NL2019115B1 - Seafastening of a cantilever on a mobile offshore platform - Google Patents

Seafastening of a cantilever on a mobile offshore platform Download PDF

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Publication number
NL2019115B1
NL2019115B1 NL2019115A NL2019115A NL2019115B1 NL 2019115 B1 NL2019115 B1 NL 2019115B1 NL 2019115 A NL2019115 A NL 2019115A NL 2019115 A NL2019115 A NL 2019115A NL 2019115 B1 NL2019115 B1 NL 2019115B1
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Netherlands
Prior art keywords
cantilever
platform
distal
retaining
marine
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Application number
NL2019115A
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Dutch (nl)
Inventor
Verdouw Cornelus
Alexander Van Rossum René
De Bruijn René
Francesco Morello Vincenzo
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Gustomsc Resources Bv
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Priority to NL2019115A priority Critical patent/NL2019115B1/en
Application granted granted Critical
Publication of NL2019115B1 publication Critical patent/NL2019115B1/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B17/00Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02Artificial 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
    • E02B17/021Artificial 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00Supports for the drilling machine, e.g. derricks or masts
    • E21B15/003Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00Supports for the drilling machine, e.g. derricks or masts
    • E21B15/02Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling

Abstract

A mobile offshore platform has a cantilever movable between an extended position and a retracted position and a movement system With a first guide mounted to the cantilever and oriented parallel to the cantilever, a second guide mounted to the platform hull and oriented transverse to the cantilever and at least one support runner for guided movement along the first and second guides. A proximal seafastening arrangement is provided for retaining the retracted cantilever in position relative to the platform hull. A distal seafastening arrangement is provided for retaining the retracted cantilever in position relative to the platform hull. When in seafastened condition, a first retaining portion of the distal seafastening arrangement and a second retaining portion of the distal seafastening arrangement at the platform hull are mutually engaged in a position under the cantilever. A method for seafastening a cantilever of a platform is also described.

Description

Figure NL2019115B1_D0001
Octrooicentrum Nederland © 2019115 (2?) Aanvraagnummer: 2019115 © Aanvraag ingediend: 23 juni 2017 © B1 OCTROOI Netherlands Patent Office © 2019115 (2?) Application number: 2019115 © Application filed: 23 June 2017 © B1 PATENT
Int. Cl.: Int. Cl .:
E02B 17/02 (2017.01) E21B 15/02 (2018.01) E02B 17/02 (2017.01) E21B 15/02 (2018.01)
0 Aanvraag ingeschreven: 0 Application registered: © Octrooihouder(s): © Patent holder (s):
7 januari 2019 January 7, 2019 GustoMSC Resources BV te Schiedam. GustoMSC Resources BV in Schiedam.
0 Aanvraag gepubliceerd: 0 Request published:
- - © Uitvinder(s): © Inventor (s):
Cornelus Verdouw te Schiedam. Cornelus Verdouw in Schiedam.
© Octrooi verleend: © Patent granted: René Alexander van Rossum te Schiedam. René Alexander van Rossum in Schiedam.
7 januari 2019 January 7, 2019 René de Bruijn te Schiedam. René de Bruijn in Schiedam.
Vincenzo Francesco Morello te Schiedam. Vincenzo Francesco Morello in Schiedam.
© Octrooischrift uitgegeven: © Patent issued:
6 mei 2019 May 6, 2019
© Gemachtigde: © Authorized representative:
ir. CM Jansen cs te Den Haag. ir. CM Jansen et al. In The Hague.
54) Seafastening of a cantilever on a mobile offshore platform 54) Seafastening or a cantilever on a mobile offshore platform
A mobile offshore platform has a cantilever movable between an extended position and a retracted position and a movement system with a first guide mounted to the cantilever and oriented parallel to the cantilever, a second guide mounted to the platform hull and oriented transverse to the cantilever and at least one support runner for guided movement along the first and second guides. A proximal seafastening arrangement is provided for retaining the retracted cantilever in position relative to the platform hull. A distal seafastening arrangement is provided for retaining the retracted cantilever in position relative to the platform hull. When in seafastened condition, a first retaining portion of the distal seafastening arrangement and a second retaining portion of the distal seafastening arrangement at the platform hull are mutually engaged in a position under the cantilever. A method for seafastening a cantilever of a platform is also described.A mobile offshore platform has a cantilever movable between an extended position and a retracted position and a movement system with a first guide mounted to the cantilever and oriented parallel to the cantilever, a second guide mounted to the platform hull and oriented transverse to the cantilever and at least one support runner for guided movement along the first and second guides. A proximal seafastening arrangement is provided for retaining the retracted cantilever in position relative to the platform hull. A distal seafastening arrangement is provided for retaining the retracted cantilever in position relative to the platform hull. When in seafastened condition, a first retaining portion of the distal seafastening arrangement and a second retaining portion of the distal seafastening arrangement on the platform hull are mutually engaged in a position under the cantilever. A method for seafastening a cantilever or a platform is also described.
NL B1 2019115 NL B1 2019115
Dit octrooi is verleend ongeacht het bijgevoegde resultaat van het onderzoek naar de stand van de techniek en schriftelijke opinie. Het octrooischrift komt overeen met de oorspronkelijk ingediende stukken. This patent has been granted regardless of the attached result of the research into the state of the art and written opinion. The patent corresponds to the documents originally submitted.
P115130NL00 P115130NL00
TITLE: Seafastening of a cantilever on a mobile offshore platform TITLE: Seafastening or a cantilever on a mobile offshore platform
FIELD AND BACKGROUND OF THE INVENTIONFIELD AND BACKGROUND OF THE INVENTION
The invention relates to a mobile offshore platform transformable between a floating condition for displacement between operating locations and a stationary condition supported by the sea bottom. An example of such a mobile offshore platform is a jack-up rig, which has a self-elevating hull that can be jacked up to its stationary operating position above the sea using legs that are first lowered to the sea bottom and along which the hull of the rig is subsequently jacked-up. For displacement to a new operating position, the platform hull is lowered until it floats and subsequently the legs are raised as much as possible to reduce drag when a tugboat tows the rig or the rig is propelled by its own drive.The invention relates to a mobile offshore platform transformable between a floating condition for displacement between operating locations and a stationary condition supported by the sea bottom. An example of such a mobile offshore platform is a jack-up rig, which has a self-elevating hull that can be jacked up to its stationary operating position above the sea using legs that are first lowered to the sea bottom and along which the hull or the rig is subsequently jacked-up. For displacement to a new operating position, the platform hull is lowered until it floats and subsequently the legs are raised as much as possible to reduce when a tugboat tows the rig or the rig is propelled by its own drive.
In floating condition, a mobile offshore platform is a vessel and accordingly moves as a result of being exposed to waves and swell of the sea surface, while, in stationary condition, the platform legs rest on the sea bottom so that the platform moves very little.In floating condition, a mobile offshore platform, a vessel and corresponding moves as a result of being exposed to waves and swell of the sea surface, while, in stationary condition, the platform legs rest on the sea bottom so that the platform moves very little .
