EP0035629B1 - Device for raising and lowering a floatable offshore platform - Google Patents

Device for raising and lowering a floatable offshore platform Download PDF

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Publication number
EP0035629B1
EP0035629B1 EP81100301A EP81100301A EP0035629B1 EP 0035629 B1 EP0035629 B1 EP 0035629B1 EP 81100301 A EP81100301 A EP 81100301A EP 81100301 A EP81100301 A EP 81100301A EP 0035629 B1 EP0035629 B1 EP 0035629B1
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EP
European Patent Office
Prior art keywords
cable
platform
winch
drum
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.)
Expired
Application number
EP81100301A
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German (de)
French (fr)
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EP0035629A3 (en
EP0035629A2 (en
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
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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/en
Publication of EP0035629A3 publication Critical patent/EP0035629A3/en
Application granted granted Critical
Publication of EP0035629B1 publication Critical patent/EP0035629B1/en
Expired legal-status Critical Current

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    • 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, in the operating state, are supported on the seabed or on a substructure lowered to the seabed, the lifting device then in each case counter to a downward direction directional movement is blocked when the support legs and the floating platform are at the highest point of the wave movement.
  • the invention has for its object to provide a rope system for lifting and lowering a buoyant platform, with which it is possible to raise the platform in such a way that the floating platform can be held in place at the highest point of a wave motion when the support legs are attached .
  • This object is achieved according to the invention in that two lifting devices designed as cable winches are provided, and in that when the support legs and floating platform are attached, the drive of one cable winch is switched off and the other cable winch is released in the winding direction and can be blocked in the winding direction.
  • the buoyant platform 1 has a rectangular or square cross section and is provided with four support legs 2 which can be moved and raised relative to it. This platform 1 is towed with the support legs 2 raised 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 the 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 ° for easier understanding.
  • Each of the four support legs 2 is provided with at least one such device.
  • the first winch 3 is used to lower and raise the support leg 2 and preferably works on a simple rope strand.
  • the rope 5 is guided over a deflection roller 6 arranged on the platform 1 to the fastening 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 10 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 pivot 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, which changes 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.
  • 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 upper piston spaces of the locking cylinder 38. When these piston spaces are pressurized, the piston rod 15 and the pawl 19 are released for engagement.
  • a valve 36 is provided in the hydraulic line 35, which must be activated before unlocking.
  • the rope fixed 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 device according to the invention works in the following way.
  • the lowering of the support legs 2 is initiated from a central control station.
  • the drive of the first winch 3 is engaged, while the head of the piston rod 15 and the pawl 19 of the second winch 4 are disengaged.
  • all four support legs 2 are gradually lowered synchronously.
  • 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 perform all 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 platform 1 moves after putting on the support legs 2 in the sea, the lifting rope 7 after blocking the compensa tionswsinde 23 by the weight 21 under tension and unwound. Regardless of the current position of platform 1 in the sea, the command “click into place” 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 point of the rope.
  • 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.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Jib Cranes (AREA)
  • Earth Drilling (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Revetment (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Heben und Senken einer schwimmfähigen Offshore-Piattform, die mit relativ zu ihr bewegbaren Stützbeinen versehen ist, die im Betriebszustand auf dem Meeresboden oder auf einer auf den Meeresboden abgesenkten Unterkonstruktion abgestützt sind, wobei die Hubeinrichtung jeweils dann entgegen einer abwärts gerichteten Bewegung blockiert ist, wenn bei aufgesetzten Stützbeinen und schwimmender Plattform sich diese an dem höchsten Punkt der Wellenbewegung befindet.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, in the operating state, are supported on the seabed or on a substructure lowered to the seabed, the lifting device then in each case counter to a downward direction directional movement is blocked when the support legs and the floating platform are at the highest point of the wave movement.

