CN211172055U - Offshore single-pile foundation with sand pile reinforced foundation - Google Patents
Offshore single-pile foundation with sand pile reinforced foundation Download PDFInfo
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- CN211172055U CN211172055U CN201921367985.6U CN201921367985U CN211172055U CN 211172055 U CN211172055 U CN 211172055U CN 201921367985 U CN201921367985 U CN 201921367985U CN 211172055 U CN211172055 U CN 211172055U
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Abstract
The utility model relates to an offshore single pile foundation with sand pile reinforced foundation in the field of pile foundation of ocean engineering, the technical scheme is that a steel pipe pile is sunk into the seabed, the seabed is a soft soil foundation, a reinforced foundation of sand pile technology is adopted in the local area of the soft soil foundation, the steel pipe pile is inserted into and passes through the reinforced foundation to be sunk into the soft soil foundation, and the reinforced foundation comprises the sand pile and the soft soil between the sand piles; the sand piles are uniformly arranged at intervals; the central longitudinal axis of the reinforced foundation is consistent with the central longitudinal axis of the steel pipe pile. The sand pile comprises a compacted sand pile. The wind power generator has the characteristics of high horizontal bearing capacity, small horizontal displacement of a pile top, small inclination angle of a pile body and high foundation rigidity, is suitable for the characteristics of large horizontal load of an offshore wind turbine, meets the strict requirements of the offshore wind turbine on the horizontal displacement of the foundation and the inclination angle of the pile body, and meets the requirements of the integral natural vibration frequency of a structure and the foundation.
Description
Technical Field
The utility model relates to a pile foundation field of ocean engineering especially relates to a marine single pile basis that horizontal bearing capacity in soft soil foundation is high.
Background
Offshore wind power generation is the key point of new energy field development, and the market prospect is very wide. The fan unit has strict control standards for horizontal displacement and uneven settlement of a foundation, and the self-vibration frequency of the structure and the foundation needs to avoid the driving frequency of an external load. At present, common foundation types of offshore wind generating sets include single piles, high pile caps, multi-foot stands, pipe racks, gravity type, negative pressure bucket type, floating platform structures and the like. In offshore wind power projects, single-pile foundations are widely adopted, and have the advantages of small occupied area, simple structure, quick construction, low construction cost and the like; on the other hand, however, monopile foundations have the disadvantage of being less rigid and structurally flexible than other foundation types. The sea bed surface layer of offshore sea areas in China is mostly deep soft soil, and the application of the type foundation is restricted to a certain extent. In a complex marine environment, waves, ocean currents and the like can apply huge horizontal loads to the fan foundation; along with the fan single machine capacity is larger and larger, the hub height is higher and higher, the blade is longer and longer, and the fan load is larger and larger. Although the steel pipe pile has high bending rigidity, the soil body on the surface layer of the foundation around the pile can provide limited horizontal constraint. If a conventional single-pile foundation is adopted, the method of increasing the pile diameter, the pile length or the wall thickness can cause more material consumption, and the increase of the weight of the single pile also brings higher construction difficulty, so that the construction cost of the foundation is rapidly increased, and the power generation benefit of a wind power plant is influenced. Therefore, the research and development of the offshore single-pile foundation with high horizontal bearing performance in the soft soil foundation have practical engineering significance.
SUMMERY OF THE UTILITY MODEL
In view of the difficult point that single pile foundation was used in soft soil foundation sea area, the utility model aims to provide a marine single pile foundation with sand pile consolidates ground, its level bears the weight of the dynamic height, pile bolck horizontal displacement is little, pile body inclination is little, foundation rigidity is big, adapts to the characteristics that offshore wind turbine horizontal load is big, satisfies the strict requirement of offshore wind turbine to basic horizontal displacement and pile body inclination, satisfies the requirement of "structure + basis" whole self-oscillation frequency.
The technical scheme of the utility model is that: a single pile foundation with sand pile reinforced foundation at sea and high bearing capacity comprises a steel pipe pile sunk into the sea bed, wherein the sea bed is a soft soil foundation, and the single pile foundation also comprises a reinforced foundation formed by adopting a sand pile process in a local area of the soft soil foundation, the steel pipe pile is inserted into and penetrates through the reinforced foundation to be sunk into the soft soil foundation, and the reinforced foundation comprises the sand pile and soft soil among the sand piles; the sand piles are uniformly arranged at intervals; the central longitudinal axis of the reinforced foundation is consistent with the central longitudinal axis of the steel pipe pile.
