[go: up one dir, main page]

FR2605083A1 - Device for the temporary repair of pipelines - Google Patents

Device for the temporary repair of pipelines Download PDF

Info

Publication number
FR2605083A1
FR2605083A1 FR8614350A FR8614350A FR2605083A1 FR 2605083 A1 FR2605083 A1 FR 2605083A1 FR 8614350 A FR8614350 A FR 8614350A FR 8614350 A FR8614350 A FR 8614350A FR 2605083 A1 FR2605083 A1 FR 2605083A1
Authority
FR
France
Prior art keywords
enclosure
pipe
crowns
seal
handling
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.)
Granted
Application number
FR8614350A
Other languages
French (fr)
Other versions
FR2605083B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CLEMENT RAYMOND
Original Assignee
CLEMENT RAYMOND
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 CLEMENT RAYMOND filed Critical CLEMENT RAYMOND
Priority to FR8614350A priority Critical patent/FR2605083B1/en
Publication of FR2605083A1 publication Critical patent/FR2605083A1/en
Application granted granted Critical
Publication of FR2605083B1 publication Critical patent/FR2605083B1/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/26Repairing or joining pipes on or under water
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63CLAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/34Diving chambers with mechanical link, e.g. cable, to a base
    • B63C11/36Diving chambers with mechanical link, e.g. cable, to a base of closed type
    • B63C11/40Diving chambers with mechanical link, e.g. cable, to a base of closed type adapted to specific work
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/168Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
    • F16L55/17Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/168Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
    • F16L55/175Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by using materials which fill a space around the pipe before hardening

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

The invention relates to a sealing method and device capable of totally isolating damage to a subsea pipe, the pipe being twisted or otherwise, and coated or not coated with concrete. This device is made up of an enclosure to be installed around the damage to the pipe, and of a handling appliance, which is fixed or entirely recoverable, and which can be operated by divers or from the surface without subsea human intervention.

Description

DESCRIPTION
La présente invention concerne un
DISPOSITIF DE REPARATION PROVISOIRE DES CANALISATIONS
Ce dispositif permet l'intervention immédiate sur des pipes sous-marins accidentés et tordus ; ces pipes initialement revêtus de béton ou non
Ce dispositif permet d'arrêter la pollution provoquée par un pipe sousmarin accidenté et de rincer totalement le pipe sans pollution du milieu
Ce dispositif permet aussi une poursuite d'exploitation du pipe en attendant une réparation qui nécessitera des moyens plus importants
Le dispositif comprend
10/ Une ENCEINTE - (E) Fig.1 - Fig.2
- capable de circonscrire le dommage du pipe
- s ouvrant sur les 2/3 inférieurs pour pouvoir être posée sur le pipe
depuis la surface
- réalisant une étanchéité élémentaire sur le pipe par deux couples
de couronnes caoutchoutées (J)
- le volume étanche ménagé entre chaque couple de couronnes caoutchou
tées (J) sera injecté de résine époxy (R) pour constituer l'étan
chéité définitive de l'enceinte (E) sur la canalisation (C)
20/ Un APPAREILLAGE DE MANUTENTION (AM)
Cet appareillage pouvant être, ou non, solidaire de l'enceinte
A moyennes profondeurs, cet appareillage sera opéré par scaphandriers, mécaniquement ou hydrauliquement
A grandes profondeurs, cet appareillage sera entièrement robotisé et commandera aussi la manoeuvre des tirants (T) de serrage des joints (J) ainsi que toutes les vannes solidaires de l'enceinte : vannes de purge de l'enceinte (VP) et vannes d'injection de résine (VI)
La Figure 1 de la Planche 1/5 montre une section longitudinale du dispositif dans son principe essentiel
L'enceinte (E) circonscrit un accident important de la canalisation (C).
DESCRIPTION
The present invention relates to a
PROVISIONAL REPAIR DEVICE FOR PIPES
This device allows immediate intervention on damaged and bent underwater pipes; these pipes initially coated with concrete or not
This device makes it possible to stop the pollution caused by a damaged submarine pipe and to completely rinse the pipe without pollution of the environment.
This device also allows continued operation of the pipe while awaiting repair which will require greater resources.
The device includes
10 / A SPEAKER - (E) Fig. 1 - Fig. 2
- able to limit the damage of the pipe
- opening on the lower 2/3 to be able to be placed on the pipe
from the surface
- making an elementary seal on the pipe by two couples
rubberized crowns (J)
- the sealed volume formed between each pair of rubber rings
tees (J) will be injected with epoxy resin (R) to form the etan
finality of the enclosure (E) on the pipeline (C)
20 / A HANDLING EQUIPMENT (AM)
This apparatus may or may not be integral with the enclosure
At medium depths, this equipment will be operated by divers, mechanically or hydraulically
At great depths, this equipment will be fully robotized and will also control the operation of the tie rods (T) for tightening the joints (J) as well as all the valves integral with the enclosure: purge valves of the enclosure (VP) and valves resin injection (VI)
Figure 1 of Plate 1/5 shows a longitudinal section of the device in its essential principle
The enclosure (E) circumscribes a major accident in the pipeline (C).