Such mobile offshore platforms can for example be used to drill for hydrocarbons or to install offshore structures. For drilling operations a drill floor and drilling derrick are usually placed on the aft (distal) end of a cantilever structure. The complete cantilever can be moved relative to the platform hull of the mobile offshore platform with an X-Y movement system to allow precise placement of the drilling derrick above drilling locations in a large area to the rear of the platform hull without displacement of the rig which would require lowering and jacking up of the platform hull. Mobile offshore platforms having a movement system allowing extension and retraction in longitudinal (X) direction of the cantilever and pivoting of the cantilever about a vertical axis are also known.Such mobile offshore platforms can be used for example to drill for hydrocarbons or to install offshore structures. For drilling operations a drill floor and drilling derrick are usually placed on the aft (distal) end of a cantilever structure. The complete cantilever can be moved relative to the platform hull of the mobile offshore platform with an XY movement system to allow precise placement of the drilling derrick above drilling locations in a large area to the rear of the platform hull without displacement of the rig which would require lowering and jacking up the platform hull. Mobile offshore platforms having a movement system allowing extension and retraction in longitudinal (X) direction of the cantilever and pivoting of the cantilever about a vertical axis are also known.
An example of such a mobile offshore platform with such a movement system is describedin US 6 171 027. Longitudinal rails oriented in a direction designated as the X-direction are attached to the cantilever, and transverse rails oriented in a direction designated as the Y-direction perpendicular to the X-direction are attached to an upwardly facing side (usually the main deck) of the platform hull.An example of such a mobile offshore platform with such a movement system is described in US 6 171 027. Longitudinal rails oriented in a direction designated as the X-direction are attached to the cantilever, and transverse rails oriented in a direction designated as the Y- direction perpendicular to the X-direction are attached to an upwardly facing side (usually the main deck) or the platform hull.
Supporting members between the cantilever and the platform deck, for supporting the cantilever relative to the platform deck, are provided in the form of support runners and guided for movement over the rails in Y direction, while the cantilever is supported and guided by the support runners for movement in the X direction as the rails in X direction of the cantilever move over the support runners. The support runners may slide over the rails or have rollers rolling over the rails. The movement system drive may for instance be of a hydraulic cylinder or of a rack-and-pinion type. The support runners also constitute spacers causing the level of the cantilever above the main deck to be relatively high, so that more vertical space above the main deck is available for other items and the height to which the platform hull has to be lifted for work over an existing jacket is reduced.Supporting members between the cantilever and the platform deck, for supporting the cantilever relative to the platform deck, are provided in the form of support runners and guided for movement over the rails in Y direction, while the cantilever is supported and guided by the support runners for movement in the X direction as the rails in X direction or the cantilever move over the support runners. The support runners may slide over the rails or have rollers rolling over the rails. The movement system drive may be for a hydraulic cylinder or rack-and-pinion type. The support runners also note spacers causing the level of the cantilever above the main deck to be relatively high, so that more vertical space above the main deck is available for other items and the height to which the platform hull has to be lifted for work over an existing jacket is reduced.
When the rig is to be brought into a floating condition, the cantilever is retracted and has to be seafastened to prevent the cantilever from moving relative to the platform hull due to motion of the floating hull in waves and swell (pitch, roll and yaw). At the forward (proximal) end, the retracted cantilever is restrained against movement relative to the platform hull in both longitudinal and transverse directions by pins extending through holes in front end portions of each of the two longitudinal cantilever rails and in a support structure on the platform hull. By holding the corresponding ones of the holes in the rails and in the support structure in mutual alignment, the front end of the cantilever is held in position in both X and Y directions.When the rig is brought into a floating condition, the cantilever is retracted and has to be seafastened to prevent the cantilever from moving relative to the platform hull due to motion or the floating hull in waves and swell (pitch, roll and yaw) . At the forward (proximal) end, the retracted cantilever is restrained against movement relative to the platform hull in both longitudinal and transverse directions by pins extending through holes in front end portions or each of the two longitudinal cantilever rails and in a support structure on the platform hull. By holding the corresponding ones of the holes in the rails and in the support structure in mutual alignment, the front end of the cantilever is hero in position in both X and Y directions.
In addition to seafastening at the front end of the cantilever, also the aft (distal) end of the cantilever has to be seafastened to avoid pivoting of the cantilever about its front end, which would result in damage to the attachment of the front end. A known solution for seafastening of the aft end of the cantilever is to arrange a pillar bridging the vertical spacing between the cantilever and the main deck and extending from a pad eye at lower deck level at the aft end of the cantilever to an anchoring point located at one of the ends of the aft transverse deck rail.In addition to seafastening at the front end of the cantilever, also the aft (distal) end of the cantilever has to be seafastened to avoid pivoting or the cantilever about its front end, which would result in damage to the attachment or the front end. A known solution for seafastening of the end of the cantilever is to arrange a pillar bridging the vertical spacing between the cantilever and the main deck and extending from a pad eye at lower deck level at the end of the cantilever to anchoring point located at one of the ends of the aft transverse deck rail.
Due to its size and weight, handling during installation and removal of such a pillar is difficult and time consuming. When not in use as seafastening of the cantilever, it can be removed, causing dropped and swaying object hazards, or it can remain attached to the cantilever, which negatively affects the allowable remaining maximum cantilever load. Due to its size and weight, handling during installation and removal or such a pillar is difficult and time consuming. When not in use as seafastening or the cantilever, it can be removed, causing dropped and swaying object hazards, or it can remain attached to the cantilever, which negatively affects the allowable remaining maximum cantilever load.
SUMMARY OF THE INVENTION SUMMARY OF THE INVENTION
It is an object of the present invention to provide a solution for seafastening of a cantilever of a mobile offshore platform, of which easy handling during installation and removal is more easy, avoids risks of dropped or swaying objects, has less impact on allowable cantilever load when left in place and allows realization of a fully remotely controlled or automatic cantilever seafastening in a simple manner.It is an object of the present invention to provide a solution for seafastening or a cantilever or a mobile offshore platform, or which easy handling during installation and removal is more easy, avoids risks or dropped or swaying objects, has less impact on allowable cantilever load when left in place and allows realization of a fully remotely controlled or automatic cantilever seafastening in a simple manner.
According to the invention, this object is achieved by providing a mobile offshore platform according to claim 1. In another embodiment, this object is achieved by carrying out a seafastening method according to claim 16.According to the invention, this object has been achieved by providing a mobile offshore platform according to claim 1. In another embodiment, this object has been achieved by carrying out a seafastening method according to claim 16.
Because, in seafastened condition, a first retaining portion of the distal seafastening arrangement and a second retaining portion of the distal seafastening arrangement that is fixed to the platform hull in a position under the cantilever are mutually engaged, the seafastening arrangement can be very compact and easy to handle and operate.Because, in seafastened condition, a first retaining portion of the distal seafastening arrangement and a second retaining portion of the distal seafastening arrangement that is fixed to the platform hull in a position under the cantilever are mutually engaged, the seafastening arrangement can be very compact and easy to handle and operate.
