NL2010548C2 - Pile noise barrier and method for installing the pile noise barrier to obtain a noise reduction during an offshore ramming operation. - Google Patents

Pile noise barrier and method for installing the pile noise barrier to obtain a noise reduction during an offshore ramming operation. Download PDF

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Publication number
NL2010548C2
NL2010548C2 NL2010548A NL2010548A NL2010548C2 NL 2010548 C2 NL2010548 C2 NL 2010548C2 NL 2010548 A NL2010548 A NL 2010548A NL 2010548 A NL2010548 A NL 2010548A NL 2010548 C2 NL2010548 C2 NL 2010548C2
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Netherlands
Prior art keywords
pile
foundation pile
screen
sound barrier
barrier
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Application number
NL2010548A
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Dutch (nl)
Inventor
Anthonius Johannes Maria Keuzenkamp
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Ballast Nedam Offshore B V
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Application filed by Ballast Nedam Offshore B V filed Critical Ballast Nedam Offshore B V
Priority to NL2010548A priority Critical patent/NL2010548C2/en
Application granted granted Critical
Publication of NL2010548C2 publication Critical patent/NL2010548C2/en

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    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02—Placing by driving
    • E02D7/06—Power-driven drivers
    • E02D7/14—Components for drivers inasmuch as not specially for a specific driver construction

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  • 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)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Description

Title: Pile noise barrier and method for installing the pile noise barrier to obtain a noise reduction during an offshore ramming operation.
The present invention relates to a method for installing a pile noise barrier for achieving a noise reduction during an offshore pile ramming operation. Further, the invention relates to a pile noise barrier for reducing noise during an offshore pile ramming operation and use of the pile noise barrier in the method according to the invention.
WO2011/046430 discloses such a method for installing a pile noise barrier. The pile noise barrier comprises a noise-insulating pipe which includes a number of telescopically extendable and retractable pipe sections. The pipe is provided with buoyancy so that it can float in a body of water. A pile element may be arranged in the pipe which can subsequently be driven into the water bottom by means of a pile-driving device. In a starting position the pipe sections are fixed with respect to each other, so that the pipe sections remain retracted while floating in the water. At a certain point in time, the fixation of the pipe sections with respect to one another is released, so that the pipes can move with respect to one another. In a final position, the pipe sections are extended until they reach the water bottom and the pile noise barrier is placed onto the water bottom. The pile noise barrier is subsequently anchored at its position and a ramming operation may start.
A drawback to the disclosed method for installing a pile noise barrier is that the complete installation of the pile and pile noise barrier is inefficient.
EP1.640.508 discloses a pile guiding device for guiding a pile. The pile guiding device has a pile guiding frame for engaging around and guiding the pile during a ramming operation. The pile guiding frame is fixed in a supporting arrangement like a ship's jack up platform. The pile guiding frame is provided with a bubble curtain arrangement which serves as a noise barrier. The bubble curtain arrangement comprises a blowing device with a nozzle arrangement for blowing air bubbles. The nozzle arrangement is suspended in an upper position to the pile guiding frame. The nozzle arrangement surrounds the pile to be rammed into the water bottom. In a preparing step before the ramming operation, the pile guiding device holds a pile and the nozzle arrangement is lowered to the water bottom. The pile in the guiding device guides the nozzle arrangement during its lowering. The nozzle arrangement is lowered along the pile which is held by the pipe guiding frame to the water bottom to reach a working position. After the placement of the nozzle arrangement on the water bottom, the blowing device is switched on to start the discharge of air bubbles and the ramming operation may start.
A drawback to the bubble curtain arrangement which is suspended to the pile guiding frame is that the operational time for installing the bubble curtain arrangement is upholding the ramming operations.
The main object of the present invention is to at least partially eliminate the above mentioned drawbacks and/or to provide a useable alternative. More specific, it is an object of the invention to reduce a total operational time for installing a pile by providing a method for installing a noise pile barrier in an efficient way. Further, it is an object of the invention to provide a collapsible pile noise barrier which can be handled and installed easily.
This object is achieved by a method for installing a pile noise barrier according to claim 1. In the method, the pile noise barrier is installed to achieve a noise reduction during an offshore pile ramming operation. During the ramming operation, vibrations are conducted via the pile and are introduced into the water body which surrounds the pile. The ramming vibrations are harmful for sealife and need to be strongly reduced. The pile noise barrier is a pile equipment which circumvents a single pile or a group of piles during ramming. The pile noise barrier has a hollow cylindrical shape, wherein at least one pile can be placed inside the hollow cylindrical shape. The hollow cylindrical shape is formed by a cylindrical barrier wall. The pile noise barrier can be used for introducing a monopile or a group of smaller piles to install e.g. a tripod or jacket foundation structure. The hollow cylindrical shape provides a pile passageway for a feed through of a pile through the pile noise barrier into the water bottom. The barrier wall forms a barrier to obtain a reduction of transfer of ramming vibrations through the water body.
According to the invention, the method comprises a step of allocating a position for introducing at least one pile into a water bottom of a water body. The position may mark a location for introducing a single pile, e.g. a monopile, or a group of piles, e.g. a set of three piles for installing a tripod foundation structure.
In a step of the method a pile noise barrier is provided for reducing ramming noise during an offshore ramming operation at the allocated position.
According to the invention a collapsible pile noise barrier is provided. The collapsible pile noise barrier is transformable from a compact configuration to an extended configuration. The collapsible pile noise barrier has a barrier wall, also called screen, which is operatable in between the compact configuration and an extended configuration by an extension unit. In the compact configuration of the pile noise barrier, the pile noise barrier is manoeuvrable to transport the pile noise barrier at the allocated position. In the extended configuration the pile noise barrier is arranged to reduce noise during ramming.
In a step of the method according to the invention, the pile noise barrier is sunk down to the water bottom of the water body. The pile noise barrier is lowered to the water bottom in the compact configuration. The pile noise barrier reaches the water bottom in the compact configuration. The pile passageway of the pile noise barrier is positioned at the allocated position for introducing the single pile or group of piles.
In a step of the method according to the invention, at least one pile is provided which has to be introduced in the water bottom at the allocated position. In particular, the pile to be introduced is a mono pile which serves as a foundation for a windturbine. The pile to be introduced has an elongated pile body including a proximal pile end and a distal pile end. In particular, the pile has a cylindrical shape with a constant diameter. The pile as a mono pile for a windturbine may have a diameter of at least 4m and a length of at least 20m. A pile for installing a tripod or jacket foundation structure may have a diameter of at least 1.5m and a length of at least 10m.
