GB2509208A

GB2509208A - Offshore pile installation accoustic barrier structure and method of installation

Info

Publication number: GB2509208A
Application number: GB1317473.5A
Authority: GB
Inventors: Alan West; John Giles; Paul Wilson; Charles Whyte
Original assignee: W3G PILLING NOISE MITIGATION Ltd; W3G SHIPPING Ltd
Current assignee: W3G PILLING NOISE MITIGATION Ltd; W3G SHIPPING Ltd
Priority date: 2012-11-26
Filing date: 2013-04-02
Publication date: 2014-06-25
Anticipated expiration: 2033-04-02
Also published as: GB2509208B; WO2014080233A1; GB201317473D0; GB201221241D0

Abstract

An apparatus 100 configured to provide an acoustic barrier between an offshore pile 200 and a surrounding body of water 500 during deployment of a pile 200 from the water surface 310 and securing it into the seabed 300, as well as a method of use thereof. In some examples, the invention relates to a guide apparatus 110. The claimed apparatus comprises a dampening structure (1800 figure 9), arranged to provide an acoustic barrier between a pile 200 and a surrounding body of water 500, wherein said dampening structure (1800 figure 9) comprises one or more dampening segments (3013, figure 10). These segments (3013, figure 10). are composed of a number or plurality of layers or sheets or spaces, and may comprise a number or plurality of discrete layers or sheets (3015 figure 19a) and any said spaces may be filled with a fluid or gas.

Description

OFFSHORE STRUCTURES AND ASSOCIATED APPARATUS AND METHODS

FIELD OF INVENTION

The invention relates to the field of structures, such as offshore structures, associated apparatus and methods. In particular, though not exclusively, the invention relates to offshore structures, such as wind turbine structures, for example, piles for offshore wind turbines, and associated apparatus and methods.

BACKGROUND TO INVENTION

During installation of an offshore wind farm, supporting piles are driven into the seabed in order to support each tower, nacelle and turbine. These piles are generally transported to the desired location, and then hammered into position using a pile hammer, which mechanically connects with the upper region of the pile.

There is an increasing concern that the noise emitted during this hammering process is harmful to the environment, and in particular the subsea environment.

In addition, unfavourable or adverse weather conditions can reduce the opportunities and time windows when such piles and other offshore apparatus can be deployed. In some regions, such as Northern Europe, the cost and risks associated with deploying such piles, and other offshore apparatus, can be higher due to such variable and seasonal weather conditions, which may give rise to pitching, rolling, etc., of any deployment vessels. Such movement may not only be detrimental to the success of the project, but also potentially hazardous to equipment and persons.

The problems associated with such variable and seasonal conditions can be exacerbated when deploying such structures in deeper waters (e.g. 40, 50 or 60 meters, or more), which may be further away from shore.

Furthermore, transporting piles, and/or other such offshore equipment, to and from offshore sites can also be expensive due to the need to store a significant amount of equipment on a vessel (e.g. on the deck of a vessel). Any reduction in the space requirements of such equipment can help reduce costs.

It will also be appreciated that in some cases, the water depth in which such piles (or other such supports) are located can very from site to site. For example, some offshore sites may be based in water depths of 10 metres or less, while others may be in water depths of 50 metres or more, which can cause problems when choosing the appropriate piles, supports, equipment and other tools needed for each site.

The problems associated with installing supporting piles, or like, may also be present when constructing other structures offshore, including bridges, harbours, coastal walks, oil and gas structures, or the like.

There is a need to address some or all of these background issues.

It should be noted that this background merely serves to set the scene to allow a skilled reader to better appreciate the following description. Therefore, none of the above discussion should necessarily be taken as pertaining to known prior art, or common

general knowledge in this field.

SUMMARY OF INVENTION

According to a first aspect of the invention, there is provided guide apparatus for a pile, such as an offshore pile, the apparatus comprising a dampening structure or material.

The dampening material may be configured to provide a difference in acoustic impedance between the apparatus and surrounding water (e.g. an acoustic barrier).

The dampening material may be provided as a coating, layer, or the like, which may be provided on the inner and/or outer of the apparatus (e.g. in the inner and/or outer of the guide portion). The dampening material may comprise a substrate having a plurality of gas-filled compartments or pockets. The dampening material may be configured as a coat (e.g. a wrapable coat for the guide apparatus, or portion).

The dampening material/structure may comprise a plurality of gas-fillable compartments, pockets or bladders. The bladders may be inflatable and deflatable.

The guide portion may be configured with a plurality of bladders, spaced both circumferentially as well as lengthwise along the inside of the guide portion. The bladders may additionally comprise an outer friction sleeve, having an interface surface to allow reduced friction contact with a pile (e.g. comprising bristles, or the like).

The apparatus may comprise one or more dampening segments as the dampening structure. Each dampening segment may be configured to surround (e.g. fully surround) a pile, or the like. The dampening segments may be aftached, joined or bonded together to provide the effective height of the apparatus (e.g. bonded together at a segment joints). The dampening segments may be considered to be discrete segments.

In some examples, the dampening segments may be configured to be coupled and decoupled to vary the effective height of the apparatus (e.g. couple together at a segment joints). The apparatus may be configured such that dampening segments can be added together and/or removed so as to vary an effective height of the apparatus.

Each of the segments (e.g. the apparatus) may be configured to be opened and closed and so as to surround a pile, or the like (e.g. opened and closed lengthwise so as to surround a pile). The segments may be fixable in the closed configuration (e.g. using fasteners, such as hook and hoop fasteners, zips, lacing, or the like). The segments may be fixable at an inner side and/or an outer side of the segment.

The/each segment may comprise a number or plurality of layers or sheets, e.g. a number of discrete layers. The number of layers may be varied so as to increase or decrease the width of the/each segment. A/each layer of the number of layers may be arranged or positioned in a lateral direction with respect to the apparatus and/or pile.

For example, the/each layer may extend lengthwise along each/the segments, apparatus and/or pile. Alternatively or additionally, the/each layer of the number of layers may extend circumferentially with respect to each/the segment, apparatus and/or pile. The number of layers may be coaxially and/or concentrically arranged, e.g. each layer of the number of layers may be arranged coaxially or concentrically to one another within each/the segment(s). For example, the/each layer of the numbers of layers may be arranged or positioned so as to surround at least a portion of one another. The/each layers may be coupled, laminated and/or bonded together.

The/each layer of the number of layers may define or comprise a width or thickness.

The/each layer of the number of layers may have substantially the same width.

Alternatively or additionally, the/each layer of the number of layers may have a different width. The width of the/each layer may be varied so as to dampen, absorb and/or attenuate acoustic waves. By providing the segment with a number of layers one or more differences in acoustic impedance between the apparatus and surrounding water may be provided and/or controllable.

The/each layer of the number of layers may define or comprise the damping material.

The damping material may dampen, absorb and/or attenuate acoustic waves, e.g. acoustic pressure waves. Alternatively or additionally, the damping material may provide one or more differences in acoustic impedance between the layers of each/the segment(s) and/or the apparatus and surrounding water. The/each layer of the number of layer may comprise the same damping material. Alternatively or additionally, the/each layer of the number of layers may comprise a different damping material. The damping material may be deformable, flexible and/or compressible. The number of layers may define or provide a sequence, series or order of damping materials. For example! the damping materials may comprise bulk insulating materials, e.g. visco elastic materials, concrete, woodwool, glasswool or the like.

Each/the segment may define or comprise one or more space(s) or gap(s). The gap(s) may be formed or extend between neighbouring or adjacent layers of the number of layers. A/the gap(s) may extend, e.g. laterally extend, between the layers. The layers may be arranged or positioned in the segment and/or apparatus so as to form the gap(s). The gap(s) may define or comprise a width or thickness. The width of the gap(s) may be controlled by positioning or arranging neighbouring layers with respect to another. The width of some or all gaps may be substantially the same. Alternatively, the width of some or all gaps may vary or differ. The gap(s) may extend circumferentially between the layers of each/the damping segments. Alternatively or additionally, the gap(s) may extend lengthwise along the layers of each/the segment(s).

The gap(s) may comprise or may be filled or fillable with, e.g. in use, a further material.

The further material may provide or act as an acoustic barrier. Alternatively or additionally, the further material may be configured to provide a difference in acoustic impedance between the layers of each/the segment(s) and/or the apparatus and the surrounding water. In some examples, the further material may comprise a fluid, gas, e.g. air, or a liquid, e.g. sea water or brine. In other examples, the further material may alternatively or additionally define or comprise an elastic and/or porous material, or foam or the like. The material may be configured to join or bond the layers of each/the segment(s). The material may be deformable, flexible and/or compressible. The elastic and/or porous material may be applied in the gap(s) between the layers of each/the segment(s). Alternatively or additionally, the material may be applied to and/or on one or more surface(s), such as one or more outer surface(s), of the each/the segment(s).

By providing a further material in the gap(s) between the layers of each/the segments dampening, attenuation and/or absorption of acoustic waves may be influenced and/or controllable.

The gap(s) may comprise bubbles, such as fluid or gas bubbles. A system for forming bubbles and/or a bubble curtain may be provided and/or positioned within the gap(s) so as to provide the bubbles. The bubbles system may be integral with a portion of one or more of the layers and/or segment(s). Alternatively, the bubble system may be provided separately from the layers and/or segment(s). The bubbles or bubble curtain may provide an acoustic barrier and/or cause a difference in acoustic impedance between the layers and/or segment(s). By providing bubbles with the gap(s) between the layers and/or segments the dissipation of bubbles due to strong water current may be decreased. Alternatively or additionally, the bubble system may be provided and/or positioned outside of the apparatus.

In some examples, the one or more segments may define an arrangement of segments. Each/the segments of the arrangement may be arranged so that the one or more segments substantially surround a pile. Each/the segment(s) of the arrangement may be arranged or positioned in a lateral direction. The segments may be coaxially and/or concentrically arranged, e.g. the one or more segment(s) may be arranged coaxially or concentrically to one another. The segment(s) may be arranged or positioned so as to surround at least a portion of one another. Each/the segment of the arrangement may define or comprise one or more discrete segment(s). By providing one or more segment(s), the damping, attenuation and/or absorptions of acoustic waves may be influenced and/or controllable.

Each/the segments of the arrangement of segments may define or comprise a width or thickness. The width or thickness of some or all segments may be substantially the same. Alternatively, the width or thickness some or all segments may be different.

width of the segment(s) may increase from the inner to the outer of the apparatus.

