WO1998019018A1 - Perfectionnement d'enveloppes de piles - Google Patents

Perfectionnement d'enveloppes de piles Download PDF

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Publication number
WO1998019018A1
WO1998019018A1 PCT/GB1997/002819 GB9702819W WO9819018A1 WO 1998019018 A1 WO1998019018 A1 WO 1998019018A1 GB 9702819 W GB9702819 W GB 9702819W WO 9819018 A1 WO9819018 A1 WO 9819018A1
Authority
WO
WIPO (PCT)
Prior art keywords
pile
wrapper
vanes
ribs
sheet
Prior art date
Application number
PCT/GB1997/002819
Other languages
English (en)
Inventor
Ernest Coutts
Original Assignee
N.I.C.C. Limited
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 N.I.C.C. Limited filed Critical N.I.C.C. Limited
Priority to GB9909421A priority Critical patent/GB2334062A/en
Priority to BR9712576-8A priority patent/BR9712576A/pt
Publication of WO1998019018A1 publication Critical patent/WO1998019018A1/fr
Priority to NO991933A priority patent/NO991933L/no

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
    • E02D5/60—Piles with protecting cases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/10—Influencing flow of fluids around bodies of solid material
    • 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
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
    • B63B2021/504—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs comprising suppressors for vortex induced vibrations

Definitions

  • This invention relates to pile wrappers. It is a development of that described in our Patent EP (UK) 0295254.
  • Pile wrappers are retro-fitted to protect piles against corrosive action of sea water and marine growth.
  • the wrapper is a flexible sheet with substantially rigid members along substantially the entire length of the opposed edges which are ad acent when the wrapper is positioned around the pile. These members are then squeezed together, creating hoop stresses m the outer skin of the wrapper, and fastened.
  • the outer skin is of water impermeable flexible material, such as reinforced plastics or rubber, and an inner layer of liquid permeable material such as felted or porous plastics material can be impregnated with a water resistant sealant having corrosion inhibiting and/or biocidal components.
  • a pile wrapper comprising a flexible sheet with stiff members along opposite edges proud of the side of the sheet to be exposed and fastenable together, when the wrapper encircles a pile, to hold the sheet tensioned, the exposed side of the sheet being provided with ribs or vanes which, when the wrapper is fixed around a pile, assume generally helical configurations .
  • the effect of these ribs or vanes will be to divert a substantial amount of the energy of the water flowing past vertically, m a manner such that its dissipation has considerably less tendency to generate v.i.v.
  • the wrapper may initially be parallelogram-shaped with the edge members that are brought together parallel to the ribs or vanes. Then those members can, when fastened together and effectively unified, serve as another generally helical rib or vane.
  • the ribs or vanes may be equi- spaced. However, experiments may show that where a pile to be wrapped stands m water with a current predominantly m one direction (or that direction and its opposite) it may be better to have ribs or vanes with differentiated spacing.
  • the preferred angle of the helix and the optimum number of ribs or vanes has yet to be determined, but probably 55° - 60° to any cross-section of the pile will give a satisfactory performance, while ust three ribs or vanes (including the one formed by the oin) could be quite sufficient.
  • the sheet will normally be a composite of an outer water-impermeable material and an inner layer of liquid permeable material impregnated with a water resistant gel .
  • the ribs or vanes may be of the same material as the outer skin, but preferably they will be somewhat softer and capable of flexing to assume the contour of the pile surface. Such materials will dissipate some of the energy m the water flowing past. With rubber as the basic material, they will preferably be vulcanised onto the outer skin.
  • Figure 2 is an elevation of a pile wrapper being offered up to a pile
  • Figure 3 is a perspective view of the wrapper almost encircling the pile
  • Figure 4 is a perspective view of the wrapper secured around the pile
  • Figure 5 is an elevation of several wrappers around a pile, but not properly positioned m order to show overlap arrangements
  • Figure 6 is an elevation similar to Figure 5 but with the wrappers butted together.
  • At least one wrapper 2 is wrapped around the pile 1 and secured to counteract this. It is of parallelogram form, constructed (apart from shape) substantially as explained in EP (UK) 0295254. Two parallel edges are horizontal (or perpendicular to the axis of the pile if that is inclined) while the other two parallel edges are at an angle a (m this example 57.25°) to the first edges. Along these inclined edges are reinforced neoprene strakes 3, projecting away from the pile and bonded to a neoprene jacket forming the outer skin of the wrapper. The strakes 3 must not be rigid, as could be the equivalent members m EP (UK)
  • the outer skin has, m addition, two outwardly projecting neoprene vanes or ribs 4 parallel to the strakes 3. These may be generally equi-spaced from the strakes 3 and each other, or they may be unevenly spaced as m Figure 2 , where their mutual spacing is larger than their spacing from the strakes 3 .
  • the wrapper 2 is folded around the pile 1 as shown m Figure 3 , and secured by stainless steel nuts and bolts 5 through the strakes 3 when those have been squeezed together.
  • the wrapper then appears as m Figure 4.
  • the strakes 3 are initially straight, but their lack of complete rigidity allows them, as a result of the squeezing together action, to bend and to adopt a part helical configuration following the shape of the pile 1.
  • the vanes or ribs 4 also deform to follow parallel helical paths: indeed they may be more flexible than the outer skin of the jacket itself.
  • the wrappers are placed so that they abut substantially at the middle of a common cummerbund, which is sandwiched firmly between the wrappers and the pile.
  • the wrappers are set so that the strakes and vanes of one merge smoothly into those of the next, forming continuous helices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

