EP1402119A1 - Foundation in water - Google Patents
Foundation in waterInfo
- Publication number
- EP1402119A1 EP1402119A1 EP02724355A EP02724355A EP1402119A1 EP 1402119 A1 EP1402119 A1 EP 1402119A1 EP 02724355 A EP02724355 A EP 02724355A EP 02724355 A EP02724355 A EP 02724355A EP 1402119 A1 EP1402119 A1 EP 1402119A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- foundation
- shell
- foundation structure
- shell structure
- soil
- 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.)
- Granted
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
- E02B17/025—Reinforced concrete structures
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
-
- 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
- E02B2017/0065—Monopile structures
-
- 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
- E02B2017/0086—Large footings connecting several legs or serving as a reservoir for the storage of oil or gas
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/1692—Shapes conical or convex
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Definitions
- the invention relates to a foundation structure to be built offshore. More closely defined, the object of the invention is a shell structure of a foundation structure to be built, operating together with the soil inside it.
- a third alternative is to transport to the site or to manufacture on site a massive foundation struc- ture (of steel and/or concrete), onto which a construction, for example a wind power station, to be joined to the foundation structure and extending either partly below the water surface or being totally above the water surface, is installed.
- a construction for example a wind power station
- Such constructions that are disclosed, for example, in the patent specifications U 3 793 840 and US 5 613 808 can be either fixed or movable.
- this alternative is suitable both for a soft and hard bottom. When a different bottom is concerned, the installation only requires slightly different manufacturing procedures for the installation.
- the required bottom work such as for example, the loosening of moraine by exploding that has to be performed now and then may considerably increase the time.
- the fast and even hard changes in weather may interrupt the foundation project, and even force to demobilise and remobilise expensive equipment. If several foundation structures are to be installed to the same area, for example when building a wind park, it is extremely difficult to work out a fixed schedule, and advantages of serial production are lost.
- Concrete caissons are also used as offshore foundation structures. There is a limited number of dockyards used for their building, and their use in connection of other productional activities is expensive and difficult. Also the reservoir to be separately built for the manufacture of caissons is in practice often an expensive and time- consuming solution. Weather and schedule risks are involved in the transport of caissons by floating or by heavy equipment and in the ballasting. The use of the caisson is made more difficult, because it cannot be installed to a very uneven bottom. In addition, the caisson solution in its entirety is expensive.
- the object of the present invention is to avoid the drawbacks mentioned above that are related to expensive foundation solutions, the use of special equipment, and the predictability of schedules.
- serial work in which the time required by expensive marine work operations is short and the schedule risk related with them can be controlled.
- the equipment to be used should be moderately-priced standard equipment.
- Work requiring expensive special equipment, such as the installation of shaft and mill has to be performed as serial work so that one single work stage offshore would preferably last less than 24 hours, in which case the weather risk can be controlled. In this way, the entire wind park could be installed and implemented during one summer.
- a thin shell structure preferably of steel, which is filled with soil after embedding, for example, with natural non-cohesive soil, crushed stone or mixed blasted stone.
- a conical structure located in the water line and a structural braced ring footing form a part of the shell structure.
- the conical structure improves the suitability of the foundation structure for demanding conditions, but in stable ice conditions and on marginal ice areas or iceless areas the shell structure can be a straight cylinder.
- Such a thin shell structure can be lifted and transported to the installation location by using conventional equipment, in which case the costs are considerably reduced.
- the assembling of the thin steel shell requires no extensive investments, but it can be done on quayside or in a workshop near the installation area. Compared with a rock hollow to be done, for example, by exploding, the bottom work required by the foundation structure can be performed fast, at low cost and with moderate tolerance.
- Figure 1 is a cross-section of a foundation structure manufactured of a thin-walled, rotationally symmetrical shell structure
- Figure 2 is a cross-section of a foundation manufactured of a thin-walled, rotationally symmetrical shell structure, in which the conical structure has been inverted,
- Figure 3 presents an embodiment to be used in shallow waters, with the foundation structure cross-sectioned
- Figure 4 presents an embodiment to be used in deep waters on top of a soft bottom layer, with the foundation structure cross-sectioned, and
- Figure 5 presents an embodiment for installing the foundation structure onto rock bottom.
- FIG. 1 shows an advantageous embodiment of the offshore foundation structure of the invention.
- the foundation structure advantageously consists of the rotationally symmetrical shell structure 1 of steel and of the braced ring footing 2 in the plane of foundation, attached to the shell structure.
- the shell structure 1 can also be of some other form besides rotationally symmetrical. For example, it can be a polygon.
