WO2017012950A1 - Plate-forme offshore pourvue d'éléments de liaison mobiles - Google Patents

Plate-forme offshore pourvue d'éléments de liaison mobiles Download PDF

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Publication number
WO2017012950A1
WO2017012950A1 PCT/EP2016/066642 EP2016066642W WO2017012950A1 WO 2017012950 A1 WO2017012950 A1 WO 2017012950A1 EP 2016066642 W EP2016066642 W EP 2016066642W WO 2017012950 A1 WO2017012950 A1 WO 2017012950A1
Authority
WO
WIPO (PCT)
Prior art keywords
platform
support legs
longitudinal direction
connecting elements
offshore structure
Prior art date
Application number
PCT/EP2016/066642
Other languages
German (de)
English (en)
Inventor
Andreas Rosponi
Reiner Klatte
Original Assignee
Overdick Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Overdick Gmbh & Co. Kg filed Critical Overdick Gmbh & Co. Kg
Publication of WO2017012950A1 publication Critical patent/WO2017012950A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
    • 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
    • E02B2017/0039—Methods for placing the offshore structure
    • 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
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/006—Platforms with supporting legs with lattice style supporting legs
    • 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
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0073—Details of sea bottom engaging footing
    • E02B2017/0078—Suction piles, suction cans

Definitions

  • the invention relates to an offshore structure according to the preamble of claim 1.
  • the invention also relates to a method for establishing an offshore structure.
  • EP 2 204 497 A1 discloses a method for installing a floating offshore arrangement.
  • four support legs are provided, which extend vertically from each one squeegee, wherein each of the support legs is arranged on the outside of the suction feet, so that a platform laterally to the support legs between a transport position between the Saug Oh H and an operating position at the free end of the support legs back and forth can be moved.
  • the suction feet arranged on the outside of the support legs occupy a particularly large cross-section.
  • the suction feet when they penetrate into the seabed, the suction feet generate torque on the support legs mounted on the outside thereof.
  • the offshore structure has at least three support legs, wherein the structure may also have four, five or any higher number of support legs.
  • a squeegee is arranged on a longitudinally lower, ie the seabed end facing and assigned to the respective support leg thereby.
  • Each support leg is preferably assigned exactly one squeegee and vice versa.
  • the squeegee is fixedly mounted at the lower end of the associated support leg.
  • the offshore structure has a platform that reciprocates along both the support legs and the suction feet between a transport position and an operating position.
  • each of the support legs is arranged in a cross section perpendicular to the longitudinal direction completely within an outer periphery of the associated suction foot.
  • each of the support legs is not along the outer periphery of the Suction cup sideways.
  • the outer circumference of the suction foot also determines along its virtual extension, preferably parallel to the longitudinal direction, the space in which the associated support leg can be arranged.
  • Each of the support legs is not in a plan view laterally beyond the outer periphery of the associated squeegee.
  • each of the support legs is arranged centrally on the associated squeegee.
  • each of the suction feet is preferably formed in a cross section, preferably each cross section perpendicular to the longitudinal direction in an outer circumference circular.
  • each of the support legs is arranged along each cross section perpendicular to the longitudinal direction along a stroke distance of the platform within the outer periphery or the longitudinally extended outer periphery of the associated suction foot.
  • each suction cup is arranged.
  • the offshore structure according to the invention makes use of the advantage of lowering the platform in the transport position very far in the direction of the seabed so that at least one underside of the platform is arranged between the suction feet, specifically beneath a sea floor-side wall of the respective associated suction foot.
  • the platform itself is buoyant.
  • the suction feet are, at least when they are filled with air, also designed buoyant, so that the offshore structure receives a buoyancy by the at least partially filled with air suction feet and the platform.
  • the depth of the offshore structure in the transport position is crucially determined by how deep the platform can be lowered between the suction feet. A shallow draft is advantageous because the offshore structure can then be mounted in a conventional dock, the dock flooded, and the offshore structure then float out of the dock in the transport position.
  • the buoyancy point of the platform and the buoyancy points of the suction feet fall in the same horizontal plane.
  • the underside of the platform in the transport position is flush with lower edges, preferably the deepest lower edge of the suction feet. In this constellation, the lowest draft of the buoyant offshore structure would be achieved.
  • at least one of the support legs in a cross-sectional plane perpendicular to the longitudinal direction is mounted centrally on the associated squeegee. Particularly preferably, all support legs are mounted centrally on the squeegee. Due to the central arrangement of the support leg on the squeegee is advantageously ensured a uniform load on a skirt of the squeegee when sucking into the seabed.
  • each of the support legs is connected via a connecting element to the platform.
  • the platform is relative to the connecting elements and the connecting elements are designed to be movable relative to the associated support leg and forth.
