The present invention relates to a hose arrangement for creating a bubble curtain in bodies of water according to the preamble of claim 1.
A hose arrangement of this type is utilized, in particular, as a noise barrier upon hammering a pole into the bottom of a body of water. Using such a hose arrangement a so-called large bubble curtain is created. To that end, an air hose is deployed around the construction site and affixed to the bottom of the body of water, the air hose is supplied with pressurized air via at least one compressor, the air hose being equipped with a plurality of holes or punctures across its length. The pressurized air will leak through the punctures thereby creating a bubble curtain rising up from the air hose. This bubble curtain of air bubbles forms a physically-acoustically absorbing barrier for the sound waves occurring during hammering. The primary purpose of the bubble curtain is to protect marine mammals with sensitive hearing such as porpoises and seals from hearing damage.
While, in the early stages of development of the large bubble curtain system, the air hoses still had to be affixed by divers at the bottom of the body of water and, following conclusion of the hammering works, were either given up and left at the bottom of the body of water or had to be removed by divers again, nowadays the air hoses are positioned by means of a pipe-laying vessel. On these ships the air hose is wound up or reeled respectively on a winch from which the air hose is wound off via the stern of the ship and placed onto the bottom of the body of water in the shape of a ring around the construction site. In an embodiment known in the art, metal sleeves are arranged at the air hose at certain distances across the entire length of the air hose which are interconnected via a chain. The sleeves and the chain serve, on the one hand, as ballast so that the air hose filled with air in operation stays at or, respectively, remains affixed to the bottom of the body of water, and, on the other, may function as tension member for absorbing the tension forces occurring upon pipe-laying and recovering the lines.
The above-described state of the art wherein sleeves and chains are utilized as ballast bears the disadvantage that the chain may impede the introducing and recovering of the air hose in the body of water. Moreover, the sleeves in contact with the air hose may lead to damage of the air hose by scrubbing and bending. Further, the hoses, sometimes reinforced by steel mesh inlays or similar, can only be drilled conventionally, strongly limiting the variability of the holes or, respectively, slits introduced therein.
In the document DE 20 2013 100 564 U1 a hose arrangement is described, wherein, in one embodiment, an air hose is utilized which is made from a rubber or a polymer. To increase tensional strength and compressive strength the air hose is provide with a fabric layer or, respectively, mesh wire inlay. The wall of the air hose comprises a plurality of bores or holes respectively. These have a diameter of about 0.5 to about 5 mm and are spaced apart from one another by about 100 cm to about 10 cm. To prevent buoyancy of the air-filled hose in water a weight element is introduced in the air hose in the form of a chain. In contrast to a chain arranged on the outside the chain arranged within the air hose does not impede the winding properties of the air hose so that great lengths of the air hose can be placed on a winding device. However, the chain arranged within the air hose impedes the air flow within the air hose and facilitates water entering through the bores in the wall when the pressurized air flow is switched off.
In the printed publications addressing this type of apparatus, WO 2014 045 231 A2 and WO 2018/157884 A1, this disadvantage is overcome in that the air hose is connected to a ballast receptacle in a connecting region below a lower crown area and the weight element is received in this ballast receptacle whereby the air flow in the air hose is no longer impeded and it is possible to wind up and hold the hose arrangement at the bottom of the body of water.
In all aforementioned embodiments the air hose is usually made of rubber or other polymer materials and the wall is reinforced by at least one additional fabric layer to make the air hose more pressure stable and, most of all, to guarantee sufficient tensile strength to avoid damage to the air hose caused by tension forces occurring in operation. An air hose of this type must then be processed accordingly by mechanical or chemical or thermal means in order to connect it to the ballast hose, and this requires an additional processing step potentially damaging the air hose or at least impeding the discharging of air bubbles.