Alternatively! the width of the segment(s) may decrease from the inner to the outer of the apparatus. For example, segments positioned in the inner of the apparatus may comprise a smaller width than segments positioned in the outer of the apparatus.

Alternatively, segments positioned in the inner of the apparatus may comprise a larger width than the segments positioned in the outer of the apparatus. By providing the segments of the arrangement with varying widths dampening, attenuation and/or absorption of acoustic waves may be influenced and/or controllable.

According to a second aspect of the invention, there is provided guide apparatus for a pile, such as an offshore pile, the apparatus comprising a dampening structure or material.

The dampening material/structure may comprise a plurality of gas-tillable compartments, pockets or bladders. The bladders may be inflatable and deflatable.

The apparatus may comprise one or more dampening segments as the dampening structure. Each dampening segment may be configured to surround (e.g. fully surround) a pile, or the like. The dampening segments may be attached, joined or bonded together to provide the effective height of the apparatus (e.g. bonded together at a segment joints). The dampening segments may be considered to be discrete segments.

Each of the segments may be inflatable (e.g. gas inflatable). The segments, when inflated, may adopt a surrounding configuration. The segments, when inflated, may bias the dampening segment to the closed configuration. The segments, when inflated, may urge a length-wise opening of the segment/apparatus together so as to provide the closed configuration.

The, or each segment may comprise or define the one or more surface(s), e.g. one or more outer surface(s). The surface(s) may define or form a relationship, e.g. a fixed relationship, to one another. The, or each, segment may comprise a specific material, structure or fabric, having a particular orientation across the segment. The specific material, structure or fabric may be comprised in each/the segments and/or between the surface(s) of each/the segment(s). The material may be permeable to fluid (e.g. air). The specific material may be configured to define an orientation and/or relationship of the surface(s) with respect to the one another. The specific material may define or comprise an internal structure. The internal structure may provide rigidity of the surfaces(s) and/or each/the segment(s) when pressurised or inflated. The internal structure may define or pre-determine the shape and/or form of the/each segment(s) when pressurised or inflated. In some examples, the internal structure may be comprised or provided in one or more layers or sheets, e.g. discrete layers, of the segment.

The internal structure may be orientated, e.g. orientated radially, symmetrically, linearly, tangentially, with respect to an axial centre line of the apparatus. The inner structure may be considered to be a thread type or fibrous fabric orientated so as to provide the orientation between the surface(s). The thread type fabric may be orientated appropriately such that the threads are provided radial, symmetrical, linear, and/or tangential, to the centre line. The inner structure may act perpendicularly to some or all the surface(s) of the segment so as to provide a desired configuration of segment. Alternatively or additionally, the inner structure may be provided diagonally, slanted and/or at one or more angle(s) with respect to some or all surface(s) of the segment(s). This may also provide an effectively rigid surface, when inflated.

The segments, when deflated, may adopt (or be permitted to adopt) a stowable configuration (e.g. for storage on a vessel of the like). The segments, when deflated, may be stackable (e.g. adopt a substantially planar configuration so as to permit stacking one on top of the other).

Some or all of the dampening segments may be inflatable independent of other segments. For example, some or all of the segments may be permitted to be inflated to different pressures. Some or all of the dampening segments may comprise relief values, configured release pressure above a particular threshold (e.g. one or more pressure relief value).

Each segment may comprise a plurality of panels, which may be considered to be inflatable panels, configured to extend and surround a pile. Each segment may be configured in a substantially polygon configuration (e.g. box cross-section). In some examples, each section may comprise four panels.

Some or all of the segments may be of the same or similar effective height (e.g. 1 metre, 2 metres, 5 metres, 10 metres, or the like).

Some or all of the segments may have rigging sections, configured to attach the segment to support rigging. The rigging sections may be provided with webbing, extending from a segment.

The apparatus may comprise anchor points, provided at a lower section of at least one segment. The anchor points may be configured to couple the apparatus to a water floor (e.g. sea bed). The anchor points may permit the attachment of ballast weight, or the like (e.g. ballast configured to overcome any resultant or reactant uplift from an inflated series of segments).

The apparatus may comprise any of the features of the first aspect.

According to a third aspect of the invention there is provided a guide apparatus, such as a guide apparatus for a pile, such as an offshore pile, or the like.

The apparatus may be configured to provide an acoustic, or pressure, barrier between a pile and a surrounding body of water! during deployment of a pile (e.g. locating a pile in the seabed). The acoustic barrier may provide an acoustic impedance mismatch between the pile and surrounding water (e.g. a barrier to acoustically decouple a pile from the water). The acoustic barrier may be configured to dampen (e.g. absorb, or at least attenuate) pressure waves that would otherwise be communicated from a pile to surrounding water.

The apparatus may be configured such that the acoustic barrier surrounds (or at least substantially surrounds) some, or all, of a pile, when being deployed. The barrier may be configured so as to surround, or substantially surround, the length of a pile.

The apparatus may comprise one or more pumps configured to displace fluid from a gap (e.g. an annular gap) between the guide apparatus and an offshore pile (e.g. to dewater the gap, such as dewater and provide a gas gap). The acoustic barrier may comprise a dewatered gap. The apparatus may be configured such that the offshore pile is located within the guide apparatus (e.g. fully or partially within guide apparatus).

The apparatus may comprise one or more seals configured to seal the guide apparatus with a pile located with the apparatus. The one or more seals may be configured to prevent fluid entering the gap (e.g. from a body of water to the gap).

The guide apparatus may be configured to allow a pile to be located within the apparatus (e.g. centrally within, such as concentrically within, the apparatus). The guide apparatus may comprise one or more centralisers. The centralisers may be configured to hold, and/or guide, a pile in a particular orientation with the guide apparatus, such as concentrically with the apparatus. The centraliser may be configured as actuatable arms, such as hydraulic arms. The arms may be configured to extend and/or retract in order to hold/guide a located pile. The arms may be configured to acoustically decouple a pile from the apparatus.

The centralisers may comprise radial members, such as a radially extended cones or vanes. The radial members may define an aperture to allow for positioning and/or maintaining of a pile within the guide apparatus.

The guide apparatus may comprise a guide cone on an upper region thereof. The guide cone may be configured to allow for, and assist with, a pile to be located with the apparatus (e.g. lowered and located within the apparatus).

The guide apparatus may be considered to comprise a guide portion. The guide apparatus may comprise a piling template. In use, the piling template may be configured to be positioned on a water floor (e.g. seabed, or the like). The piling template may be configured to stabilise the apparatus on a water floor. In some case, for example when the apparatus comprises a guide portion, the template may provide, or be configured to provide, a ballast for such a guide portion.

The guide portion may be configured to locate, and be positioned with, the template to allow for guiding of a pile to the water floor. The apparatus may be configured such that, in use, the guide apparatus (e.g. guide portion) extends above, and out of. the water. The guide portion may be configured as a sleeve.

In examples comprising one or more seals, one, some or all of those seal(s) may be positioned at a lower region of the guide apparatus (e.g. at a lower region of the guide portion). The seal(s) may be annular (e.g. one or more tyre seals). The seal(s) may be inflatable and/or deflatable. The seal(s) may be configured to allow a located pile to translate with respect to the seal. In such cases, the seal may still provide sealing. In similar words, the seals may be configured to seal the apparatus with the pile, yet not grip that pile to an extent that would significantly inhibit movement of that pile when being deployed, such as hammered into the seabed.

The guide apparatus may comprise a constriction, such as a region of reduced annular diameter. The constriction may be associated with one or more of the seals (e.g. at a region near, adjacent, etc. the seal(s)). The constriction may assist with locating a pile with the apparatus. The constriction may allow for a minimal gap (e.g. about 50 cm, about 25cm, about 10 cm, about 5cm, or about 1 cm) to exist between a seal and a located pile (e.g. prior to inflation).

The apparatus (e.g. the acoustic barrier) may comprise a dampening structure or material. The dampening structure or material may be configured to provide a difference in acoustic impedance between the apparatus (e.g. the guide portion) and surrounding water. The dampening structure or material may be provided as a coating, which may be provided on the inner and/or outer of the apparatus (e.g. in the inner and/or outer of the guide portion). The dampening structure or material may comprise a substrate having a plurality of gas-filled compartments or pockets (e.g. bladders). The dampening structure or material may be configured as a jacket (e.g. a wrapable jacket) for the guide apparatus, or guide portion.

The piling template may comprise one or more guide sockets. Each guide socket may be configured to allow for location of a guide portion with the piling template. The guide socket(s) may be configured to align, or position, a pile being deployed with a desired location to be deployed.

The guide apparatus may be configured to allow for movement of the guide portion between one or more of the guide sockets. For example, the apparatus may be configured to allow for raising and lowering of the apparatus/guide portion. In such cases, the apparatus may be configured to move the guide portion from a first position.

associated with a first guide socket, to a second position associated with a second guide socket. In such examples, the apparatus may be configured to ensure that the guide portion is aligned with the first socket when in the first position and also aligned with the second socket when in the second position.

The guide sockets may be separated or spaced from one another, such as radially and/or circumferentially separated, on the piling template. The apparatus may be configured to move the guide portion in an arcuate manner between first and second position. The apparatus may be configured to move the guide portion between further positions/sockets (e.g. three, four, five and more). The piling template may comprise one or more stabilisers, to stabilise and/or orientate the apparatus with a water floor.

The, or each, stabiliser may have a stowed configuration and a deployed configuration.

When deployed, the stabilisers may permit the apparatus to remain stable on, for example, a seabed. In the deployed configuration, the stabiliser may have been rotatably moved from a stowed configuration. Each stabiliser may be configured to be able to be locked, or retained, in the deployed configuration.

The sockets and/or guide portion may be able to be moved relative to the stabilisers (e.g. so that they can be more suitably vertically aligned in cases of an uneven seabed). The apparatus may comprise a main frame, which connects the guide portion and/or sockets, and which is configured to be moveable with respect to the stabilisers.

The movement may be controllable. The apparatus may comprise a gimbling system to effect movement, which may be a controllable gimbling system.

The guide portion may be separable to allow a pile to be positioned within the guide portion. The guide portion may comprise an open configuration, and a closed configuration. The guide portion may be opened and closed, for example, along a lengthwise body axis (i.e. so as to allow the insertion of a pile from the side of the apparatus, rather than being lowered into the apparatus).

The guide portion may comprise two or more segmented portions (e.g. circumferentially segmented), at least one of which may be movable so as to open and close around a pile. The apparatus may comprise three segmented portions.

The guide portion may comprise a separable frame, configured to open to allow insertion and/or removal of a pile (or other driven structure) from the apparatus.

