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A Type Double Girder Gantry Crane

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A type double girder gantry cranes are mainly applied in industries such as steel stockyards, port terminals, precast concrete factories, heavy equipment assembly yards, and railway freight stations.

Capacity:

5 t – 100 t (customizable up to 500t)

Lifting Height:

6 m – 30 m (customizable based on site clearance)

Span:

18 m – 50 m customizable

Voltage/Hertz:

3 Phase 380V 50hz

Working Class:

A5, A6, A7

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Introduction

Application Scenario

Advantages

Structural Diagram And Parameter Table

INTRODUCTION

An A-Type Double Girder Gantry Crane (commonly designated as Model MG) is a heavy-duty, rail-mounted crane featuring two main bridge girders supported by "A"-frame legs on both sides. The hoisting trolley runs along rails mounted on top of the main girders, while lower crossbeams connect the legs to form a highly rigid triangular geometric structure.

APPLICATION SCENARIO

Open Steel & Material Storage Yards: Efficient handling, stacking, and loading of heavy steel plates, pipes, structural beams, and coils.
Precast Concrete & Bridge Construction: Transporting heavy concrete girders, segments, and preformed slabs in outdoor production yards.
Shipbuilding & Heavy Equipment Manufacturing: Moving heavy machinery components, hull sub-assemblies, and industrial raw materials.
Mining & Bulk Material Handling: Operating with grabs or magnet attachments to move bulk materials, scrap metal, or raw minerals.
Rail Logistics & General Freight Terminals: Unloading and loading heavy non-containerized cargo and general freight onto railcars and flatbed trailers.

ADVANTAGES

Advantage Feature	Technical & Operational Value
Exceptional Structural Stability	Triangular Rigidity: The iconic "A" frame leg design forms a stable geometric triangle, providing superior resistance against side loads and strong outdoor wind forces.
High Load Capacity & Wide Spans	Heavy-Duty Power: The double-girder configuration supports massive load capacities (typically 5t to 500t+) and wide spans (12m to 50m+) for extreme industrial demands.
High Cost-Efficiency & ROI	Economical Structural Design: Requires less steel weight relative to its strength compared to some specialized leg structures, making it highly cost-effective for standard outdoor material handling.

STRUCTURAL DIAGRAM AND PARAMETER TABLE

Parameter	Specification
Working Class	A5, A6, A7
Capacity	5 t – 100 t
Span	18 m – 50 m
Lifting Height	6 m – 30 m
Lifting Speed	Main hook: 4 – 12 m/min Auxiliary hook: 6 – 15 m/min
Trolley Travelling Speed	35 – 45 m/min
Crane Travelling Speed	20 – 50 m/min (VVVF optional for smooth start/stop
Control Method	Cabin control / Remote radio control / Pendant control
Power Supply	380V / 50Hz / 3-phase
Leg Type	A-frame
Cantilever	Single cantilever / Double cantilever / No cantilever
Girder Type	Double girder – two box-section main beams with full-penetration welding

NUCOLLEN CERTIFICATE

Nukollen Possesses A Wide Range Of Complete Certification Documents Including Those For Ships, Port Equipment Factories, Etc. If You Need Them, Please Feel Free To Request The Detailed Certification Files From Us.