US20170050703A1 - Fluked Burying Devices - Google Patents

Fluked Burying Devices Download PDF

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Publication number
US20170050703A1
US20170050703A1 US15/307,749 US201515307749A US2017050703A1 US 20170050703 A1 US20170050703 A1 US 20170050703A1 US 201515307749 A US201515307749 A US 201515307749A US 2017050703 A1 US2017050703 A1 US 2017050703A1
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United States
Prior art keywords
burying device
chain cable
fluked burying
link
plane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US15/307,749
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English (en)
Inventor
Peter Bruce
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Brupat Ltd
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Brupat Ltd
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Filing date
Publication date
Priority claimed from GB201407664A external-priority patent/GB201407664D0/en
Priority claimed from GBGB1414960.3A external-priority patent/GB201414960D0/en
Application filed by Brupat Ltd filed Critical Brupat Ltd
Assigned to BRUPAT LIMITED reassignment BRUPAT LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRUCE, PETER
Publication of US20170050703A1 publication Critical patent/US20170050703A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/30—Anchors rigid when in use
    • B63B21/34—Anchors rigid when in use with two or more flukes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • B63B2021/262—Anchors securing to bed by drag embedment

Definitions

  • the present invention relates to cable-mounted fluked burying devices for increasing both the penetration and holding capacity of a drag embedment marine anchor and cable system.
  • fluked burying devices are disclosed in U.S. Pat. No. 3,685,479 which shows a first fluked burying device for mounting on a wire hawser and a second fluked burying device for mounting in a chain cable to form an integral link thereof.
  • the fluked burying devices interact with seabed soil to impress axial forces in the cable which increase holding capacity directly.
  • the devices also increase holding capacity indirectly by impressing transverse forces in the cable which counteract penetration resistance thereof to promote deeper penetration of the anchor with consequent increase in capacity.
  • Disadvantages of the first fluked burying device include slippage of clamping means attaching the device to the wire hawser and both handling and operational damage arising from localised bending of the wire hawser due to lack of articulation at both forward and aft ends of the device.
  • Disadvantages of the second fluked burying device include: a requirement for structural adaptation to carry high transmitted loads in the anchor cable which are considerably in excess of those contributed by the device; a requirement for costly connecting shackles to provide an adequate degree of articulation while carrying high transmitted loads; and a Classification Society requirement for the application of a high proof load to the device and to the shackles, on completion of manufacturing, equal to that required for the associated chain cable.
  • the last-mentioned Classification Society requirement applies to all devices which are integral with the chain and through which chain tension is transmitted.
  • a fluked burying device includes a plane of symmetry and comprises a body member and a fluke member attached thereto at an acute angle of inclination to a longitudinal axis of said body member, and includes attachment means for holding said body member in a fixed position on a chain cable comprising a series of links, whereby said longitudinal axis is maintained substantially aligned with an axis of said chain cable, said body member being adapted to maintain said chain cable extending in a defined attitude therein, said attachment means including first contact points on said body member for transferring axial load therefrom to corresponding points on a link of said chain cable and second contact points on said body member for transferring transverse load therefrom to corresponding points on a link of said chain cable.
  • said defined attitude comprises alternate links of said chain cable being maintained in a plane at right angles to said plane of symmetry.
  • said first contact points transfer axial load to corresponding points on a first link of said chain cable and said second contact points transfer transverse load to corresponding points on a second link of said chain cable.
  • said second contact points are positioned such as to constrain induction of bending stresses in said link of said chain cable during operation of said fluked burying device to be similar to that which occurs in a wildcat of a windlass for tensioning said chain cable.
  • said second contact points are positioned on said body member at two locations to bear on two of said links spaced apart such as to oppose turning moment induced in said fluked burying device during interaction with a seabed soil while penetrating therein with said chain cable taut.
  • said two positions of said second contact points are spaced apart by not less than 12 times bar diameter of said links and, preferably, not less than 20 times said bar diameter.
  • said second contact points are positioned such that said corresponding load transfer points on a link lying in a plane at right angles to said plane of symmetry are spaced from said plane of symmetry by a distance in the range of 0.8 to 1.0 times the nominal diameter of said link.
  • said second contact points are positioned such that said corresponding load transfer points on a link lying in a plane at right angles to said plane of symmetry are separated from a central point of a crown section, lying in said plane of symmetry, of said link by a distance in the range of 0.4 to 0.6 times the nominal diameter of said link measured in a direction parallel to said axis of said chain cable.