A chaque extrémité du dispositif un couple de couronnes caoutchoutées (J) sont pressées sur la canalisation pour obtenir une étanchéité élémentaire. At each end of the device a couple of rubberized rings (J) are pressed on the pipe to obtain an elementary seal.

Les couronnes (J) sont pressées sur les secteurs fixes de l'enceinte (SF) par des secteurs presseurs (SP) appliqués par les tirants (T) uniquement manoeuvrables à l'extérieur de l'enceinte
Que ce soit à moyennes ou grandes profondeurs d'installation, la manoeuvre des tirants (T) pourra être effectuée mécaniquement ou hydrauliquement par vérins creux
Le volume étanche ménagé entre chaque couple de couronnes (J) permettra de traiter, ou non, l'état de surface du pipe avant injection de résine époxy, ou de tout autre produit, pour réaliser l'étanchéité définitive de l'enceinte sur le pipe
La Figure 2 de la Planche 2/5 montre en perspective enceinte seule
En extrémité ne sont visibles : que le secteur presseur supérieur (SPS), que les secteurs presseurs latéraux (SPL) et les tirants de serrage (T) des couronnes (J)
Pour assurer une meilleure étanchéité longitudinale de l'enceinte les brides(B) des viroles pourront être boulonnées
Sur le corps de l'enceinte demeurent, après retrait de l'APPAREIL de manutention, les organeaux (OS) et (OL) de verrouillage de l'appareil
Ces organeaux pourront être très variables en forme, nombre et position en fonction du diamètre de l'enceinte à installer
Sont solidaires de la virole supérieure (VS) les vannes de purge de l'enceinte (VP) et les vannes d'injection de résine (VI) ; variables en nombre / diamètre et position
A chaque extrémité de la virole supérieure sont fixés des organes de guidage (G) par câbles guides
La Figure 3 de la Planche 3/5 montre une vue de face de l'enceinte maintenue ouverte par l'appareil de manutention (AM)
La solidarisation de l'enceinte à l'appareil de manutention est réalisée par des broches (BR)
La couronne caoutchoutée (J) est maintenue ouverte par les secteurs presseurs latéraux (SPL) solidaires des viroles latérales (VL)
La Figure 4 de la Planche 4/5 montre une coupe transversale axiale du dispositif
L'enceinte est constituée d'une virole supérieure (VS) et de deux viroles latérales (VL)
Chaque virole peut être équipée de brides longitudinales (B)
L'appareil de manoeuvre (AM) repose sur la virole supérieure et est verrouillé à celle-ci par les organeaux supérieurs (OS -Fig.5 et Fig.2)
L'appareil manoeuvre les viroles latérales (VL) auxquelles il est verrouillé par les organeaux latéraux (OL) et les broches (BR)
La manoeuvre de l'appareil pourra être directement effectuée mécaniquement par scaphandriers ou hydrauliquement par scaphandriers ou robotisation
La Figure 5 de la Planche 5/5 montre une vue en bout de l'enceinte seule et fermée
La virole supérieure (VS) est équipée, ou non, de brides (B) ; en son axe supérieur longitudinal sont fixés des organeaux de verrouillage (OS)
Les viroles latérales (VL) sont équipées, ou non, de brides (B) ; sur l'axe horizontal sont fixés des organeaux latéraux de verrouillage (OL)
