EP2653615A1 - Jacking system and method for relative movement of a leg with respect to a platform - Google Patents
Jacking system and method for relative movement of a leg with respect to a platform Download PDFInfo
- Publication number
- EP2653615A1 EP2653615A1 EP12164485.0A EP12164485A EP2653615A1 EP 2653615 A1 EP2653615 A1 EP 2653615A1 EP 12164485 A EP12164485 A EP 12164485A EP 2653615 A1 EP2653615 A1 EP 2653615A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leg
- cross
- jacking system
- cross head
- platform
- 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.)
- Granted
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
- E02B17/0836—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks
- E02B17/0872—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks with locking pins engaging holes or cam surfaces
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/06—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for immobilising, e.g. using wedges or clamping rings
Abstract
Description
- The present invention generally relates to a jacking system and a method for relative movement of a leg with respect to a platform.
- Jacking systems are well known in the art and are used for raising and lowering supporting legs of a jacking platform, i.e. a type of mobile platform that is able to stand still on the (sea) floor resting on its supporting legs. Jacking platforms are specifically useful as a base for servicing other water structures, such as offshore wind turbines, long bridges and drilling platforms. The jacking platform can either be self propelled or towed to the structure to be serviced. Upon arrival at the location of the structure, the jacking system is used to jack down the legs onto the (sea) floor. Then "preloading" takes place, where the weight of the platform and additional ballast water are used to drive the legs securely into the (sea) bed so they will not penetrate further while operations are carried out. After preloading the jacking system can be used to raise the entire platform above the water level to a predetermined height or "air gap" so that wave, tidal and current loading acts only on the relatively slender legs and not on the hull. Once the services on the structure have been performed and the jacking platform is no longer needed, the jacking system pulls the legs out of the (sea) floor into a transport position. The jacking platform is then ready to be transported to another location.
- It is noted that applicant already produces jacking systems for raising and lowering supporting legs of a main platform, such as a jack-up rig or a pontoon like structure, in which a fixed cross head is situated on deck of the platform and a travelling cross head is situated above or below the fixed cross head.
- The present invention specifically relates to a jacking system for a jacking platform, having a number of supporting legs, for relative movement of one of the legs with respect to the platform, comprising a number of cross heads, wherein each cross head is independently movable in longitudinal direction of the leg by means of at least one actuator and wherein each cross head is provided with a leg engaging mechanism that is arranged to engage respectively disengage with the leg, and a processor arranged to control the cross heads such that the relative movement of the leg is performed alternately by the cross heads.
- Such a jacking system is known from European patent application
EP2221417 . The known jacking system comprises three yokes that are operated in alternating mode, such that two yokes carry the load of the platform or the leg, while one yoke returns to its starting position. - The present invention has for its object to provide an improved jacking system in terms of load distribution and safety.
- The jacking system according to the present invention is characterized in that the jacking system comprises two cross heads that are positioned opposite one another such that one cross head can be operated in pulling mode and the other cross head can be operated in pushing mode.
- In the jacking system according to the invention the two cross heads are able to operate alternately in pulling mode and pushing mode, both in jacking the legs down onto the (sea) floor as well as in jacking the legs up out of the (sea) floor. This is an advantage since the actuators, for instance hydraulic cylinders, are able to provide more force in pushing mode than in pulling mode under the same conditions. The use of two crossheads or yokes doubles the jacking speed when compared to jacking systems having only one crosshead and allows the jacking system according to the invention to operate at a jacking speed that is comparable to the jacking speed of the known jacking system.
- In a first preferred embodiment the processor is arranged to control the cross heads such that when one of the cross heads is operative in pulling mode or pushing mode, the other cross head returns to its starting position. Precious time can be saved due to the simultaneous operation of the two crossheads in working mode respectively non-working mode.
- According to a further preferred embodiment the processor is arranged to control the cross heads such that the cross heads can assume a takeover position in which both leg engaging mechanisms engage with the leg. In this further preferred embodiment a stable takeover position is guaranteed.
- According to a strong embodiment each crosshead essentially runs along the entire circumference of the leg to provide an optimal load distribution.
