EP2955278B1 - Rauschunterdrückungsvorrichtung - Google Patents

Rauschunterdrückungsvorrichtung Download PDF

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Publication number
EP2955278B1
EP2955278B1 EP14172411.2A EP14172411A EP2955278B1 EP 2955278 B1 EP2955278 B1 EP 2955278B1 EP 14172411 A EP14172411 A EP 14172411A EP 2955278 B1 EP2955278 B1 EP 2955278B1
Authority
EP
European Patent Office
Prior art keywords
vibration damping
damping member
support pile
pile
noise suppression
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.)
Not-in-force
Application number
EP14172411.2A
Other languages
English (en)
French (fr)
Other versions
EP2955278A1 (de
Inventor
Colin Pearce
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.)
Quiet Pile Ltd
Original Assignee
Quiet Pile 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
Application filed by Quiet Pile Ltd filed Critical Quiet Pile Ltd
Priority to EP14172411.2A priority Critical patent/EP2955278B1/de
Publication of EP2955278A1 publication Critical patent/EP2955278A1/de
Application granted granted Critical
Publication of EP2955278B1 publication Critical patent/EP2955278B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/005—Sound absorbing accessories in piling

Definitions

  • the present invention relates to an apparatus and method for noise suppression during driving of support piles, and relates particularly, but not exclusively, to an apparatus for noise suppression during driving of support piles of an offshore wind turbine into the seabed.
  • Installation of offshore wind turbines is typically carried out by gradually hammering a large monopile (generally 5 meters to 7 meters in diameter) into the seabed until it forms a solid support base or foundation on which to install a wind turbine generator.
  • the hammering or piling operation generates large amounts of emitted energy, generally in the form of sound energy propagated into the local environment, which can cause harm to marine animals.
  • Bubble curtains have been used in an attempt to alleviate this problem. These entail the deploying one or more perforated hoses around the pile and/or the ship. Air under pressure is then pumped through the hoses causing a large number of bubbles of air to escape the perforations in the hose.
  • Cofferdams have also been used in an attempt to alleviate the problem.
  • a cofferdam comprises a cylinder taller than the water depth and at least 1m wider than the monopile on a supporting frame. It is lowered to the seabed, generally penetrating a short distance in the sea bed to form a seal, with its top above the waves. Water is then pumped out from the cofferdam prior to a pile being inserted within it. Piling of the monopile is then undertaken in 'dry' conditions with an air gap between the monopile and the cofferdam, thereby generating noise in air, the noise being poorly transmitted through the cofferdam into the surrounding water.
  • isolation casings which are generally a casing around the piling operation comprising one or more shells. Between adjacent shells air or sound absorbing material can be inserted to create a high impedance barrier to noise transmission.
  • an additional air bubble release systems (similar to the bubble curtain discussed above) can be introduced to create further noise mitigation.
  • this arrangement suffers from the disadvantage that these systems are very heavy (sometimes heavier than the monopole itself), particularly where multiple skins are involved. As a result, 2 additional heavy lifts per installation are required, with attendant risks and costs.
  • the systems are also generally very expensive, and the additional time (and thus vessel cost) required for their use is significant. Also, many installation vessels may not be able to lift and/or manoeuvre these devices, and thus their operations severely restrict vessel choice and thus increase costs. Furthermore, each monopile diameter will require a different size casing.
  • Preferred embodiments of the present invention seek to overcome one or more of the above disadvantages of the prior art.
  • a noise suppression apparatus for suppressing noise during driving of at least one support pile of an offshore structure into the seabed, the noise suppression apparatus comprising at least one first vibration damping member adapted to be mounted to at least one support pile of an offshore structure and to at least partially attenuate transmission of vibrations generated in said support pile, as a result of hammering of said support pile into the seabed, through water adjacent said support pile.
  • At least one first vibration damping member adapted to be mounted to at least one support pile of an offshore structure and to at least partially attenuate transmission of vibrations generated in the support pile, as a result of hammering of the support pile into the seabed, through water adjacent the support pile, this provides the advantage of providing a more cost effective system which is much easier to install and handle, minimises delay in piling operations or handling, and does not require power or air supply or an additional boat for deployment.
  • At least one said first vibration damping member may be adapted to at least partially attenuate transmission of vibrations when in contact with a surface of at least one said support pile.
  • At least one said first vibration damping member may include at least one respective inflatable member.
  • At least one said first vibration damping member may be adapted to be brought into contact with a surface of at least one said pile by means of inflation of at least one said inflatable member.
  • the apparatus may further comprise constraining means for limiting expansion of at least one said inflatable member.
  • This provides the advantage of enabling the apparatus to withstand higher inflation pressures.
  • the constraining means may comprise at least one flexible member adapted to be brought into engagement with a said support pile by means of inflation of at least one said inflatable member.
