WO2011037445A1 - Procédé pour extraire un câble d'une gaine - Google Patents

Procédé pour extraire un câble d'une gaine Download PDF

Info

Publication number
WO2011037445A1
WO2011037445A1 PCT/MY2009/000220 MY2009000220W WO2011037445A1 WO 2011037445 A1 WO2011037445 A1 WO 2011037445A1 MY 2009000220 W MY2009000220 W MY 2009000220W WO 2011037445 A1 WO2011037445 A1 WO 2011037445A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
cable sheath
cores
sheath
cable cores
Prior art date
Application number
PCT/MY2009/000220
Other languages
English (en)
Inventor
Boon Keat Chong
Choi Hee
Original Assignee
Inno-X Sdn Bhd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inno-X Sdn Bhd filed Critical Inno-X Sdn Bhd
Publication of WO2011037445A1 publication Critical patent/WO2011037445A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
    • H02G1/1275—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by applying heat
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
    • H02G1/1287—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by means of a solvent
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
    • H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
    • H02G1/1273—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by pushing backwards insulation

Definitions

  • the present invention relates to a method of extracting or replacing cable cores enclosed within a cable sheath.
  • the present invention discloses an effective way to extract old underground cables, without the need to conduct much earth work to unearth the cables either direct buried underground, installed in an underground cable ducting or installed in a utility ducting within a building, yet the disclosed method allow replacement of the old cables with new? one.
  • the earth is excavated at spaced intervals of 20 to 50 meters to expose the cable then at least one end of the exposed cable is severed to reveal the metal conductor which later is subjected to pulling force to be retrieved from the cable sheath. Since there is no lubrication supplied and the friction in between the cable sheath and the conductor is high resulting the resistance to the relative movement increases, the claimed method only able to recover conductor of length not exceed 50 meters.
  • the present invention aims to provide a method of extracting cable cores from cable sheath of a fully grease-filled cable, or semi grease-filled or non grease-filled which is particularly buried underground or installed in an underground ducting. Specifically, the grease or greasy material contained within the cable is liquefied to serve as lubricant that ease withdrawal of the cable cores away from the cable sheath. Further object of the present invention is to offer an effective yet inexpensive method to replace cable cores of. an underground cable with a new high speed data transmission cable such as cable made of fiber optic, while the existing cable cores are being withdrawn.
  • one of the embodiments of the present invention includes a method of extracting cable cores from an outer cable sheath that the cable cores are soaked within matrix of greasy material enclosed by an inner cable sheath followed by an intermediate cable sheath and the outer cable sheath comprising the steps of liquefying greasy material partially or completely contained within the inner cable sheath; and pulling at least fraction of the cable cores at one end from the inner cable sheath to remove the cable cores, wherein each of the cable cores enclosing a metal wire.
  • Further aspect of the disclosed method comprises the step of fixing a replacement cable at another end of the cable cores prior to the pulling step, wherein the replacement cable is threaded through the inner cable sheath when the cable cores are being pulled. Accordingly, the disclosed method may have to expose partial of the cable cores at one end prior to the pulling.
  • the greasy material is none other than the filling composition specified in fully-filled telecommunication cables which similar to a gel or jelly composition made of Microcrystalline wax, paraffin wax, bees wax, mineral oil, polyethylene or any others chemical elements as stated in their respective formula.
  • Another major embodiment involves a method of removing cable cores from an outer cable sheath that the cable cores are soaked within matrix of greasy material enclosed by an inner cable sheath followed by an intermediate cable sheath and the outer cable sheath comprising the steps of dissolving greasy material partially or completely contained within the inner cable sheath by injecting a solvent into the inner core; and pulling at least fraction of the cable cores at one end from the inner cable sheath to remove the cable cores, wherein each of the cable cores enclosing a metal wire.
  • a replacement cable is preferably fixed at another end of the cable cores prior to the pulling step, wherein the replacement cable is threaded through the inner cable sheath when the cable cores are being pulled.
  • the solvent is any one or combination of hexane, pentane, chloroform, benzene, xylene, diethyl ether, ethanol, methyl isobutyl ketone or polar or non polar solvent with proper amount of surfactant.
  • Another major aspect of the present invention includes a method of removing cable cores from an outer cable sheath that the cable cores enclosed by an inner cable sheath followed by an intermediate cable sheath and the outer cable sheath comprising the steps of injecting a flowable medium into the inner cable sheath to reduce friction in between the cable cores and the inner cable sheath as well as among the cable cores: and pulling at least fraction of the cable cores at one end from the inner cable sheath to remove the cable cores, wherein each of the cable cores enclosing a metal wire.
  • the disclosed method also further comprises the step of detecting availability of perforated area along the inner cable sheath, intermediate cable sheath and/or outer cable sheath to avoid leakage of the injected flowable medium.
  • Positive air pressure may be applied into the inner cable sheath at one end and the air pressure is measured at another end to ascertain presence perforated area.
  • the flowable medium is a lubricant made of palm oil & its by-products.
  • Figure 1 is a cross-sectional view of the cables with an outer cable sheath, an intermediate sheath, an inner sheath and a plurality of cable cores;
  • Figure 2 shows the basic equipment set up for carrying out one embodiment of the disclosed method.
  • the cable mentioned hereinafter preferably refers to conventional telecommunication cables as illustrated in figure 1.
  • the cables (100) mainly composed of an outer cable sheath (101) made of PVC or polyethylene, an intermediate sheath or screen (102) made of metal, inner sheath (103) which is oil soaked paper and cable cores (104) which are insulated copper or ferrous wires.
  • inner sheath (103) which is oil soaked paper
  • cable cores (104) which are insulated copper or ferrous wires.
  • grease or greasy material (105) normally covers the void among the cable cores (104) to prevent seepage of water into the cable cores (104) if the cable sheaths are broken.
  • the present invention includes a method of removing cable cores (104) from an outer cable sheath (101) that the cable cores (104) are soaked within matrix of greasy material (105) enclosed by an inner cable sheath (103) followed by an intermediate cable sheath (102) and the outer cable sheath (101) comprising the steps of liquefying greasy material (105) partially or completely contained within the inner cable sheath (103); and pulling at least fraction of the cable cores (104) at one end from the inner cable sheath (103) to remove the cable cores, wherein each of the cable cores (104) enclosing a metal wire.