When in a closed configuration, the guide portion may surround a pile being deployed.

The apparatus may be configured to allow the guide portion to couple, or mate, with some or all of the sockets. The apparatus may comprise complementary mating elements, such as a lip and groove, to allow the guide portion to couple/mate with a particular socket (e.g. when the guide portion has been closed).

The guide portion may be configured such that, when moved to closed configuration the segments couple with a complimentary element of the socket (or other feature on the template).

The guide portion may comprise an acoustic dampening structure (e.g. material). The dampening structure may be provided on an inner and/or outer surface of the guide portion. In some example, the dampening structure may be provided at least on an inner surface thereof For example, the apparatus may comprise dampening material configured to provide a difference in acoustic impedance between the inner annulus of the guide portion, and surrounding water (e.g. without the use a pump/seal).

The dampening structure may be configured to attenuate acoustic transmission from a pile to a body of water. In examples that use an opening/closing guide portion, then the dampening structure may be configured to attenuate acoustic transmission when the guide portion is in a closed configuration around a pile.

The guide portion may be configured such that the dampening structure abuts against a pile when located. For example, after closing the guide portion, the apparatus may be configured such that the dampening structure interfaces against a pile. In some cases, the process of closing the guide portion may be considered to urge water from an inner annulus of the guide portion (e.g. forcing water out ot the annulus).

An intended interface surface of the dampening structure may be configured for reduced friction (e.g. using bristles on the interface surface, or a lubricious material, or the like). An intended interface surface of the dampening structure may be configured to allow for translating vertical movement of the pile within the guide portion (e.g. using rollers, or the like, on the interface surface).

The dampening structure may comprise one or more gas-filled pockets, or the like, or closed-cell foam, or the like.

Some or all of the dampening structure may be compressible against a pile in order to couple to a pile. Such a configuration may also assist in removing water from around a located pile.

The dampening structure may comprise a plurality of gas-fillable compartments, pockets or bladders. The bladders may be inflatable and/or deflatable. The guide portion may be configured with a plurality of bladders, which may be spaced both circumferentially and/or lengthwise along the inside of the guide portion. Some or all of the bladders may be configured in rings, or the like.

Some or all of the bladders may additionally comprise an outer friction surface or sleeve, having an interface surface to allow reduced friction contact with a pile (e.g. comprising bristles, or the like).

The apparatus may be configured to provide gas bubbles between a pile and the guide portion (e.g. between the dampening structure and a pile). The apparatus may be configured such that gas bubbles are adhered or retained to or with the outer friction surface (e.g. between the bristles of the outer friction surface).

In some examples, the dampening structure need not couple (e.g. touch) to a located pile, but may merely be provided (e.g. inflate) so as establish an impedance barrier (e.g. a gas jacket) around a pile, and any water remaining between a located pile and the dampening structure.

The apparatus may comprise any of the features of the first and/or second aspect.

According to a fourth aspect of the invention, there is provided guide apparatus for a pile, such as an offshore pile, the apparatus comprising a dampening structure or material.

The, or each, segment may comprise a specific material, structure or fabric, having a particular orientation across the segment. The material may be permeable to fluid (e.g. air) and may be orientated radially to an axial centre line of the apparatus. The material may be considered to be a thread type fabric (e.g. a drop-stitch type fabric) orientated appropriately such that threads are provided radial to the centre line. The segment may be considered to have inner material or structure that acts perpendicularly to some or all the surface of the segment so as to provide a desired configuration of segment. This may also provide an essentially rigid surface, when inflated.

Sortie or all of the segments may have rigging sections, configured to attach the segment to support rigging. The rigging sections may be provided with webbing, extending from a segment.

The apparatus may comprise any of the features of the first, second and/or third aspect.

According to a fifth aspect of the invention there is provided guide apparatus for a pile, such as an offshore pile, the apparatus comprising a guide portion and a piling template.

The piling template may have two or more guide sockets for locating the guide portion with the piling template. The apparatus may be configured to allow for moving the guide portion between the sockets! so as to allow for positioning of two or more offshore piles.

The piling template may be configured to stabilise the guide portion, and/or may provide ballast for the guide portion.

When in a closed configuration! the guide portion may surround a pile being deployed.

The apparatus may comprise any of the features of the first, second, third and/or fourth aspect.

According to a sixth aspect there is provided a method for providing, or deploying, a pile at an offshore site.

The method may comprise locating an offshore pile with a guide apparatus. The method may comprise providing an acoustic barrier between the pile and a body of water.

The method may comprise sealing the offshore pile with the guide apparatus. The method may comprise displacing water from a gap between the guide apparatus and the pile.

The method may comprise using a hammer to secure the pile into a water floor. The method may comprise unsealing the offshore pile with the guide apparatus. The method may comprise allowing the gap to fill with fluid. The method may comprise removing (e.g. lifting) the guide apparatus from a secured pile.

The locating of an offshore pile with a guide apparatus may including lowering the pile within the guide apparatus. The method may comprise centralising (e.g. concentrically) the pile with the apparatus.

The method may comprise (e.g. initially comprise) locating a guide portion of the apparatus with a piling template of the apparatus, then locating the offshore pile with the guide apparatus.

The method may comprise inflating a seal (e.g. an annular seal) in order to seal the pile. The method may comprise deflating a seal in order to unseal the pile (e.g. to allow for removal).

The apparatus may comprise a guide portion and a piling template. The piling template may comprise one or more guide sockets. Each guide socket may be configured to allow for location of a guide portion with the piling template. The guide sockets may be separated, such as radially separated, on the piling template.

The method may comprise moving the guide portion between one or more of the guide sockets. The method may comprise raising and lowering of the apparatus/guide portion. The method may comprise raising the guide portion, and moving the guide portion to be positioned above a further guide socket, and then lowering the guide portion. The method may comprise positioned the guide portion above a further guide socket when at least a portion of the guide portion in above water level.

According to a seventh aspect of the invention, there is provided a method of reducing the acoustic emissions during positioning of an offshore pile, comprising using guide apparatus comprising a dampening structure or material.

The dampening structure or material may be considered to be an acoustic barrier. The dampening material may be configured to provide a difference in acoustic impedance between the apparatus and surrounding water. The dampening material may be provided as a coating, layer, or the like, which may be provided on the inner and/or outer of the apparatus (e.g. in the inner and/or outer of the guide portion). The dampening material may comprise substrate having a plurality of gas-filled compartments or pockets. The dampening material may be configured as a coat (e.g. a wrapable coat for the guide apparatus! or portion).

The method may comprise opening the guide portion to allow location of pile within the apparatus, and then closing the guide portion around the pile. The method may comprise inflating a plurality of bladders, which may be spaced both circumferentially and/or lengthwise along the inside of the guide portion.

The method may comprise using one or more dampening segments as the dampening structure. Each dampening segment may be configured to surround (e.g. fully surround) a pile, or the like.

The method may comprise providing a first dampening segment to surround a pile, or the like, and then adding (e.g. bonding) a second dampening segment to the first dampening segment so as to increase the effective height of the dampening structure.

The method may comprise removing dampening segments (e.g. after a pile has been located).

The method may comprise coupling and decoupling dampening segments so as to vary the effective height of the apparatus (e.g. couple together at a segment joints).

The method may comprise opening and closing each dampening segment and surrounding a pile, or the like with the dampening segments (e.g. opening and closing lengthwise so as to surround a pile). The method may comprise fixing the segments in the closed configuration (e.g. using fasteners, such as hook and hoop fasteners, zips, lacing, or the like). The method may comprise fixing the segments at an inner side and/or an outer side.

The method may comprise varying, e.g. increasing or decreasing, a width of each/the segment by varying, e.g. increasing or decreasing, a number of layers or sheets provided or comprised within each/the segment. The method may further comprise varying a width or thickness of each layer of the number of layers. By varying the width of each/the segment and/or each layer, acoustic waves may be dampened, absorbed and/or attenuated.

The method may comprise dampening, absorbing and/or attenuating acoustic waves by providing damping material, which may be comprised in each layer.

The method may comprise arranging the layers so that one or more gap(s) may be formed between neighbouring or adjacent layers. The gap(s) may be formed or extend between neighbouring or adjacent damping layers. The gap(s) may laterally extend between the layers. The method may comprise arranging or positioning the layers within the each/the segment and/or apparatus so as to form the gap(s). The method may comprise controlling a width of the gap(s) by positioning or arranging neighbouring layers with respect to another.

The method may comprise filling the gap(s) with a further material. The further material may provide or act as an acoustic barrier. Alternatively or additionally, the further material may be configured to provide a difference in acoustic impedance between each/the segment(s) and/or the apparatus and the surrounding water. In some examples, the further material may comprise a liquid, e.g. water, sea water or brine. In other examples, the material may comprise a foam or the like.

The method may comprise joining or bonding the layers using the foam. The foam may be flexible, deformable and/or compressible. The foam may be applied in the gap(s) between the layers of each/the segment(s). The method may comprise applying the foam on one or more surface(s), such as one or more outer surface(s), of the each/the segment(s).

The method may comprise filling the gap(s) with bubbles, such as fluid or gas bubbles.

The method may comprise providing and/or positioning a system for forming bubbles and/or a bubble curtain within the gap(s) so as to provide the bubbles. The bubbles system may be integral with a portion of the layers and/or segment(s). Alternatively, the bubble system may be provided separately from the layers and/or segment(s). The bubbles or bubble curtain may provide an acoustic barrier and/or cause a difference in acoustic impedance between the segment(s). The method may comprise providing and/or positioning the bubble system outside of the apparatus.

The method may comprise arranging a number of segment(s) so that one or more segment(s) substantially surround a pile. The method may comprise varying the number of segment(s) so as to increase or decrease a width of the damping structure.

The method may comprise arranging segments with varying and/or the same widths.

Sortie or all of the segments of the arrangement of segments may define or comprise a width or thickness. The width or thickness of some or all of the segments may be substantially the same. Alternatively, the width or thickness some or all segments may be different.

The method may comprise inflating (e.g. inflating with air) each segment. The method may comprise inflating each segment with air and cause the segment to adopt a surrounding configuration. The segments, when inflated, may bias the dampening segment to the closed configuration. The segments, when inflated, may urge a length-wise opening of the segment together so as to provide the closed configuration.

The segments, when deflated. may adopt (or be permitted to adopt) a stowable configuration (e.g. for storage on a vessel of the like). The segments, when deflated, may be stackable (e.g. adopt a substantially planar configuration so as to permit stacking one on top of the other). The method may comprise deflating each segment, and stowing the segment.