  • the apparatus may further comprise fluid flow control means for controlling flow of fluid into and/or out of the interior of said support pile.
  • This provides the advantage of enabling the amount of water in the interior of the support pile to be controlled, thereby enabling the resonant frequencies damped by the apparatus to be adjusted.
  • the fluid flow control means may comprise at least one valve.
  • At least one said first vibration damping member may be adapted to allow air to escape therefrom.
  • At least one said first vibration damping member may have at least one air outlet for allowing adjustable quantities of air to escape therefrom.
  • At least one said first vibration damping member may be adapted to engage an external surface of at least one said support pile.
  • At least one said first vibration damping member may be adapted to engage an internal surface of at least one said support pile.
  • the apparatus may further comprise a plurality of said first vibration damping members and at least one second vibration damping member adapted to be mounted to a pair of said first vibration damping members.
  • At least one said second vibration damping member may comprise at least one sheet of material.
  • At least one said second vibration damping member may comprise at least one pair of sheets of material for receiving air therebetween.
  • a noise suppression apparatus 2 of a first embodiment of the present invention is mounted to an internal surface 4 of a support pile 6 for an offshore wind turbine (not shown) to attenuate transmission of vibrations, generated as the pile 6 is driven into the seabed (not shown) through the water surrounding the pile 6.
  • the noise suppression apparatus 2 comprises a generally cylindrical body 8 containing a rigid framework 10 of square cross section and a plurality of horizontally arranged first vibration damping members 12 arranged horizontally around the circumference of the cylindrical body and vertically arranged first vibration damping members 14.
  • Each of the first vibration damping members 12, 14 is mounted to the external surface of the cylindrical body 8 and has constraining means in the form of a rigid steel housing 16 forming a gap 18, and a flexible member 20 of durable resilient material located in the gap 18 and which can be urged into engagement with the internal surface 4 of the pile 6 by means of inflation of an inflatable member in the form of an inflatable inner tube 22 arranged between the flexible member 20 and the rigid housing 16.
  • This enables the first vibration damping members 12, 14 to withstand higher inflation pressures than would be the case if the inner tube 22 was not constrained.
  • Such flexible member 20 may be comprised of material(s) which themselves have sound absorbing qualities.
  • Such inflatable inner tube 22 may be inflated with air, other gas, liquid or liquid foam to further enhance its noise suppression qualities.
  • the first vibration damping members 12, 14 are shown in various stages from the uninflated condition at the top of Figure 2 to the fully inflated condition at the bottom of Figure 2 .
  • Wheels 24 are provided for engaging the inner wall 4 of the pile 6 when the vibration damping members 12, 14 are in their uninflated condition, and are prevented from coming into engagement with the inner surface 4 of the pile 6 when the vibration damping members 12, 14 are in their fully inflated condition.
  • a second embodiment of a first vibration damping member 26 is shown in Figures 9 and 10 .
  • the housing 28 of the vibration damping member 26 in Figures 9 and 10 includes three metal body members 30 hinged together so that differences in diameter of the cylindrical body 8 can be accommodated, from the smaller diameter body 8 as shown in Figure 9 to the larger diameter body 8 as shown in Figure 10 .
  • a resilient rubber mount 32 is located between the metal body members 30 and the outer surface of the cylindrical body 8 to accommodate differences in curvature between the outer surface of the cylindrical body 8 and the adjacent surfaces of the metal body members 30.
  • a noise suppression apparatus 102 of a second embodiment of the present invention is shown in Figures 11 and 12 , in which part common to the embodiment of Figures 1 to 10 are denoted by like reference numerals but increased by 100.
  • the cylindrical body 108 of the noise suppression apparatus 102 supports first vibration damping members 112 and is provided with a top plate 134 having a hole or valve 136 to allow controlled flow of air and/or water through the monopile 6 as it is installed in the seabed. In this way, the weight or buoyancy of the monopile 6 in water can be controlled, as a result of which the pile dominant frequency can be adjusted to enable resonant peaks to be avoided.
  • a noise suppression apparatus 202 of a third embodiment of the present invention in which parts common to the embodiment of Figures 1 to 10 are denoted by like reference numerals but increased by 200, includes first noise suppression members 212 which can be brought into engagement with the inner surface 4 of the pile 6 (four viscoelastic rings 4 are shown in Figure 3 ) and outer inflatable viscoelastic rings 138 which can be brought into engagement with an outersurface 7 of the pile 6.
  • the external viscoelastic rings 138 are connected together by second noise suppression members in the form of pairs of sheets 140 of material having apertures allowing air bubbles 142 to pass therethrough, and weights 144 are attached to the lowermost external viscoelastic ring 138
  • the pile 6 In order to install the pile 6 to provide a support for an offshore wind turbine generator (not shown), the pile 6 is supported by a crane (not shown) and maneuvered by means of a manipulator arm (not shown) to its desired position over the seabed. An anvil 146 is then located in position at the top of the pile 6 and the pile 6 is hammered into the seabed by means of a suitable hammering apparatus (not shown). As the pile 6 is hammered into the seabed, transmission of noise through the water is suppressed by the noise suppression apparatus 202.