  • the disclosed method may include a step of fixing a replacement cable (11 1) at another end of the cable cores (104) prior to the pulling step, wherein the replacement cable (111) is threaded through the inner cable sheath (103) when the cable cores (104) are being pulled.
  • the existing cable cores (104) within the cable sheath can be easily replaced without the need to conduct much strenuous earth work to recover the whole cable (100).
  • the greasy material (105) is melted to serve as a lubricant to reduce friction in between the cable cores (104) and the internal wall surface of the inner sheath (103).
  • the cable cores (104) can be easily withdrawn out from the cable sheath.
  • a mechanical clamp (113a) may be used to cor ect the cable cores (104) and the replacement cable (111) together at on end as illustrated in figure 2.
  • an electrical potential or current is applied onto the copper wires to generate heat energy through an electrical circuit (1 14) due to electricity resistance in the copper or ferrous wires.
  • the generate energy melts the surrounding greasy material (105).
  • the electric current ranges from 1A to 50A and may be varied subjected to the types and length of the cables.
  • the liquefying step involves introducing a draft of heated air or heated steam through a closed loop venting system (1 15) into the inner cable sheath (103) at one end to melt the greasy material.
  • the heated air or steam is introduced into the inner cable sheath (103) under pressure that the air draft or steam is preferably brought to a temperature between 50°C and 100°C or may be varied subject to the type of greasy material, in order to effectively melt the greasy material (105).
  • a temperature sensor (118) is located at another end to measure temperature of the released steam or heated air to ensure sufficient heat energy is provided. If the temperature of the heated air drops below a pre-determined level at the discharged end.
  • the heat energy supplied may not sufficient to melt the greasy material (105) to the extent which rendering a lubricating effect. Consequently, inputting heated air or steam with higher temperature may be needed or the length of the cables to be treated has to be reduced.
  • the heated air or steam is directed into the inner cable sheath (103). Apart from that, the heat air or steam also somehow expands the diameter of the cable sheath that the expansion further facilitate withdrawal of the cable cores (104).
  • the pulling step is performed by mounting a mechanical clamp (113b) onto one end of the cable cores (104) followed by driving the mechanical clamp (1 13b) to pull the cable cores (104) as shown in the equipment set up illustrated in figure 2.
  • partial of the cable cores may have to be exposed by ridding off cable sheaths at one end for mounting of the mechanical clamp (113b) prior to applying a tensile force onto the mechanical clamp (113b) at one end for the pulling.
  • the exposed area preferably in 5cm to 30cm in length.
  • a small fraction or bundle is pulled out initially to a length of few meter to loosen the cable cores (104) enough followed by pulling the entire cable cores (104) out from the cable sheaths.
  • the present invention includes also a method of removing cable cores (104) from an outer cable sheath (101) that the cable cores (104) are soaked within matrix of greasy material (105) enclosed by an inner cable sheath (103) followed by an intermediate cable sheath (102) and the outer cable sheath (101) comprising the steps of dissolving greasy material (105) partially or completely contained within the inner cable sheath (103) by injecting a solvent into the inner cable sheath (103); and pulling at least fraction of the cable cores (104) at one end from the inner cable sheath (103) to remove the cable cores (104), wherein each of the cable cores (104) enclosing a metal wire.
  • a suitable solvent is used to soften or dissolve the greasy material. It is important to be noted that the solvent is injected specifically into the inner cable sheath to partially or completely dissolve the greasy material into a liquid form thereto providing a lubricating effect.
  • a pumping device (1 19) may be used to continuously inject the solvent into the inner cable sheath (103). Without softening or dissolving the greasy material, the greasy material (105) in solid state render great friction within the cable sheath against to the tensile force applied. As setting forth, the length of the cable to be treated ma ⁇ ' have to be reduced or the cable cores will be broken off.
  • the solvent used is any one or combination of hexane, pentane, chloroform, benzene. x ⁇ dene, diethyl ether, ethanol, methyl isobutyl ketone or polar or non polar solvent with proper amount of surfactant.
  • the disclosed method of dissolving the greasy material may comprise additional step of fixing a replacement cable (1 1 1) at another end of the cable cores (104) prior to the pulling step, wherein the replacement cable (11 1) is threaded through the inner cable sheath (103) when the cable cores are being pulled, while the cable cores (104) are exposed partially at one end for attachment of the mechanical clamp (113b) prior to the pulling.
  • the pulling step is performed through mounting a mechanical clamp (113b) onto one end of the cable cores followed by driving the mechanical clamp to pull the cable cores.
  • the greasy material can be petroleum jelly, or other filling composition made of Microcrystalline wax, paraffin wax, bees wax, mineral oil, polyethylene or any others chemical elements as stated in their respective formula.
  • Another preferred embodiment of the present invention is a method of removing cable cores (104) from an outer cable sheath (101) that the cable cores (104) enclosed by an inner cable sheath (103) followed by an intermediate cable sheath (102) and the outer cable sheath (101) comprising the steps of injecting a flowable medium into the inner cable sheath (103) to reduce friction in between the cable cores (104) and the inner cable sheath (103) as well as among the cable cores (104); and pulling at least fraction of the cable cores (104) at one end from the inner cable sheath (103) to remove the cable cores (104), wherein each of the cable cores (104) enclosing a metal wire.
  • this embodiment is directed to cables free of greasy material (105) within the inner cable sheath.
  • a flowable medium or lubricant is pumped or injected into the inner cable sheath (103).
  • the flowable medium is lubricant made of palm oil or its by-product.
  • the present invention may further include a step of detecting availability of perforated area along the inner cable sheath (103), intermediate cable sheath (102) and/or outer cable sheath (101). Owing to the fact that high pressure is used to inject the flowable medium, it is very likely the flowable medium leaks out from the perforated area rather than other end of the treated cable.
  • the detecting steps can be performed by applying air pressure into the inner cable sheath (103) at one end and measuring the air pressure at another end to ascertain perforated area. For example, if the detected air pressure at another end falls below a pre-determined value, it is possible there are perforated area available on the cable sheath.
  • the pulling step is performed through mounting a mechanical clamp (1 13b) onto one end of the cable cores (104) followed by driving the mechanical clamp (113b) to pull the cable cores (104).
  • a mechanical clamp (1 13b) onto one end of the cable cores (104) followed by driving the mechanical clamp (113b) to pull the cable cores (104).
  • partial of the cable cores (104) is exposed at one end by ridding off the cable sheaths prior to the pulling for mounting of the mechanical clamp (1 13b).