Eine solche Vorrichtung ist aus der US-A-4 002 038 bekannt. Mit dieser Vorrichtung wird das Absetzen der Stützbeine auf die Unterkonstruktion erleichtert. Dieses Absetzen ist immer eine kritische Operation, da die mit den Wellen auf-und abschwingende Plattform bei ungünstigen Seeverhältnissen mehrfach mit den ausfahrenden Stützbeinen auf die Unterkonstruktion aufstoßen kann, er sie endgültig feststeht. Bei der bekannten Vorrichtung ist dafür gesorgt, daß die aufschwimmende Plattform, wenn sie gerade den höchsten Punkt erreicht hat, in dieser Stellung einrastet und nicht weider mit der abfallenden Welle absinkt.Such a device is known from US-A-4 002 038. This device makes it easier to place the support legs on the substructure. This setting down is always a critical operation, since the platform that swings up and down with the waves can hit the substructure several times with the extending support legs in unfavorable sea conditions, so it is finally fixed. In the known device it is ensured that the floating platform, when it has just reached the highest point, engages in this position and does not sink further with the falling wave.

Bei der aus der US-A-4 002 038 bekannten Vorrichtung ist für das Anheben der Plattform ein hydraulisches Hubsystem verwendet, das mit zwei wechselweise an das Stützbein angreifenden Haltesystemen zusammenwirkt. Das Festklemmen der Plattform im höchsten Punkt der Wellenbewegung wird durch schwenkbare und einrastende Klinken erreicht. Über ein derartiges Hubsystem können nicht so schwere Plattform gehoben werden, wie das mit Hilfe von an sich bekannten Seilwinden der Fall wäre.In the device known from US-A-4 002 038, a hydraulic lifting system is used for lifting the platform, which cooperates with two holding systems which alternately act on the support leg. The platform is clamped at the highest point of the wave movement by means of pivoting and latching pawls. Such a lifting system cannot lift such a heavy platform as would be the case with the aid of cable winches known per se.

Der Erfindung liegt die Aufgabe zugrunde, ein Seilsystem für das Heben und Senken einer schwimmfähigen Plattform zu schaffen, mit dem es möglich ist, die Plattform in einer solchen Weise zu heben, daß die schwimmende Plattform bei aufgesetzten Stützbeinen im höchsten Punk einer Wellenbewegung festgehalten werden kann.The invention has for its object to provide a rope system for lifting and lowering a buoyant platform, with which it is possible to raise the platform in such a way that the floating platform can be held in place at the highest point of a wave motion when the support legs are attached .

Diese Aufgabe wird erfindungsgemaß dadurch gelöst, daß zwei als Seilwinden ausgebildete Hubvorrichtingen vorgesehen sind, und daß bei aufgesetzten Stützbeinen und schwimmender Plattform der Antrieb der einen Seilwinde ausgeschaltet ist und die andere Seilwinde in Aufwickelrichtung freigegeben und in Abwickelrichtung blockierbar ist.This object is achieved according to the invention in that two lifting devices designed as cable winches are provided, and in that when the support legs and floating platform are attached, the drive of one cable winch is switched off and the other cable winch is released in the winding direction and can be blocked in the winding direction.

Weitere vorteilhalfte Ausgestaltungen der Erfindung sind in den Unteransprüchen wiedergegeben.Further advantageous embodiments of the invention are given in the subclaims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen :

  • Figur 1 schematisch die Seitenansicht einer Offshore-Plattform mit einer Hubeinrichtung gemäß der Erfindung
  • Figur 2 die Seitenansicht einer Hubeinrichtung
  • Figur 3 die Draufsicht zu Figur 2
  • Figur 4 den Längsschnitt durch die Seiltrommel einer Hubvorrichtung
  • Figur 5 das Schaltschema einer Rastensperre.
An embodiment of the invention is shown in the drawing and is explained in more detail below. Show it :
  • Figure 1 schematically shows the side view of an offshore platform with a lifting device according to the invention
  • Figure 2 shows the side view of a lifting device
  • 3 shows the top view of FIG. 2
  • Figure 4 shows the longitudinal section through the cable drum of a lifting device
  • Figure 5 shows the circuit diagram of a latch lock.

