Double-girder Semi-Gantry Crane

The double-girder semi-gantry crane is a type of gantry crane. Its gantry frame has support legs on one side only, with the other side supported by factory columns or wall-mounted rails. This design has the same operational range advantages as gantry cranes, but it doesn't need as much space. This makes it perfect for lifting operations in small spaces, like factory extension zones, open-air yards, and workshop interfaces.

Compared to full gantry cranes, double-girder semi-gantry cranes mean that you don't need to install rail on two sides, which saves money on infrastructure. Compared to bridge cranes, they can be used further away from factories, which makes them more flexible. The crane moves along the rails, while the trolley moves across the main beam horizontally. When used with the hoisting mechanism, it can lift, lower and move loads horizontally, allowing for precise multi-dimensional lifting. The lifting capacities of these cranes typically range from 5 to 500 tons, and they are used in different types of industries, from general cargo handling to metallurgy and shipbuilding.

II. How to sort out double-girder semi-gantry cranes

The things that these cranes need to be able to do are different depending on how they are being used, so it is important to be able to sort them into different groups so that you can choose the right one. At the moment, most things on the market are put into three groups based on how they are made, what they are used for, and what kind of outrigger they have.

1. Classification by Structural Form: How to adapt to different site layouts

Box-type double-girder semi-gantry crane: It has a box-type main girder structure, which makes it strong and stiff, and it is also lightweight. This is the type that is used most often. It is suitable for most general applications, such as processing machinery, logistics warehousing and building materials. It offers mature models for lifting capacities ranging from 5 to 200 tons, which are the most cost-effective.

Truss-Type Double-Girder Semi-Gantry Crane: The main girder uses a truss structure, which makes it strong in the wind and helps to spread heat. It is perfect for big open spaces outside, like open-air cargo yards in ports and power plants. However, because it is heavier, it needs stronger supports, so it is mostly used for lifting heavier things (or when the bridge is wider).

2. By Application: This text is about specialised work conditions.

General-purpose double-girder semi-gantry crane: This is a basic model that is good for everyday lifting jobs. It is suitable for handling cartons, steel and equipment parts. It is usually rated A3-A5, it is easy to use and cheap to maintain, which is why it is the preferred choice for small and medium-sized enterprises.

Cranes that are used in metallurgy and have two girders and a semi-gantry design. Made to be used in places where there are metals and high temperatures, dust, and impacts. It uses heat-resistant materials, thermal insulation, and impact-resistant hoisting mechanisms. It is perfect for tasks like ladle handling and moving billets. The working class is no lower than A6. Some models have dual protection against tipping and over-hoisting.

Explosion-Proof Double-Girder Semi-Gantry Crane: It is safe to use in places where there might be fire or explosion risks, like in chemical, pharmaceutical, and oil and gas factories. All of the electrical parts are designed in a way that prevents explosion. This is done by sealing the cables and connectors to stop sparks being created. Explosion-proof ratings such as ExdⅡBT4 and ExdⅢCT6 are used to classify these. You need to choose the right one based on the specific flammable/explosive media.

A container double-girder semi-gantry crane is a type of crane that can lift and move containers. Designed especially for working with containers, and has special container spreaders. They can lift more than 40 tons. It can move quickly and accurately, making it perfect for busy ports and container yards. Some models can connect to smart control systems, allowing them to be operated automatically.

3. Classification by Outrigger Type: Making it fit in small spaces

L-Leg Double-Girder Semi-Gantry Crane: It has L-shaped supports that make it small and don't take up much space on the ground. It is perfect for narrow areas where you need to connect factory buildings to cargo yards. It also gives you a clear workspace under the main girder. This is often used to lift equipment in places where machines are made.

C-Leg Double-Girder Semi-Gantry Crane: It has C-shaped legs with wide side openings, which let you get in and out of the work area from the side. It's perfect for lifting big components or long, rectangular cargo (like steel beams or pipes), and it won't get in the way when you're handling cargo. It is mainly used in shipbuilding and steel structure workshops.
As a top global supplier of cranes, Henan Mine Crane has a wide range of products from 5 to 500 tons. We'll provide custom designs based on site drawings, load characteristics and environmental parameters. Our full lifecycle services offer all-in-one solutions, from site surveys and design planning to installation and commissioning, plus regular maintenance.
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