The citation DE 20 2014 005 397 U1 describes a further option of forming a bubble curtain as a noise barrier in the case of a pole to be hammered into the bottom of the sea. Hereby, the pole is surrounded by a structure, with a bubble curtain provided in the gap between the structure and the pole. The structure consists of a packet of rings interconnected by a textile fabric. The rings and the textile fabric form a hose surrounding the pole. This air hose forms a type of cage through which the current of the sea water in the gap between the hose and the pole is reduced.
It is the object of the present invention to provide a hose arrangement of this type which eliminates the disadvantages of the state of the art mentioned previously, in particular, affixes the air hose to the ballast element in a simple manner and possibly protects it well from outside forces while allowing a regular bubble curtain to be provided.
This task is solved according to the invention by a hose arrangement according to claim 1. The sub-claims specify preferred further developments.
Thus, according to the invention, a hose arrangement for creating a bubble curtain in bodies of water is provided, wherein the air hose is jacketed, preferably across its entire longitudinal extension or length respectively or at least across 75% of its length, by a support sheath comprising material bars and intermediate openings, the air hose being connected to the ballast receptacle via the support sheath, and preferably exclusively via this, in a connecting area, and the openings being positioned at least in the first circumferential area of the air hose to allow discharge of air from the perforation in the air hose.
Thus, an additional sheathing of a mesh type or provided with openings is provided as “connecting element” between the air hose and the ballast receptacle. By virtue of its openings this does not impede the air bubbling out of the air hose and, at the same time, can support the air hose securely in that it jackets the same thereby preventing buoyancy of the air hose when pressurized. Then, the support sheath can be connected to the ballast receptacle with lesser requirements and may even form part of it according to one embodiment without affecting the air hose itself, because the mechanical and/or thermal and/or chemical effects actions to form the connection do not affect the air hose itself because the support sheath is preferably not part of the air hose itself.
According to a first embodiment, it is provided to form the support sheath by a web of interconnected fibers, in particular, textile or mineral fibers, which form the material bars, and mesh-type openings in between. This makes for a sheathing that is simple to produce or, respectively, readily available and affordable which, by virtue of its mesh-type form is suited for receiving and supporting the air hose and, moreover, is available in various shapes and for diverse requirements, also considering its application in water.
Further, preferably, it is provided that lower ends of the web are affixed, in particular, clamped therein, to the ballast receptacle in the connecting area. This allows for a simple connection to the ballast receptacle to be made thereby simplifying the assembly process.
According to a first embodiment, it is provided that the support sheath is formed by a first partial area of a polymer band, preferably made of a fabric layer reinforced polymer, which is folded back onto itself thereby jacketing the air hose, the polymer band in the first partial area being provided with cutouts, in particular, cut out or punched out, such that openings are formed in-between material bars which, in the folded back state of the first partial area, are positioned at least in the first circumferential area of the air hose so as to allow air to be discharged from the perforation in the air hose. This provides for an alternative option for the support sheath, wherein the openings and material bars can be purposefully adapted to the application and also the dimensions of the air hose as well as of the ballast element. Hereby, it is simple to introduce the openings into a suitably cut back polymer band, for example, in a punching process, whereby various shapes of the openings are possible. In the alternative, the material bars may be later joined to the polymer band in the first partial area, for example, adhesive bonding. Thus, in this case, the first partial area of the polymer is designed in two parts.
Hereby, it may be additionally provided for the first partial area of the polymer band to essentially fully cover a second circumferential area of the air hose, the second circumferential area preferably being unperforated. Thus, in contrast to a web as support sheath, circumferential areas of the air hose not necessarily exposed may remain covered so that these are protected from damage, in particular, during transport or upon installation of the hose arrangement at the bottom of the sea.