Die schwimmfähig ausgebildete Plattform 1 weist einen rechteckigen oder quadratischen Querschnitt auf und ist mit vier relativ zu ihr bewegbaren und hebund senkbaren Stützbeinen 2 versehen. Diese Plattform 1 wird mit hochgezogenen Stützbeinen 2 über den Errichtungsort auf See geschleppt. Nach dem Erreichen der vorgesehenen Position werden die Stützbeine 2 mit Hilfe der nachfolgend beschriebenen Hubvorrichtung abgesenkt, bis sie auf dem Meeresboden oder auf einer auf den Meeresboden abgesenkten Unterkonstruktion aufsitzen. Anschließend wird die Plattform 1 bis auf die gewünschte Höhe oberhalb des Meesresspiegels angehoben. Im Betriebzustand sind die Stützbeine 2 der Plattform direkt oder indirekt auf dem Meeresboden abgestützt.The buoyant platform 1 has a rectangular or square cross section and is provided with four support legs 2 which can be moved and raised relative to it. This platform 1 is towed with the support legs 2 raised 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 the sea level. In the operating state, the support legs 2 of the platform are supported directly or indirectly on the sea floor.

Die Hubeinrichtung besteht aus zwei einseitig wirkenden Hubvorrichtungen in Form von Seilwinden 3 und 4, die unabhängig voneinander antreibbar sind. Die beiden Seilwinden 3 und 4 sind auf einem gemeinsamen Grundrahmen 17 auf der Plattform 1 angeordnet. In der Figur 1 sind die beiden Seilwinden 3 und 4 zum leichteren Verständnis um 90° versetzt dargestellt. Jedes der vier Stützbeine 2 ist mit mindestens einer solchen Einrichtung versehen.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 ° for easier understanding. Each of the four support legs 2 is provided with at least one such device.

Die erste Seilwinde 3 dient zum Senken und Heben des Stützbeines 2 und arbeitet vorzugsweise an einem einfachen Seilstrang. Das Seil 5 ist über eine auf der Plattform 1 angeordneten Umlenkrolle 6 zu dem Befestigungspunkt am Fuß des Stützbeines 2 geführt.The first winch 3 is used to lower and raise the support leg 2 and preferably works on a simple rope strand. The rope 5 is guided over a deflection roller 6 arranged on the platform 1 to the fastening point at the foot of the support leg 2.

Die zweite Seilwinde 4 dient zum Heben und Senken der Plattform 1 und arbeitet an einem vielfachen Seilstrang. Das Hubseil 7 ist zur Lasteinleitung auf das Stützbein 2 über einen oberen Rollenbock 8 geführt, der auf einem Joch 9 des Stützbeines 2 angeordnet ist. Der untere Rollenbock 10 mit dem Seilfestpunkt befindet sich unmittelbar vor der Seilwinde 4 auf der Plattform 1.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 10 with the fixed rope point is located directly in front of the winch 4 on the platform 1.

Der Antrieb der Seilwinden 3 und 4 erfolgt jeweils über ein Mitnehmerrastenrad 11, das mit der Seiltrommel 12 bzw. 13 verbunden ist. In die Rastzähne 14 des Mitnehmerrastenrades 11 greift der Kopf einer Kolbenstange 15 ein. Die Kolbenstange 15 ist in einem Hydraulikzylinker 16 geführt und mit einem beidseitig beaufschlagten Kolben verbunden. Der Hydraulikzylinder 16 ist schwenkbar an dem die Seilwinden 3 und 4 tragenden Grundrahmen 17 befestigt. Eine ebenfalls schwenkbar an dem Grundrahmen 17 angeordnete Zylinderanordnung 18 zieht den Kopf der Kolbenstange 15 in Eingriffsstellung bzw. drückt ihn in Leerlaufstellung. Um ein unerwünschtes Zurückdrehen des Mitnehmerrastenrades 11 bei außer Eingriffstellung der Kolbenstange 15 zu vermeiden, ist eine Rastsperre bestehend aus einer Schwenklinke 19 und einem Klinkenzapfen 20 vorgesehen. Die Schwenkklinke 19 ist schwenkbar am Grundrahmen 17 angeordnet und wird ebenso wie die Kolbenstange 15 durch eine Zylinderanordnung 18 in Eingriffstellung gebracht.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. To an undesirable To avoid turning back the ratchet wheel 11 when the piston rod 15 is out of engagement, a detent consisting of a pivot 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.