  • the connecting elements surround the associated support leg at least partially.
  • Each of the connecting elements has the Umgriff opposite at least one guide for the platform.
  • the guide may be in the form of one or more rails which extend in the longitudinal direction and along which the platform engages with corresponding counter-means.
  • each of the support legs and the platform are operatively connected via a first strand jack system, and the connection elements and the associated support legs are in operative connection with each other via a second strand jack system.
  • first strand jack system the connection elements and the associated support legs are in operative connection with each other via a second strand jack system.
  • second strand jack system instead of stranded wire systems, other lifting / lowering systems can be chosen, but they must be designed to withstand the heavy loads of offshore foundation structures. These are preferably hydraulic or pneumatic lifting systems.
  • the encircling of the connecting element is formed semi-cylindrical, from the embrace is then preferably a truss structure inside to the platform down.
  • the connecting elements can also be closed or partially closed, in particular with air-filled cavities, designed to generate additional buoyancy in the floating state and thus to reduce the draft.
  • the object is achieved by a method having the features of claim 9.
  • the method is particularly suitable for carrying out with one of the abovementioned offshore structures by the platform is arranged in a transport position between the at least three suction feet and the floating offshore structure in the transport position on a water surface. It is 'swim' as floating independently on without further buoyancy means like barges or the like meant.
  • the building is floating on location, and on location the support legs are lowered to the seabed. Location means the place in the sea where the offshore structure is founded.
  • the method makes use of the idea to lower the platform between the suction feet even with centrally arranged on the squeegee support legs or only slightly eccentric, at least not about the outer periphery of the squeegee eccentrically protruding support legs, and thus to achieve the lowest possible draft, so that the The offshore structure floats independently and the draft is so low that the offshore structure can be built with the suction feet and the platform in a conventional dock, the dock can be flooded and after the platform is lowered between the suction feet, the building in the Transport position is simply pulled out of the dock with a tractor.
  • connecting elements between the support legs and the platform along the longitudinal direction of the support legs are arranged to move back and forth, and the platform is moved by lowering the support legs first relative to the connecting elements in the longitudinal direction until the platform is arranged on the same height as the connecting elements. If the platform is located at the same horizontal height as the connectors, the connectors are locked to the platform.
  • the connecting elements are moved together with the platform locked to them in the longitudinal direction, and in this way the support legs are further, preferably lowered to the seabed.
  • the platform floats preferably still on the sea.
  • the lowering of the support legs is preferably carried out simultaneously at all support legs.
  • the lowering of the support legs is thus divided into two process sections. In a first method section, the support leg is lowered together with the connecting element, as far as until the platform has reached a maximum longitudinal and maximum position relative to the connecting element. In this position, the platform is firmly connected to the connecting element, for. B. locked, and in a second step, the connecting elements are moved together with the platform relative to the support legs and thus lowered the support legs further to the seabed.
  • the suction feet are pressed into the seabed by creating a vacuum in the suction feet or by applying additional force to the suction feet.
  • the latter can be done by lifting the connecting elements together with the platform out of the sea.
  • the platform is raised to the operating position out of the sea and moved to the upper free ends of the support legs.
  • the connecting elements are fixed relative to the support leg when the platform is moved relative to the connecting element, and the connecting elements are fixed relative to the platform position when the connecting elements are moved together with the platform relative to the support legs.
  • the platform floats first on the water, and the support legs are lowered by means of a first Litzenhebersystems acting between support legs and platform to the seabed.
  • the suction feet can be sucked into the seabed or be pressed in the further process by the weight of the building in the seabed.
  • the platform is raised out of the water to an operating position by means of a second strand jack system which acts in each case between a support leg and a connecting element.
  • the platform In the operating position, the platform is arranged at the longitudinal end of the outermost end of the support legs and is locked there.
  • FIG. 1 shows a detail view in Fig. 1,
  • FIG. 3b the detailed view according to FIG. 3a without corner piece and with a first and second strand lifting system
  • FIG. 5a shows a detail view according to FIG. 3a in a second method step, in which the support leg has been lowered somewhat to the seabed with the suction foot, FIG.
  • FIG. 5b shows the view according to FIG. 5a without corner piece and with the two stranded-wire lifting systems
  • FIG. 6a shows a detailed view according to FIG. 3a in a third method step, in which the platform is firmly connected to a corner piece, FIG.
  • FIG. 7a shows a detailed view according to FIG. 3a in a fourth method step, in which the support leg with suction foot is lowered further to the seabed, FIG.
