Abstract
A new lift-up method for prestressed concrete (PC) pavements has been developed as a rehabilitation method for adjusting the unevenness of pavements, when they have unacceptable settlement and differential settlement in particular. The procedure of the newly developed lift-up method is as follows. Installation fittings for jacks and reaction beds are provided only at the settled area of the pavements when lift-up work becomes necessary. Hydraulic jacks are attached to the installation fittings, the PC slabs are lifted up and finally, the gap created between the PC slabs and the base courses is grouted. The lift-up operation is conducted by automatic control of the jack stroke lengths.
It is confirmed from the results of the lift-up tests in test pavements that PC slabs can be lifted up rapidly, precisely and safely by using this newly developed lift-up method.