In a step of the method according to the invention, the distal end of the pile body is positioned at the allocated position at the water bottom. The pile is brought and kept in an upstanding position. The distal end of the pile body is positioned at the passageway of the pile noise barrier, such that the pile can be fed through the passageway of the pile noise barrier at the allocated position.
In a step of the method according to the invention, the pile noise barrier is situated at the water bottom and subsequently extended from the compact configuration to the extended configuration. A noise barrier is erected from the water bottom to the water surface of the water body. After the extension of the noise barrier, the pile is circumvented by the pile noise barrier. After the extension of the pile noise barrier into the extended configuration, the ramming operation may start. Ramming vibrations are at least partly absorbed by the pile noise barrier and at least partly prevented from a further transfer through the water body.
Advantageously, the pile noise barrier is erected from the water bottom to the water surface after positioning the pile noise barrier and pile at the allocated position. In this way, the pile noise barrier is hardly an obstacle for handling and positioning the pile. The pile noise barrier remains in a compact configuration during the handling of the pile noise barrier itself which in the first place contributes to a convenient and accurate positioning of the pile noise barrier at the water bottom. The compact configuration of the pile noise barrier is maintained during the placement of the pile which in the second place contributes to a convenient placement of the pile. An available free space in the water body above the pile noise barrier may permit the pile to be handled easily to bring the pile in an upstanding position above the pile noise barrier. Subsequently, the pile can be lowered in the upstanding position to feed the pile through the pile passageway of the pile noise barrier. Additionally, due to the compact configuration of the pile noise barrier at the water bottom, a passing height of the pile passageway is limited which makes the feed through of the pile less susceptible to damages and misalignments. A risk on a failure during placement of the pile in the pile passageway of the pile noise barrier is reduced. In particular, bad weather circumstances and heave motion does have less influence on a proper positioning of the pile. Advantageously, the method according to the invention can still be carried out under severe heave motion or strong currents.
In an embodiment of the method according to the invention, the pile noise barrier and the pile are positioned in successive steps. In a first step, the pile noise barrier is positioned at the water bottom at the allocated position. The at least one pile and pile noise barrier can be brought to the allocated position at a water bottom in a separate steps. A barrier-vessel may be used in which the barrier-vessel is dedicated to the transport of the pile noise barrier to the allocated position. After placement of the pile noise barrier at the water bottom, the pile is placed. The pile may be transported to the allocated position in a horizontal manner and finally brought in an upstanding position when reaching the allocated position. A pile-vessel may be used in which the pile-vessel is dedicated to the transport, handling and guiding of the pile. To position the pile at the allocated position, the distal end of the pile is pointed to the pile passageway of the pile noise barrier at the water bottom. The pile can be lowered and fed through the pile passageway of the pile noise barrier to pitch into the water bottom. After placement of the pile, the pile noise barrier can be operated to extend from the compact configuration to the extended configuration. During a rising of a noise barrier portion of the pile noise barrier, the pile may guide the noise barrier portion.
It is from a logistic point of view advantageous to position the pile noise barrier and pile in separate steps. An allocated position may be provided with a pile noise barrier in a step before positioning the pile at that allocated position. The pile noise barrier may be lowered and positioned at the water bottom by a barrier-vessel, while the pile may be positioned by a pile-vessel having a large hoisting capacity. The pile-vessel is equipped with a pile handling system, like a pile guiding device for transport, positioning and guiding of piles. Regarding a total operation, it is advantageous to use the capital pile-vessel solely for handling of piles and use a separate barrier-vessel to handle a pile noise barrier. In the method according to the invention, the pile-vessel can directly be used for handling a next pile after finishing a ramming operation. A barrier-vessel can be used in parallel to remove the pile noise barrier from the just introduced pile and position the pile noise barrier at a next allocated position. In operation several pile noise barriers may be available at a working area to install a plurality of piles. Herewith, an operational efficiency of an installation of a pile noise barrier and subsequent introduction of a pile can be increased.
In an embodiment of the method according to the invention the pile noise barrier and the pile are lowered simultaneously to the water bottom of the water body. In a preparing step, the pile noise barrier is connected to a distal end of the pile. The pile is fed through the pile passageway in a preparing step of assembling the pile noise barrier to the pile. The pile noise barrier and the distal end of the pile are positioned at the allocated position in one step. The pile noise barrier is handled together with the pile. The pile noise barrier moves together with the pile. The pile noise barrier is lowered in a compact configuration together with the pile distal end to the water bottom. After reaching the water bottom, the pile noise barrier is transformed from a compact configuration to the extended configuration. The noise barrier portion of the pile noise barrier is extended along the pile after placement of the pile noise barrier at the water bottom. The noise barrier portion is extended from the water bottom to the water surface. After installation of the pile noise barrier, the ramming operation may start. After completing the ramming operation, the pile noise barrier can be removed from the pile and can be reused again for a next pile. Advantageously, the simultaneous positioning of the distal end of the pile together with the pile noise barrier may prevent problems in feeding the pile through the pile passageway of the pile noise barrier. The feeding of the pile through the pile passageway of the pile noise barrier is performed at the water surface instead of at the allocated position at the water bottom which may provide better circumstances for handling.
In an embodiment of the method according to the invention, the method further comprises a step of starting and completing a pile ramming operation. The pile is rammed into the water bottom by a pile ramming device. The pile ramming device is connected to the proximal end of the pile. During the ramming operation, the pile noise barrier is maintained in the extended configuration to provide a noise reduction. After the ramming operation, the method comprises the step of collapsing the pile noise barrier to the compact configuration. The pile noise barrier is returned to its initial compact configuration. To remove the pile noise barrier from the pile, the method comprises a step of lifting the pile noise barrier to the proximal end of the pile. The pile noise barrier is lifted to the water surface of the water body. In particular, the barrier wall of the pile noise barrier may have a circumferentially closed cylindrical shape, such that the pile noise barrier is removed from the pile by lifting the pile noise barrier above the pile.