  • FIG. 7b shows the view according to FIG. 7a without a corner piece and with the two strand jack systems
  • FIGS. FIGS. 8a-8g show eight method steps of the method according to the invention, of which the first four method steps are illustrated in FIGS. 1 to 7b.
  • the offshore structure as shown in Fig. 1 has four support legs 1, of which in Fig.1 only the two front are shown.
  • a squeegee 2 is arranged at a sea bottom end.
  • Each of the suction feet 2 is circular in a horizontal cross section along its entire extension in a longitudinal direction L in an outer circumference.
  • the support legs 1 are also circular in their cross-section along their entire extent in the longitudinal direction L in its outer periphery.
  • a diameter of the support legs 1 and the suction feet 2 is in Lengthwise L always the same.
  • Each of the support legs 1 is mounted centrally on a sea floor-side wall 3 of the associated squeegee 2.
  • each of the four support legs 1 are each additionally connected via a lateral truss structure 4 outside with the associated squeegee 2.
  • the respective inner side of the four support legs 1 has no truss structure 4.
  • a corner piece 6 is arranged in the longitudinal direction L to move back and forth.
  • each of the four corner pieces 6 can be locked in different positions along the associated support leg 1.
  • a platform 7 which can be moved back and forth in the longitudinal direction L is provided between the support legs 1.
  • the platform 7 has over its entire horizontal extent an approximately equal thickness, d. H. Extension in the longitudinal direction L on.
  • Fig. 1 shows the platform 7 in a transport position. In the transport position, the platform 7 is arranged between the four suction feet 2.
  • the suction feet 2 are filled in the transport position at least in the longitudinal direction L upper portion with air.
  • the platform 7 is buoyant alone, and in the transport position are the platform 7 as well as the four suction feet
  • an underside 9 of the platform 7 is disposed below the sea floor-side wall 3 of the four suction feet 2, and a buoyancy point of the platform 7 is also disposed below the sea bottom-side wall 3 of the suction feet 2.
  • a squeegee 2 is a hollow, to a seabed 1 1 open towards interior understood, which is surrounded by a skirt 12 and can be pressed under pressure into the seabed 1 1, but it can also be provided a pump, the air and Water sucks out of the interior of the respective squeegee 2 and thus pulls the squeegee 2 during the formation process in the seabed 1 1.
  • the platform 7 has no direct connection with one of the four support legs 1 in the transport position.
  • the underside 9 of the platform is arranged on the sea-bottom side below the four sea-bottom-side ends of the support legs 1.
  • FIG. 1 The hatched area in FIG. 1 is shown enlarged in FIGS. 3a, 3b.
  • Fig. 2 shows the arrangement of Fig. 1 in a sectional view taken along the line II-II.
  • the four support legs 1, which are circular in cross-section, are arranged in corners of an imaginary square and peripherally surrounded by a frame structure 13 which is fixedly connected to the four lateral framework structures 4.
  • the frame structure 13 and the framework structures 4 give the foundation structure sufficient strength, in particular against loads acting laterally on the support legs 1.
  • a corner piece 6 is provided on each of the support legs 1 in the longitudinal direction L to move back and forth along the associated support leg 1.
  • Each of the corner pieces 6 has inwardly projecting arms.
  • It can be a frame structure; However, the corner pieces 6 may also be formed closed or form a mixture of both.
  • the platform 7 is circumferentially adapted in its horizontal cross-section to an inner area formed between the suction feet 2, so that the platform 7 is lowered in the longitudinal direction L between all suction feet 2, so that a horizontal cross-section of each of the complete cross-sections of the suction cups 2 and the complete cross section of the platform 7 detected.
  • Fig. 3a a part of the construction of the offshore structure in Fig. 1 is shown.
  • Each of the four corners of the foundation structure has the same structure as the partial construction of Fig. 3a.
  • the squeegee 2 is open to the seabed 1 1 towards cylindrical.
  • the squeegee 2 can also be formed significantly longer or shorter than the illustrated suction 2 with respect to the relationships to each other and in relation to other components such as support leg 1 or platform 7.
  • the squeegee 2 can also smaller or larger in relation to the other components Have diameter.
  • the squeegee 2 also does not have to be circular in outer or inner circumference in the horizontal cross section, but may in principle have any shape.
  • the bottom of the seabed is mounted centrally in the longitudinal direction L on top of the squeegee 2, the support leg 1, which extends from the seabed 1 1 vertically upwards.
  • the support leg 1 with the truss structure 4 for reasons of stability in addition to the squeegee 2, preferably the apron 12 and the meeresêtab solution wall 3 is connected fixed in position.
  • the movable in the longitudinal direction L back and forth corner piece 6 is provided on the inside of the support leg 1, the movable in the longitudinal direction L back and forth corner piece 6 is provided. The platform 7 is lowered so far in the transport position shown in Fig.
  • the platform 7 In the transport position, the platform 7 is fixed to the squeegee 2 at several points. For fixing bolts or similar fixatives may be provided, which can be solved later after the offshore structure is moved to location. Also, the movable corner piece 6 is temporarily fixedly connected to a fixing means on the suction foot 2 or a reinforcing strut 15, which goes off from the suction 2. In the position shown in Fig. 3a, the entire offshore foundation structure floats on the water. Each of the four suction feet 2 is arranged in a transport position shown in FIG. Both the platform 7 and the four suction feet 2 contribute to the buoyancy. Together, they generate sufficient buoyancy for the structure.