La couronne caoutchoutée (J) est représentée excentrée dans l'une de ses positions orbitales, pressée par les secteurs presseurs (SPS) et (SPL) actionnés par les tirants (T) dont le nombre pourra varier en fonction du diamètre du pipe sur lequel l'enceinte doit être installée
The crowns (J) are pressed on the fixed sectors of the enclosure (SF) by pressing sectors (SP) applied by the tie rods (T) only maneuverable outside the enclosure
Whether at medium or large installation depths, the tie rods (T) can be operated mechanically or hydraulically by hollow cylinders
The sealed volume formed between each pair of crowns (J) will make it possible to treat, or not, the surface condition of the pipe before injection of epoxy resin, or any other product, to achieve the final seal of the enclosure on the smoking pipe
Figure 2 of Plate 2/5 shows a pregnant perspective only
At the end, only the upper presser sector (SPS), the lateral presser sectors (SPL) and the tightening rods (T) of the crowns (J) are visible.
To ensure better longitudinal tightness of the enclosure, the flanges (B) of the ferrules can be bolted
On the body of the enclosure, after removal of the handling APPARATUS, the locking elements (OS) and (OL) of the device
These elements can be very variable in shape, number and position depending on the diameter of the enclosure to be installed
The containment purge valves (VP) and the resin injection valves (VI) are integral with the upper shell (VS); variable in number / diameter and position
Guide members (G) are attached to each end of the upper shell by guide cables
Figure 3 of Plate 3/5 shows a front view of the enclosure kept open by the handling device (AM)
The enclosure is secured to the handling device by pins (BR)
The rubberized crown (J) is kept open by the lateral pressing sectors (SPL) integral with the lateral ferrules (VL)
Figure 4 of Plate 4/5 shows an axial cross section of the device
The enclosure consists of an upper ferrule (VS) and two lateral ferrules (VL)
Each ferrule can be fitted with longitudinal flanges (B)
The operating device (AM) rests on the upper shell and is locked to it by the upper elements (OS -Fig.5 and Fig.2)
The device operates the lateral ferrules (VL) to which it is locked by the lateral elements (OL) and the pins (BR)
The operation of the device can be directly carried out mechanically by divers or hydraulically by divers or robotization
Figure 5 of Plate 5/5 shows an end view of the single and closed enclosure
The upper shell (VS) is fitted, or not, with flanges (B); in its upper longitudinal axis are fixed locking members (OS)
The lateral ferrules (VL) are fitted, or not, with flanges (B); on the horizontal axis are fixed lateral locking members (OL)
The rubberized crown (J) is shown eccentric in one of its orbital positions, pressed by the pressing sectors (SPS) and (SPL) actuated by the tie rods (T) whose number may vary depending on the diameter of the pipe on which the enclosure must be installed

