FR2560681A1 - Device for measuring mechanical stresses experienced by a telecommunications cable during its installation in an underground network - Google Patents

Device for measuring mechanical stresses experienced by a telecommunications cable during its installation in an underground network Download PDF

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Publication number
FR2560681A1
FR2560681A1 FR8403358A FR8403358A FR2560681A1 FR 2560681 A1 FR2560681 A1 FR 2560681A1 FR 8403358 A FR8403358 A FR 8403358A FR 8403358 A FR8403358 A FR 8403358A FR 2560681 A1 FR2560681 A1 FR 2560681A1
Authority
FR
France
Prior art keywords
cable
installation
mechanical stresses
telecommunications cable
underground network
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
FR8403358A
Other languages
French (fr)
Original Assignee
Laborderie Alain
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 Laborderie Alain filed Critical Laborderie Alain
Priority to FR8403358A priority Critical patent/FR2560681A1/en
Publication of FR2560681A1 publication Critical patent/FR2560681A1/en
Pending legal-status Critical Current

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
    • H02G1/06—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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/047—Specific indicating or recording arrangements, e.g. for remote indication, for indicating overload or underload
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/101—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using sensors inserted into the flexible member
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4463—Mechanical aspects of installing cables in ducts or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4463—Mechanical aspects of installing cables in ducts or the like
    • G02B6/4465—Pulling eyes

Abstract

The device measures the forces experienced at the end of a telecommunications cable without damaging it when it is being installed in an underground network. It consists of a dynamometer sensor transmitting signals through the pulling wire to the draw winch with an earth return circuit in order to measure the stress exerted and to control the draw winch or winches. Applications include the installation of optical fibre cables and the remote measurement of mechanical stresses.

Description

L'invention concerne un dispositif pour la mesure de contraintes me- caniques que subit un câble de télecommunication lors de son placesent dans un réseau souterrain. The invention relates to a device for measuring mechanical stresses which a telecommunication cable is subjected to when it is placed in an underground network.

Le dispositif de l'invention a pour but de détecter en continu et en tête du cible de télécomsunication les contraintes mécaniques de toutes natures, et de les transmettre un organe central de mesure et d'enregistrement, permettant de piloter et de réguler le système de traction du câble et, dans le cas de contraintes importantes, de supprimer la traction exercée sur celui-ci.The purpose of the device of the invention is to detect continuously and at the head of the telecomsunication target mechanical stresses of all kinds, and to transmit them to a central measurement and recording organ, making it possible to control and regulate the communication system. traction of the cable and, in the case of significant stresses, to suppress the traction exerted on the latter.

Le dispositif de l'invention est caractérisé en ce qu'il comprend les moyens de produire des signaux représentant la contrainte mécanique, de les transmettre, de les réceptionner et de les traiter.The device of the invention is characterized in that it comprises the means of producing signals representing the mechanical stress, of transmitting them, of receiving them and of processing them.

Le dispositif de l'invention comprendra
UNE PARTIE de détection de la contrainte par variation d'un signal électrique, image de la force de contrainte.The device of the invention will include
A PART of stress detection by variation of an electrical signal, image of the stress force.

Cette variation caractéristique de la contrainte sera transmise sous forme de signal électrique un récepteur placé distance (3 km par exemple) pres du treuil de tirage.This characteristic variation of the stress will be transmitted in the form of an electrical signal to a receiver placed at a distance (3 km for example) near the winch.

Ce récepteur traduira en clair les signaux transmis afin de pouvoir les exploiter facilement.This receiver will translate the transmitted signals in clear so that you can easily use them.

Le dispositif de l'invention est caractérisé en ce que la contrainte est mesurée par un capteur dynamométrique constitue par (1) le corps du capteur en métal de bonne tenue mécanique, d'un ressort (4) prenant appui sur le coprs (1) ; le ressort est maintenu par un axe de métal possédant un arrêtoir de compression du ressort. Cet axe est fixé la tête (2) portant un anneau de tirage ; il comporte également un noyau plongeur (6) se déplaçant dans une bobine (7).The device of the invention is characterized in that the stress is measured by a dynamometric sensor constituted by (1) the body of the metal sensor of good mechanical strength, of a spring (4) bearing on the body (1) ; the spring is held by a metal pin having a spring compression stop. This axis is fixed the head (2) carrying a pulling ring; it also includes a plunger core (6) moving in a coil (7).

