Double Girder Gantry Truss Crane

A double-girder gantry truss crane is a large lifting device with a double girder gantry as its main load-bearing structure and a truss design. It combines the high load-bearing capacity of a double girder structure with the lightweight characteristics of a truss design, and is widely used in scenarios that require large spans and heavy loads.

The double main beams are supported on the ground tracks by the end beams (gantry legs) at both ends, forming a movable “gantry” frame. The hoisting trolley runs horizontally along the main beam tracks, and the gantry frame as a whole can move longitudinally along the ground tracks, thereby achieving full coverage of the work area.

Unlike single-girder cranes, these cranes have two parallel main girders connected by end beams to form a gantry structure. The double-girder design significantly increases the load capacity of the equipment, enabling it to handle hundreds of tons or even higher lifting capacities. At the same time, it offers superior structural stability and stronger lateral bending and torsional resistance when operating over long spans (typically 20 meters or more).

Description

The double-girder flower rack gantry crane is a large lifting device that combines high-efficiency lifting with stable operating performance.

Its core structure adopts a double main beam truss design, with two main beams and secondary beams made of high-strength steel working together to form a stable load-bearing frame. Not only is it lighter in weight, reducing pressure on the ground foundation, but it also has a strong load-bearing capacity, capable of handling the hoisting of heavy cargo.

In terms of mechanical performance, it is equipped with a precise lifting mechanism, a flexible walking mechanism, and an efficient trolley running mechanism. These three mechanisms work together to lift heavy objects vertically and move them horizontally, ensuring the precision and safety of hoisting and handling operations.

The double-girder design further enhances the overall stability of the equipment, enabling it to maintain good operating conditions even during large-span operations.

Widely applicable, it is often used in container loading and unloading at ports and terminals, ship section hoisting at shipyards, large steel material handling in heavy industrial factories, and building material hoisting at construction sites. With its reliable performance, it provides strong support for various heavy-duty operations.

Features

Double main beam load reinforcement: A truss structure with two parallel main beams is used, forming a rigid support system through a combination of steel trusses, which increases the load capacity by 40%-60% compared to single-beam models. The main beam spacing is adjusted according to the tonnage (e.g., 3.5 m for a 20-ton model), which effectively distributes the load, reduces deflection deformation, and is suitable for long-term heavy-duty operations.

Maintenance convenience design: A dedicated maintenance walkway (width ≥ 0.8 m) is provided between the two main beams, equipped with safety railings and ladders, allowing direct access to core components such as the hoisting mechanism and trolley running mechanism. Routine inspections and maintenance can be performed without the need for additional scaffolding, resulting in a 60% reduction in maintenance labor hours compared to single-beam models.

Multiple safety features: In addition to the standard lift height limit and travel limit, new features include main beam deflection monitoring, wind resistance braking system (such as rail clamps + anchoring devices), and double beam synchronization monitoring. These features comply with the GB/T 3811-2008 heavy-duty safety standard and can be certified by international organizations such as CE and ISO.

Highly customizable adaptability: Can be equipped with dual trolleys (for dual hook coordination), rotating lifting gear (360° rotation), anti-sway system (sway amplitude ≤ 3°), etc., according to operational requirements. It can even be integrated with an automated control system to achieve unmanned operation, making it suitable for high-end applications such as intelligent ports and heavy machinery factories.

Modular assembly: Main beams, legs, flower racks, and other components can be disassembled for transportation and assembled on site using high-strength bolts, reducing the need for hoisting equipment by 50% compared to integral double-beam models. However, due to the increased structural complexity, the installation and commissioning period is 30%-40% longer than that of single-beam models, and requires a professional team to perform precision calibration.

Technical Data

Capacity1t2t3.5t5t10t16t20t
Span8-16m10-18m12-20m12-22m14-25m16-28m18-30m
Lifting height6-12m6-14m8-16m8-18m10-20m12-24m
Work DutyA4A5A5-A6A6
Lifting speed8/0.8m/min6/0.6m/min5/0.5m/min4/0.4m/min
Hoist Traveling Speed聽20-30m25-35m30-40m
Crane Traveling Sprrd25-40m30-50m30-60m
Railp30p30-p38p38-QU70QU70-QU80QU80-QU100QU100QU100-QU120

Purchasing Process

FAQs About Choosing the Right Gantry Crane and Supplier

In order to obtain accurate quotes for custom overhead cranes, providing the following core information will greatly improve efficiency:

1. Key specifications: including rated lifting weight (tons), span (i.e., track spacing, meters), and lifting height (meters), which is the basis of the design.
2. Use environment and working conditions: Explain the conditions of the installation site (such as indoor/outdoor, temperature, humidity) and work level (busy level), which determines the material selection and configuration level of the structure.
3. Specific configuration requirements: clarify the drive mode (such as frequency conversion control), brand preferences for electrical components, safety devices (such as overload limiters, anti-collision systems), and whether special functions such as remote control are required.
4. Installation and service: confirm the on-site power supply conditions (voltage, frequency), installation conditions, and specific expectations for delivery time, installation and commissioning, and after-sales service.

