Bridge crane girder

On the main beam camber arch girder bridge crane concept refers to the bridge at both ends of the beam on a plane as a reference , the main beam relative to the plane of the beam end bent upward plane. Max crane girder span bent upward at the center of the main beam , the maximum value on the center of the arch is called the camber of the main beam . Camber on the direction of the main beam length of each part of the camber of the track known as the main beam of the curve, or simply camber line. The sino hoist size and shape of the camber curve crane main beam camber on the manufacture and use of cranes are two important technical conditions . Carrying trolley bridge crane in the main beam is running, if the main beam inelastic deformation , the car is always on a straight track running, which is the best , but in fact this is not possible , because the main beam is an elastomer. If the crane made ​​of the level of the main beam , the crane when under load , the position of the main beam load is bound to produce a downward bent , that hoist gantry crane under the so-called main beam deflection . This time as the car runs across the end of the cross , the car itself will likely slip , running instability phenomenon ; And when the car runs across the end of the span to occur when climbing phenomenon , the running resistance of the car increases easy burning motor . On the other hand , if there is a large main beam under torsion , also worsen driving conditions carts run institutions.