EP1945862A1 - Installation d ancrages sous-marins - Google Patents

Installation d ancrages sous-marins

Info

Publication number
EP1945862A1
EP1945862A1 EP06794768A EP06794768A EP1945862A1 EP 1945862 A1 EP1945862 A1 EP 1945862A1 EP 06794768 A EP06794768 A EP 06794768A EP 06794768 A EP06794768 A EP 06794768A EP 1945862 A1 EP1945862 A1 EP 1945862A1
Authority
EP
European Patent Office
Prior art keywords
drilling equipment
load bearing
bearing structure
combination
bed
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
EP06794768A
Other languages
German (de)
English (en)
Other versions
EP1945862B1 (fr
Inventor
George Gibberd
Christopher Huxley-Reynard
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.)
Tidal Generation Ltd
Original Assignee
TRIDAL GENERATION Ltd
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
Priority claimed from GBGB0520891.3A external-priority patent/GB0520891D0/en
Application filed by TRIDAL GENERATION Ltd filed Critical TRIDAL GENERATION Ltd
Publication of EP1945862A1 publication Critical patent/EP1945862A1/fr
Application granted granted Critical
Publication of EP1945862B1 publication Critical patent/EP1945862B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E02D5/40—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds in open water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/52—Submerged foundations, i.e. submerged in open water

