CN214401870U - Composite foundation structure of offshore wind power single pile, supporting disc and small suction bucket - Google Patents

Composite foundation structure of offshore wind power single pile, supporting disc and small suction bucket Download PDF

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Publication number
CN214401870U
CN214401870U CN202023182289.3U CN202023182289U CN214401870U CN 214401870 U CN214401870 U CN 214401870U CN 202023182289 U CN202023182289 U CN 202023182289U CN 214401870 U CN214401870 U CN 214401870U
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small
pile
supporting
disc
suction
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吴敬凯
张丙印
于玉贞
刘建平
尹文杰
王翔南
袁玮鸿
郝青硕
方楠
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Tsinghua University
China Three Gorges Corp
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Tsinghua University
China Three Gorges Corp
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Abstract

The utility model discloses a composite foundation structure of an offshore wind power single pile, a supporting disk and a small-sized suction bucket, which comprises a steel pipe pile, the supporting disk and the small-sized suction bucket, wherein the steel pipe pile is fixedly arranged at the central hole part of the supporting disk, and the steel pipe pile and the supporting disk are concentrically arranged; the inside of supporting disk is provided with first floor, the bottom at the supporting disk is fixed to small-size suction bucket equipartition, be provided with the second floor between small-size suction bucket and the supporting disk, the inside packing of supporting disk has throws and fills the rockfill or pours into the concrete. Through the support plate and the small suction barrel, the composite foundation is suitable for a seabed geological environment with a sludge covering layer and has stronger vertical bearing capacity and lateral bearing capacity; the cover weight is increased by throwing and filling rockfill or pouring concrete into the supporting disc, so that the soil body is strengthened, the anti-overturning capability of the foundation is improved, and the scouring of waves to the soil body of the seabed is prevented.