Die erste Seilwinde 3 ist nach Figur 4 mit einer permanenten Seilspannvorrichtung versehen, die aus einem rückschlagarmen Freilauf und einem Antriebsmotor 30 besteht. Der Freilauf ist im vorliegenden Fall als Klemmkörperfreilauf ausgebildet, dessen Klemmkörper 39 zwischen dem Mitnehmerrastenrad 11 und der Seiltrommel 12 angeordnet sind. Der Antriebsmotor 30 ist an den Grundrahmen 17 angeflanscht und treibt ein Ritzel 31 an, das mit einem an der Seiltrommel 12 befestigten Zahnkranz 32 in Eingriff steht. Der Antriebsmotor 30 übt auf die Seiltrommel 12 in Aufwickerlrichtung des Seiles 5 ein Drehmoment aus.According to FIG. 4, 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. In the present case, 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.

Die zweite Seilwinde 4 ist ebenfalls mit einer Schlaffseilsicherung versehen. Diese besteht aus einem duch ein Gewicht 21 belastetes Seil 22, das entgegen der Wickelrichtung des Hubseiles 7 um die Seiltrommel 13 der zweiten Seilwinde 4 gewickelt ist. Das Gewicht 21 ist mit einer losen Rolle 33 verbunden. Das um die Seiltrommel 13 gewickelte Seil 22 ist über die Rolle 33 zu einer auf der Plattform 1 aufgestellten Kompensationswinde 23 geführt. Durch das Gewicht 21 in Verbindung mit der Kompensationswinde 23 wird an der Seiltrommel 13 ein Drehmoment erzeugt und hierdurch das Hubseil 7 aufgewickelt oder unter Vorspannung abgewickelt. Die Kompensationswinde 23 sorgt dafür, daß das Gewicht 21 stets in der gleichen Höhenlage gehalten ist. Bei blockierter Kompensationswinde 23 erzeugt allein das Gewicht 21 das Drehmoment, wobeies seine Höhenlage verändert.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, which changes its altitude.

Die Seiltrommel 13 der zweiten Seilwinde 4 besteht aus einem Hohlzylinder 24, der auf einer statisch beanspruchten Grundtrommel 26 gleitend geführt ist. Bei ausgerückter Kolbenstange 15 und ausgerückter Sperrklinke 19 wird der Hohlzylinder 24 dynamisch mit geringer Last beansprucht. Während des Hubvorganges bildet der Hohlzylinder 24 mit der Grundtrommel 25 eine Einheit. Durch die Aufteilung der Seiltrommel 13 in einen Hohlzylinder 24 von geringer Masse und in die Grundtrommel 25 wird das Massenträgheitsmoment der Massen klein gehalten, die bei im Freilauf geschalteter Seiltrommel 13 einer Beschleunigung unterworfen sind.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. When the piston rod 15 is disengaged and the pawl 19 is disengaged, the hollow cylinder 24 is stressed dynamically with a low load. During the lifting process, the hollow cylinder 24 forms a unit with the base drum 25. By dividing the cable drum 13 into a hollow cylinder 24 of low mass and into the base drum 25, the mass moment of inertia of the masses is kept small, which are subjected to acceleration when the cable drum 13 is freewheeling.

