By making use of combat readiness boat & bridge equipment in the construction of Tianjin rainbow bridge, the construction technique, the key points ,main performance of equipment ,quality control of large scale steel stake cofferdan quality are introducd.

The paper describes the researches on the technologies for driving of large assembled steel sheet piles in Caofeidian Coal Terminal,selection of the final driving method and implementation of the selected method.

The quenching and tempering for large steel plate is a intractable problem as the large quenching distortion and difficult to control.

Application of large-scale steel form in transition section of straight torsional slope;