CN108677995B - Offshore wind turbine single pile foundation with suction caisson and tensioning mooring system - Google Patents
Offshore wind turbine single pile foundation with suction caisson and tensioning mooring system Download PDFInfo
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- CN108677995B CN108677995B CN201810800386.2A CN201810800386A CN108677995B CN 108677995 B CN108677995 B CN 108677995B CN 201810800386 A CN201810800386 A CN 201810800386A CN 108677995 B CN108677995 B CN 108677995B
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- 238000004873 anchoring Methods 0.000 claims abstract description 24
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 230000035515 penetration Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 5
- 239000002689 soil Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- 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
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Wind Motors (AREA)
- Foundations (AREA)
Abstract
The invention discloses a single pile foundation of an offshore wind turbine with a suction caisson and a tensioning mooring system, which comprises a single pile foundation, wherein the single pile foundation is provided with the suction caisson and the tensioning mooring system; the main body of the suction caisson is of an annular structure, an axial penetrating shaft hole is formed in the middle position of the annular structure, the suction caisson is sleeved on the single pile foundation through the shaft hole, the inner wall of the shaft hole is connected with the outer surface of the single pile foundation through a grouting connecting section, and a plurality of reinforcing rib plates are arranged between the inner wall and the outer wall of the suction caisson; the tensioning mooring system comprises a mooring line point positioned on the single pile foundation and at least two anchoring foundations arranged on the seabed around the single pile foundation, wherein the anchoring foundations are connected with the mooring line point through anchor lines. According to the invention, the annular suction caisson foundation is arranged at the joint of the single pile foundation and the seabed to increase the rigidity of the single pile foundation at the seabed, and the horizontal displacement and the dynamic response of the single pile foundation are controlled through the tensioning mooring system.
Description
Technical Field
The invention relates to the field of offshore wind turbine foundation systems, in particular to an offshore wind turbine single pile foundation with a suction caisson and a tensioning mooring system.
Background
With the rapid development of the global wind power industry and the maturation of the onshore wind power development technology, the accelerated development of offshore wind power is a main development trend of the current wind power market. Compared with land wind energy, the marine wind energy has the advantages of high quality, stability and low interference degree. However, due to the specificity of the marine environment, there is still a certain gap between the development speed and the scale of the offshore wind power compared with that of the onshore wind power. Mainly because the equipment required by the development of the offshore wind power is more complex than that of the onshore wind power, the offshore installation cost is high, the relevant equipment of the offshore wind power is developed and improved, the cost is reduced, and the improvement of the construction process has important significance for the development of the offshore wind power.
As the main development equipment of the offshore wind power, one of the main investment of the offshore wind turbine is about 1/5 of the total cost on the basis of the offshore wind turbine, and the stability and the economy of the offshore wind turbine are directly determined by the selection of the basis of the offshore wind turbine. According to the working water depths of the offshore wind turbines, the wind turbine foundations are selected differently. From shallow water to deep water, foundations can be divided into gravity foundations (< 20 m), single pile foundations (20 m-40 m), tripod foundations (30 m-50 m), jacket foundations (30 m-50 m), suction barrel foundations, anchoring foundations (> 50 m) and the like. Wherein currently about 75% of offshore wind turbines worldwide use a mono-pile foundation. The single pile foundation is a large-diameter steel pipe pile with the diameter of 4-6m, and the burial depth is 20-40m according to geological conditions, water depth and the like. Compared with other fan foundation forms, the single pile foundation structure is simple and convenient to install, and the process is simple and economical, so that the single pile foundation structure is widely applied.
However, because the bending rigidity of the pile foundation is smaller when the pile foundation is mainly subjected to horizontal wind and wave load, the upper displacement of the pile foundation is overlarge, and the dynamic response is larger. Especially in the special cases of insufficient soil intensity at the upper part of the seabed and thicker silt layers, the problems of capsizing caused by insufficient stability, instability caused by larger displacement of the pile body and the like can exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the offshore wind turbine single pile foundation which adopts the annular suction caisson and the tensioning mooring system as the auxiliary, and solves the problems of insufficient horizontal bearing capacity, large horizontal displacement, poor bending resistance and large power response of the existing single pile foundation by combining the offshore tensioning anchoring system, the ocean anchoring foundation and the suction caisson foundation which are mature in the prior art. The combined foundation is simple and economical to construct, expands the applicable water depth range of the single pile foundation, and is particularly suitable for offshore fans under special soil conditions of insufficient strength of the soil body at the upper part of the seabed and thicker silt layers.