Based on the technical characteristics: the periphery and the interior of the steel pipe pile are reinforced foundations.
Based on the technical characteristics: the periphery of the steel pipe pile is a reinforced foundation, and soft soil is arranged in the steel pipe pile.
Based on the technical characteristics: and pile periphery anti-scouring structures are arranged on the upper surface of the soft soil foundation around the steel pipe pile.
Based on the technical characteristics: the anti-scouring structure around the pile is a covering layer paved by riprap or soft rows or interlocking blocks or solidified soil.
Based on the technical characteristics: the sand piles are arranged in concentric circles or regular triangles or squares.
Based on the technical characteristics: the sand pile comprises a compacted sand pile.
An auxiliary structure is arranged outside the pile body of the steel pipe pile above the seabed. The ancillary structures include, but are not limited to, steel platforms, berthing structures, and electrical conduits. And reserving positions on the steel pipe piles for being connected with the auxiliary structure.
Among the above-mentioned technical scheme, the effect of sand stake has several aspects: firstly, to the local replacement of soft soil foundation, sand pile intensity is higher than the intensity of soft soil on every side promptly, forms composite foundation, and the bulk strength is than former soil body improvement. And secondly, the water in the surrounding soft soil is discharged under the action of external load to realize the improvement of soil body strength as a drainage channel. And thirdly, the compaction function is realized, the construction process has the extrusion function on surrounding soft soil, and the water in the surrounding soft soil is promoted to be discharged, so that the soil strength is improved.
The technical scheme is also suitable for the compacted sand pile, the compacted sand pile can become more compact under the vibration action, and the strength can be improved; meanwhile, the soil body around is squeezed more strongly, water in the surrounding soft soil is forced to be discharged, the soil body strength is improved, the reinforcing effect is better than that of a common sand pile, and the water discharging effect is slightly weaker.
By applying the offshore single-pile foundation with the sand pile reinforced foundation or the compacted sand pile reinforced foundation, the single-pile foundation can be suitable for wider sea areas and larger fan models, and the higher foundation types with the manufacturing costs such as a high pile cap, a multi-foot stand and a jacket are avoided from being adopted from the basic aspect of fan foundation model selection, so that the construction cost of offshore fan foundation engineering is effectively reduced, the construction period is shortened, and the power generation benefit of a wind power plant is improved.
Compared with the common marine single-pile foundation, the marine single-pile foundation with the sand pile reinforced foundation or the compacted sand pile reinforced foundation has the advantages that the horizontal bearing capacity is effectively improved, the horizontal side shift of the pile top is effectively reduced, the corner at the mud surface of the single pile is effectively reduced, the integral natural vibration frequency of the structure and the foundation is improved, and meanwhile, the steel consumption of the single-pile foundation is saved.
As above, the utility model discloses marine single pile basis that horizontal bearing capacity is high in the soft soil foundation has following beneficial effect: the offshore single-pile foundation with high horizontal bearing performance in the soft soil foundation is economic, safe and reliable, is suitable for wider sea areas and larger fan models, and greatly reduces the construction cost; and the construction process is simple, only a small range of sand pile construction needs to be added, and the implementation is convenient and effective.
Drawings
Fig. 1 is the utility model discloses marine single pile foundation's with sand pile consolidates ground structure schematic diagram.
Fig. 2 is the plan view of the first embodiment of the marine single-pile foundation with sand pile reinforced foundation of the present invention.
Fig. 3 is the plan view of the second embodiment of the marine single-pile foundation with sand pile reinforced foundation.
Fig. 4 is a plan view of a third embodiment of the offshore single-pile foundation with a sand pile reinforced foundation.
