DIAGONAL CABLE REMOVAL METHOD

PROBLEM TO BE SOLVED: To replace a diagonal cable damaged due to some factors after the construction of a bridge in saddle structure for the bridge of single pipe structure. SOLUTION: A plurality of PC steel members 20 constituting a "diagonal cable" to be replaced are cut outside both ends of a saddle steel pipe 10 (a diagonal cable cutting process). Outlet part spacers 33 or the like disposed at both ends (straight pipe shaped steel pipes 12) of the saddle steel pipe 10 are removed (a cut-off structure part removal process). Grout 30 locked in contact with the tapered inner peripheral surface of the straight pipe shaped steel pipe 12 is bored to form an elongate hole H (a grout boring process). A state of hardly obtaining a locking effect of the grout 30 by the tapered shape of the straight pipe shaped steel pipe 12 can be acquired by the grout boring process. One or both ends of the plurality of PC steel members 20 constituting the "diagonal cable" to be replaced are strained one by one by a straining jack or the like (a diagonal cable straining process). COPYRIGHT: (C)2008,JPO&INPIT