Particular elaborations and embodiments of the invention are set forth in the dependent claims. Particular elaborations and the invention are set forth in the dependent claims.
Further features, effects and details of the invention appear from the detailed description and the drawings. Further features, effects and details of the invention appear from the detailed description and the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS LETTER DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic side view of an example of a platform according to the invention standing on the bottom of the sea with a cantilever in a partially extended position; FIG. 1 is a schematic side view of an example of a platform according to the invention standing on the bottom of the sea with a cantilever in a partially extended position;
Fig. 2 is a schematic top plan view of the platform according to Fig. 1 with the cantilever in a fully extended position; FIG. 2 is a schematic top plan view of the platform according to FIG. 1 with the cantilever in a fully extended position;
Fig. 3 is a schematic side view of a portion of the platform according to Figs. 1 and 2 including a cantilever in a fully retracted condition and a portion of a platform hull; FIG. 3 is a schematic side view or a portion of the platform according to Figs. 1 and 2 including a cantilever in a fully retracted condition and a portion of a platform hull;
Fig. 4 is a schematic top plan view of the platform according to Figs. 1-3 with the cantilever in a fully retracted position; FIG. 4 is a schematic top plan view of the platform according to Figs. 1-3 with the cantilever in a fully retracted position;
Fig. 5 is a schematic top plan view of a portion of a lower deck of the cantilever at a distal end of a cantilever of a platform according to Figs. 1-4; FIG. 5 is a schematic top plan view of a portion or a lower deck of the cantilever at a distal end or a cantilever or a platform according to Figs. 1-4;
Fig. 6 is a schematic side view in cross-section along a plane VI-VI in Fig. 5; FIG. 6 is a schematic side view in cross-section along a plane VI-VI in FIG. 5;
Fig. 7 is a top plan view of a portion of a transverse rail of a platform according to Figs. 1-6. FIG. 7 is a top plan view or a portion or a transverse rail or a platform according to Figs. 1-6.
Fig. 8 is a schematic side view in cross-section along a plane VIII-VIII in Fig. 7; FIG. 8 is a schematic side view in cross-section along a plane VIII-VIII in FIG. 7;
Fig. 9 is a schematic side view in cross-section along a plane IX-IX in Fig. 7; and FIG. 9 is a schematic side view in cross-section along a plane IX-IX in FIG. 7; and
Fig. 10 is a schematic side view in cross-section along a plane XX in FIG. 10 is a schematic side view in cross-section along a plane XX in
Fig. 4. FIG. 4.
DETAILED DESCRIPTION DETAILED DESCRIPTION
In the drawings, an example of a mobile offshore platform 1 according to the invention is shown. The platform has a platform hull 2 allowing the platform to float and three legs 3 movably guided relative to the platform hull 2 for vertical movement, relative to the platform hull 2. For driving movement of the legs 3 between a lowered operating position as shown in Fig. 1, in which the platform hull 2 is jacked up from a floating level, and a transport position (not shown) in which a major portion of the legs 3 project above the floating platform hull 2, leg drives 4 are provided.In the drawings, an example of a mobile offshore platform 1 according to the invention is shown. The platform has a platform hull 2 allowing the platform to float and three legs 3 movably guided relative to the platform hull 2 for vertical movement, relative to the platform hull 2. For driving movement of the legs 3 between a lowered operating position as shown in FIG. 1, in which the platform hull 2 is jacked up from a floating level, and a transport position (not shown) in which a major portion of the legs 3 project above the floating platform hull 2, lay drives 4 are provided.
The platform 1 further has an elongate cantilever 5 movable in longitudinal directions X of the cantilever 5 between an extended position (Figs. 1, 2) and a retracted position (Figs. 3, 4, 6, 8, 9, 10). At a distal end 7 of the cantilever 5 a drilling derrick 6 (shown in Fig. 1 only, in other top plan views, only corners of the derrick are shown) is mounted onto the cantilever 5. Depending on the operation to be carried out, other equipment may be provided at the distal end 7 of the cantilever 5. A moon pool deck 8 of the cantilever 5 is located at a lower level than other parts of the cantilever 5. In this example, the distal end 7 of the cantilever 5 constitutes the aft end of the cantilever 5, since the cantilever 5 projects to the rear of the platform hull 2 when in extended condition. If the cantilever projects forwardly or at a side of the platform hull, the distal end of the cantilever may also constitute a front or, respectively, lateral end of the cantilever.The platform 1 has an elongated cantilever 5 movable in longitudinal directions X of the cantilever 5 between an extended position (Figs. 1, 2) and a retracted position (Figs. 3, 4, 6, 8, 9, 10). At a distal end 7 of the cantilever 5 a drilling derrick 6 (shown in Fig. 1 only, in other top plan views, only corners of the derrick are shown) is mounted onto the cantilever 5. Depending on the operation to be carried out , other equipment may be provided at the distal end 7 of the cantilever 5. A moon pool deck 8 of the cantilever 5 is located at a lower level than other parts of the cantilever 5. In this example, the distal end 7 of the cantilever 5 includes the aft end of the cantilever 5, since the cantilever 5 projects to the rear of the platform hull 2 when in extended condition. If the cantilever projects forward or at a side of the platform hull, the distal end of the cantilever may also be a front or lateral end of the cantilever.
For displacing the cantilever 5 relative to the platform hull 2 in longitudinal directions X and in transverse directions Y, a movement system is provided. In this example, the movement system is a skidding system. The skidding system is formed by a first guide 9 mounted to the cantilever 5 and oriented in directions X parallel to the cantilever 5 for guiding movement of the cantilever 5 in the longitudinal directions X, a second guide 10 mounted to the platform hull 2 and oriented in directions Y transverse to the cantilever 5 ancl the longitudinal directions X for guiding movement of the cantilever 5 in the directions Y transverse to the cantilever 5, and support members in the form of support runners 11, 12, 13, 14 each arranged for guided movement along the first guide 9 and the second guide 10. When skidding the cantilever 5 in transverse directions Y, the support runners 11-14 run along the second guide 10. When skidding the cantilever 5 in longitudinal directions X, the first guide 9 runs over the support runners 11-14.For displacing the cantilever 5 relative to the platform hull 2 in longitudinal directions X and in transverse directions Y, a movement system is provided. In this example, the movement system is a skidding system. The skidding system is formed by a first guide 9 mounted to the cantilever 5 and oriented in directions X parallel to the cantilever 5 for guiding movement of the cantilever 5 in the longitudinal directions X, a second guide 10 mounted to the platform hull 2 and oriented in directions Y transverse to the cantilever 5 ancl the longitudinal directions X for guiding movement of the cantilever 5 in the directions Y transverse to the cantilever 5, and support members in the form of support runners 11, 12, 13, 14 each arranged for guided movement along the first guide 9 and the second guide 10. When skidding the cantilever 5 in transverse directions Y, the support runners 11-14 run along the second guide 10. When skidding the cantilever 5 in longitudinal directions X, the first guide 9 runs over the support runners 11-14.