  • said attachment means comprises a pocket in said body member arranged of accommodate a link of said chain cable.
  • said pocket constrains said link of said chain cable to lie in a plane at right angles to said plane of symmetry.
  • said fluked burying device is formed substantially in two halves for opposed sideways assembly on said chain cable.
  • said first contact points are located adjacent said fluke member whereby tensile loading impressed in said chain cable by said fluked burying device substantially bypasses the portion of said body member lying forward of said first contact points.
  • said body member comprises two elongate members each disposed substantially parallel to said plane of symmetry and each extending along one of two opposed sides of said chain cable.
  • said elongate members are plate-like.
  • said pocket comprises an elongate slot perforating each of said plate-like elongate members to accommodate said link.
  • said elongate members are spaced apart by a distance between 1.06 and 1.1 times the nominal diameter of said link.
  • said body member has a width less than that of a link of said chain cable, measured transverse to said chain cable.
  • said elongate members each have a width less than a bar diameter of a link of said chain cable and, further preferably, less than 0.5 times said bar diameter, measured transverse to said chain cable.
  • said elongate members are splayed apart at an extremity such that a link of said chain cable emergent from said extremity can swing freely sideways from said plane of symmetry through an angle of up to 20°, with 12° further preferred.
  • said emergent link can swing in said plane of symmetry through an angle of up to 90° from said longitudinal axis.
  • said fluked burying device including said second contact points at two spaced locations also includes a roll stabilizer.
  • a fluked burying device terminating said chain cable includes a yaw stabilizer.
  • said fluked burying device is arranged such that a straight line containing a centre point of a forward crown section, lying in said plane of symmetry, of a link in a foremost pocket in said body member and a point of projection onto said plane of symmetry of a foremost point of said fluke member is inclined to said longitudinal axis at an angle in the range of 25° to 35°, with 30° further preferred.
  • FIG. 1 shows an oblique front view of a fluked burying device
  • FIG. 2 shows an oblique rear view of the fluked burying device of FIG. 1 ;
  • FIG. 3 shows a plan view of the fluked burying device of FIG. 1 ;
  • FIG. 3A shows a detail of FIG. 3 to a larger scale
  • FIG. 4 shows a side view of the fluked burying device of FIG. 1 ;
  • FIG. 5 shows a view of the fluked burying device of FIG. 1 in direction X of FIG. 4 :
  • FIG. 6 shows a section Y-Y of the fluked burying device of FIG. 4 ;
  • FIG. 6A shows effective footing width W of inclined studless chain cable
  • FIG. 7 shows a side view of a modification of the fluked burying device of FIG. 1 ;
  • FIG. 8 shows fluked burying devices installed in a deep layer of soil
  • FIG. 8A shows fluked burying devices installed in a shallow layer of soil over rock
  • FIG. 9 shows an oblique view of the fluked burying device of FIG. 1 with roll stabilizers
  • FIG. 10 shows an oblique view of the fluked burying device of FIG. 7 with yaw stabilizers.
  • a fluked burying device 1 is formed in two parts 2 , 3 comprising a port half 2 and a starboard half 3 , arranged for opposed attachment to each other about and in parallel with chain cable 4 .
  • Fluked burying device 1 is symmetrical about a plane of symmetry 5 ( FIGS. 4 and 5 ) which contains axis 6 of chain cable 4 which extends internally within shank 7 thereof.
  • Plane of symmetry 5 is vertically orientated when fluked burying device 1 is buried in seabed soil 38 of seabed 39 ( FIG. 8 ).
  • Port and starboard halves 2 , 3 include shank 7 and fluke 8 .
  • Shank 7 comprises forward shank 7 A, extending forward of fluke 8 , and aft shank 7 B, extending aft of fluke 8 .
  • Shank 7 and fluke 8 are formed respectively by plates 9 and 10 joined together at junction 11 .
  • Plate 9 of shank 7 has three slots 12 A, 12 B, and 12 C ( FIGS. 1, 2 and 4 ) formed therein to function as pockets for accommodating links 17 A, 17 B, and 17 C respectively of chain cable 4 .
  • Links 16 are held in plane of symmetry 5 whereas links 17 are held at right angles thereto.
  • Slots 12 A, 12 B, and 12 C are axially aligned in a plane 13 ( FIG. 4 ) disposed at right angles to plane of symmetry 5 .