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  • Electric Cable Installation (AREA)

Abstract

L'invention porte sur un procédé d'extraction d'âmes de câble (104) d'une gaine extérieure de câble (101) dans lequel les âmes (104) du câble sont imprégnées d'une matrice de matière grasse (105) enfermée dans une gaine intérieure du câble (103), suivie d'une gaine de câble intermédiaire (102) et de la gaine extérieure du câble (101). Ce procédé comprend les étapes de liquéfaction de la matière grasse (105), partielle ou totale, contenue dans la gaine intérieure (103) du câble ; ou dissolution de la matière grasse par injection d'un solvant dans la gaine intérieure (103) du câble ; et tirage d'au moins une fraction des âmes du câble (104) à une extrémité de la gaine intérieure (103) du câble pour retirer les âmes du câble (104), chacune des âmes de câble (104) comprenant un fil métallique. L'invention porte également sur un procédé pour retirer des âmes de câble (104) d'une gaine extérieure de câble (101) dans lequel les câbles sont exempts de matière grasse dans la gaine intérieure de câble (103). L'extraction comprend les étapes d'injection d'un milieu fluide dans la gaine intérieure du câble (103) afin de réduire le frottement entre les âmes de câble (104) et la gaine intérieure de câble (103) ainsi qu'entre les âmes de câble (104) ; et de traction d'au moins une fraction des âmes de câble (104) à une extrémité hors de la gaine intérieure de câble (103) pour retirer les âmes de câble (104).
PCT/MY2009/000220 2009-09-28 2009-12-30 Procédé pour extraire un câble d'une gaine WO2011037445A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI20094011 2009-09-28
MYPI20094011 2009-09-28