Cette bobine (7) associée un condensateur (8), entre en oscillation entretenue par un circuit électronique (93. Cette oscillation électrique est amplifiée par un amplificateur de puissance (10). Cet ensemble autonome est alimenté par une batterie (11) rechargeable.This coil (7) associated with a capacitor (8), enters into oscillation maintained by an electronic circuit (93. This electrical oscillation is amplified by a power amplifier (10). This autonomous assembly is powered by a rechargeable battery (11).

Le signal apparaît entre la borne (3) isolée du corps (1) par un isolant (12) et le corps. La recharge de la batterie est assurée en courant continu par l'intermédiaire de la diode (13). The signal appears between the terminal (3) isolated from the body (1) by an insulator (12) and the body. The battery is recharged by direct current via the diode (13).

Le signal de fréquence émis par le capteur et représentant la contrainte, est dirigé d'une part sur la c^blette (14) (câble acier de traction) accroché en (2) par exemple, le point (3) étant relié a la gaine metal- lique de protection du câble de télétransmission (15) et d'autre part, par l'intermédiaire de la capacité résiduelle (16) formée par le touret (17) supportant le câble et la terre (18). The frequency signal emitted by the sensor and representing the stress, is directed on the one hand to the cable (14) (steel traction cable) hooked in (2) for example, the point (3) being connected to the metal sheath for protecting the remote transmission cable (15) and on the other hand, via the residual capacity (16) formed by the reel (17) supporting the cable and the earth (18).

Le signal est récupéré par un contact (20) sur la câblette du treuil de traction et une terre (21), placée aux environs immédiats du treuil. Ce signal est amplifie par le récepteur (22).The signal is recovered by a contact (20) on the cable of the traction winch and a ground (21), placed in the immediate vicinity of the winch. This signal is amplified by the receiver (22).

Le récepteur (22) amplifie le signal reçu par un circuit électronique (23) suivi d'un filtre de bande (24), de largeur approprié à ltexcursion de fréquence du signal de mesure.The receiver (22) amplifies the signal received by an electronic circuit (23) followed by a band filter (24), of width suitable for the frequency excursion of the measurement signal.

Un convertisseur frequence-tension (25) convertit le signal reçu de ma niere être lu directement sur un enregistreur (263 , un circuit comparateur (27) permet de piloter le moteur du treuil de tirage et de commander son arrêt lorsque la contrainte exercée sur le câble de télétrans- mission est plus grande que celle prévue pour le tirage. A frequency-to-voltage converter (25) converts the signal received so that it can be read directly on a recorder (263, a comparator circuit (27) makes it possible to control the motor of the pulling winch and to stop it when the stress exerted on the teletransmission cable is larger than that intended for the draw.

L'invention est représentée titre d'exemple non limitatif sur les dessins ci-joints dans lesquels : - la figure 1 représente le capteur dynamométrique, - la figure 2 la configuration d'un tirage de râble de télétransmission
travers un conduit (28), reliant deux chambres (29) distantes de plu
sieurs centaines de métres, - la figure 3 représente la récupération du signal fréquence par l'in-
termediaire de la câblette (14) et la terre (21).The invention is shown by way of nonlimiting example in the attached drawings in which: - Figure 1 represents the dynamometric sensor, - Figure 2 the configuration of a remote transmission cable draw
through a conduit (28), connecting two chambers (29) further apart
several hundred meters, - Figure 3 shows the recovery of the frequency signal by the
end of the cable (14) and the earth (21).

On notera que le dispositif peut fonctionner dans le cas ou le câble de télétransmission ne comporte aucune partie métallique (fibre optique par exemple), par l'adjonction d'un fil métallique tiré par le capteur (1), côté câble de télétransmission. La capacité résiduelle (16) entre ce fil métallique et la terre transmettra de la meme manière le signal. It will be noted that the device can operate in the case where the remote transmission cable does not comprise any metallic part (optical fiber for example), by the addition of a metallic wire drawn by the sensor (1), on the remote transmission cable side. The residual capacity (16) between this metal wire and the earth will transmit the signal in the same way.