- According to a practical embodiment each crosshead comprises three or more actuators, preferably six actuators. According to a further practical embodiment the leg engaging mechanism comprises at least two movable locking pins to be received in the holes of the leg. Suitable pin and hole leg engaging mechanisms are known per se in the art.
- The invention also relates to a jacking system for relative movement of a leg with respect to a platform, comprising a number of cross heads, wherein each cross head is independently movable in longitudinal direction of the leg by means of at least one hydraulic cylinder and wherein each cross head is provided with a leg engaging mechanism that is arranged to engage respectively disengage with the leg, and a processor arranged to control the cross heads, characterized in that, the at least one hydraulic cylinder of each cross head is connected to a fluid reservoir such that a predetermined amount of hydraulic fluid can flow to the reservoir in the engaged position of the cross head to provide a damping effect when the leg touches the seabed.
- According to the invention the jacking system provides a damping effect when one of the legs of the jacking platform absorbs a shock, for instance when the leg hits the (sea) floor in a critical touchdown. All known jacking systems using hydraulic cylinders can profit from such a damping system. Only in a preferred embodiment the jacking system is the jacking system as described above.
- The present invention further relates to a method for relative movement of a leg with respect to a jacking platform comprising the steps of:
- a) Providing a jacking system according to the present invention on a jacking platform having a plurality of legs;
- b) Controlling one cross head to engage on one of the legs and to operate in pulling mode or pushing mode;
- c) Simultaneously with step b) controlling the other cross head to return to its starting position;
- d) Subsequently controlling the cross heads to assume a takeover position in which both leg engaging mechanisms engage with the leg;
- e) Controlling the other cross head to engage on the leg and to operate in opposite pushing mode or pulling mode;
- f) Simultaneously with step e) controlling the one cross head to disengage from the leg to return to its starting position;
- g) Repeat steps b) through f) until the desired relative position of the leg with respect to the platform is reached.
- The invention will now be described in more detail with reference to the drawings, in which:
-
Figure 1 shows a preferred embodiment of a jacking system according to the invention in a first position; -
Figure 2 shows the jacking system according to the invention in a second position; -
Figure 3 shows the jacking system according to the invention in a third position; -
Figure 4 shows the jacking system according to the invention in a fourth position; -
Figures 5A and 5B show part of the jacking system according to the preferred embodiment in cross section in different positions; -
Figures 6A and 6B show another part of the jacking system according tofigures 1-4 in cross section in different positions; -
Figure 7 shows the jacking system according to the invention provided with a first damping system and; -
Figure 8 shows the jacking according to the invention provided with a second damping system. -
Figure 1 shows ajacking system 1 for ajacking platform 2, such as a jack-up mono hull, having ajacking tower 3 attached to theplatform 2 in which a supportingleg 4 is movable. - Each
leg 4 is provided with a number ofleg engaging holes 21 that are arranged to receive a locking pin or locking shaft, likelocking pins 10 respectively 14 present oncrosshead 7 respectively 11 as will be described herein below. - According to the invention the
jacking system 1 further comprises two travellingcrossheads jacking tower 3 in longitudinal direction of theleg 4 by means of jackingcylinders 8 respectively 12. Travellingcrosshead 7 is denoted herein asupper crosshead 7 whereas travellingcrosshead 11 is denoted herein aslower crosshead 11. - According to the invention the
jacking system 1 further comprises a processor (not shown) arranged to control thecross heads leg 4 is performed alternately by thecross heads - Each
cross head leg 4. The engaged, respectively disengaged positions of the crossheads are shown infigures 5A, 5B ,6A and 6B . Infigures 5A, 5B a preferred embodiment ofupper crosshead 7 is shown. Infigures 6A and 6B a preferred embodiment oflower crosshead 11 is shown in cross section. - In
figure 5A locking pins 10 are disengaged fromholes 21 ofleg 4. In this disengaged position the travellingupper crosshead 7 is freely movable with respect toleg 4. - In
figure 5B thelocking pins actuator upper cross head 7 is fixed toleg 4. In the engaged position theupper cross head 7 is bearing the load of theleg 4 or of (part of) theplatform 2. - In
figure 6A locking pins 14 are disengaged fromholes 21 ofleg 4. In this disengaged position the travellinglower crosshead 7 is freely movable with respect toleg 4. - In
figure 6B thelocking pins actuator lower cross head 11 is fixed toleg 4. In the engaged position thelower cross head 11 is bearing the load of theleg 4 or of (part of) theplatform 2. - Preferably
crossheads preferred embodiment crosshead pins actuator - In the preferred embodiment the shape of
