CN1203166A

CN1203166A - Device for implementation of anchor into sea bottom

Info

Publication number: CN1203166A
Application number: CN 98108333
Authority: CN
Inventors: 西格蒙·阿斯克斯塔德
Original assignee: Norsk Hydro ASA
Current assignee: Norsk Hydro ASA
Priority date: 1997-05-21
Filing date: 1998-05-21
Publication date: 1998-12-30
Also published as: NO311624B1; EP0983187B1; AU734658B2; EP0983187A1; NO972330D0; DK0983187T3; NO972330L; WO1998052819A1; CA2290564A1; ID24342A; BR9809847A; AU7457898A

Abstract

A device for lowering an anchor (2,13) into the sea bed (28) comprises an implementation tool (1,11) which can be removed from the anchor and which includes one or more hollow bodies which are closed at the top and preferably cylindrical and which are designed to have negative pressure applied to them and to lower the anchor (2,13) into the sea bed.

Description

Be used for anchor is fallen into the device in seabed

The present invention is one and relates to and be used for invention that anchor or analogue are fallen into the seabed.Specifically, the present invention relates to be used for the Norwegian patent applications device that No. 964139 described anchor is fallen with the applicant oneself.

Above-mentioned Norwegian patent applications is described a kind of anchor, and this anchor comprises a polygonal body that has concave side, and the ground tackle that is in " grappling " position of falling has the very big grappling performance relevant with its weight.

As described in this patent application, the anchor of the above-mentioned type can be used as piled anchor or falls in the seabed as the suction anchor.As the suction anchor, the angle is sealed with lid or allied equipment in the top of anchor, thereby can apply the negative pressure with respect to surrounding environment in the anchor chamber, so that anchor is drawn in the seabed.A shortcoming of self-priming anchor is, they can not be than the top (lid) of anchor deeper to being lowered to the seabed.Another shortcoming of the anchor of this band concave side is that they must be reinforced so that bear internal negative pressure, and this also can gain in weight.

The objective of the invention is to be anchor, the anchor that constitutes in particular for the polygonal body of being with concave side provides a kind of device, and it can spur anchor below the surface, seabed, and need not to reinforce for this reason, has therefore avoided the increase of weight.

The invention is characterized in a kind of implementation tool, it can unload from anchor, comprises one or more top seals and best cylindrical circular body, and designs to such an extent that can apply negative pressure to it, so that anchor is fallen in the seabed, according to claim 1.

Dependent claims 2-9 has described favorable characteristics of the present invention.

Now by example and contrast the following drawings the present invention is described in detail in detail.

Fig. 1 represent from the side with the top look according to implementation tool of the present invention.

Fig. 2 represents from the side another embodiment according to implementation tool of the present invention of looking with the top.

Fig. 3 is to represent from the order of A to E anchor is how to use according to implementation tool of the present invention to be installed on the seabed or in the seabed.

Fig. 4 represents that one of technical scheme shown in Figure 2 is improved embodiment.

Fig. 1 represents respectively from the side the implementation tool 1 of looking with the top, the form of its cylindrical substantially body 1, and anchor 18 of this body and function is arranged in the anchor body 2 of a triangle.Cylinder body is an osed top at the top, but opens wide in the bottom, and extends upward certain distance from anchor body 2 lower ends easily.Body 1 is by three supports 4 supporting, and support forever is connected in anchor in each side of anchor, and is used for completely or partially absorbing anchor is sunk to the power that seabed 28 causes.Except support 4, perhaps as the substitute of support 4, in the bottom of anchor body 2, support 4 ' can be arranged on the sidepiece of body 1, they are used for being placed on the top of side of anchor, and the power that they completely or partially cause sinker is imported the seabed into.

The lockout mechanism that has latch hook 5 is used for cylinder body 1 is fastened on anchor, has sunk to the seabed until anchor, perhaps is used for anchor pull-up once more.Latch hook 5 is designed to for example to adopt electronic or HM Hydraulic Motor 3 is come out until free position (solid line) from latched position (dotted line) twisting by axle 6, thereby makes implementation tool free and can be pulled up from anchor.An electronic or hydraulically powered pump 7 is arranged on the top of body 1, so that in step-down operation water pump is gone out body.Pump 7 and motor 3 are by circuit 8,9 supplying power.

Fig. 2 represents another embodiment of looking from 0 side and top, and wherein, implementation tool 11 comprises three best cylindrical circular bodies 10, and they interconnect by the framed structure 12 of a triangle.In last example, body 10 is an osed top at the top, but opens wide in the bottom, and they are enough to the power of bearing negative pressure and causing formidably when anchor sinks to the seabed.

In illustrated example, anchor 13 is fastened in the framed structure between the body 10 by swivel hook 14, and detachable, swivel hook in each bight of framework, they are in place and be used for when preparing the implementation tool pull-up engaging to reach with locking frame 15 on the anchor unloading from it when anchor.Swivel hook 14 can be driven by electronic or HM Hydraulic Motor (not shown).