The technical problems solved by the invention can be realized by adopting the following technical scheme:
an offshore wind turbine single pile foundation with a suction caisson and a tensioning mooring system comprises a single pile foundation, wherein the suction caisson and the tensioning mooring system are arranged on the single pile foundation;
the main body of the suction caisson is of an annular structure, an axial penetrating shaft hole is formed in the middle position of the annular structure, the suction caisson is sleeved on the single pile foundation through the shaft hole, the inner wall of the shaft hole is connected with the outer surface of the single pile foundation through a grouting connecting section, and a plurality of reinforcing rib plates are arranged between the inner wall and the outer wall of the suction caisson;
the tensioning mooring system comprises a mooring line point positioned on the single pile foundation and at least two anchoring foundations arranged on the seabed around the single pile foundation, wherein the anchoring foundations are connected with the mooring line point on the single pile foundation through anchor lines and tensioned.
The distance between the inner wall of the shaft hole and the outer surface of the single pile foundation is 1.5 times of the wall thickness of the single pile foundation.
The reinforced rib plates are distributed from the top of the suction caisson to the bottom of the suction caisson, and the distribution density of the reinforced rib plates at 1/3 part of the top of the suction caisson is larger than that of the reinforced rib plates at 2/3 part of the bottom of the suction caisson.
The suction caisson is provided with a negative pressure press assembly which comprises a negative pressure device arranged at the top and a water pumping hole, and after the negative pressure press assembly of the suction caisson is finished, 1/3 of the top of the suction caisson is higher than the seabed.
One end of the anchor line is connected with a mooring line point on the single pile foundation, the other end of the anchor line is connected with an anchor foundation in the seabed, the anchor line is in a tensioning state, and the angle between the anchor line and the horizontal plane is 30-60 degrees; the anchor lines are even in number and symmetrically and uniformly arranged around the single pile foundation.
The anchoring foundation comprises a suction anchor, a suction penetration plate anchor, a normal bearing anchor and a power penetration anchor.
The construction steps of the offshore wind turbine single pile foundation are as follows:
1) Placing the suction caisson on a seabed, and then enabling a main body of the single pile foundation to penetrate through a shaft hole of the suction caisson;
2) Installing the single pile foundation to a designated depth, and connecting the shaft hole of the suction caisson with the outer surface of the single pile foundation through a grouting process;
3) Installing the suction caisson to the designed height through a negative pressure press-fitting assembly of the suction caisson;
4) And arranging an anchoring foundation on the seabed around the single pile foundation, and connecting and tensioning the anchoring foundation with a mooring rope point on the single pile foundation through an anchor line.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention combines the advantages of the suction caisson foundation, the deepwater anchoring system, the ocean anchoring foundation and the single pile foundation to form a novel foundation type; the auxiliary installation of the suction caisson foundation increases the anti-capsizing capability of the single pile foundation at the seabed; the tensioning type anchoring system is used as an auxiliary to increase the usable water depth of the single pile foundation; meanwhile, the problem of cost rise caused by the increase of the wall thickness diameter of a single pile foundation which is required to be adopted due to the use of a high-capacity offshore wind turbine is solved; .
2. The invention transmits the unidirectional load received on the single pile foundation to the anchoring foundation by the aid of the tensioning anchoring system, improves the stability of the single pile foundation, increases the bending resistance and bearing capacity of the single pile foundation, and reduces the horizontal displacement and dynamic response of the single pile foundation.
3. The invention enables the single pile foundation to be used for the offshore wind turbine in the sea area with the water depth of more than 40 meters, and provides more economic and effective selection for the foundation form of the offshore wind turbine in the water area of 40 meters to 60 meters; the method is particularly suitable for the offshore wind turbine under the special soil condition that the strength of the soil body at the upper part of the seabed is insufficient and the silt layer is thicker.
4. The tensioning type anchoring system and the annular suction caisson adopted in the invention have simple construction process, convenient offshore installation and economy and reliability.
Drawings
Fig. 1 is a side view of a single pile foundation of an offshore wind turbine according to the present invention.
Fig. 2 is a top view of the offshore wind turbine single pile foundation according to the present invention.
Fig. 3 is a schematic view of the seabed location installation of the offshore wind turbine single pile foundation according to the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Referring to fig. 1, 2 and 3, the offshore wind turbine single pile foundation with the suction caisson and the tensioning mooring system comprises a single pile foundation 1, wherein the suction caisson 2 and the tensioning mooring system are arranged on the single pile foundation 1;
the main body of the suction caisson 2 is of an annular structure, an axial penetrating shaft hole is formed in the middle of the annular structure, the suction caisson 2 is sleeved on the single pile foundation 1 through the shaft hole, the inner wall of the shaft hole is connected with the outer surface of the single pile foundation 1 through a grouting connecting section 3, and a plurality of reinforcing rib plates 6 are arranged between the inner wall and the outer wall of the suction caisson 2;
the tensioning mooring system comprises a mooring line point on the monopile foundation 1 and at least two anchoring foundations 5 arranged on the seabed around the monopile foundation 1, wherein the anchoring foundations 5 are connected with the mooring line point on the monopile foundation 1 through anchor lines 4 and are tensioned.