  • Longitudinal axis 14 of fluked burying device 1 is defined by the intersection of plane of symmetry 5 with plane 13 ( FIGS. 3 and 4 ).
  • slots 12 A, 12 B, and 12 C hold axis 6 substantially coincident with axis 14 .
  • Port and starboard halves 2 , 3 of fluked burying device 1 are assembled with plates 9 in parallel with plane of symmetry 5 and with corresponding slots 12 A, 12 B, and 12 C registering with each other.
  • Halves 2 and 3 and are fastened together sideways about chain cable 4 by means of bolts 15 passing through plates 9 and spacers 15 A which serve to maintain sufficient clearance for links 16 ( FIG. 5 ) of chain cable 4 lying in plane of symmetry 5 to avoid clamping of links 16 by plates 9 .
  • spacers 15 A space plates 9 apart by a distance in the range of 1.05 to 1.1 times the nominal diameter D ( FIG. 4 ) of chain cable 4 .
  • Slots 12 A, 12 B, and 12 C provide a loose fit about corresponding links 17 A, 17 B, and 17 C to provide sufficient clearance in a direction parallel to axis 14 ( FIG. 4 ) to allow chain cable 4 to stretch under extreme loading without being restrained by slots 12 A, 12 B, and 12 C.
  • Plate 9 has lower extension 9 A and upper extension 9 B, at junction 11 , provided to support fluke 8 .
  • Tapered plate ribs 18 are welded to plates 9 and 10 to increase the bending resistance of fluke 8 .
  • Plate rib extensions 18 A bearing against each other at plane of symmetry 5 take compressive loading between halves 2 and 3 of fluked burying device 1 ( FIGS. 2 and 3 ).
  • Distance E ( FIG. 4 ) separating forward end 120 of slot 12 C from aft end 12 E of slot 12 B is chosen to provide minimal clearance between forward end 120 and link 17 C and minimal clearance between aft end 12 E and link 17 B.
  • Forward end 120 of slot 12 C bearing on link 17 C constitutes aft stop point 19 A which prevents fluked burying device 1 from being pushed aft on chain cable 4 when fluke 8 is subjected to soil loading during forwards embedment of fluked burying device 1 .
  • Aft end 12 E of slot 12 B bearing on link 17 B constitutes forward stop point 19 B to arrest fluked burying device 1 from being pushed forward on chain cable 4 when fluke 8 is subjected to soil loading during rearwards recovery of fluked burying device 1 .
  • stop points 19 A and 19 B act together to locate fluked burying device 1 in a fixed position axially on chain cable 4 while the before-mentioned allowance for stretching ensures that axial loading can be transferred only via stop points 19 A or 19 B irrespective of the magnitude of tension in chain cable 4 .
  • Transverse reaction bearing forces between shank 7 and links 17 A and 17 C of taut chain cable 4 acting through bearing contact points A at the forward ends of slots 12 A and bearing contact points B at the aft ends of slots 12 C provide a resisting moment to counteract a moment arising from loading of fluke 8 which tends to rotate fluked burying device 1 in plane of symmetry 5 relative to forward and aft portions of axis 6 of chain cable 4 external to fluked burying device 1 .
  • Bearing contact points A and B are separated by a moment arm distance L ( FIG. 4 ) approximately equal to 20 times the nominal bar diameter D ( FIGS.
  • Plate 10 of fluke 8 is inclined to plate 9 of shank 7 at an angle ⁇ ( FIG. 5 ) in the range 90° to 115°, with 95° preferred.
  • Junction 11 between plate 10 of fluke 8 and plate 9 of shank 7 is inclined to axis 14 at angle ⁇ ( FIG. 4 ) which is in the range of 35° to 60°, with 50° preferred.
  • Leading edge 21 of fluke 8 is inclined to junction 11 at an angle ⁇ ( FIG. 1 ) in the range 45° to 75°, with 60° preferred.
  • a straight line 22 ( FIG.
  • junction 11 is approximately 17 times diameter D.
  • the length of trailing edge 27 of fluke 8 is approximately 13 times diameter D.
  • diameter D equals 50 mm
  • the fluke area of fluked burying device 1 projected on a plane (not shown), containing junction 11 and at right angles to plane of symmetry 5 is approximately 0.9 square metre.