- the shell structure 1 contains the conical area 3, with which the dynamic ice loads directed to the structure are reduced, and above all, the intensity of ice induced vibrations is reduced by an order of magnitude. The intensity of vibrations is extremely significant especially if the foundation structure is used as the foundation for a wind power station. Their reduction improves the operation and durability of the wind power station.
- the conical area 3 is located substantially on the level of the water surface 4.
- the conical area 3 improves the suitability of the foundation structure to demanding conditions, but in stable ice conditions and on marginal ice areas or ice- less areas, the shell structure 1 can be a straight cylinder.
- the conical structure 3 is preferably braced with horizontal and/or vertical bracings attached to the surface of the thin shell structure 1 so that the connection plate 6, closing the shell structure partly or entirely from above, can be more firmly connected to the shell structure.
- a braced steel plate or a reinforced concrete plate can preferably be used as the connection plate 6.
- a structure above the water surface 4 such as a wind power station, a fixed navigation mark, a lighthouse, or some other structure, is attached to the foundation structure.
- a shell-structured foundation can also be built without the connection plate 6 so that the structures above the water surface 4 are directly connected to the shell structure 1, for example, by welding.
- the shell-structured 1 foundation can further be used, for example, for quays, dolphins, oil loading structures, oil drilling structures, or as ice-resistant bridge piers.
- the form of the shell structure 1 can also differ from the rotationally symmetrical form.
- the diameter of the shell structure 1 is preferably 4 - 40 m and the thickness preferably 6 - 40 mm. In the water line, also a steel plate with a stronger thickness can be used for reinforcing the structure.
- the structural braced ring footing 2 according to Figure 1 on the plane of foundation ensures the cooperation of the shell structure 1 and the fill 7, consisting pref- erably of soil, in relation to dynamic loadings. Without the ring footing 2 there is the risk that the foundation structure will gradually tilt by the action of the dynamic loadings.
- the ring footing 2 works as an anchorage in relation to dynamic forces.
- the ring footing 2 can be provided with a uniform or segmented skirt/skirts 21, penetrating into the soil.
- the skirt/skirts 21 improve the stability of the foundation structure.
- the installation location Before embedding the shell structure 1 to the installation location, the installation location is levelled with the soil layer 8, when required. Thus, as good a base as possible is produced for the foundation structure to be made.
- soil material 9 is brought outside the shell structure 1 for covering the ring footing 2 for the ex- ternal part of the shell structure 1 for protecting the structure from erosion and for improving stability.
- the conical structure 3 can also be inverted, as in Figure 2, which facilitates the control of wave loads.
- the connection plate 6 By manufacturing the connection plate 6 to have a bigger diameter than the overlying structure to be installed to it, the free area remaining for the connection plate can advantageously be used as an entrance/working plane.
- the building of the foundation structure of the invention begins by preparing the bottom 10 of the installation area. This step can comprise, for example, the transport of soil to the site by barge. The filling of shell by soil is performed by using standard equipment (for example, a combination of barge and bucket loader), and it is thus relatively fast and inexpensive.
- the bottom 10 can be ready for shell placement without any additional measures.
- the thin steel shell 1 can be simultaneously assembled in the vicinity of the water area in a workshop and on quay from prefabricated segments without expensive special preparations.
- the steel shell 1 When the bottom 10 is suitable for installation, the steel shell 1 is transported to site using standard transport equipment, such as a transport barge. No special equipment is needed, because the structure is notably light, compared with the solutions previously used. The steel shell 1 can be lifted from the transport equipment using standard crane equipment, and it is sunk to the bottom 10.
- standard transport equipment such as a transport barge.
- the filling of the steel shell 1 is carried out by using soil 7. It is also preferable to roll soil and blocks along the conical surface to the bottom of the steel structure onto the footing 2 so that, for this part, the soil 9 works as a protection from erosion and increases the total stability of the structure.
- the soil 7 installed inside the steel shell 1 is arching as in a silo, and the entity formed by the shell and the soil operates with certain preconditions almost like a solid block, both in relation to tilting and sliding.
- the soil 7 supports the thin-walled steel shell 1 , thus preventing the loss of stability of the shell under stress, the shell being extremely thin-walled in relation to its diameter. Further, the soil 7 supports the steel shell 1 also in relation to local ice loads and wave impacts.
- the internal filling 7 also efficiently suppresses the vi- brations of the structure. Because of the arching effect of the internal filling 7 of the steel shell 1 it is I possible to use normal piles 12 provided with pile caps 11 for supporting the structure, when building on a soft bottom 10, as is later shown in Figure 4. There is no need for an underwater bedplate in this case, either.
- Figure 3 there is shown an advantageous embodiment for a foundation structure to be made to shallow water.
- the height of the thin steel shell 1 is smaller and the diameter is bigger than those of a foundation structure to be made to deeper water.
