EP0287442A1 - Vorgespanntes Stahlrohr, insbesondere für Ankerleinen von vertikal verankerten Bohrplattformen, Verfahren zu dessen Handhabung und Aufstellung sowie Plattform mit solchen Rohren - Google Patents

Vorgespanntes Stahlrohr, insbesondere für Ankerleinen von vertikal verankerten Bohrplattformen, Verfahren zu dessen Handhabung und Aufstellung sowie Plattform mit solchen Rohren Download PDF

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Publication number
EP0287442A1
EP0287442A1 EP88400853A EP88400853A EP0287442A1 EP 0287442 A1 EP0287442 A1 EP 0287442A1 EP 88400853 A EP88400853 A EP 88400853A EP 88400853 A EP88400853 A EP 88400853A EP 0287442 A1 EP0287442 A1 EP 0287442A1
Authority
EP
European Patent Office
Prior art keywords
tube
cables
steel
platform
fibers
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
EP88400853A
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English (en)
French (fr)
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EP0287442B1 (de
Inventor
Gilbert Huard
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.)
Saipem SA
Original Assignee
Bouygues Offshore SA
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 Bouygues Offshore SA filed Critical Bouygues Offshore SA
Publication of EP0287442A1 publication Critical patent/EP0287442A1/de
Application granted granted Critical
Publication of EP0287442B1 publication Critical patent/EP0287442B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof

Definitions

  • the present invention relates to a steel tube for constituting a line subjected in service to a tension exerted between opposite bearing points, in particular for the constitution of an anchoring line of an offshore production platform of the type with taut lines, as well as a method of handling and placing such a tube.
  • This type of platform which allows drilling or production in the deep sea, is a floating platform stowed at the bottom of the sea by means of lines anchored to bases or weights arranged at the bottom of the sea; the anchor lines, which generally consist of a bundle of steel tubes or cables, are provided at each of their ends with a flexible or articulated connector, which allows them to always work in tension, with torques very low bending despite the efforts undergone by the floating platform and transmitted to these lines.
  • An anchor line which consists of a series of tubular sections of steel prestressed longitudinally individually by an inner cable and assembled step by step by threaded parts (publication EP-A-0 191 992).
  • the screwed portion of the sections is not prestressed and the previously prestressed portion of the sections is only prestressed at a compression force lower than the servid tension of the line.
  • the present invention aims to overcome this drawback.
  • this is achieved by constituting the anchoring line by a tube formed of a series of tubular steel sections and terminated at each end by a support connector, these sections being preloaded longitudinally by a bundle of cables which is common to all of the sections, the prestressing being adjusted to a value greater than the value of the tension of the line in service so that in service, the length of the tube between the supports is maintained in compression.
  • the invention therefore allows the steel to no longer work in tension but still in compression, hence a very good fatigue behavior.
  • the cables are in particular made of glass fibers, carbon or other mineral materials.
  • mineral fibers such as glass fibers and carbon fibers have a tensile strength much higher than that of ordinary steel, generally of the order of 3000 MPa, or about seven times the resistance of a steel.
  • the principle of the invention therefore makes it possible to combine the respective advantages of mineral fibers and steels, taking advantage of the very high tensile strength of the fibers to prestress the steel, which can then be stressed at a stress rate much lower than that of fibers, resulting in a significant decrease in the lengthening of the anchor lines.
  • the cables are blocked by a fiber coating resin.
  • the cables are blocked by mechanical centralizers.
  • the tube forms a hermetically sealed volume, and the outside diameter of the steel tube is preferably chosen so that the apparent weight of the tube in water is substantially zero.
  • the tube is made up of sections which are only kept assembled end to end by said prestress.
  • the fibers constitute a means of assembling the tube, when the latter is formed of sections arranged end to end, and avoid the use of mechanical or welding means of assembly, always difficult to implement in an environment. marine.
  • the invention also relates to a method of handling and setting up such a tube consisting of sections maintained and assembled by prestressing, this method being applied to the constitution of an anchoring line of a production platform at sea with taut lines.
  • this process is characterized by the steps consisting in: - Preassemble, on the ground, the sections of tube connected together by the non-stretched cables as well as the lower and upper connoisseur elements, then wind this assembly on a polygonal contour handling drum with a side substantially equal to the length of a section tube, - unroll the assembly in the platform anchoring well, - apply tension to the cables, so as to prestress the tube, - connect the lower connector element to a base placed at the bottom of the sea, - tension the tube by conventional tensioning methods and connect the upper connector element to the platform.
  • the tube consists of elements of small diameter and thick.
  • the ends of the tubular steel elements 10 are provided with cutouts 11, 12 machined to allow self-centering, good contact and good alignment.
  • prestressing cables 20 made of mineral fibers coated with resin.
  • the bundle of contiguous cables may also be optionally embedded in an appropriate coating resin.
  • the steel elements 10 are assembled in the same way as in the previous embodiment; only their dimensions have been changed.
  • the prestressing cables 20 are no longer contiguous, but held in position by means of a guide device consisting, for each section of tube, of two disks 40 perforated in 41 to allow the prestressing cables to pass and remain in place 20.
  • This guide device (disc 40 and central tube 42) slides with little play inside the tubular element 10 made of steel, a gap is provided at 43 between the successive guide devices, so as to be able to absorb without transmission. of stress the different stresses that the tube will undergo.
  • perforations 44 are provided to ensure the communication of the volumes located between two successive discs, so as for example to allow the emptying of the entire interior volume of the tube.
  • FIG. 5 illustrates an application of such a tube to an offshore production platform with tight lines.
  • the tubes of the invention can be very advantageously used whenever the problems of significant elongation, long clean period or fatigue of the metal are critical when conventional steel systems are used.
  • the tube corresponding to the embodiment of FIGS. 3 and 4 is preferably used.
  • the diameter of the steel elements can then be chosen so that the apparent weight of the prestressed steel tube in the water is practically zero after the water contained inside the elements has been drained.
  • the tube 10 is provided at the bottom with a connector 50 terminated by a hemispherical end piece 51 which is received in a member 100 secured to the anchoring foundation.
  • connection between the lower connector 50 and this element 100 forms a ball joint allowing the transmission of tension forces from the line to the foundation, and which must induce only very low bending torques. This is achieved by means of blocks 101 in laminated neoprene, or hemispherical ports in graphite bronze.
  • the fiber prestressing cables are embedded in resin 52 inside the element 50.
  • a drainage tube 53 is provided with a non-return valve at the top of this element 50, communicating with the interior volume of the prestressed tube 10.
  • the tube is provided a prestressing box 60 connected to the floating platform 200.
  • This prestressing box comprises an element 61 of cast steel forming the bottom of the box and the male part of the ball joint for anchoring to the platform; this part comes to bear on a crown 201 in molded steel by means of blocks 202 of laminated neoprene or hemispherical ports in graphite bronze so as to minimize the transmission of bending torques, as in the case of the lower connector.
  • Spacers 62 make it possible to diverge the prestressing cables at the outlet of the steel tube and direct them towards an anchoring ring 63, to which they are conventionally fixed by means of conical keys and resin injection.
  • the operating voltage of the prestressing cables is continuously monitored by control systems, so as to monitor their behavior.
  • the box 60 is closed by a watertight cover 64 provided with a nozzle 65 to which a flexible hose will be connected for emptying the tube 10 by means of an air or nitrogen flush, the water then being discharged by the drainage tube and the non-return valve 53 of the lower connector.
  • This emptying device could even remain permanently connected for emptying any leaks in service, or pressurizing the tube to check its tightness.
  • the box 60 finally comprises a set of ears 66 allowing the attachment of the devices 67 for handling and tensioning the tube.
  • the prestressing box is installed inside a well 203 enlarged to the right of the box to allow its movement.
  • This well can be put under air pressure during the installation and maintenance phases so that the prestressing box and the support device are out of water.
  • the crown 201 of the ball joint bears against the bottom of this well by means of a system of adjustable wedges 204; the diameter of the opening 205 in the bottom of the well must be sufficient to allow the passage of the lower connector 50, the anodes and any floats.
  • the platform may include, for each leg, an anchoring line formed from seven to eight tubes thus produced and put in place.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Piles And Underground Anchors (AREA)
EP88400853A 1987-04-10 1988-04-08 Vorgespanntes Stahlrohr, insbesondere für Ankerleinen von vertikal verankerten Bohrplattformen, Verfahren zu dessen Handhabung und Aufstellung sowie Plattform mit solchen Rohren Expired - Lifetime EP0287442B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705115 1987-04-10
FR8705115A FR2613815B1 (fr) 1987-04-10 1987-04-10 Tube en acier precontraint, notamment pour la realisation de lignes d'ancrage de plates-formes de production du type a lignes tendues, procede de manutention et de mise en place d'un tel tube, et plate-forme comprenant un tel tube

Publications (2)

Publication Number Publication Date
EP0287442A1 true EP0287442A1 (de) 1988-10-19
EP0287442B1 EP0287442B1 (de) 1993-01-13

Family

ID=9350007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400853A Expired - Lifetime EP0287442B1 (de) 1987-04-10 1988-04-08 Vorgespanntes Stahlrohr, insbesondere für Ankerleinen von vertikal verankerten Bohrplattformen, Verfahren zu dessen Handhabung und Aufstellung sowie Plattform mit solchen Rohren

Country Status (6)

