WO2015052295A1 - Fondation gravitaire - Google Patents

Fondation gravitaire Download PDF

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Publication number
WO2015052295A1
WO2015052295A1 PCT/EP2014/071695 EP2014071695W WO2015052295A1 WO 2015052295 A1 WO2015052295 A1 WO 2015052295A1 EP 2014071695 W EP2014071695 W EP 2014071695W WO 2015052295 A1 WO2015052295 A1 WO 2015052295A1
Authority
WO
WIPO (PCT)
Prior art keywords
barge
offshore
foundation body
dock
foundation
Prior art date
Application number
PCT/EP2014/071695
Other languages
German (de)
English (en)
Inventor
Andrea Rosponi
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 WO2015052295A1 publication Critical patent/WO2015052295A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere

Definitions

  • the invention relates to a method for gravity foundation of an offshore facility by lowering and an offshore facility and a barge as a floating body for performing the method.
  • gravity foundations are either built directly on the seabed towards the water surface with the help of a cofferdam or floating, for example by means of a caisson or caisson, also with the help of pressure, from the water surface towards the seabed or built on land, transported to location and on the seabed lowered.
  • a method for lowering today various technologies are used: By building a foundation body within a caisson, by discharging stacked ring boxes or by means of controlled ballasting prefabricated structures
  • the lighthouse "Roter Sand” was founded by means of a caisson as the first offshore structure and completed in 1885.
  • the construction consists of a 36-meter high base dome made in a dock, which was floated in a Norwegian fjord and completed using a slipform process to form three 343-meter-long pillars. The structure was completely re-floated for transport and then towed to location and lowered there controlled by Ballastung.
  • the platform Hanze F2A was built in 2000 as a box-shaped steel construction on land, pulled to location in the Hanze field and founded by controlled lowering by ballasting in the North Sea.
  • a foundation for an offshore structure and a method for creating a foundation of an offshore structure are known.
  • the foundation is held laterally by means of a crane construction on a barge and lowered laterally next to the barge.
  • the arrangement of foundation and barge is not very stable and susceptible to external forces, such as by waves. It is therefore an object of the invention to provide a method of the type mentioned, which allows the easier establishment of an offshore construction facility, and to provide an arrangement of barge and offshore facility for carrying out the method.
  • the object is achieved in its first aspect by an initially mentioned method with the features of claim 1.
  • the offshore facility is kept in a dock. Conveniently, it is placed on a floor of the dock and is kept there.
  • a barge is connected to at least one lowering means with the offshore facility.
  • the offshore facility comprises a foundation body on which the offshore facility, after gravity formation, stands with its full weight and in contact with the seabed. Preferably, otherwise, no component of the offshore facility has contact with the seabed after the foundation of gravity.
  • Under a barge here is very generally a load-bearing ship or a suitably shaped float to understand.
  • the arrangement of offshore facility and barge becomes buoyant. The arrangement is floated and spent from the dock on location. In the arrangement of the foundation body sea bottom side of the barge is arranged.
  • the offshore device can be pulled up to the barge by means of the at least one lowering means, and the foundation body is preferably kept on the sea-bottom side of its hull. At location, the offshore facility is stably lowered to a preferably pre-prepared area of seabed and established by gravity.
  • the offshore facility is kept substantially ready in the dock. It is conveniently not buoyant by itself. Floating is only the arrangement of barge and offshore facility.
  • the barge serves as a means of transport and float for the offshore installation while the offshore facility is being used.
  • the inventive method makes use of the idea of having an offshore facility with its foundation structure in a dock.
  • the offshore facility is essentially already fully assembled. For example, it may already have a foundation structure with a foundation body and the essentially complete platform arrangement in the dock. It is connected without further structural changes by means of a lowering system installed on a barge with the barge and lowered stable to location. To lower only the lowering system is necessary. In addition, temporary facilities such as constructive compartments, buoys, pipes, valves, pumps are not needed for stable lowering.
  • the offshore facility is lowered by means of at least one lowering device to the seabed, without thereby the structural arrangement of the individual components of the offshore facility to each other must be changed.
  • the offshore device is kept ready in a flooded dock and the barge is moved up to the offshore facility in the dock and then water is let out of the dock and the barge is connected to the offshore facility by the lowering device.
  • the development according to the invention makes use of the use of conventional docks, wherein the offshore device can first be mounted in a dry dock, as far as until the offshore device can be moved to establish a gravitational force.
  • the dock can then be flooded so that the barge can enter the flooded dock by opening dock gates and then connecting to the offshore facility and then to the offshore facility via the lowering means.
  • the dock gates are closed again, the dock with the barge and the offshore facility drained, so that the barge sinks with the sinking water level in the dock.
  • the offshore facility has a widened foundation body.
  • dock blocks are provided in a development of the invention, which have a dockêtab solvede flat bearing surface. Also, the foundation body of the offshore facility on a dock floor side flat bearing surface.
  • the bearing surfaces of the docking blocks and the foundation body are advantageously aligned with each other, so that the sinking barge, which also has a flat flat underwater surface conveniently rests stable on the dock blocks and the foundation body.
  • the dock is not completely emptied, but the water level lowered so far that the barge rests with a part of its hull on the foundation body and otherwise still floats in the water.