Claims (3)

R E V E N D I C A T I O N S R E V E N D I C A T I O N S câble en toute sécurité. cable safely. cée sur la tête de câble de manière tirer dans un conduit ce cée on the cable head so pull in a conduit this en ce qu'il comprend les moyens de mesurer la contrainte exer in that it includes the means of measuring the stress exer I) Dispositif de tirage de câble de télécommunication caractérisé I) Device for drawing a telecommunications cable characterized 2) Dispositif conforme la revendication 1 caractérisé en ce qu'il2) Device according to claim 1 characterized in that it comporte les moyens nécessaires à L'émission d'un signal electri-  includes the means necessary for the emission of an electrical signal que (1 à 13) rayonnant transmis par l'intermediaire-du câble de that (1 to 13) radiating transmitted through the cable traction avec retour du signal par la terre (14 à 21).  traction with return of the signal by the ground (14 to 21). 3) Dispositif conforeme à la revendication l'caractérisé en ce qu'il comporte un3) Device according to claim the characterized in that it comprises a récepteur des signaux représentant la contrainte en tête du cible  receiver of signals representing the stress at the head of the target pouvant piloter le treuil de tirage afin d'assurer la mise en place able to control the pulling winch to ensure installation du câble dans le conduit sans que les efforts de tractions endom of cable in the conduit without the endom pulling efforts magent le câble.  take the cable.
FR8403358A 1984-03-05 1984-03-05 Device for measuring mechanical stresses experienced by a telecommunications cable during its installation in an underground network Pending FR2560681A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8403358A FR2560681A1 (en) 1984-03-05 1984-03-05 Device for measuring mechanical stresses experienced by a telecommunications cable during its installation in an underground network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8403358A FR2560681A1 (en) 1984-03-05 1984-03-05 Device for measuring mechanical stresses experienced by a telecommunications cable during its installation in an underground network

Publications (1)

Publication Number Publication Date
FR2560681A1 true FR2560681A1 (en) 1985-09-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
FR8403358A Pending FR2560681A1 (en) 1984-03-05 1984-03-05 Device for measuring mechanical stresses experienced by a telecommunications cable during its installation in an underground network

Country Status (1)

Country Link
FR (1) FR2560681A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3708748C1 (en) * 1987-03-18 1988-09-15 Peter Lancier Maschb Hafenhuet Device for measuring a tensile force using a tensile force transducer
EP0318745A2 (en) * 1987-11-30 1989-06-07 HEINS MASCHINENBAU GMBH & CO. KG Process and device for laying cables in conduits laid in advance
FR2661050A1 (en) * 1990-04-13 1991-10-18 Pollaud Gilles Device for installing underground cables

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2900770A1 (en) * 1979-01-10 1980-07-24 Felten & Guilleaume Carlswerk Continuous cable tensile force measuring appts. - has tensile force measuring head transducer to convert force into measuring electric signal, and signal converter
FR2505497A1 (en) * 1981-05-08 1982-11-12 Lignes Telegraph Telephon Direct measuring system for tractive force on cable - comprises cable drum mounted on chassis acting on force sensor providing servo control signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2900770A1 (en) * 1979-01-10 1980-07-24 Felten & Guilleaume Carlswerk Continuous cable tensile force measuring appts. - has tensile force measuring head transducer to convert force into measuring electric signal, and signal converter
FR2505497A1 (en) * 1981-05-08 1982-11-12 Lignes Telegraph Telephon Direct measuring system for tractive force on cable - comprises cable drum mounted on chassis acting on force sensor providing servo control signal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NTZ NACHRICHTENTECHNISCHE ZEITSCHRIFT, vol. 33, no. 12, décembre 1980, pages 788-793, Berlin, DE; K. GOTTWALD et al.: "Messung von Einzugskr{ften von Lichtwellenleiterkabeln" *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3708748C1 (en) * 1987-03-18 1988-09-15 Peter Lancier Maschb Hafenhuet Device for measuring a tensile force using a tensile force transducer
WO1988007184A1 (en) * 1987-03-18 1988-09-22 Peter Lancier Maschinenbau-Hafenhütte Gmbh & Co. K Device employing a tensile force meter for measuring tensile force
EP0318745A2 (en) * 1987-11-30 1989-06-07 HEINS MASCHINENBAU GMBH & CO. KG Process and device for laying cables in conduits laid in advance
EP0318745A3 (en) * 1987-11-30 1990-06-27 HEINS MASCHINENBAU GMBH & CO. KG Process and device for laying cables in conduits laid in advance
FR2661050A1 (en) * 1990-04-13 1991-10-18 Pollaud Gilles Device for installing underground cables

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