What type of crane design is supported by two sets of legs under the bridge beam?

The gantry crane is characterized by its support structure, which consists of two sets of legs, each supporting a bridge beam. This design allows the gantry crane to be used in various applications, notably in outdoor environments where it can move along tracks on the ground. The elevated bridge beam connects the two sets of legs and typically carries hoisting equipment. This structure provides stability and allows for the lifting and moving of heavy loads across a wide area.

In contrast, other crane designs such as monorails rely on a single beam, while tower cranes utilize a vertical design anchored to a base, and bridge cranes operate with support structures above the load, generally not featuring the same dual-leg configuration. Understanding these structural characteristics is essential for recognizing how each type of crane functions and is applied in specific situations.