crosshead tower 3 and/or theleg 4 and can be any other geometrical shape, f.i. a circular or rectangular shape. - Jacking
tower 3 is further provided with a fixedcrosshead 5 havinglocking pins 6 that can be received byleg engaging holes 21 for fixing theleg 4 to thetower 3. - Referring to
figures 1 through 4 showing the jacking system according to the invention in four different positions the movement of theleg 4 relative to theplatform 2 is described. The described and shown movement relates to a downward movement of theleg 4 relative to theplatform 2, f.i. when theleg 4 is jacked down onto the seabed. This movement corresponds to an upward movement of theplatform 2 relative to theleg 4, f.i. when theplatform 2 is climbing up theleg 4 to rise above sea level. - The method according to the invention comprises the following steps
- a) Controlling one
cross head legs 4 and to operate in pulling mode or pushing mode; - b) Simultaneously with step b) controlling the
other cross head - c) Subsequently controlling the cross heads 7, 11 to assume a takeover position in which both leg engaging mechanisms engage with the
leg 4; - d) Controlling the
other cross head leg 4 and to operate in opposite pushing mode or pulling mode; - e) Simultaneously with step d) controlling the one
cross head leg 4 to return to its starting position; - f) Repeat steps a) through e) until the desired relative position of the
leg 4 with respect to theplatform 2 is reached. - The four positions corresponding to these method steps are shown in
figures 1-4 . - In
figure 1 cross head 7 operates in pushing mode whereascross head 11 operates in pulling mode.Cross head 7 is in its starting position wherein upper crosshead locking pins 10 engage intoholes 21, whereascross head 11 is in the end position wherein lower crosshead locking pins 14 disengage fromholes 21. - In
figure 2 the jackingcylinders 8 move to perform a working stroke in the direction of the downward arrows to pushleg 4 downwards. Simultaneously jackingcylinders 12 perform a non-working stroke (return stroke) in the direction of the upwards arrows to allow thelower cross head 11 to return to its starting position. - In
figure 3 the jacking system takes up its takeover position. In this takeover position both lockingpins holes 21 ofleg 4. - In
figure 4 upper crosshead locking pins 10 disengage fromholes 21. Next jackingcylinders 12 are actuated to perform a working stroke in the direction of the downward arrows. During the working stroke the jackingcylinders 12pull leg 4 downwards. Simultaneously the jackingcylinders 8 perform a non-working or return stroke in the direction of the upper arrows. Theupper cross head 7 returns to its starting position. - The jacking
system 1 then returns to the first position shown infigure 1 . The jacking system next assumes a takeover position in which all lockingpins holes 21. - The jacking
system 1 repeats the sequence shown infigures 1 through 4 until thelegs 4 are jacked down onto the seabed and/or theplatform 2 has reached a safe position above sea level. - Each
crosshead leg guide support 19 for guiding theleg 4. The leg guide support has a shape corresponding to the shape ofleg 4. - Inside tower 3 a
leg guide support 20 is present for guiding theleg 4. The jackingtower 3 is further provided with aguide frame 17 for guiding theupper crosshead 7 and aguide frame 18 for guiding thelower crosshead 11. In the preferred embodiment shown three guide frames are present. The number of guide frames can however differ depending on the circumstances. -
Figures 7 and8 relate to a damping safety system that is suitable for any jacking system. Infigures 7 and8 the preferred embodiment of the jackingsystem 1 according to the invention is provided with such a damping safety system. The damping safety system according to the invention comprises a hydraulic fluid reservoir oraccumulator 15 that is coupled toupper crosshead 7, more specifically coupled to jackingcylinders 8 ofupper crosshead 7. The damping safety system is arranged such that when a hydraulic pressure in the jacking cylinders reaches a predetermined threshold value, hydraulic fluid is allowed to flow into reservoir oraccumulator 15. This allows the jacking cylinders to move over a certain distance denoted as X. The jacking cylinders are then able to absorb a shock that may occur when theleg 4 touches the seabed in a critical touchdown. Preferably each travelling crosshead is provided with its own hydraulic fluid reservoir or accumulator. Infigure 8 thereforelower crosshead 11, more specially jackingcylinders 12 oflower crosshead 11 are hydraulically coupled to a hydraulic fluid reservoir oraccumulator 16. - It is noted that either one larger accumulator may be used per cross head or one smaller accumulator may be used per cylinder. Suitable accumulators are available on the market. However in applicants view the use of such accumulators for providing a damping safety system relating to jacking cylinders forming part of a jacking system is novel in the art and solves the problem of absorbing the shock related to a critical touchdown of one of the legs of a jacking platform. The damping safety system according to the invention will attribute to a longer lifecycle of vital components of each jacking system known in the art.
