EP0035629A2 - Dispositif pour lever et abaisser une plate-forme de forage flottante - Google Patents

Dispositif pour lever et abaisser une plate-forme de forage flottante Download PDF

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Publication number
EP0035629A2
EP0035629A2 EP81100301A EP81100301A EP0035629A2 EP 0035629 A2 EP0035629 A2 EP 0035629A2 EP 81100301 A EP81100301 A EP 81100301A EP 81100301 A EP81100301 A EP 81100301A EP 0035629 A2 EP0035629 A2 EP 0035629A2
Authority
EP
European Patent Office
Prior art keywords
cable
winch
platform
support legs
lifting
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
Application number
EP81100301A
Other languages
German (de)
English (en)
Other versions
EP0035629A3 (en
EP0035629B1 (fr
Inventor
Heribert Konrad Mayr
Heinz Lietzke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schiess-Defries Hebezeuge und Transporteinrichtungen GmbH
Deutsche Babcock AG
Original Assignee
Schiess-Defries Hebezeuge und Transporteinrichtungen GmbH
Deutsche Babcock AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schiess-Defries Hebezeuge und Transporteinrichtungen GmbH, Deutsche Babcock AG filed Critical Schiess-Defries Hebezeuge und Transporteinrichtungen GmbH
Publication of EP0035629A2 publication Critical patent/EP0035629A2/fr
Publication of EP0035629A3 publication Critical patent/EP0035629A3/de
Application granted granted Critical
Publication of EP0035629B1 publication Critical patent/EP0035629B1/fr
Expired legal-status Critical Current

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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
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
    • E02B17/024—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform shock absorbing means for the supporting construction