Description

Composite foundation structure of offshore wind power single pile, supporting disc and small suction bucket
Technical Field
The utility model relates to an offshore wind power is foundation structure under water, especially relates to a compound foundation structure of offshore wind power single pile, supporting disk and small-size suction bucket, belongs to geotechnical engineering and ocean engineering field.
Background
Wind energy is a clean renewable energy source. The offshore wind energy resource has the characteristics of large and stable wind speed, abundant energy storage, wide distribution, high power generation output and long service life, and has wide development prospect. At present, the construction of offshore wind power engineering projects is in a high-speed development period, and a single pile is widely accepted by design and construction units as a convenient foundation structure. However, when the thickness of the underwater covering layer is shallow or the foundation on the upper layer of the seabed is soft clay, the pile diameter or the pile length needs to be increased or a rock-socketed pile is adopted to ensure the safety of the foundation, so that the construction cost and the construction difficulty are increased.
The single pile, the supporting disc and the small suction bucket composite foundation structure is an improvement on a single pile foundation, fully combines the advantages of the single pile and the suction bucket, is simple in design and construction, relatively low in cost and capable of improving the vertical and lateral bearing capacity of the foundation. Compared with the single pile and large suction bucket composite foundation (such as patent publication number: CN 107217682A, CN 110016930A), the composite foundation has relatively low cost, the combination can increase the overall stability of the pile foundation, the arrangement of a plurality of small suction buckets makes the construction under the severe ocean working condition more flexible, and is beneficial to the leveling of the overall foundation in the construction process. In addition, a three-barrel jacket-large-diameter single-pile composite foundation of an offshore wind turbine is disclosed in CN 209636843U, but the wind wave resistance and the anti-overturning capacity of the composite foundation are limited.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving relevant technical problem to a certain extent at least. Therefore, the utility model provides a composite foundation structure of offshore wind power single pile, supporting disk and small-sized suction bucket, which makes the composite foundation adapt to seabed geological environment with sludge covering layer and has stronger vertical bearing capacity and lateral bearing capacity through the supporting disk and the small-sized suction bucket; the cover weight is increased by throwing and filling rockfill or pouring concrete into the supporting disc, so that the soil body is strengthened, the anti-overturning capability of the foundation is improved, and the scouring of waves to the soil body of the seabed is prevented.
In order to realize the technical characteristics, the purpose of the utility model is realized as follows: a composite foundation structure of an offshore wind power single pile, a supporting disc and a small suction bucket comprises a steel pipe pile, the supporting disc and the small suction bucket, wherein the steel pipe pile is fixedly arranged at a central hole of the supporting disc, and the steel pipe pile and the supporting disc are concentrically arranged; the inside of supporting disk is provided with first floor, the bottom at the supporting disk is fixed to small-size suction bucket equipartition, be provided with the second floor between small-size suction bucket and the supporting disk, the inside packing of supporting disk has the riprap body or pours into the concrete.
The structural form of the steel pipe pile adopts a single pile structure.
The supporting disc adopts a hollow and non-top-sealing large-diameter disc structure, a central cylinder is arranged at the central hole of the supporting disc, and the bottom end of the central cylinder extends downwards and extends out of the bottom end face of the supporting disc by a section of length.
The first rib plate is in a trapezoidal or rectangular structural form, and two parallel edges of the first rib plate are fixedly connected with the inner wall and the outer wall of the supporting disc respectively.
The first ribbed slab is a plurality of in total to the equipartition sets up in the inside of supporting disk.
The second ribbed plate is in a trapezoidal or rectangular structural form, and two parallel edges of the second ribbed plate are fixedly connected with the outer wall of the small suction barrel and the central cylinder of the supporting disk respectively; the number of the second ribbed plates is the same as that of the small suction buckets.
The small suction barrel adopts a small-diameter circular ring structure, and the opening of the small suction barrel is downward; the top of the small suction barrel is connected with the bottom of the support plate; a suction device is attached to the top of the small suction barrel and is positioned inside the supporting disc; the small-size suction bucket is total a plurality of to the equipartition sets up in the supporting disk bottom.
The diameter of the supporting disc is 25-40 m; the number of the first rib plates in the supporting disc is 3-8; the diameter of the small suction barrels is 6-10 m, and the number of the small suction barrels is 3-6; the filling material of the rockfill is wide-graded loose rockfill; the concrete is made of underwater self-compacting concrete.
The utility model discloses there is following beneficial effect:
1. the utility model discloses the composite foundation structure of single stake, supporting disk and small-size suction bucket that adopts, its structure is simpler, and the design, manufacturing and the transportation degree of difficulty are less, have effectively reduced engineering cost.
2. Construction equipment is roughly the same with the single pile, combines to utilize suction device, and the efficiency of construction is high and the degree of difficulty is little.
3. The steel pipe pile, the supporting disc, the small-sized suction bucket and the rib plate are fixedly connected with each other, and the formed integral structure is high in strength.
4. The friction provided by the supporting disc, the ribbed plate and the small-sized suction bucket can improve the vertical bearing capacity of the foundation to a certain extent.
5. The small-sized suction bucket is embedded into the seabed holding layer, so that the horizontal bearing capacity and the anti-overturning capacity of the foundation can be obviously improved.
6. The supporting disc and the dumped rockfill or poured concrete increase the weight of the foundation cover, strengthen the soil body around the pile, improve the lateral bearing capacity of the foundation and prevent the sea bed soil body from being washed by waves.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a front view of the present invention.
Fig. 2 is a plan view of the present invention.
Figure 3 is a view a-a of figure 1 according to the present invention.
Fig. 4 is a view B-B of fig. 1 according to the present invention.
Fig. 5 is a front view of the inner rib plate of the support plate of the present invention adopting a trapezoidal scheme.