The method may comprise inflating each segment to different pressures (e.g. depending on depth). Some or all of the dampening segments may comprise relief values, configured release pressure above a particular threshold (e.g. one or more pressure relief value).

The method may comprise considering the intended water depth, and then bonding a plurality of a segments together to provide an appropriate effective height of apparatus.

Some or all of the bonded segments may be of the same or similar effective height (e.g. 1 metre, 2 metres, 5 metres, 10 metres, or the like).

The method may comprise attaching an anchor point of a lower section of a first segment to a water floor, or to a ballast weight, and coupling subsequent segments to the first segment.

The method may comprise any of the features of the sixth aspect.

According to a eighth aspect of the invention there is provided a method for positioning two or more offshore piles, the method comprising provided guide apparatus for an offshore pile, the apparatus comprising a guide portion and a piling template, the piling template having two or more guide sockets for locating the guide portion with the piling template, and moving the guide portion between the sockets, so as to allow for positioning of two or more offshore piles.

The method may comprise any of the features of the sixth and/or seventh aspect.

According to a ninth aspect of the invention there is provided guide apparatus for an offshore pile, the apparatus comprising: one or more pumps configured to displace fluid from a gap (e.g. an annular gap) between the guide apparatus and a offshore pile located with the guide apparatus (e.g. to dewater the gap); and one or more seals configured to seal the guide apparatus with a pile located with the apparatus, the one or more seals configured to prevent fluid entering the gap.

The method may comprise any of the features of the sixth, seventh and/or eighth aspect.

According to an tenth aspect of the invention there is provided a method for providing a pile at an offshore site, the method comprising: locating an offshore pile with a guide apparatus, sealing the offshore pile with the guide apparatus; and displacing water from a gap between the guide apparatus and the pile.

The method may comprise any of the features of the sixth, seventh, eighth and/or ninth aspect.

According to a eleventh aspect of the invention there is provided apparatus for positioning an offshore pile, the apparatus comprising a guide sleeve or portion configured to receive a pile, and configured, in use, to provide a gas gap between the guide sleeve or portion and a received pile.

The air gap may be provided by using at least one seal, to seal the sleeve to the pile.

The gas gap may be provided using at least one pump (e.g. to displace fluid from the gap). The gas may be air.

The method may comprise any of the features of the sixth, seventh, eighth, ninth and/or tenth aspect.

According to a twelfth aspect of the invention there is provided method for positioning an offshore pile, the method comprising: receiving a pile within a guide sleeve or guide portion, and providing an acoustic barrier, such as gas gap, between the guide sleeve or portion and the received pile.

The method may comprise displacing water from the gap to provide the gas gap. The method may comprise pumping water from the gap to provide a gas gap (e.g. an air gap).

The method may comprise any of the features of the sixth, seventh, eighth, ninth, tenth and/or eleventh aspect.

According to an thirteenth aspect of the invention there is provided method for positioning an offshore pile, the method comprising: receiving a pile within an open guide sleeve or guide portion, and closing the guide sleeve or portion around the received pile so as to partially or fully surrounding the pile.

The method may comprise providing the guide sleeve or portion with dampening material, such that closing the guide sleeve or portion surround or partially surrounds the pile with a dampening structure or material.

The method may comprise inflating a plurality of bladders, which may be spaced both circumferentially and/or lengthwise along the inside of the guide portion.

The method may comprise any of the features of any of the above referred-to aspects.

The above summary is intended to be merely exemplary and non-limiting. The invention includes one or more corresponding aspects, embodiments or features in isolation or in various combinations whether or not specifically stated (including claimed) in that combination or in isolation.

For example, any features of the first aspect may equally be features of fourth, fifth, sixth, seventh or ninth aspects, etc., without the need to unnecessarily and list those various embodiments or features.

It will be appreciated that one or more embodiments/aspects may be useful when providing piles, or other such structures, at one or more offshore site(s), which may include installing wind turbine structures at an offshore site, or other offshore structures. Corresponding means for performing one or more of the discussed

functions are also within the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

A description is now given, by way of example only, with reference to the accompanying drawings, which are:-Figure la shows a perspective view of exemplary guide apparatus, and an offshore pile, and Figure lb shows a corresponding cross-section view; Figure 2 shows the apparatus of Figure 1 in use; Figure 3 shows an exemplary plot showing attenuation when using an acoustic barrier, exemplified as by the use of a gas gap; Figures 4a and 4b show an exemplary seal; Figures 5a, Sb and Sc further show the apparatus of Figure 1 in use; Figures 6a, 6b and 6c show a further example of guide apparatus; Figures 7a, 7b and 7c show an example of stabilisers of the apparatus of Figure 6; Figure 8 shows a lower section view of the apparatus shown in Figure 6c; Figure 9 shows an example of a dampening structure, which is exemplified as comprising bladders; Figure 10 shows a further example of apparatus 3000, which can be used as an acoustic barrier; Figure 11 shows an exemplary cross-section of a segment of the apparatus of Figure 10; Figure 12 shows an exemplary cross-section of a segment of the apparatus of Figure 10, which is openable and closable; Figure 13 shows a cross-section of the apparatus comprising inner material; Figure 14 shows a cross-section of the apparatus of Figure 10 in a stowable configuration; Figure 15 shows an example of a segment comprising complementary retaining elements; Figure 16 shows an example of a segment having anchor points; Figure ha and 17 show an example of the apparatus of Figure 10 comprising rigging sections; Figure 18 shows a segment of apparatus with a reliet value; and Figures 19 a and 19 b show a cross-sectional representation of the segment comprising a number of layers.

DETAILED DESCRIPTION OF DRAWINGS

Figure 1 a shows a perspective view of guide apparatus 100, which in this example can be considered to be guide apparatus for positioning/deploying an offshore pile 200.

The apparatus comprises a guide portion 110 and a piling template 120. In use, the piling template 120 is configured to be positioned on a water floor 300 (e.g. seabed, or the like). In this example, the guide portion 110 is configured essentially as a sleeve, through which the pile 200 can be positioned.

Here, the piling template 120 comprises four guide sockets 125. Each guide socket 125 is specifically configured to allow for location of the guide portion 110 with the piling template 120. The guide portion 110 is configured to locate, and be positioned with, the template 120 (or the socket 125 thereof) to allow for guiding of the pile 200 to the water floor 300.

The apparatus 100 is configured to allow for movement (e.g. both rotational movement and vertical movement) of the guide portion 110 so as to allow it to be moved between two of more of the guide sockets 125. In this example, the guide portion 110 can be moved relative the sockets 125 by means of a central pillar 130a and collar 130b. The piling template 120 further comprises stabilisers 140 (in this example, four stabilisers), to stabilise and/or orientate the apparatus 100 with a water floor 300.

The guide apparatus 100 further comprises a guide cone 145 on an upper region thereof. The guide cone 145 is configured to allow for the pile 200 to be lowered and located with the apparatus 100. For example, the cone 145 can assist in locating the pile within the sleeve as it can urge a pile 200 being deployed from a vessel into alignment with the sleeve.

In this particular example, and as is shown in Figure lb, the apparatus 100 is configured such that, in use, the guide portion 110 extends above, and out of, the water level 310.

To allow the pile 200 to be located within the apparatus (e.g. centrally within, such as concentrically within, the guide portion 110), in this particular example the apparatus also comprises arms 150 at the guide portion 110. The arms 150 are configured to hold, and/or guide, the pile 200 in a particular orientation within the guide portion 110.

In this example, the arms 150 are positioned at upper and middle regions of the guide portion 110. Here, the arms 150 are configured to be adjustable, and extend and/or retract (e.g. hydraulically) in order to hold/guide the pile 200. Also, in this example, the aims 150 are configured to acoustically decouple the pile 200 from the guide sleeve 110. In other similar words, the arms 150 are configured to mitigate any acoustic transmission between the pile 200 and the apparatus 100. This may be achieved by providing an appropriate impedance mismatch between the arms 150 and the pile 200 and/or guide portion 110.

While, in this example, arms 150 have been used, it will be appreciated that further apparatus, mechanisms, or features may be used to hold/guide the pile 200 within the apparatus. For example, in some cases, guide vanes located on the inner of the guide portion 110 may be used. Such guide vanes may be tapered to allow for a smooth location of the pile 200 in the guide portion 110. Further radial members, such as one or more radially extending cones each having an aperture, may be used.

The apparatus may comprise any combination of arms, vanes or radial members (some or all of which may be configured to mitigate any acoustic transmission between the pile 200 and the apparatus 100) or, even, in some cases, none of these features.

Furthermore, any of the arms, vanes or radial members may be provided with the apparatus 100 and/or the pile 200, as will be appreciated.

Figures 2a and 2b show an example of the apparatus 100 is use. Here, the guide portion 110 has been located with a particular socket 125. The pile 200, which is to be driven into the water floor 300 (e.g. seabed) by means of a hammer 400, has been lowered and located with the apparatus 100. As can be seen, fluid, and in this example water 500 fills a gap 600 between the pile 200 and guide portion 110 of the apparatus 100. In this example, due to the tubular or cylindrical construction of the pile 200 and the guide portion 110, the gap 600 is essentially annular. However! differing configurations may provide differing gaps 600. In addition, water may fill the inner of the pile 200.

In this example, the apparatus 100 comprises at least one pump 160 configured to displace fluid from the gap 600 (e.g. the annular gap 600). Here, the pump is configured to displace water to from the gap to the body of water surrounding the apparatus. The apparatus further comprises at least one seal 170 configured to seal the guide apparatus 100 with the pile 200. The seal 170 is configured to prevent fluid entering the gap 600 (e.g. from a body of water to the gap). In this example, both the seal and the pump are provided at a lower region of the guide portion 100. The pump 160, in this example, is positioned, relatively speaking, above the seal 170. In this particular example, the seal is further configured to acoustically decouple the pile 200 from the guide portion 110, in a similar manner to the arms described above. In other similar words, the seal is additionally configured to mitigate any acoustic transmission from the pile 200.

Due to the configuration of the gap 600, the seal in this example is annular (e.g. a tyre type seal). The seal(s) can be inflated and deflated to allow for sealing the apparatus with the pile 200. Here, the seal 170 is configured such that sealing is effected, but that the pile is still permitted to translate within the guide portion. A lesser radial force is required to seal the pile 200, than to seal and grip fixedly the pile 200. Therefore, sealing can be effected without restricting the, in this case, vertical movement of the pile 200.

In use, after the pile 200 has been located with the apparatus 100. the arms 150 can be actuated in order to position the pile 200 appropriately within the guide portion 110.