L'invention concerne une enveloppe de pile comprenant une plaque (2) flexible en forme de parallélogramme dotée de membrures (3) raides mais pas totalement rigides situés le long de deux arêtes opposées en saillie du côté exposé de la plaque. Ce côté présente également des nervures ou ailettes (4) flexibles parallèles à ces membrures. Lorsqu'elles enveloppent une pile (1), les membrures (3) sont resserrées et attachées ensemble, présentant une configuration hélicoïdale, semblable à celle présentée par les nervures ou ailettes (4). L'eau s'écoulant autour de la pile est entraînée dans la direction longitudinale de la pile, ce qui réduit la tendance aux vibrations provoquées par un tourbillon.
PCT/GB1997/002819 1996-10-29 1997-10-29 Perfectionnement d'enveloppes de piles WO1998019018A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9909421A GB2334062A (en) 1996-10-29 1997-10-29 Improvements relating to pile wrappers
BR9712576-8A BR9712576A (pt) 1996-10-29 1997-10-29 Capa de estaca.
NO991933A NO991933L (no) 1996-10-29 1999-04-23 Anordning ved pµleomslag

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9622448.0A GB9622448D0 (en) 1996-10-29 1996-10-29 Improvements relating to pile wrappers
GB9622448.0 1996-10-29

Publications (1)

Publication Number Publication Date
WO1998019018A1 true WO1998019018A1 (fr) 1998-05-07

Family

ID=10802081

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002819 WO1998019018A1 (fr) 1996-10-29 1997-10-29 Perfectionnement d'enveloppes de piles

Country Status (4)

Country Link
BR (1) BR9712576A (fr)
GB (2) GB9622448D0 (fr)
NO (1) NO991933L (fr)
WO (1) WO1998019018A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335248A (en) * 1998-03-07 1999-09-15 Crp Group Ltd Vortex shedding claddings for submerged tubulars
US6561734B1 (en) * 1999-05-07 2003-05-13 Shell Oil Company Partial helical strake for vortex-induced-vibrationsuppression
US6948884B2 (en) * 2001-03-14 2005-09-27 Technip France Vortex-induced vibration reduction device for fluid immersed cylinders
WO2007053032A1 (fr) * 2005-10-31 2007-05-10 Statoil Asa Amortisseur de vibration et procédé pour son installation
CN102229224A (zh) * 2011-06-10 2011-11-02 中国海洋石油总公司 一种螺旋列板形式涡激振动抑制装置的成型模具系统
EP3085956A1 (fr) * 2015-04-21 2016-10-26 Nordex Energy GmbH Tour pour éolienne et procédé de montage d'une éolienne
CN106223867A (zh) * 2016-09-23 2016-12-14 西南石油大学 一种调节立管系统结构参数避开涡激共振的装置及方法
WO2018083054A1 (fr) * 2016-11-07 2018-05-11 Siemens Aktiengesellschaft Agencement de décollement de tourbillon
CN113718825A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 具有扰流网的海上风电基础
CN113718842A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 海上风电多桩基础
CN113718840A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 一种海上风电多桩基础