  • the barge which is lowered onto the foundation body and the dock blocks, is conveniently connected via the lowering means to the foundation body of the offshore installation in the dry dock.
  • an offshore side portion of the barge hull is provided with a fender for cushioning the impact of the at least one offshore support with the barge upon relative horizontal movement.
  • the offshore facility itself is not buoyant.
  • Floating is the arrangement of barge and associated with the barge offshore facility.
  • the offshore device can be lowered to location by the action of gravity. It is not necessary to provide the offshore facility with ballast to allow for lowering.
  • the weight force is greater than the largest buoyancy force acting during the entire lowering process.
  • an already independently floatable offshore facility is kept ready.
  • the offshore device is filled during lowering with ballast, especially seawater, so that the weight is greater than the respective buoyant force at any time and at any subsidence.
  • stranded joint systems are used, along the barge two rows of Litzenhebern are provided along the foundation body and two rows of fasteners for strands are provided, each one Litzenheber corresponds to one of the fasteners and through each of the strand jacks a strand is guided, one end of which is firmly and stably connected under tensile loads on the fastening device with the foundation body.
  • the strands have one minimum length when the barge rests on the bearing surface of the foundation body.
  • the strands are firmly locked with the strand lifters. Subsequently, the dock is flooded again.
  • the barge and the offshore platform are dimensioned so that the lift of the barge is sufficient to lift the barge and the offshore platform firmly connected to it via the strand jack systems.
  • the lowering means may also be a crane or a crane-like device.
  • individual ballast cells of the barge can be filled with seawater to counterbalance the offshore platform so that the barge and offshore platform arrangement is substantially horizontal in the water.
  • the barge is moved with connected and raised offshore platform floating from the dock and placed on location. There is conveniently prepared an area of the seabed.
  • the offshore platform is moved exactly horizontally across the area by means of the barge and the offshore platform is then lowered by means of the stranded lifter system so that a seabed side of the foundation body rests on the area.
  • the offshore facility is gravitational. After the foundation of gravity, a region of the seabed surrounding the foundation body and previously excavated may be backfilled. It is conceivable that the seabed is additionally covered after being backfilled with layers which prevent solid outgrowth. In principle, other developments of the method are also conceivable. Depending on local conditions, the seabed in particular need not necessarily be prepared.
  • the foundation body is lowered to a base frame, which was previously embedded in the seabed.
  • the process in reverse order of the above-mentioned process steps can also be carried out for the dismantling of an offshore facility.
  • the barge is moved over the foundation body of the offshore facility, connected to the at least one lowering device to the foundation body, and the foundation body is preferably freed during lifting or temporally just before the lifting of ballast, and the offshore facility is raised.
  • the object is achieved by an arrangement of an offshore facility and a barge with the features of claim 6.
  • the arrangement of offshore facility and barge is suitable for carrying out one or more of the above-mentioned methods.
  • the inventive offshore device comprises a foundation body and at least one support between the foundation body and a structure, in particular a platform arrangement.
  • the at least one support is arranged eccentrically with respect to the foundation body, and a center of gravity of the offshore device is preferably horizontal, laterally spaced the at least one support between the foundation body and the support, and the barge and the offshore device are connectable to each other by lowering means.
  • An offshore facility can be understood to mean oil production platforms, lighthouses, wind turbine foundations, and so on.
  • the offshore facility in the dock is already substantially fully assembled.
  • the offshore facility, towed out of the dock and founded, is essentially already operational.
  • the foundation body of the offshore facility is along the vertical extent of the arrangement sea bottom side of the barge and the structure meeres provokeab Struktur the barge.
  • a length of the at least one support is dimensioned such that the construction of the offshore facility fully lowered to location is arranged during and immediately after lowering meeresbodenab Struktur the barge, so does not collide with the barge.
  • the offshore facility is designed eccentrically according to the invention. It is eccentric with respect to a virtual vertical axis guided by the center of gravity of the offshore platform.
  • the at least one pillar, preferably each of the pillars, preferably the one pillar, lies completely outside the virtual vertical axis. The axis thus does not cut the support.
  • the offshore device is advantageously formed in a cross section through the at least one support and the foundation body is substantially L-shaped.
  • the offshore device is preferably dimensionally stable in its outer overall shape.
  • the offshore device is designed such that its center of gravity is arranged outside an imaginary outer shell of the offshore platform, next to the at least one support and between the foundation body and the platform arrangement such that, when the barge with the offshore platform is firmly connected by lowering means and the offshore facility is raised, the center of gravity of the entire arrangement of barge and offshore facility conveniently located within the outer vertical delimitations of the barge.
  • the lowering means to a Litzenhebersystem being provided on the Barge strand jacks and on an outer wall of the foundation body encircling fasteners, and one strand is guided through each one of the strand jacks and with one end to the fastening device under pressure - And tensile loads firmly connected.
  • the stranded-wire system makes it possible to lower and, if necessary, raise the offshore equipment again.