The seal can be actuated to seal the pile 200 with the guide apparatus 100. The pump can be operated to displace water 500 from a gap 600 between the guide portion 110 and the pile 200, such that there is an acoustic barrier (in this example a gas gap) between the guide portion 110 and the pile 200. In this case, due to guide portion being above the water level, air is permitted to fill the gap 600. Of course, in further embodiments, the gap between the pile and the apparatus 100 (in this example guide portion 110) may be filled with gas by different means, which may not be air (e.g. nitrogen). For example, the apparatus 100 may comprise a seal 170 at an upper region of the guide portion 110, such that gas can be communicated to the annular gap so as to force water from the gap, for example, at a lower region or aperture. In some cases, only an upper seal may be provided.

Irrespective, subsequently the hammer 400 can be used to secure the pile 200 into a water floor. Due to the sealing nature of the seal, which allows movement of the pile 200, the seal is not affected by the hammering of the pile into the water floor 300, and the dewatering is maintained. In some case, when not using an upper seal, water may enter the gap from above (e.g. from splashing or the like) and/or partially thought the seal (when used). In those circumstances, the pump 160 may maintain operation in order to continue to dewater the gap 600.

Due to the gas gap (and in essence the impedance decoupling between the pile 200 and the water 500), which may be an air gap or gas from a gas source, such as compressed gas,, any acoustic emission from the pile 200 to the water (e.g. the sea) is attenuated or reflected within the pile 200. In other words, the gas gap serves to prevent, or reduce, the chance that harmful (and powerful) acoustic emissions associated with the driving of the pile are communicated (or communicated to a harmful extent) to the surrounding water. As such, acoustic emissions to surrounding water that is associated with positioning (and hammering) such piles can be reduced or essentially avoided altogether. Figure 3 shows an exemplary plot 900 for one paiticulai configuration of apparatus 100, showing a ieduction acoustic transmission (dB) 910 against size of an air gap (mm) 920. As can been seen, at a given air gap of roughly 600 mm, a reduction of just over 10dB can be achieved.

Subsequent to the positioning of the pile 200, the seal 170 can be unsealed (e.g. deflated). The guide portion 110 can be iemoved befoie or after the seal 170 has been deactivated. If the gap 600 is allowed to fill with watel, then this may assist with removing (e.g. lifting) the guide portion 110 from a secured pile 200.

After one pile has been deployed and positioned, the guide portion can be moved to a subsequent socket. In such a way, and irrespective of the use of the acoustic barrier or the like, the guide portion/piling template need only be deployed once in the water, yet is able to be used to deploy and position several different piles. As such, the time taken to accurately position many piles can be reduced. Further, the cost of apparatus for deploying many piles can be minimised.

In some examples, as is shown in Figure 2, the apparatus (e.g. the removable and reusable guide portion 110) fuithei compiises a dampening structure ci material 800.

In such examples, the dampening material 800 is configured to provide a difference in acoustic impedance between the apparatus (e.g. the guide poition 110) and suriounding watei. Here, the dampening material 800 is piovided as an cuter coating, but may equally be provided on the inner of the apparatus (e.g. in the inner and/or outer of the guide portion). In some examples, dampening material 800 comprises a substrate having a plurality of gas-filled compartments or pockets. In some cases, multiple layers of substrate having gas-filled pockets are provided. In further examples, the dampening material comprises a closed-cell foam, or the like. In all cases, the dampening material is configured to attenuate the transmission of acoustic emissions from the apparatus (i.e. the guide portion 110) to the surrounding water.

Irrespective of the use of the gas gap, or piling template, etc. providing the dampening material with the guide apparatus, rather than the pile, obviates the need to repeatedly coat each pile 200. Of course, in alternative examples, the pile 200 may be provided additionally of alternatively with a dampening material 800.

In such examples, providing the piling template may help ballast, or weigh down, the guide sleeve to counteract any uplift associated with the buoyancy of the dampening structure/material. Providing ballast weight to the piling template, or support structure, rather than the guide portion can assist with ease of movement of the guide portion (e.g. between sockets).

Figures 4a and 4b shows a cross section of an example of a further exemplary seal 270 in operation, which by way of example is shown with a pump 160 and is shown at a lower region of the guide portion 110. In Figure 4a, the pile 200 has been positioned provisionally on the water floor 300 (e.g. seabed). Here, the guide portion 110 has been located with a first socket 125. In this example, the guide portion has a locator 175, which can be provided as a lip or collar, in order to locate the guide portion 110 with the socket 125. Here, the guide portion 110 comprises a constriction 700, which in this example in an annular constriction. The constriction 700 provides a reduced inner diameter of guide portion 110, though which the pile 200 can be located. Providing such a constriction 700 allows for a minimal clearance (e.g. 5 cm, 10 cm, etc.) between the seal 170 and the located pile 200. This assist with providing a seal 170 that can seal the pile, yet avoid gripping the pile 200. In addition, use of lubrication can be avoided. In this example, the constriction 700 is tapered to assist with locating of the pile at the seal 200.

Figure 4a shows the gap 600 filed with water 500. In Figure 4b, the seal has been radially inflated in order to seal the apparatus 100 with the pile 200. In addition, the pump 160 has displaced the water from the gap to the body of water. Subsequently, the pile can be driven by the hammer 400 and positioned in the seabed.

After a pile 200 has been positioned ata particular location, the guide portion 110 may be raised and associated with a further guide socket, by moving the guide portion 100 between the sockets 125, so as to allow for positioning of two or more offshore piles 200, as exemplified in Figures.

While the above described examples show a guide portion 110 in use with a piling template, it will be appreciated that in further examples, that piling template need not be used. For example, in some embodiments of the guide apparatus 100, only a guide portion 110 may be used. In those examples, the guide portion 110 may be located on the seabed, or the like, and the seal activated in the manner described above, to allow for positioning of a pile 200. Similarly, it will be appreciated that any number of seals and/or pumps may be used. For example, the guide portion 110 may be compartmentalised by respective seals and pumps to allow for positioning of a pile 200.

Additionally, further means for providing an acoustic barrier or gas gap (e.g. an air gap) between the guide portion and the pile are envisaged, and within the scope of the invention.

Figures 6a, 6b and 6c show a further example of guide apparatus 1000 for use in deploying or locating offshore structures, such as piles, or the like, which may be used to support offshore wind turbine towers.

The guide apparatus 1000 again comprises a guide portion 1100, and piling template 1200, together with guide sockets 1250 (three of which are given in this alternative example) in a similar manner to that described above. It will be appreciated that the use of sockets may be useful in some cases to allow alignment of the pile with a particular intended location from deployment. However, in other examples, the apparatus 1000 may not comprise such sockets, or the like.

Again, the guide portion 1100 is configured to locate, and be positioned with, the template 1200 (or the socket 1250 thereof) to allow for guiding of a pile 200 to the water floor 300, such as the seabed. Similarly, the apparatus 1000 allows for movement of the guide portion 1100 so as to allow it to be moved between two of more of the guide sockets 1250.

Additionally, and although not essential, the piling template 1200 here comprises stabilisers 1400 (three shown in Figure 6). Each of the stabilisers 1400 has a stowed configuration and a deployed configuration -shown as stowed (e.g. for delivery/removal at the seabed) in Figure 6a and deployed in Figures 6b and 6c. The stabilities 1400, when deployed, permit the apparatus 1000 to remain stable on, for

example, a seabed.

Figures 7a, 7b and 7c show the stabilisers 1400 in the deployed configuration, in which they have been rotatably moved from their stowed configuration. Providing a stowed configuration may permit ease of transport to/from an offshore site, for example, ease of stacking on a deck. In addition, providing a stowed configuration may permit the apparatus to be readily lowered to the water floor.

Each stabiliser 1400 is configured to be able to be locked, or retained, in the deployed configuration. Here, support struts 1410 extend from each stabiliser 1400 to a support frame 1420 of the piling template 1200 so as to lock that stabiliser 1400 in the deployed configuration.

Here, the sockets 1250 and guide portion 1100 are able to be moved relative to the stabilisers 1400 so that they can be more suitably vertically aligned (e.g. in cases of an uneven seabed). In other words, the sockets 1250 and guide portion 1100 are able to be moved so as to avoid unwanted inclination of a pile 200. It will be appreciated that such a configuration can assist with deployment of piles, where vertical, or plum.

alignment may be desired.

In this case, a main frame 1430 of the apparatus 100, which connects the guide portion 1100 and sockets 1250, is configured to be moveable with respect to the stabilisers 1400. In this example, this is achieved using a gimbling system 1600 (e.g. using controllable hydraulic cylinders, etc. as shown on Figures 7a, 7b and 7c). Of course, alternative configurations may equally be suitable. In some examples, the main frame 1430 may be self-rightening with respect to the stabilisers. In such a configuration, no user input may be required in order to achieve appropriate vertical alignment.

Unlike the example given in relation to Figure 1, the guide portion 1100 shown in Figure 6c is configured essentially so as to be separable to allow the pile 200 to be positioned within the guide portion 1100. The guide portion 1100 can be considered to have an open configuration and a closed configuration. Such configurations can assist with insertion and retention of a pile to be positioned/deployed.

The guide portion 1100 opens and closes along a lengthwise body axis 1700 so as to allow the insertion of a pile 200 from the side of the apparatus 1000 (i.e. rather than only being lowered into the apparatus 200). Here, the guide portion 1100 is circumferentially segmented into three portions 11 OOa, 11 OOb, 1 lOOc at least two of are movable so as to open and close around a pile 200 -see Figure 8. Of course, the pile may still be insertable from the top also. Further, it will be appreciated that in alternative examples, the guide portion 1100 may comprise a frame or the like, not necessarily circumferentially segmented, but still configured to provide an open configuration and a closed configuration, as will readily be appreciated by a skilled reader.

When using the guide apparatus 1000 of Figure 6. a pile 200 can be lowered into a body of water initially (e.g. a lower section of the pile 200 placed in the water), for example during adverse weather conditions, and then moved into position within an open guide portion 1100. After the pile 200 has been located within the guide portion 1100 (e.g. at least partially located), the guide portion 1100 can close to surround the located pile 200.

Permitting the pile 200 to be initially lowered into the body of water, rather than into the guide portion, allows for the body of water to dampen movement of the pile 200 as it is positioned with the apparatus 1000. In other words, the water may inhibit swinging, swaying, etc. of the pile 200 during location of the pile 200 with the apparatus 1000.