Die aus der Sperrklinke 19 und dem Klinkenzapfen 20 gebildete Rastsperre und die Hydraulikzylinder 16 des Antriebes der Seiltrommel 13 der zweiten Seilwinde sind mit einer hydraulischen Sicherheits-Rastsperre versehen, deren Schaltschema in Figur 5 dargestellt ist. So wird sichergestellt, daß die Kolbenstange 15 und die Sperrklinke 19 stets außer Eingriff sind, wenn sich die Plattform 1 abwärts bewegt. Im einzelnen besteht die Sperre aus einer Pumpe 34, die von der Seiltrommel 13 der zweiten Seilwinde 4 angetrieben ist und zwei Sperrzylinder 38. Die Pumpe 34 fördert nur bei einer Abwärtsbewegung der Plattform 1 entsprechenden Drehrichtung der Seiltrommel 13 ein Druckmittel über eine Hydraulikleitung 35 zu den oberen Kolbenräumen der Sperrzylinder 38. Bei einer Druckbeaufschlagung dieser Kolbenräume werden die Kolbenstange 15 und die Sperrklinke 19 zum Einrasten freigegeben. Außerdem ist aus Sicherheitsgründen in der Hydraulikleitung 35 ein Ventil 36 vorgesehen, das vor der Entsicherung aktiviert werden muß.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. This ensures that the piston rod 15 and the pawl 19 are always disengaged when the platform 1 moves downward. Specifically, 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 upper piston spaces of the locking cylinder 38. When these piston spaces are pressurized, the piston rod 15 and the pawl 19 are released for engagement. In addition, for safety reasons, a valve 36 is provided in the hydraulic line 35, which must be activated before unlocking.

Um eine gleichmäßige Lastaufnahme der an den vier Stützbeinen 2 angreifenden Hubeinrichtungen zu erreichen, sind die Seilfespunkte des Hubseiles 7 mit kommunizierten Ausgleichzylindern 26 ausgerüstet. Diese Ausgleichszylinder 26 sind um eine waagerechte Achse schwenkbar in einer Lagergabel 27 gehalten, die mit der Plattform 1 verbunden sind. Innerhalb der Ausgleichszylinder 26 ist ein Kolben 28 mit einer Kolbenstange 29 geführt. Das Hubseil 7 ist an der Kolbenstange 29 angeschlagen.In order to achieve a uniform load absorption of the lifting devices acting on the four support legs 2, the rope fixed 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.

Die erfindungsmäße Vorrichtung arbeitet auf folgende Weise. Wenn die Plattform 1 die vorgesehene Position auf See erreicht hat, wird von einem zentralen Steuerstand aus der Senkvorgang der Stützbeine 2 eingeleitet. Dabei ist der Antrieb der ersten Seilwinde 3 in Eingriff, während der Kopf der Kolbenstange 15 und die Schwenkklinke 19 der zweiten Seilwinde 4 ausgerückt sind. Mit Hilfe der esten Seilwinde 3 werden alle vier Stützbeine 2 synchron schrittweise abgesenkt.The device according to the invention works in the following way. When the platform 1 has reached the intended position at sea, the lowering of the support legs 2 is initiated from a central control station. The drive of the first winch 3 is engaged, while the head of the piston rod 15 and the pawl 19 of the second winch 4 are disengaged. With the help of the first winch 3, all four support legs 2 are gradually lowered synchronously.

Während des Absenkens der Stützbeine 2 führt die schwimmende Plattform 1 Oszillationen im Seegang aus. Berührt, wenn sich die Plattform 1 in einem Wellental befindet, ein Stützbein 2 den Meeresboden oder eine auf den Meersboden abgesetze Unterkonstruktion, reduziert sich der Hydraulikdruck in dem Hydraulikzylinder 16 der ersten Seilwinde 3. Haben alle Hydraulikzylinder eine Druckreduzierung erfahren, wird noch ein Senkschritt gefahren.During the lowering of the support legs 2, 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 .

