EP2623675A1 - Partie supérieure d'une plateforme offshore et procédé d'installation d'une telle partie supérieure d'une plateforme - Google Patents

Partie supérieure d'une plateforme offshore et procédé d'installation d'une telle partie supérieure d'une plateforme Download PDF

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Publication number
EP2623675A1
EP2623675A1 EP12000732.3A EP12000732A EP2623675A1 EP 2623675 A1 EP2623675 A1 EP 2623675A1 EP 12000732 A EP12000732 A EP 12000732A EP 2623675 A1 EP2623675 A1 EP 2623675A1
Authority
EP
European Patent Office
Prior art keywords
legs
platform
substructure
overhangs
leg
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12000732.3A
Other languages
German (de)
English (en)
Inventor
Thomas Bollmohr
Constantin Hagemeister
Matthias Linnemann
Helge Mokros
Frank Mönnig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NORDIC YARDS HOLDING GmbH
Original Assignee
NORDIC YARDS HOLDING GmbH
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 NORDIC YARDS HOLDING GmbH filed Critical NORDIC YARDS HOLDING GmbH
Priority to EP12000732.3A priority Critical patent/EP2623675A1/fr
Priority to US13/757,072 priority patent/US20130220203A1/en
Priority to KR1020130012316A priority patent/KR20130090381A/ko
Publication of EP2623675A1 publication Critical patent/EP2623675A1/fr
Withdrawn legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • 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
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • E02B17/0836—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks
    • E02B17/0872—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks with locking pins engaging holes or cam surfaces

Definitions

  • the invention relates to a platform top for an offshore platform and to a method of installing a platform top for an offshore platform.
  • Offshore platforms are artificial platforms in the sea that are mostly used to house technology and crew quarters.
  • the invention relates in particular to offshore platforms for collecting electrical energy from offshore wind turbines and their forwarding to a land station in the rectified or non-rectified state.
  • Such offshore platforms are also referred to as transformer platforms.
  • the invention is also applicable to other offshore areas.
  • a platform upper part is transported to the installation site on a barge and legs are inserted by means of floating cranes into corresponding bearings of the platform upper part.
  • the legs are placed with their lower ends near the bottom of the sea in the upper openings of the piles and routed with these.
  • Underwater work must be controlled and carried out by means of diving robots or by divers.
  • the object of the invention is to provide a platform upper part for an offshore platform and a method suitable for installing a platform upper part for an offshore platform, which reduces the outlay for the erection of the offshore platform.
  • the platform upper part according to the invention comprises a self-floating, upper structural body with stable floating position, which is preferably made in shipbuilding design of plates and profiles.
  • the upper building can be self-swimming from the shore to the installation site at sea.
  • tractors can be used. It is not necessary to provide the upper structure with its own drive.
  • the use of barges or other means of transport for transporting the platform top to the installation site is eliminated.
  • the width of the waterline of the upper structure is designed so that can be dispensed with the inclusion of ballast water for transit.
  • the platform top can be installed on any substructure having junctions or interfaces for a platform top to be installed above the water surface or in the vicinity under the water surface.
  • the means for supporting legs are arranged in overhangs of the platform upper part and arranged the overhangs and the means for storing above the waterline or in the vicinity below the waterline.
  • the cross-section of the upper structure is designed so that it lies above the waterline in the region of the means for supporting the legs or below the waterline in the vicinity. This ensures that the connection between the platform top (English: top side ) and the substructure (English: base frame ) above the water surface or at close range below the water surface and thus in the field of view can be performed.
  • the platform upper part can be placed with the overhangs above the connection points of the substructure and then the legs can be lowered to the connection points.
  • the means are used to move the legs, which make it possible to relocate the legs in their longitudinal direction.
  • the connection of the legs of the platform upper part can be done with the substructure in the field of view and under particularly favorable conditions. Dive robots or divers are not required.
  • the work can be done from the platform top or from
  • Rafts are made to be positioned next to the overhangs.
  • the use of ship cranes for unloading the platform top from a barge and placing the platform top above the substructure and inserting and lowering the legs can be eliminated.
  • the upper structure has a stable floating position, i. it adjusts itself from laterally inclined position automatically again, provided that the inclination does not exceed a maximum value.