Such a configuration may be useful when deploying a pile from a vessel subject to marginal or adverse weather conditions, irrespective of whether or not the guide portion 1100 or apparatus is additionally configured to mitigate acoustic emissions To assist further with deployment, the apparatus 1000 is configured to retain (and in some cases seal) the guide portion 1100 with respect to sockets 1250. Figure 8 shows a lower section of the apparatus 1000, at a socket 1250, in which complementary mating elements (in this case an annular lip 1252 and groove 1254) allow the guide portion 1100 to couple with a particular socket 1250, when the guide portion 1100 has been closed. Retaining the guide portion with the piling template in such a manner may additionally assist with ballasting the guide portion 1100, using the piling template 1200.

In some examples, the guide apparatus 1000 is configured to dewater the guide portion 1100 in a similar manner to that described above, and so displace water 500 from a gap 600 between the guide portion 110 and the pile 200. In such a manner, an acoustic barrier provided as a gas gap may be obtained between the guide portion 110 and the pile 200 to mitigate the transmission of acoustic emissions.

However, in alternative examples (and as is shown here) the guide portion 1100 may comprise an acoustic dampening structure 1800 (e.g. material) at least an inner surface thereof (e.g. dampening material configured to an acoustic barrier by providing a difference in acoustic impedance between the apparatus (e.g. the guide portion 1100) and a located pile 200, with or without the use a pump/seal.

In some such cases, when the guide portion 1100 is closed around a pile 200, the dampening structure 1800 can attenuate acoustic transmission from the pile 200 to the body of water during hammering of the pile 200 into the seabed. In some examples, the guide portion 1100 may be configured such that the dampening structure 1800 abuts against the pile 200 when located within the guide 1100. In other words, after closing the guide portion 1100, the dampening structure 1800 may interface against a located pile 200. As such, the process of closing the guide portion 1100 may be considered to be urging water from the inner annular of the guide portion 1100. In such a way, the acoustic aftenuation may be improved further.

In addition! in some examples in which the guide portion 1100 abuts against the pile, when located, then the weight (and lack of buoyancy) of the pile may be used to assist with lowering of the guide portion together with the pile into position (e.g. onto a socket).

It will be appreciated that in examples in which the dampening structure 1800 abuts against the pile 200, then an intended interface surface 1850 of the structure 1800 may be configured for reduced friction (e.g. using bristles on the interface surface 1850, or a lubricious material, such a PTFE, or the like). In such a manner, the dampening structure 1800 may contact the pile 200, yet not overly inhibit vertical movement of the pile 200 during hammering.

In some examples, the dampening structure may comprise gas-filled pockets, or the like, or closed-cell foam, or the like. In some cases, such dampening structures 1800 may be compressible against the pile 200 in order to couple to the pile 200, as well as remove any water from around the pile 200.

In the example described here, and as is shown in more detail in Figure 9, the dampening structure 1800 comprises a plurality of gas-fillable compartments, pockets or bladders 2000 (e.g. inflatable/deflatable bladders). The compartments or pockets may be fillable from a compressed gas source (e.g. compressed nitrogen, compressed air, or the like), as will be appreciated.

Here, the guide portion 1100 is configured with the plurality of bladders 2000, which are spaced both circumferentially as well as lengthwise along the inside of the guide portion 1100. In this example, and as is shown in Figure 9a, the bladders 2000 additionally comprise an outer sleeve 2100, which has an interface surface 2150 to allow reduced friction contact with a pile 200. Here, the interface surface 2150 comprises a bristles, or the like (not shown).

Figure 9a shows one axial length of bladders 2000 that depend along some or all of the length of the guide portion 1100, whereas Figure 9b shows a plan view of the guide portion 1100 showing the bladders 2000 inflated. Figure 9c shows perspective, plan and side view of an individual bladder 2000. Figure 9d shows an exemplary construction of the bladders 2000, while Figure 9e shows one exemplary column of bladders 2000.

In use, after a pile 200 has been located within the guide portion 1100, the guide portion 1100 can close around the pile 220 (e.g. in order to retain the pile 200).

Subsequently, each of the bladders 2000 can be inflated so as to couple with the pile 200, and effectively urge water from the inner of the guide portion. As the bladders are gas filled, an effective acoustic barrier (e.g. gas gap) is provided and acoustic transmission from the pile to the body of water is inhibited. It will be appreciated that in the example of using bladders 2000, or the like, then coupling the guide portion 1100 with a socket (e.g. using a lip and groove, as shown in Figure 8) may assist with any resultant uplift of the guide portion 1100 that occurs when inflating the bladders 2000, as mentioned above.

In some examples, each, some, or all of the bladders are operable independently, or at least in groups. In other words, the volume of each, some or all of the bladders may be controllable. This may assist with locating and centralising of a pile position with the guide portion.

It will further be appreciated that in some cases the bladders 2000 (or other suitable dampening structure 1800) need not couple to a located pile 200, i.e. touch, but may merely be provided (e.g. inflate) so as establish an acoustic barrier, or gas jacket, around the pile, with water remaining between the pile 200 and the dampening structure 1800. In some of those examples, the guide portion may be comprise arms, or the like, similar to those described in relation to Figure 1, for centralising the pile 200.

In any event, as before, due to the effective impedance decoupling between the pile 200 and the water 500, any acoustic emission from the pile 200 to the water (e.g. the sea) is attenuated or reflected within the guide portion 1100. In other words, the dampening structure 1800 serves to prevent, or reduce, the chance that haimful (and powerful) acoustic emissions associated with the driving of the pile 200 are communicated (or communicated to a harmful extent) to the surrounding water. As before, acoustic emissions associated with positioning (and hammering) piles can be reduced or essentially avoided altogether.

After fixing of a pile to a water floor, some or all of the bladders can be deflated, and retracted, to avoid damage as the guide portion 1100 is removed from the positioned pile.

Further examples of providing an acoustic barrier comprise configuring the apparatus 100, 1000 so as to inject gas, or gas bubbles, within the annulus of the guide portion (e.g. so as to provide a bubble jacket between a pile 200 and the guide portion, or between the dampening structure and a pile). The bubbles or gas may be injected at a single region (e.g. the lower region of the guide portion), or may be injected at different regions, circumferentially and/or axially. Compressed air may be used. In some cases, the apparatus is configured such that gas bubbles, being provided within the guide portion, are adhered or retained to or with a friction surface (e.g. between the bristles of the outer friction surface). These friction surfaces, configured to trap or retain gas bubbles, may or may not be used with additional dampening material (e.g. the bladders).

In such a manner, alternative or additional acoustic barriers can be provided within the guide portion. A skilled reader will readily be able to implement such further embodiments.

While providing a dampening structure or material on the inner side of the separable guide portion may mitigate that chances of that structure/material being subject to damage (e.g. from objects striking the apparatus), nevertheless, in some further examples, the dampening material/structure, or other such acoustic barrier, may be provided additionally or alternatively on the outer side of the guide portion.

It will also readily be appreciated that while some of the above examples of the guide apparatus 100, 1000 have been illustrated with use of a piling template 120, 1200, or the like, in further examples the guide apparatus 100, 1100 may comprise one or more guide portions 110, 1100 without the use of a piling template 120, 1200, per se. Such guide portions, or sleeves, may be used in isolation (e.g. manoeuvred and surrounding a monopile, or the like), or may be used in conjunction with further apparatus. Similarly.

in some examples the piling template may be used without the use of a guide portion.

Such embodiments will be evident given the above detailed description.

In addition, while in the above described examples, the dampening structure is described as being inflatable, it will readily be appreciated that in some examples the pockets, or the like, may be permanently gas filled (e.g. closed-cell foam, or the like).

Figure 10 shows a further example of apparatus 3000, which comprises a dampening structure or material, which may be used as an acoustic barrier. Here, the apparatus 3000 is shown having two dampening segments 3010. Of course, given the discussion below, it will be evident that in other examples more than two dampening segments 3010 may be provided. Also, in some cases, only one dampening segment 3010 may be provided.

Here, each dampening segment 3010 is configured to surround (e.g. fully surround) a pile, or the like (not shown for clarity). The apparatus 3000 is configured such that multiple dampening segments 3010 are attached so as to provide an effective height, H, of the apparatus 3000. In this particular example, each segment 3010 is 5 metres in height and so, when attached (e.g. bonded together) at a segment joint 3020, the effective height, H, of the apparatus 3000 can be considered to be 10 meters. Of course, in further example, the segments may be of a different height (e.g. 1 metre, 2 metres, etc.).

Although bonded in this example, in some alternative cases the segments 3010 may be coupled together so that segments can be readily added together and/or removed so as to vary the effective height of the apparatus 3000. In such cases, fasteners, such as loop and hook fasteners, zips, or the like may be used. In these cases, piles can be deployed in different water depths without the need for specific apparatus 3000.

In the example given, when locating a pile in water depth of around 9 metres, then two dampening segments 3010 may be used, whereas it a pile then needs to be located in water depth of around 13 metres, then a further segment 3010 may be attached (or bonded) to the first two segments so as to accommodate the change in water depth. Of course, in some examples, the apparatus 3000 can have different segment lengths (e.g. 2x 5 meters and 1x2 meters = 12 meters effective length). In some cases, as will later be described, the dampening material may be inflatable, and it may be that when deploying in different depths different segments are inflated depending on the depth. In other words, not all of the segments may be inflated.

It will be appreciated that such a modular configuration may be useful so as to avoid having to choose individually appropriate piles, supports, equipment and other tools for each site, and can readily accommodate the different ambient pressure at different depths of water.

In the example shown, the segments 3010 comprise a plurality of panels 3030 that extend around a pile, or the like. In this example, each segment 3010 has four such panels 3030 and so provides essentially a box cross-section, having an outer surface and an inner surface. Of course, in further examples, different numbers of panels 3030 may be provided.

Figure 11 shows a cross-section 3040 of one of the dampening segments 3010. The apparatus 3000 is configured such that an internal cross-section 3050 is sufficient to accommodate the cross-section of pile, or the like. It will be appreciated that the pile need not abut the inner side of the apparatus 3000. Further, it will be appreciated that water may be present between the apparatus and a pile, and yet the acoustic barrier can still be provided.

In some examples, one, some or all of the segments 3010 may be configured to be opened and closed and so as to surround a pile, or the like (e.g. opened and closed lengthwise so as to surround a pile), in a similar manner to that described above.

Figure 12 shows a cross-section of such a segment 3010, in the closed configuration.