Bei der darauffolgenden Druckreduzierung werden die Kolbenstange 15 und die Sperrklinke 19 der ersten Seilwinde 3 durch die Zylinderanordnungen 18 außer Eingriff gebracht und die erste Seilwinde 3 dadurch in den Leerlauf geschaltet. Damit haben die Stützbeine 2 aufgesetzt. Die Leerlaufstellung der esten Seilwinde 3 ist dadurch charakterisiert, daß die Plattform 1 alle Bewegungen im Seegang ausführen kann, ohne daß eine Verbindung zwischen der Plattform 1 und den Stützbeinen 2, abgesehen von Reibung, besteht. Während des Absenkvorganges verkürzt sich der Abstand zwischen dem oberen Rollenbock 8 und dem unteren Rollenbock 10. Das hierbei anfallende Hubseil wird mit Hilfe des Gewichtes 21 und oder Kompensationswinde 23 aufgespult.In the subsequent pressure reduction, 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 perform all movements in rough seas without a connection between the platform 1 and the support legs 2, apart from friction. During the lowering process, the distance between the upper roller block 8 and the lower roller block 10 is shortened.

Die Plattform 1 bewegt sich nach dem Aufsetzen der Stützbeine 2 im Seegang, wobei das Hubseil 7 nach einem Blockieren der Kompensationswsinde 23 durch das Gewicht 21 unter Vorspannung auf- und abgespult wird. Unabhängig von der augenblicklichen Lage der Plattform 1 im Seegang wird über eine Steuerung das Kommando « einrasten gegeben. Dadurch wird bewirkt, daß, sobald sich die Plattform 1 in der Aufwärtsbewegung befindet, die Kolbenstange 15 und die Sperrklinke 19 der zweiten Seilwinde 4 selbsttätig eingerückt werden. Hierdurch wird die Seiltrommel 13 der zweiten Seilwinde 4 gehindert, sich entgegen der Hubrichtung bereits in Abwärtsrichtung der Plattform 1 zu drehen. Auf diese Weise wird die Plattform 1 in der obersten Seegangstellung eingehängt und ist dadurch mit den Stützbeinen 2 verbunden. Wird die Plattform 1 durch eine nachfolgende höhere Welle noch weiter angehoben, dann wird sie in der neuen obersten Position selbstständig eingehängt.The platform 1 moves after putting on the support legs 2 in the sea, the lifting rope 7 after blocking the compensa tionswsinde 23 by the weight 21 under tension and unwound. Regardless of the current position of platform 1 in the sea, the command “click into place” 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.

Sind nach dem Einhängen der Plattform 1 die Kolbenstange 15 und die Schwenkklinke 19 eingerückt, beginnt sofort der schrittweise Hubvorgang der Plattform 1. Sämtliche Seilwinden 4 arbeiten synchron und heben die Plattform horizontal an. Unterschiedliche Hublängen einer Seilwinde 4 zum Beispiel beim Wechseln in eine andere Seillage, werden durch die Ausgleichzylinder 26 am Seifestpunkt kompensiert.If the piston rod 15 and the swivel pawl 19 are engaged after the platform 1 has been hooked in, 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 point of the rope.

Soll nach einer Verweildauer von etwa 8 bis 10 Jahren die Plattform verfahren werden, so wird die Plattform nach dem grundsätzlichen gleichen Schema abgesenkt, wobei die gleichen Vorgänge in entgegengesetzter Richtung ablaufen.If 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.

Claims (8)