In an alternative embodiment of the method according to the invention, the pile noise barrier may be openable at its outer circumference for a radial removal of the pile noise barrier from the pile. The pile noise barrier may have a barrier wall which can be opened to provide a sidewardly directed passageway for the rammed pile. The barrier wall may include a movable barrier wall portion which can be moved, in particular pivoted, to and fro an open position and a closed position. The barrier wall may include a barrier wall separation which can be opened or closed. The barrier wall may comprise a first and second barrier wall portion which may be moved towards and away from each other to create an open or closed barrier wall separation. After opening the barrier wall, the pile noise barrier can be removed from the rammed pile by moving the pile noise barrier in a sidewards direction, such that the pile passes through the passageway of the barrier wall.
In an embodiment of the method according to the invention, the pile noise barrier has an inflatable screen as a barrier wall. The inflatable screen may at least partially be maintained in an inflated condition when sidewardly removing the pile noise barrier from the pile.The at least partially inflated screen may exert a lifting force, which may compensate a ballast weight during a displacement of the pile noise barrier from a first to a second pile. Advantageously, this may contribute to a convenient displacement of the pile noise barrier.
In an embodiment of the method according to the invention, the provided collapsible pile noise barrier comprises a flexible noise barrier portion. The noise barrier portion is flexible in that the noise barrier portion is deformable from a first shape in a compact configuration to a second shape in an extended configuration. In particular, the pile noise barrier comprises an inflatable screen as a flexible noise barrier portion. The inflatable screen comprises at least one gas compartment which can be pressurised to inflate the screen and extend the screen to the extended configuration. The at least one gas compartment is substantially airtight. The at least one gas compartment comprises a valve to connect the gas compartment to an extension unit which comprises a blowing device.
Further preferred embodiments are defined in the subclaims.
Further, the invention relates to a pile noise barrier for reducing noise during an offshore pile ramming operation.
According to the invention, the pile noise barrier comprises a ballast element for providing a ballast weight for sinking down the pile noise barrier to a water bottom of a water body. The ballast weight is further provided to keep the pile noise barrier at the water bottom. Further, the pile noise barrier comprises at least one collapsible screen. The screen comprises a screen body including a free screen end and a fixed screen end. The fixed screen end is connected to the ballast element. The collapsible screen is extendable in an axial direction of the pile noise barrier from a compact configuration to an extended configuration. Further, the pile noise barrier comprises an extension unit for operating the collapsible screen from the compact configuration to the extended configuration.
The pile noise barrier according to the invention is improved in that the collapsible screen is an inflatable screen. The inflatable screen is operatable in between the compact configuration and the extended configuration by inflation. The extension unit comprises a blowing device for pressurising the inflatable screen. The blowing device is fluidly connected to the inflatable screen. Preferably, the blowing device is fluidly connected to a lower region of the inflatable screen. The inflatable screen comprises at least one gas compartment which is substantially airtight. At least one gas compartment can be inflated to obtain the extended configuration of the screen and deflated to return the screen to the compact configuration. The inflatable screen is flexible, such that the screen is deformable from the compact configuration to the extended configuration. When deflated, the screen deforms from an erected configuration to a lay down configuration. The screen may comprise a flexible bendable construction created from a flexible material like a rubber to easily collapse under gravity into the compact configuration.
Advantageously, the inflatable screen provides a noise barrier portion which can be extended quickly and easily from the compact configuration to the extended configuration. Additionally, in comparison with a noise barrier portion out of several rigid coupled screen sections, like telescopic screen sections, the inflatable screen may have less noise transfer at the coupling locations in between the sections.
In particular, the pile noise barrier according to the invention is used in the method for installing a pile noise barrier according to the invention. The inflatable screen is suitable to be guided by the pile when being extended. The inflatable screen is flexible which reduces a risk on damages to the pile or to the inflatable screen when the inflatable screen is extended.
In an embodiment of the pile noise barrier according to the invention, the pile noise barrier comprises a pull down system for pulling down a screen from the extended configuration to the compact configuration. The pull down screen comprises at least one winding device including at least one cable. Each proximal end of the at least one cable is connected to the winding device for winding the cable. A distal end of the at least one cable is connected to the free end of the screen. The at least one cable extends from the ballast element to the free end of the screen. Preferably, the cable is looped at the ballast element and the winding device is positioned at an upper region of the pile noise barrier. The at least one cable extends from the winding device towards the ballast element and returns towards the free end of the screen. In use, the winding device may be situated above water level. Preferably, at least three cables are provided and preferably equally spaced along an circumference of the screen. The at least three cables are arranged in parallel. By winding the at least three cables, a pulling force may be exerted and the screen may be pulled down. In particular, in a water body having strong currents, it is advantageous to use the pull down system to prevent the screen from sticking to the pile.
In an embodiment of the pile noise barrier according to the invention, the pile noise barrier comprises at least two inflatable screens. The inflatable screens are arranged in parallel. In particular, the pile noise barrier comprises an inner and an outer inflatable screen. The inner and outer screen are positioned substantially concentrically. The inner screen is positioned inside the outer screen.
Advantageously, in comparison with a single screen, the at least two parallel inflatable screens provide a further noise reduction during a ramming operation.
In an embodiment of the pile noise barrier according to the invention the inner and outer inflatable screens are spaced from each other. An intermediate space is provided in between the inner and outer inflatable screen. The intermediate space provides a further reduction of noise during a ramming operation. Preferably, a liquid pump is in fluid communication connected with the intermediate space for pumping liquid out of the intermediate space. Liquid may be discharged from the intermediate space by the liquid pump to at least partially empty the intermediate space. The at least partially emptied intermediate space may advantageously further reduce a noise transfer from the pile to the surrounding water body. Alternatively, liquid may be supplied to the intermediate space to fill the intermediate space with liquid at a water level higher than a water level of the water body. The higher water level in the intermediate space may advantageously keep the inner and outer screen spaced apart.
In an embodiment of the pile noise barrier according to the invention, the pile noise barrier comprises a bubble device including an air pump and a nozzle arrangement for discharging air bubbles at a lower region of the pile noise barrier. The nozzle arrangement is positioned at a lower region of the pile noise barrier. The nozzle arrangement is preferably connected to the ballast element to release air bubbles. Discharged air bubbles will rise from the water bottom to the water surface and form an air curtain. The air curtain extends in parallel with a circumferential surface of a screen of the pile noise barrier. Preferably, the nozzle arrangement is in fluid communication connected with the intermediate space for discharging air bubbles in the intermediate space. The air curtain in the intermediate space advantageously provides a further noise reduction during a ramming operation.
