WO2018091395A1 - Procédé de démantèlement de structures de fondation en mer - Google Patents

Procédé de démantèlement de structures de fondation en mer Download PDF

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Publication number
WO2018091395A1
WO2018091395A1 PCT/EP2017/079009 EP2017079009W WO2018091395A1 WO 2018091395 A1 WO2018091395 A1 WO 2018091395A1 EP 2017079009 W EP2017079009 W EP 2017079009W WO 2018091395 A1 WO2018091395 A1 WO 2018091395A1
Authority
WO
WIPO (PCT)
Prior art keywords
hollow pile
hollow
pile
pressure
monopile
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.)
Ceased
Application number
PCT/EP2017/079009
Other languages
German (de)
English (en)
Inventor
Niels Bijkersma
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.)
Innogy SE
Original Assignee
Innogy SE
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 Innogy SE filed Critical Innogy SE
Priority to EP17797159.5A priority Critical patent/EP3542000B1/fr
Publication of WO2018091395A1 publication Critical patent/WO2018091395A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
    • E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing

Definitions

  • the invention relates to a method for the dismantling of offshore or onshore foundation structures with at least one hollow pile, which is driven at its leading open end enclosing soil in the ground.
  • Foundation structures of the aforementioned kind are, for example, “monopiles” or “tripiles”. Such foundation structures are mainly used in onshore or offshore wind turbines as well as in offshore oil and gas production plants.
  • Offshore foundation structures typically include one or more piles that were driven in shallow coastal waters in the subsoil, for example by Ram ⁇ men or vibratory driving.
  • monopiles with a diameter of 3 to 4 m are driven into the seabed to a depth of about 30 m.
  • a typical offshore wind turbine comprises for example the aforementioned monopile, a mounted on the monopile transition piece (transition piece) and attached to the transition piece construction, wherein ⁇ example as tower building of a plurality of pipe sections having thereon a nacelle, an in the nacelle ange ⁇ arranged generator and arranged on the shaft of the generator rotor.
  • the invention is therefore based on the object to provide a method for the dismantling of foundation structures that is easier than the known methods feasible.
  • One aspect of the present invention relates to a method for the demolition of foundation structures with at least one hollow pile, which is driven at its leading open end enclosing soil in the seabed, wherein the method is characterized in that the hollow pile is extracted hydraulically. Thereby expelling or puffing of the hollow pile is conveniently effected hyd ⁇ raulisch, wherein the weight of the hollow pile is preferably collected by egg ner provided for this purpose lifting means.
  • a foundation pile of an onshore structure or an offshore structure for example in the form of a monopile to understand.
  • This is a cylindrical steel pile which is open at its leading end and has been driven into the seabed, for example by means of ramming or vibration, so that the seabed (sand, gravel, clover and rock) is enclosed in the hollow pile Cavity has penetrated.
  • the hollow pile is closed at its leading end by the material that has penetrated into it.
  • the other upper end of the green ⁇ dung pile can be located above the waterline. On this end, a transition piece is usually open-minded, which receives the structure.
  • the method can be carried out without a prior clearing of the hollow pile and without the use of cutting tools.
  • it is not necessary to perform cutting work or welding under water.
  • the hollow pile to extract completely ie completely zuand ⁇ from the subsoil out and / or pull out, so that no residues remain in the sea floor.
  • the method comprises the following method steps: a) closing openings of the hollow pile, b) attaching a connection for a fluid line to the hollow pile so that the connection communicates with a cavity of the hollow pile, c) establishing a connection of Fluid line with the connection, d) attaching a hoist to the hollow pile, e) applying pressure medium to the hollow pile with a pressure medium provided via the fluid line, and f) recovering the hoist by means of a crane with extraction of the hollow pile, the crane receiving the load of the hollow pile.
  • the opening at the leading end of the hollow pile to seal all remaining openings or close tightly and to pressurize the cavity in the interior of the hollow pile with pressure, so that the pressure generates within the hollow pile a force that supports and / or causes extraction of the hollow pile.
  • the method expediently comprises a pressure-tight closure of the openings at least at an upper, non-embedded end of the hollow pile.
  • the pressure medium can be pumped, for example, with a pressure between 10 and 30 bar in the cavity of the hollow pile, but depending on the geological conditions, it may also be necessary to spend a multiple of this pressure.
  • the fluid pressure built up within the pressure-sealed hollow pile acts on the floor in the interior of the hollow pile, which is formed by the substrate and accordingly has a location-dependent permeability.
