double-girder semi-gantry crane

Authentication mark:

This crane is mainly used in workshop loading bays, outdoor storage yards adjacent to buildings, and railway maintenance depots.

Capacity:

5 t – 100 t+ (Main hook + auxiliary hook configuration available)

Lifting Height:

4 m – 15 m (customizable based on site clearance)

Span:

6 m – 20 m

Voltage/Hertz:

3 Phase 380V 50hz/Customized

Working Class:

A5, A6, A7

Get A Free Quote

Introduction

Application Scenario

Advantages

Structural Diagram And Parameter Table

INTRODUCTION

What is this?

The double-girder semi-gantry crane is a special type of gantry crane with one leg running on a ground rail and the other leg running on a rail mounted on the building column. Through its double main beam structure with main and auxiliary hooks, combined with trolley and crane traveling, it achieves precise lifting and handling of heavy materials, large equipment, steel structures, and more. If your workshop has limited building height and cannot accommodate a standard overhead crane, but you still need high lifting height and strong load capacity, this product is designed for you.

Why choose a semi-gantry crane over a full gantry or overhead crane?

Compared to full gantry or overhead cranes, the semi-gantry solution offers four core advantages:

First, adapts to confined spaces – utilizes the building column rail on one side, eliminating the need for an independent elevated rail, especially suitable for workshops with insufficient height or unable to install overhead cranes.

Second, strong load capacity – double girder structure with large capacity design provides lifting capacity from 5 tons to over 100 tons, meeting heavy material handling requirements.

Third, greater lifting height – makes full use of the building clearance on one side, achieving higher effective lifting height than an overhead crane under the same building height.

Fourth, lower investment cost – compared to full gantry cranes, eliminates one side's elevated rail and large leg, significantly reducing civil and manufacturing costs.

Break through workshop space limitations with a more flexible structure.

What can we do for you?

We understand that every customer has different workshop structures, different capacity requirements, and different working areas. Therefore, we offer flexible customization options: lifting capacity from 5 tons to over 100 tons; span from 6 meters to 20 meters; main/auxiliary hook ratios such as 20/5t, 50/10t, etc.; control options of cabin, remote radio, or pendant; VVVF speed control optional. Whether your workshop is old with low clearance or new and spacious, we can match the most suitable span and lifting height.

Unsure? Don't know?

Not sure whether a semi-gantry or full gantry is more suitable for your workshop? Not sure what main/auxiliary hook capacity ratio you need? No problem. Just tell us: your building column height, your workshop span, and the maximum weight of the objects to be lifted. Our engineers will provide you with an accurate quote and CAD drawings within 24 hours. Click the button below or contact us via WhatsApp/email to get your customized solution.

💡 Tip: We offer free selection consulting. Even if you are unsure about specific parameters, feel free to describe your workshop structure and handling needs, and we will calculate for you.

APPLICATION SCENARIO

[1] Workshop Loading Bays – Handling heavy machinery, dies, or steel plates near bay doors with one side wall-mounted.

[2] Outdoor Storage Yards – Stacking and retrieving heavy materials (coils, pipes, concrete products) along building perimeters.

[3] Container Loading Areas – Lifting heavy cargo from trucks or containers with the wall-supported side saving floor space.

[4] Railway Maintenance Depots – Servicing locomotive components or heavy spare parts where building rails exist.

[5] Recycling Facilities – Moving heavy scrap bins or bales along a building edge.

ADVANTAGES

[1] High Load Capacity – Double-girder structure supports heavy loads from 5t up to 50t.

[2] Space-Saving Design – Eliminates one gantry leg, freeing up valuable floor space on one side.

[3] Rigid and Stable – Dual girders provide excellent stability and smooth load travel.

[4] Cost-Effective – Uses existing building structure for support, reducing steel and installation costs.

[5] High Duty Cycle – Designed for continuous operation with duty class up to A7.

STRUCTURAL DIAGRAM AND PARAMETER TABLE

Parameter	Specification
Working Class	A5, A6, A7
Capacity	5 t – 100 t+
Span	6 m – 20 m
Lifting Height	4 m – 15 m (customizable based on site clearance)
Lifting Speed	Main hook: 4 – 12 m/min Auxiliary hook: 6 – 15 m/min
Trolley Travelling Speed	35 – 45 m/min (VVVF optional for precise positioning)
Crane Travelling Speed	20 – 50 m/min
Control Method	Cabin control / Remote radio control / Pendant control
Power Supply	380V / 50Hz / 3-phase
Temperature	-20°C to +50°C
Protection Grade	Motor: IP54, Insulation class F or H
Girder Type	Double-girder with one rigid leg + one hinged leg or both rigid legs (semi-gantry configuration: one side rail on ground, one side on building column)

Six core advantages

Full Scenario Coverage

Nucleon covers over 20 product categories including ladle cranes, multi-purpose cranes, intelligent cranes, overhead/portal cranes, RTG, RMG, deck cranes, portal cranes, girder launchers, yacht cranes, KBK, and jib cranes. From steel smelting to port handling, bridge construction to ship equipment, Nucleon provides one-stop lifting solutions. Whether standard models or extreme-condition customizations, Nucleon possesses mature technical expertise and proven track records, saving customers from dealing with multiple suppliers.

Military-Grade Quality Standards

We use high-strength steel from Baosteel/Ansteel for key structural components, with 100% NDT inspection and one-clamp CNC gantry machining. Every machine undergoes 120% dynamic load and 125% static load tests before delivery, with continuous operation verification under extreme conditions. Even in 24/7 continuous casting plants, -40°C arctic ports, or high-temperature humid ship cabins, our cranes maintain millimeter-level precision and zero-drift stability—quality that stands the test of time.

Extended Longevity & Low Maintenance Cost

Our main girders are FEA-optimized and double-submerged arc welded, with a design life of ≥30 years. Key bearings are lifetime lubrication-free, and hardened travel wheels extend wear cycles by 3 times. Core components feature modular quick-change interfaces with spare parts commonality exceeding 80%. Annual maintenance costs are reduced by 40%~60%, saving millions in lifecycle operating expenses — truly "invest once, benefit long-term."

Energy Efficiency Leader

Our entire series comes standard with IE5 permanent magnet synchronous motors + energy feedback VFD drives, achieving 25%~35% comprehensive energy savings. Single-motor operation under light loads and adaptive speed control reduce electrical waste by over 30%. High-strength steel lightweight design cuts deadweight by 15%~20%, lowering workshop load requirements. A single ladle crane station saves over RMB 150,000 in electricity costs annually, helping customers achieve green and low-carbon production.

Ultimate Safety Redundancy Design

Our hoisting mechanism comes standard with dual brakes + mechanical overspeed switch + triple limit switches, featuring multiple redundant interlocks to prevent load dropping and over-traveling. Large products use box girder torsion-resistant structures, remaining stable even in level 8 gusty winds. Optional intelligent safety monitoring systems detect anomalies in load, skew, wind speed, etc., with automatic alarms and shutdowns. Overall safety redundancy coefficient > 2.0, maintaining zero crane safety incidents for many consecutive years.

Deep Customization & Full Lifecycle Service

We provide complete front-end support from site survey and mechanical simulation to civil review, delivering custom drawings within 2 weeks, with non-standard lead times only 5~7 days longer than standard products. We establish lifelong digital dossiers for customers, warning of end-of-life components 3 months in advance. Our full lifecycle services cover installation training, regular inspections, and remote O&M. With customer repeat purchase rates exceeding 85% for five consecutive years, we are a trustworthy long-term partner.