BOX GIRDER STRUCTURE OF BRIDGE HAVING EXTERNAL CABLE, AND BUILDING METHOD OF BOX GIRDER

摘要

PROBLEM TO BE SOLVED: To provide a method for extremely easily and surely checking the grout filling condition in a sheath in an outer cable of a box girder bridge when the prestress is newly introduced in a field where the grout filling condition is difficult to confirm, and checking a gap generating condition in a cable under service, and for easily discovering damages such as local breakage of various kinds of tendons. ;SOLUTION: An outer cable arranged on a box girder in the longitudinal; direction of a box girder bridge to introduce the prestress is provided with a transparent sheath 7 formed of transparent polyethylene resin, vinyl chloride rein, polypropylene resin, etc., and the press-fit condition of the grout in the sheath 7 can be surely and easily checked. When the colored grout 9 is filled, the filling condition can be more surely and easily checked. A partially unfilled part left after the curing can be easily found andthe repair filling can be facilitated.;COPYRIGHT: (C)2001,JPO