Fig. 6 is a front view of the bottom rib plate of the support plate of the present invention adopting a rectangular scheme.
In the figure: the steel pipe pile comprises a steel pipe pile 1, a support plate 2, a small suction bucket 3, a ribbed plate 4, a ribbed plate 5, a rock-fill body 6, concrete 7, a suction device 8, a sludge covering layer 9 and a holding layer 10.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
Example 1:
referring to fig. 1-6, a composite foundation structure of an offshore wind power single pile, a support disc and a small suction bucket comprises a steel pipe pile 1, a support disc 2 and a small suction bucket 3; the outer wall of the steel pipe pile 1 is connected with the inner wall of the support disc 2, and the support disc 2 and the steel pipe pile 1 are arranged concentrically; a first rib plate 4 is arranged inside the supporting disc 2; the bottom of the support disc 2 is provided with a small suction bucket 3 and a second ribbed plate 5. There are two possible construction methods as follows:
firstly, driving the steel pipe pile 1 to a target depth; then, the supporting disc 2 and the small suction bucket 3 are sleeved into the whole structure from the top of the steel pipe pile 1, and the bottom of the small suction bucket 3 is close to or touches the surface of a sludge layer 9 of a seabed through self weight; embedding the small suction bucket 3 into a holding layer 10 of the seabed to a target depth through a suction device 8; grouting to connect the inner wall of the support disc 2 and the outer wall of the steel pipe pile 1; the support plate 2 is then filled with rock fill 6 or with concrete 7.
Secondly, the small suction bucket 3 firstly passes through a sludge covering layer 9 of the seabed and is embedded into a holding layer 10 of the seabed through a suction device 8; then, driving the steel pipe pile 1 from the middle part of the support disc 2; after piling to a target depth, performing underwater grouting connection on the outer wall of the steel pipe pile 1 and the inner wall of the supporting disc 2; the support plate 2 is then filled with rock fill 6 or with concrete 7.
The composite foundation structure in the utility model combines the advantages of single pile and suction bucket, and can improve the vertical bearing capacity of the foundation through the friction provided by the support plate and the small suction bucket on the premise of not increasing the manufacturing cost greatly; the small-sized suction bucket is embedded into the holding layer, so that the horizontal bearing capacity and the anti-overturning capacity of the foundation can be obviously improved, and the horizontal displacement and the inclination rate of the pile body are obviously reduced.
Further, the structural form of the steel pipe pile 1 adopts a single pile structure. And the cost is reduced by adopting the common steel pipe pile.
Furthermore, the supporting disk 2 adopts a hollow and non-capping large-diameter disk structure, and the inner wall of the disk structure extends downwards. The effect of connecting the steel pipe pile and the small-size suction bucket is exerted, and a platform is provided for increasing the cover weight.
Furthermore, the small-sized suction bucket 3 adopts a small-diameter circular ring structure, and the opening is downward. And a small-diameter circular ring structure is adopted, so that the manufacturing cost cannot be greatly increased.
Example 2:
referring to fig. 1-6, in the present embodiment, a first rib 4 is made inside the support disc 2, which may take the shape of a trapezoid or a rectangle. Two parallel edges of the first ribbed plate 4 are respectively and fixedly connected with the inner wall and the outer wall of the supporting disc 2; the first rib plates 4 are a plurality of and are uniformly distributed in the support disc 2. The first rib plate 4 is adopted, so that the overall strength of the support disc 2 is increased; on the other hand, a plurality of fan-shaped areas are formed inside the supporting disc 2, so that space is provided for arrangement of a suction device, rockfill or concrete pouring.
Furthermore, the diameter of the support disc 2 is 25-40 m. The purpose is to obtain the best pile foundation supporting effect.
Furthermore, the number of the first ribs 4 in the support disc is 3-8. The aim is to obtain an optimum structural strength enhancement effect.
Example 3:
referring to fig. 1-6, in this embodiment, the support plate 2 is fabricated with a small suction bucket 3 and a second rib 5 at the bottom. The top of the small suction barrel 3 is connected with the bottom of the support plate 2; the top of the small suction bucket 3 is attached with a suction device 8, and the suction device 8 is positioned inside the support plate 2. The second ribbed plate 5 can adopt a trapezoid or rectangular form, and two parallel edges of the second ribbed plate 5 are respectively fixedly connected with the inner wall of the supporting plate 2 and the outer wall of the small suction barrel 3, so that the composite foundation is strengthened.
Further, the diameter of the small-sized suction bucket 3 is 6-10 m, and the purpose is to obtain the best pile foundation supporting effect.
Further, the number of the second rib plates 5 at the bottom of the supporting plate and the small suction bucket 3 is kept consistent and is 3-6, and the purpose is to obtain the best structure reinforcing effect and pile foundation supporting effect.
Example 4:
referring to fig. 1-6, in this embodiment, after the construction is performed to the target depth of the steel pipe pile 1 and the small suction bucket 3, rock fill or concrete is poured into the support plate 2, so as to increase the cover weight, strengthen the soil around the pile, improve the lateral bearing capacity of the composite foundation, and effectively prevent the wave from washing the seabed soil.
Example 5:
the composite foundation structure of the offshore wind power single pile, the supporting disc and the small suction bucket has two possible construction methods.
The first method comprises the following steps:
step 1: driving the steel pipe pile 1 to a target depth;
step 2: the supporting disc 2 and the small suction bucket 3 are sleeved into the whole structure from the top of the steel pipe pile 1, and the bottom of the small suction bucket 3 is close to or touches the surface of a sludge layer 9 of a seabed through self weight;
step 3: embedding the small suction bucket 3 into a holding layer 10 of the seabed to a target depth through a suction device 8;
step 4: grouting to connect the inner wall of the support disc 2 and the outer wall of the steel pipe pile 1;
step 5: the support disc 2 is either filled with rock fill 6 or filled with concrete 7.
The second method comprises the following steps:
step 1: sinking the support disc 2 and the small suction bucket 3 into an integral structure through a suction device 8 until the small suction bucket 3 penetrates through a sludge covering layer 9 of the seabed and is embedded into a holding layer 10 of the seabed;
step 2: positioning a piling position, and driving the steel pipe pile 1 from the middle part of the supporting disc 2 until the steel pipe pile is driven to a target depth;
step 3: the outer wall of the steel pipe pile 1 is connected with the inner wall of the supporting disc 2 through underwater grouting;
step 4: the support disc 2 is either filled with rock fill 6 or filled with concrete 7.