In an embodiment of the pile noise barrier according to the invention, the inflatable screen comprises a plurality of side-by-side positioned inflatable gas compartments. Preferably, the gas compartments are adjacent positioned in the axial direction of the pile noise barrier. In the axial direction of the pile noise barrier, the gas compartments are stacked onto each other. The gas compartments have an elongated compartment body which defines a longitudinal axis. The longitudinal axis of the gas compartment is directed in a circumferential direction. The elongated gas compartment may have a ratio in length/height which is at least a factor two, in particular at least a factor five.
Advantageously, the side-by-side in axial direction stacked gas compartments may provide an inflatable screen which can be inflated in a short time interval. A plurality of gas compartments may be inflated at the same moment. This may further reduce an operational time interval necessary to install the pile noise barrier. When extending the pile noise barrier from the compact to the extended configuration, the gas compartments can be pressurised at different pressure values. Different pressure values can be applied to compensate for different underwater pressures to obtain a substantially constant diameter of the screen.
Gas compartments which are positioned at an upper region of the screen can be pressurised at a lower pressure than gas compartments which are positioned at a lower region of the screen.
In an embodiment of the pile noise barrier according to the invention, the inner and outer inflatable screen include radially neighbouring gas compartments which are fluidly interconnected. Herewith, only an air connection to inflate or deflate a gas compartment may be necessary at one of the screens, preferably only at the outer screen. The inner and outer screen are advantageously inflated or deflated simultaneously.
In an embodiment of the pile noise barrier according to the invention, the screen body comprises a ring-shaped cross-section. The screen body has a hollow longitudinal cylindrical shape. The screen body is hollow by a through hole which forms a pile passageway for feeding through a pile. In use, the screen body is closed in a circumferential direction to fully circumvent a pile to provide a noise barrier along a complete outer surface of the pile.
In an embodiment of the pile noise barrier according to the invention the screen body is arranged for reducing ramming noise when introducing an offshore monopile or a group of piles for installing a tripod or jacket foundation structure to install a windturbine into a water bottom. The screen body may have a pile passageway with a diameter of at least 4m, in particular at least 5m to fit around a monopile having a corresponding outer diameter. The screen body may have a length of at least 10m, in particular at least 20m to be useable in a water body including a corresponding depth.
Further, the invention relates to a use of the pile noise barrier according to the invention in a method according to the invention.
The invention will be explained in more detail with reference to the appended drawings. The drawings show a practical embodiment according to the invention, which may not be interpreted as limiting the scope of the invention. Specific features may also be considered apart from the shown embodiment and may be taken into account in a broader context as a delimiting feature, not only for the shown embodiment but as a common feature for all embodiments falling within the scope of the appended claims, in which:
Fig. 1 shows a perspective view of an inflatable pile noise barrier according to the invention; and
Fig. 2A-2F show in several schematic views successive steps of an embodiment of a method for installing a pile noise barrier at a water bottom of a water body according to the invention.
In the figures, identical reference numbers are used to indicate identical or similar components of a device or method according to the invention.
Figure 1 shows in a schematic perspective view in cross-section a water body W comprising a water bottom WB, in particular a seabed, and a water level WL. A pile 100, in particular an off shore mono pile, is positioned at the water bottom WB. The pile 100 is arranged for installing a windturbine. The mono pile provides a foundation structure for a windturbine. The mono pile may have an outer diameter of at least 4m, in particular at least 5m. The mono pile 100 has an elongated mono pile body 101 including a proximal pile end 102 and a distal pile end 103. The elongated mono pile body 101 may have a length of at least 20m, in particular at least 30m. The distal pile end of the mono pile is introduced in the water bottom WB by a ramming device (not shown). Typically, the mono pile is introduced in the water bottom WB about a length of at least 10m.
The pile 100 is circumvented by a pile noise barrier 10. The pile noise barrier 10 is arranged for reducing noise which occurs during a ramming operation. The pile noise barrier 10 is arranged to provide a barrier against a continuation of vibrations through the water body W which originates from the pile 100. The pile noise barrier is a noise barrier arranged for reducing noise for an individual single mono pile 100.
The pile noise barrier 10 comprises a ballast element 11. The ballast element 11 is positioned at a lower region of the pile noise barrier 10. The ballast element 11 provides a ballast weight to the pile noise barrier to allow the pile noise barrier 10 to sink to a water bottom WB. The ballast element keeps the pile noise barrier in position at the water bottom WB. The ballast element may have a ballast weight of at least 10tons. The ballast element 11 is cylindrical, in particular ring-shaped, and surrounds the pile 100. The ballast element 11 has a circular cross section. The ballast element 11 fully encloses the pile 100. The pile 100 is positioned inside the ring-shaped ballast element 11. The ballast element comprises a through hole as a ballast passageway 110 for a pile 100. A pile 100 can be fed through the passageway 110 to be introduced in the water bottom WB. The passageway 110 of the ballast element 11 has an inner diameter which corresponds to the outer diameter of the pile 100. The diameter of the passageway 110 is larger than the outer diameter of the pile 100.
In particular, the diameter of the passageway 110 is at least 1m larger than the outer diameter of the pile 100 which has to be introduced in the water bottom WB.
Further, the pile noise barrier 10 comprises at least one inflatable screen 12. The inflatable screen has a screen body 120. The screen body 120 is elongated and cylindrically shaped. The screen body has an axial axis in a longitudinal direction. The screen body 120 is ring-shaped. The ring-shaped screen body 120 provides a screen passageway 129 for enabling a pile to pass through the pile noise barrier 10. The screen passageway fully encloses a pile 100. The screen body 120 is closed in a circumferential direction. The screen body 120 has a simple configuration and cannot be opened in a circumferential direction.
The screen passageway 129 is aligned with the ballast passageway 110 of the ballast element. The screen passageway 129 has a diameter which corresponds to the diameter of the passageway 110 of the ballast element 11. The screen body 120 has a free screen end 120a and a fixed screen end 120b. The fixed screen end 120b is connected to the ballast element 11. The free screen end 120a is movable to and fro the ballast element 11.