Claims (6)

REVENDICATIONS 1 / Dispositif pour intervenir sur des pipes accidentés ; tordus ou non ; bétonnés ou non ; caractérisé par une ENCEINTE capable de circonscrire le dommage et la pliure du pipe ; et par un APPAREILLAGE de manutention de 1'ENCEINTE qui pourra être solidaire de celle-ci ou entièrement indépendant 1 / Device for working on damaged pipes; twisted or not; concreted or not; characterized by a SPEAKER capable of limiting the damage and the bending of the pipe; and by an APPARATUS for handling the ENCLOSURE which may be integral with it or entirely independent 2 / Dispositif selon la revendication 1 caractérisé essentiellement en ce qu'une étanchéité élémentaire sera réalisée entre l'enceinte et le pipe par deux couples de couronnes caoutchoutées (J) 2 / Device according to claim 1 characterized essentially in that an elementary seal will be produced between the enclosure and the pipe by two pairs of rubberized crowns (J) 3 / Dispositif selon la revendication 1 caractérisé essentiellement en ce qu'une étanchéité définitive sera réalisée entre l'enceinte et le pipe par injection de résine dans le volume (R) rendu étanche par les couronnes (J)  3 / Device according to claim 1 characterized essentially in that a final seal will be achieved between the enclosure and the pipe by injection of resin into the volume (R) made waterproof by the crowns (J) 4 / Dispositif selon la revendication 2 caractérisé en ce que l'étan- chéité obtenue entre chaque couple de couronnes (J) permettra le traitement chimique de l'état de surface du pipe pour un meilleur accrochage de la résine d'étanchéité définitive 4 / Device according to claim 2 characterized in that the seal obtained between each pair of crowns (J) will allow the chemical treatment of the surface state of the pipe for better attachment of the final sealing resin 5 / Dispositif selon la revendication 2 caractérisé en ce que l'ouver- ture et la fermeture des couronnes (J) ainsi que leur étanchéité sur l'enceinte et les secteurs fixes (SF) en particulier sont obtenues par action extérieure sur les tirants (T) lesquels agissent sur des secteurs presseurs (SP) 5 / Device according to claim 2 characterized in that the opening and closing of the crowns (J) and their tightness on the enclosure and the fixed sectors (SF) in particular are obtained by external action on the tie rods ( T) which act on pressing sectors (SP) 6 / Dispositif selon la revendication 1 caractérisé en ce que les viroles de 11 enceinte pourront être équipées de brides longitudinales (B) lesquels brides pourront être boulonnées entre elles pour 6 / Apparatus according to claim 1 characterized in that the ferrules of 11 enclosure may be equipped with longitudinal flanges (B) which flanges can be bolted together to - assurer une meilleure tenue en pression de l'enceinte  - ensure better pressure resistance of the enclosure - libérer l'appareil de manutention (AM)  - release the handling device (AM)
FR8614350A 1986-10-14 1986-10-14 PROVISIONAL REPAIR DEVICE FOR PIPES Expired FR2605083B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8614350A FR2605083B1 (en) 1986-10-14 1986-10-14 PROVISIONAL REPAIR DEVICE FOR PIPES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8614350A FR2605083B1 (en) 1986-10-14 1986-10-14 PROVISIONAL REPAIR DEVICE FOR PIPES

Publications (2)

Publication Number Publication Date
FR2605083A1 true FR2605083A1 (en) 1988-04-15
FR2605083B1 FR2605083B1 (en) 1989-04-07

Family

ID=9339886

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8614350A Expired FR2605083B1 (en) 1986-10-14 1986-10-14 PROVISIONAL REPAIR DEVICE FOR PIPES

Country Status (1)

Country Link
FR (1) FR2605083B1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003069212A1 (en) * 2002-02-15 2003-08-21 Lattice Intellectual Property Ltd. Shell assemblies for encircling tubular members
GB2396678A (en) * 2002-12-23 2004-06-30 Taylor Kerr Apparatus for repairing an underwater pipe
GB2398350A (en) * 2001-12-27 2004-08-18 Lg Electronics Inc Hinge structure of flat visual display device
WO2008062045A1 (en) * 2006-11-24 2008-05-29 Renault S.A.S Protection shell for liquid pipe connectors
WO2011070376A1 (en) * 2009-12-11 2011-06-16 Subsea 7 Limited Pipeline hold back clamp
CN102900893A (en) * 2012-10-25 2013-01-30 中国海洋石油总公司 Plugging device and plugging method for annular space of submarine double-layer oil conveying pipe
CN103133817A (en) * 2013-02-07 2013-06-05 公安部上海消防研究所 Device and method for conducting online pipeline leakage stoppage
CN105711780A (en) * 2016-03-17 2016-06-29 天津超智海洋科技有限公司 Underwater robot watertight compartment structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1100766A (en) * 1965-08-11 1968-01-24 Structures & Pipework Ltd Pipe patch clamp assembly
US4535822A (en) * 1983-01-21 1985-08-20 The Pipe Line Development Company Fitting installation device
FR2562203A1 (en) * 1984-03-29 1985-10-04 Cochon Raymond Temporary anti-pollution repair device for subsea pipes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1100766A (en) * 1965-08-11 1968-01-24 Structures & Pipework Ltd Pipe patch clamp assembly
US4535822A (en) * 1983-01-21 1985-08-20 The Pipe Line Development Company Fitting installation device
FR2562203A1 (en) * 1984-03-29 1985-10-04 Cochon Raymond Temporary anti-pollution repair device for subsea pipes

