EP0425339B1 - Hänge- und Behandlungsvorrichtung integriert in den Beinen einer selbsthebenden Offshore-Plattform - Google Patents
Hänge- und Behandlungsvorrichtung integriert in den Beinen einer selbsthebenden Offshore-Plattform Download PDFInfo
- Publication number
- EP0425339B1 EP0425339B1 EP90402876A EP90402876A EP0425339B1 EP 0425339 B1 EP0425339 B1 EP 0425339B1 EP 90402876 A EP90402876 A EP 90402876A EP 90402876 A EP90402876 A EP 90402876A EP 0425339 B1 EP0425339 B1 EP 0425339B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- reduction gear
- legs
- accordance
- gear unit
- 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.)
- Expired - Lifetime
Links
- 239000000725 suspension Substances 0.000 title claims description 12
- 230000003028 elevating effect Effects 0.000 title 1
- 230000007246 mechanism Effects 0.000 claims description 15
- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000000806 elastomer Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000002648 laminated material Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000012858 resilient material Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 description 13
- 230000000712 assembly Effects 0.000 description 12
- 238000000429 assembly Methods 0.000 description 12
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000035939 shock Effects 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- PZASAAIJIFDWSB-CKPDSHCKSA-N 8-[(1S)-1-[8-(trifluoromethyl)-7-[4-(trifluoromethyl)cyclohexyl]oxynaphthalen-2-yl]ethyl]-8-azabicyclo[3.2.1]octane-3-carboxylic acid Chemical compound FC(F)(F)C=1C2=CC([C@@H](N3C4CCC3CC(C4)C(O)=O)C)=CC=C2C=CC=1OC1CCC(C(F)(F)F)CC1 PZASAAIJIFDWSB-CKPDSHCKSA-N 0.000 description 1
- 238000012550 audit Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
- E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
- E02B17/024—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform shock absorbing means for the supporting construction
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
- E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions
Definitions
- the present invention relates to an integrated suspension and handling system for platform support legs for drilling or offshore oil production and relates more particularly to self-elevating platforms.
- Platforms of this type generally have legs resting on the seabed and a hull mounted movable and adjustable in height along the legs.
- the whole platform is brought into flotation to the drilling or operating site and the legs are lowered until contact with the seabed, then by resting on the legs, the hull is hoisted above from sea level, to an altitude that puts it beyond the reach of the highest waves.
- the hull is therefore movable along the legs of the platform by means of lifting mechanisms integral with said hull and comprising output pinions whose bearings are integral with the hull and cooperating with racks mounted on at least part of leg length.
- These pinions are motorized by a plurality of for example electric motors associated with reducers whose reduction ratio is very high.
- leg suspension device which is constituted by a rotating balancing arm.
- a device for suspending the legs of an oil platform which comprises at least one torsion bar, one end of which is provided with 'a pinion meshing with a toothed sector mounted on the reducer and the other end of which is immobilized on the structure integral with the shell of the platform.
- torsion bar or bars are arranged parallel to the axis of rotation of the drive mechanism which increases the overall size of the assembly.
- the invention therefore aims to remedy the aforementioned drawbacks by creating a system for suspending the legs of a self-elevating oil platform which, while being of a relatively simple construction, makes it possible to reduce the size of the drive mechanism and the stresses due to shocks in the structure and especially in the gears of the reducers, and to carry out the installation of the platform with severe sea conditions, therefore in larger weather windows, which reduces the cost of installation.
- an integrated suspension and handling system for the self-elevating oil platform support legs comprising a hull mounted displaceable on the legs by means of drive mechanisms comprising at least two opposite assemblies each formed by a motor associated with at least one reduction gear driving an output pinion cooperating with opposite racks mounted on at least part of the length of the legs, said opposite assemblies of each drive mechanism being mounted articulated on a structure supporting them via at least one bearing allowing a determined angular movement of said assemblies and of each corresponding output pinion, characterized in that said motor and said at least reduction gear of each opposite assembly are housed in an energy absorption member formed by at minus a torsion sleeve used in particular when laying the legs on the seabed, and limiting the stresses due to the bending of said legs under the action of swell and wind.