When the platform 1 is in transit condition, with the platform hull 2 floating on a water surface, the cantilever 5 must be seafastened to the platform hull 2 to prevent it from moving relative to the platform hull 2 due to movements of the platform hull 2 caused by waves, swell and wind. For seafastening the cantilever 5 at its proximal (here forward) end 15, a proximal seafastening arrangement 16 is provided at a proximal end portion of the cantilever 5 for retaining the cantilever 5 in the retracted position in position relative to the platform hull 2. As is best seen in Fig. 10, in this example, the proximal seafastening arrangement 16 is formed by tongues 17 at a proximal end of the cantilever 5 and received in apertures 19 in a stand 18. The apertures 19 each have a lower boundary in the form of a guide and support plate 20 that is flared downwards in aft direction for guiding a chamfered front end 21 of the corresponding tongue 17 into the aperture 19 when the cantilever 5 approaches its retracted position, so that the skidding system is at least partially relieved of bending loads caused by the fact that most of the retracted cantilever 5 is located forwardly of the support runners 11-14. A pin 22 is inserted through aligned bores 23-26 in each of the tongues 17 and apertures 19 retaining the tongues 17 in their positions in the apertures 19. Thus, the proximal end of the retracted cantilever 5 is firmly held in position by the proximal seafastening arrangement 16 in seafastening condition. The skilled person will note that alternative solutions for sea fastening the proximal cantilever end may be provided, such as pins projecting into bores in forward end portions of the guide rails extending in longitudinal direction of the cantilever.When the platform 1 is in transit condition, with the platform hull 2 floating on a water surface, the cantilever 5 must be seafastened to the platform hull 2 to prevent it from moving relative to the platform hull 2 due to movements of the platform hull 2 caused by waves, swell and wind. For seafastening the cantilever 5 at its proximal end 15, a proximal seafastening arrangement 16 is provided at a proximal end portion of the cantilever 5 for retaining the cantilever 5 in the retracted position relative to the platform hull 2. As is best seen in FIG. 10, in this example, the proximal seafastening arrangement 16 is formed by tongues 17 at a proximal end of the cantilever 5 and received in apertures 19 in a position 18. The apertures 19 each have a lower boundary in the form of a guide and support plate 20 that is flared downwards in aft direction for guiding a chamfered front end 21 of the corresponding tongue 17 into the aperture 19 when the cantilever 5 approaches its retracted position, so that the skidding system is at least partially relieved or bending loads caused by the fact that most of the retracted cantilever 5 is located forwardly of the support runners 11-14. A pin 22 is inserted through aligned bores 23-26 in each of the tongues 17 and apertures 19 retaining the tongues 17 in their positions in the apertures 19. Thus, the proximal end of the retracted cantilever 5 is held hero in position by the proximal seafastening arrangement 16 in seafastening condition. The skilled person will note that alternative solutions for sea fastening the proximal cantilever end may be provided, such as pins projecting into bores in forward end portions of the guide rails extending in longitudinal direction or the cantilever.
Nevertheless, this is not sufficient for keeping the distal end 7 of the cantilever 5 from moving in transverse directions Y too far, in particular when the sea state is rough or high. Therefore, the platform 1 is also equipped with a distal seafastening arrangement 27 distally of the proximal seafastening arrangement 16 for retaining the cantilever 5 in the retracted position in position relative to the platform hull 2. When in seafastened condition, a first retaining portion 28 of the distal seafastening arrangement 27 engages a second retaining portion 29 of the distal seafastening arrangement 27 that is fixed to the platform hull 2, in a position under the cantilever 5. This allows the distal seafastening arrangement 27 to be very light and compact and easy to handle and operate during fastening and releasing of the cantilever 5. Therefore, it increases the workability, safety and capacity of the platform. Due to its small weight, the first retaining portion 28 of the distal seafastening arrangement 27 has very little effect on the allowable cantilever load. It is noted that embodiments in which the second retaining portion engages the first engaging portion or in which hot engaging portions engage each other are also conceivable.Nevertheless, this is not sufficient for keeping the distal end 7 or the cantilever 5 from moving in transverse directions Y too far, in particular when the sea state is rough or high. Therefore, the platform 1 is also equipped with a distal seafastening arrangement 27 distally of the proximal seafastening arrangement 16 for retaining the cantilever 5 in the retracted position in position relative to the platform hull 2. When in seafastened condition, a first retaining portion 28 of the distal seafastening arrangement 27 engages a second retaining portion 29 of the distal seafastening arrangement 27 that is fixed to the platform hull 2, in a position under the cantilever 5. This allows the distal seafastening arrangement 27 to be very light and compact and easy to handle and operate during fastening and releasing the cantilever 5. Therefore, it increases the workability, safety and capacity of the platform. Due to its small weight, the first retaining portion 28 of the distal seafastening arrangement 27 has very little effect on the allowable cantilever load. It is noted that in which the second retaining portion engages the first engaging portion or in which hot engaging portions engage each other are also conceivable.
The first retaining portion 28 of the distal seafastening arrangement 27 is mounted to the cantilever 5. Thus, the cantilever 5 is directly retained in position by the distal seafastening arrangement 27, which is more secure than if the distal end of the cantilever 5 would be retained in position in transverse directions Y via one or more of the support runners 11-14, which are not dimensioned for resisting sea fastening loads or would need to be dimensioned very heavily, in particular with regard to tilting loads that would have to be resisted and transferred via the guide structure.The first retaining portion 28 of the distal seafastening arrangement 27 is mounted to the cantilever 5. Thus, the cantilever 5 is directly retained in position by the distal seafastening arrangement 27, which is more secure than if the distal end of the cantilever 5 would be retained in position in transverse directions Y via one or more of the support runners 11-14, which are not dimensioned for resisting sea fastening loads or would need to be dimensioned very heavily, in particular with regard to tilting loads that would have been resisted and transferred via the guide structure.
Furthermore, a very secure seafastening of the distal end of the cantilever 5 is achieved, because the first retaining portion 28 of the distal seafastening arrangement 27 is mounted to a lower portion (in this example the moonpool deck 8) of the cantilever 5 projecting downwards relative to more proximal portions of the cantilever 5. In this position the distal seafastening arrangement 27 only needs to bridge a relatively small gap between the cantilever 5 and the platform hull 2.Furthermore, a very secure seafastening of the distal end of the cantilever 5 is achieved, because the first retaining portion 28 or the distal seafastening arrangement 27 is mounted to a lower portion (in this example the moonpool deck 8) or the cantilever 5 projecting downwards relative to more proximal portions of the cantilever 5. In this position the distal seafastening arrangement 27 only needs to bridge a relatively small gap between the cantilever 5 and the platform hull 2.
The gap to be bridged can be particularly small, because the first retaining portion 28 of the distal seafastening arrangement 27 is mounted in a position lower than the first guide 9. Nevertheless space is left for the support runners 11-14 because the first retaining portion 28 of the distal seafastening arrangement 27 is mounted in a position transverse of the support runners 13, 14 engaging the same rail of the second guide 9 in the transverse direction Y.The gap to be bridged can be particularly small, because the first retaining portion 28 of the distal seafastening arrangement 27 is mounted in a position lower than the first guide 9. Nevertheless space is left for the support runners 11-14 because the first retaining portion 28 of the distal seafastening arrangement 27 is mounted in a position transverse of the support runners 13, 14 engaging the same rail or the second guide 9 in the transverse direction Y.