Definitions

  • the invention relates to a device for lifting and lowering a buoyant offshore platform which is provided with support legs which can be moved relative to it and which are supported in the operating state on the seabed or on a substructure lowered to the seabed.
  • the support legs are lowered towards the sea floor and the platform is then lifted out of the water on the fixed support legs until the required height is reached above sea level.
  • Placing the support legs on the substructure is always a critical operation, which, unless special measures are taken, can only be carried out in favorable weather conditions. In unfavorable sea conditions, the platform swinging up and down with the waves can hit the substructure several times with the supporting legs before it is finally fixed. This can lead to considerable damage.
  • the invention has for its object to develop a device of the type mentioned in such a way that even in unfavorable sea conditions, the support legs can be put on smoothly or essentially smoothly.
  • This object is achieved in that the lifting device is blocked against a downward movement when the support legs and the floating platform are at the highest point of the wave movement. It is preferably proposed that two lifting devices designed as cable winches are provided and that when the support legs and floating platform are attached, the drive of the one lifting device is switched off and the cable winch of the other lifting device is released in the winding direction and can be blocked in the winding direction.
  • the support legs have been placed on an offshore platform which is provided with such a device according to the invention, only the platform is raised in the case of an ascending wave, while the support legs do not change their position. If the floating platform has just reached the highest point of the wave movement, it is ensured that it engages in this position and does not sink again with the falling wave. If another wave with a higher wave crest follows on this wave, the platform is raised again and hung again at the highest point of the wave movement. In this way, the platform is prevented from sinking with the falling wave. The platform can therefore no longer swing up and down with the waves and thus damage the support legs or the substructure.
  • the floating platform 1 has a rectangular or square cross section and is provided with four support legs 2 which can be moved and raised and lowered relative to it. This platform 1 is towed with the support legs 2_ pulled up over the place of erection at sea. After reaching the intended position, the support legs 2 are lowered with the aid of the lifting device described below until they rest on the sea floor or on a substructure lowered on the sea floor. The platform 1 is then raised to the desired height above sea level. In the operating state, the support legs 2 of the platform are supported directly or indirectly on the sea floor.
  • the lifting device consists of two single-acting lifting devices in the form of cable winches 3 and 4, which can be driven independently of one another.
  • the two winches 3 and 4 are arranged on a common base frame 17 on the platform 1. In Figure 1, the two winches 3 and 4 are shown offset by 90 0 for easier understanding.
  • Each of the four support legs 2 is provided with at least one such device.
  • the first winch 3 serves to lower and raise the support leg 2 and preferably works on a simple rope strand.
  • the cable 5 is guided over a arranged on the platform 1 to diverting pulley 6 'the attachment point at the foot of the support leg. 2
  • the second winch 4 serves to raise and lower the platform 1 and works on a multiple rope strand.
  • the lifting cable 7 is guided for the introduction of load onto the support leg 2 via an upper roller block 8 which is arranged on a yoke 9 of the support leg 2.
  • the lower roller block 1G with the fixed rope point is located directly in front of the winch 4 on the platform 1.
  • the cable winches 3 and 4 are each driven via a ratchet wheel 11 which is connected to the cable drum 12 and 13, respectively.
  • the head of a piston rod 15 engages in the locking teeth 14 of the driving ratchet wheel 11.
  • the piston rod 15 is guided in a hydraulic cylinder 16 and connected to a piston acted on on both sides.
  • the hydraulic cylinder 16 is pivotally attached to the base frame 17 carrying the cable winches 3 and 4.
  • a likewise arranged pivotably on the base frame 17 cylinder arrangement 18 pulls the head of the piston rod 15 into the engaged position or pushes it into the idle position.
  • a detent consisting of a pivoting link 19 and a ratchet pin 20 is provided.
  • the pivot pawl 19 is pivotally arranged on the base frame 17 and, like the piston rod 15, is brought into engagement position by a cylinder arrangement 18.
  • the first cable winch 3 is provided with a permanent cable tensioning device which consists of a low-kickback freewheel and a drive motor 30.
  • the freewheel is designed as a sprag freewheel, the sprag 39 of which are arranged between the ratchet wheel 11 and the cable drum 12.
  • the drive motor 30 is flanged to the base frame 17 and drives a pinion 31 which is in engagement with a ring gear 32 fastened to the cable drum 12.
  • the drive motor 30 exerts a torque on the cable drum 12 in the winding direction of the cable 5.
  • the second winch 4 is also provided with a slack rope safety device.
  • This consists of a cable 22 loaded by a weight 21, which is wound around the cable drum 13 of the second cable winch 4 against the winding direction of the lifting cable 7.
  • the weight 21 is connected to a loose roller 33.
  • the rope 22 wound around the rope drum 13 is guided via the roller 33 to a compensation winch 23 set up on the platform 1. Due to the weight 21 in connection with the compensation winch 23, a torque is generated on the cable drum 13 and the lifting cable 7 is thereby wound up or unwound under tension.
  • the compensation winch 23 ensures that the weight 21 is always held at the same altitude. When the compensation winch 23 is blocked, the weight 21 alone generates the torque, changing its altitude.
  • the cable drum 13 of the second cable winch 4 consists of a hollow cylinder 24 which is slidably guided on a statically stressed base drum 26.
  • the hollow cylinder 24 is stressed dynamically with a low load.
  • the hollow cylinder 24 forms a unit with the base drum 25.
  • the detent formed from the pawl 19 and the pawl 20 and the hydraulic cylinders 16 of the drive of the cable drum 13 of the second winch are provided with a hydraulic safety detent, the circuit diagram of which is shown in FIG.
  • the lock consists of a pump 34, which is driven by the cable drum 13 of the second cable winch 4, and two locking cylinders 38.
  • the pump 34 only supplies pressure medium via a hydraulic line 35 when the cable drum 13 rotates in the direction of rotation 1 corresponding to a downward movement the upper piston chambers of the locking cylinder 38.
  • a valve 36 is provided in the hydraulic line 35, which must be activated before unlocking.
  • the fixed rope points of the lifting rope 7 are equipped with communicating compensating cylinders 26.
  • These compensating cylinders 26 are held in a bearing fork 27 which can be pivoted about a horizontal axis and which are connected to the platform 1.
  • a piston 28 with a piston rod 29 is guided within the compensating cylinder 26.
  • the lifting rope 7 is attached to the piston rod 29.
  • the floating platform 1 carries out oscillations in the sea. If the platform 1 is in a wave trough, a support leg 2 touches the sea floor or a substructure placed on the sea floor, the hydraulic pressure in the hydraulic cylinder 16 of the first cable winch 3 is reduced. If all hydraulic cylinders have been reduced in pressure, a lowering step is carried out .
  • the piston rod 15 and the pawl 19 of the first cable winch 3 are disengaged by the cylinder arrangements 18 and the first cable winch 3 is thereby switched to idle. So that the support legs 2 put on.
  • the idle position of the first winch 3 is characterized in that the platform 1 can carry out all the movements in rough seas without a connection between the platform 1 and the support legs 2, apart from friction.
  • the distance between the upper roller block 8 and the lower roller block 10 is shortened.
  • the lifting rope that is produced here is wound up with the aid of the weight 21 and) of the compensation winch 23.
  • the platform 1 moves in rough seas, the hoisting rope 7 being wound up and unwound under tension by the weight 21 after the compensation winch 23 has been blocked.
  • the command "snap" is given via a control. This has the effect that, as soon as the platform 1 is in the upward movement, the piston rod 15 and the pawl 19 of the second cable winch 4 are automatically engaged. As a result, the cable drum 13 of the second cable winch 4 is prevented from rotating in the downward direction of the platform 1 against the lifting direction. In this way, the platform 1 is suspended in the uppermost sea position and is thereby connected to the support legs 2. If platform 1 is raised even further by a subsequent higher shaft, then it is automatically suspended in the new top position.
  • the step-by-step lifting process of the platform 1 begins immediately.
  • Different stroke lengths of a winch 4 for example when changing to a different rope position, are compensated for by the compensating cylinders 26 at the fixed rope point.
  • the platform is to be moved after a dwell time of about 8 to 10 years, the platform is lowered according to the fundamentally same scheme, the same processes taking place in the opposite direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Jib Cranes (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Revetment (AREA)
  • Earth Drilling (AREA)
EP81100301A 1980-03-06 1981-01-16 Dispositif pour lever et abaisser une plate-forme de forage flottante Expired EP0035629B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3008585 1980-03-06
DE19803008585 DE3008585A1 (de) 1980-03-06 1980-03-06 Vorrichtung zum heben und senken einer schwimmfaehigen offshore-plattform

