Semi gantry crane is a variant of regular gantry crane with one end supported on a leg running on the ground rail and the other end travelling overhead on wall mounted track, therefore also called Single Leg Gantry Cranes. The single leg semi gantry cranes offers a cost-effective solution for factory or applications with narrow, confined spaces or crowded machinery.
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Structure :
- Hybrid Support : Unlike a full gantry crane that has legs on both sides, a semi-gantry crane has one side supported by a traditional, floor-mounted rail system (similar to a gantry crane). The other side of the crane's bridge is supported by an elevated runway system, which is typically attached to a building's wall or support structure (similar to an overhead bridge crane).
- Bridge Girder : It has a horizontal beam, known as the bridge girder, that spans the working area. This girder carries the trolley and hoist mechanism responsible for lifting and moving loads.
- End Carriages : The ends of the bridge girder are supported by end carriages. On the floor-mounted side, the end carriage has wheels to travel along the rail. On the elevated runway side, the end carriage has wheels that run along the fixed runway beam.
Features and Advantages :
- Cost-Effective : Generally, semi-gantry cranes can be more cost-effective than full gantry cranes because they require less supporting steel structure and only one floor rail.
- Versatility : They can be used both indoors and outdoors. Their design makes them suitable for various applications, especially along the walls of long buildings or in areas where integrating with existing overhead structures is beneficial.
- Adaptability : They can be installed below existing overhead bridge cranes to provide localized lifting capabilities without interfering with the operations of the upper crane.
- Reduced Building Load : By utilizing the building's support structure on one side, the load transferred to the floor is less compared to a full gantry crane.
Types :
- Single Girder Semi-Gantry Crane : Uses a single bridge beam and is suitable for lighter to medium loads.
- Double Girder Semi-Gantry Crane : Employs two parallel bridge beams, offering greater stability and higher lifting capacities for heavier loads.
Applications:
Semi-gantry cranes are widely used in various industries, including :- Manufacturing plants for assembly lines and material handling.
- Warehouses and logistics centers for loading and unloading goods.
- Construction sites for moving materials and equipment along the periphery.
- Maintenance and repair workshops.
- Steel storage yards.
- Precast yards.
- Shipbuilding.
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