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)
  • Wind Motors (AREA)
  • Foundations (AREA)

Claims (15)

  1. Rauschunterdrückungsvorrichtung (2) zur Rauschunterdrückung während des Rammens von wenigstens einem Stützpfahl (6) einer Offshore-Konstruktion in den Meeresboden, wobei die Rauschunterdrückungsvorrichtung (2) wenigstens ein erstes Vibrationsdämpfungselement (12) aufweist, das zur Anbringung an wenigstens einem Stützpfahl (6) einer Offshore-Konstruktion und zum wenigstens teilweisen Dämpfen der Übertragung von Vibrationen, die in dem genannten Stützpfahl (6) infolge von Hämmern des genannten Stützpfahls (6) in den Meeresboden erzeugt werden, durch an den genannten Stützpfahl angrenzendes Wasser ausgeführt ist.
  2. Vorrichtung nach Anspruch 1, wobei wenigstens ein genanntes erstes Vibrationsdämpfungselement ausgeführt ist, um die Übertragung von Vibrationen wenigstens teilweise abzuschwächen, wenn es mit einer Oberfläche von wenigstens einem genannten Stützpfahl in Kontakt ist.
  3. Vorrichtung nach Anspruch 1 oder 2, wobei wenigstens ein genanntes erstes Vibrationsdämpfungselement wenigsten ein jeweiliges aufblähbares Element beinhaltet.
  4. Vorrichtung nach Anspruch 3, wobei wenigstens ein genanntes erste Vibrationsdämpfungselement ausgeführt ist, um durch Aufblähen des wenigstens einen genannten aufblähbaren Elements mit einer Oberfläche von wenigstens einem genannten Pfahl in Kontakt gebracht zu werden.
  5. Vorrichtung nach Anspruch 3 oder 4, das ferner ein Beschränkungsmittel zur Begrenzung der Ausdehnung von wenigstens einem genannten aufblähbaren Element aufweist.
  6. Vorrichtung nach Anspruch 5, wobei das Beschränkungsmittel wenigstens ein flexibles Element aufweist, das ausgeführt ist, um durch Aufblähen von wenigstens einem genannten aufblähbaren Element mit einem genannten Stützpfahl in Eingriff gebracht zu werden.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, die ferner einen Fluiddurchflussregler zum Regeln des Fluidflusses in das und/oder aus dem Innere(n) des genannten Stützpfahls aufweist.
  8. Vorrichtung nach Anspruch 7, wobei der Fluiddurchflussregler wenigstens ein Ventil aufweist.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei wenigstens ein genanntes erstes Vibrationsdämpfungselement ausgeführt ist, um Luft daraus entweichen zu lassen.
  10. Vorrichtung nach Anspruch 9, wobei wenigstens ein genanntes erstes Vibrationsdämpfungselement wenigstens einen Luftauslass hat, um einstellbare Luftmengen daraus entweichen zu lassen.
  11. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei wenigstens ein genanntes erstes Vibrationsdämpfungselement ausgeführt ist, um mit einer Außenfläche von wenigstens einem genannten Stützpfahl in Eingriff zu sein.
  12. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei wenigstens ein genanntes erstes Vibrationsdämpfungselement ausgeführt ist, um mit einer Innenfläche von wenigstens einem genannten Stützpfahl in Eingriff zu sein.
  13. Vorrichtung nach einem der vorhergehenden Ansprüche, die ferner mehrere genannte erste Vibrationsdämpfungselemente und wenigstens ein zweites Vibrationsdämpfungselement, das ausgeführt ist, um an einem Paar der genannten ersten Vibrationsdämpfungselemente montiert zu sein, aufweist.
  14. Vorrichtung nach Anspruch 13, wobei wenigstens ein genanntes zweites Vibrationsdämpfungselement wenigstens ein Materialflächengebilde aufweist.
  15. Vorrichtung nach Anspruch 14, wobei wenigstens ein genanntes zweites Schwingungsdämpfungselement wenigstens ein Paar Materialflächengebilde zur Aufnahme von Luft zwischen ihnen aufweist.
EP14172411.2A 2014-06-13 2014-06-13 Rauschunterdrückungsvorrichtung Not-in-force EP2955278B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14172411.2A EP2955278B1 (de) 2014-06-13 2014-06-13 Rauschunterdrückungsvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14172411.2A EP2955278B1 (de) 2014-06-13 2014-06-13 Rauschunterdrückungsvorrichtung

Publications (2)

Publication Number Publication Date
EP2955278A1 EP2955278A1 (de) 2015-12-16
EP2955278B1 true EP2955278B1 (de) 2016-07-13

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EP14172411.2A Not-in-force EP2955278B1 (de) 2014-06-13 2014-06-13 Rauschunterdrückungsvorrichtung

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2003073C2 (nl) * 2009-06-23 2010-12-27 Ihc Holland Ie Bv Inrichting en werkwijze voor het reduceren van geluid.
WO2011128490A1 (en) * 2010-04-16 2011-10-20 Junttan Oy A hammer for a pile-driving machine
DK2831342T3 (en) * 2012-03-26 2018-08-27 Elmer Karl Heinz PROCEDURE FOR HANDLING A HYDRAULIC SILENCER AND DEVICE NOISE REDUCTION

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EP2955278A1 (de) 2015-12-16

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