Publications (3)

Publication Number Publication Date
EP0035629A2 true EP0035629A2 (fr) 1981-09-16
EP0035629A3 EP0035629A3 (en) 1982-03-03
EP0035629B1 EP0035629B1 (fr) 1984-08-15

Family

ID=6096438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100301A Expired EP0035629B1 (fr) 1980-03-06 1981-01-16 Dispositif pour lever et abaisser une plate-forme de forage flottante

Country Status (7)

Country Link
EP (1) EP0035629B1 (fr)
JP (1) JPS57210A (fr)
BR (1) BR8101379A (fr)
CA (1) CA1155307A (fr)
DE (1) DE3008585A1 (fr)
MX (1) MX152501A (fr)
NO (1) NO154277C (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234177A1 (de) * 1982-09-15 1984-03-15 Dyckerhoff & Widmann AG, 8000 München Verfahren zum absenken der plattform einer kuenstlichen insel auf eine unterkonstruktion sowie einrichtung zum durchfuehren des verfahrens

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60195324U (ja) * 1984-05-31 1985-12-26 株式会社　カノボ−リング スパツト台船
JPS62211216A (ja) * 1986-03-08 1987-09-17 Seidensha:Goushi コンベア装置における搬送用パレツトの昇降装置
JPH0736915Y2 (ja) * 1987-03-25 1995-08-23 株式会社三隆製作 搬送容器の移載機構
JPH0256321A (ja) * 1988-08-23 1990-02-26 Matsushita Electric Works Ltd 搬送装置
JP2507950Y2 (ja) * 1992-09-04 1996-08-21 碧南特殊機械株式会社 窯業製品における受型ピッチ送りコンベア

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB433392A (en) * 1933-07-22 1935-08-14 Kampnagel Ag Improvements in and relating to mechanism for lifting floating bodies
US3003454A (en) * 1958-12-10 1961-10-10 Shatoska Henry Propelling means for dredge barges
NL142746B (nl) * 1965-01-08 1974-07-15 Gusto Fa Nv Booreiland of dergelijk platform.
NL7400716A (en) * 1974-01-18 1975-07-22 Hattum & Blankevoort Bv Shock absorber for off-shore oil well operating platform - with legs able to be lowered to the seabed
NL7508496A (nl) * 1974-07-30 1976-02-03 Willem Josef George Strolenber Inrichting voor het omhoog brengen of neerlaten van een last.
US4002038A (en) * 1975-10-06 1977-01-11 Raymond International Inc. Method and apparatus for rapid erection of offshore towers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234177A1 (de) * 1982-09-15 1984-03-15 Dyckerhoff & Widmann AG, 8000 München Verfahren zum absenken der plattform einer kuenstlichen insel auf eine unterkonstruktion sowie einrichtung zum durchfuehren des verfahrens

Also Published As

Publication number Publication date
EP0035629A3 (en) 1982-03-03
NO810137L (no) 1981-09-07
NO154277B (no) 1986-05-12
DE3008585A1 (de) 1981-09-17
MX152501A (es) 1985-08-14
JPS57210A (en) 1982-01-05
CA1155307A (fr) 1983-10-18
EP0035629B1 (fr) 1984-08-15
BR8101379A (pt) 1981-09-08
NO154277C (no) 1986-08-20

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