The distance between the inner wall of the shaft hole and the outer surface of the single pile foundation 1 is 1.5 times of the wall thickness of the single pile foundation 1.
The reinforced rib plates 6 are distributed from the top of the suction caisson 2 to the bottom of the suction caisson 2, and the distribution density of the reinforced rib plates 6 at the 1/3 part of the top of the suction caisson 2 is larger than that of the reinforced rib plates 6 at the 2/3 part of the bottom of the suction caisson 2.
The suction caisson 2 is provided with a negative pressure press-fitting assembly, and comprises a negative pressure device and a water pumping hole which are arranged at the top, wherein after the negative pressure press-fitting of the suction caisson 2 is finished, 1/3 of the top of the suction caisson 2 is higher than the seabed.
One end of the anchor line 4 is connected with a mooring point on the single pile foundation 1, the other end of the anchor line 4 is connected with an anchor foundation 5 in the seabed, the anchor line 4 is in a tensioning state, and the angle between the anchor line 4 and the horizontal plane is 30-60 degrees; the anchor lines 2 are even in number and symmetrically and uniformly arranged around the single pile foundation 1.
The anchoring foundation 5 includes suction anchors, suction penetration plate anchors, normal force bearing anchors, and power penetration anchors.
The construction steps of the offshore wind turbine single pile foundation are as follows:
1) Placing the suction caisson 2 on a seabed, and then enabling the main body of the single pile foundation 1 to penetrate through the shaft hole of the suction caisson 2;
2) Installing the single pile foundation 1 to a designated depth, and connecting the shaft hole of the suction caisson 2 with the outer surface of the single pile foundation 1 through a grouting process;
3) Installing the suction caisson 2 to the designed height through a negative pressure press-fitting assembly of the suction caisson 2;
4) An anchor foundation 4 is arranged on the seabed around the single pile foundation 1, and the anchor foundation 5 is connected and tensioned with a mooring line point on the single pile foundation 1 through an anchor line 4.
According to the invention, the annular suction caisson foundation is arranged at the joint of the single pile foundation and the seabed to increase the rigidity of the single pile foundation at the seabed, and the horizontal displacement and dynamic response of the single pile foundation are controlled through the tensioning mooring system, so that the problems of insufficient bending resistance and horizontal bearing capacity of the single pile foundation of the offshore wind turbine are solved, the stability of the single pile foundation is increased, and the method is suitable for seabed conditions with smaller soil body strength of shallow seabed or thicker silt layer.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. An offshore wind turbine single pile foundation with a suction caisson and a tensioning mooring system, which comprises a single pile foundation (1), and is characterized in that the single pile foundation (1) is provided with the suction caisson (2) and the tensioning mooring system;
the main body of the suction caisson (2) is of an annular structure, an axial penetrating shaft hole is formed in the middle of the annular structure, the suction caisson (2) is sleeved on the single pile foundation (1) through the shaft hole, the inner wall of the shaft hole is connected with the outer surface of the single pile foundation (1) through a grouting connecting section (3), and a plurality of reinforcing rib plates (6) are arranged between the inner wall and the outer wall of the suction caisson (2);
the tensioning mooring system comprises a mooring line point positioned on the single pile foundation (1) and at least two anchoring foundations (5) arranged on the seabed around the single pile foundation (1), wherein the anchoring foundations (5) are connected with the mooring line point on the single pile foundation (1) through anchor lines (4) and tensioned;
one end of the anchor line (4) is connected with a mooring point on the single pile foundation (1), the other end of the anchor line (4) is connected with an anchor foundation (5) in the seabed, the anchor line (4) is in a tensioning state, and the angle between the anchor line (4) and the horizontal plane is 30-60 degrees; the number of anchor lines (2) is even and symmetrically and uniformly arranged around the single pile foundation (1);
the anchoring foundation (5) comprises a suction anchor, a suction penetration plate anchor, a normal bearing anchor and a power penetration anchor;
the reinforced rib plates (6) are distributed from the top of the suction caisson (2) to the bottom of the suction caisson (2), and the distribution density of the reinforced rib plates (6) at the 1/3 part of the top of the suction caisson (2) is larger than that of the reinforced rib plates (6) at the 2/3 part of the bottom of the suction caisson (2).
