Key information

Title
Subsea foundations
Application number
20231049
Case type
National
Status
08.09.2025 Patent meddelt (B1)
Filed
02.10.2023
Effective date
02.10.2023
Publicly available
03.04.2025
Next annual fee due
31.10.2027
Applicant
Subsea 7 Norway AS (NO)
Owner
Subsea 7 Norway AS (NO)
Inventor
Christian Linde Olsen (NO)
Agent
BRYN AARFLOT AS (NO)
Granted
08.09.2025
Patent number
349061
Expiry date
02.10.2043

Abstract and drawing

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.
A subsea foundation for anchoring a mooring line comprises a mooring base such as a chain that is simply laid upon the seabed in a straight, curved or looped configuration, hence extending across the seabed substantially parallel to the seabed. The mooring base is then anchored by one or more deadman anchors that are embedded in the seabed soil. For this purpose, one or more links extend through the soil to couple the mooring base to the or each deadman anchor. One or more mooring lines can then be coupled to the mooring base.

Publications

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Documents

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Date
 Date Doc. No. Process Case number In/Out Journal description To/from
 15.09.2025 11-01 Saksbehandling 20231049(349061) UT PT Registreringsbrev nasjonal patent (15) (PT20231049)
02.09.2025 10-01 Saksbehandling 20231049 UT PT Varsel om betaling av første årsavgift (3317) (PT20231049) BRYN AARFLOT AS
 13.06.2025 09-01 Saksbehandling 20231049 UT Intention to grant BRYN AARFLOT AS
 04.06.2025 08-06 Saksbehandling 20231049 INN Response NIPO_OA2_5th June 2025 BRYN AARFLOT AS
 04.06.2025 08-05 Saksbehandling 20231049 INN P74906NO specification - Amended for OA2 response - marked BRYN AARFLOT AS
 04.06.2025 08-04 Saksbehandling 20231049 INN P74906NO specification - Amended for OA2 response - clean BRYN AARFLOT AS
 04.06.2025 08-03 Saksbehandling 20231049 INN P74906GB Drawings for filing BRYN AARFLOT AS
 04.06.2025 08-02 Saksbehandling 20231049 INN 144075NO_Norwegian Claims BRYN AARFLOT AS
 04.06.2025 08-01 Saksbehandling 20231049 INN Korrespondanse (Hovedbrev inn) BRYN AARFLOT AS
 05.03.2025 07-01 Saksbehandling 20231049 UT Substantive examination BRYN AARFLOT AS
 17.10.2024 06-04 Saksbehandling 20231049 INN P74906NO Amended Claims - OA1 - marked BRYN AARFLOT AS
 17.10.2024 06-03 Saksbehandling 20231049 INN P74906NO Amended Claims - OA1 - clean BRYN AARFLOT AS
 17.10.2024 06-02 Saksbehandling 20231049 INN 144075NO Response NIPO_2nd November 2024 BRYN AARFLOT AS
 17.10.2024 06-01 Saksbehandling 20231049 INN Korrespondanse (Hovedbrev inn) BRYN AARFLOT AS
 02.05.2024 05-02 Saksbehandling 20231049 UT PT report 03:46:56
02.05.2024 05-01 Saksbehandling 20231049 UT 20231049_1846113_PT 08 Eng BRYN AARFLOT AS
 17.10.2023 04-03 Saksbehandling 20231049 INN 766NO - Signed Declaration BRYN AARFLOT AS
 17.10.2023 04-02 Saksbehandling 20231049 INN 4Subsea - GPoA - BAA BRYN AARFLOT AS
 17.10.2023 04-01 Saksbehandling 20231049 INN Korrespondanse (Hovedbrev inn) BRYN AARFLOT AS
 04.10.2023 03-01 Saksbehandling 20231049 UT Formal Examination 1 BRYN AARFLOT AS
 04.10.2023 02-01 Saksbehandling 20231049 UT Informasjon til oppfinner Christian Linde Olsen
 02.10.2023 01-02 Saksbehandling 20231049 INN P74906GB specification as filed(6719865.1).doc BRYN AARFLOT AS
 02.10.2023 01-01 Saksbehandling 20231049 INN Søknadsskjema Patent BRYN AARFLOT AS