  • FIG. 2 The hatched area in FIG. 2 is shown enlarged in FIG. 4.
  • Fig. 3b the inner life of the corner is shown in Fig. 3a as it were.
  • the movable corner piece 6 is almost completely removed.
  • the corner piece 6 has a semi-cylindrical shell 16, which is shown as part of the corner piece 6 and which engages around the support leg 1 from the inside.
  • a second arm 17 for fixing one end of a second strand jack system 18 is fixed, the first end of which is provided at the sea bottom-side end of the associated support leg 1.
  • the second strand jack system 18 makes it possible to lift the movable corner piece 6 in the longitudinal direction L alone and / or together with the platform 7 or to lower the movable corner piece 6 by gravity counter to the longitudinal direction L.
  • a first strand lifter system 19 is provided between the suction foot 2 and the platform 7.
  • the first Litzenhebersystem 19 is connected at a sea floor ab physicallyen end to the platform 7 with a first arm 21, which is derived from the platform 7, and fixedly connected at a sea bottom end with an outgoing from the squeegee 2 eyelet 22.
  • the first strand lifter system 19 makes it possible to lower the squeegee 2 together with the support leg 1 in the direction of the seabed 11, while the platform 7 floats on the sea.
  • the squeegee 2 is flooded with water, for example, by opening an air outlet (not shown).
  • Fig. 4 a part of Fig. 2 is shown; this is a sectional view of Fig. 3a.
  • the vertical sectional view shows the centrally arranged on the squeegee 2 support leg. 1
  • the support leg 1 is only touched by the semi-cylindrical shell 16 of the support leg 1.
  • a radial extent in the horizontal direction of the corner piece 6 corresponds to slightly more than a radius of the suction foot 2 in the horizontal direction, at least in a portion into which the platform 7 is lowered in the transport position.
  • Rails 23 arranged on the inside of the corner piece 6 project beyond a radial outer circumference of the suction foot 2.
  • the platform 7 has with the rails 23 corresponding counterparts.
  • the platform 7 can be lowered with the rails 23 and corresponding counterparts with the aid of the first strand lifter system 19 between the suction feet 2.
  • 4 shows two first strand lifters and four second strand lifters, which jointly form the first strand lifter system 19 and the second strand lifter system 18, respectively.
  • FIG. 5 a shows a second method step of the inventive foundation process.
  • the offshore structure according to the invention has the great advantage over conventional alone floatable offshore structures that their draft is very low, since the platform 7 can be lowered between the suction feet 2 and thus in the transport position for transporting the offshore structure a small draft has, so that the offshore structure of FIG. 1 in conventional docks can first be completely manufactured, the dock can then be flooded and the offshore structure in the transport position in the dock floating independently and can be pulled out of the dock by means of a tractor. To support the platform 7 can of course also be attacked at sea with a barge.
  • FIG. 5a shows, in comparison to FIG.
  • Fig. 6a shows a third method step.
  • the platform 7 is further displaced in the longitudinal direction L relative to the support leg 1 and occupies its operating position with respect to the corner piece 6. It is displaced in the longitudinal direction L up to the uppermost end of the corner piece 6 and is firmly connected in the operating position with the corner piece 6.
  • the corner piece 6 is still arranged opposite the support leg 1 in the transport position, ie in the lowermost position on the support leg 1.
  • FIG. 6b shows, in comparison to FIG. 5a, that the first strand lifter system 19 has been further extended.
  • the second strand jack system 18 is still not actuated.
  • Fig. 7a the fixed connection between the corner piece 6 and the support leg 1 is solved in a fourth method step, and the first strand lifter system 19 is further extended, so that the support leg 1 can sink with the squeegee 2 towards the seabed 1 1 out, until the squeegee 2 has reached the seabed 1 1.
  • the second strand jack system 18 is shortened, but without receiving load. This situation is shown in Fig. 7b.
  • the second Litzenhebersystem 18 is so far shortened and the first Litzenhebersystem 19 extended so far until the squeegee 2 has reached the seabed 1 1.
  • the first Litzenhebersystem 19 is further extended and the second Litzenhebersystem 18 further shortened.
  • the first Litzhebersystem 19 is extended, but without load and the second Litzenhebersystem 18 further shortened, whereby the platform 7, which is fixedly connected to the corner piece 6, is lifted out of the water and thereby pressure exerts on the suction feet 2, whereby they can be pressed firmly into the seabed 1 1, if no additional suction device is provided.
  • the second strand jack system 18 is shortened until the platform 7 has reached its operating position relative to the support leg 1, that is, is arranged completely at the sea bottom-side end of the support leg 1.
  • the method can be subdivided into the method steps illustrated in FIGS. 8a-8g.
  • the method steps illustrated in the first four FIGS. 8a to 8d correspond to those shown in FIGS.
  • FIGS. 8e, 8f, 8g are not illustrated in detail with reference to separate figures, but these are described in connection with the description of FIG. 7b.
  • Fig. 8e and Fig. 8f it can be seen that by lifting the platform 7 out of the sea an additional force is exerted on the support legs 1, which causes the suction feet 2 are pressed into the seabed 1 1 ,