When falling anchor 13, power is passed to anchor by the contact mat on the framed structure 12 16 from implementation tool.

In illustrated example, use pump 21 water pump to be gone out body 10 by the piping 27 that has remote control valve 26.Negative pressure in the body 10 can be used valve 26 controls severally, thereby can control the direction of anchor/implementation tool in step-down operation.For example this is necessary in the uneven situation of sub sea conditions.

Fig. 3 represents to use the sequence chart of from boats and ships anchor body 2 being installed according to implementation tool 1 of the present invention, in illustrated example.What adopted is the implementation tool of kind same as shown in Figure 1.

Expression uses the

capstan arrangement

19,20 on the boats and ships 17 that implementation tool 1 is promoted situation about putting in place in the A of Fig. 3 figure.Blocking device is rotated, and latch hook 5 is hooked under the anchor body 2, promotes the anchor body then and falls to the seabed, shown in B figure.

In case anchor is in place on the seabed, use pump 7 to apply negative pressure to implementation tool, anchor just is pressed into the seabed, shown in C figure.After anchor was fallen, latch hook 5 was turned round to free position, and implementation tool can be pulled up, shown in D figure and E figure.

Be not limited to use one or three cylindrical shape suction bodies with the present invention as implied above as shown in the figure, also can use two or three with upper body, this depends on the structure of anchor.The present invention is not limited to fall anchor, but also can be used for falling the stake of various structures.

Fig. 4 is with three sequence chart F, and G and H represent that one of the present invention shown in Figure 2 is improved embodiment.

Framework 12, aspiration means 10,

lockout mechanism

14,15 and pump and

piping

26,27 are same as shown in Figure 2.But,, set up a passive jack mechanism 22,24 in order can further anchor 13 to be sunk in the seabed.

In graphic situation, jack mechanism comprises three jack bars 22 that are arranged in the guides 24.Jack bar can be tooth bar or serration type, and can use lockout mechanism 23 to be locked on the position that needs, and described lockout mechanism is the form of mobile tongue and/or remote control locking wedge 25.

Jack bar can contact with each bight of anchor easily, but when falling anchor absorption power by having locking wedge 25 lockout mechanism 23 and power is passed to framed structure.The implementation tool that has jack mechanism is worked by following mode: the anchor that has bar 22 13 that at first will be in upper position is fallen a segment distance by water pump is gone out body 10 in the seabed, sees F figure.Unclamp lockout mechanism then, water is pumped into body 10, so that framework and body 10 are promoted to a certain height, shown in G figure with respect to bar 22.Start lockout mechanism once more, and water pump is gone out body 10, so that in the seabed, further fall anchor, shown in H figure.Aforesaid operations can repeat, and has fallen into the distance that is equivalent to the length of bar in seabed until anchor.The advantage of this technical scheme is, because bed knife increases with anchor penetrating in the seabed (degree of depth), so can use small-sized anchor.

Claims

1. one kind is used for anchor (2,13) fall into device in the seabed (28), it is characterized in that: the implementation tool (1 that can unload from anchor, 11) comprise that one or more is osed top and preferably columnar hollow body (1 at the top, 10), and design to such an extent that apply negative pressure, so that anchor (2,13) is fallen in the seabed to it.

2. device according to claim 1, wherein, anchor comprises a polygon, it is characterized in that: an implementation tool comprises one or more hollow circle tube bodies (1,10), they design to such an extent that be fastened in the anchor (2) or anchor (13) outside, and they can unload.

3. device according to claim 2, it comprises a body that is arranged in the anchor (2), it is characterized in that: body (1) is supported by the support on the lower end of each side that is arranged in anchor (4), and/or body is provided with support (4 '), and support (4 ') designs to such an extent that be placed on the top of each side of anchor (2).

4. device according to claim 2, it is characterized in that: body (1) designs to such an extent that use blocking device (3,6,5) be fastened on the anchor (2), and can unload from anchor (2), described blocking device also has one or more lock hooks (5), and it designs to such an extent that can move to a latched position from a release position, on latched position, lock hook extends under anchor.

5. device according to claim 4 is characterized in that: described lock hook uses remote operated pneumatic or electro-motor (3) driving.

6. device according to claim 1, it comprises that two or more are arranged in the outer body (10) of anchor (13), it is characterized in that: body is fixed on the framed structure (12), anchor is by blocking device (14 when anchor proposes or falls in the seabed, 15) be fastened between the interior body (10) of framed structure, and can unload from this position.

7. device according to claim 6, it is characterized in that: described blocking device comprises the swivel hook (14) that is arranged on the framed structure, this swivel hook designs to such an extent that go to a latched position from a release position, and in this latched position, swivel hook contacts with lock bracket (15) on the anchor.

8. device according to claim 6 is characterized in that: when making anchor fall in the seabed, anchor designs to such an extent that contact with reinforcement support pads (16) in the framed structure (12).

9. according to the described device of claim 6 to 8, it is characterized in that: a jack mechanism comprises the jack bar (22) that has lockout mechanism (23,25), and this jack mechanism is used for anchor is further fallen into the seabed.