2. Offshore wind turbine mono-pile foundation with suction caisson and tensioning mooring system according to claim 1, characterized in that the inner wall of the shaft hole is 1.5 times the wall thickness of the mono-pile foundation (1) from the outer surface of the mono-pile foundation (1).
3. Offshore wind turbine mono-pile foundation with suction caisson and tensioning mooring system according to claim 1, characterized in that the suction caisson (2) has a negative pressure assembly comprising a negative pressure device and a water suction hole arranged at the top, and that after the suction caisson (2) has been negative pressure assembled 1/3 of the top of the suction caisson (2) is above the seabed.
4. An offshore wind turbine mono-pile foundation with suction caisson and tension mooring system according to any one of claims 1-3, characterized in that the construction steps of the offshore wind turbine mono-pile foundation are as follows:
1) Placing the suction caisson (2) on a seabed, and then enabling the main body of the single pile foundation (1) to penetrate through the shaft hole of the suction caisson (2);
2) Installing the single pile foundation (1) to a designated depth, and connecting the shaft hole of the suction caisson (2) with the outer surface of the single pile foundation (1) through a grouting process;
3) Installing the suction caisson (2) to the designed height through a negative pressure press-fitting assembly of the suction caisson (2);
4) An anchoring foundation (4) is arranged on the seabed around the single pile foundation (1), and the anchoring foundation (5) is connected and tensioned with a mooring line point on the single pile foundation (1) through an anchor line (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810800386.2A CN108677995B (en) | 2018-07-20 | 2018-07-20 | Offshore wind turbine single pile foundation with suction caisson and tensioning mooring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810800386.2A CN108677995B (en) | 2018-07-20 | 2018-07-20 | Offshore wind turbine single pile foundation with suction caisson and tensioning mooring system |
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| Publication Number | Publication Date |
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| CN108677995A CN108677995A (en) | 2018-10-19 |
| CN108677995B true CN108677995B (en) | 2024-02-27 |
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| CN201810800386.2A Active CN108677995B (en) | 2018-07-20 | 2018-07-20 | Offshore wind turbine single pile foundation with suction caisson and tensioning mooring system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109610499B (en) * | 2018-12-07 | 2022-09-23 | 北京天杉高科风电科技有限责任公司 | Single-pile foundation, offshore wind generating set with single-pile foundation and installation method of offshore wind generating set |
| CN110761192B (en) * | 2019-10-30 | 2021-07-06 | 中铁大桥勘测设计院集团有限公司 | Caisson pile foundation and construction method thereof |
| CN113026803B (en) * | 2019-12-09 | 2023-02-28 | 中国电建集团华东勘测设计研究院有限公司 | Suction bucket-pile foundation composite structure applied to offshore electrical platform and construction method |
| CN115404897A (en) * | 2022-10-08 | 2022-11-29 | 中国电建集团成都勘测设计研究院有限公司 | Construction method of marine composite foundation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768978A (en) * | 2010-01-29 | 2010-07-07 | 天津大学 | At-sea wind generation unit foundation formed by barrel type foundation and mooring rope anchor |
| KR101046648B1 (en) * | 2011-04-04 | 2011-07-05 | (주)대우건설 | Marine wind power generation facility for automatically controlling movements in ultimate loads |
| CN103410677A (en) * | 2013-09-03 | 2013-11-27 | 上海交通大学 | Single-pile fixed vertical shaft wind power generator with suction caisson |
| CN104818727A (en) * | 2015-05-05 | 2015-08-05 | 福建永福工程顾问有限公司 | Single pile and gravity combined offshore wind power foundation |
| CN107119627A (en) * | 2017-04-28 | 2017-09-01 | 中交第四航务工程勘察设计院有限公司 | The Gravity harf structure that a kind of counterfort is combined with caisson |
-
2018
- 2018-07-20 CN CN201810800386.2A patent/CN108677995B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768978A (en) * | 2010-01-29 | 2010-07-07 | 天津大学 | At-sea wind generation unit foundation formed by barrel type foundation and mooring rope anchor |
| KR101046648B1 (en) * | 2011-04-04 | 2011-07-05 | (주)대우건설 | Marine wind power generation facility for automatically controlling movements in ultimate loads |
| CN103410677A (en) * | 2013-09-03 | 2013-11-27 | 上海交通大学 | Single-pile fixed vertical shaft wind power generator with suction caisson |
| CN104818727A (en) * | 2015-05-05 | 2015-08-05 | 福建永福工程顾问有限公司 | Single pile and gravity combined offshore wind power foundation |
| CN107119627A (en) * | 2017-04-28 | 2017-09-01 | 中交第四航务工程勘察设计院有限公司 | The Gravity harf structure that a kind of counterfort is combined with caisson |
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| CN108677995A (en) | 2018-10-19 |
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