(1) With the truck crane, assemble and check the main girder beam, supporting legs and gearboxes by tag on the ground. Put them proper places waiting to lift.ship-building gantry crane

  (2) Assemble the gearboxes on the gantry crane rails, make them immovable through pulling the diagonal. Ensure the either side of the supporting legs and gearbox firmly conjunction with the pins connection. Then fix the tighten steel rope and chain hoists on the ground anchor. Assemble the reverse side in the same way. To guarantee the mounting dimensions of the main girder, the rigid and flexible supporting legs must be perpendicular to the ground. 

  (3) To hoist the both ends of the either side of the main girder with two truck cranes and put them on the rigid and flexible supporting legs. Bolt the connecting plates mounted under the girder and on the upper surface of the joists. Conduct the reverse main girder in the same ways. Special Attention: Don’t loose hook and unload before the main girder positive anchoring.