  • the permeability is greater than in clay- containing or cohesive soils.
  • the escape of water / gas through the soil down to the top of the hollow pile is associated with a pressure loss.
  • Both the decreasing volume as also the pressure loss must be compensated by pumps or compressors. In the case of a particularly high permeability of the soil, the pressure and volume losses may be so great that the required pump or compressor capacity is not sufficient for extraction of the hollow pile.
  • a particularly advantageous and expedient variant of the Ver ⁇ driving which is particularly suitable for the extraction of hollow piles in non-cohesive soil, is characterized in that before carrying out method step e) has a reduced copy ⁇ tion of a hydraulically operative during method step e) ⁇ seed cross section of the hollow pile in the region of a lower unclamped end of the hollow pile.
  • the hydraulically effective cross-section of the hollow pile is defined at its lower, non-clamped end by the cross-section closed by the substrate.
  • the lower end of the hollow pile according to the present invention is thus the lower end of the cavity enclosed by the hollow pile, ie the transition region between the cavity and the floor.
  • the reduction of the hydraulically effective cross section of the hollow pile in the region of a lower, not embedded in the ground end can for example be done by a flow restrictor in the form of a diaphragm, a plug or the like is installed in the hollow pile before Druckstoffbeetzschlagung.
  • the hollow pile is filled at least partially with a drilling fluid, for example in the form of a bentonite suspension, before or during the process step e).
  • a drilling fluid for example in the form of a bentonite suspension
  • the permeability of the substrate in the region of the tip of the hollow pile can be reduced.
  • the method is used in the demolition of an offshore foundation structure, the use of a crane ship for ex ⁇ traction of the hollow pile is provided, wherein a crane provided on the crane receives the weight of the hollow pile.
  • the closing of openings of the hollow pile may include the introduction of at least one closure body into or at least one opening of the hollow pile. It is particularly advantageous if at least one closure body is inserted from the inside in an opening of the hollow pile, so that a pressure Mitt same ⁇ aufschlagung of the hollow pile enhances a seal of the closing body or is effected.
  • transition piece Remains the transition piece on the formed as monopile hollow pile, so for example, a cable entry into the transition piece (J-tube entry hole) are sealed from the inside.
  • the method step a) the introduction of at least one closure body or attaching at least one lid closure in each case an upper and lower non-embedded end of the hollow pile or at each of an upper and lower non-embedded end of the hollow pile, wherein the cross section of the hollow pile is only partially closed at a leading non-embedded end.
  • the non-embedded end of the hollow pile in the sense of the preceding Embodiments is the transition region of the hollow pile between the cavity and the ground, wherein the bottom is formed by the underground enclosed by the hollow pile. Below this About ⁇ transition region of the hollow pile is clamped from the ground, this section is also called a clamping length.
  • the clamping length can in principle be greater than the unclamped length of the hollow pile.
  • the pressurizing agent comprises a first and second pressure increase, wherein the first pressure increase is used to check the compressive strength of the hollow pile.
  • a liquid and / or gas can be ver ⁇ spent.
  • liquids for example, water and / or a drilling fluid into consideration.
  • gas for example, air is considered.
  • a combination of a loading of the hollow pile with liquid and with gas is mög ⁇ Lich. For example, first a liquid can be used as a pressure medium, then the liquid can partially displaced by a gas, so that in addition the buoyancy force of the gas is used for extraction.
  • a drilling fluid can also be used as the fluid.
  • the drilling fluid may be, for example, a solid / water suspension comprising one or more components selected from a group comprising clay minerals, bentonite, barium sulfate, and polymers which can be used to increase the viscosity of the fluid in a particularly advantageous manner.
  • a mixture of polymers and water can be used as liquid.
  • pumps and / or compressors on an upper cover or on an upper lid closure of the hollow pile or to attach to a receptacle to be provided on the hollow pile. This has the advantage that no relative movement takes place between the installation for the pressurizing agent and the hollow pile during the extraction. As a result, hoses and connections are not loaded. In addition, the installation of long high-pressure hoses is unnecessary.
  • the method according to the invention comprises the extraction of an offshore foundation element in the form of a monopile as a hollow pile, prior to the attachment of a connection for a fluid line a possibly existing connection element or a possibly existing transition piece for a tower construction or a platform is removed and the method of attaching a Cover ⁇ closure on the upper open end of the monopile includes.