Country Link
US (1) US4923337A (de)
EP (1) EP0287442B1 (de)
BR (1) BR8801697A (de)
DK (1) DK193888A (de)
FR (1) FR2613815B1 (de)
NO (1) NO172842C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103523174A (zh) * 2013-10-21 2014-01-22 武昌船舶重工有限责任公司 一种暗式锚穴及制造安装工艺
CN103950515A (zh) * 2014-05-05 2014-07-30 武昌船舶重工有限责任公司 一种暗式锚穴
PT107606A (pt) * 2014-04-25 2015-10-26 Miguel Marinho Mendes Abreu Plataforma flutuante estabilizada por amarrações tensionadas para gerador de energia eólica com flutuadores de betão armado e câmara de amarração visitável

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5039255A (en) * 1990-11-13 1991-08-13 Conoco Inc. Termination for kinkable rope
US5118221A (en) * 1991-03-28 1992-06-02 Copple Robert W Deep water platform with buoyant flexible piles
US6012873A (en) * 1997-09-30 2000-01-11 Copple; Robert W. Buoyant leg platform with retractable gravity base and method of anchoring and relocating the same
US6109834A (en) * 1998-08-28 2000-08-29 Texaco Inc. Composite tubular and methods
US8069624B1 (en) * 2007-10-17 2011-12-06 Sorkin Felix L Pocketformer assembly for a post-tension anchor system
RU2526568C2 (ru) * 2012-05-05 2014-08-27 Общество с ограниченной ответственностью "Троицкий Крановый Завод" Устройство для соединения якоря со швартовой балкой
CN109112977B (zh) * 2018-09-04 2024-01-16 南京林业大学 一种快速预应力加固桥梁梁体结构及方法
CN109937996B (zh) * 2019-04-08 2024-04-09 华南农业大学 一种旋翼悬浮式宽幅喷杆喷雾机及其控制方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085939A (en) * 1980-09-01 1982-05-06 Mcalpine & Sons Ltd Sir Robert Marine mooring cables
EP0191992A1 (de) * 1984-12-21 1986-08-27 Conoco Phillips Company Zusammengesetztes Element zum Verankern von Bauwerken in tiefer See

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3378965A (en) * 1965-10-18 1968-04-23 Alben V. Broquist Prestressed concrete reinforcing arch structure
US3709182A (en) * 1970-02-24 1973-01-09 Deep Oil Technology Inc Anchor means and method of installing the same
US4297965A (en) * 1979-09-06 1981-11-03 Deep Oil Technology, Inc. Tension leg structure for tension leg platform
US4398377A (en) * 1980-01-25 1983-08-16 Romig Jr Byron A Structural member with equalized internal tension
FR2484355A1 (fr) * 1980-06-12 1981-12-18 Precontrainte Structures Ste F Hauban sous-marin
FR2535281A1 (fr) * 1982-10-29 1984-05-04 Precontrainte Ste Fse Hauban sous-marin a tirants en beton, notamment pour haubanage oblique
US4768455A (en) * 1983-01-07 1988-09-06 Conoco Inc. Dual wall steel and fiber composite mooring element for deep water offshore structures
US4521135A (en) * 1983-06-28 1985-06-04 Chevron Research Company Pressurized gas filled tendons
CH662595A5 (de) * 1983-08-22 1987-10-15 Losinger Ag Verankerung von freischwingenden zugelementen aus stahl eines dynamisch beanspruchten bauteiles.
FR2554780B1 (fr) * 1983-11-14 1986-01-17 Inst Francais Du Petrole Procede pour la fabrication et le prepositionnement en vue de leur arrimage definitif, des lignes d'une plate-forme a lignes tendues
US4630970A (en) * 1985-09-13 1986-12-23 Exxon Production Research Co. Buoyancy system for submerged structural member

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085939A (en) * 1980-09-01 1982-05-06 Mcalpine & Sons Ltd Sir Robert Marine mooring cables
EP0191992A1 (de) * 1984-12-21 1986-08-27 Conoco Phillips Company Zusammengesetztes Element zum Verankern von Bauwerken in tiefer See

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103523174A (zh) * 2013-10-21 2014-01-22 武昌船舶重工有限责任公司 一种暗式锚穴及制造安装工艺
PT107606A (pt) * 2014-04-25 2015-10-26 Miguel Marinho Mendes Abreu Plataforma flutuante estabilizada por amarrações tensionadas para gerador de energia eólica com flutuadores de betão armado e câmara de amarração visitável
CN103950515A (zh) * 2014-05-05 2014-07-30 武昌船舶重工有限责任公司 一种暗式锚穴

Also Published As

Publication number Publication date
DK193888D0 (da) 1988-04-08
NO172842B (no) 1993-06-07
DK193888A (da) 1988-10-11
NO881521L (no) 1988-10-11
NO881521D0 (no) 1988-04-08
FR2613815B1 (fr) 1989-06-23
BR8801697A (pt) 1988-11-16
US4923337A (en) 1990-05-08
FR2613815A1 (fr) 1988-10-14
NO172842C (no) 1993-09-15
EP0287442B1 (de) 1993-01-13

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