  • the platform can be brought into a defined starting position, from which the legs can be lowered easily to the connection points of the substructure.
  • the substructure can be used as an aid for positioning the platform top.
  • the leg displacement means are used to raise the platform top to an installation height after connecting the legs to the interfaces of the substructure. This height is such that the water level does not reach the platform top and passes through the highest expected wave below the platform top. In this position, the legs are fixed by means of fixing.
  • connection points of the substructure protrude from the water surface by a maximum of 6 meters, furthermore preferably at most 3 meters, furthermore preferably at most 1.5 meters.
  • Preferably arranged under the water surface junctions are located in the field of view below the water surface.
  • the field of vision is the area below the waterline that can be seen by a normal-sighted adult person with an unaided eye.
  • an interface under the waterline can be extended by appropriate alternmahmen the field of view.
  • the embodiment may e.g. with markings in the form of bars or tubes, which are stirred up from the substructure to above the waterline and determine the position of the interface.
  • the joints located below the water surface have a maximum distance of 6 meters from the water surface, further preferably at most 3 meters from the water surface, further preferably at most 1.5 meters from the water surface.
  • the dimensioning of the substructure and the platform shell is based on a certain water level according to water level analysis.
  • This is preferably the water level MW (middle water) or LAT ( lowest astronomical tide ) , also referred to as NGzW (lowest water level) or HAT ( highest astronomical tide ), also referred to as HGzW (highest tide water level) or another defined water level from tidal science.
  • NGzW lowest water level
  • HAT highest astronomical tide
  • HGzW highest tide water level
  • the water level analysis supplies the respective water levels for given installation times.
  • the means for supporting the legs in an upright position or upright position are designed so that they support the legs as vertical as possible.
  • the means for supporting the legs preferably store the legs in a vertical orientation, if necessary with deviations (maximum 5 °, preferably maximum 2 °).
  • the legs are stored in the means for storing and is equipped with the legs platform upper part self-swimming with stable swimming position.
  • the legs are determined by the means for fixing in position in the means for relocating.
  • the upper structure serves as a means of transport for the legs to blur the upper structure together with the legs to the installation site. A separate transport of the legs to the installation at sea can be omitted.
  • the means for fixing the legs are used to fix the legs in a raised starting position during transit from the shore to the installation site at sea. Furthermore, they serve to fix the legs in the lowered position when the legs are connected to the joints of the substructure.
  • the building has overhangs on both sides of a middle part and / or two side parts with overhangs in the form of a bridge.
  • the first variant has the advantage that the joints of the legs with the substructure of locations next to the upper structure are visible and accessible. In addition, the legs are located on the outer edge of the platform upper part, which is advantageous for the statics of the offshore platform.
  • the second variant of the upper structure is formed in cross-section like a catamaran and the two overhangs are united into a single bridge between the two side panels.
  • the third variant is a combination with a central part and side parts on both sides of the middle part and overhangs in the form of the middle part and the side parts connecting bridges.
  • the third variant has a cross-section like a trimaran.
  • the middle part contains one or more buoyancy cells and in the second variant the side parts.
  • the side parts and the middle part Buoyancy cells included.
  • the second variant has a more stable swimming position than the first.
  • the means for supporting legs each have an upper leg bearing and a lower leg bearing arranged at a distance therefrom for supporting a leg.
  • the upper leg bearings are integrated into the main deck of the upper structure and the lower leg bearings are integrated into a bottom wall of the overhangs. This design is constructive and manufacturing technology particularly favorable.
  • the means for displacing in the vertical direction are at the same time the means for fixing the legs in vertical positions.
  • known jacking systems can be used in the design as pins in the pin-in-hole system or strand jacking system . These systems can be partially retrofitted after installation of the platform top and used for other purposes. This applies in particular to the hydraulic and other lifting components.
  • the legs have at the lower end a downwardly tapering cone and / or at a distance from the lower end of a paragraph.
  • the cone serves as an insertion aid when connecting the legs to the substructure.
  • the cone with a pile or one of the Post attached connection unit connected.
  • the pile or connecting unit is hollow cylindrical and the cone is easily inserted into an upper opening of the pile or the connecting units.
  • the platform upper part is equipped with the legs before being brought to the place of installation.
