The Key Reconstruction Technology of the Changjiang Yihua Standingpile Wharf

According to the need of production and development, the coal unloading wharves of yihua harbor in the lower changjiang river need to be expanded and reconstructed. In the reconstruction, the main body can only be reinforced, not be dismounted, and the reconstruction project can not affect the unloading, so it is with great difficulty. The available plan of the reconstruction is researched and adopted. The inner force of crane girder and bridging beam is calculated by using the theory of elasticity support continuous beam. The piles are assigned with reason, the differential settlement between the new and the old building is nearly eliminated, and the bearing condition of the main structure is improved. So it is needless to carry through driving pile over water or subbottom reinforcing pile foundation under the cross frame of the former wharf . The key technology is boring a pile driving hole in added pile position on the wharf deck of the crane girder side, then to drive the precast piles through the hole on the deck of the wharf with the land vibrating pile driver. The strict restrict of driving piles on the water avoided, at the same time, the coal unloading is not affected. Pile driving on the wharf deck less difficult condition than that one on the water. The practice indicated that this methods is reliable. So it has great guidance meaning to the similar wharf reconstruction project, especially as some ones in which the bearing capacity of the piles can not meet the need under the cross bend frame.