In a first operational mode, the pile noise barrier 10 has a compact configuration, wherein the at least one inflatable screen 12 is deflated. In a second operational mode, the pile noise barrier has an extended configuration, wherein the at least one inflatable screen 12 is inflated. The pile noise barrier 10 can be transformed from the compact configuration to the extended configuration. During a transformation from the compact configuration to the extended configuration, the at least one screen 12 moves in an axial direction. In the compact configuration, the screen 12 is collapsed and back positioned at the ballast element 11. In the extended configuration, the screen 12 is extended and positioned away from the ballast element 11. In the compact configuration, the pile noise barrier 10 can be handled and transported to a working area. In the extended configuration, the pile noise barrier 10 is in a working mode and a ramming operation may start.
In figure 1, the pile noise barrier 10 comprises two inflatable screens 12.1 and 12.2. The pile noise barrier 10 is a double screen pile noise barrier. The pile noise barrier 10 comprises an inner inflatable screen 12.1 and an outer inflatable screen 12.2. The outer inflatable screen 12.2 surrounds the inner inflatable screen 12.1. The inner and outer inflatable screens 12.1 and 12.2 are coaxially positioned. The inner and outer inflatable screens 12.1 and 12.2 are spaced apart from each other. The pile noise barrier 10 comprises at least one intermediate space 128 in between two neighbouring inflatable screens 12. The intermediate space 128 is provided in between the inner and outer inflatable screens 12.1 and 12.2. The intermediate space 128 may be filled with a liquid or maybe emptied and air filled.
The inflatable screen 12 comprises at least one gas compartment 121. The gas compartments 121 are airtight. The gas compartments 121 can be pressurised with a gas, in particular air. In figure 1, the inflatable screen 12 comprises four gas compartments 121.1, 121.2, 121.3, 121.4. The gas compartiments are in the axial direction stacked on each other. The gas compartments 121 are positioned adjacent to each other in an axial direction. The plurality of gas compartments 121 comprises an elongated compartment body 122 having a longitudinal axis. The compartment body 122 extends in a horizontal direction. The longitudinal axis is directed in a circumferential direction. The compartment body 122 is elongated and has a ratio in length/diameter which is larger than at least two, in particular at least a factor five.
Figures 2A until to 2G show several successive steps of an embodiment of a method for installing a pile noise barrier 10 at a water bottom WB of a water body W according to the invention. The pile noise barrier 10 is installed to achieve a noise reduction during an offshore ramming operation. The pile noise barrier 10 is installed to circumferentially enclose a pile 100. The illustrated pile 100 is a monopile as a foundation structure for a an offshore windturbine, during a ramming operation. The pile 100 may also be a set of piles which can be introduced into the water bottom WB to install a tripod or jacket foundation structure.
In a preparational phase of the method, a position for introducing the pile 100 in the water bottom WB is allocated. The position of the pile 100 to be introduced may be allocated in a planned offshore windfarm. Further, a collapsible pile noise barrier 10 for reducing ramming noise is provided at the allocated position. The pile noise barrier 10 may be transported to the allocated position by a barrier-vessel at the water level WL. The vessel may be provided with a hoisting device to carry the pile noise barrier 10. The collapsible pile noise barrier 10 is an inflatable pile noise barrier 10 as illustrated in figure 1. The pile noise barrier 10 is transported in a compact configuration to the allocated position.
As shown in Fig. 2A, in a first phase of the method according to the invention, the pile noise barrier 10 is lowered to the water bottom WB in the compact configuration. The pile noise barrier 10 is suspended to a floating hoisting device by hoisting cables 111. A distal end of the hoisting cable 111 is connected to the ballast element of the pile noise barrier 10.
As shown in Fig. 2B, the pile noise barrier 10 is sunken down until the ballast element reaches the water bottom WB at the allocated position. At the water bottom WB, the ballast element 11 may be anchored to the water bottom WB by anchor elements. The anchor elements are connected to the ballast element 11. The at least one hoisting cable 111 is provided with a floater 112. At least one floater 112 is connected to the hoisting cables 111. The floater permits the hoisting cables 111 to be released from the hoisting device, such that the working area becomes available for placing a pile 100. The pile 100 can be entered into the working area by a pile-vessel which is arranged to handle a pile. The vessel is for example equipped with a pile guiding device for guiding a pile in an upstanding position.
As shown in Fig. 2C, a pile 100 is pitched through the passageway 110 of the ballast element 11 into the water bottom. The floater which is connected to the hoisting cables 111 indicates the position of the ballast element 11 which makes it easier to direct the distal end of the pile through the passageway of the ballast element 11. During the pitch, the distal end of the pile 103 hits the water bottom WB at a centre region of the ballast element 11 and the pile body 100 sinks several metres into the water bottom WB. The pile noise barrier 10 is still in the compact configuration during the pitching of the pile 100.
Fig. 2D shows two successive steps of the method according to the invention. At first, the two inflatable screens 12.1 and 12.2 are erected into the extended configuration. In the extended configuration, the inflatable screens reach above the water surface WL of the water body. The pile noise barrier 10 extends from the water bottom WB until at least the water level WL of the water body. The inflatable screens 12 are brought into the extended configuration by operating a blowing device 13. The inflatable screen 12 is in fluid communication connected with the blowing device 13. The blowing device 13 is arranged for pressurising the inflatable screen 12. The blowing device 13 comprises a pump and a plurality of air connections to pressurise the plurality of gas compartments of the screen 12. An air stream, indicated by an arrow 131a, is connected to the gas compartments of the screen 12. As illustrated, the air connections are connected to gas compartments of the outer screen 12.2, in which the gas compartments of the outer screen 12.2 are interconnected and in fluid communication with gas compartments of the inner screen 12.1. By fluidly connecting the inner screen 12.1 to the outer screen 12.2, the amount of air connections can be reduced. One gas compartment completely surrounds the pile such that one connection is sufficient to inflate one horizontal gas compartment.
After the erection of the inflatable screen, a ramming operation is carried out. The pile 100 is introduced into the water bottom WB by ramming the proximal end of the pile 100 by a ramming device. The ramming device may be situated on board of a pile-vessel at the water level WL.
Fig. 2E shows a final phase of the method according to the invention. The ramming operation is completed which means that the at least one pile 100 is introduced at a sufficient depth into the water bottom WB. After finishing the ramming operation, the ramming device may be removed from the proximal end of the pile 100. The pile noise barrier 10 is deflated. An air stream, indicated by the arrow 131b, returns to the blowing device 13. The gas compartments of the screens 12 are emptied and their volume is reduced. The pile noise barrier 10 returns from the extended working configuration to the compact configuration. By deflating the screens 12, the pile noise barrier 10 is collapsed back to its initial compact configuration. A pull down system (not shown) is provided to support the movement of the screen 12 from its extended to its compact configuration.
