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1. 发明专利

JPH09304354A METHOD FOR DETECTING DISCONNECTION OF CABLE ELEMENT WIRE 失效
公开(公告)号：JPH09304354A
公开(公告)日：1997-11-28
申请号：JP12428096
申请日：1996-05-20
申请人： NIPPON STEEL CORP
发明人： SEISHIYOU MORIO , EGUCHI TATSUYA , TAKAMI SHINICHI , OKADA HIROYUKI , ISHIDA TSUGIO , UDAGAWA TATSUSHI
IPC分类号： G01N29/04 , G01H5/00 , G01N29/00 , G01N29/18
摘要： PROBLEM TO BE SOLVED: To detect disconnection of the element wires of a parallel-wire cable that is a hanging member of a bridge, such as a cable stayed bridge or a suspension bridge, or of a construction. SOLUTION: Part of a cover 5 at a position that is 5m or so away from the end 3 of cable is peeled, an ultrasonic probe 7 is contacted with the side of an element wire 2 for examination, and ultrasonic pulses of a predetermined frequency are input to the element wire 2 by an ultrasonic flaw detector 8. The input ultrasonic pulses propagate within the element wire 2 toward a socket 3 and, if the element wire 2 is ruptured, are reflected at the rupturing point; if the element wire 2 is not ruptured, they are reflected at an element wire terminal point 3 inside the socket. The reflected pulses are detected by the ultrasonic probe 7 and converted into voltage signals by the ultrasonic flaw detector 8, and a display device 9 is used to determine whether or not there is a rupture and displays the rupturing position. If there are no reflected waves, the element wire 2 is judged to be ruptured diagonally.

2. 发明专利

JPH08109605A CABLE FOR SUSPENSION STRUCTURE 失效
公开(公告)号：JPH08109605A
公开(公告)日：1996-04-30
申请号：JP24747494
申请日：1994-10-13
申请人： NIPPON STEEL CORP , HITACHI CABLE
发明人： TAKAMI SHINICHI , OSOZAWA KYOJI
IPC分类号： E01C11/00 , D07B1/16
摘要： PURPOSE: To secure the neat appearances neat and improve the workability in erection by a method wherein the outer diameter of a cable is made uniform by making the thickness of corrosion preventive sheathings covering strands different from one another when the strands for bearing mechanical strength for suspension are different from one another in the outer diameter. CONSTITUTION: The thickness for each of the corrosion preventive sheathings 6A-6C is determined in accordance with the maximum outer diameter of a strand 4a constructed of a plurality of wires 4, and the sheathing is made by extruding resin material to surround the strand 4a. The resin material to be used in extrusion of the sheathing must be of polyethylene or fluorocarbon resin, and the sheathing must be made in the outer diameter the same as a cable made by covering the strand 4a with the corrosion preventive sheathings 6A-6C. Parting agent 7, selected out of those higher in melting point than the resin material forming the corrosion preventive sheathings, is applied to parts between the corrosion preventive sheathings 6A and 6B, and 6B and 6C for preventing heat sealing from occurring to each of the sheathings. Thereby, the outer diameter of the cable can be made uniform, improving the appearances of the cable after erection while improving the workability in erection by virtue of simplification of erection clamps, vibration control clamps, vibration control dampers, etc.

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