  • the legs are connected above the water surface or in the vicinity of the water surface with piles or towers of a substructure.
  • the legs are positively connected to the piles or towers of a substructure.
  • the substructure is used as a positioning aid of the platform upper part when positioning the platform upper part above the substructure.
  • the means for displacing the legs are at least partially dismantled for the other use of the platform upper part.
  • a cable tower is connected to the substructure after lifting the platform upper part with the platform upper part.
  • top and bottom refer to the placement of the offshore platform with the substructure below the platform top with erect piles and upright legs.
  • Fig. 1 and 20 comprises an offshore platform 1 a substructure 2 (English: base frame) that is deposited on the seabed. 3
  • the substructure 2 forms with piles 4, the foundation structure of the offshore platform 1.
  • the piles 4 (English: pile ), also called “nails” are rammed into the seabed 3 to produce a pile foundation and anchor the substructure 2 on the seabed 3 ,
  • the piles 4 are used for the removal of loads from a platform top 5 ( topside).
  • the piles 4 are preferably circular cylindrical. Preferably, they are hollow cylindrical.
  • the platform top 5 is a support structure which is arranged in the area above the water surface 6 and outside the area of influence of sea state.
  • the platform upper part 5 is supported by legs 7 ( leg ) on the foundation structure.
  • the legs 7 are integrated at the top in each case in the structure of the platform upper part 5 and connected at the bottom with a pile 4.
  • the legs 7 are preferably circular cylindrical. Preferably, they are hollow cylindrical.
  • the substructure 2 has a building structure 8 which comprises a horizontal, rectangular base frame 9.
  • the base frame 9 has four rectilinear frame parts 10.
  • the towers 11 From the frame 9 are four towers 11 upwards.
  • the towers 11 close at the bottom flush with the bottom of the base frame 9.
  • the towers 11 are hollow bodies. In the example, they have an octagonal cross-section.
  • Each tower 11 is located at a corner of the base frame 9 and at the same time forms a connecting element between two adjacent frame parts 10.
  • the frame parts 10 carry above each at the ends of supporting elements 12 which support the towers 11 laterally.
  • the hollow cylindrical towers 11 each have at the lower end a circular, lower opening 13 and at the upper end a circular upper opening 14 for the passage of a pile 4th
  • Each tower 11 comprises a sleeve-shaped lower bearing 15 adjoining the lower opening 13 and a sleeve-shaped upper bearing 16 adjoining the upper opening 14.
  • the lower bearing 15 has a pressure seal 17 for sealing the lower bearing 16 with respect to the pile 4.
  • the lower structure 8 of the base frame 9 and towers 11 is a shipbuilding steel construction of plates and profiles.
  • the plates and profiles are welded together.
  • a plurality of separate tanks 18 are present inside the lower structure 8 .
  • a separate tank 18 is arranged inside the lower structure 8 .
  • the tanks 18 are each connected to flooding means 19 and lending means 20, through which each tank can be separately flooded and drained.
  • the means for flooding 19 are suitable valves.
  • the means for lending 20 are removable pumps with associated conduits.
  • each tower 11 around the pile 4 around a laterally and bottom sealed cavity is present when the pile 4 is held in the lower and upper bearings 15, 16.
  • the cavity forms a further tank 21.
  • This is in turn via separate further means for flooding 22 in the form of Valves and other means of Lenzen 23 in the form of pumps and associated lines separately floodable and lenzbar.
  • Fig. 6 and 8th means for fixing and braking 24 of a pile 4 in a vertical position in each tower.
  • This may be a mechanical or hydraulic device which holds the piles in position in a force-locking or positive-locking manner.
  • Fig. 8 These are clamping jaws 25, 26 which rest on a horizontal bearing 27 and enclose a pile 4 on different sides. By contraction of the jaws 25, 26 of the pile 4 is fixed, so that it does not shift due to its own weight relative to the tower down. By loosening the braking device, the piles 4 can be drained controlled.
  • the tanks 18, 21 are dimensioned so that they ensure the buoyancy for the blurring of the substructure 2 including the piles 4 in the empty state.
  • the substructure 2 is self-swimming and has a stable floating position. It has no own drive.
  • Fig. 2 is on at least one tower 11 above a helm 28 available.