Preferably, it is further provided for the ballast receptacle to be formed by a second partial area of the polymer band which is folded back onto itself so as to form the receiving area and receive the ballast element, the first partial area and the second partial area being designed as one piece. Thus, a one-piece design of the ballast receptacle (second partial area) as well as the support sheath (first partial area) may be provided, where the partial areas, by means of folding back onto themselves or turning respectively and by means of a subsequent joining process, form spaces or receiving areas respectively for the air hose or the ballast element respectively. Hereby, an exactly pre-configured one-piece solution can be provided which is suitable for being assembled at first at the point of destination by respective turning, thereby simplifying both transport and assembly (and even dis-assembly).
However, in the alternative, it may be provided for the ballast receptacle to be formed by a deformable, panel-shaped element (similar to the second partial area of the polymer band) the edge regions of which are folded loop-like back onto themselves in such a manner that a hose shape with a receiving area extending in the longitudinal direction is created, in which the ballast element is received, where the edge regions of the panel-shaped element are connected in the connecting area to the support sheath. Thus, in contrast to a one-piece solution of the second embodiment example, a two-piece solution is also conceivable which can then be combined with a web or a polymer band (comp. first partial area) as support sheath to form the hose arrangement.
Preferably, it is further provided for connector means to be arranged between the support sheath and the ballast receptacle, the connector means being designed, in particular, as a screw connection and/or a rope-type or a band-type connector means and/or nails and/or rivets and/or pilot bolts. Advantageously, these should guarantee that the ballast receptacle is connected to the respective support sheath or, respectively, that in the second embodiment example the adhesion of the hose arrangement folded back onto itself in the respective partial areas is guaranteed.
Preferably, it is further provided for the support sheath to lie fully in loose contact with the air hose or the support sheath to be connected to the air hose merely in certain areas, for example, at the ends and/or at intermediate positions, in particular, via a substance-to-substance bond, e.g., a PU adhesive, or by means of a positive-locking and/or frictional connection, for example, a clamp or a rivet connection. Hereby, it can be guaranteed that the air hose does not become twisted or distorted or shifted in the longitudinal direction in the support sheath when this is installed at the bottom of the sea, exposed to sea currents or alternates between the pressurized and the unpressurized states.
Preferably, it is further provided for the hose arrangement to comprise a plurality of air hoses, with always two air hoses adjacent one another in the longitudinal direction being connected in a sealing manner via a hose coupling. Hereby, a variable design of the hose arrangement can be attained, where the support sheath may also be continued via the hose coupling depending on the design.
The invention is further illustrated in the following by means of embodiment examples. The accompanying drawing shows in:
When building offshore installations such as wind turbines, poles 1 or pipes are driven into the bottom of the sea 3 by means of a hammering means 2 creating a large amount of noise. Marine mammals such as porpoises may suffer damage from the sound waves transmitted underwater. In order to avoid this a bubble curtain BC (Bubble Curtain) is created during the hammering works around the pole 1 to be driven by means of which the physical characteristics of the water are changed. This breaks sound waves multiple times thereby reducing the volume.
Here, to generate the bubble curtain BC, a hose arrangement 100 comprising an air hose 4 capable of being supplied with pressurized air is placed at the bottom of the sea 3 in a ring shape around the pole 1 to be hammered in, to that end, a supply vessel 5 sails around the pole 1 in an approximately circular course, thereby winding off the hose arrangement 100 including the air hose 4 of a winding winch 6 arranged on board the supply vessel 5. On board the supply vessel 5 there is also at least one special compressor 7 utilized to press pressurized air into the air hose 4 of the hose arrangement 100. The pressurized air may be pressed in from one end of the air hose 4 or even from both ends of the air hose 4.
