Double Girder Semi-Gantry Crane

The Double Girder Semi-Gantry Crane is composed of two parallel main girders supported on one side by a pair of legs, which are connected at their base to a travelling end carriage, while the opposite ends of the girders are mounted directly onto a second end carriage running on an elevated runway. This hybrid configuration allows one side of the crane to operate as a traditional overhead bridge while the other side functions as a gantry leg system.

The hoisting and traversing mechanism—typically a trolley-mounted hoist—operates along the two main girders, providing precise vertical lifting and lateral movement.

Multiple hoisting devices may be installed on the same semi-gantry crane when required. These additional units can operate synchronously with the primary hoist for coordinated lifting operations or function independently as auxiliary systems to enhance operational flexibility and efficiency.

Single Girder Semi-Gantry Crane

The Single Girder Semi-Gantry Crane consists of a single main beam supported on one side by a gantry leg assembly, which is connected at its base to a travelling end carriage (translation head). The opposite end of the main beam is mounted directly onto a second end carriage operating along an elevated runway. This configuration allows one side of the crane to function as a gantry while the other side operates like a conventional overhead bridge.

The hoisting and traversing mechanism—typically a trolley-mounted hoist—operates beneath the main beam, enabling controlled vertical lifting and lateral movement along the girder.

Multiple hoisting devices may be incorporated into the same semi-gantry crane when required. These additional units can operate simultaneously with the primary hoist for coordinated lifting operations or perform auxiliary functions to increase operational flexibility and efficiency.