EP1493868A1 - Procédé pour installer un offshore jacket au fond de la mer - Google Patents

Procédé pour installer un offshore jacket au fond de la mer Download PDF

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Publication number
EP1493868A1
EP1493868A1 EP04076781A EP04076781A EP1493868A1 EP 1493868 A1 EP1493868 A1 EP 1493868A1 EP 04076781 A EP04076781 A EP 04076781A EP 04076781 A EP04076781 A EP 04076781A EP 1493868 A1 EP1493868 A1 EP 1493868A1
Authority
EP
European Patent Office
Prior art keywords
jacket
seabed
anchoring pile
prefitted
anchoring
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.)
Withdrawn
Application number
EP04076781A
Other languages
German (de)
English (en)
Inventor
Reinout Klaar Norfolc Jaap Prins
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.)
Presign BV
Original Assignee
Presign BV
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 Presign BV filed Critical Presign BV
Publication of EP1493868A1 publication Critical patent/EP1493868A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E02B17/027—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 steel structures
    • 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
    • E02B2017/0039—Methods for placing the offshore structure

Definitions

  • the invention relates to a method for placing an offshore jacket on the seabed as part of a supporting structure for an offshore platform or the like to be supported on, in accordance with the preamble of claim 1.
  • a method of this type is known, for example, from US-A 4,812,080, which discloses an assembly of a plurality of vertical column elements of a jacket which is provided with guide sleeves, in which sleeves piles can be prefitted.
  • the jacket including the prefitted piles is in this case delivered on a pontoon in combination with a crane ship.
  • the jacket is then lowered onto the seabed with the aid of a crane on the crane ship.
  • the prefitted piles are rammed into the seabed using a ramming block, with the ramming block being suspended from the same crane of the crane ship.
  • an offshore platform is fitted on top of the column elements.
  • the prior art has disclosed a number of solutions. For example, it is known to provide the jacket with a very wide foot structure. This produces dimensional stability. However, a drawback of this is that it makes the jacket heavy and therefore more difficult to handle. It is also known to accommodate what are known as suction anchors in the foot of the jacket. Suction anchors of this type can be activated by sucking water out of them, producing a pressure difference, with the result that the suction anchors are sucked securely into the seabed. Suction anchors of this type are, however, only effective in relatively soft, sandy seabeds. Finally, it is also known to place a foundation structure on the seabed, onto which the jacket can then be clamped. However, this requires additional work and material, making installation expensive.
  • the method comprises a step of slidably prefitting at least one anchoring pile to an offshore jacket. Then, the jacket is lowered onto the seabed with the aid of a lifting device. Immediately after or during this step of lowering the jacket onto the seabed, an initial penetration is applied to the anchoring pile over an initial penetration depth into the seabed. During this initial penetration, the jacket is held in place by the lifting device. Only after the jacket has in this way been sufficiently anchored to the seabed is the anchoring pile, in a subsequent step, introduced further into the seabed down to a desired final depth, with the aid of a separate main driving installation.
  • the jacket is now advantageously provided with reliable support and/or locked such that it cannot fall over or move in an unintended way throughout the entire sequence of method steps, specifically, in succession, by the support provided by the lifting device, then by the initial penetration of the anchoring pile and ultimately by the anchoring pile having been sunk to the desired final depth.
  • the lifting device comprises, for example, a crane ship or lifting platform with a crane from which the jacket can be suspended.
  • the jacket can advantageously remain suspended from the crane.
  • the initial penetration may, for example, be imparted to the anchoring pile by drive means which are prefitted in or on the anchoring pile, for example a vibratory unit, a ramming unit or a drilling and/or flushing unit.
  • prefitted drive means are to be understood as meaning both drive means which are supported directly on the anchoring pile and drive means which are suspended from the jacket in such a manner that they are in a suitable position with respect to the anchoring pile to either exert a driving force on the anchoring pile or to sufficiently reduce the resistance to penetration of the anchoring pile during the initial penetration.
  • the jacket is detached from the lifting device after the step of initial penetration. Even more particularly, after this step of releasing the jacket from the lifting device, the main driving installation for sinking the anchoring pile to the desired final depth is suspended from the lifting device.
  • the main driving installation may in this case comprise a ramming block suspended from a crane of a crane ship or lifting platform.
  • the invention also relates to an offshore jacket in accordance with claim 8.
  • the jacket comprises at least one anchoring pile which is prefitted slidably on or in the jacket, with drive means being provided prefitted on top of the anchoring pile.
  • An offshore jacket of this type is intended to be positioned on the seabed and to be anchored thereto using the method according to the invention as described above.
  • the drive means prefitted on the anchoring pile then serve to apply the initial penetration into the seabed over the initial penetration depth to the anchoring pile immediately after or during the step of lowering the jacket onto the seabed.
  • prefitted drive means are to be understood as meaning both drive means which are supported directly on the anchoring pile and drive means which are suspended from the jacket in such a manner that they are located in a suitable position with respect to the anchoring pile to either exert a driving force on the anchoring pile or sufficiently reduce the penetration resistance of the anchoring pile during the initial penetration.