A first embodiment of the hose arrangement 100 oriented in a longitudinal direction X is shown in
In the first embodiment according to the
On the underside the hose arrangement 100 in both embodiment examples comprises a ballast receptacle 20 for a ballast element 21 also extending in the longitudinal direction X by means of which the hose arrangement 100 can be secured at the bottom of the sea 3. Preferably, a connection between the air hose 4 and the ballast receptacle 20 is attained merely via the support sheath 10 so that the air hose 4 itself does not require additional extensive thermal and/or chemical and/or mechanical treatment. Merely by way of support, at certain points, e.g., at the ends and at selected intermediate positions, an additional adhesive connection may be provided, e.g. via a PU adhesive, between the support sheath 10 and the air hose 4 so as to avoid slipping or twisting of the air hose 4 within the support sheath 10. In addition or as an alternative hereto, at certain points a frictional and/or positive locking connection may be provided between the support sheath 10 and the air hose 4, for example, by means of a clamping connection or a rivet connection, for example, via a pop rivet penetrating the support sheath 10 and the air hose 4.
In
To that end, according to
Hereby, the punctures 9a or the perforation 9 are or, respectively, is introduced into the wall 4a in a first circumferential area B1 (see
The opening width or, respectively, the size of the individual punctures 9a may also vary in the longitudinal direction X of the air hose 4, for example, to compensate for pressure drops caused by interior friction of the compressed air, for example, due to larger opening widths of the punctures 9a, towards the end of the air hose 4. Thus, the air hose 4 may even be composed of partial areas having differing puncture sizes or, respectively, opening widths. In that case the perforation 9 is will be designed such that the compressed air may still bubble up via the air hose 4 (in the longitudinal direction X) evenly even under varying water pressure levels in the environment U caused by differences in level of the bottom of the sea 3.
The respective support sheath 10 surrounds the air hose 4 both in the first circumferential area B1 and the second circumferential area B2, whereby, due to the openings 10b (punch-outs or meshes) in the support sheath 10, the above-described discharging of the air bubbles in the first circumferential area B1 will not be significantly affected. To that end, the openings 10b are preferably positioned in the support sheath 10 such that the air hose 4 will be exposed extensively, at least in the first circumferential area B1, and the material bars 10a cover merely smaller areas of the air hose 4 of the perforation 9 respectively, so that the creation of a bubble curtain BC will not be noticeably affected.
While the punch-outs (openings 10b) in the polymer band 13 of the second embodiment example according to
The transition between the support sheath 10 and the ballast receptacle 20 will vary depending on the embodiment. In the first embodiment according to the
The edge areas 20b of the folded-back element 20a enclose between them the lower ends 14a, 14b of the web 12 in the connecting area 15 essentially across the entire length L of the air hose 4. For mutual detachable attachment a connector means 16 is provided which, in this case, is formed by a screw connection 16a, the screws are inserted through connection holes 18 in the edge areas 20b as well as through the openings 10b or meshes respectively of the web 12. This makes the lower ends 14a, 14b of the web 12 become jammed in-between the edge areas 20b and also prevents the web 12 from being pulled off from the edge areas 20b due to the mesh-type structure of the web 12. Alternatively, a similar connection via pins or rivets or pilot bolts 16c (see
Both in case of a screw connection 16a and a rope-shaped or band-shaped connector means 16b it is possible to detach the connection between the two in a simple manner. This simplifies the assembly and disassembly or, respectively, a replacement of individual components of the hose arrangement 100, for example, in case of a defect of the respective component of the hose arrangement 100.
In the second embodiment according to the
In principle, the polymer band 13 may also be designed in two pieces, where, then, a separation into two partial bands happens in the middle area 13c. The two partial bands or, respectively, partial areas 13a, 13d which, then, each comprise connection holes 18 at the edges, will then be joined in the connecting the area 15 by suitable connector means 16 via the connection holes 18, in a manner similar to the first embodiment.
In all embodiments described here, the hose arrangement 100 may consist of a plurality of air hoses 4 in segments joined via a hose coupling (not shown). Thereby, a hose arrangement 100 can be provided consisting of a plurality of air hoses 4 joined in segments. Hereby, it may be provided for the support sheath 10 to extend across the hose coupling and/or being clamped in jointly with the hose coupling so as to prevent slippage of the air hose 4 in relation to the support sheath 10.
Number | Date | Country | Kind |
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21192607.6 | Aug 2021 | EP | regional |