- a self-elevating oil platform comprising a hull 1 movable mounted on vertical legs 2 intended to bear on the seabed 3, when the platform is in the drilling or operating position.
- Each of the vertical legs 2 has, in the present case, a triangular section and it consists of three uprights 2a, connected together by a lattice of metal beams.
- leg 4 which, in the present example, is hexagonal in shape.
- the platform is also equipped, at each leg 2, with a drive and suspension mechanism 10 for the shell relative to said legs.
- This drive mechanism 10 makes it possible to lower the legs 2 to the contact with the seabed, then taking support on the legs, to hoist the hull 1 above the sea, to an altitude which puts it out of the reach of the highest waves.
- the uprights 2a of the legs 2 are provided with diametrically opposite racks 5 disposed on a part of the length of the legs 2 and with which are intended to cooperate the output pinions 11 of the drive mechanism 10 mounted on the shell 1
- the output pinions 11 of the drive mechanism 10 mounted on the shell 1
- four output pinions can be provided for each upright 2a and each equipped with a geared motor assembly 12.
- a drive and suspension mechanism 10 In these figures, there is shown in phantom the amount 2a of a leg 2 provided with two opposite racks 5.
- the drive mechanism 10 comprises four geared motor assemblies 12a, 12b, 12c and 12d superimposed two by two and contiguous two by two.
- This assembly 12a comprises a motor 13, for example an electric motor, first driving a first reducer 14 at high speed and small torque, which causes a second reducer 15 for example of the epicyclic type, but at a lower speed and greater torque, on the 'slowest output shaft 16 from which the pinion 11 is keyed.
- a motor 13 for example an electric motor
- first driving a first reducer 14 at high speed and small torque which causes a second reducer 15 for example of the epicyclic type, but at a lower speed and greater torque, on the 'slowest output shaft 16 from which the pinion 11 is keyed.
- the output shaft 16 is guided at its free end by a bearing 17 of a structure 20 integral with the shell.
- the reduction gear 15 is articulated on the structure 20 which supports the assembly 12a by means of bearings 18a and 18b so as to allow a certain angular movement of said assembly 12a and therefore of the corresponding output pinion 11, during the descent and the laying of the leg, as we will see later.
- the geared motor assembly 12a comprises an energy absorbing member formed by a tubular torsion sleeve 21 inside which the motor 13 and at least the reducer 14 are housed, thus making it possible to produce a compact assembly. and space-saving.
- the end 21a of the sleeve 21 is fixed, for example by gluing, on a flange 22 which is itself integral with the reduction gear 15.
- the end 21b of the sleeve 21 is fixed, for example by gluing, on a flange 23.
- the end 21b of the sleeve 21 is integral with a crosspiece 24 via the flange 23.
- This crosspiece 24 connects the sleeve 21 of the assembly 12a to the sleeve 21 of the adjoining assembly 12b, also by means of a flange 23 (Fig. 4), these two assemblies 12a and 12b being driven in the opposite direction because their respective pinion 11 meshes with the two opposite racks 5 located on either side of the upright 2a.
- the sleeves 21 are made of an elastically deformable material such as elastomers. They can also be made of a laminated material formed by a juxtaposition of washers made of elastomer and steel washers.
- tie rods 25 have one end secured to the structure 20 supporting the geared motor assemblies 12a, 12b, 12c and 12d and the other end secured to the crosspiece 25 connecting two contiguous sleeves.
- the entire platform is therefore brought into flotation to the drilling or operating site, and the legs 2 are lowered until they come into contact with the seabed.
- the motors 13 therefore drive, via the reducers 14 and 15, the output pinions 11 which mesh with the racks 5.
- the motors 13 act as brakes.
- each torsion sleeve 21 is composed of two sections, for example a small section 21c and a longer section 21d separated by an intermediate flange 30 on which these are fixed, for example by gluing.
- the flanges 30 corresponding to two contingent sleeves 21 are connected by two tie rods 31 and 32 adjustable in length and make it possible to immobilize said rotating flanges mutually.
