Abstract: The present invention provides a cable installation method and a coupling unit, the cable installation method enabling the installation of a cable with an improved workability. From a messenger wire 11 installed between poles 10a and 10b, a spiral hangar unit 121 or the like is suspended in the vicinity of first pole 10a, the leading end of the spiral hangar unit 121 and the leading end of the lead wire 13 is connected to each other with a coupling unit 14 interposed therebetween an operation of connecting another spiral hangar unit 122 to a tail end of the spiral hangar unit 121 while feeding the lead wire 13, is repeated, the spiral hangar unit 121 is fed to the vicinity of second pole 10b, then the spiral hangar 12 is fixed to the messenger wire 11, and thereafter a cable 16 is installed between the poles.

Abstract: A clamp includes a first member, a second member, and a fastener. The first member has a first connecting portion and a first supporting portion. The second member has a second connecting portion and a second supporting portion. The first connecting portion and the second connecting portion are twisted clockwise or counterclockwise such that a first clamping portion of the first connecting portion and a second clamping portion of the second connecting portion are tilted to the right or to the left with respect to a front-back direction when seen from above. A spiral hanger is mounted on a support wire by tightening the first member and the second member by the fastener in a state where a support wire is passed through between the first supporting portion and the second supporting portion and a spiral hanger is passed between the first clamping portion and the second clamping portion.

Abstract: A clamp includes a first member, a second member, and a fastener. The first member has a first connecting portion and a first supporting portion. The second member has a second connecting portion and a second supporting portion. The first connecting portion and the second connecting portion are twisted clockwise or counterclockwise such that a first clamping portion of the first connecting portion and a second clamping portion of the second connecting portion are tilted to the right or to the left with respect to a front-back direction when seen from above. A spiral hanger is mounted on a support wire by tightening the first member and the second member by the fastener in a state where a support wire is passed through between the first supporting portion and the second supporting portion and a spiral hanger is passed between the first clamping portion and the second clamping portion.

Abstract: The present invention provides a cable installation method and a coupling unit, the cable installation method enabling the installation of a cable with an improved workability. From a messenger wire 11 installed between poles 10a and 10b, a spiral hangar unit 121 or the like is suspended in the vicinity of first pole 10a, the leading end of the spiral hangar unit 121 and the leading end of the lead wire 13 is connected to each other with a coupling unit 14 interposed therebetween an operation of connecting another spiral hangar unit 122 to a tail end of the spiral hangar unit 121 while feeding the lead wire 13, is repeated, the spiral hangar unit 121 is fed to the vicinity of second pole 10b, then the spiral hangar 12 is fixed to the messenger wire 11, and thereafter a cable 16 is installed between the poles.

Abstract: A new cable installation tool for installing a new cable between two points where the existing support line is installed includes: a plurality of S-shaped guides; a connection rope that connects the plurality of S-shaped guides; and a towrope that is bound to the end of the connection rope.

Abstract: There is disclosed a method of installing spiral hangers for hanging a cable on a messenger wire installed between a pair of electric utility poles. One end of a spiral hanger is first movably attached to the messenger wire in the vicinity of one of the electric utility poles. The spiral hanger has an inner diameter greater than the sum of the outer diameter of the messenger wire and the outer diameter of the cable. Subsequently, the spiral hanger is transported toward the other of the electric utility poles, and the other end of the spiral hanger is joined to one end of a succeeding spiral hanger through use of a joint sleeve. Above-described operations are repeated, and the spiral hangers are fixed to the messenger wire through use of fixing devices when the first spiral hanger arrives at the other of the electric utility poles.

Abstract: There is disclosed a method of installing spiral hangers for hanging a cable on a messenger wire installed between a pair of electric utility poles. One end of a spiral hanger is first movably attached to the messenger wire in the vicinity of one of the electric utility poles. The spiral hanger has an inner diameter greater than the sum of the outer diameter of the messenger wire and the outer diameter of the cable. Subsequently, the spiral hanger is transported toward the other of the electric utility poles, and the other end of the spiral hanger is joined to one end of a succeeding spiral hanger through use of a joint sleeve. Above-described operations are repeated, and the spiral hangers are fixed to the messenger wire through use of fixing devices when the first spiral hanger arrives at the other of the electric utility poles.

Abstract: In a method of hanging a cable by using spiral hangers on a messenger wire installed between a pair of electric utility poles, one end of a spiral hanger and a leading end of a pull rope are connected to a leading pulley in the vicinity of one of the electric utility poles. A spiral hanger having an inner diameter greater than the sum of the outer diameter of the messenger wire and the outer diameter of the cable is transported toward the other of the electric utility poles while surrounding the messenger wire and the pull rope. The other end of the spiral hanger is connected to one end of a succeeding spiral hanger by using a joint sleeve, and this operation is repeated. When the leading pulley arrives at the other of the electric utility poles, the spiral hangers are fixed to the messenger wire using fixing devices. After that, the pull rope is pulled so as to pull the cable connected to the tail end of the pull rope through the spiral hangers.

Abstract: A PC strand is formed by twisting peripheral wires made of deformed PC steel wires around a core, and allowing rust inhibitive material of thermoplastic resin to permeate into voids defined among the core and peripheral wires by use of an extruder. Since at least one of the core and peripheral wires is made of a deformed PC steel wire having an uneven outer surface, the thermoplastic resin can smoothly permeate deep into the inside of the PC strand.