  • Forward extremity 28 of plates 9 of forward shank 7 A and rearward extremity 29 of plates 9 of aft shank 7 B each have a radius R ( FIG. 4 ) made equal to 1.5 times diameter D.
  • R radius
  • rearward emergent link 16 B FIGS.
  • link 17 C which is restrained in slot 12 C, but through only about 150° in plane of symmetry 5 due to chain cable 4 being restrained by making contact with fluke 8 , while link 17 E remains able to pivot simultaneously on link 16 B through some 180° in a plane transverse to plane of symmetry 5 .
  • Transverse loading contact points A and B ( FIGS. 3 and 3A ) between plates 9 of shank 7 and links 17 A and 17 C are located at positions which normally occur when such chain links are loaded in a wildcat (also known as a cable-lifter or gypsy) of a windlass. These load transfer points are known from FIG. 14 in published paper number 3813 of the Offshore Technology Conference, Houston, May, 1980, by A. Berg and A.
  • Taraldsen of Det Norske Veritas, which indicates that a central point of a load transfer area on a link lies at a distance of approximately 0.90 from a transverse plane containing the central axis of the chain link and separated by a distance of approximately 0.50 from the centre of a crown section of the link measured in a direction parallel to the central axis of the link.
  • contact points A and B in shank 7 are arranged to be spaced by distance X ( FIG. 3A ) from plane of symmetry 5 and located such as to be separated from central point 23 of crown section 24 of link 17 A or link 17 C, respectively, by distance Y measured in a direction parallel to axis 6 of chain cable 4 .
  • Distance X is in the range 0.8D to 1.0D and distance Y is in the range 0.4D to 0.6D so that links 17 A and 17 C are loaded as if in a wildcat.
  • Forward extremity 28 and rearward extremity 29 of plates 9 are splayed apart from lines A 1 and B 1 just aft and forward of points A and B respectively ( FIGS. 4 and 5 ) through a bend angle ⁇ ( FIG. 3 ) of 20° to allow links 16 A and 16 B to pivot through angle ⁇ out of plane of symmetry 5 before being arrested by the splayed extremities 28 and 29 .
  • This allows azimuthal veering of chain cable 4 to be accommodated without bending link 16 A or link 16 B. Since spacing 1.1D between plates 9 is less than width 1.5D of a wildcat groove, the above-noted spacing of bearing points A and B from plane of symmetry 5 is maintained despite extremities 28 and 29 being splayed apart.
  • the penetration resistance of chain cable 4 moving in direction P ( FIGS. 6A and 8 ), inclined at angle ⁇ to axis 6 , in seabed soil 38 , is proportional to area AP of unit length of chain cable 4 viewed obliquely in direction P, where AP is gross area, neglecting internal apertures in chain cable 4 through which, in practice, soil is unable to flow.
  • the width W ( FIG. 6A ) of a unit length of rectangular strip footing of area equal to AP is the effective footing width of chain cable 4 moving in direction P. W is a measure of the penetration resistance of chain cable 4 in seabed soil 38 .
  • shank 7 is restricted to being not greater than width WL, which is equal to 3.35D for studless chain, so that shank 7 does not add to the penetration resistance of chain cable 4 at the critical stage of penetrating into a firm seabed surface 40 when ⁇ is small. Further, adoption of a lesser width for shank 7 in the range of 1.9D to 2.2D is preferred when ⁇ increases as high as 30°, which is known to occur when a series of several fluked burying devices 1 penetrate deeply to depth Z ( FIG. 8 ) below seabed surface 40 .
  • Plates 9 and 10 are of thickness t 9 ( FIG. 6 ) and t 10 ( FIG. 5 ) respectively and may be of equal thickness for economy of fabrication. Thickness t 9 of plates 9 is chosen to be less than diameter D so that width WS of shank 7 is less than 3.35D. Preferably, thickness t 9 is chosen to be not more than 0.60, and preferably less than 0.5D, to minimise the penetration resistance added by shank 7 to chain cable 4 at higher angles of inclination to axis 6 of the penetration direction P of chain cable 4 .
  • terminal fluked burying device 1 A is a modification of fluked burying device 1 better suited for use as a terminal device at the end of chain cable 4 .
  • Shank 7 of terminal fluked burying device 1 A is made hook-shaped in side view and lengthened to accommodate five links 17 of chain cable 4 in five slots 12 .
  • Fluke 8 is enlarged and offset from plane 13 and axis 14 such that furthest aft point 30 of junction lilies on or below plane 13 .