Description, claims and drawings

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content. Description
3490611Subsea foundationsThis invention relates to subsea foundations that are suitable to anchor mooring lines of floating installations. Such installations may include offshore energy installations such as 5 floating wind turbines (FWTs) or surface facilities for production, processing or storage of hydrocarbons, such as floating platforms or FPSOs.Common subsea foundations include suction piles, torpedo piles and driven piles, also known as pin piles. A typical suction pile is described in KR 102456098 and anchors multiple 10 downwardly-convergent mooring chains. Advantageously, such piles centralise or unify all foundation functions at a single location. However, they suffer from drawbacks of size and difficulty of installation, noting that the greater the load on the mooring chain(s), the larger the foundation must be.15 Increasing the size of a subsea foundation adds to its cost, expressed as both capital cost and installation cost, which is multiplied by the number of foundations required. High cost becomes a significant constraint in, for example, offshore windfarms where numerous floating wind turbines could require a total of hundreds of such foundations.20 Foundations comprising deadman anchors (DMAs) are known in onshore and offshore applications, for example for anchoring a containment wall, but may not be sufficiently robust for mooring large floating installations. For example, DMAs or clump weights that are laid directly on the seabed without being embedded significantly into the seabed soil could slide across the seabed under tension in an attached mooring line.25In KR 200492432, an embedded DMA is connected to a pile foundation to improve resistance of the pile to lateral traction. US 2009/123235 also discloses a pile foundation with supplementary supports. However, in each case, the pile remains the primary foundation. Thus, the DMA or other supplementary support is merely a secondary or auxiliary30 reinforcement that complicates installation and adds to the already high cost of the pile.WO 2023/117966 proposes an alternative solution for a rocky seabed in which an elongate foundation is embedded in a concrete block. The foundation is laid in a shallow trench, substantially in alignment with the axial direction of a mooring chain that is connected directly 35 to the foundation. The foundation of WO 2023/117966 is therefore unlike a DMA, which 3490612would instead extend perpendicularly to the chain axis, and is bulky, costly and complex to install.There is a need to simplify subsea foundations to reduce their capital cost but without 5 undermining their effectiveness or overly complicating their installation. In this respect, the invention takes the approach of improving cheap and simple anchors and has advantages of simplicity, flexibility and repeatability, hence reducing cost and easing installation in comparison with foundations previously known in the art.10 Against this background, the invention resides in a subsea foundation that comprises: a mooring base laid upon seabed soil; a plurality of deadman anchors embedded in the seabed soil; and a plurality of links extending through the seabed soil to couple the mooring base to the plurality of deadman anchors. Each link extends laterally from an upright plane containing the mooring base to a respective one of the plurality of deadman anchor. The 15 plurality of links are spaced along or around the mooring base, and alternate along the mooring base in mutually opposed lateral directions from the upright plane. For example, a plurality of links could alternate along the mooring base in mutually opposed lateral directions from that upright plane or otherwise from a line following the plan shape of, and directly beneath, the mooring base.20Each deadman anchor is suitably elongate in a direction that is substantially orthogonal to the respective link.The mooring base lying upon the seabed can extend across the seabed substantially parallel 25 to the seabed, mudline or seafloor. The mooring base can therefore be horizontally elongate, either substantially straight or curved in plan view. The mooring base can also be circumferentially elongate in the sense of describing a partial or complete loop in plan view. The loop may, for example, have an elliptical, circular or polygonal