EP2653615B1 - 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
- EP2653615B1 EP2653615B1 EP12164485.0A EP12164485A EP2653615B1 EP 2653615 B1 EP2653615 B1 EP 2653615B1 EP 12164485 A EP12164485 A EP 12164485A EP 2653615 B1 EP2653615 B1 EP 2653615B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leg
- jacking
- travelling
- cross head
- jacking system
- 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.)
- Not-in-force
Links
Images
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
Definitions
- 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.
- the jacking system Upon arrival at the location of the structure, the jacking system is used to jack down the legs onto the (sea) floor.
- 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.
- 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.
- 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 defined by claim 1 and comprises, inter alia, 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.
- 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.
- 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.
- a jacking system according to the preamble of claim 1 is known from JP 52076602 .
- the jacking system according to the invention is characterised in that the jacking tower is further provided with a fixed crosshead having locking pins that can be received by leg engaging holes for fixing the leg to the tower. Suitable pin and hole leg engaging mechanisms are known per se in the art.
- 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.
- 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.
- each crosshead essentially runs along the entire circumference of the leg to provide an optimal load distribution.
- 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.
- the invention also relates to a jacking system wherein the at least one actuator is a hydraulic cylinder, and 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 travelling cross head to provide a damping effect when the leg touches the seabed.
- the at least one actuator is a hydraulic cylinder
- 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 travelling cross head to provide a damping effect when the leg touches the seabed.
- 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, as defined by claim 9, for relative movement of a leg with respect to a jacking platform comprising the steps of:
- Figure 1 shows a jacking system 1 for a jacking platform 2, such as a jack-up mono hull, having a jacking tower 3 attached to the platform 2 in which a supporting leg 4 is movable.
- a jacking platform 2 such as a jack-up mono hull
- Each leg 4 is provided with a number of leg engaging holes 21 that are arranged to receive a locking pin or locking shaft, like locking pins 10 respectively 14 present on crosshead 7 respectively 11 as will be described herein below.
- the jacking system 1 further comprises two travelling crossheads 7, 11 that are each movable with respect to the jacking tower 3 in longitudinal direction of the leg 4 by means of jacking cylinders 8 respectively 12.
- Travelling crosshead 7 is denoted herein as upper crosshead 7
- travelling crosshead 11 is denoted herein as lower crosshead 11.
- the jacking system 1 further comprises a processor (not shown) 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.
- Each cross head 7, 11 is provided with a leg engaging mechanism that is arranged to engage respectively disengage with the leg 4.
- the engaged, respectively disengaged positions of the crossheads are shown in figures 5A, 5B , 6A and 6B .
- figures 5A, 5B a preferred embodiment of upper crosshead 7 is shown.
- figures 6A and 6B a preferred embodiment of lower crosshead 11 is shown in cross section.
- the locking pins 10A, 10B and 10C are each actuated by the associated actuator 9A, 9B and 9C towards the engaged position in which the upper cross head 7 is fixed to leg 4. In the engaged position the upper cross head 7 is bearing the load of the leg 4 or of (part of) the platform 2.
- the locking pins 14A, 14B and 14C are each actuated by the associated actuator 13A, 13B and 13C towards the engaged position in which the lower cross head 11 is fixed to leg 4. In the engaged position the lower cross head 11 is bearing the load of the leg 4 or of (part of) the platform 2.
- crossheads 7 and 11 are identical.
- crosshead 7, 11 is provided with three locking pins 10A, 10B, 10C respectively 14A, 14B, 14C.
- Each locking pin is driven by an actuator 9A, 9B, 9C respectively 13A, 13B, 13C.
- crosshead 7, 11 is generally hexagonal. It is noted that the shape is adaptable to the shape of the jacking tower 3 and/or the leg 4 and can be any other geometrical shape, f.i. a circular or rectangular shape.
- Jacking tower 3 is further provided with a fixed crosshead 5 having locking pins 6 that can be received by leg engaging holes 21 for fixing the leg 4 to the tower 3.
- FIG. 1 showing the jacking system according to the invention in four different positions the movement of the leg 4 relative to the platform 2 is described.
- the described and shown movement relates to a downward movement of the leg 4 relative to the platform 2, f.i. when the leg 4 is jacked down onto the seabed.
- This movement corresponds to an upward movement of the platform 2 relative to the leg 4, f.i. when the platform 2 is climbing up the leg 4 to rise above sea level.
- the method according to the invention comprises the following steps
- cross head 7 operates in pushing mode whereas cross head 11 operates in pulling mode.
- Cross head 7 is in its starting position wherein upper crosshead locking pins 10 engage into holes 21, whereas cross head 11 is in the end position wherein lower crosshead locking pins 14 disengage from holes 21.
- the jacking cylinders 8 move to perform a working stroke in the direction of the downward arrows to push leg 4 downwards.