  • an offshore jacket is denoted overall by reference numeral 1.
  • the jacket 1 is intended to form part of a supporting structure which is intended to support an offshore platform or the like.
  • Guide sleeves 3 in which anchoring piles 4 are slidably prefitted are secured to the jacket 1.
  • a vibratory unit 7 is prefitted on top of each anchoring pile 4.
  • the vibratory unit 7 is in this case temporarily suspended from a holding means 8 which projects from the jacket 1 at the top.
  • the jacket 1 is provided with a hoisting eyelet 9, via which it is suspended from a crane 10 of a lifting device of a crane ship or lifting platform, which is not shown in more detail here.
  • the guide sleeves 3 are preferably provided with actuable clamping members.
  • the guide sleeves it is possible for the guide sleeves to be designed with a clamping fit matched to the anchoring piles in such a manner that the anchoring piles therein can be slid downwards after they have overcome the clamping resistance associated with the clamping fit.
  • the vibratory unit 7 it is also possible for the vibratory unit 7 to be coupled to the anchoring pile 4 and for this combination of vibratory unit and anchoring pile to be suspended from the associated holding means of the jacket 1.
  • Fig. 1 shows the step of using the crane 10 to lower the jacket 1 onto the seabed 12.
  • the vibratory units 7 are activated, and if desired clamping members in the guide sleeves 3 are unlocked.
  • an initial penetration into the seabed 12 over an initial penetration depth is imparted to the anchoring piles 4.
  • this vibratory introduction of the anchoring piles 4, which is shown in Fig. 2 the jacket 1 remains suspended from the crane 10.
  • the vibratory units 7 are switched off, the jacket 1 is released from the crane 10, and the vibratory units 7 are removed from the anchoring piles 4 with the aid of the crane 10 (cf. Fig. 3). Then, the anchoring piles 4 are one by one rammed into the seabed 12 down to the desired final depth with the aid of the ramming block 14 suspended from the crane 10. Finally, the anchoring piles can be fixedly joined to the jacket 1 (the guide sleeves 3), for example by means of welding or grouting using cement.
  • the advantageous result of this is that while the jacket 1 is being lowered onto the seabed 12, the pile parts which project downwards are pressed into the seabed 12 under the influence of the deadweight of the anchoring piles 20 and of the jacket 1.
  • the jacket 1 After the desired initial penetration depth, which may partially or completely correspond to the downwardly projecting part of the anchoring piles 20, has been reached in this way, it is once again advantageously possible for the jacket 1 to be detached from the crane 10, after which the anchoring piles 20 can be rammed further into the seabed 12, down to the desired final depth, with the aid of a separate main driving installation, which is in this case too formed by a ramming block 14 suspended from the crane 10 (cf. Figs 6-8).
  • the retaining members 21 are in this case also forced into the seabed 12, where they are responsible for more secure anchoring of the anchoring piles 20 in the seabed 12.
  • the anchoring piles 20 are advantageously of hollow design, and a drilling and/or flushing unit 25 is located in each hollow anchoring pile 20.
  • the drilling and/or flushing units 25 are in this case also suspended from the holding means 8. Activating the drilling and/or flushing units 25 during the initial penetration causes the penetration resistance to be reduced to a sufficient extent, with the result that the anchoring pile 20 can penetrate into the seabed 12 more quickly, easily and to a greater depth under the influence of the deadweight of the piles and the jacket.
  • each drilling and/or flushing unit 25 can be removed again from the hollow anchoring pile 20 with the aid of the crane 10, which has the advantage that they can be reused during subsequent positioning of another offshore jacket.
  • the offshore jacket is denoted by reference numeral 30.
  • Guide sleeves 31 in which there are prefitted anchoring piles 32 are connected to the jacket 30.
  • a ramming unit 34 is prefitted on each anchoring pile 32.
  • the combinations of anchoring piles 32 and ramming units 34 are in this case at least initially longer than the height of the jacket 30.
  • clamping members 35 which are in this case connected to the sleeves 31.
  • the positioning method may otherwise be substantially identical to that used in the embodiment shown in Figs 1-4.
  • anchoring piles can be held slidably in tubes which extend substantially over the entire height of the jacket and/or form bearing parts of the jacket.
  • An offshore platform or the like can be supported directly on the jacket, which for this purpose then preferably projects slightly above sea level. It is also possible for the jacket to end under water and merely to form a horizontal reinforcing frame. An offshore platform or the like can then be supported directly on the anchoring piles and/or on a partial structure fitted to the jacket.
  • the jacket may also comprise a plurality of individual elements, for example a base frame and an intermediate frame which are connected to one another, for example, by the anchoring piles.
  • an inexpensive and reliable method for placing an offshore jacket on the seabed is provided, allowing fast and reliable placing of an offshore jacket according to the invention.
  • This allows considerable cost savings to be made, for example on account of the fact that a crane ship, the costs of using which are very high, does not have to be deployed for such a long period of time.
  • the jacket can advantageously be of slender design.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Foundations (AREA)
  • Earth Drilling (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
EP04076781A 2003-07-03 2004-06-17 Procédé pour installer un offshore jacket au fond de la mer Withdrawn EP1493868A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1023813A NL1023813C2 (nl) 2003-07-03 2003-07-03 Werkwijze voor het op de zeebodem plaatsen van een offshore jacket.
NL1023813 2003-07-03