  • Shank 7 of fluked burying device 1 A is splayed apart adjacent forward extremity 28 A in the same manner as for fluked burying device 1 .
  • links 16 A and 17 A are supported and loaded in the same manner as for fluked burying device 1 .
  • the increased offset loading of fluke 8 results in higher bending moments in shank 7 .
  • These induce higher stresses which are accommodated by increasing appropriately the section depth of plates 9 with distance from end 28 A of shank 7 and adding doubler plates 31 between plates 9 to act as spacers which increase the strength of shank 7 without increasing width WS thereof.
  • Two contoured spacer plates 32 are welded to each of plates 9 to act both as spacers and provide stop points 19 C and 190 which differ from previously shown stop points 19 A and 19 B in that penultimate link 33 and ultimate link 34 of chain cable 4 , lying in plane of symmetry 5 , are restrained thereby.
  • Heavy bolts 35 pass through plates 9 and spacer plates 32 to prevent spacer plates 32 from being forced apart by large forces transferred thereto from ultimate link 34 .
  • Ultimate link 34 may also serve as a lug for attachment of a pendant line to facilitate installation.
  • Plates 9 of shank 7 are extended to tip 20 of fluke 8 by way of tapered stiffeners 36 and 37 to enable terminal fluked burying device 1 A to withstand high concentrated loading applied at tip 20 .
  • terminal fluked burying device 1 A is, in essence, a marine drag embedment anchor constructed in two halves for assembly sideways onto chain cable 4 with chain cable 4 therein acting as a parallel load-bearing element and providing sufficient articulation to eliminate both a need for a conventional heavy and expensive shackle and the high penetration resistance penalty associated with such a shackle.
  • Fluked burying devices 1 and 1 A may be fitted with roll stabilizers 42 and yaw stabilizers 43 respectively ( FIGS. 9 and 10 ).
  • Roll stabilizers 42 ( FIG. 9 ) comprise rectangular plates 43 attached one at each side of fluked burying device 1 to edge 44 of fluke plate 10 at a position approximately midway along the length of edge 44 with edge 45 of plate 43 being aligned with edge 44 .
  • Plates 43 lie in plane 46 which is disposed at right angles to plane of symmetry 5 ( FIGS. 3 and 5 ) and which is inclined at an angle ⁇ to axis 14 of fluked burying device 1 .
  • Plane 46 intersects plane of symmetry 5 in line 46 A. Angle ⁇ is subtended by line 46 A and axis 14 and is in the range of 0° to 40°, with 20° preferred.
  • the area of plate 43 is in the range of 8 to 12 per cent of the area of each plate 10 with 10 per cent preferred. Soil incident on plate 43 produces a force parallel to plane of symmetry 5 which gives rise to a roll moment about axis 6 of chain cable 4 . Any rolling action of fluked burying device 1 causes one of plates 43 to bury deeper in soil 38 than the other and so gives rise to a net imbalance in roll moments about axis 6 acting in opposition to the rolling action, thus providing a roll stabilizing effect.
  • Fluked burying device 1 need be stabilized only in roll since tension in chain cable 4 resists yaw misalignment, between axis 14 of fluked burying device 1 and those portions of axis 6 of chain cable 4 adjacent and external to fluked burying device 1 , by giving rise to a large countervailing moment.
  • Yaw stabilizers 46 ( FIG. 10 ) comprise substantially triangular plates 47 attached one at each side of terminal fluked burying device 1 A.
  • a forward apex 47 A of triangular plate 47 is attached to edge 48 of fluke plate 10 at a position approximately midway along the length of edge 48 .
  • Upper edge 49 of triangular plate 47 lies in plane 50 containing fluke plate 10 which is extended locally to support triangular plate 47 .
  • Triangular plate 47 is located in plane 51 which is inclined at angle ⁇ to plane of symmetry 5 ( FIGS. 3 and 5 ) such that the intersection (not shown) between plane 51 and plane of symmetry 5 is at right angles to axis 14 of terminal fluked burying device 1 A.
  • angle ⁇ FIG.
  • fluked burying devices 1 may be used in conjunction with terminal fluked burying device 1 A ( FIG. 8 ) to enable the full load carrying capability of any size of chain cable to be exploited fully.