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Foundations (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un ouvrage en pleine mer comprenant au moins trois pylônes (1), respectivement une embase aspirante (2) située dans une direction longitudinale (L) à une extrémité inférieure de chaque pylône (1), et une plate-forme (7) qui est mobile en va-et-vient le long du pylône (1) et de l'embase aspirante (2), entre une position de transport dans laquelle la plate-forme (7) est disposée entre les embases aspirantes (2), et une position de fonctionnement dans laquelle les embases aspirantes (2) sont disposées sous la plate-forme (7), caractérisé en ce que chaque pylône (1), vu dans un coupe transversale perpendiculaire à la direction longitudinale (L), est disposé entièrement dans les limites du pourtour extérieur de l'embase aspirante (2) associée.
PCT/EP2016/066642 2015-07-20 2016-07-13 Plate-forme offshore pourvue d'éléments de liaison mobiles WO2017012950A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15177487.4A EP3121338B1 (fr) 2015-07-20 2015-07-20 Plate-forme offshore ayant des elements de liaison mobiles
EP15177487.4 2015-07-20

Publications (1)

Publication Number Publication Date
WO2017012950A1 true WO2017012950A1 (fr) 2017-01-26

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PCT/EP2016/066642 WO2017012950A1 (fr) 2015-07-20 2016-07-13 Plate-forme offshore pourvue d'éléments de liaison mobiles

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WO (1) WO2017012950A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1484525A1 (de) * 1963-11-13 1969-09-25 Mannesmann Ag Verfahren und Vorrichtung zum Abstuetzen und Anheben einer schwimmfaehigen Plattform bzw. einer Hubinsel
US20110129304A1 (en) * 2009-11-27 2011-06-02 Jialiang Wu Support Leg and A Mobile Offshore Work Platform
NL2004357C2 (en) * 2010-03-08 2011-09-09 Korndorffer Contracting Internat K C I B V Method for the construction and installation of an offshore platform, offshore platform.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE542958T1 (de) 2008-12-03 2012-02-15 Overdick Gmbh & Co Kg Verfahren zur installation einer schwimmfähigen offshore-anordnung und offshore-anordnung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1484525A1 (de) * 1963-11-13 1969-09-25 Mannesmann Ag Verfahren und Vorrichtung zum Abstuetzen und Anheben einer schwimmfaehigen Plattform bzw. einer Hubinsel
US20110129304A1 (en) * 2009-11-27 2011-06-02 Jialiang Wu Support Leg and A Mobile Offshore Work Platform
NL2004357C2 (en) * 2010-03-08 2011-09-09 Korndorffer Contracting Internat K C I B V Method for the construction and installation of an offshore platform, offshore platform.

Also Published As

Publication number Publication date
EP3121338A1 (fr) 2017-01-25
EP3121338B1 (fr) 2018-03-21

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