FAST TRANSIT SELF-ELEVATING PLATFORMS
A jack-up vehicle having a hull including at least two hull sections (2, 3) interconnected in such manner as to be positionable in an end-to-end relationship having a first vehicle width and for the purpose of movement of the vehicle from one location to another location and to be positionable in a side-by-side configuration having a second vehicle width when at said another location, wherein the first vehicle width is less than the second vehicle width. A jack-up vessel such as this can maintain stability when elevated with square positioning of supporting legs and yet reposition the hull sections to achieve a preferred hull shape for transit from location-to-location at more than twice the usual speed of known jack-up vessels.
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This invention relates to jack-ups, self-elevating platforms, lift boats, jack-up barges or the like. For convenience in this specification they will be hereinafter by referred to as jack-up(s).
BACKGROUNDA jack-up generally includes a sea-going hull mounting a plurality of legs capable of being raised or lowered relative to the hull by associated jacking-up mechanisms/units.
Whilst the jacking-up mechanisms/units can take various forms, the common purpose is to enable the legs to be selectively lowered so that the lower ends of the legs can rest upon the bed of a column of water such as a sea bed and so that after engagement of the legs with said bed the hull can be elevated relative to the lowered legs so as to lift the hull out of water, so that the hull is not affected by any substantial water action.
It will be understood that the reverse operation will be possible i.e., the lowering of the hull back into the water followed by the raising of the legs.
It is intended that a jack-up should be moved either by being towed or under its own propulsion arrangements to a selected location of intended use and to then use the jacking-up mechanisms/units to lower the legs so that they rest upon a ground surface such as a sea or river bed and then to elevate the hull above the surface of the water within which it is located.
One of the characteristics of the form of known jack-ups is that it is highly desirable that the hull thereof should be large enough to provide a deck area that affords as much space as possible to mount any equipment such as, for example, seabed drilling apparatus, and/or crane apparatus for handling equipment/materials associated with whatever operation should be required to be carried out at a location of use.
In addition, an important factor in relation to the usage of a jack-up when in its elevated or jacked-up mode is that whilst it is in operational use, it is important that the four legs of the jack-up should be located as near as possible to the corner regions of a substantially square hull arrangement, in order to produce an operational setting for the legs, when supporting the hull above the surface of the water, that is as stable as possible.
Experience has shown that such a substantially square configuration for the legs is preferable in the event of a local change of support conditions afforded by the sea or river bed in the vicinity of a leg or legs.
This requirement has had a direct consequence in relation to the beam width (i.e. the overall width of the jack-up) of jack-ups as compared with the beam widths of conventional vessels, in that the beam width of the jack-ups adversely affects their movement between locations as compared with movement of conventional vessels. In practice, the wide beam of a conventional jack-up not only significantly reduces the speed at which the jack-up can be moved from location to location, simply because square-shaped hulls do not travel swiftly through water, but additionally affects what may be called its sea keeping, i.e. its response to sea conditions whilst being moved from location to location. Generally, conventional jack-ups are capable of speeds on water of only around 5 knots.
In addition, it is convenient to note that the hull of a jack-up needs to be able to provide adequate storage space for equipment, space for any on-board propulsion unit(s), space for personnel associated with the operation and/or movement of the jack-up and the operation of any equipment required to be operated from the jack-up, and enough space to be able to accommodate the mounting of the legs and any associated jacking-up mechanisms/units.
As a result of factors such as those mentioned above, known jack-ups tend to be broad of beam. In practice, this has been found to introduce handling problems in relation to the positioning of the jack-up at locations where access to a required location of use could involve a relatively narrow channel way for the jack-up.
It is an object of the present invention to provide a jack-up having a construction that facilitates its passage from location to location.
SUMMARY OF THE INVENTIONBroadly according to a first aspect of the invention there is provided a jack-up vehicle having a hull including at least two hull sections interconnected in such manner as to be positionable in an end-to-end relationship having a first vehicle width and for the purpose of movement of the vehicle from one location to another location and to be positionable in a side-by-side configuration having a second vehicle width when at said another location, wherein the first vehicle width is less than the second vehicle width.
Broadly according to a second aspect of the invention there is provided a method of operating a jack-up vehicle comprising arranging at a first location at least two hull sections of the vehicle in an end-to-end relationship and having a first vehicle width, transporting the vehicle to a second location and, at the second location, moving the at least two hull sections into a side-by-side configuration having a second vehicle width, the first vehicle width being smaller than the second vehicle width.
In a first construction the hull includes two hull sections pivoted/hinged together in such manner as to be relatively rotatable between an end-to-end configuration and a side-by-side configuration for the hull sections.
In a further construction, the jack-up includes three hull sections, of which two are pivoted/hinged to opposite sides of the same end of the remaining hull section in such a manner that in a first relative arrangement, the two hull sections can be arranged side-by-side and adjacent the same end of the remaining hull section and in a second arrangement in which the two hull sections can be arranged one to each of respective opposite sides of the remaining hull section.
The advantage of such constructions is that such jack-up vehicles can achieve speeds of up to around 12 knots which is more than twice the usual speeds of conventional vehicles and which thus greatly improves the time taken to travel from location-to-location. This improvement in speed of transit applies to both self-propelled vessels and towed vessels.