- Simultaneously jacking cylinders 12 perform a non-working stroke (return stroke) in the direction of the upwards arrows to allow the lower cross head 11 to return to its starting position.
- upper crosshead locking pins 10 disengage from holes 21.
- Next jacking cylinders 12 are actuated to perform a working stroke in the direction of the downward arrows.
- the jacking cylinders 12 pull leg 4 downwards.
- the jacking cylinders 8 perform a non-working or return stroke in the direction of the upper arrows.
- the upper cross head 7 returns to its starting position.
- the jacking system 1 then returns to the first position shown in figure 1 .
- the jacking system next assumes a takeover position in which all locking pins 10 and 14 engage into holes 21.
- the jacking system 1 repeats the sequence shown in figures 1 through 4 until the legs 4 are jacked down onto the seabed and/or the platform 2 has reached a safe position above sea level.
- Each crosshead 7, 11 is provided with a leg guide support 19 for guiding the leg 4.
- the leg guide support has a shape corresponding to the shape of leg 4.
- a leg guide support 20 is present for guiding the leg 4.
- the jacking tower 3 is further provided with a guide frame 17 for guiding the upper crosshead 7 and a guide frame 18 for guiding the lower crosshead 11.
- three guide frames are present. The number of guide frames can however differ depending on the circumstances.
- FIGS 7 and 8 relate to a damping safety system that is suitable for any jacking system.
- the damping safety system according to the invention comprises a hydraulic fluid reservoir or accumulator 15 that is coupled to upper crosshead 7, more specifically coupled to jacking cylinders 8 of upper 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 or accumulator 15. This allows the jacking cylinders to move over a certain distance denoted as X.
- each travelling crosshead is provided with its own hydraulic fluid reservoir or accumulator.
- more specially jacking cylinders 12 of lower crosshead 11 are hydraulically coupled to a hydraulic fluid reservoir or accumulator 16.
- Suitable accumulators are available on the market.
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
- Revetment (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES12164485.0T ES2566170T3 (es) | 2012-04-17 | 2012-04-17 | Sistema de elevación y procedimiento para el movimiento relativo de una pata con respecto a una plataforma |
PL12164485T PL2653615T3 (pl) | 2012-04-17 | 2012-04-17 | Układ podnoszenia i sposób względnego przemieszczania nogi względem platformy |
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 |
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 (hr) | 2012-04-17 | 2016-03-14 | Sustav za podizanje i postupak relativnog pokreta nožice u odnosu na platformu |
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 EP2653615A1 (en) | 2013-10-23 |
EP2653615B1 true 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 (es) |
DK (1) | DK2653615T3 (es) |
ES (1) | ES2566170T3 (es) |
HR (1) | HRP20160264T1 (es) |
PL (1) | PL2653615T3 (es) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106087930A (zh) * | 2016-07-05 | 2016-11-09 | 武汉船用机械有限责任公司 | 自升式平台升降装置 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105672235B (zh) * | 2016-04-05 | 2017-04-05 | 上海尚鉴机械工程有限公司 | 环销式海洋平台升降装置 |
CN105672236A (zh) * | 2016-04-14 | 2016-06-15 | 上海尚鉴机械工程有限公司 | 插销式快速升降机构及其升降方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5247281Y2 (es) * | 1976-11-26 | 1977-10-27 | ||
NL2002549C2 (en) | 2009-02-20 | 2010-08-24 | Marine Structure Consul | Jacking system for a leg of a jack-up platform. |
CN102713076B (zh) * | 2009-11-18 | 2015-01-28 | 罗伯特·博世有限公司 | 离岸平台和用于控制离岸平台的方法 |
-
2012
- 2012-04-17 DK DK12164485.0T patent/DK2653615T3/en active
- 2012-04-17 EP EP12164485.0A patent/EP2653615B1/en not_active Not-in-force
- 2012-04-17 ES ES12164485.0T patent/ES2566170T3/es active Active
- 2012-04-17 PL PL12164485T patent/PL2653615T3/pl unknown
-
2016
- 2016-03-14 HR HRP20160264TT patent/HRP20160264T1/hr unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106087930A (zh) * | 2016-07-05 | 2016-11-09 | 武汉船用机械有限责任公司 | 自升式平台升降装置 |
CN106087930B (zh) * | 2016-07-05 | 2018-02-06 | 武汉船用机械有限责任公司 | 自升式平台升降装置 |
Also Published As
Publication number | Publication date |
---|---|
DK2653615T3 (en) | 2016-03-29 |
ES2566170T3 (es) | 2016-04-11 |
EP2653615A1 (en) | 2013-10-23 |
HRP20160264T1 (hr) | 2016-06-03 |
PL2653615T3 (pl) | 2016-08-31 |
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