Freestanding Double Girder Crane for Timber Handling - Maldives Project
How Yuantai Built a Freestanding Double Girder Crane for Timber Handling in the Maldives

Project Overview

Freestanding Double Girder Overhead Crane for Timber Handling

Introduce the project in 2–3 short paragraphs.

Project: Maldives Timber Factory
Application: Timber processing and wood material handling
Crane: Freestanding double girder overhead crane
Hoist configuration: 2 × independent 3-ton electric wire rope hoist trolleys
Installation: 2020

The key point:

Yuantai supplied a freestanding double girder overhead crane designed to operate on its own runway support structure rather than relying directly on the timber factory's roof structure.

The system was customized around the workshop's available space, lifting clearance and material-handling requirements.

Why a Freestanding Overhead Crane Was Required

Why Choose a Freestanding Double Girder Overhead Crane?

This should be an important SEO and buyer-focused section.

The timber factory had several constraints:

• Existing workshop structure
• Limited overhead clearance
• Restricted installation space
• Need for independent crane support
• Long and bulky timber materials
• Humid, salty marine environment

A freestanding overhead crane provides its own supporting columns and runway system, allowing the crane to be installed without depending entirely on the existing building roof structure.

Key advantages for this project

• Independent support structure: The crane runway is supported by dedicated steel columns.
• Flexible workshop integration: The crane can be positioned according to the actual working area.
• Reduced dependence on building structure: The existing workshop does not have to carry the entire crane load through its roof structure.
• Suitable for customized layouts: The 9.093 m span and column arrangement were designed for the customer's workshop.

freestanding runway 

freestanding double girder overhead bridge crane system 

Customer's Timber Handling Requirements

Timber Factory Needed Two Independent Lifting Points

The main handling challenge was not simply lifting a heavy load.

The factory needed to move long and bulky timber materials.

A conventional single-hoist overhead crane provides one lifting point. For long timber, this can lead to:

• Load tilting
• Unstable lifting
• Excessive swing
• Difficult positioning

Yuantai therefore designed the crane with two independent 3-ton hoist trolleys on the same bridge.

The Engineering Challenge

Four Challenges in Designing the Freestanding Crane

Dual 3-Ton Hoist Configuration

The crane uses:

3-ton hoist trolley + 3-ton hoist trolley

Each hoist operates independently.

This provides two lifting points for long timber materials and gives the operator greater flexibility.

The configuration should be described as two independent 3-ton lifting units, rather than simply calling it a 6-ton crane.

Existing Workshop Dimensions

The freestanding double girder overhead crane had to fit the existing production area.

Customized span: 9.093 m

The runway and support columns were designed according to the workshop layout.

Limited Lifting Clearance

The customer required:

5.2 m lifting height

with approximately 5 m minimum clearance.

Yuantai therefore used a low-headroom configuration and optimized the bridge structure to maximize usable lifting height.

Maldives Marine Environment

The crane operates in a humid, high-salinity environment.

This creates a higher corrosion risk for:

• Bridge girders
• End carriages
• Runway structures
• Support columns
• Hoist components

The crane therefore received a dedicated anti-corrosion coating system.

Freestanding Crane Structure

freestanding workshop runway structrure 

freestanding runway column spaceing 

Self-Supporting Runway Structure for the Overhead Crane

This section should clearly establish why the project qualifies as a freestanding overhead crane.

Main components

Double Girder Bridge

• Top-running configuration
• 9.093 m span
• Reinforced for two hoist trolleys

Runway System

• P22 runway rail
• Dedicated runway structure

Support Columns

• HW300 × 300 × 10 × 15 H-beams

The freestanding structure creates an independent runway for the crane and allows the lifting system to serve the workshop without relying solely on the building's roof structure.

Dual Hoist Configuration

Two Independent 3-Ton Hoists on One Double Girder Bridge

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Why two hoists?