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2398350B (en) * 2001-12-27 2005-11-02 Lg Electronics Inc Hinge structure of flat visual display device
GB2398350A (en) * 2001-12-27 2004-08-18 Lg Electronics Inc Hinge structure of flat visual display device
WO2003069212A1 (en) * 2002-02-15 2003-08-21 Lattice Intellectual Property Ltd. Shell assemblies for encircling tubular members
GB2398850A (en) * 2002-02-15 2004-09-01 Lattice Intellectual Property Shell assemblies for encircling tubular members
GB2396678B (en) * 2002-12-23 2006-08-23 Taylor Kerr Apparatus for repairing an underwater pipe
US6971413B2 (en) 2002-12-23 2005-12-06 Taylor Kerr ( Couplings) Limited Apparatus for repairing an underwater pipe
GB2396678A (en) * 2002-12-23 2004-06-30 Taylor Kerr Apparatus for repairing an underwater pipe
WO2008062045A1 (en) * 2006-11-24 2008-05-29 Renault S.A.S Protection shell for liquid pipe connectors
FR2909158A1 (en) * 2006-11-24 2008-05-30 Renault Sas PROTECTIVE SHELL FOR CONNECTIONS OF LIQUID PIPES.
WO2011070376A1 (en) * 2009-12-11 2011-06-16 Subsea 7 Limited Pipeline hold back clamp
CN102900893A (en) * 2012-10-25 2013-01-30 中国海洋石油总公司 Plugging device and plugging method for annular space of submarine double-layer oil conveying pipe
CN103133817A (en) * 2013-02-07 2013-06-05 公安部上海消防研究所 Device and method for conducting online pipeline leakage stoppage
CN103133817B (en) * 2013-02-07 2015-08-12 公安部上海消防研究所 A kind of online Pipe leakage stopper and blocking method
CN105711780A (en) * 2016-03-17 2016-06-29 天津超智海洋科技有限公司 Underwater robot watertight compartment structure

Also Published As

Publication number Publication date
FR2605083B1 (en) 1989-04-07

Similar Documents

Publication Publication Date Title
FR2605083A1 (en) Device for the temporary repair of pipelines
WO2022057261A1 (en) Device for in-situ repair of cable insulation layer in deep sea
NO318358B1 (en) Device for cable entry in a swelling gasket
FR2631731A1 (en) PROBE SUPPORT DRIVE ASSEMBLY FOR DETECTING DEFECTS IN TUBES, ESPECIALLY TUBES OF STEAM GENERATORS
EP0294252B1 (en) Equipment for a drill string with a side entry sub and method for its use
FR2568737A1 (en) UNDERWATER LINE FOR FIBER OPTIC TELECOMMUNICATIONS
US10777990B2 (en) Underwater cable repair habitat
EP0295995B1 (en) Cleaning procedure and device for the guide tube of a neutron flux measuring means in a pressurized-water cooled nuclear reactor
CN116979437A (en) Automatic repair device and repair method for insulating layer of underwater communication cable
CN110095332A (en) Three axis Hopkinson pressure bar experiment rock sample encapsulating methods of one kind and sealing device
FR2562203A1 (en) Temporary anti-pollution repair device for subsea pipes
FR2547660A1 (en) MULTIPLE JUNCTION FOR FIBER OPTICAL SUBMARINE CABLES
CH347147A (en) Process for establishing an underground gallery containing an armored pipe laid in a concrete coating, gallery obtained by the method and pipe for its implementation
CN119742692B (en) A docking auxiliary equipment for underground cable processing
RU2527926C2 (en) Erection of sealed chamber for pipeline repair
SU1116259A1 (en) Arrangement for repair work on pipelines laid on marshes
RU2282773C2 (en) Method and device for sealing detachable jacket of underwater pipeline
FR2617232A1 (en) SHUTTER FOR CONDUIT OR PASSAGE OF CABLE
CN219554563U (en) Power cable tube plugging device
CN118408107A (en) Sealing repair equipment for steel cylinder concrete pipe
JPS5893968A (en) Method of inspection equipment in pumping-up power plant and apparatus thereof
CN117168867A (en) Pressure maintaining sampling device
JP2002276286A (en) Propulsion pipe
FR2614932A1 (en) Equipment for drill strings comprising a connector with lateral slot
JPH03257287A (en) Underwater tunnel construction method and underwater excavation machine

Legal Events

Date Code Title Description
ST Notification of lapse