shape in plan view. For example, at least one link may be coupled to a face or a vertex of the polygonal shape.30The mooring base may be rigid or pliant, for example comprising a chain or other flexible or articulated element. Similarly, each link may be pliant or rigid. Also, each link may include a tensioner.35 At least one mooring line can be coupled to the mooring base. The or each mooring line can be coupled to an end, an intermediate point, a face or a vertex of the mooring base. The or 3490613each mooring line may be opposed about the mooring base with respect to, and may be substantially aligned with, a respective link.5There could be a plurality of mooring bases, each of those mooring bases being coupled to at least one of the deadman anchors by at least one of said links. For example, the foundation could be arranged such that, in plan view, the deadman anchors are grouped inwardly and the links radiate outwardly from the deadman anchors to the mooring bases. 10Correspondingly, the inventive concept embraces a method of installing a subsea foundation. The method comprises: placing a mooring base onto a seabed; and anchoring the mooring base with a plurality of deadman anchors that are coupled to the mooring base by a plurality of links extending laterally from an upright plane containing the mooring base and through 15 the soil of the seabed to a respective one of the plurality of deadman anchors. The plurality of links are spaced apart along or around the mooring base, and alternate along the mooring base in mutually opposed lateral directions from the upright plane.The mooring base can be laid, preferably progressively along its length, in a straight or 20 curved configuration. Each deadman anchor can be driven into the seabed soil. Cement can be injected into the seabed soil to embed or to constitute the deadman anchor.At least one mooring line can then be coupled to the mooring base. Optionally, each link can then be tensioned.25 In some examples, an anchoring system comprises: at least one deadman anchor embedded in the seabed; a mooring chain arranged on the seabed; and at least one tension member extending from the or each deadman anchor to the mooring chain. The mooring chain may be substantially straight, or curved, or looped or otherwise ring-shaped. The tension member may be tensioned by a mechanism that comprises a hydraulic cylinder, a 30 turnbuckle or other tensioner.Successive deadman anchors may be embedded in the seabed in locations substantially beneath the chain or in a pattern alternating between each side of the chain. 3490614The or each deadman anchor may be, or may comprise, any generally horizontal elongate element, for example a cylindrical or tubular element such as a log or a pipe, or a plate-like element5 The or each deadman anchor may be driven into the seabed and may be sunk or embedded into the seabed by vibration, for example using a vibrating actuator such as a vibrating plate.The or each deadman anchor may be, or may comprise, a body of concrete embedded in the seabed. For this purpose, concrete may be injected into the seabed, either in isolation or 10 around or beside a structural element of the deadman anchor.Other examples of the invention also implement a method to install a subsea foundation, the method comprising: embedding at least one deadman anchor in the seabed, while extending a tension member between the deadman anchor and the seabed; arranging a mooring chain 15 on the seabed; connecting the or each tension member to the mooring chain; and tensioning the or each tension member.In summary, the invention provides a low-cost but efficient subsea foundation for anchoring a mooring line. The foundation comprises a mooring base such as a chain that is simply laid 20 upon the seabed in a straight, curved or looped configuration, hence extending across the seabed and lying substantially parallel to the seabed. The mooring base is then anchored by a plurality of deadman anchors that are embedded in the seabed soil. For this purpose, a plurality of links extend through the soil to couple the mooring base to the deadman anchor(s). One or more mooring lines can then be coupled to the mooring base.25In order that the invention may be more readily understood, reference will now be made, by way of example, to the accompanying drawings in which:Figure 1 is a schematic side view of a floating wind turbine moored