As shown in Fig. 2F, the pile noise barrier 10 is removed again from the water bottom WB. The pile noise barrier 10 is lifted upwards away from the water bottom WB in the axial direction along the pile 100 to the water level WL. The pile noise barrier 10 is lifted by the hoisting wires cables 111 and the hoisting device on board of the barrier-vessel. The pile noise barrier 10 is lifted above the proximal end of the pile 100 to free the pile noise barrier 10 from the pile 100. Hereafter, the pile noise barrier 10 is ready to be used again for an installation of another pile.
Numerous variants are possible in addition to the embodiment shown.
In a variant on the illustrated pile noise barrier, the pile noise barrier can be arranged with vertically extending gas compartments. The pile noise barrier may have an inner and outer inflatable screen, wherein each screen comprises vertically extending gas compartments. The vertically extending gas compartment may extend in axial direction as a single compartment from the ballast element to the proximal end of the pile noise barrier.
In a variant on the illustrated pile noise barrier, the pile noise barrier may have a single inflatable screen. The single inflatable screen may comprise horizontally extending gas compartments which can be inflated to obtain the extended configuration of the pile noise barrier.
Although the invention has been disclosed with reference to particular embodiments, from reading this description those of skilled in the art may appreciate a change or modification that may be possible from a technical point of view but which will not depart from the scope of the invention as described above and claimed hereafter. Modifications may be made to adapt for a particular situation according to the teachings of the invention without departing from the essential scope thereof. It will be understood by those of skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. Therefore, it is intended that the invention is not limited to the particular embodiments disclosed in the above detailed description, but that the invention will include all embodiments falling within the scope of the appended claims.
Thus, the invention provides a method for installing a pile noise barrier for achieving a noise reduction during an off shore pile ramming operation. Advantageously, the method provides an operational efficiency. Additionally, the present invention provides a collapsible pile noise barrier which is convenient to handle at a working area and to carry out the method according to the invention. This further increases an efficiency of an offshore pile ramming operation.

Claims (19)

1. Werkwijze voor het installeren van een fundatiepaal geluidsbarrière voor het verkrijgen van een geluidsreductie gedurende een offshore hei-operatie omvattende de stappen van: - het lokaliseren van een positie voor het in een waterbodem van een waterlichaam inbrengen van ten minste een fundatiepaal; - het verschaffen van een inklapbare fundatiepaal geluidsbarrière voor het reduceren van hei geluid gedurende een offshore hei-operatie op de gelokaliseerde positie, waarbij de inklapbare fundatiepaal geluidsbarrière een barrièrewand heeft die bedienbaar is tussen een compacte configuratie, waarbij de fundatiepaal geluidsbarrière manoeuvreerbaar is en een uitgestrekte configuratie voor het reduceren van geluid gedurende het heien, waarbij de fundatiepaal geluidsbarrière een fundatiepaal doorgang heeft voor een doorvoer van de ten minste ene fundatiepaal; - het afzinken van de fundatiepaal geluidsbarrière in de compacte configuratie naar de waterbodem en het positioneren van de fundatiepaaldoorgang op de gelokaliseerde positie voor het inbrengen van de fundatiepaal; - het verschaffen van ten minste een fundatiepaal welke in de waterbodem moet worden ingebracht, waarbij ten minste ene fundatiepaal een langwerpig fundatiepaallichaam heeft omvattende een proximaal paaleinde en een distaai paaleinde; - het positioneren van het distale einde van het paallichaam op de waterbodem op de gelokaliseerde positie om de fundatiepaal door de paaldoorgang van de geluidsbarrière door te voeren; - het uitstrekken van de fundatiepaalgeluidsbarrière die op de waterbodem is gepositioneerd vanuit de compacte configuratie naar de uitgestrekte configuratie.Method for installing a sound barrier foundation pile for obtaining a noise reduction during an offshore pile-driving operation comprising the steps of: - locating a position for introducing at least one foundation pile into a water bottom of a body of water; providing a collapsible foundation pile sound barrier for reducing pile sound during an offshore pile operation at the localized position, wherein the collapsible foundation pile sound barrier has a barrier wall that is operable between a compact configuration, wherein the foundation pile sound barrier is maneuverable and an extended configuration for reducing noise during pile-driving, wherein the foundation pile sound barrier has a foundation pile passage for a passage of the at least one foundation pile; - sinking the foundation pile sound barrier in the compact configuration to the water bottom and positioning the foundation pile passage at the localized position for inserting the foundation pile; - providing at least one foundation pile to be inserted into the water bottom, wherein at least one foundation pile has an elongated foundation pile body comprising a proximal pile end and a distal pile end; - positioning the distal end of the pile body on the water bottom at the localized position to pass the foundation pile through the pile passage of the sound barrier; - extending the foundation pile sound barrier positioned on the water bottom from the compact configuration to the extended configuration. 2. Werkwijze volgens conclusie 1, waarbij de fundatiepaal geluidsbarrière en de ten minste ene fundatiepaal gepositioneerd zijn in achtereenvolgende stappen, waarbij in een eerste stap de fundatiepaal geluidsbarrière gepositioneerd wordt op de gelokaliseerde positie op de waterbodem en waarbij in een tweede stap de fundatiepaal gepositioneerd wordt op de gelokaliseerde positie en door de paaldoorgang van de fundatiepaal geluidsbarrière wordt gevoerd.Method according to claim 1, wherein the foundation pile sound barrier and the at least one foundation pile are positioned in successive steps, wherein in a first step the foundation pile sound barrier is positioned at the localized position on the water bottom and wherein in a second step the foundation pile is positioned sound barrier is conducted at the localized position and through the pile passage of the foundation pile. 3. Werkwijze volgens conclusie 2, waarbij een barrière-schip omvattende fundatiepaal geluidsbarrière equipment gebruikt wordt om de fundatiepaal geluidsbarrière op een waterbodem te positioneren en waarbij een fundatiepaal-schip omvattende fundatiepaal