Definitions

  • This invention relates to a method of securing a load bearing structure to the bed of a sea, river or estuary, and is particularly, although not exclusively, concerned with the installation of anchorages for structures such as power generating equipment using water current energy.
  • the present invention also relates to a load bearing structure in combination with drilling equipment for use in securing the load bearing structure.
  • Fluid-operated percussive drilling equipment is existing technology and has been used for onshore and offshore drilling. In the offshore environment, however, it has only previously been deployed using surface-breaking rigid drill stringers operated from stable drilling stringers. There is therefore needed a cost-effective means of securing anchorages, moorings or foundations to the bed of a body of water.
  • a method of securing a load bearing structure to the bed of a sea, river or estuary comprising the steps of: placing the load bearing structure on the bed; forming a pile-receiving hole in the bed by means of drilling equipment which is connected to a surface vessel by flexible lines only so that the weight of the drilling equipment is supported by the bed, the drilling equipment being guided by the load bearing structure, and the load bearing structure resisting any non-vertical loads imparted to the drilling equipment; and withdrawing the drilling equipment and installing an attachment pile within the formed hole.
  • a load bearing structure for installation on the bed of a sea, river or estuary, and drilling equipment for use in the installation of the load bearing structure, the drilling equipment being adapted for deployment from a surface vessel by flexible lines only, the load bearing structure being provided with guide means for guiding the drilling equipment during a drilling operation on the bed, the guide means and the drilling equipment cooperating with each other to permit vertical displacement of the drilling equipment relative to the guide means but to resist non-vertical loads imparted to the drilling equipment.
  • a method in accordance with the present invention provides a cost-effective means of carrying out drilling in cases where beds are hard or rocky. Such a method can be employed to install a wide range of piles, from shallow-embedment "shear keys" to deeper pile embedments capable of carrying uplift forces.
  • the technique is generic and therefore suitable for any type of seabed anchorage or mooring; however, the main applications discussed below are foundations for ocean and water current energy systems, for example wave, tidal stream and offshore wind energy conversion systems.
  • Figures 1a and 1b show a method of deployment of a drilling system and attachment pile to secure a support structure to the seabed;
  • Figures 2a to 2c show the support structure at different stages of the securing process
  • Figures 3a to 3c correspond to Figures 2a to 2c but show an alternative securing process.
  • a support structure is positioned on the bed of a body of water.
  • the support structure comprises a central column 30 stabilized by support feet in the form of hollow members 1.
  • a workboat 8 lowers a drill string down into one of the hollow members 1.
  • the drill string is an axial assembly comprising all the equipment necessary to operate the drill, such that all equipment may be recovered by the workboat 8 in a single lift after drilling.
  • This may include, but is not restricted to, weights, drive motors for slow indexing of the drill bit, power swivel to receive the power for the drill from an umbilical whilst allowing the drill to index around, and guidance channels to control the exhaust fluid velocity to ensure the removal of drillings.
  • the drill string is a percussive drilling system.
  • the drill string is made up of a percussion drill 2, a weight 3, an air swivel 4 and a motor 5 to rotate the percussion drilling system.
  • Percussive drilling techniques make use of the inertia of an axially oscillating heavy piston striking the drill bit to provide the crushing forces necessary to chip off and remove rock fragments.
  • the drill strings required are much lighter than rotary drilling equipment of equivalent power, they do not require significant torque reaction, and are designed for operation underwater.
  • the full weight of the drill string is supported by a cable 32 from a deck- mounted crane 7 on the workboat 8.
  • Pneumatic, hydraulic, electric or any other connections necessary for the drill string to operate correctly are made between the drill string and the workboat 8 by flexible umbilicals 6.
  • the umbilicals 6 are fitted with helical vortex-induced vibration suppressors and/or joined together at intervals in a manner so as to provide damping against loads induced by currents.
  • the drill string is lowered through the guide provided by the hollow member 1 and comes to rest on the bed of the body of water.
  • the load of the drill string is supported by the bed of the body of water.
  • the hollow member 1 has been cross-sectioned to show the drill string in position on the bed, ready to drill.
  • the percussion drill 2 rests on the bed such that the weight of the drill string is taken off the crane hook 10. Additional weight 3 has been attached on top of the percussion drill 2 to enhance the percussive effect of the drill.
  • the drill string is turned by the motor 5, and air to power the percussion drill 2 is provided by the air swivel 4 from one of the umbilicals 6.
  • Another of the umbilicals 6 may comprise an electric cable to supply power to the motor 5.
  • the drill string has torque arms 12 that engage with guide vanes 11 on the inside of the hollow member 1.
  • the guide vanes 11 support the reaction torque of the motor 5, so that the drill operates correctly.
  • the drill 2 has completed a hole in the seabed.
  • the motor torque arms 12 slide down the guide vanes 11.
  • the drillings are ejected out of the top of the hollow member 1 to the environment.
  • the drill string can be lifted out by the deck-mounted crane on the surface (see Figure 1a).
  • the attachment pile 9 is a steel cylinder fitted with grout tubes 14 which are attached to grout lines running to the surface. Grout is pumped down these tubes to fill the annulus between the attachment pile 9 and the hollow member 1 on the one hand, and the annulus between the attachment pile 9 and the inside of the hole on the other hand. Grout is also supplied to the inside 13 of the attachment pile. The grout lines are then detached and retrieved to the surface vessel 8.
  • attachment pile 9 is attached to the support structure by mechanical means, for example bolts, welding or expanding mandrels.
  • Figures 3a to 3c show an alternative process, although the same reference numbers have been used for similar components as in Figures 2a to 2c.
  • the hollow member 1 has been cross-sectioned to show a different drill string arrangement resting on the seabed, ready to drill.
  • the percussion drill 2 rests on the seabed, with the weight taken off the crane hook 10.
  • the attachment pile 9 forms part of the drill string, and fits inside the hollow member 1 , aligning the drill string vertically.
  • the attachment pile 9 is attached to the percussion drill 2, such that as the drilling process takes place, the attachment pile 9 is pulled into the hole at the same time as the hole is created.
  • the attachment pile 9 is attached to the percussion drill 2 at its base using a remotely detachable fitting 17.
  • This fitting 17 could be a hydraulically or pneumatically actuated pin which engages with a female fitting fixed to the inside wall of the attachment pile 9.
  • the percussion drill 2 incorporates an under-reamer 16, which can be deployed for drilling, but is radially retractable in order to allow the drill string to be removed.
  • an under-reamer 16 extends the diameter of the drilled hole, so that the attachment pile 9 can fit easily inside it.
  • the under-reamer 16 retracts radially so the drill string can be removed from inside and underneath the edges of the attachment pile 9.
  • a releasable extension 18 is used to extend the height of the hollow member 1.
  • the extension 18 is attached to the top of the hollow member 1 using a tapered fitting 21.
  • the torque arms 12 engage with guide vanes 11 on the inside of the extension 18.
  • the guide vanes 11 are fitted with stops 15 at the top of the extension 18, so that when the drill string is removed from the hollow member 1, the torque arms 12 abut against the stops 15 and the extension 18 is retrieved along with the drill string. This embodiment is especially useful when a deep embedment hole is required.
  • the drill string has made a hole in the seabed by turning the motor 5 and powering the percussion drill 2.
  • the motor torque arms 12 slide down the guide vanes 11 on the inner wall of the extension 18.
  • the drillings are ejected out of the top of the attachment pile 9, from where they are ejected to the environment either out of the top of the hollow member 1 or through holes 19 made in the wall of the extension 18.
  • the under-reamer 16 is retracted and the remotely detachable fitting 17 is released.
  • the drill string can then be lifted out vertically by a deck-mounted crane on the surface.
  • the extension 18 is also lifted out by virtue of the stops 15.
  • the drill string is deployed using flexible umbilicals instead of a rigid drill string, which eliminates the need for an expensive drill ship, DP vessel, or heave- compensated crane. Installation can be achieved using smaller, cheaper, more readily available non-specialist vessels, which makes the process considerably quicker and more flexible;
  • the drill string is relatively light (typically only 10 tonnes or so for holes up to 1.2 m diameter), which makes for ease of handling and rapid deployment.
  • the deployment vessel requires a crane with sufficient capacity only to lower the drill string to the bed;
  • the drilling operation can quickly be aborted at any stage in the process simply by raising the drill string to the surface. Drilling can subsequently be restarted by lowering the drill string back down into the hole and using the template guides to pick up on the previous drilling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)