to a subsea 30 foundation of the invention;Figure 2 is a schematic side perspective view of the foundation shown in Figure 1;Figure 3 is a schematic plan view of the foundation shown in Figure 2; 3490615Figure 4 is a schematic side view of a variant of the foundation shown in Figures 1 to 3;Figure 5 is a schematic plan view of the foundation variant shown in Figure 4;5Figures 6a and 6b are schematic plan views of another subsea foundation of the invention, showing a sequence of installation;Figures 7, 8 and 9 are schematic plan views of further subsea foundations of the 10 invention; andFigures 10, 11 and 12 are schematic side views showing various deadman anchor arrangements for subsea foundations of the invention.15 Referring firstly to Figure 1 of the drawings, an offshore installation or floater exemplified here by a floating wind turbine 10 is shown supported buoyantly at the surface 12 of the sea. Catenary mooring lines 14, acting under tension, connect the wind turbine 10 to subsea foundations 16 of the invention, positioned at the seabed 18. The resulting spread mooring pattern could comprise mooring lines 14 and foundations 16 additional to the two that are 20 shown here in mutual opposition about the wind turbine 10. Conversely, small floating items such as buoys could be moored by a single mooring line 14 and foundation 16.In this example, each mooring line 14 has its own foundation 16. In other examples, at least one of the foundations 16 could serve as an anchorage for more than one mooring line 14, 25 which could extend from one foundation 16 to more than one floater.Figures 2 and 3 show details of one of the foundations 16 of Figure 1. The foundation 16 comprises an elongate element, exemplified here by a pliant flexible or articulated element in the form of a chain lying on the seabed 18. That element defines a mooring base 20 of the 30 foundation 16. Whilst the mooring base 20 is laid on and continues to lie substantially on top of the seabed 18, also called the seafloor or mudline, it could become embedded in the soil of the seabed 18 to some extent if that soil is sufficiently soft or if the soil drifts and accumulates on top of the mooring base 20 over time.35 A mooring line 14 extending toward the surface 12 is attached to the mooring base 20, in this example at one end of the mooring base 20. In another example, at least one mooring line 349061614 could be attached at an intermediate position between the ends of the mooring base 20, hence along the length of the mooring base 20. Alternatively, separate mooring lines 14 could be attached to both ends of the mooring base 20, for example to extend from the mooring base 20 in mutually-opposed directions.5The mooring base 20 is anchored by at least one deadman anchor (DMA) 22 that is embedded in the soil of the seabed 18 and is coupled to the mooring base 20 by a link 24 extending through that soil. In this example, there is a series of DMAs 22 coupled to the mooring base 20 by respective links 24 that are spaced apart along the length of the mooring 10 base 20. The links 24 of the series are shown here as being of substantially equal length but in other examples, at least one of the links 24 could differ in length from at least one of the other links 24.Each DMA 22 extends transversely with respect to the associated link 24, which connects to 15 a longitudinal mid-point of the DMA 22. In this example, each DMA 22 is an elongate member extending along an axis that is substantially orthogonal to a longitudinal axis of the link 24 and to the longitudinal axis of the mooring base 20.When the DMAs 22 are embedded in the seabed 18, each link 24 is inclined to extend 20 downwardly from the mooring base 20 of the foundation 16 into the soil of the seabed 18 in a direction generally opposed to the mooring line 14. Thus, the links 24 converge toward the mooring base 20 in the direction of the mooring line 14.The links 24 shown in Figures 2 and 3 all lie substantially in a common vertical plane that 25 also contains the mooring base 20. The DMAs 22 therefore extend substantially orthogonally with respect to that vertical plane and substantially parallel to each other.Figures 4 and 5 show a variant of the foundation 10 in which like numerals are used for like features. Here, the links 24 diverge at acute angles from the vertical plane that contains the 30 mooring base 20, such that the associated DMAs 22 no longer extend orthogonally with respect to the longitudinal axis of the mooring base 20. Moreover, in this example, the links 24 and the associated DMAs 22 alternate from one side of the mooring base 20 to the other along the length of the mooring base 20. Thus, the links 24 are in a longitudinally staggered herringbone arrangement when the foundation 10 is viewed from above as in Figure 5.35 Again, the links 24 converge toward each other and toward the mooring base 20 in the direction of the mooring line 14. 