1. Device for lifting and lowering a floating offshore plattform (1) which is provided with supporting legs (2) capable of moving relative to the platform which in operating condition rest on the seabed or a base structure landed on the seabed, the jack-up device being locked in each case against a downward movement when the platform (1) in floating condition and with the supporting legs (2) placed in position is at the highest point of the wave crest, characterized in that two jack-up devices designed as cable winches (3, 4) are provided and that with the supporting legs (2) emplaced on the seabed and the platform (1) floating the drive of one cable winch (3) is switched off and the other cable winch (4) is released in winding-up direction and lockable in winding-off direction.
2. Device according to Claim 1, characterized in that the cable drums (12, 13) of the cable winches (3, 4) are connected with a driver ratchet wheel (11) provided with ratchet teeth (14) in which the piston rod (15) of a swivelling hydraulic cylinder (16) and a pivoted pawl engage.
3. Device according to Claims 1 and 2, characterized in that the cable winch (3) whose cable (5) is connected with the lower end of one supporting leg (2) is coupled to a permanent cable tensioning device consisting of a low-coil free wheel which is arranged between the cable drum (12) and the driver ratchet wheel (11), and a drive motor (30) which exerts a torque on the cable drum (12) in the winding-up direction.
4. Device according to Claims 1 to 3, characterized in that the drive of the second cable winch (4) is provided with a safety catch consisting of two locking cylinders (38) to which hydraulic fluid is admitted via a pump (34) which is driven by the cable drum (13) and produces pressure only during the upward movement of the platform (1).
5. Device according to Claims 1 to 4, characterized in that the ends of the lifting cables (7) are fixed to piston rods (29) which are guided in compensating cylinders (26) connected with the platform (1).
6. Device according to Claim 1 to 5, characterized in that the cable winch (4) is equipped with a slack cable safety device which has a cable (22) loaded by a weight (21) which is run around the cable drum (13) of the cable winch (4) counter to the winding direction of lifting cable (7).
7. Device according to Claim 6, characterized in that the drum (13) of the second cable winch (4) consists of a hollow cylinder (24) which is arranged to slide on a base drum (25).
8. Device according to Claims 6 and 7, characterized in that the weight (21) is connected with a pulley (33) around which the cable (22) is run to a compensating winch (23).
EP81100301A 1980-03-06 1981-01-16 Device for raising and lowering a floatable offshore platform Expired EP0035629B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3008585 1980-03-06
DE19803008585 DE3008585A1 (en) 1980-03-06 1980-03-06 DEVICE FOR LIFTING AND LOWERING A FLOATING OFFSHORE PLATFORM

Publications (3)

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

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EP81100301A Expired EP0035629B1 (en) 1980-03-06 1981-01-16 Device for raising and lowering a floatable offshore platform

Country Status (7)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234177C2 (en) * 1982-09-15 1985-12-05 Dyckerhoff & Widmann AG, 8000 München Method for lowering a platform of an artificial island on a supporting structure and device for carrying out the method
JPS60195324U (en) * 1984-05-31 1985-12-26 株式会社　カノボ−リング spat barge
JPS62211216A (en) * 1986-03-08 1987-09-17 Seidensha:Goushi Lifting gear for conveying pallet in conveyor system
JPH0736915Y2 (en) * 1987-03-25 1995-08-23 株式会社三隆製作 Transfer container transfer mechanism
JPH0256321A (en) * 1988-08-23 1990-02-26 Matsushita Electric Works Ltd Conveyance device
JP2507950Y2 (en) * 1992-09-04 1996-08-21 碧南特殊機械株式会社 Receiving type pitch feed conveyor for ceramic products

Citations (1)

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Publication number Priority date Publication date Assignee Title
US4002038A (en) * 1975-10-06 1977-01-11 Raymond International Inc. Method and apparatus for rapid erection of offshore towers

Family Cites Families (5)

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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 (en) * 1965-01-08 1974-07-15 Gusto Fa Nv DRILLING ISLAND OR SIMILAR 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 (en) * 1974-07-30 1976-02-03 Willem Josef George Strolenber DEVICE FOR LIFTING OR LOWERING A LOAD.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002038A (en) * 1975-10-06 1977-01-11 Raymond International Inc. Method and apparatus for rapid erection of offshore towers

Also Published As

Publication number Publication date
BR8101379A (en) 1981-09-08
MX152501A (en) 1985-08-14
EP0035629A3 (en) 1982-03-03
NO154277C (en) 1986-08-20
JPS57210A (en) 1982-01-05
NO810137L (en) 1981-09-07
EP0035629A2 (en) 1981-09-16
DE3008585A1 (en) 1981-09-17
CA1155307A (en) 1983-10-18
NO154277B (en) 1986-05-12

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