Abstract

Procédé de fixation d’une structure portante sur le lit d’une mer, d’une rivière ou d’un estuaire. Le procédé comprend les étapes consistant à : mettre en place la structure portante sur le lit ; réaliser un trou récepteur de pieu dans le lit au moyen d’un appareil de forage relié à un navire de surface par des tuyaux souples permettant à l’appareil de forage de reposer simplement sur le lit, l’appareil de forage étant guidé par la structure portante, et la structure portante résistant aux charges non verticales s’exerçant sur l’appareil de forage ; et retirer l’appareil de forage et installer un pieu de fixation dans le trou réalisé.
EP06794768.9A 2005-10-14 2006-10-13 Installation d'ancrages sous-marins Active EP1945862B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0520891.3A GB0520891D0 (en) 2005-10-14 2005-10-14 Foundation structure for water current energy system
GB0524132A GB2431189B (en) 2005-10-14 2005-11-28 Installation of underwater anchorages
PCT/GB2006/003822 WO2007042830A1 (fr) 2005-10-14 2006-10-13 Installation d’ancrages sous-marins

Publications (2)

Publication Number Publication Date
EP1945862A1 true EP1945862A1 (fr) 2008-07-23
EP1945862B1 EP1945862B1 (fr) 2017-08-23

Family

ID=37635682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06794768.9A Active EP1945862B1 (fr) 2005-10-14 2006-10-13 Installation d'ancrages sous-marins

Country Status (3)

Country Link
EP (1) EP1945862B1 (fr)
AU (1) AU2006300972B2 (fr)
WO (1) WO2007042830A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011023745A1 (fr) * 2009-08-27 2011-03-03 Geosea Nv Procédé d'installation de piliers de grand diamètre
EP2420625A3 (fr) * 2010-08-20 2013-01-09 JADE Werke GmbH Structure de base dotée d'une protection acoustique pour une éolienne offshore
GB2496412B (en) * 2011-11-10 2016-02-17 Tidal Generation Ltd Installing underwater structures
FR2985976B1 (fr) * 2012-01-20 2015-08-07 Technip France Systeme d'ancrage sous-marin pour structure flottante d'exploitation et procede d'installation d'un tel systeme
CN104032765A (zh) * 2014-07-01 2014-09-10 江苏龙源振华海洋工程有限公司 一种浅海风电场嵌岩单桩基础施工方法
CN106245626A (zh) * 2016-08-15 2016-12-21 中建三局基础设施工程有限公司 一种硬岩层旋挖钻进方法
NO345784B1 (en) * 2019-02-18 2021-08-09 Vetco Gray Scandinavia As Rigless drilling and wellhead installation
NO346286B1 (en) * 2021-03-08 2022-05-23 Vetco Gray Scandinavia As Rigless drilling and wellhead installation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921410A (en) * 1974-07-05 1975-11-25 Kenneth W Philo System and method of permafrost pile forming
JPS5341005A (en) * 1976-09-28 1978-04-14 Taisei Corp Execution method of flexible reinforced concrete pile
FR2605657A1 (fr) * 1986-10-22 1988-04-29 Soletanche Procede pour la realisation d'un pieu dans le sol, machine de forage et dispositif pour la mise en oeuvre de ce procede
GB2365463B (en) * 2000-08-01 2005-02-16 Renovus Ltd Drilling method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007042830A1 *

Also Published As

Publication number Publication date
AU2006300972A1 (en) 2007-04-19
WO2007042830A1 (fr) 2007-04-19
EP1945862B1 (fr) 2017-08-23
AU2006300972B2 (en) 2011-12-08

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