The first guide 9 and also the second guide 10 are each constituted by a pair of rails 30, 31, 32, 33, which allows precise and stable guiding of the cantilever 5 during skidding.The first guide 9 and also the second guide 10 are each constituted by a pair of rails 30, 31, 32, 33, which allows precise and stable guiding of the cantilever 5 during skidding.
The distal seafastening arrangement 27 in fastening condition engages one of the rails 32, 33 of the second guide 10, in this example the one closest to a stern of the platform hull 2. Engaging the rail 32 closest to the outside of the platform 1 allows the cantilever 5 to be retained close to its distal end, which is advantageous for secure sea fastening. Furthermore, this avoids the need of passing a lowermost portion of the cantilever 5 that projects downwards until closely above the second guide 10 over a substantial portion of the platform hull 2 when retracting the cantilever 5 to its most retracted position.The distal seafastening arrangement 27 in fastening condition engages one of the rails 32, 33 of the second guide 10, in this example the one closest to a star of the platform hull 2. Engaging the rail 32 closest to the outside of the platform 1 allows the cantilever 5 to be retained close to its distal end, which is advantageous for secure sea fastening. Furthermore, this avoids the need of passing a lowermost portion of the cantilever 5 that projects downwards until closely above the second guide 10 over a substantial portion of the platform hull 2 when retracting the cantilever 5 to its most retracted position.
When the platform is afloat in rough seas, the cantilever 5 and the platform hull 2 tend to flex slightly. If, as in the present example, the cantilever 5 is fixed against movement relative to the platform hull 2 in longitudinal directions X at its proximal end 15, flexing of the cantilever 5 and the platform hull 2 can for instance be accommodated by providing that the fixation of the cantilever 5 by the distal fastening arrangement 27, when in a condition retaining the cantilever 5 in the retracted position in position relative to the platform hull 2, allows some displacement of the cantilever 5 relative to the platform hull 2 in longitudinal direction.When the platform is abandoned in rough seas, the cantilever 5 and the platform hull 2 tend to flex slightly. If, as in the present example, the cantilever 5 is fixed against movement relative to the platform hull 2 in longitudinal directions X at its proximal end 15, flexing of the cantilever 5 and the platform hull 2 can for instance be accommodated by providing that the fixation of the cantilever 5 by the distal fastening arrangement 27, when in a condition retaining the cantilever 5 in the retracted position in position relative to the platform hull 2, allows some displacement of the cantilever 5 relative to the platform hull 2 in longitudinal direction.
As is illustrated by Figs. 5-9, the allowed displacement of the cantilever 5 relative to the platform hull 2 in the longitudinal directions X is within a longitudinal clearance (sum of first open spaces 34 in longitudinal directions X) larger than a transversal clearance (sum of second open spaces 35 in transverse directions Y), if any, allowing more displacement of the cantilever 5 relative to the platform hull 2 in the longitudinal direction X than in the transverse direction Y, if any. Preferably the clearance in X direction is larger than 10 mm and, in order of increasing preference, the clearance in X direction may be larger than 20 mm, 30 mm or 40 mm. Preferably, the clearance in X direction is smaller than 150 mm and more preferably smaller than 120 mm. Preferably the clearance in Y direction is smaller than 10 mm and, in order of increasing preference, the clearance in Y direction may be smaller than 5 mm or 2mm. Preferably, the clearance in Y direction is larger than 0.25 mm.As is illustrated by Figs. 5-9, the allowed displacement of the cantilever 5 relative to the platform hull 2 in the longitudinal directions X is within a longitudinal clearance (sum of first open spaces 34 in longitudinal directions X) larger than a transversal clearance (sum of second open spaces 35 in transverse directions Y), if any, allowing more displacement of the cantilever 5 relative to the platform hull 2 in the longitudinal direction X than in the transverse direction Y, if any. Preferably the clearance in X direction is larger than 10 mm and, in order of increasing preference, the clearance in X direction may be larger than 20 mm, 30 mm or 40 mm. Preferably, the clearance in X direction is narrower than 150 mm and more preferably narrower than 120 mm. Preferably the clearance in Y direction is narrower than 10 mm and, in order of increasing preference, the clearance in Y direction may be narrower than 5 mm or 2 mm. Preferably, the clearance in Y direction is larger than 0.25 mm.
In the present example, this is achieved by providing that the first retaining portion 28 of the distal seafastening arrangement 27 is a pin 28 projecting into the second retaining portion 29, which is an aperture 29, when the distal seafastening arrangement 27 is in seafastened condition. More specifically, the aperture 29 has dimensions allowing longitudinal movement of the pin 28 relative to the rail 32 and limiting transverse movement of the pin 28 completely or at least more strictly than movement in the longitudinal directions X. The basically rectangular shape of the aperture 29 and of the distal end of the pin 28 provide larger load transfer surface areas in transverse directions than would be provided by a circular or otherwise rounded shape providing clearances in perpendicular directions.In the present example, this is achieved by providing that the first retaining portion 28 of the distal seafastening arrangement 27 is a pin 28 projecting into the second retaining portion 29, which is an aperture 29, when the distal seafastening arrangement 27 is in seafastened condition . More specifically, the aperture 29 has dimensions allowing longitudinal movement of the pin 28 relative to the rail 32 and limiting transverse movement of the pin 28 completely or at least more strictly than movement in the longitudinal directions X. The basically rectangular shape of the aperture 29 and of the distal end of the pin 28 provide larger load transfer surface areas in transverse directions than would be provided by a circular or otherwise rounded shape providing clearances in perpendicular directions.
At least the lower end of the pin 28, which is to be inserted in the aperture 29, and the aperture 29 have corresponding shapes with a relatively tight fit in transverse directions Y, while in longitudinal directions X a significant clearance is left to prevent the pin 28 from being loaded with longitudinal loads. The upper part of the pin 28 has larger cross-sectional dimensions than the lower end, providing a shoulder 46 determining vertical movement of the pin 28 towards the guide 10 during seafastening, so that the depth of the aperture 29 and the vertical distance between the cantilever 5 and the guide 10 does not have to meet tight tolerances. Also, the lower end of the pin and the opening may thus be relatively small, so that the structural integrity of the rail is compromised to a small extent only, while the upper part of the pin may be of a relatively large cross-section, so that the pin has a large bending strength.At least the lower end of the pin 28, which is inserted in the aperture 29, and the aperture 29 have corresponding shapes with a relatively tight fit in transverse directions Y, while in longitudinal directions X a significant clearance is left to prevent the pin 28 from being loaded with longitudinal loads. The upper part of the pin 28 has larger cross-sectional dimensions than the lower end, providing a shoulder 46 determining vertical movement of the pin 28 towards the guide 10 during seafastening, so that the depth of the aperture 29 and the vertical distance between the cantilever 5 and the guide 10 does not have to meet tight tolerances. Also, the lower end of the pin and the opening may be relatively small, so that the structural integrity of the rail is compromised to a small extent only, while the upper part of the pin may be a relatively large cross-section, so that the pin has a large bending strength.