For a better understanding of the invention and to show how to carry the same into effect reference will now be made to the accompanying drawings in which;
Referring now to
As will be seen from these
As will be seen from
The leg assemblies 7, 8, 9 and 10 are schematically illustrated and in the Figures and are shown each to include the leg 11 and associated leg position jacking/lifting means 12.
It will be noted that
The Figures also very schematically illustrate safety rail arrangements 14.
In the side-by-side configuration of
When in such position of stability, the equipment provided on the hull can be used to carry out any intended operation at the particular location.
When it is required to move the jack-up to another location, the legs 11 are raised relative to the hull sections. This has the effect of initially effectively lowering the hull sections to return them into the water and then, on further raising of the legs 11, to lift the legs 11 sufficiently high enough to bring them into their docked position relative to the hull so as to allow, when required, free movement of the jack-up along the surface of the water.
It will be clear from
Whilst it is generally possible to move the jack-up from location to location whilst in the configuration shown in
By reason of the double hull section construction the hull sections 2 and 3 in their end-to-end relationship, the drag of the hull is significantly lowered when the jack-up is in transit, so that the speed of possible transit of the jack-up is correspondingly increased.
Thus, with a view to enabling, inter alia, a faster rate of transit to a location or between locations, it is proposed by the present invention to construct the hull sections 2 and 3 such that when they are arranged in end-to-end relationship, as shown in
Referring now to
As may be noted from
In
Referring now to
Conveniently the hull section 21 can be regarded as the main section of the hull 20 with the hull sections hinged/pivoted to each other.
The configuration shown in
It will be noted from
As will be seen from
In
Referring now to
As will be seen from
The jack-up indicated in
In practice, the mounting of the crane 35 is such that when it is required for use, it can be raised or lowered as desired and slewed as required. The hull sections can include a deck region(s) having equipment mounting zones thereon for receiving pieces of equipment. Referring now to
It can be seen that the crane 35 when in its rest position lies within the overall length of the in-line end-to-end arrangement.
In practice, the hull sections 33 and 34 may be turned by providing the hull sections with appropriately located thruster units which when in operation are capable of exerting sufficient side forces upon the hull sections to produce a required direction of movement of the hull sections. Alternatively, the hull sections may be turned by way of cables of a winch or pulley system. Such thrusters can be similar to those conventionally provided on some conventional vessels for the purposes of their handling in confined locations such as required for moving a vessel from a docking position alongside a quay.
Referring to
Referring to
Referring to
A vessel such as that shown in
Claims
1-13. (canceled)
14. A jack-up vehicle having a hull including at least two hull sections and a plurality of legs displaceable substantially vertically relative to the hull sections, said hull sections being interconnected in such manner as to be positionable in an end-to-end relationship having a first vehicle width and for the purpose of movement of the vehicle from one location to another location and to be positionable in a side-by-side configuration having a second vehicle width when at said another location, wherein the first vehicle width is less than the second vehicle width.
15. A jack-up according to claim 14, wherein the at least two hull sections are interconnected by way of a hinge/pivot arrangement.
16. A jack-up according to claim 15, wherein the hinge/pivot arrangement turns about a substantially vertical hinge/pivot axis.
17. A jack-up according to claim 14, wherein a first hull section and a second hull section are interconnected by a first hinge/pivot arrangement located between the first and second sections at respective end regions that form the end-to-end relationship.
18. A jack-up according to claim 17, and further comprising a third hull section and a second hinge/pivot arrangement.
19. A jack-up according to claim 18, wherein the second hinge/pivot arrangement is located at an opposite end region to the first hinge/pivot arrangement.
20. A jack-up according to claim 18, wherein the second hinge/pivot arrangement is located at the same end region to the first hinge/pivot arrangement and on the respective opposite side of the respective hull section.
21. A jack-up according to claim 20, and comprising a major hull section and first and second minor hull sections, the arrangement being such that, in the end-to-end relationship, the minor hull sections are adjacent each other, respective adjacent ends of the minor hull sections laying in a face-to-face relationship with a rear end of the main hull section.
22. A jack-up according to claim 21, wherein the side-by-side configuration is achieved when the minor hull sections are rotated about the first and second hinge/pivot arrangements and come to lie against respective opposite sides of the main hull section.
23. A jack-up according to claim 14, wherein the hull sections include a deck region having equipment mounting zones thereon for receiving pieces of equipment.
24. A method of operating a jack-up vehicle comprising arranging at a first location at least two hull sections of the vehicle in an end-to-end relationship and having a first vehicle width, transporting to a second location the vehicle with a plurality of legs displaceable substantially vertically relative to the hull sections in a raised condition and, at the second location, moving the at least two hull sections into a side-by-side configuration having a second vehicle width and lowering the plurality of legs from the raised condition to a lowered stabilising condition, the first vehicle width being less than the second vehicle width.
25. A method according to claim 24, wherein there is one major hull section and two minor hull sections, and in the end-to-end relationship, the minor hull sections are arranged adjacent each other and against the rear end of the main section, and in the side-by-side configuration, the minor hull sections are moved to bear against respective opposite sides of the main hull section.
Type: Application
Filed: Jun 24, 2011
Publication Date: Dec 5, 2013
Applicant: Fugro Seacore Limited (Falmouth Comwall)
Inventors: John Richard Yorke Gleadowe (Falmouth), Marcus Rampley (Helston)
Application Number: 13/805,210
International Classification: E02B 17/02 (20060101);