Claims (8)

1. The utility model provides a compound foundation structure of marine wind power single pile, supporting disk and small-size suction bucket which characterized in that: the steel pipe pile suction device comprises a steel pipe pile (1), a supporting disc (2) and a small suction barrel (3), wherein the steel pipe pile (1) is fixedly arranged at a central hole part of the supporting disc (2) and keeps concentric arrangement; the inside of supporting disk (2) is provided with first floor (4), the bottom at supporting disk (2) is fixed in small-size suction bucket (3) equipartition, be provided with second floor (5) between small-size suction bucket (3) and supporting disk (2), the inside packing of supporting disk (2) has throws and fills rockfill body (6) or pours into concrete (7).
2. The composite foundation structure of offshore wind power mono-pile, support disc and small suction bucket according to claim 1, characterized in that: the structural form of the steel pipe pile (1) adopts a single pile structure.
3. The composite foundation structure of offshore wind power mono-pile, support disc and small suction bucket according to claim 1, characterized in that: the supporting disc (2) is of a hollow large-diameter disc structure without top sealing, a central cylinder is arranged at the central hole of the supporting disc (2), and the bottom end of the central cylinder extends downwards and extends out of the bottom end face of the supporting disc (2) by a length.
4. The composite foundation structure of offshore wind power mono-pile, support disc and small suction bucket according to claim 1, characterized in that: the first ribbed plate (4) adopts a trapezoidal or rectangular structural form, and two parallel edges of the first ribbed plate (4) are fixedly connected with the inner wall and the outer wall of the supporting disc (2) respectively.
5. The composite foundation structure of offshore wind power mono-pile, support disc and small suction bucket according to claim 1 or 4, characterized in that: the first ribbed plates (4) are a plurality of and are uniformly distributed in the support disc (2).
6. The composite foundation structure of offshore wind power mono-pile, support disc and small suction bucket according to claim 1, characterized in that: the second ribbed plate (5) adopts a trapezoidal or rectangular structural form, and two parallel edges of the second ribbed plate (5) are fixedly connected with the outer wall of the small suction barrel (3) and the central cylinder of the supporting plate (2) respectively; the number of the second ribbed plates (5) is the same as that of the small suction buckets (3).
7. The composite foundation structure of offshore wind power mono-pile, support disc and small suction bucket according to claim 1, characterized in that: the small-sized suction bucket (3) adopts a small-diameter circular ring structure, and the opening of the small-sized suction bucket is downward; the top of the small suction barrel (3) is connected with the bottom of the support plate (2); a suction device (8) is attached to the top of the small suction barrel (3), and the suction device (8) is positioned inside the supporting plate (2); the small-sized suction buckets (3) are multiple in total and are uniformly distributed at the bottom of the supporting disc (2).
8. The composite foundation structure of offshore wind power mono-pile, support disc and small suction bucket according to claim 1, characterized in that: the diameter of the support disc (2) is 25-40 m; the number of the first rib plates (4) in the supporting disc is 3-8; the diameter of the small suction barrels (3) is 6-10 m, and the number of the small suction barrels is 3-6; the filling material of the rockfill body (6) is wide-grade loose rockfill; the concrete (7) is made of underwater self-compacting concrete.
CN202023182289.3U 2020-12-25 2020-12-25 Composite foundation structure of offshore wind power single pile, supporting disc and small suction bucket Active CN214401870U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112627225A (en) * 2020-12-25 2021-04-09 中国长江三峡集团有限公司 Composite foundation structure of offshore wind power single pile, supporting disc and small suction bucket and construction method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112627225A (en) * 2020-12-25 2021-04-09 中国长江三峡集团有限公司 Composite foundation structure of offshore wind power single pile, supporting disc and small suction bucket and construction method thereof

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