For particularly easy operation of the distal seafastening arrangement 27, the distal seafastening arrangement 27 includes a pin actuator 36 for moving the pin 28 between an extended position projecting into the aperture 29 and a retracted position retracted out of the aperture 29. The pin actuator 36 may for instance be in the form of a linear motor, a spindle drive or a hydraulic cylinder. As an addition or alternative, a manually operated spindle may be provided.For particularly easy operation of the distal seafastening arrangement 27, the distal seafastening arrangement 27 includes a pin actuator 36 for moving the pin 28 between an extended position projecting into the aperture 29 and a retracted position retracted out of the aperture 29. The pin actuator 36 may for instance be in the form of a linear engine, a spindle drive or a hydraulic cylinder. As an addition or alternative, a manually operated spindle may be provided.
The pin or the hole may have a tapered portion, or an actuated wedging part may be inserted into the hole, for causing wedging engagement between the pin and the hole in the transverse direction to achieve zero clearance in transverse directions.The pin or the hole may have a tapered portion, or an actuated wedging part may be inserted into the hole, for causing wedging engagement between the pin and the hole in the transverse direction to achieve zero clearance in transverse directions.
The pin 28 is mounted to the cantilever 5 and the pin-receiving aperture 29 is provided in the second guide 10. This allows the movable parts to be provided on a bottom side of the cantilever 5, where these parts are shielded relatively well from weather influences, in particular if the pin is inside the cantilever, and are less easily damaged during operations on the platform deck.The pin 28 is mounted to the cantilever 5 and the pin-receiving aperture 29 is provided in the second guide 10. This allows the movable parts to be provided on a bottom side of the cantilever 5, where these parts are shielded relatively well from weather influences, in particular if the pin is inside the cantilever, and are less easily damaged during operations on the platform deck.
The pin actuator 28 is preferably arranged for causing the pin 28 to be urged towards the extended position, e.g. by gravity and/or spring force, so that the pin 28 enters into the aperture 29 if the aperture 29 is in line with the pin 28. Thus, the cantilever 5 can simply be skidded slowly in transverse direction until the pin 28 snaps into the aperture 29 and does not have to be skidded into a position in which the pin 28 and the aperture 29 aligned with particular precision.The pin actuator 28 is preferably arranged for causing the pin 28 to be urged towards the extended position, eg by gravity and / or spring force, so that the pin 28 enters into the aperture 29 if the aperture 29 is in line with the pin 28 Thus, the cantilever 5 can simply be skidded slowly in transverse direction until the pin 28 snaps into the aperture 29 and does not have to be skidded into a position in which the pin 28 and the aperture 29 aligned with particular precision.
Depending on the size and weight of the cantilever, the distal seafastening arrangement may provide engagement between first and second retaining portions thereof at one or several positions under the cantilever.Depending on the size and weight of the cantilever, the distal seafastening arrangement may provide engagement between first and second retaining portions at one or several positions under the cantilever.
As is best seen in Figs. 5 and 6, the location of the pin 28 in the cantilever 5 is optimized for transferring loads to the cantilever 5 by arranging the pin 28 between the girders 37-40 of the moonpool deck 8 and aligned with longitudinal girders 41, 42 along the moonpool 43. The moonpool deck 8 is locally provided with a stiffening plate 44 with an opening 45 allowing the pin 28 to protrude.As is best seen in Figs. 5 and 6, the location of the pin 28 in the cantilever 5 is optimized for transferring loads to the cantilever 5 by arranging the pin 28 between the girders 37-40 of the moonpool deck 8 and aligned with longitudinal girders 41, 42 along the moonpool 43. The moonpool deck 8 is provided locally with a stiffening plate 44 with an opening 45 allowing the pin 28 to protrude.
When seafastening the cantilever 5, first the cantilever 5 is retracted and transversely aligned with the stand 18 for seafastening at the proximal end 15 of the cantilever 5. After the cantilever 5 is secured at its proximal end 15, the cantilever may be moved transversely at its distal end until the first and second retaining portions of the distal seafastening arrangement are aligned to allow mutual engagement. Then, the pin 28 of the distal seafastening arrangement 27 is lowered or released to descend to make contact with the rail 32 of the second guide 10. The skidding system may also be used to slowly align the first and second retaining portions of the distal seafastening arrangement in transverse directions Y for seafastening at its distal end 7 and, when the pin 28 is aligned with the receiving aperture 29, automatically dropping or driving the pin 28 into the receiving aperture 29. The pin 28 may have been urged in engagement direction continuously, with a slight pre-tension.When seafastening the cantilever 5, first the cantilever 5 is retracted and transversely aligned with the position 18 for seafastening at the proximal end 15 of the cantilever 5. After the cantilever 5 is secured at its proximal end 15, the cantilever may be moved transversely at its distal end until the first and second retaining portions of the distal seafastening arrangement are aligned to allow mutual engagement. Then, the pin 28 of the distal seafastening arrangement 27 is lowered or released to descend to make contact with the rail 32 of the second guide 10. The skidding system may also be used to slowly align the first and second retaining portions of the distal seafastening arrangement in transverse directions Y for seafastening at its distal end 7 and, when the pin 28 is aligned with the receiving aperture 29, automatically dropping or driving the pin 28 into the receiving aperture 29. The pin 28 may have been urged in engagement direction continuously , with a slight pre-tension.
Within the framework of the invention, many variations on and alternatives to the described example are conceivable. For instance, the pin 28 of the distal seafastening arrangement may be positioned on or in the platform hull, with the pin extending from the platform hull to the cantilever to be received in an aperture or other pin engagement structure provided as part of the cantilever. The pin may be held and driven by an arrangement in the form of a self-contained structure attached to either the platform hull or the cantilever or that arrangement may be integrated with either the platform hull structure or the cantilever structure.Within the framework of the invention, many variations on and alternatives to the described example are conceivable. For instance, the pin 28 of the distal seafastening arrangement may be positioned on or in the platform hull, with the pin extending from the platform hull to the cantilever to be received in an aperture or other pin engagement structure provided as part of the cantilever. The pin may be hero and driven by an arrangement in the form of a self-contained structure attached to either the platform hull or the cantilever or that arrangement may be integrated with either the platform hull structure or the cantilever structure.
Several features have been described as part of the shown example or alternative embodiments. However, it will be appreciated that the scope of the invention also includes embodiments having combinations of all or some of these features other than the specific combinations of features embodied in the examples. Also, described effects and advantages of features are applicable in 10 general to the features to which these advantages are attributed and not only in the context of the example or in combination with other described features.Several features have been described as part of the shown example or alternative variant. However, it will be appreciated that the scope of the invention also includes combinations of all or some of these features other than the specific combinations or features embodied in the examples. Also, described effects and advantages of features are applicable in 10 general to the features for which these advantages are attributed and not only in the context of the example or in combination with other described features.