- The invention is of course not limited to the described and shown preferred embodiment. The invention relates generally to any embodiment falling within the scope of protection as defined in the claims and as seen in the light of the foregoing description and accompanying drawings.
Claims (9)
- Jacking system (1) for a jacking platform (2), having a number of supporting legs (4), for relative movement of one of the legs (4) with respect to the platform (2), comprising a number of cross heads (7, 11), wherein each cross head (7, 11) is independently movable in longitudinal direction of the leg by means of at least one actuator (8, 12) and wherein each cross head (7, 11) is provided with a leg engaging mechanism that is arranged to engage respectively disengage with the leg (4), and a processor arranged to control the cross heads (7, 11) such that the relative movement of the leg (4) is performed alternately by the cross heads (7, 11), characterized in that , the jacking system (1) comprises two cross heads (7, 11) that are positioned opposite one another such that one cross head can be operated in pulling mode and the other cross head can be operated in pushing mode.
- Jacking system according to claim 1, wherein the processor is arranged to control the cross heads (7, 11) such that when one of the cross heads (7, 11) is operative in pulling mode or pushing mode, the other cross head returns to its starting position.
- Jacking system according to claim 1 or 2, wherein the processor is arranged to control the cross heads (7, 11) such that the cross heads (7, 11) can assume a takeover position in which both leg engaging mechanisms engage with the leg (4).
- Jacking system according to claim 1, 2 or 3, wherein each cross head (7, 11) essentially runs along the entire circumference of the leg (4).
- Jacking system according to claim 4, wherein each cross head (7, 11) comprises three or more actuators (8, 12), preferably six actuators (8, 12).
- Jacking system according to one or more of the preceding claims, wherein the leg engaging mechanism comprises at least two movable locking pins (9, 13) to be received in holes (21) of the leg (4).
- Jacking system for relative movement of a leg (4) with respect to a platform (2), comprising a number of cross heads, wherein each cross head is independently movable in longitudinal direction of the leg by means of at least one hydraulic cylinder (8, 12) and wherein each cross head is provided with a leg engaging mechanism that is arranged to engage respectively disengage with the leg, and a processor arranged to control the cross heads, characterized in that , the at least one hydraulic cylinder (8, 12) of each cross head is connected to a fluid reservoir (15, 16) such that a predetermined amount of hydraulic fluid can flow to the reservoir in the engaged position of the cross head (7, 11) to provide a damping effect when the leg (4) touches the seabed.
- Jacking system according to claim 7, wherein the jacking system is the jacking system (1) according to one or more of claims 1-6.