Here, the segment 3010 is elastically deformable, and can be opened along its length at an opening 3065, so as to allow a pile to be introduced in a similar manner to that described above. Here, the segment 3010 can be fixed in a closed configuration for example, using fasteners 3070, such as look and hoop fasteners, zips, lacing, or the like. In the example shown in Figure 12, the segment 3010 is fixable at an inner side and an outer side of the segment 3010.

As can be seen, the interface at the opening is specifically configured to such that any water pathway across the opening in minimised. In other words, the opening is configured so that, when closed, the segment nevertheless provides a barrier around the pile (i.e. substantially without having a gap).

While the above segments 3010 may comprise dampening material (e.g. deformable foam, or the like), in other examples, the segments 3010 can be inflatable (e.g. inflatable using compressed air). In those cases, the segments 3010 can be specifically configured such that, when inflated, they adopt the surrounding configuration (e.g. the box cross-section).

Figure 13 shows an example in which the internal cross-section of the segment 3010.

The, or each segment comprises or defines one or more outer surfaces 3017. The surface(s) 3017 define or form a relationship, e.g. a fixed relationship, to one another.

The, or each segment 3010 comprises a specific material 3075, structure or fabric, having a particular orientation across the segment. The specific material 3075.

structure or fabric is comprised in each/the segments 3010 and/or between the surface(s) 3017 of each/the segment(s). In this example, the specific material 3075 is permeable to fluid (e.g. air). The specific material 3075 is configured to define an orientation and/or relationship of the surfaces 3017 with respect to one another. The specific material 3075 defines or comprises an internal structure 3075. The internal structure may provide rigidity of the surfaces(s) and/or each/the segment(s) when pressurised or inflated. The internal structure may define or pre-determine the shape and/or form of the/each segment(s) when pressurised or inflated. In some examples, the internal structure is comprised or provided in one or more layers or sheets, e.g. discrete layers, of the segment.

The internal structure 3075 can be orientated radially to an axial centre line 3077, as shown in Figure 13. In other examples, the internal structure can be orientated symmetrically, linearly, tangentially, with respect to the axial centre line 3077 of the apparatus 3000. As can be seen in Figure 13, the inner structure 3075 can be considered to be a thread type or fibrous fabric orientated so as to provide the orientation between the surfaces 3017. In some examples, the thread type fabric defines or is comprised in a woven and/or a drop-stitch type arrangement. The thread type material is orientated appropriately such that the threads are provided radial, symmetrical, linear and/or tangential to the centre line 3077. In such a manner, the segment 3010 can be configured to adopt a particular desired shape or configuration when inflated and/or pressurised. In addition, the outer surfaces 3017 of the segment 3010 can be substantially rigid, when inflated.

The segment 3010 can therefore be considered to have inner material 3075 or structure that acts perpendicularly to some or all the surfaces 3017 of the segment 3010 so as to provide a desired configuration of segment 3010. Alternatively or additionally, the inner structure 3075 can be provided diagonally, slanted and/or at one or more angle(s) with respect to some or all surfaces 3017 of the segments 3010. This also provides an effectively rigid surface, when inflated.

When deflated, the segment 3010 can also adopt (or be permitted to adopt) a stowable configuration (e.g. for storage on a vessel of the like). In some cases, the deflated segment 3010 can adopt a substantially planar configuration, as is shown in Figure 14.

In such examples, the segments (and overall apparatus 3000), when deflated, can be stackable on a vessel. Providing such a configuration allows for efficient use of space on a vessel, and so can reduce costs.

In examples in which the segments 3010 are openable and closable then the segment may be configured such that, when inflated, the segment 3010 is bias to adopt the closed configuration. In other words, the segments 3010, when inflated, can urge the length-wise opening of the segment 3010 together so as to provide the closed configuration. In some examples! and as is shown in Figure 15. the segment 3010 may comprise complementary retaining elements 3080. For example, the segment 3010 may have one more lugs 3080a and recesses 3080b. When deflated, the lugs 3080a may be readily insertable into the recesses 3080b. However, when inflated, the lugs 3080a may be forcibly secured within the recess 308Db.

To assist with deployment of the apparatus 3000, in some example the apparatus 3000 may comprise anchor points 3100, as shown in Figure 16. The anchor points 3100 can be provided at a lower section of at least one segment 3010. In some examples, the anchor points 3100 may be configured or at least used to couple the apparatus 3000 to a water floor (e.g. sea bed). Here, the anchor points are suitable for use with a D ring and clip type connection to a steel pad eye, or the like. In further examples, the anchor points 3100 may permit the attachment of ballast weight, or the like (e.g. ballast configured to overcome any reactant uplift from an inflated series of segments 3010).

In further examples, the apparatus 3000 may comprise rigging sections 3110, configured to attach each segment 3010 to a support rigging 3120, as is shown in Figures 17a and 17b. Here, the rigging sections 3110 extends as a webbing from an interface between panels of each segment 3010. The support rigging 3120 can be fixed to the water floor, as shown, and tensioned to provide additional support to the apparatus 3000. Such configurations may be useful in, for example, strong currents.

In use, multiple segments 3010 can be inflated and deployed around a pile (e.g. open and closed) depending on the desired depth. The pressure of each dampening segment 3010 may be provided independent of other segments 3010. For example! the segments 3010 may be configured to be pressurised to roughly 0.6 bar above ambient pressure for the intended depth of that segment. In some cases, the some or all of the dampening segments 3010 may comprise relief values 3200, as shown in Figuie 18, configured release pressure above a particular threshold (e.g. 0.75 bar above ambient). Fuither, in some examples, the segments may be inflated around a pile so as to abut against and grip the pile, to allow the weight (or lack of buoyancy) oi the pile to assist with lowering to a seabed, or the like.

Referiing to Figures 19 a and 19 b, the segment 3010 comprise a number or plurality of layers or sheets 3015, e.g. a number of discrete layers 3015. The number of layers 3015 can be varied so as to increase or decrease a width A of the/each segnient 3010.

A/each layer 3015 of the number of layers is arranged or positioned in a lateral direction with respect to the apparatus 3000 and/or pile. For example, each layer 3015 extends lengthwise along each/the segments 3010, apparatus 3000 and/or pile.

Alternatively or additionally, each layer 3015 of the number of layers extends circumferentially with respect to each/the segment 3010, apparatus 3000 and/or pile. In some examples, the number of layers is coaxially and/or concentrically arranged! e.g. each layer 3015 of the number of layers is arranged coaxially or concentrically to one another within each/the segment(s) 3010. In other examples, each layer 3015 of the numbers of layeis is arranged or positioned so as to suiiound at least a portion of one another. As shown in the example of Figures 19 a and 19 b, the layers 3015 can be coupled, laminated and/or bonded togethei.

As can be seen in Figure 19 b, each layer 3015 of the number of layers defines or comprises a width or thickness B. In some examples, the/each layer 3015 of the number of layers has substantially the same width B. In other examples, the/each layer 3015 of the number of layers has a different width B. The width B of the/each layer 3015 can be varied so as to dampen, absorb and/or attenuate acoustic pressure waves. By providing the segment 3010 with a number of layers 3015 one or more differences in acoustic impedance between the layers 3015 and/or apparatus 3000 and surrounding water are provided and/or controllable.

The/each layer 3015 of the number of layers defines or comprises the damping material 3025. The damping material 3025 dampens, absorbs and/or attenuates acoustic waves, e.g. acoustic pressure waves. The damping material 3025 can provide one or more differences in acoustic impedance between the layers 3015 of each/the segment(s) 3010 and/or the apparatus 300 and surrounding water. In some examples, the/each layer 3015 of the number of layer comprises the same damping material 3025. In other examples, the/each layer 3015 of the number of layers may comprise a different damping material 3025. The damping material can be deformable, flexible and/or compressible. As seen in Figures 19 a and 19 b, the number of layers define or provide a sequence, series or order of damping materials 3025, arranged so as to provide effective dampening, absorption and/or attenuation of the acoustic waves. For example, the damping material 3025 comprises bulk insulating materials, e.g. visco elastic materials, concrete, woodwool, glasswool or the like.

As can be seen in Figures 19 a and 19 b, each/the segment 3010 can comprise one or more space(s) or gap(s) 3027. The gap(s) 3027 are formed or extend between neighbouring or adjacent layers 3015 of the number of layers. Nthe gap(s) 3027 extend, e.g. laterally extend, between the layers 3015. The layers 3015 can be arranged or positioned in the segment 3010 and/or apparatus 3000 so as to form the gap(s) 3027. The gap(s) 3027 define or comprise a width or thickness C. The width C of the gap(s) can be controlled by positioning or arranging neighbouring layers 3015 with respect to another. In some examples, the width C of some or all gaps is substantially the same. In other examples, the width C of some or all gaps 3027 varies or differs. In some examples, the gap(s) 3027 extend circumferentially between the layers 3015 of each/the damping segments 3010. Alternatively or additionally, the gap(s) 3027 extend lengthwise along the layers 3015 of each/the segment(s) 3010.

In some examples, the gap(s) 3027 comprise or are filled or fillable with, e.g. in use, a further material (not shown). The further material provides or acts as an (additional or further) acoustic barrier. Alternatively or additionally, the further material can be configured to provide a difference in acoustic impedance between the layers 3015 of each/the segment(s) 3010 and/or the apparatus 3000 and the surrounding water. In some examples, the further material comprises a fluid, gas, e.g. air, or liquid, e.g. water, sea water or brine. In other examples, the further material alternatively or additionally defines or comprises an elastic and/or porous material or foam or the like.

The material can be configured to join or bond the layers 3015 of each/the segment(s) 3010. The material can be flexible, deformable and/or compressible. In some examples, the material is applied in the gap(s) 3027 between the layers 3015 of each/the segment(s) 3010. Alternatively or additionally, the material is applied to and/or on one or more surface(s) 3017. such as one or more outer surface(s) 3017, of the each/the segment(s) 3010. By providing a further material in the gap(s) 3027 between the layers 3015 of each/the segments 3010 dampening, attenuation and/or absorption of acoustic waves can be influenced and/or controllable.

In some examples, the gap(s) 3027 comprise bubbles, such as liquid or gas bubbles (not shown). A system (not shown) for forming bubbles and/or a bubble curtain is provided and/or positioned within the gap(s) so as to provide the bubbles. The bubbles system can be integral with a portion of one or more of the layers 3015 and/or segment(s) 3010. Alternatively, the bubble system can be provided separately from the layers 3015 and/or segment(s) 3010. The bubbles or bubble curtain provides an acoustic barrier and/or cause a difference in acoustic impedance between the layers 3015 and/or segment(s) 3010. By providing bubbles within the gap(s) 3027 between the layers 3015 and/or segments 3010 the dissipation of bubbles due to strong water currents can be decreased. Alternatively or additionally, the bubble system is be provided andlor positioned outside of the apparatus 3000.