  • Each fluked burying device 1 effectively cancels adjacent penetration resistance of chain cable 4 in seabed soil 38 to allow terminal fluked burying device 1 A to achieve penetration depth Z below seabed surface 40 sufficient for the load contributions of each device, in aggregate, to match the breaking load of chain cable 4 .
  • seabeds 39 having penetrable soils 38 of limited vertical extent overlying impenetrable rock layer 41 FIG. 8A
  • an extended series of fluked burying devices 1 may be deployed and installed against layer 41 , again with the load contributions from each device, in aggregate, being able to match the breaking load of chain cable 4 .
  • Terminal fluked burial device 1 A may also be used in place of fluked burying device 1 to exploit the advantage of having a fluke offset from axis 6 of chain cable 4 .
  • a series of fluked burying devices 1 A may, for example, be used on a hard sea bed surface 40 where offset flukes 8 are able to penetrate almost fully before underside 41 ( FIG. 7 ) of shank 7 bears on surface 40 of seabed 39 to resist or even arrest further embedment.
  • plates 9 of shank 7 may be provided with a different number of slots 12 than shown in the accompanying drawings.
  • additional elongated split spacers (not shown) between plates 9 may be provided along the periphery of shank 7 to enable external welding along the split line to be performed, after assembly of fluked burying device 1 onto chain cable 4 , if so desired for long term service.
  • fluked burying devices 1 and 1 A are each constructed in two halves for final assembly on chain cable 4 , the number deployed and the spacing between devices can be selected to suit soil conditions and user preferences.
  • the devices are readily and cheaply transportable in gauge in standard shipping containers while disassembled.
  • Incorporating chain cable 4 within fluked burial devices 1 and 1 A and the splaying of plates 9 of shank 7 to provide an adequate degree of articulation eliminates need for expensive shackles.
  • the use of chain cable 4 as a major load-bearing element within devices 1 and 1 A allows a significant reduction in stresses to be achieved which results in reduced structural cost.
  • the ability to distribute loading along a length of chain cable 4 by using a multiplicity of fluked burying devices 1 in conjunction with a terminal fluked burying device 1 A allows high holding capacity to be obtained from seabeds having shallow or deep sediment conditions in a manner and at a low cost hitherto unobtainable.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Piles And Underground Anchors (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
US15/307,749 2014-05-01 2015-04-09 Fluked Burying Devices Abandoned US20170050703A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB1407664.0 2014-05-01
GB201407664A GB201407664D0 (en) 2014-05-01 2014-05-01 Fluked burying devices
GBGB1414960.3A GB201414960D0 (en) 2014-08-22 2014-08-22 Fluked Burying devices
GB1414960.3 2014-08-22
PCT/GB2015/051087 WO2015166207A1 (en) 2014-05-01 2015-04-09 Fluked burying devices

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US20170050703A1 true US20170050703A1 (en) 2017-02-23

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US15/307,749 Abandoned US20170050703A1 (en) 2014-05-01 2015-04-09 Fluked Burying Devices

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US (1) US20170050703A1 (ja)
EP (1) EP3137372B1 (ja)
JP (1) JP6647281B2 (ja)
KR (1) KR20160148017A (ja)
CN (1) CN106458293A (ja)
AU (1) AU2015255121A1 (ja)
BR (1) BR112016025062A2 (ja)
CA (1) CA2946444A1 (ja)
SG (1) SG11201608793QA (ja)
WO (1) WO2015166207A1 (ja)

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CN108668973A (zh) * 2018-06-29 2018-10-19 合肥学院 一种锚板数量可调节变化的拖曳锚
CN109823477B (zh) * 2019-02-21 2020-12-11 河海大学 一种可提升抗拔承载性能的海洋工程拖曳锚
CN110949614B (zh) * 2019-12-06 2021-12-03 震兑工业智能科技有限公司 一种现代船舶系泊定位装置

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US5067430A (en) * 1990-06-07 1991-11-26 The Charles Henry Ford Trust Anchor with axis control bar
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KR20160148017A (ko) 2016-12-23
JP2017514754A (ja) 2017-06-08
AU2015255121A1 (en) 2016-10-27
CN106458293A (zh) 2017-02-22
EP3137372B1 (en) 2019-08-21
CA2946444A1 (en) 2015-11-05
BR112016025062A2 (pt) 2017-08-15
SG11201608793QA (en) 2016-11-29
WO2015166207A1 (en) 2015-11-05
EP3137372A1 (en) 2017-03-08

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