3490617In the plan views of the foundations 10 shown in Figures 3 and 5, and in plan views of other foundations 10 of the invention shown in Figures 6a, 6b and 7 to 9, features that are embedded into the seabed 18 are shown in dotted lines. Conversely, features that lie on 5 seabed 18 are shown in solid lines whereas mooring lines 14 extending from the foundations 10 above the seabed 18 are shown in dashed lines.In each embodiment to be described with reference to Figures 6a, 6b, 7 and 8, a DMA 22 may be defined by a cylindrical or tubular rigid body like those shown in Figures 2 to 5, which 10 could be made of concrete, metal, polymer, composite and/or wood. However, as exemplified in other embodiments to be described with reference to Figures 9 to 12, a DMA 22 could instead be defined by a plate that extends substantially horizontally and has an upright orientation to present a major face toward the associated link 24.15 Each link 24 acts in tension and so could be pliant, flexible or articulated, for example being a wire or a chain as shown in Figures 2 to 5, 6a, 6b and 8. In other arrangements like those shown in Figures 8 to 12, each link 24 could be a rigid rod or strut that is capable of acting in tension or in compression.20 Each DMA 22 can be embedded into the seabed 18 before or after laying the mooring base 20 on the seabed 18, and can be coupled to the mooring base 20 subsequently via the associated link 24. For example, each link 24 can be attached initially to the mooring base 20 and then to the DMA 22, or can be attached initially to the DMA 22 and then to the mooring base 20. More generally, each link 24 can be installed while attached initially to the mooring 25 base 20 and/or to the DMA 22.As the mooring base 20 shown in Figures 2 to 5 comprises a chain or other pliant elongate element, it can be installed easily from a vessel with minimal lifting capacity and can be laid easily onto the seabed 18 in any desired shape in plan view. Thus, the mooring base 20 30 need not be straight but could instead be curved in plan view if the mooring requirements of an offshore installation so dictate. However, the mooring base 20 could instead be defined by a rigid elongate element, which could be pre-formed with a straight or curved shape.It is also possible for the ends of the mooring base 20 to be conjoined before or after laying 35 to form a loop, which may for example be circular, elliptical or polygonal in plan view. An example of a looped mooring base 20 formed by a pliant element is shown in Figures 6a and 34906186b. Examples of looped bases 20 formed by rigid elements are shown in Figures 7 and 8. The mooring base 20 can therefore be an upright tube of circular or non-circular crosssection. In other examples, the mooring base 20 could be a solid structure rather than a hollow or looped structure.5In the examples shown in Figures 6a, 6b, 7 and 8, three DMAs 22 and associated links 24 are spaced equiangularly around the looped mooring base 20, hence in an equilateral triangular configuration. The links 24 extend radially from the mooring base 20 and the DMAs 22 are orthogonal to the respective links 24 and lie in a common horizontal plane. Thus, each 10 DMA 22 is oriented tangentially with respect to a circle that is concentric with the mooring base 20. In other examples, there could be more or fewer DMAs 22 and links 24, and there need not necessarily be equal angular spacing between them.The examples of Figures 6a, 6b, 7 and 8 also show, in dashed lines, three mooring lines 14 15 spaced equiangularly around the looped mooring base 20. The mooring lines 14 are disposed between, and hence are in circumferential alternation with, the links 24. Again, there could be more or fewer mooring lines 14 and there need not necessarily be equal angular spacing between them. Advantageously, however, each mooring line 14 may be aligned