Hien Electric Industries, Ltd.

Sumitomo Electric Industries, Limited

Times Engineering, Ltd.

Times Eng., Ltd.

Kazuyoshi Chikiri

Yukihiro Higashi

Kazuhisa Matsuo

Toru Yamamoto

Masato Yamada

Yoshiyuki Matsubara

Masashi Oikawa

Shinji Nakaue

Hiroshi Muguruma

Michio Imai

Naoki Sogabe

Kazumasa Okubo

Toshiyuki Kobayashi

Makoto Morishita

Yukikiro Higashi

Shinichi Yamanobe

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 wireinstalled between polesand, a spiral hangar unitor the like is suspended in the vicinity of first pole, the leading end of the spiral hangar unitand the leading end of the lead wireis connected to each other with a coupling unitinterposed therebetween an operation of connecting another spiral hangar unitto a tail end of the spiral hangar unitwhile feeding the lead wire, is repeated, the spiral hangar unitis fed to the vicinity of second pole, then the spiral hangaris fixed to the messenger wire, and thereafter a cableis installed between the poles.

Cable installation method and coupling unit

A coated PC steel stranded cable includes: a stranded cable in which a plurality of elemental wires each composed of steel are twisted together; an anti-corrosive coating having an outer circumferential portion that coats an outer circumference of the stranded cable; an outer coating that coats an outer circumference of the anti-corrosive coating; and an optical fiber provided at a position inwardly of an outer circumferential surface of the outer coating and corresponding to a strand groove in the stranded cable so as to follow expansion and contraction of the stranded cable.

Coated PC steel stranded cable

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.

Clamp

Spiral hanger with connectors for suspending aerial wires or cables

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. Subsequently, a cable is passed through the spiral hangers through use of a pull-rope threading implement, whereby the cable is installed by work performed only in the vicinity of the electric utility poles. Special implements are used in order to facilitate the installation of the spiral hangers.

Method and implement for installation of spiral hangers for a cable

Method for installation of spiral hangers for a cable

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. With this operation, the cable can be installed by work performed only in the vicinity of the electric utility poles.

Spiral hanger for a cable and method of installing a cable using the same

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.

PC strand coated with rust inhibitor and method for producing the same

A PC strand is coated with rust inhibitive material of thermoplastic resin so as to wholly close spaces left around a core and peripheral wires twisted around the core, thus preventing the core and wires from rusting. The strand coated with the rust inhibitive material can be produced without being untwisted by use of an extruding machine having an auxiliary pressure head connected to a cross head.

PC stand coated with rust inhibitor and method thereof

Growing community of inventors

Fukuchiyama, Japan

Kazuyoshi Chikiri