  • the means for flooding 19 are connected to means 29 for controlling the means for flooding in the control station 28.
  • measuring and display devices 30, 31 for detecting and displaying the trim position of the structure 8 are present in the control station.
  • the substructure comprises a vertical cable tower 32, which is formed from a bundle of individual tubes 33.
  • the cable tower 32 is outside the Frame 9 is arranged. It is connected by struts 34 laterally with a tower 11.
  • the base frame 9 is provided with a prismatic buoyant body 35 in the adjacent corner.
  • the buoyant body 35 at the same time stabilizes the base frame 9.
  • the height of the towers 11 is tuned to the water level to the installation site, so that the upper ends of the towers 11 protrude out of the water at the time of installation of the offshore platform 1.
  • the length of the frame is 47.5 meters and its width on the main deck 41.5 meters.
  • the substructure is designed for a place of installation with a lowest astronomical tide ( LAT) of 24 meters.
  • LAT lowest astronomical tide
  • the height of the towers 11 is 25.5 meters, so that the towers 11 are at the place of installation at certain times in normal sea conditions, for example, in moderately moving sea (Seegangspark 4), out of the water.
  • the cable tower 32 is dimensioned such that it projects up to the platform upper part 5. In the example, its length is 40 meters.
  • the piles 4 are hollow cylindrical. Below, they are preferably closed during transport and are opened for ramming down. According to Fig. 16 to 18 have the piles 4 above an opening 35 into which a leg 5 is inserted.
  • the substructure 2 is produced in a building dock of a shipyard.
  • the equipment including the flooding and lashing means (19, 20, 21, 22) and optionally the piles 4 are installed in the substructure 2.
  • the piles 4 can easily be used in the building dock by means of a (portal) crane in the lower and upper bearings 15, 16 of the towers 11 and fixed in a starting position by means of the jaws 25, 26 in which they do not protrude below the base frame 9 ,
  • the cable tower 32 is mounted in the building dock.
  • the substructure 2 After complete assembly of all components, the substructure 2 is floated in the building dock and taken to the equipment pier for final equipment and testing. After construction clearance of the transit of the substructure 2 to the installation site in towed, with appropriate temporary firing.
  • the swimming state is in Fig. 9 shown.
  • the seabed 3 is prepared before setting up the substructure 2 if it has too large irregularities.
  • a flat surface is created on the seabed 3, which meets the defined tolerances for the installation of the offshore platform 2 and forms a suitable substrate for the substructure 2.
  • the substructure 2 is positioned by sea tugs on the installation site.
  • the tractors can be automatically held in a predetermined position by means of a dynamic positioning system.
  • the DP2 system can be used.
  • the flooding of the tanks 18, 21 takes place manually via the control station 28 of the substructure in accordance with the trim position indicated by the display device 31.
  • the tanks 18, 21 can be flooded remotely.
  • the trim layer is monitored by the measuring devices 30 on the substructure 2 and, where appropriate, the measurement results are transmitted to a location outside the substructure 2, from which the flood is remotely controlled.
  • the piles 4 are lowered by gravity.
  • the jaws 25, 26 are controlled for this purpose from the control station 28.
  • the lowering of the piles 4 is braked by means of the jaws 25, 26.
  • the piles 4 penetrate only partially into the seabed 3.
  • they are driven with piles in the subsoil 3, which are placed on top of the piles.
  • the storage of the piles 4 in the towers 11 serves to guide the piles 4 during piling.
  • the piles 4 are driven into the seabed 3 until their upper end is flush with the upper end of the towers 11. This is in Fig. 10 shown.
  • the piles 4 are positively connected to the substructure 2.
  • the positive connection is preferably by Vergrouten.
  • liquid concrete or synthetic resin or another hardening, compressible mass is pressed into a gap 36 between the post 4 and the lower bearing 16.
  • the lower bearing 15 is also provided with an upper seal 37 which, together with the pressure seal 17 prevents the Groutungsstoff 38 from the gap 36th exit.
  • the platform upper part 5 has an upper structure 39, which has a box-shaped middle part 40 and above the waterline 41, ie the swimming water line of the platform upper part 5, overhangs 42, 43.