The two hoists provide:

• Two-point lifting
• Better support for long timber
• Improved load stability
• More flexible material positioning
• Independent operation for separate loads

This configuration allows the operator to distribute the lifting points along the timber rather than relying on a single central lifting point.

Low-Headroom Design

Low-Headroom Freestanding Double Girder Overhead Crane

The building had limited vertical clearance, so the crane was not designed around maximum standard dimensions.

Instead, Yuantai optimized:

• Hoist arrangement
• Trolley position
• Bridge girder dimensions
• Structural plate thickness
• Available lifting clearance

Result:
A 5.2 m lifting height within a space where building clearance was limited.

Corrosion Protection

Marine-Grade Corrosion Protection for Maldives

The Maldives location required additional attention to surface protection.

Coating system

This system was selected to provide enhanced protection against the humid and salty operating environment.

How the Crane Improves Timber Handling

More Stable Handling of Long Timber Materials

Instead of focusing on generic claims such as “higher efficiency,” explain the actual handling benefit.

With one lifting point

Long timber can:

• Tilt
• Swing
• Rotate
• Become difficult to position

With two lifting points

The operator can:

• Support the load at two positions
• Improve stability
• Reduce unwanted tilting
• Position long materials more accurately

This makes the dual-hoist freestanding overhead crane particularly suitable for timber processing workshops handling long products.

Technical Specifications

Freestanding Double Girder Overhead Crane Specifications

What Makes This Project Non-Standard?

Customized Freestanding Overhead Crane for an Existing Workshop

Use four concise points:

Dual Hoist

Two independent 3-ton hoist trolleys operate on one bridge.

Freestanding Structure

Dedicated support columns and runway structure provide independent crane support.

Low Headroom

The crane was optimized around the workshop's restricted vertical clearance.

Marine Protection

The coating system was adapted to the Maldives' humid and salty environment.

Project Results

A Compact Freestanding Crane Built Around the Workshop

The completed system provided the timber factory with:

• Independent overhead lifting infrastructure
• Two separate 3-ton lifting points
• Better handling of long timber materials
• 9.093 m workshop coverage
• 5.2 m lifting height
• Customized support columns and runway
• Low-headroom configuration
• Enhanced corrosion protection

The main lesson from this project is that a freestanding double girder overhead crane can be engineered around an existing workshop instead of forcing the customer to rebuild the building to accommodate a standard crane.

FAQ

Freestanding Double Girder Overhead Crane FAQs

1. What is a freestanding double girder overhead crane?

A freestanding double girder overhead crane uses an independent runway and support structure, typically including steel columns and runway beams, instead of relying directly on the building roof structure.

2. Why did the Maldives timber factory use a freestanding crane?

The factory had existing structural and space limitations. A freestanding system allowed Yuantai to provide an independent runway and customize the crane around the available workshop layout.

3. Why were two 3-ton hoists used?

Two independent hoists provide two lifting points, which is useful when handling long and bulky timber materials that are difficult to stabilize with a single lifting point.

4. Is the crane's total capacity 6 tons?

The crane has two independent 3-ton hoists. It should not automatically be treated as a conventional 6-ton single-hoist crane. Tandem lifting of one load requires appropriate engineering, controls and operating procedures.

5. Can a freestanding overhead crane be installed in an existing factory?

Yes. The runway, support columns, span and crane configuration can be engineered around the available workshop dimensions, provided the supporting structure and foundation are properly designed for the crane loads.

6. Can Yuantai customize a freestanding double girder overhead crane?

Yes. The crane can be customized according to lifting capacity, number of hoists, span, lifting height, runway length, duty class, workshop clearance, power supply and environmental conditions.

Need a Freestanding Double Girder Overhead Crane?

Have an existing workshop but limited roof capacity, restricted headroom or unusual material-handling requirements?Yuantai can design a freestanding double girder overhead crane with customized runway structures, support columns, hoist configurations and lifting heights.

Send us your lifting capacity, number of hoists, span, lifting height, workshop dimensions and operating environment for a customized solution.