The more detailed the information provided, the more accurate and reliable the solutions and quotations obtained.

1. Span and lifting capacity: this is the foundation.The larger the span and the higher the rated lifting weight, the material and design costs of the main beam and structure will increase significantly, and the higher the price.

2. Working level and frequency of use: The working level (A1-A8) represents the busy level and load status of the crane.Cranes with frequent and heavy-duty use require more durable motors, gearboxes and structural parts, and the cost is naturally higher than that of lightweight and occasionally used equipment.

3. Structure and configuration: The double beam is more complex and stable than the single beam structure, and the price is higher.At the same time, the lifting height, operating speed, motor brand, control system (ordinary vs frequency conversion), and the level of safety devices (such as anti-swing, load monitoring) all directly affect the final quotation.

4. Degree of customization and brand service: completely standard models have lower costs.The customized design based on the workshop environment (such as explosion-proof and high temperature), special processes (such as metallurgical special), brand added value, and after-sales guarantee system will all be reflected in the price.

In simple terms, when buying a bridge crane, it is necessary to consider “how much, how frequently, what environment and what configuration”, which determine its core value and price.

Which crane to choose mainly depends on your specific needs. You can quickly judge from the following four core aspects:

-Single-beam bridge crane: it is suitable for conventional workshops with light and medium loads (usually ≤20 tons), medium span, and low frequency of use. It is the most economical and versatile choice.
-Double-girder bridge crane: used for heavy-duty, long-span, or high-work-level occasions (such as frequent hoisting, metallurgy, heavy-duty assembly). Its stability, durability, and safety are higher, but the cost is also increased accordingly.
-Free vertical crane (cantilever/column type): suitable for fixed working points and working conditions with limited rotation range, such as beside machine tools, maintenance areas, or production line stations, it can efficiently use corner space and be installed flexibly.
-Grab crane: It is specially used for the handling, loading, and unloading of bulk materials (such as grain, coal, sand, and gravel). The only reason to choose it is that you need to deal with such unpackaged loose materials.

In simple terms, you can filter according to this logic:

First, according to the lifting weight and span, choose between a single beam and a double beam.
If the scope of operation is highly concentrated and the space is limited, consider a free vertical.
If the handling object is bulk material, it points directly to the grab type.

Yes. Our bridge cranes fully comply with and follow relevant international standards. Our company has passed a number of international certifications, such as the ISO 9001 quality management system, which guarantees that the management system ensures every aspect of the product, from design to delivery, is under high standards of quality control. Therefore, you can rest assured that our cranes are internationally competitive in terms of safety and quality.
 
In order to ensure the versatility, safety, and reliability of our products on a global scale, we strictly follow the mainstream international standard systems, including the International Electrotechnical Commission (IEC), European (EN/DIN), and the United States (ANSI/ASME) in the design and manufacturing process. For example, for the EU market, our products meet the detailed requirements of the Machinery Directive and CE certification. At the same time, we also actively adapt to specific regulations in other regions to meet the compliance needs of different customers.

Delivery times largely depend on whether the crane is standard or customized. Based on our experience, standard single-girder and double-girder cranes can be produced more quickly, while cranes with special spans, duty ratings, or environmental requirements naturally require additional engineering design time.

For each quotation, we provide an estimated production and delivery schedule based on your configuration and destination. Throughout the manufacturing process, our team maintains communication with the customer to ensure no unexpected issues arise before shipment.

Compared with many suppliers, Yangyumech mainly reflects the two differentiated advantages of high customization flexibility and clear international compliance when providing bridge cranes.

On the one hand, we focus on in-depth customized services. According to your specific needs, we can provide fully customized solutions on core parameters such as rated load capacity, span, and lifting height, and accept personalized requirements. This means that what you get is not a standard product, but exclusive equipment that accurately matches the working conditions of your workshop.

On the other hand, we attach importance to international standards and quality certification. Our products clearly meet the requirements of international certifications such as CE, which ensures that their safety and reliability can meet the mainstream standards of the international market, and provides you with additional quality confidence guarantees. Combined with our direct supply capabilities as a powerful factory, we can achieve better comprehensive value for you while obtaining compliant and customized products.

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Yangyumech is a leading professional manufacturer of cranes in China. Our company integrates the processes of crane research and development, manufacturing, sales and service.