  • the side walls 44, 45 of the upper structure 39 are thus engaged below the overhangs 42, 43.
  • the building 39 has a symmetrical T-shaped cross-section (see. Fig. 12 ), wherein the central part 40 the vertical T-pillar and the overhangs 42, 43 form the laterally projecting beam parts of the horizontal T-beam.
  • the middle part 40 is according to Fig. 13 closed off to the overhangs 42, 43. Below it has a double bottom 46 and above it is closed by a main deck 47. It contains one or more buoyancy cells 48 which are separated by transverse bulkheads.
  • lateral overhangs 42, 43 are means for storing 49 of the legs 7.
  • a lower leg bearing 50 and an upper leg bearing 51 are present, which are aligned.
  • the lower leg support 50 is disposed in a bottom wall 52 of the overhang 42, 43 and the upper leg support 51 is disposed in a top wall 53 of the overhang 42, 43, which is a lateral strip of the main deck 47 of the platform top 5.
  • the bottom wall 52 and the top wall 53 of the overhangs 42, 43 face the lower and upper leg bearings 50, 51 Reinforcements on.
  • the lower and upper leg bearings 50, 51 are circular through holes through the bottom wall 52 and the top wall 53 at the reinforced locations.
  • the upper structure 39 is also substantially symmetrical in the longitudinal direction.
  • each upper leg bearing 51 there is a lifting device 54 (English: jacking system ), which in FIGS. 14 and 15 is shown in detail.
  • the lifting device 54 has a permanently fixed on deck fixed glasses 55. This is a plate with a vertical through hole 56 through which a leg 7 can be passed. Further, the fixed eyeglasses 55 has a horizontal hole 57 extending from an outer side of the fixed eyeglasses 55 to the inner periphery of the vertical through-hole 56.
  • the lifting device 54 comprises a displaceable goggle 58.
  • This is also a plate with a vertical through hole 59 which receives a leg 7.
  • the displaceable eyeglasses 58 also have a horizontal hole 60 extending from an outer side of the displaceable eyeglasses 58 to the inner periphery of the vertical through-hole 59.
  • the lifting device 54 hydraulic cylinder 61 which are fixed to the bottom of the fixed glasses 55 and the top of the movable glasses 58.
  • the hydraulic cylinder 61 By means of the hydraulic cylinder 61, the displaceable glasses 58 can be raised or lowered vertically.
  • the hydraulic cylinders 61 include a hydraulic control and a supply of hydraulic medium under pressure.
  • the legs 7 are each provided with a series of horizontal blind holes 62.
  • the leg 7 is locked by inserting a bolt 63 in the horizontal hole 57 of the fixed eyeglasses 55 and in a horizontal blind hole 62 of the leg 7 on the platform top 5, so that it does not in the axial direction is relocatable.
  • the lifting device 54 is a pin in the hole system (English: pin in hole system ).
  • a strand jack system (English: beach jacking system ) can be provided.
  • the buoyancy cells 48 are dimensioned so that the upper structure 39 is self-floating when the legs 7 are stored in the means 49 for supporting the legs and fixed by means of the lifting devices 54. In this case, the waterline 41 is below the overhangs 42, 43.
  • the platform top 5 is designed to have a stable floating position when the legs 7 are inserted into the lower and upper leg bearings 50, 51 and do not project beyond the overhangs 42, 43 at the bottom.
  • the width of the waterline 41 of the upper structure 39 is designed so that it can be dispensed with the inclusion of ballast during blurring of the upper structure 39.
  • the weight distribution of the platform upper part 5 is approximately homogeneous. Therefore, it is not necessary to use trim tanks to keep the platform top 5 in a stable trim position. If necessary, trim tanks can also be used.
  • the platform top 5 is self-floating and has no own drive. A transport on a barge is not required.
  • the platform top has a length of 73m, a width on the main deck of 49.5m, below a width of 31.5m and a height from the bottom edge to the deck of 26.5m.
  • Fig. 16 to 17 exceeds the diameter of the legs 7 at a short distance from its lower end, the inner diameter of the upper opening 35 of the piles 4.
  • the legs 7 each have a shoulder 64 under which their outer diameter is smaller by a certain amount than the inner diameter of the piles 4.
  • the legs 7 have a frusto-conical portion 65.
