine-tuning the lifting system.

Documentation: Prepare and review documentation, including operation manuals, maintenance guides, and safety instructions.

8. Delivery and Installation

Transport: Arrange for the transport of the crane to the installation site, ensuring that it is handled and shipped safely to prevent damage.

Installation: Oversee the installation of the crane at the customer's facility, including assembly, alignment, and connection to power sources and control systems.

Training: Provide training for operators and maintenance personnel to ensure they are familiar with the crane's operation and safety procedures.

9. Commissioning and Handover

Commissioning: Conduct final commissioning tests to verify that the crane operates correctly under real-world conditions and meets performance specifications.

Handover: Officially hand over the crane to the customer, providing all necessary documentation, including certificates of compliance, warranty information, and maintenance schedules.

Material Inspection

Quality Inspection: Strict quality inspection is carried out on the purchased raw materials to ensure that they meet the design requirements and national standards.

Material Storage: Qualified materials are stored according to classification to prevent corrosion or damage.

Cutting and Forming

Steel Cutting: Use plasma cutting, laser cutting or flame cutting and other technologies to cut the steel according to the size of the design drawing.

Forming Processing: Form the steel plate through bending, rolling, welding and other processes to manufacture the main beam, end beam and other structural parts.

Welding

Component Welding: The cut and formed steel parts are welded into the main structures such as the main beam, end beam and trolley. The welding process needs to be strictly controlled to ensure the structural strength and welding quality.

Weld Inspection: Use non-destructive testing technology (such as ultrasonic testing, radiographic testing) to inspect the welds to ensure that there are no cracks or other defects.

Machining

Precision Machining: Precision machining is performed on the key components of the crane, such as wheel sets, bearing seats, pulleys, etc., to ensure their dimensional accuracy and surface quality.

Assembly of the whole machine

General assembly: On the basis of pre-assembly, the overall assembly of the crane is carried out, including the final installation of the main beam, end beam, lifting mechanism, walking mechanism, etc.

Commissioning and testing

Under dynamic conditions, the operating performance of the crane is tested, including the testing of lifting, walking, steering and other functions. The overall size of the assembled bridge crane is checked to ensure that all dimensions meet the design requirements.

Spraying and anti-corrosion treatment

Surface treatment Rust removal: Rust removal on the surface of the crane, common methods include sandblasting, pickling, etc. Primer spraying: Spray anti-corrosion primer on the treated surface to prevent metal oxidation and corrosion. Topcoat spraying Color spraying: Spray topcoat according to customer requirements or industry standards to give the crane a protective and decorative effect. Marking: After spraying, mark the crane's identification information in accordance with the specifications, such as model, rated load, etc.

Factory and installation

Packaging and transportation

Packaging protection: Protectively package the key components of the crane to prevent damage during transportation. Transportation arrangement: According to the equipment size and transportation conditions, select a suitable transportation method to transport the crane to the customer's site.

Acceptance and delivery

Customer acceptance

On-site acceptance: The customer conducts on-site acceptance of the crane according to the contract requirements and technical specifications to check the performance and quality of the equipment.

Problem rectification: If any problems are found, the manufacturer needs to rectify them in time to ensure that the equipment fully meets the customer's requirements. Delivery and use Operation training: The manufacturer usually trains the customer's operators to ensure that they can operate the crane correctly and safely.

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