Publications (1)

Publication Number Publication Date
EP1493868A1 true EP1493868A1 (fr) 2005-01-05

Family

ID=33432537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04076781A Withdrawn EP1493868A1 (fr) 2003-07-03 2004-06-17 Procédé pour installer un offshore jacket au fond de la mer

Country Status (2)

Country Link
EP (1) EP1493868A1 (fr)
NL (1) NL1023813C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448358A (en) * 2007-04-12 2008-10-15 Tidal Generation Ltd Installation of underwater ground anchorages
GB2460172A (en) * 2008-05-24 2009-11-25 Marine Current Turbines Ltd Installation of a pile in the seabed using a guide structure
GB2469190A (en) * 2009-04-01 2010-10-06 Marine Current Turbines Ltd Underwater installation of columns or piles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607198A (en) * 1948-05-25 1952-08-19 Standard Oil Dev Co Foundation for use with soft surface formation
US4367800A (en) * 1979-02-27 1983-01-11 Hollandsche Beton Groep N.V. Subsea pile driver

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4812080A (en) 1987-07-24 1989-03-14 Atlantic Richfield Company Offshore platform jacket and method of installation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607198A (en) * 1948-05-25 1952-08-19 Standard Oil Dev Co Foundation for use with soft surface formation
US4367800A (en) * 1979-02-27 1983-01-11 Hollandsche Beton Groep N.V. Subsea pile driver

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448358A (en) * 2007-04-12 2008-10-15 Tidal Generation Ltd Installation of underwater ground anchorages
GB2448358B (en) * 2007-04-12 2009-07-08 Tidal Generation Ltd Installation of underwater ground anchorages
US20100119309A1 (en) * 2007-04-12 2010-05-13 Tidal Generation Limited Installation of underwater ground anchorages
US8845235B2 (en) 2007-04-12 2014-09-30 Tidal Generation Limited Installation of underwater ground anchorages
GB2460172A (en) * 2008-05-24 2009-11-25 Marine Current Turbines Ltd Installation of a pile in the seabed using a guide structure
GB2460172B (en) * 2008-05-24 2013-01-02 Marine Current Turbines Ltd Installation of structures in water
GB2469190A (en) * 2009-04-01 2010-10-06 Marine Current Turbines Ltd Underwater installation of columns or piles
GB2469190B (en) * 2009-04-01 2015-01-28 Bauer Maschinen Gmbh Methods and apparatus for the installation of columns/piles
US9605400B2 (en) 2009-04-01 2017-03-28 Marine Current Turbines Limited Methods and apparatus for the installation of columns/piles

Also Published As

Publication number Publication date
NL1023813C2 (nl) 2005-01-04

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