Publications (1)

Publication Number Publication Date
WO2011037445A1 true WO2011037445A1 (fr) 2011-03-31

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015052462A1 (fr) * 2013-10-08 2015-04-16 Deflux Holdings Limited Procédé et appareil pour retirer une âme de câble d'une gaine de câble
GB2522230A (en) * 2014-01-17 2015-07-22 Deflux Holdings Ltd Method and apparatus for removing a cable core from a cable sheath
NL2014849A (en) * 2015-05-22 2016-11-28 James Eagles Nigel Method for removing a Cable Core from a Cable Sheath.
WO2020226906A1 (fr) * 2019-05-09 2020-11-12 Wesco Distrubution, Inc. Création d'un conduit à partir d'un câble de cuivre
CN114153038A (zh) * 2021-11-08 2022-03-08 长飞光纤光缆股份有限公司 一种易敷设高密度光缆

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018058A (en) * 1975-01-17 1977-04-19 Heinrich Eichenseher Method of recovering non-ferrous metal conductors from a telecommunication cable laid in the earth
US4197628A (en) * 1978-11-30 1980-04-15 Conti Allen C Method for removing conductors from the sheathing of a cable
US4553877A (en) * 1980-07-14 1985-11-19 Einar Edvardsen Method of converting a cable in the ground into a closed guiding track for insertion of new conductors
US20040117964A1 (en) * 2001-02-20 2004-06-24 Alois Pichler Method for removing a cable core from a cable sheath
WO2009009816A1 (fr) * 2007-07-16 2009-01-22 Alois Pichler Milieu fluide et son utilisation pour aider à retirer l'âme d'un câble de sa gaine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018058A (en) * 1975-01-17 1977-04-19 Heinrich Eichenseher Method of recovering non-ferrous metal conductors from a telecommunication cable laid in the earth
US4197628A (en) * 1978-11-30 1980-04-15 Conti Allen C Method for removing conductors from the sheathing of a cable
US4553877A (en) * 1980-07-14 1985-11-19 Einar Edvardsen Method of converting a cable in the ground into a closed guiding track for insertion of new conductors
US20040117964A1 (en) * 2001-02-20 2004-06-24 Alois Pichler Method for removing a cable core from a cable sheath
WO2009009816A1 (fr) * 2007-07-16 2009-01-22 Alois Pichler Milieu fluide et son utilisation pour aider à retirer l'âme d'un câble de sa gaine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015052462A1 (fr) * 2013-10-08 2015-04-16 Deflux Holdings Limited Procédé et appareil pour retirer une âme de câble d'une gaine de câble
WO2015052222A1 (fr) * 2013-10-08 2015-04-16 Deflux Holdings Limited Procédé et appareil pour retirer un noyau de câble d'une gaine de câble
AU2014333838B2 (en) * 2013-10-08 2019-01-17 Deflux Holdings Limited Method and apparatus for removing a cable core from a cable sheath
US10205308B2 (en) 2013-10-08 2019-02-12 Deflux Holdings Limited Method for removing a cable core from a cable sheath
GB2522230A (en) * 2014-01-17 2015-07-22 Deflux Holdings Ltd Method and apparatus for removing a cable core from a cable sheath
US10658824B2 (en) 2014-01-17 2020-05-19 Deflux Holdings Limited Method and apparatus for removing a cable core from a cable sheath
NL2014849A (en) * 2015-05-22 2016-11-28 James Eagles Nigel Method for removing a Cable Core from a Cable Sheath.
WO2016190735A1 (fr) 2015-05-22 2016-12-01 Eagles Nigel James Procédé pour enlever une âme de câble d'une gaine de câble
WO2020226906A1 (fr) * 2019-05-09 2020-11-12 Wesco Distrubution, Inc. Création d'un conduit à partir d'un câble de cuivre
CN114153038A (zh) * 2021-11-08 2022-03-08 长飞光纤光缆股份有限公司 一种易敷设高密度光缆

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