Claims (17)

  1. Conclusies Conclusions
    1. Mobiel offshore-platform omvattende: A mobile offshore platform comprising:
    een platformromp die het platform toestaat te drijven; a platform hull that allows the platform to float;
    ten minste drie poten die beweegbaar zijn te geleiden ten opzichte van de platformromp voor verticale beweging ten opzichte van de platformromp; at least three legs movable to be guided relative to the platform body for vertical movement relative to the platform body;
    een pootaandrijver voor aandrijfbeweging van de poten tussen een verlaagde bedrijfspositie waarin de platformromp op getrokken is van een drijfpositie en een trasportpositie waarin een groot gedeelte van de poten uitsteekt boven de drijvende platformromp; a leg driver for driving movement of the legs between a lowered operating position in which the platform hull has been pulled up from a floating position and a trasport position in which a large part of the legs protrudes above the floating platform hull;
    een langgerekte cantilever die beweegbaar is in lengterichtingen van de cantilever tussen een verlengde positie en een ingetrokken positie; an elongated cantilever movable in longitudinal directions of the cantilever between an extended position and a retracted position;
    een bewegingssysteem omvattende een eerste geleider die gemonteerd is aan de cantilever en parallel georiënteerd is aan de cantilever voor het geleiden van beweging van de cantilever in de lengterichtingen, een tweede geleider die gemonteerd is aan de platformromp en die dwars is georiënteerd ten opzichte van de cantilever voor het geleiden van beweging van de cantilever in de richtingen dwars op de cantilever, en ten minste één ondersteun-loper ingericht voor het geleide beweging langs de eerste geleider en de tweede geleider;a motion system comprising a first guide mounted on the cantilever and oriented in parallel to the cantilever for guiding movement of the cantilever in the longitudinal directions, a second guide mounted on the platform body and oriented transversely to the cantilever for guiding movement of the cantilever in the directions transverse to the cantilever, and at least one support runner adapted for guided movement along the first conductor and the second conductor;
    een proximaal zeevast makende inrichting aan een proximaal eindgedeelte van de cantilever voor het in de ingetrokken positie vasthouden van de cantilever in positie ten opzichte van de platformromp; en een distaai zeevast makende inrichting die distaai is gelegen ten opzichte van de proximale zeevast makende inrichting voor het in de ingetrokken positie vasthouden van de cantilever in positie ten opzichte van de platformromp, waarbij, in zeevaste conditie, een eerste vasthoudgedeelte van de distale zeevast makende inrichting en een tweede vasthoudgedeelte van de distale zeevast makende inrichting in een gefixeerde positie ten opzichte van de platformromp in onderlinge aangrijping zijn in een positie onder de cantilever.a proximal marine-securing device at a proximal end portion of the cantilever for retaining the cantilever in the retracted position relative to the platform body; and a distalizing marine-distinguishing device located distantly relative to the proximal marine-locking device for retaining the cantilever in the retracted position relative to the platform hull, wherein, in marine-fixed condition, a first retaining portion of the distal marine-locking device and a second retaining portion of the distal marine securing device in a fixed position relative to the platform hull are in mutual engagement in a position below the cantilever.
  2. 2. Platform volgens conclusie 1, waarbij het eerste vasthoudgedeelte van de distale zeevast makende inrichting is gemonteerd aan de cantilever. The platform of claim 1, wherein the first retaining portion of the distal marine securing device is mounted on the cantilever.
  3. 3. Platform volgens conclusie 2, waarbij het eerste vasthoudgedeelte van de distale zeevast makende inrichting is gemonteerd aan een lager gedeelte van de cantilever dat neerwaarts uitsteekt ten opzichte van meer proximale gedeelten van de cantilever. The platform of claim 2, wherein the first retaining portion of the distal marine securing device is mounted on a lower portion of the cantilever that protrudes downwardly from more proximal portions of the cantilever.
  4. 4. Platform volgens conclusie 3, waarbij het eerste vasthoudgedeelte van de distale zeevast makende inrichting is gemonteerd in een positie onder de eerste geleider. The platform of claim 3, wherein the first retaining portion of the distal marine securing device is mounted in a position below the first conductor.
  5. 5. Platform volgens conclusie 4, waarbij het eerste vasthoudgedeelte van de distale zeevast makende inrichting is gemonteerd in een positie dwars op de ten minste ene ondersteun-loper. The platform of claim 4, wherein the first retaining portion of the distal marine securing device is mounted in a position transverse to the at least one support runner.
  6. 6. Platform volgens één van voorgaande conclusies, waarbij ten minste de eerste geleider of de tweede geleider gevormd is door ten minste één rail. A platform according to any one of the preceding claims, wherein at least the first conductor or the second conductor is formed by at least one rail.
  7. 7. Platform volgens conclusie 6, waarbij ten minste de eerste geleider of de tweede geleider gevormd is door een paar rails. The platform of claim 6, wherein at least the first conductor or the second conductor is formed by a pair of rails.
  8. 8. Platform volgens conclusie 7, waarbij de tweede geleider gevormd is door een paar rails en waarbij een eerste vasthoudgedeelte van de distale zeevast makende inrichting in vast makende conditie aangrijpt op één van de rails van de tweede geleider het dichtste bij een dichtstbijzijnde zijde van de platformromp.A platform according to claim 7, wherein the second conductor is formed by a pair of rails and wherein a first retaining portion of the distal sea-tightening device engages in fastening condition on one of the rails of the second conductor closest to a nearest side of the platform hull.
  9. 9. Platform volgens één van de conclusies 2-8, waarbij de distale vast makende inrichting, wanneer in een conditie waarin de cantilever in de ingetrokken positie ten opzichte van de platformromp gehouden wordt, verplaatsing van de cantilever in de lengterichting toestaat ten opzichte van de platformromp.The platform of any one of claims 2-8, wherein the distal fastening device, when in a condition where the cantilever is held in the retracted position with respect to the platform trunk, allows displacement of the cantilever in the longitudinal direction with respect to the platform hull.
  10. 10. Platform volgens conclusie 9, waarbij de toegestane verplaatsing van de cantilever ten opzichte van de platform romp in de lengterichting binnen een speling ligt die groter is dan een speling, indien aanwezig, die verplaatsing van de cantilever ten opzichte van de platformromp toestaat in de dwarsrichting.The platform of claim 9, wherein the allowable displacement of the cantilever relative to the platform hull in the longitudinal direction is within a clearance greater than a clearance, if any, allowing movement of the cantilever relative to the platform hull in the transverse direction.
  11. 11. Platform volgens één van de voorgaande conclusies, waarbij het eerste vasthoudgedeelte van de distale zeevast makende inrichting een pin is die zich uitstrekt tot in een opening wanneer de distale zeevast makende inrichting in een zeevast gemaakte conditie is.The platform of any one of the preceding claims, wherein the first retaining portion of the distal marine securing device is a pin that extends into an opening when the distal marine securing device is in a marine solidified condition.