  • the offshore facility itself is buoyant.
  • For stable lowering tanks are provided in the offshore facility, which constantly increase the weight during the lowering process, thus allowing a stable lowering.
  • the offshore facility alone is preferably not buoyant. It is therefore founded without further ballast by gravity.
  • the arrangement of offshore facility and barge is of course buoyant.
  • FIG. 1 a barge with an offshore platform moving into a dock
  • FIG. 2 a closed and drained dock with the barge and with the offshore platform connected via a strand jack system
  • FIG. 3 shows the flooded dock with the raised offshore platform driven from the flooded dock by means of a barge.
  • FIG. 5 shows the offshore platform positioned above a prepared area of the seabed
  • FIG. 6 shows the lowering of the offshore platform onto the prepared area of the seabed
  • Fig. 7 shows the lowered to the seabed offshore platform and barge withdrawing
  • Fig. 8 is a schematic side view of an offshore platform according to the invention.
  • FIGS. 1 to 7 show a method according to the invention in which an offshore platform 1 according to the invention is brought from a dock 3 to location by means of a barge 2 and founded there by means of gravity foundation.
  • FIG. 1 shows, partly in a sectional view and in a perspective view, the flooded dock 3 with the mounted offshore platform 1, which has a foundation body 4, a monopile 5 and a platform arrangement 6.
  • Dockblocks 8 are provided which have a height above a Dockteils, which corresponds to a height of the foundation body 4 above the Dockteils.
  • Level, Dockêtab masse support surfaces 8a of Dockblocks 8 and a dockêtab preparede support surface 4a of the foundation body 4 are aligned with each other and form a non-contiguous flat support surface for the barge 2 from.
  • 1 shows the barge 2 entering the flooded dock 3 from the sea through the dock gate 7 (not shown).
  • the barge 2 has tanks which can be filled, for example, with seawater, in order to produce balance weights for the further method.
  • Fig. 2 shows the dock 3 with closed dock gate 7 and in the drained state.
  • the seawater is pumped out of the dock 3.
  • the barge 2 is moved exactly above the Dockblocks 8 and the foundation body 4 before draining the dock 3.
  • the seawater level in Dock 3 gradually lowers, and the barge 2 is seated on the support surfaces 8a of the dock blocks 8 and the support surface 4a of the foundation body 4 with its flat underwater side.
  • the barge 2 rests on the dock blocks 8 and the foundation body 4 stable.
  • stranders 20 are provided at one of the offshore platform 1 facing end of the barge 2 stranders 20 are provided.
  • fastening devices 21 are arranged for strands 22.
  • strand 22 On the fastening devices 21 one end of a strand 22 is attached, the other end is guided by an associated strand jacks 20.
  • the strands 22 between strand jacks 20 and fasteners 21 are shortened to a minimum length, so that the offshore platform 1 is fixed and relatively immovably connected to the barge 2.
  • Fig. 3 shows the dock 3 in Fig. 2 in the flooded state.
  • the barge 2 and the offshore platform 1 are firmly connected to each other by means of the Litzenhebersysteme 20, 21, 22.
  • the tanks of the barge 2 are loaded sequentially, so that the barge 2 is substantially horizontal in the water even after lifting the offshore platform 1.
  • the barge 2 Due to the flooding of the dock 3, the barge 2 experiences a sufficiently large lift that lifts the barge 2 including the associated offshore platform 1 from the dock floor.
  • the dock 3 is flooded so far that the offshore platform 1 is positioned with a lower base side above the sea-top bearing surfaces 8a of the dock blocks 8, so that the barge 2 with the raised offshore platform 1 on the dock blocks 8 and moved out of the dock 3 on the sea is spent.
  • Fig. 4 shows the raised with the barge 2 offshore platform 1 just before the location.
  • an area 40 of the seabed is prepared, so that the offshore platform 1 lowered there stands stable on the area 40 and the monopile 5 receives a vertical orientation.
  • Fig. 5 shows the barge 2 with the raised offshore platform 1 directly to location.
  • the foundation body 4 of the offshore platform 1 is arranged directly above the area 40.
  • Fig. 6 shows the lowering operation of the offshore platform 1.
  • the strand jacks 20 are released, and the offshore platform 1 is slowly and carefully lowered by extending the strands 22 onto the pre-prepared area 40 of the seabed.
  • the monopile 5 is guided along the barge 2 by means of a guide, not shown.
  • Fig. 7 shows the lowered to the area 40 offshore platform 1.
  • Fig. 8 shows the offshore platform 1 of Figs. 1 to 7 in a detailed side view.
  • the foundation body 4 of the offshore platform 1 is completely buried in the reclosed seabed.
  • the monopile 5 is not arranged symmetrically or centrically on the foundation body 4, but provided clearly on an outer edge of the foundation body 4 from an axis of symmetry.
  • the foundation body 4 has a substantially cuboidal shape.
  • a platform assembly 6 is provided with three decks: one the foundation body 4 farthest weather deck 80 with other structures, a arranged between the weather deck 80 and the foundation body 4 basement deck 81 and a vigange conception fiction the basement decks 81 sludge deck 82nd wherein the mud deck 82 has a height above the sea level 83 which is still located above the maximum wave height.
  • sea level 83 In the area of sea level 83 are at monopile
  • the area 40 of the seabed is pre-prepared for location. For this, the area 40 is excavated and the bottom of the excavation is filled with a gravel layer 86. On the gravel layer, a foundation layer 87 is applied, on which the lowered foundation body 4 rests. The area of the excavation surrounding the foundation body 4 is backfilled with sand 88 so far that the foundation body 4 is completely covered with sand 88. On the sea level side, two further layers (not shown) may be applied to the reclaimed sand 88 to prevent scumming. On the foundation body 4, the fastening devices 21 are not shown, which make it possible to secure the lowered of the Barge 2 strands 22 on the foundation body 4 fixed position. The fastening devices 21 are dimensioned such that the offshore platform 1 with foundation body 4, monopile 5 and platform assembly 6 can be lifted by means of the strand jacks 20 of the barge 2. LIST OF REFERENCE NUMBERS

