Easy-beam bridge

Known crane beam, the structure of similar composition and general overhead cranes. Starting weight, span and working speed are small. Bridge girder or other beam by beam and plate steel consisting of a simple cross-section beams, hand pull hoist or hoist trolley accompanied by simple as lifting trolley, trolley generally joist bottom flange on the run. Bridge along the elevated  Electric pallet jack running along the suspension can also be elevated following in orbit, this is called the crane girder suspension cranes.
Specialized metallurgical bridge