  • the leg 7 With the frusto-conical portion 65, the leg 7 is easily inserted into the upper opening 35 of a pile 4 until the shoulder 64 is seated on the upper edge of the pile 4. Between the reduced diameter portion of the leg and the post, a hollow cylindrical gap 65 remains.
  • the length of the legs 7 is about 45m.
  • the platform top 5 can be built in a building dock of a shipyard.
  • the legs 7 are inserted into the lower and upper leg bearings 50, 51 by means of a (gantry) crane and secured in the lower goggles 55 by means of bolts 63.
  • the platform top 5 is floated at the site and taken to the shipyard pier for final equipment and testing. In this case, the installation of the removable components of the lifting device 54 on the main deck 47 can take place.
  • the platform shell 5 is blurred in towed with appropriate temporary firing to the installation.
  • the platform upper part 5 is floated over the substructure 2 and positioned by guide or fender on the substructure 2 at the defined time according to water level analysis with tractor assistance.
  • the substructure 2 can be used as insertion and positioning aid.
  • the legs 7 are lowered by means of the lifting devices 54 on the piles 4, so that the legs 7 engage with the lower ends in the upper openings 35 of the piles 4 and put on with the paragraphs 64.
  • the lowering takes place by means of the lifting devices 54 in the form that the hydraulic cylinders 61 are moved apart and the horizontal hole 60 of the displaceable glasses 58 is aligned with a blind hole 62 of a leg 7.
  • a bolt 63 is inserted into the horizontal hole 60 and the blind hole 62 and the bolt 63 pulled out of the fixed glasses 55.
  • the hydraulic cylinders 61 are moved together, whereby the legs 7 are lowered. They have been lowered until a blind hole 62 of the leg 7 is aligned with the horizontal hole 57 of the fixed eyeglasses 55. Thereafter, the legs 7 are each secured by means of a bolt which is inserted into the horizontal hole 57 of the fixed eyeglasses 55 and the blind hole 62 of the leg 7. Subsequently, the bolt 63 is pulled out of the displaceable glasses 58 and the above-described processes are repeated until the legs 7 reach their final position.
  • legs 7 according to Fig. 18 engage in the piles 4, they are positively connected to the piles.
  • they are preferably vergroutet with the piles by a Groutstoff 67 is introduced into the gap 66.
  • the platform top 5 is raised to the predetermined installation height.
  • the installation height is selected so that the highest possible wave ("century wave") to be expected according to the water level analysis at the installation site still passes under the platform upper part.
  • the installation height is 161m above LAT.
  • Fig. 1 the finished offshore platform 1 is shown.
  • the cable tower 32 extends up to a lateral overhang 42.
  • a bridge 68 is additionally attached, can be transferred via the submarine cable in the platform top 5 and facilitates installation work.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
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EP12000732.3A 2012-02-03 2012-02-03 Partie supérieure d'une plateforme offshore et procédé d'installation d'une telle partie supérieure d'une plateforme Withdrawn EP2623675A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12000732.3A EP2623675A1 (fr) 2012-02-03 2012-02-03 Partie supérieure d'une plateforme offshore et procédé d'installation d'une telle partie supérieure d'une plateforme
US13/757,072 US20130220203A1 (en) 2012-02-03 2013-02-01 Platform Topside for an Offshore Platform and Method for Installing Such a Platform Topside
KR1020130012316A KR20130090381A (ko) 2012-02-03 2013-02-04 근해 플랫폼용 플랫폼 상측부 및 이러한 플랫폼 상측부를 설치하는 방법

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Application Number Priority Date Filing Date Title
EP12000732.3A EP2623675A1 (fr) 2012-02-03 2012-02-03 Partie supérieure d'une plateforme offshore et procédé d'installation d'une telle partie supérieure d'une plateforme

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EP2623675A1 true EP2623675A1 (fr) 2013-08-07

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EP12000732.3A Withdrawn EP2623675A1 (fr) 2012-02-03 2012-02-03 Partie supérieure d'une plateforme offshore et procédé d'installation d'une telle partie supérieure d'une plateforme

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US (1) US20130220203A1 (fr)
EP (1) EP2623675A1 (fr)
KR (1) KR20130090381A (fr)

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