- the torsion sleeves 21 can be used for two functions.
- the first function which consists in absorbing the shock of the pose of a leg 2 on the seabed, uses the entire length of the sleeves 21 and, in this case, the tie rods 31 and 32 are not mounted, so that the flanges 30 are free to rotate and the opposing torques are balanced by the crosspieces 24.
- the second function is used when the legs 2 are placed at the bottom and the hull raised above sea level.
- tie rods 31 and 32 are therefore installed between the intermediate flanges 30 of each motor-reducer assembly 12a, 12b, 12c and 12d.
- This system is advantageous from the point of view of the cost of the installation, because it makes it possible to eliminate the interposition of elastic cushions between the structure 20 supporting the geared motor assemblies and the shell 1 of the platform, as is usual. to do so in the prior art.
- the damping stroke is very large, because the number of torsional turns of the sleeves 21 is not limited.
- the device according to the invention also makes it possible to equalize the torques between all of the reducers of the system for moving the legs relative to the hull, and thus offers the possibility of laying the platform. with more severe sea conditions, therefore in wider weather windows, which significantly reduces installation costs.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Gear Transmission (AREA)
- Invalid Beds And Related Equipment (AREA)
- Jib Cranes (AREA)
- Details Of Aerials (AREA)
Claims (10)
- Hänge- und Behandlungsvorrichtung integriert in Stützbeinen (2) einer selbsthebenden Offshore-Plattform, die eine Schale (1) aufweist, die mittels eines Antriebsmechanismus (10) verstellbar auf den Beinen (2) montiert ist, der mindestens zwei entgegengesetzte Einheiten (12) aufweist, die jeweils aus einem Motor (13) bestehen, der mindestens einem Untersetzungsgetriebe (14, 15) zugeordnet ist, das ein Ausgangsritzel (11) mitnimmt, das mit entgegengesetzten auf mindestens einem Teil der Länge der Beine (2) montierten Zahnstangen (5) zusammenwirkt, wobei die entgegengesetzten Einheiten (12) jedes Antriebsmechanismus (10) verschwenkbar auf einer Struktur (20) montiert sind, die sie mittels mindestens eines Lagers (17, 18a, 18b) unterstützt, das eine bestimmte Winkelverschwenkung der Einheiten (12) und jedes der entsprechenden Ausgangsritzel (11) erlaubt,
dadurch gekennzeichnet, daß
der Motor (13) und das mindestens eine Untersetzungsgetriebe (14, 15) jeder entgegengesetzten Einheit (12) in einem Organ (21) zur Energieabsorption gelagert sind, das durch wenigstens eine Torsionshülse gebildet wird, die beim Hinstellen der Beine (2) auf dem Seeboden angewendet wird, und zur Einschränkung von Belastungen wegen des Biegens der Beine (2) unter Einfluß von Dühnung und Wind. - Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das eine der Enden (21a) der Torsionshülse durch die entsprechende Motor-Untersetzungsgetriebe-Einheit (12) mit rotiert wird und das andere der Enden (21b) der Torsionshülse (21) einstückig mit einem Querträger zwischen (24) verbunden ist, der zwei aneinander grenzende Torsionshülsen (21), die der entsprechenden Motor-Untersetzungsgetriebe-Einheit (12) zugeordnet sind, miteinander verbindet, wobei beide Motor-Untersetzungsgetriebe-Einheiten (12) bezüglich zueinander in entgegengesetztem Sinn drehen.
- Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Torsionshülse (21) jeder Motor-Untersetzungsgetriebe-Einheit (12) aus wenigstens zwei Endstücken (21c, 21d) besteht, die durch einen Zwischenbundring (30) getrennt sind, auf dem eines der Enden jedes Endstückes befestigt ist.
- Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Zwischenbundringe (30) der aneinandergrenzenden Motor-Untersetzungsgetriebe-Einheiten (12) durch wenigstens eine in der Länge verstellbare Spannstange (31, 32) verbunden sind, die gegenseitig die Rotation der Zwischenbundringe (30) festhält.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß jedes der Enden (21a, 21b) der Torsionshülse (21) jeder Motor-Untersetzungsgetriebe-Einheit (12) auf einem Bundring (22, 23) befestigt ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Torsionshülse (21) jeder Motor-Untersetzungsgetriebe-Einheit (12) durch Kleben auf den Bundringen (22, 23, 30) befestigt ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie eine Kompressionsvorspannungseinrichtung (25) für die Torsionshülse jeder Motor-Untersetzungsgetriebe-Einheit (12) aufweist.
- Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Kompressionvorspannungseinrichtung aus wenigstens einer an der Achse der Torsionshülsen (12) parallelen Spannstange (25) besteht, von der ein Ende einstückig mit der Struktur (20) verbunden ist, die die Motor-Untersetzungsgetriebe-Einheit (12) trägt und von der das andere Ende einstückig mit dem Querträger (24), der zwei aneinanderliegenden Torsionshülse (21) verbindet, verbunden ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Torsionshülse (21) jeder Motor-Untersetzungsgetriebe-Einheit (12) aus einem Elastromer- oder einem ähnlichen plastischen Material besteht.
- Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Torsionshülse (21) jeder Motor-Untersetzungsgetriebe-Einheit (12) aus einem lamellenartigen Material besteht, welche aus einer Juxtaposition von runden Scheiben aus Elastomer und runden Scheiben aus Stahl besteht.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8913934 | 1989-10-24 | ||
FR8913934A FR2653462B1 (fr) | 1989-10-24 | 1989-10-24 | Dispositif de suspension et de manutention integrees des jambes d'une plate-forme petroliere auto-elevatrice. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0425339A1 EP0425339A1 (de) | 1991-05-02 |
EP0425339B1 true EP0425339B1 (de) | 1992-10-14 |
Family
ID=9386730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90402876A Expired - Lifetime EP0425339B1 (de) | 1989-10-24 | 1990-10-15 | Hänge- und Behandlungsvorrichtung integriert in den Beinen einer selbsthebenden Offshore-Plattform |
Country Status (6)
Country | Link |
---|---|
US (1) | US5102264A (de) |
EP (1) | EP0425339B1 (de) |
JP (1) | JP2665394B2 (de) |
KR (1) | KR960005724B1 (de) |
FR (1) | FR2653462B1 (de) |
NO (1) | NO177194C (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2658215B1 (fr) * | 1990-02-13 | 1994-05-13 | Brissonneau Lotz Marine | Perfectionnement aux mecanismes de manóoeuvre de plateformes marines, procede de gestion de ces mecanismes et installation pour la mise en óoeuvre du procede. |
US5580189A (en) * | 1995-12-22 | 1996-12-03 | Searex, Inc. | Jack-up rig crane |
US5797703A (en) * | 1996-02-02 | 1998-08-25 | Searex, Inc. | Elevating unit for use with jack-up rig |
US5997217A (en) * | 1998-05-11 | 1999-12-07 | Verret; Rodney J. | Shallow water well-drilling apparatus |
US20100155682A1 (en) * | 2008-12-06 | 2010-06-24 | Burns Mark L | Fast jack liftboat jacking system |