with, and in mutual opposition about the mooring base 20 to, a respective link 24 20 extending to a respective DMA 22.Referring now specifically to Figures 6a and 6b, these drawings show a foundation 16 whose mooring base 20 laid on the seabed 18 comprises a looped flexible or articulated element, again exemplified here by a chain. In this example, the embedded links 24 are also25 represented by chains acting in tension between the mooring base 20 and respective DMAs 22 also embedded in the seabed 18.Each link 24 incorporates a tensioner 26 that employs a mechanism such as a turnbuckle or a hydraulic cylinder to shorten and hence to apply tension to the link 24. In this embodiment, 30 the tensioned links 24 pull the initially circular chain of the mooring base 20 as shown in Figure 6a into a triangular shape as shown in Figure 6b.Similar tensioners 26 could be added to the links 24 of any embodiment of the invention, such as the foundation 16 shown in Figure 7 in which the embedded links 24, shown in 35 dotted lines, instead comprise wires. Figure 7 also exemplifies the mooring base 20 as a rigid triangular frame. In this example, the links 24 are coupled to respective faces of the 3490619triangular frame and mooring lines 14 extend from respective apices, corners or vertices of the triangular frame. However, the links 24 could instead be coupled to the vertices and the mooring lines 14 could instead extend from the sides or faces of the triangular frame.5 In the foundation 16 of Figure 8, the mooring base 20 is instead represented as a rigid circular frame and the links 24 are exemplified by rigid rods or struts, capable of acting in tension or in compression between the mooring base 20 and the respective DMAs 22.Figure 9 shows a foundation 16 in which embedded DMAs 22 are grouped together inwardly 10 in plan view and are optionally joined together before or after installation, for example by brackets 28 as shown. The DMAs 22 could be plates with upright orientation or could be cylindrical or tubular as previously. Embedded links 24 radiate outwardly from the grouped DMAs 22 to individual bases 20 that lie on the seabed 18. Here, each mooring base 20 is exemplified by a flat panel that lies parallel to the seabed 18 and may incorporate a15 peripheral skirt to improve engagement with the seabed 18. The links 24 are represented by rigid rods or struts but could instead comprise pliant elements such as chains or wires.Mooring lines 14 radiate outwardly from the respective bases 20, in this case in mutual alignment with the associated links 24. In the example shown in Figure 9, three mooring lines 20 14, bases 20, DMAs 22 and links 24 are spaced equiangularly in an equilateral triangular configuration. In other examples, however, there could be more or fewer mooring lines 14, bases 20, DMAs 22 and links 24, and there need not necessarily be equal angular spacing between them.25 Turning finally to Figures 10 to 12, these drawings show one of the DMAs 22 of the foundation 16 of Figure 9 in conjunction with the associated link 24 and mooring base 20, together with the associated mooring line 14 extending from the mooring base 20 above the seabed 18. Figure 10 shows these features in exploded form and also shows an installation tool 30 that vibrates or hammers the DMA 22 to drive it into the seabed 18, optionally after a 30 trench 32 is dug to receive the DMA 22. Typically, the DMA 22 will be embedded in the seabed 18 before coupling the link 24 to the DMA 22. The mooring base 20 is then coupled to the link 24 before the mooring line 14 is coupled to the mooring base 20.Figure 11 shows the DMA 22 embedded in a body of concrete 34 formed by injecting cement 35 into a trench 32 in the seabed 18. Functionally, the concrete 34 therefore forms part of the 34906110DMA 22. Figure 12 shows a similarly-installed body of concrete that serves as the DMA 22 and may conveniently embed an end of the link 24 remote from the mooring base 20.
Claims