The number of layers 3017 of each/the segment can divert or influence one or more transmission paths of acoustic waves. For example, acoustic waves from a pile surface reach a first layer 3017 of the segment 3010 and are reflected, e.g. partially reflected, due to the impedance difference provided between the layers 3017 of the segment 3010. The acoustic waves can actuate a vibration or oscillation of the first layer so as to produce or provide acoustic waves within the first layer 3017. The acoustic waves created within the first layer 3017 can be reflected or partially reflected by a second layer 3017, which can be arranged subsequent to the first layer in on or more transmission paths of acoustic waves.

In some examples, the one or more segments 3010 define an arrangement of segments 3010. Each/the segments 3010 of the arrangement are arranged so that the one or more segments substantially surround a pile. Each/the segment(s) 3010 of the arrangement may be arranged or positioned in a lateral direction. The segments 3010 can be coaxially and/or concentrically arranged, e.g. the one or more segment(s) 3010 are arranged coaxially or concentrically to one another. In some examples, the segment(s) 3010 are arranged or positioned so as to surround at least a portion of one another. Each/the segment 3010 of the arrangement defines or comprises one or more discrete segment(s).

In some examples, each/the segment 3010 of the arrangement of segments defines or comprises a width or thickness A. The width or thickness A of some or all segments is substantially the same. Alternatively, the width or thickness A some or all segments 3010 is different. In some examples, the width A of the segment(s) 3010 increases from the inner to the outer of the apparatus 3000. Alternatively, the width A of the segment(s) 3010 decreases from the inner to the outer of the apparatus 3000. For example, segments 3010 positioned in the inner of the apparatus 3000 comprise a smaller width A than segments 3010 positioned in the outer of the apparatus 3000.

Alternatively, segments 3010 positioned in the inner of the apparatus 3000 comprise a larger width A than the segments positioned in the outer of the apparatus. By providing the segments of the arrangement with varying widths dampening, attenuation and/or absorption of acoustic waves can be influenced and/or controllable.

After the pile has been located, the apparatus can be removed and deflated and readily stacked for further use.

It will be appreciated that the above described apparatus 3000 may additionally be used with the piling template shown, for example in Figures 5 to 9, etc. For example, the one or more segments may be used with the piling template, and may be configured to move between sockets, as will be appreciated by the skilled reader.

Although not described in detail, it will readily be appreciated that the apparatus 1000, 3000 of any of the Figures 6 to 9 or 10 to 19 may also have any of the features described in relation to the apparatus 100 of Figures 1, 2, 4 or 5, and vice versa. For example, in some cases, the guide portion 1100 additionally comprises, arms, vanes or radial members, for example, in addition to dampening structure such as bladders, foam, etc. (some or all of which may be configured to mitigate any acoustic transmission between the pile 200 and the apparatus 1000, 3000), which extend inwardly from the guide portion and assist with locating the pile within the guide portion when being closed around a located pile 200. Such arms, vanes, etc., may addition mitigate the chance of excessive wear or damage to the dampening structure 1800. In addition, in some examples, the guide portion additionally comprises outer dampening material to assist further with the attenuation of acoustic emissions. These, and other such alternative embodiments, will readily be able to be implemented by a skilled reader.

While in this specification the term, "offshore", has been referred to, it will be understood that this term is not to be considered to be limited to at sea, but rather offshore can refer to any region or expanse of water, such as, seas, lochs, lakes, forths, estuaries, etc. Some examples of the apparatus may be useful in water depth of at least 40, 50, 60 metres or even greater. Further, while it has been helpful to describe the above exemplary embodiments in relation to installing supporting piles, or like, for wind turbine assemblies, it will readily be appreciated that the invention is also useable when constructing other structures offshore, including bridges, harbours, coastal walks, oil and gas structures, or the like. In those cases, the above apparatus may be used for securing piles, or other apparatus that are not piles, as such, but nevertheless are secured to a seabed or the like using a hammer, or other such device that would cause unwanted acoustic emissions. A skilled reader will readily be able to implement those alternative embodiments.

The applicant discloses in isolation each individual feature described herein and any combination of two or more such features, to the extent that such features or combinations are capable of being carried out based on the specification as a whole in the light of the common general knowledge of a person skilled in the art, irrespective of whether such features or combinations of features solve any problems disclosed herein, and without limitation to the scope of the claims. The applicant indicates that aspects of the invention may consist of any such individual feature or combination of features. In view of the foregoing description it will be evident to a person skilled in the art that various modifications may be made within the scope of the invention.

Claims

CLAIMS1. Guide apparatus comprising a dampening structure configured to provide an acoustic barrier between a pile and a surrounding body of water during deployment of a pile at or in a body of water, wherein the dampening structure comprises one or more dampening segments, the/each dampening segment comprising a number or plurality of layers and/or sheets and/or spaces.
2. Apparatus according to claim 1, wherein the dampening structure comprises a plurality of fluid or gas fillable or gas filled fluid bladders, optionally configured to inflate and/or deflate.
3. Apparatus according to any preceding claim, wherein each dampening segment is configured to surround a pile.
4. Apparatus according to any preceding claim, wherein the/ each segment r comprises a number or plurality of discrete layers or sheets. a)
5. Apparatus according to claim 4, wherein the number of layers is selectable so as to increase or decrease a width of the/each segment.
6. Apparatus according to claim 4 or 5, wherein the number of layers is coaxially and/or concentrically arranged, such as each layer of the number of layers is arranged coaxially or concentrically to one another within each/the segment(s).
7. Apparatus according to claim 4 to 6, wherein, the/each layer of the numbers of layers is arranged or positioned so as to surround at least a portion of one another.
8. Apparatus according to claims 4 to 7, wherein the/each layer of the number of layers defines or comprise a width or thickness.
9. Apparatus according to claim 8, wherein the width of the/each layer is selectable so as to dampen, absorb and/or attenuate acoustic waves.
10. Apparatus according to claims 4 to 9, wherein the/each layer of the number of layers defines or comprises a damping material.
11. Apparatus according to claims 1 to 10, wherein each/the segment defines or comprises one or more space(s) or gap(s).
12. Apparatus according to claim 21, wherein the gap(s) comprise or are filled or fillable with a further material, in use.
13. Apparatus according to claim 12, wherein the further material comprises a fluid, gas, such as air, or a liquid, such as sea water or brine.
14. Apparatus according to claim 12 or 13, wherein the further material defines or r comprises an elastic and/or porous material, or foam.
15. Apparatus according to claims 11 to 14, wherein the gap(s) comprise bubbles, such as fluid or gas bubbles.
16. Apparatus according to claim 15, wherein a system for forming bubbles and/or a bubble curtain is provided and/or positioned within the gap(s) so as to provide the bubbles.
17. Apparatus according to claims 1 to 16, wherein the one or more segments define an arrangement of segments.
18. Apparatus according to claim 17, wherein each/the segments of the arrangement is arranged so that the one or more segments substantially surround a pile.
19. Apparatus according to claims 1 to 18, wherein the/each segment comprises or defines one or more surface(s), such as one or more outer surface(s).
20. Apparatus according to claim 19, wherein the surface(s) define or form a relationship, such as a fixed relationship, to one another.
21. Apparatus according to claim 19 or 21, wherein the/each, segment comprises a specific material, structure or fabric, having a particular orientation across the segment, the material being permeable to fluid.
22. Apparatus according to claim 21, wherein the specific material is configured to define an orientation and/or relationship of the surface(s) with respect to the one another.
23. Apparatus according to claim 21 or 22, wherein the specific material defines or comprises an internal structure. r

Q)
24. Apparatus according to claim 23, wherein the internal structure provides rigidity of the surfaces(s) and/or each/the segment(s) when pressurised or inflated.
25. Apparatus according to claim 23 or 24, wherein the internal structure defines or pre-determines the shape andlor form of the/each segment(s) when pressurised or inflated and optionally, wherein the internal structure is comprised or provided in one or more layers or sheets of the segment.
26. Apparatus according to claims 23 to 25, wherein the internal structure is orientated, such as orientated radially, symmetrically, linearly, tangentially, with respect to an axial centre line of the apparatus.
27. Apparatus according to claims 23 to 26, wherein the inner structure is considered to be a thread type or fibrous fabric orientated so as to provide the orientation between the surface(s).
28. A method for deploying an offshore pile at an offshore site, comprising: locating an offshore pile with the apparatus according to any preceding claim at an offshore site and providing an acoustic barrier between the pile and a body of water, and securing the pile to a water floor at the offshore site.
29. A method according to claim 28, the method comprise varying, such as increasing or decreasing, a width of one or more segment by varying, such as increasing or decreasing, a number of layers or sheets provided or comprised within each/the segment. r

Q)
30. A method according to claim 28 or 29, the method comprising arranging the layers so that one or more gap(s) may be formed between neighbouring or adjacent layers.
31. A method according to claim 30, the method comprising filling the gap(s) with a further material.
32. An apparatus, such as a guide apparatus, for a pile, such as an offshore pile, the apparatus comprising a dampening structure or material.
33. Guide apparatus comprising a dampening structure configured to provide an acoustic barrier between a pile and a surrounding body of water during deployment of a pile at or in a body of water, wherein the dampening structure comprises one or more dampening segments, the/each dampening segment comprising a specific material, wherein the specific material comprises an internal structure pre-determining a shape and/or form of each/the dampening segments when pressurised or inflated.
34. Apparatus according to claim 33, wherein the internal structure provides rigidity of one or more surfaces(s) and/or each/the segment(s) when pressurised or inflated.
35. Apparatus according to claim 33 or 34, wherein the internal structure is comprised or provided in one or more layers or sheets, such as discrete layers, of the segment.
36. Apparatus according to claims 33 to 35, wherein the intemal structure is orientated, such as orientated radially, symmetrically, linearly, tangentially, with respect to an axial centre line of the apparatus.
37. Apparatus according to claims 34 to 36, wherein the inner structure acts perpendicularly to some or all the surface(s) of the segment so as to provide a desired r configuration of segment. a)
38. Apparatus according to claims 34 to 37, wherein the inner structure is provided diagonally, slanted and/or at one or more angle(s) with respect to some or all surface(s) of the segment(s).
39. An apparatus as hereinbefore described with reference to the accompanying drawings.
40. A method as hereinbefore described with reference to the accompanying drawings.