KR101018741B1 (ko) * | 2010-12-30 | 2011-03-04 | 삼성물산 주식회사 | 해상 제티 구조물을 이용한 엘엔지 재기화 설비 |
KR101018742B1 (ko) * | 2010-12-30 | 2011-03-04 | 삼성물산 주식회사 | 해상 잭업 플랫폼을 이용한 엘엔지 재기화 설비 |
AT511611B1 (de) * | 2011-07-13 | 2013-01-15 | Univ Wien Tech | Anordnung von schwimmplattformen |
CN103696685B (zh) * | 2013-11-28 | 2015-10-21 | 江苏泰来减速机有限公司 | 一种同轴双减速正反双向输出螺旋入岩钻机 |
CN103696684B (zh) * | 2013-11-28 | 2015-10-21 | 江苏泰来减速机有限公司 | 一种双驱动同轴正反向增速输出螺旋入岩钻机 |
EP2915769A1 (de) * | 2014-03-04 | 2015-09-09 | Siemens Aktiengesellschaft | Hebe-/Rutschvorrichtung mit einem Dauermagnet-Synchronmotor |
CN104121348A (zh) * | 2014-07-10 | 2014-10-29 | 南京高精船用设备有限公司 | 自升式海洋平台封闭行星结构升降齿轮箱 |
CN106826004B (zh) * | 2016-12-14 | 2018-11-27 | 武汉船用机械有限责任公司 | 齿轮齿条升降***安装架的制作方法 |
CN106695148B (zh) * | 2016-12-15 | 2019-04-02 | 武汉船用机械有限责任公司 | 齿轮齿条升降***安装架的装配方法及装配工装 |
CN114352706B (zh) * | 2021-11-26 | 2024-04-26 | 武汉船用机械有限责任公司 | 海洋平台齿轮箱安装方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3323763A (en) * | 1965-03-29 | 1967-06-06 | Tri State Products Inc | Motor mounting rings |
US3245658A (en) * | 1965-04-12 | 1966-04-12 | John R Sutton | Offshore platform elevating equipment |
US4171027A (en) * | 1977-01-19 | 1979-10-16 | Krauss-Maffei Aktiengesellschaft | Mounting system for the terminal drive of a tracked vehicle |
FR2424243A1 (fr) * | 1978-04-26 | 1979-11-23 | Rhone Poulenc Ind | Procede d'oxyhydrochloration non polluant |
US4195950A (en) * | 1978-08-17 | 1980-04-01 | Goldman Jerome L | Shock absorbing structure and method for off shore jack-up rigs |
FR2436099A1 (fr) * | 1978-09-14 | 1980-04-11 | Brissonneau & Lotz | Mecanisme de levage pour plate-forme auto-elevatrice |
FR2492029A1 (fr) * | 1980-10-13 | 1982-04-16 | Francois Durand | Bloc pignons autoalignant et autobasculant pour patte de plate-forme auto-elevatrice |
JPS5829371B2 (ja) * | 1981-09-29 | 1983-06-22 | 三井造船株式会社 | 海上作業台ジヤツキユニツトの負荷測定装置 |
US4688662A (en) * | 1985-05-16 | 1987-08-25 | The Lamson & Sessions Co. | Energy absorber |
JPS6344010A (ja) * | 1986-08-07 | 1988-02-25 | Sumitomo Heavy Ind Ltd | 海上作業台の脚保持装置 |
FR2607165B1 (fr) * | 1986-11-26 | 1990-07-20 | Technip Geoproduction | Dispositif de suspension des jambes de support de plate-forme petroliere auto-elevatrice |
-
1989
- 1989-10-24 FR FR8913934A patent/FR2653462B1/fr not_active Expired - Lifetime
-
1990
- 1990-10-15 EP EP90402876A patent/EP0425339B1/de not_active Expired - Lifetime
- 1990-10-22 NO NO904546A patent/NO177194C/no not_active IP Right Cessation
- 1990-10-23 KR KR1019900016968A patent/KR960005724B1/ko not_active IP Right Cessation
- 1990-10-24 US US07/601,858 patent/US5102264A/en not_active Expired - Lifetime
- 1990-10-24 JP JP2286906A patent/JP2665394B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2653462B1 (fr) | 1992-02-14 |
KR910008249A (ko) | 1991-05-30 |
US5102264A (en) | 1992-04-07 |
NO904546L (no) | 1991-04-25 |
KR960005724B1 (ko) | 1996-05-01 |
JP2665394B2 (ja) | 1997-10-22 |
NO904546D0 (no) | 1990-10-22 |
NO177194C (no) | 1995-08-02 |
EP0425339A1 (de) | 1991-05-02 |
FR2653462A1 (fr) | 1991-04-26 |
NO177194B (no) | 1995-04-24 |
JPH03169910A (ja) | 1991-07-23 |
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