- the stability of the structure can be made better in relation to the wind moment exerted from structures above the water.
- the foundation structure to be made to shallow water has a wide conical part 3.
- Figure 4 presents a two-part foundation structure to be made to deep water, consisting of a wider lower part 13 and a narrower upper part 14, which is, for example, similar to the structure shown in Figure 1.
- the two-part solution makes it possible to minimise the use of soil 7 and facilitates the installation to big water depths.
- Figure 4 also shows the piling of a foundation structure to be made with capped piles 12 through soft bottom 10 to the harder bed material 15 below.
- Figure 5 illustrates an installation to be made on uneven rock bottom 16.
- a ring footing 17 of concrete and an internal anchoring of the structure are preferably used; the foundation structure can be attached to the rock with the said anchoring without an expensive rock hollow, which is difficult to realise.
- the shell structure 1 is attached to the rock 16 through the bed casting 19 and the concrete footing 17 levelling the bottom, using groutable rock anchors 18. The stability of the shell structure 1 is at the installation stage ensured by installation bolts 20 to be attached to the concrete footing 17.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Foundations (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20011074A FI20011074A (en) | 2001-05-22 | 2001-05-22 | Foundation in the watershed |
FI20011074 | 2001-05-22 | ||
PCT/FI2002/000442 WO2002095139A1 (en) | 2001-05-22 | 2002-05-22 | Foundation in water |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1402119A1 true EP1402119A1 (en) | 2004-03-31 |
EP1402119B1 EP1402119B1 (en) | 2016-04-27 |
Family
ID=8561249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02724355.9A Expired - Lifetime EP1402119B1 (en) | 2001-05-22 | 2002-05-22 | Foundation in water |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1402119B1 (en) |
DK (1) | DK1402119T3 (en) |
FI (1) | FI20011074A (en) |
WO (1) | WO2002095139A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK1777348T3 (en) * | 2005-10-21 | 2017-08-28 | Dredging Int N V | Apparatus and method for offshore installations |
DK2354535T3 (en) * | 2009-12-29 | 2012-08-27 | Kyowa Co Ltd | Method of constructing a foundation for a wind power generation system |
WO2012130291A1 (en) * | 2011-03-29 | 2012-10-04 | Amsc Windtec Gmbh | Offshore foundation structure with hull for wind turbines |
RU2488660C1 (en) * | 2011-11-16 | 2013-07-27 | Веллгип Ой | Support structure of marine complex, support and method of support structure assembly |
US9121155B2 (en) * | 2012-09-24 | 2015-09-01 | Keppel Offshore & Marine Technology Centre Pte Ltd | Ice resistant jackup leg |
WO2020046615A1 (en) | 2018-08-30 | 2020-03-05 | Exxonmobil Upstream Research Company | Integrated pile anchor reinforcement systems |
WO2020046614A1 (en) * | 2018-08-30 | 2020-03-05 | Exxonmobil Upstream Research Company | Pile anchor reinforcement systems |
EP3879035A1 (en) | 2020-03-13 | 2021-09-15 | Pori Offshore Constructions Oy | Marine foundation, arrangement, use of a marine foundation and method of installing and de-installing a marine foundation |
CN114622599A (en) * | 2022-02-23 | 2022-06-14 | 中国船级社 | Workstation for seabed long-term scientific investigation |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3117423A (en) * | 1959-02-09 | 1964-01-14 | Gasaccumulator Svenska Ab | Method for the production of underwater foundations |
US3824795A (en) * | 1971-03-16 | 1974-07-23 | Mo Och Domsjoe Ab | Platform structure |
CA1230745A (en) * | 1978-03-29 | 1987-12-29 | James C. Pearce | Arctic multi-angle conical structure |
NO175220C (en) * | 1992-04-22 | 1994-09-14 | Norske Stats Oljeselskap | Foundation for offshore platform |
US5316413A (en) * | 1992-09-28 | 1994-05-31 | Chevron Research And Technology Company | Offshore double cone structure |
-
2001
- 2001-05-22 FI FI20011074A patent/FI20011074A/en not_active Application Discontinuation
-
2002
- 2002-05-22 WO PCT/FI2002/000442 patent/WO2002095139A1/en not_active Application Discontinuation
- 2002-05-22 DK DK02724355.9T patent/DK1402119T3/en active
- 2002-05-22 EP EP02724355.9A patent/EP1402119B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO02095139A1 * |
Also Published As
Publication number | Publication date |
---|---|
FI20011074A0 (en) | 2001-05-22 |
FI20011074A (en) | 2002-11-23 |
DK1402119T3 (en) | 2016-08-15 |
EP1402119B1 (en) | 2016-04-27 |
WO2002095139A1 (en) | 2002-11-28 |
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