  • a cover ⁇ closure on the upper open end of the monopile includes.
  • FIG. 1 shows a schematic view of an offshore foundation structure, which illustrates the implementation of the method according to the invention according to a first exemplary embodiment
  • FIG. 2 shows a schematic view of an offshore foundation structure, which implements the method according to the invention a second embodiment illustrated.
  • FIG. 1 shows a schematic view of an offshore foundation structure in the form of a monopile 1 as a cylindrical hollow pile in the sense of the present invention, which is driven into the seabed 2 over a clamping length L.
  • the monopile 1 is part of an already partially dismantled offshore structure, for example a tower construction with a wind power generator.
  • the clamping length L of the monopile 1 in the seabed 2 may be for example about 30 m.
  • the monopile In the area of the clamping length L, the monopile is filled with the material of the seabed 2.
  • the method according to the invention comprises the pressure-tight closure of the monopile 1 after the structures have been removed, for example in the form of a platform or the aforementioned tower structure.
  • Figure 1 illustrates a substep of erfindungsge ⁇ MAESSEN method.
  • An upper opening of the monopile 1 was provided with a first lid closure 5.
  • At the first lid closure eyelets 6 are provided, to which a lifting harness 7 of a crane 8 is posted.
  • the crane 8 is placed on a crane ship 9.
  • the monopile 1 comprises a further opening in the form of a Kabe ⁇ lein Entry 10, which is designed as a so-called "J-tube".
  • the representation is far easier, since it is evident to the skilled person that the monopile certainly comprise more than just two openings
  • the cable entry 10 is sealed with a closure body 11.
  • a connection is provided for a fluid line designed as a high-pressure line, which communicates with the cavity of the monopile 1.
  • a high-pressure line is connected to the monopile 1 via the crane ship 9 with pumps and other infrastructure
  • the pumps and the infrastructure otherwise required can also be provided via an additional supply ship
  • the filtered seawater enters the hollow space of the monopile via the high-pressure line 1 with a pressure of beisp For example, pumped in between 10 and 30 bar.
  • the monopile 1 undergoes a hydrau ⁇ metallic force which is greater than or equal to the gradually decreasing frictional force on the inner and outer surface of the monopile. 1
  • the monopile 1 is lifted by means of the crane 8 via the lifting gear 7.
  • the crane 8 only overcomes the weight of the monopile. 1 In this way, the monopile 1 is completely hy ⁇ cally extracted and received by the crane ship 9 or a transport ship.
  • a second cover closure 11 was installed as a flow restrictor for the pressure medium before the pressure medium is applied to the monopile 1 in its lower end.
  • the lower end in this sense is the transition region between the cavity of the hollow pile and the seabed 2.
  • the clamping length of the monopile 1, as already mentioned, can be quite longer than the unclamped length.
  • the second cover closure 11 as a flow restrictor serves to prevent an excessive loss of pressure medium in the seabed 2 or in the seabed 3 in the event that the seabed 3 is relatively permeable.
  • the second cover closure 11 forms in a horizontal plane a circular cross-sectional area whose diameter is slightly smaller than the inner diameter of the monopile 1. It remains an annular gap between the inner wall of the monopole 1 and the second closure lid 11. The annular gap may account for at ⁇ play, less than 5% of the internal cross-sectional area of the monopile. 1 In the pressure medium 1, a monopile Ver ⁇ reduction of the volume flow, which may escape through the seafloor 3, which is approximately proportional to the reduction of the cross-sectional area through the second lid closure 11 is given by the second lid closure. 11
  • the annular gap formed between the second lid closure 11 and the inner wall of the monopile can for example also be closed by a labyrinth seal or a lip seal which releases a part of the annular gap when pressure is applied.
  • a disc-shaped lid closure may be provided as a flow restrictor in the context of the present invention, a one-sided or double-sided closed cylinder.
  • This cylinder is advantageously self-centering within the monopile 1, ie. floating, arranged.
  • the centering when pressure medium is applied for example, be supported by the fact that a surface profile is provided on the outer circumferential surface of the cylinder.
  • the cylinder may be provided with a circumferential lip seal or labyrinth seal.
  • the flow restrictor can be placed either during the installation of Monopile 1 or immediately before its extraction.
  • One or more pumps or compressors for generating the required pressure for the pressure medium can be installed on the first lid closure 5 of the monopile 1. In this way, the distance between the installations required for the pressure medium injection and a connection to the upper seal of the monopile 1 remains constant during the extraction process.
  • One or more flexible connecting hoses can be dispensed with. LIST OF REFERENCE NUMBERS