- Method for relative movement of a leg (4) with respect to a platform (2) comprising the steps ofa) Providing a jacking system (1) according to one or more of claims 1-6 on a jacking platform (2) having a plurality of legs (4);b) Controlling one cross head (7, 11) to engage on one of the legs (4) and to operate in pulling mode or pushing mode;c) Simultaneously with step b) controlling the other cross head (7, 11) to return to its starting position;d) Subsequently controlling the cross heads (7, 11) to assume a takeover position in which both leg engaging mechanisms engage with the leg (4);e) Controlling the other cross head (7, 11) to engage on the leg (4) and to operate in opposite pushing mode or pulling mode;f) Simultaneously with step e) controlling the one cross head (7, 11) to disengage on the leg (4) to return to its starting position;g) Repeat steps b) through f) until the desired relative position of the leg (4) with respect to the platform (2) is reached.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12164485T PL2653615T3 (en) | 2012-04-17 | 2012-04-17 | Jacking system and method for relative movement of a leg with respect to a platform |
EP12164485.0A EP2653615B1 (en) | 2012-04-17 | 2012-04-17 | Jacking system and method for relative movement of a leg with respect to a platform |
ES12164485.0T ES2566170T3 (en) | 2012-04-17 | 2012-04-17 | Lifting system and procedure for the relative movement of a leg with respect to a platform |
DK12164485.0T DK2653615T3 (en) | 2012-04-17 | 2012-04-17 | Lifting system and method for the relative movement of one leg relative to a platform |
HRP20160264TT HRP20160264T1 (en) | 2012-04-17 | 2016-03-14 | Jacking system and method for relative movement of a leg with respect to a platform |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12164485.0A EP2653615B1 (en) | 2012-04-17 | 2012-04-17 | Jacking system and method for relative movement of a leg with respect to a platform |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2653615A1 true EP2653615A1 (en) | 2013-10-23 |
EP2653615B1 EP2653615B1 (en) | 2016-01-20 |
Family
ID=45976805
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12164485.0A Not-in-force EP2653615B1 (en) | 2012-04-17 | 2012-04-17 | Jacking system and method for relative movement of a leg with respect to a platform |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2653615B1 (en) |
DK (1) | DK2653615T3 (en) |
ES (1) | ES2566170T3 (en) |
HR (1) | HRP20160264T1 (en) |
PL (1) | PL2653615T3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105672236A (en) * | 2016-04-14 | 2016-06-15 | 上海尚鉴机械工程有限公司 | Pin type rapid lifting mechanism and lifting method thereof |
CN105672235A (en) * | 2016-04-05 | 2016-06-15 | 上海尚鉴机械工程有限公司 | Battle pin type ocean platform lifting device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106087930B (en) * | 2016-07-05 | 2018-02-06 | 武汉船用机械有限责任公司 | Lifting self-elevating platform device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5276602U (en) * | 1976-11-26 | 1977-06-08 | ||
EP2221417A1 (en) | 2009-02-20 | 2010-08-25 | Marine Structure Consultants (MSC) B.V. | Jacking system for a leg of a jack-up platform |
WO2011060880A1 (en) * | 2009-11-18 | 2011-05-26 | Robert Bosch Gmbh | Offshore platform and method for controlling an offshore platform |
-
2012
- 2012-04-17 EP EP12164485.0A patent/EP2653615B1/en not_active Not-in-force
- 2012-04-17 DK DK12164485.0T patent/DK2653615T3/en active
- 2012-04-17 PL PL12164485T patent/PL2653615T3/en unknown
- 2012-04-17 ES ES12164485.0T patent/ES2566170T3/en active Active
-
2016
- 2016-03-14 HR HRP20160264TT patent/HRP20160264T1/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5276602U (en) * | 1976-11-26 | 1977-06-08 | ||
EP2221417A1 (en) | 2009-02-20 | 2010-08-25 | Marine Structure Consultants (MSC) B.V. | Jacking system for a leg of a jack-up platform |
WO2011060880A1 (en) * | 2009-11-18 | 2011-05-26 | Robert Bosch Gmbh | Offshore platform and method for controlling an offshore platform |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105672235A (en) * | 2016-04-05 | 2016-06-15 | 上海尚鉴机械工程有限公司 | Battle pin type ocean platform lifting device |
CN105672236A (en) * | 2016-04-14 | 2016-06-15 | 上海尚鉴机械工程有限公司 | Pin type rapid lifting mechanism and lifting method thereof |
Also Published As
Publication number | Publication date |
---|---|
DK2653615T3 (en) | 2016-03-29 |
PL2653615T3 (en) | 2016-08-31 |
HRP20160264T1 (en) | 2016-06-03 |
ES2566170T3 (en) | 2016-04-11 |
EP2653615B1 (en) | 2016-01-20 |
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