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Crane SystemGantry Crane
A family of bridge cranes that stand on their own legs and work outdoors without needing the steel structure of a building.
What it is and how it works
A gantry crane is the legged version of the overhead crane. The bridge is carried on two legs that rest on the ground rather than the building, and the legs travel on a rail line laid on the ground. This allows it to work outdoors, in areas that are not roofed.
It is manufactured as full gantry (both legs on the ground) and semi-gantry (one side rests on the building's bracket). In cantilever types the bridge extends beyond the legs; this makes it possible to reach the truck loading lane from outside the rail line.
Since it works outdoors, wind load calculation, a rail clamp (storm anchor), a rain-protected panel and motor selection are part of standard manufacturing.
Technical specifications
| Feature | Value |
|---|---|
| Type | Full gantry / Semi-gantry / Cantilever |
| Lifting capacity | Determined by the project |
| Working environment | Open yard, stockyard, quarry site |
| Rail line | Ground-laid rail — requires a concrete beam and soil investigation |
| Wind safety | Storm anchor and anemometer option |
| Protection class | Raised IP protection for outdoor use |
| Control | Radio remote control (standard outdoors) |
Values are typical ranges; exact values become clear during engineering, based on facility dimensions and duty class.
Where it's used
- Marble and natural stone stockyards
- Iron-steel profile stockyards
- Precast concrete production yards
- Scrap and recycling facilities
- Shipyard and port back yards
Technical terms
| Term | What it means |
|---|---|
| Full gantry | A gantry crane where both legs rest on the ground rail line. |
| Semi-gantry | A type where one side rests on the ground and the other on a building bracket rail. |
| Cantilever | The part of the bridge that extends beyond the legs. |
| Storm anchor | A mechanism that fixes the crane to the rail when out of service, preventing it from drifting in wind. |
| Anemometer | A device that measures wind speed and warns the operator when the limit is exceeded. |
| Rail beam | The reinforced concrete beam poured under the rail line that spreads the wheel load to the ground. |
Frequently asked questions
What should the ground be like?
A reinforced concrete beam is poured under the rail line and it is verified that the ground can carry the leg wheel loads. A rail line dimension given without a soil investigation causes settlement and rail misalignment later.
Can it operate in wind?
It operates up to a certain wind speed; an anemometer that warns the operator when the limit is exceeded can be fitted. When out of service the crane is fixed to the rail with the storm anchor.
When does a semi-gantry make sense?
If there is already a suitable building bracket on one side of the yard, it is used instead of a second leg. It both saves space on site and lowers the cost.