34906111Claims1. A subsea foundation, comprising:5 a mooring base laid upon seabed soil;a plurality of deadman anchors embedded in the seabed soil; anda plurality of links, extending through the seabed soil to couple the mooring base to 10 the plurality of deadman anchors, each of the links extending laterally from an upright plane containing the mooring base to a respective one of the plurality of deadman anchors, wherein the plurality of links are spaced apart along or around the mooring base, and alternate along the mooring base in mutually opposed lateral directions from the upright plane.152. The foundation of Claim 1, wherein the mooring base extends across the seabed substantially parallel to the seabed.3. The foundation of Claim 1 or Claim 2, wherein the mooring base is horizontally elongate.204. The foundation of Claim 3, wherein the mooring base is substantially straight in plan view.5. The foundation of Claim 3, wherein the mooring base is curved in plan view.25 6. The foundation of any preceding claim, wherein the mooring base describes a loop in plan view.7. The foundation of any preceding claim, wherein the mooring base has a polygonal shape in plan view.308. The foundation of Claim 7, wherein each link is coupled to a face or a vertex of the polygonal shape.9. The foundation of any preceding claim, wherein the mooring base is rigid.3510. The foundation of any of Claims 1 to 8, wherein the mooring base is pliant.3490611211. The foundation of Claim 10, wherein the mooring base is formed by a chain.12. The foundation of any preceding claim, wherein each link is pliant.513. The foundation of any of Claims 1 to 11, wherein each link is rigid.14. The foundation of any preceding claim, wherein each link comprises a tensioner.10 15. The foundation of any preceding claim, further comprising at least one mooring line coupled to the mooring base.16. The foundation of Claim 15, wherein the at least one mooring line is coupled to an end, an intermediate point, a face or a vertex of the mooring base.1517. The foundation of Claim 15 or Claim 16, wherein the at least one mooring line is opposed about the mooring base with respect to the plurality of links.18. The foundation of any of Claims 15 to 17, wherein the at least one mooring line is 20 substantially aligned with the plurality of links.19. The foundation of any preceding claim, wherein each deadman anchor is elongate in a direction that is substantially orthogonal to the respective link.25 20. The foundation of any preceding claim and comprising a plurality of mooring bases, each of those mooring bases being coupled to at least one of the plurality of deadman anchors by at least one of the plurality of links.21. The foundation of Claim 20, arranged such that, in plan view, the deadman anchors are 30 grouped inwardly and the links radiate outwardly from the deadman anchors to the mooring bases.22. A method of installing a subsea foundation, comprising: placing a mooring base onto a seabed; and anchoring the mooring base with a plurality of deadman anchors that are 35 coupled to the mooring base by a plurality of links, each of the plurality of links extending laterally from an upright plane containing the mooring base and through the soil of the34906113seabed to a respective one of the plurality of deadman anchors, wherein the plurality of links are spaced apart along or around the mooring base, and alternate along the mooring base in mutually opposed lateral directions from the upright plane.5 23. The method of Claim 22, comprising laying the mooring base in a straight configuration.24. The method of Claim 22, comprising laying the mooring base in a curved configuration.25. The method of any of Claims 22 to 24, comprising driving the at least one deadman 10 anchor into the seabed soil.26. The method of any of Claims 22 to 25, comprising injecting cement into the seabed soil to embed or to constitute the deadman anchor.15 27. The method of any of Claims 22 to 26, further comprising tensioning the plurality of links.28. The method of any of Claims 22 to 27, further comprising coupling at least one mooring line to the mooring base.34906114Patentkrav1. Et undersjøisk fundament, som omfatter:5 en fortøyningsbase lagt på havbunnen,et antall dødmannsankre nedgravd på havbunnen, oget antall lenker som strekker seg gjennom havbunnens for å koble fortøyningsbasen 10 til de mange dødmannsankrene, hvori hver av lenkene strekker seg lateralt fra et oppreist plan som inneholder fortøyningsbasen til et respektivt ett av de mange dødmannsankrene, hvori de mange lenkene er plassert med i en avstand langs eller rundt fortøyningsbasen, og veksler langs fortøyningsbasen i gjensidig motsatte laterale retninger fra det oppreiste planet.152. Fundamentet ifølge krav 1, hvori fortøyningsbasen strekker seg over havbunnen og vesentlig parallelt