handling equipment gebruikt wordt om de fundatiepaal te positioneren.The method of claim 2, wherein a barrier vessel comprising foundation pile sound barrier equipment is used to position the foundation pile noise barrier on a water bottom and wherein a foundation pile vessel comprising foundation pile handling equipment is used to position the foundation pile. 4. Werkwijze volgens conclusie 1, waarbij de fundatiepaal geluidsbarrière en de fundatiepaal simultaan in een samenstel naar de waterbodem van het waterlichaam worden afgezonken, waarbij het samenstel een fundatiepaal geluidsbarrière omvat die aan het distale einde van de fundatiepaal is verbonden.The method of claim 1, wherein the foundation pile sound barrier and the foundation pile are sunk simultaneously in an assembly to the water bottom of the body of water, the assembly comprising a foundation pile sound barrier connected to the distal end of the foundation pile. 5. Werkwijze volgens een van de voorgaande conclusies, waarbij de fundatiepaal geluidsbarrière een flexibel geluidsbarrièregedeelte omvat omvattende ten minste opblaasbaar scherm welke ten minste een in hoofdzaak luchtdicht gascompartiment omvat, waarbij de werkwijze een stap omvat van het opblazen van het scherm om het opblaasbare scherm naar de uitgestrekte configuratie te brengen.A method according to any one of the preceding claims, wherein the foundation pile sound barrier comprises a flexible sound barrier section comprising at least an inflatable screen which comprises at least one substantially airtight gas compartment, the method comprising a step of inflating the screen around the inflatable screen towards to bring the vast configuration. 6. Werkwijze volgens een van de voorgaande conclusies, waarbij de werkwijze een stap van het produceren van luchtbellen omvat langs ten minste een gedeelte van de barrièrewand gedurende een hei-operatie.The method of any one of the preceding claims, wherein the method comprises a step of producing air bubbles along at least a portion of the barrier wall during a pile-driving operation. 7. Werkwijze volgens een van de voorgaande conclusies, waarbij de werkwijze verder de stappen omvat van: - het aanvangen en volbrengen van een fundatiepaal hei-operatie voor het in de waterbodem heien van de fundatiepaal; - het in laten zakken van de fundatiepaal geluidsbarrière van de uitgestrekte configuratie naar de compacte configuratie na het volbrengen van de fundatiepaal hei-operatie; - het heffen van de fundatiepaal geluidsbarrière van de waterbodem naar het waterniveau; en - het verwijderen van de fundatiepaal geluidsbarrière in de compacte configuratie van de fundatiepaal.Method according to one of the preceding claims, wherein the method further comprises the steps of: - starting and completing a foundation pile pile-driving operation for pile-driving the foundation pile into the water bottom; - lowering the foundation pile sound barrier from the extended configuration to the compact configuration after completing the foundation pile pile-up operation; - lifting the foundation barrier sound barrier from the water bottom to the water level; and - removing the foundation pile sound barrier in the compact configuration of the foundation pile. 8. Werkwijze volgens een van de conclusies 1-6, waarbij de werkwijze verder de stappen omvat van: - het aanvangen en completeren van een fundatiepaal hei-operatie voor het in de waterbodem heien van de fundatiepaal; - het openen van de barrièrewand van de fundatiepaal geluidsbarrière na het completeren van de fundatiepaal hei-operatie om een zijwaarts gerichte doorgang voor de geheide fundatiepaal te verschaffen; en - het zijwaarts verwijderen van de fundatiepaal geluidsbarrière van de fundatiepaal.A method according to any of claims 1-6, wherein the method further comprises the steps of: - starting and completing a foundation pile pile-driving operation for pile-driving the foundation pile into the water bottom; opening the barrier wall of the foundation pile sound barrier after completing the foundation pile pile-up operation to provide a side-facing passage for the mounted foundation pile; and - the lateral removal of the foundation pile sound barrier from the foundation pile. 9. Werkwijze volgens conclusie 7 of 8, waarbij de fundatiepaal geluidsbarrière een opblaasbaar scherm heeft als een barrièrewand, waarbij het scherm ten minste gedeeltelijk wordt gehandhaafd in een opgeblazen conditie tijdens het verwijderen van de fundatiepaal geluidsbarrière van de fundatiepaal.A method according to claim 7 or 8, wherein the foundation pile sound barrier has an inflatable screen as a barrier wall, wherein the screen is at least partially maintained in an inflated condition during removal of the foundation pile sound barrier from the foundation pile. 10. Fundatiepaal geluidsbarrière voor het reduceren van geluid gedurende een offshore fundatiepaal hei-operatie, waarbij de fundatiepaal geluidsbarrière omvat: - een ballast element voor het verschaffen van een ballast gewicht voor het afzinken van de fundatiepaal geluidsbarrière naar een waterbodem van een waterlichaam; - ten minste een inklapbaar scherm, waarbij het scherm een schermlichaam omvat met een vrij schermeinde en een gefixeerd schermeinde, waarbij het gefixeerde schermeinde verbonden is aan het ballast element, waarbij het inklapbare scherm uitstrekbaar is in een axiale richting van een compacte configuratie naar een uitgestrekte configuratie; - een extensie-eenheid voor het bedienen van het inklapbare scherm van de compacte configuratie naar de uitgestrekte configuratie, met het kenmerk dat het inklapbare scherm een opblaasbaar scherm is, waarbij het opblaasbare scherm ten minste een gascompartiment omvat, waarbij het opblaasbare scherm bedienbaar is tussen de compacte configuratie en de uitgestrekte configuratie door het opblazen, waarbij de extensie eenheid een blaasrichting omvat voor het op druk brengen van het opblaasbare scherm, waarbij de blaasinrichting in stromingsverbinding is met het opblaasbare scherm.A foundation pile sound barrier for reducing noise during an offshore foundation pile pile-driving operation, wherein the foundation pile sound barrier comprises: - a ballast element for providing a ballast weight for sinking the foundation pile sound barrier to a water bottom of a body of water; - at least one collapsible screen, wherein the screen comprises a screen body with a free screen end and a fixed screen end, wherein the fixed screen end is connected to the ballast element, the collapsible screen being extendable in an axial direction from a compact configuration to an extended configuration; - an extension unit for operating the collapsible screen from the compact configuration to the extended configuration, characterized in that the collapsible screen is an inflatable screen, wherein the inflatable screen comprises at least one gas compartment, the inflatable screen being operable between the compact configuration and the expanded configuration by inflating, wherein the extension unit includes a blowing direction for pressurizing the inflatable screen, the blowing device being in flow communication with the inflatable screen. 