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Foundations (AREA)

Abstract

L'invention concerne un procédé pour la fondation gravitaire d'un dispositif offshore (1) présentant un corps de fondation (4), en ce que le dispositif offshore (1) est maintenu à disposition dans un dock (3) et une barge (2) présentant des moyens d'abaissement (20, 21, 22) est reliée au dispositif offshore (1) et le corps de fondation (4) est disposé côté fond de mer de la barge (2) et une disposition formée de la barge (2) et du dispositif offshore (1) devient flottante et la disposition formée de la barge (2) et du dispositif offshore (1) est déplacée du dock (3) vers le site et le dispositif offshore (1) est abaissé de manière stable sur site sur une zone de fond de mer (40) et le dispositif offshore (1) abaissé se trouve sur le corps de fondation (4), la barge (2) étant déplacée verticalement au-dessus d'une section d'un corps de fondation (4) du dispositif offshore (1) et abaissée sur le corps de fondation (4).
PCT/EP2014/071695 2013-10-10 2014-10-09 Fondation gravitaire WO2015052295A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13188158.3A EP2860314B1 (fr) 2013-10-10 2013-10-10 Fondations gravitaires
EP13188158.3 2013-10-10

Publications (1)

Publication Number Publication Date
WO2015052295A1 true WO2015052295A1 (fr) 2015-04-16

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ID=49354487

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/071695 WO2015052295A1 (fr) 2013-10-10 2014-10-09 Fondation gravitaire

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EP (1) EP2860314B1 (fr)
DK (1) DK2860314T3 (fr)
PL (1) PL2860314T3 (fr)
WO (1) WO2015052295A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108216513A (zh) * 2018-02-26 2018-06-29 黄诚 海上工程化平台

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008017785A1 (de) * 2008-04-08 2009-10-15 E.On Energy Projects Gmbh Fundament für ein Offshorebauwerk und Verfahren zum Erstellen eines Fundaments eines Offshorebauwerks

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008017785A1 (de) * 2008-04-08 2009-10-15 E.On Energy Projects Gmbh Fundament für ein Offshorebauwerk und Verfahren zum Erstellen eines Fundaments eines Offshorebauwerks

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108216513A (zh) * 2018-02-26 2018-06-29 黄诚 海上工程化平台
CN108216513B (zh) * 2018-02-26 2023-11-14 黄诚 海上工程化平台

Also Published As

Publication number Publication date
DK2860314T3 (en) 2016-01-25
EP2860314B1 (fr) 2015-10-07
PL2860314T3 (pl) 2016-05-31
EP2860314A1 (fr) 2015-04-15

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