Landscapes

  • Engineering & Computer Science (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)
  • Structural Engineering (AREA)
  • Foundations (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

L'invention concerne un procédé de démantèlement de structures de fondation en mer comprenant au moins un pieux creux qui est enfoncé par son extrémité de guidage ouverte dans le sous-sol de la mer de manière à entourer la terre. Le pieux creux est extrait de manière hydraulique et/ou pneumatique et le procédé comporte en particulier l'extraction d'un monopieu (1) en tant que pieu creux.
PCT/EP2017/079009 2016-11-16 2017-11-13 Procédé de démantèlement de structures de fondation en mer Ceased WO2018091395A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17797159.5A EP3542000B1 (fr) 2016-11-16 2017-11-13 Procédé de démantèlement de structures de fondation en mer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016222601.0 2016-11-16
DE102016222601.0A DE102016222601A1 (de) 2016-11-16 2016-11-16 Verfahren zum Rückbau von Offshore-Gründungsstrukturen

Publications (1)

Publication Number Publication Date
WO2018091395A1 true WO2018091395A1 (fr) 2018-05-24

Family

ID=60293978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/079009 Ceased WO2018091395A1 (fr) 2016-11-16 2017-11-13 Procédé de démantèlement de structures de fondation en mer

Country Status (3)

Country Link
EP (1) EP3542000B1 (fr)
DE (1) DE102016222601A1 (fr)
WO (1) WO2018091395A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118326968B (zh) * 2024-06-14 2024-08-20 国网安徽省电力有限公司宿州供电公司 一种电力工程用地锚拆除机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1014036B (de) * 1955-07-12 1957-08-14 Mannesmann Ag Verfahren zum Loesen gerammter Stahlrohrpfaehle
US5704732A (en) 1995-11-29 1998-01-06 Deep Oil Technology Incorporated Deep water piling and method of installing or removing
KR20060079446A (ko) 2004-12-31 2006-07-06 재현토건(주) 파일의 인발저항력 저감장치 및 이를 이용한 파일인발방법
US7090434B1 (en) * 2005-05-03 2006-08-15 Cross Rentals, Inc. Caisson removal process
GB2450339A (en) 2007-06-19 2008-12-24 Nuttall Ltd Edmund Removing hollow piles from the ground using fluid pressure
CN204475337U (zh) 2015-02-09 2015-07-15 张继红 一种孔压反力钢管桩拔桩装置
CN204898670U (zh) 2015-08-09 2015-12-23 张继红 一种孔压反力钢管桩拔桩装置与清土装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148206A (en) * 1975-06-13 1976-12-20 Kensetsu Kikai Chiyousa Kk Method of and apparatus for retracting steellpipe pile
JPS59130919A (ja) * 1983-01-17 1984-07-27 Okumura Constr Co Ltd 既設中空杭の撤去方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1014036B (de) * 1955-07-12 1957-08-14 Mannesmann Ag Verfahren zum Loesen gerammter Stahlrohrpfaehle
US5704732A (en) 1995-11-29 1998-01-06 Deep Oil Technology Incorporated Deep water piling and method of installing or removing
KR20060079446A (ko) 2004-12-31 2006-07-06 재현토건(주) 파일의 인발저항력 저감장치 및 이를 이용한 파일인발방법
US7090434B1 (en) * 2005-05-03 2006-08-15 Cross Rentals, Inc. Caisson removal process
GB2450339A (en) 2007-06-19 2008-12-24 Nuttall Ltd Edmund Removing hollow piles from the ground using fluid pressure
CN204475337U (zh) 2015-02-09 2015-07-15 张继红 一种孔压反力钢管桩拔桩装置
CN204898670U (zh) 2015-08-09 2015-12-23 张继红 一种孔压反力钢管桩拔桩装置与清土装置

Also Published As

Publication number Publication date
EP3542000B1 (fr) 2022-06-01
DE102016222601A1 (de) 2018-05-17
EP3542000A1 (fr) 2019-09-25

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