11. Fundatiepaal geluidsbarrière volgens conclusie 10, waarbij de fundatiepaal geluidsbarrière een terugtreksysteem heeft voor het terugtrekken van een scherm vanuit de uitgestrekte configuratie naar de compacte configuratie, waarbij het terugtreksysteem een opwindinrichting omvat met ten minste een kabel die zich vanaf het ballast element naar het vrije einde van het scherm uitstrekt, waarbij een distaai einde van de ten minste ene kabel verbonden is aan het vrije einde van het scherm en waarbij een proximaal einde van de ten minste ene kabel verbonden is met de opwindinrichting voor het opwinden van de kabel.The sound barrier foundation pole according to claim 10, wherein the sound barrier foundation pole has a retraction system for retracting a screen from the extended configuration to the compact configuration, the retraction system comprising a winding device with at least one cable extending from the ballast element to the free one end of the screen, wherein a distal end of the at least one cable is connected to the free end of the screen and wherein a proximal end of the at least one cable is connected to the winding device for winding the cable. 12. Fundatiepaal geluidsbarrière volgens conclusie 10 of 11, waarbij de fundatiepaal geluidsbarrière te openen is aan zijn buitenomtrek voor een radiale verwijdering van de fundatiepaal geluidsbarrière van een fundatiepaal.A sound barrier foundation pile according to claim 10 or 11, wherein the sound barrier foundation pile can be opened at its outer circumference for radial removal of the foundation barrier sound barrier from a foundation pile. 13. Fundatiepaal geluidsbarrière volgens een van de conclusies 10-12, waarbij de fundatiepaal geluidsbarrière ten minste twee opblaasbare schermen omvat, in het bijzonder een binnen en een buiten gelegen opblaasbaar scherm, waarbij het binnen en buiten gelegen scherm in hoofdzaak concentrisch zijn gepositioneerd.A foundation pole sound barrier according to any of claims 10-12, wherein the foundation pole sound barrier comprises at least two inflatable screens, in particular an inflatable screen located inside and outside, wherein the screen located inside and outside are positioned substantially concentrically. 14. Fundatiepaal geluidsbarrière volgens conclusie 13, waarbij het binnen en buiten gelegen opblaasbare scherm op afstand van elkaar zijn gepositioneerd om als zodanig een tussengelegen ruimte tussen het binnen en buiten gelegen scherm te definiëren.The sound barrier foundation pole according to claim 13, wherein the inflatable screen located inside and outside is spaced apart to define as such an intermediate space between the screen located inside and outside. 15. Fundatiepaal geluidsbarrière volgens conclusie 14, waarbij de fundatiepaal geluidsbarrière een vloeistofpomp omvat voor het pompen van vloeistof, waarbij de vloeistofpomp in stromingsverbinding is met de tussen gelegen ruimte om een toevoer of afvoer van vloeistof van en naar de tussen gelegen ruimte mogelijk te maken.The sound barrier foundation pile as claimed in claim 14, wherein the sound barrier foundation pile comprises a liquid pump for pumping liquid, the liquid pump being in flow communication with the intermediate space to enable a supply or discharge of liquid from and to the intermediate space. 16. Fundatiepaal geluidsbarrière volgens een van de conclusies 10-15, waarbij de fundatiepaal geluidsbarrière een belleninrichting omvat met een luchtpomp en een spuitmond inrichting voor het afgeven van luchtbellen, waarbij de spuitmondinrichting gepositioneerd is in een lager gelegen gebied van de fundatiepaal geluidsbarrière en in stromingsverbinding verbonden is met de luchtpomp, waarbij de spuitmondinrichting is ingericht om bellen te verschaffen om een luchtgordijn langs een omtreksoppervlak van een scherm te vormen.A sound barrier foundation pile according to any of claims 10-15, wherein the sound barrier foundation pile comprises a bubble device with an air pump and a nozzle device for delivering air bubbles, the nozzle device being positioned in a lower region of the foundation pile sound barrier and in flow communication is connected to the air pump, the nozzle arrangement being adapted to provide bubbles to form an air curtain along a peripheral surface of a screen. 17. Fundatiepaal geluidsbarrière volgens een van de conclusies 16, waarbij het opblaasbare scherm een verscheidenheid aan naast elkaar gelegen opblaasbare gascompartimenten omvat, waarbij de gascompartimenten een langwerpig compartiment lichaam hebben die een longitudinale as definiëren welke longitudinale as gericht is in een omtreksrichting van het scherm.A foundation pole sound barrier according to any one of claims 16, wherein the inflatable screen comprises a variety of adjacent inflatable gas compartments, the gas compartments having an elongated compartment body defining a longitudinal axis which is longitudinal axis directed in a circumferential direction of the screen. 18. Fundatiepaal geluidsbarrière volgens conclusie 17, waarbij radiaal naburige gascompartimenten van het binnen en buiten gelegen opblaasbare scherm in stromingsverbinding met elkaar zijn voor het simultaan opblazen van het binnen en buiten gelegen scherm.The foundation barrier sound barrier according to claim 17, wherein radially adjacent gas compartments of the inflatable screen located inside and outside are in flow communication with each other for simultaneously inflating the screen located inside and outside. 19. Gebruik van een fundatiepaal geluidsbarrière volgens een van de conclusies 10-18 in een werkwijze volgens een van de conclusies 1-9.Use of a foundation pile sound barrier according to any of claims 10-18 in a method according to any of claims 1-9.
NL2010548A 2013-03-29 2013-03-29 Pile noise barrier and method for installing the pile noise barrier to obtain a noise reduction during an offshore ramming operation. NL2010548C2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60159218A (en) * 1984-01-28 1985-08-20 Ishikawajima Harima Heavy Ind Co Ltd Sound-insulator for pile hammer
WO2011046430A1 (en) * 2009-10-16 2011-04-21 Ihc Holland Ie B.V. Assembly of telescopic pipe sections
WO2012177131A1 (en) * 2011-06-22 2012-12-27 Ihc Holland Ie B.V. Centre system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60159218A (en) * 1984-01-28 1985-08-20 Ishikawajima Harima Heavy Ind Co Ltd Sound-insulator for pile hammer
WO2011046430A1 (en) * 2009-10-16 2011-04-21 Ihc Holland Ie B.V. Assembly of telescopic pipe sections
WO2012177131A1 (en) * 2011-06-22 2012-12-27 Ihc Holland Ie B.V. Centre system

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