  12. 12. Platform volgens conclusie 11, waarbij de distale zeevast makende inrichting een pinaandrijver omvat voor het bewegen van de pin tussen een verlengde positie die zich uitstrekt tot in de opening en een ingetrokken positie teruggetrokken uit de opening.The platform of claim 11, wherein the distal marine securing device comprises a pin driver for moving the pin between an extended position extending into the opening and a retracted position withdrawn from the opening.
  13. 13. Platform volgens conclusie 12, waarbij tenminste de pin, de opening of een wiggedeelte dat met de pin in de opening kan worden ingebracht, een taps toelopend gedeelte heeft om een vastwiggende aangrijping tussen de pin en de opening te veroorzaken. The platform of claim 12, wherein at least the pin, the aperture or a wedge portion that can be inserted into the aperture with the pin has a tapered portion to cause a locking engagement between the pin and the aperture.
  14. 14. Platform volgens één van de conclusies 11-13, waarbij de pin gemonteerd is aan de cantilever en de pin-opnemende opening voorzien is in de tweede geleider. The platform of any one of claims 11-13, wherein the pin is mounted on the cantilever and the pin receiving opening is provided in the second guide.
  15. 15. Platform volgens conclusie 12 of 13 en volgens conclusie 14, waarbij de pinaandrijver is ingericht om te veroorzaken dat de pin naar de verlengde positie wordt gedreven zodat de pin de opening ingaat als de opening in lijn is met de pin. The platform of claim 12 or 13 and claim 14, wherein the pin driver is adapted to cause the pin to be driven to the extended position so that the pin enters the opening when the opening is aligned with the pin.
  16. 16. Werkwijze voor het zeevast maken van een cantilever van een mobiel offshoreplatform omvattende: A method for making a cantilever of a mobile offshore platform seafast comprising:
    een platformromp die het platform toestaat te drijven; a platform hull that allows the platform to float;
    ten minste drie poten die beweegbaar geleid zijn ten opzichte van de platformromp voor verticale beweging ten opzichte van de platformromp; at least three legs that are movably guided relative to the platform body for vertical movement relative to the platform body;
    een pootaandrijver voor aandrijfbeweging van de poten tussen een verlaagde bedrijfspositie waarin de platformromp opgetrokken is van een drijfniveau en een transportpositie waarin een groot gedeelte van de poten uitsteekt boven de drijvende platformromp; a leg driver for driving movement of the legs between a lowered operating position in which the platform hull is raised from a floating level and a transport position in which a large part of the legs protrudes above the floating platform hull;
    een langgerekte cantilever die beweegbaar is in lengterichtingen van de cantilever tussen een verlengde positie en een ingetrokken positie; an elongated cantilever movable in longitudinal directions of the cantilever between an extended position and a retracted position;
    een bewegingssysteem omvattende een eerste geleider die gemonteerd is aan de cantilever en parallel aan de cantilever georiënteerd is voor het geleiden van beweging van de cantilever in de lengterichtingen, een tweede geleider die gemonteerd is aan de platformromp en die dwars op de cantilever georiënteerd is voor het geleiden van beweging van de cantilever in de richtingen dwars op de cantilever, en ten minste één ondersteun-loper die ingericht is voor het geleide beweging langs de eerste geleider en de tweede geleider;a motion system comprising a first guide mounted on the cantilever and oriented parallel to the cantilever for guiding movement of the cantilever in the longitudinal directions, a second guide mounted on the platform hull and oriented transversely to the cantilever for guiding movement of the cantilever in the directions transverse to the cantilever, and at least one support runner adapted for guided movement along the first conductor and the second conductor;
    waarbij de cantilever zeevast gemaakt wordt door:the cantilever being made seafast by:
    het fixeren van een proximaal eindgedeelte van de cantilever ten opzichte van de platformromp voor het vasthouden van de cantilever in de ingetrokken positie ten opzichte van de platformromp; en het fixeren van een distaai eindgedeelte van de cantilever ten opzichte van de platformromp onder gebruikmaking van een distaai zeevast makende inrichting die distaai is gelegen van de proximate zeevast makende inrichting, voor het vasthouden van de cantilever in de ingetrokken positie in positie ten opzichte van de platformromp, door het veroorzaken van onderlinge aangrijping in een positie onder de cantilever tussen een eerste vasthoudgedeelte van de distale zeevast makende inrichting en een tweede vasthoudgedeelte van de distale zeevast makende inrichting in een gefixeerde positie ten opzichte van de platformromp.fixing a proximal end portion of the cantilever with respect to the platform trunk for holding the cantilever in the retracted position relative to the platform trunk; and fixing a distal end portion of the cantilever relative to the platform hull using a distalize making device remote from the proximate setting making device for holding the cantilever in the retracted position in position relative to the cantilever. platform hull by causing mutual engagement in a position below the cantilever between a first retaining portion of the distal marine securing device and a second retaining portion of the distal marine securing device in a fixed position relative to the platform hull.
  17. 17. Werkwijze volgens conclusie 16, waarbij de werkwijze verder dwarsbeweging van het distale gedeelte van de cantilever omvat totdat uitlijning van het eerste vasthoudgedeelte van de distale zeevast makende inrichting en het tweede vasthoudgedeelte van de distale zeevast makende inrichting bereikt is, nadat het proximate eindgedeelte gefixeerd is ten opzichte van de romp en voorafgaand aan het fixeren van het distale eindgedeelte ten opzichte van de romp.The method of claim 16, wherein the method further comprises transverse movement of the distal portion of the cantilever until alignment of the first retaining portion of the distal marine solidifying device and the second retaining portion of the distal marine solidifying device is achieved after the proximate end portion is fixed is relative to the trunk and prior to fixing the distal end portion to the trunk.
    1/71/7
NL2019115A 2017-06-23 2017-06-23 Seafastening of a cantilever on a mobile offshore platform NL2019115B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2019115A NL2019115B1 (en) 2017-06-23 2017-06-23 Seafastening of a cantilever on a mobile offshore platform

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL2019115A NL2019115B1 (en) 2017-06-23 2017-06-23 Seafastening of a cantilever on a mobile offshore platform
PCT/NL2018/050399 WO2018236214A1 (en) 2017-06-23 2018-06-21 Seafastening of a cantilever on a mobile offshore platform
CN201880053856.1A CN110998028A (en) 2017-06-23 2018-06-21 Seaworthiness fixation of a cantilever on a mobile offshore platform
SG11201912885YA SG11201912885YA (en) 2017-06-23 2018-06-21 Seafastening of a cantilever on a mobile offshore platform

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NL2022730B1 (en) * 2019-03-12 2020-09-18 Itrec Bv Offshore system

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US8926224B2 (en) * 2013-03-15 2015-01-06 Offshore Technology Development Multi-direction direct cantilever skidding system

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WO2007043856A1 (en) * 2005-10-11 2007-04-19 Itrec B.V. Offshore platform with movable cantilever extending beyond the deck
CN201826290U (en) * 2010-08-25 2011-05-11 一重集团大连设计研究院有限公司 Rotary cantilever beam device
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US8926224B2 (en) * 2013-03-15 2015-01-06 Offshore Technology Development Multi-direction direct cantilever skidding system

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