med havbunnen.3. Fundamentet ifølge krav 1 eller krav 2, hvori fortøyningsbasen er horisontalt avlang.204. Fundamentet ifølge krav 3, hvori fortøyningsbasen er i det vesentlige rett i planvisning.5. Fundamentet ifølge krav 3, hvori fortøyningsbasen er buet i planvisning.25 6. Fundamentet ifølge et hvilket som helst av de foregående krav, hvori fortøyningsbasen beskriver en løkke i planvisning.7. Fundamentet ifølge et hvilket som helst av de foregående krav, hvori fortøyningsbasen har en polygonal form i planvisning.308. Fundamentet ifølge krav 7, hvori hver lenke er koblet til en flate eller et hjørne av den polygonale formen.9. Fundamentet ifølge et hvilket som helst av de foregående krav, hvori fortøyningsbasen er 35 stiv.3490611510. Fundamentet ifølge et hvilket som helst av kravene 1 til 8, hvori fortøyningsbasen er bøyelig.11. Fundamentet ifølge krav 10, hvori fortøyningsbasen er dannet av en kjetting.512. Fundamentet i ifølge et hvilket som helst av de foregående krav, hvori hver lenke er bøyelig.13. Fundamentet i ifølge et hvilket som helst av kravene 1 til 11, hvori hver lenke er stiv. 1014. Fundamentet i ethvert foregående krav, hvori hver lenke omfatter en strammer.15. Fundamentet ifølge et hvilket som helst av de foregående krav, videre omfattende minst én fortøyningslinje koblet til fortøyningsbasen.1516. Fundamentet ifølge krav 15, hvori minst én fortøyningslinje er koblet til en ende, et mellomliggende punkt, en flate eller et hjørne av fortøyningsbasen.17. Fundamentet ifølge krav 15 eller krav 16, hvori i det minste én fortøyningslinje er motsatt 20 fortøyningsbasen i forhold til de mange lenkene.18. Fundamentet i ethvert av kravene 15 til 17, hvor i det minste én fortøyningslinje er i det vesentlige justert med de mange lenkene.25 19. Fundamentet ifølge et hvilket som helst av de foregående krav, der hvert dødmannsanker er avlangt i en retning som er i det vesentlige ortogonal til den respektive lenken.20. Fundamentet ifølge et hvilket som helst av de foregående krav og omfattende et antall 30 fortøyningsbaser, der hver av disse fortøyningsbasene er koblet til minst ett av de mange dødmannsankrene med minst én av lenkene.21. Fundamentet ifølge krav 20, arrangert slik at, i planvisning, er dødmannsankrene gruppert innover og lenkene stråler utover fra dødmannsankrene til fortøyningsbasene. 3522. En fremgangsmåte for å installere et undersjøisk fundament, omfattende å:34906116plassere en fortøyningsbase på en havbunn, og forankre fortøyningsbasen med et antall dødmannsankere som er koblet til fortøyningsbasen med et antall lenker, der hver av lenkene strekker seg lateralt fra et oppreist plan som inkluderer fortøyningsbasen og gjennom havbunnen til et respektivt ett av dødmannsankrene, der lenkene er plassert med 5 en avstand langs eller rundt fortøyningsbasen, og veksler langs fortøyningsbasen i gjensidig motsatte laterale retninger fra det oppreiste planet.23. Fremgangsmåten ifølge krav 22, omfattende å legge fortøyningsbasen i en rett konfigurasjon.1024. Fremgangsmåten ifølge krav 22, omfattende å legge fortøyningsbasen i en buet konfigurasjon.25. Fremgangsmåten ifølge et hvilket som helst av kravene 22 til 24, omfattende å drive 15 minst ett dødmannsanker ned i havbunnen.26. Fremgangsmåten ifølge et hvilket som helst av kravene 22 til 25, omfattende å injisere sement i havbunnen for å nedgrave eller utgjøre dødmannsankeret.20 27. Fremgangsmåten ifølge et hvilket som helst av kravene 22 til 26, videre omfattende å stramme lenkene.28. Fremgangsmåten ifølge et hvilket som helst av kravene 22 til 27, videre omfattende å koble minst én fortøyningslinje til fortøyningsbasen.
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No priority

Patent classes

IPC classesB63B 21/26B63B 21/50E02D 27/52CPC classesB63B 21/26B63B 21/50E02D 27/525

Citations

US 2022/402577 A1 (A1)US 2019/352878 A1 (A1)JP S60108598 U (U)

Applicants, owners and inventors

Owners
Subsea 7 Norway AS
Kanalsletta 9 4033 STAVANGER NO (STAVANGER Municipality, Rogaland county)Org. number: 936742475Inventors
Christian Linde Olsen
Krokusstien 4 4022 STAVANGER NO (STAVANGER Municipality, Rogaland county)

Agent

BRYN AARFLOT AS
BRYN AARFLOT AS

Org. number: 979993269

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Stortingsgata 8 0161 OSLO NO (OSLO Municipality, Oslo county)
Org. number: 979993269
Reference: 144075NO

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