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6019549A (en) * 1996-06-11 2000-02-01 Corrosion Control International Llc Vortex shedding strake wraps for submerged pilings and pipes
GB2364557A (en) * 2000-07-08 2002-01-30 Allbrown Universal Components A strake receptor for a pipe
GB0027858D0 (en) * 2000-11-15 2000-12-27 Crp Group Ltd Protection of underwater elongate members
CN113718834A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 具有扰流件的海上风电吸力筒基础
CN113774963A (zh) * 2021-09-16 2021-12-10 盛东如东海上风力发电有限责任公司 具有消能网的海上风电防冲刷装置
CN113718838A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 海上风电吸力筒基础

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980000262A1 (fr) * 1978-07-24 1980-02-21 Moat Ltd Methode et dispositif de protection de structure sous-marine fixe
WO1993021392A1 (fr) * 1992-04-08 1993-10-28 Anthony Edward John Strange Ameliorations relatives a la protection d'elements presentant une tendance a la corrosion
EP0616940A1 (fr) * 1992-09-29 1994-09-28 Mitsui Engineering and Shipbuilding Co, Ltd. Procede pour former un film d'air sur une surface immergee d'une structure portant une partie immergee, et structure du film sur la surface immergee

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980000262A1 (fr) * 1978-07-24 1980-02-21 Moat Ltd Methode et dispositif de protection de structure sous-marine fixe
WO1993021392A1 (fr) * 1992-04-08 1993-10-28 Anthony Edward John Strange Ameliorations relatives a la protection d'elements presentant une tendance a la corrosion
EP0616940A1 (fr) * 1992-09-29 1994-09-28 Mitsui Engineering and Shipbuilding Co, Ltd. Procede pour former un film d'air sur une surface immergee d'une structure portant une partie immergee, et structure du film sur la surface immergee

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2335248A (en) * 1998-03-07 1999-09-15 Crp Group Ltd Vortex shedding claddings for submerged tubulars
GB2335248B (en) * 1998-03-07 2002-12-31 Crp Group Ltd Protection of underwater elongate members
US6561734B1 (en) * 1999-05-07 2003-05-13 Shell Oil Company Partial helical strake for vortex-induced-vibrationsuppression
US6948884B2 (en) * 2001-03-14 2005-09-27 Technip France Vortex-induced vibration reduction device for fluid immersed cylinders
WO2007053032A1 (fr) * 2005-10-31 2007-05-10 Statoil Asa Amortisseur de vibration et procédé pour son installation
CN102229224A (zh) * 2011-06-10 2011-11-02 中国海洋石油总公司 一种螺旋列板形式涡激振动抑制装置的成型模具系统
EP3085956A1 (fr) * 2015-04-21 2016-10-26 Nordex Energy GmbH Tour pour éolienne et procédé de montage d'une éolienne
CN106223867A (zh) * 2016-09-23 2016-12-14 西南石油大学 一种调节立管系统结构参数避开涡激共振的装置及方法
WO2018083054A1 (fr) * 2016-11-07 2018-05-11 Siemens Aktiengesellschaft Agencement de décollement de tourbillon
CN109952431A (zh) * 2016-11-07 2019-06-28 西门子歌美飒可再生能源公司 漩涡脱落布置结构
US10808683B2 (en) 2016-11-07 2020-10-20 Siemens Gamesa Renewable Energy A/S Vortex-shedding-arrangement
CN113718825A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 具有扰流网的海上风电基础
CN113718842A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 海上风电多桩基础
CN113718840A (zh) * 2021-09-16 2021-11-30 中国华能集团清洁能源技术研究院有限公司 一种海上风电多桩基础
WO2023040171A1 (fr) * 2021-09-16 2023-03-23 中国华能集团清洁能源技术研究院有限公司 Fondation à pieux multiples pour installation d'énergie éolienne en mer

Also Published As

Publication number Publication date
BR9712576A (pt) 1999-12-21
GB2334062A (en) 1999-08-11
NO991933D0 (no) 1999-04-23
NO991933L (no) 1999-04-23
GB9909421D0 (en) 1999-06-23
GB9622448D0 (en) 1997-01-08

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