Description of the reference symbols
Detailed Description
The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are provided only for illustrating the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected to each other, indirectly connected to each other through an intermediate member, or connected to each other through the inside of two members. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, a steel pipe pile 2 is sunk into the sea bed, the sea bed is a soft soil foundation 1, a reinforced foundation 4 using a sand pile process is provided in a local area within the soft soil foundation 1, the steel pipe pile 2 is inserted into and sunk through the reinforced foundation 4 into the soft soil foundation, and the reinforced foundation 4 includes a sand pile 3 and soft soil therebetween. The central longitudinal axis of the reinforced foundation 4 coincides with the central longitudinal axis of the steel pipe pile 2. The top elevation of the reinforced foundation 4 is located below the mud surface 7 of the soft soil foundation, and the bottom elevation of the reinforced foundation is determined according to engineering requirements and construction equipment conditions. The size of the reinforced foundation can be determined according to the actual conditions of each project and by comprehensively considering the bearing capacity requirement, deformation control and project cost of the steel pipe pile. At the upper surface of soft soil foundation, set up stake week scour prevention structure 5 around steel-pipe pile 2 is around, and stake week scour prevention structure can adopt different schemes, for example throw the overburden that stone, software row, interlocking piece, solidification soil etc. paved, and its function is that the soil body around the prevention stake is washed away by rivers. The soft row comprises geotextile, filling materials and the like; the interlocking blocks comprise reinforced concrete and the like. The plane shape of the pile periphery anti-scouring structure 5 is not limited, the outer edge can be designed into a circular shape, a polygonal shape or an irregular shape, and the size of the pile periphery anti-scouring structure can be actually determined according to various projects. An auxiliary structure is arranged outside the pile body of the steel pipe pile above the seabed. The ancillary structures include, but are not limited to, steel platforms, berthing structures, and electrical conduits. And reserving positions on the steel pipe piles for being connected with the auxiliary structure.
The utility model discloses well steel pipe pile 2 is used for supporting a fan tower section of thick bamboo, transmits superstructure load. The reinforced foundation 4 of the sand pile process mainly has the functions of providing horizontal restraint for the steel pipe pile 2 and transmitting horizontal load to the soft soil foundation 1 in a diffusion mode. The pile periphery anti-scouring structure 5 is used for protecting the soft soil foundation 1 and the reinforced foundation 4, and horizontal constraint cannot be provided due to the fact that the soil body around the steel pipe pile 2 is scoured.
Fig. 2 is a plan view of a first embodiment of the marine single-pile foundation of the present invention having a sand-pile reinforced foundation. The sand piles 3 are evenly arranged along concentric circles with different radiuses outside the steel pipe pile 2 at intervals. The sand pile 3 can be cut by the steel pipe pile 2, and the sand pile is in close contact with the steel pipe pile. The inside of the steel-pipe pile 2 shown in fig. 2 may not be provided with sand piles, i.e., the reinforced foundation 4 using the sand pile process is disposed only in the surrounding area of the steel-pipe pile 2.
Fig. 3 and 4 are plan views of two other embodiments of the marine single-pile foundation of the present invention with sand-pile reinforced foundation. The sand piles 3 are uniformly arranged. A square array arrangement of sand piles 3 is shown in figure 3. The sand piles 3 are arranged in a regular triangular array as shown in fig. 4. The steel pipe pile 2 is inserted into a reinforced foundation 4 having a sand pile, and the central longitudinal axis of the reinforced foundation 4 coincides with the central longitudinal axis of the steel pipe pile 2. The sand piles 3 are arranged in the steel pipe piles 2, and the uniform reinforced foundation 4 is formed better. The arrangement mode of the sand piles or the compacted sand piles is generally square or regular triangle, the sand piles or the compacted sand piles are uniformly arranged, and the arrangement of the pile diameters and the pile intervals can refer to the design specification of the water transport engineering foundation (JTS 147-2017).
The utility model discloses an example of marine single pile foundation construction method: firstly, sand pile or sand compaction pile construction is carried out according to the concentric circle or regular triangle arrangement or square arrangement of a design drawing, which belongs to a mature technology, so that the reinforced foundation 4 of the sand pile or sand compaction pile process is realized. And then the pile sinking construction of the steel pipe pile 2 is completed. And (5) manufacturing an anti-scouring structure 5, and finally installing an auxiliary structure. The utility model discloses realize that fan horizontal load passes to sand pile or crowded close sand pile technology's reinforcement ground 4 and passes soft soil foundation 1 on every side again through steel-pipe pile 2, passes the succinct directness of power route.
To sum up, the utility model discloses a sand pile or crowded dense sand pile improve intensity and the rigidity of the soil body all around the stake, improve the horizontal bearing performance of weak soil foundation, economy, safety, reliable. The utility model discloses the level bears the weight of the dynamic height, pile bolck horizontal displacement is little, pile body inclination is little, foundation rigidity is big, adapts to the characteristics that offshore wind turbine horizontal load is big, satisfies the strict requirement of offshore wind turbine to basic horizontal displacement and pile body inclination, satisfies the requirement of "structure + basis" whole natural frequency of vibrating. The offshore single-pile foundation with high horizontal bearing performance in the soft soil foundation breaks through the restriction of the soft soil foundation on the single-pile foundation, is suitable for a fan with larger single-machine capacity, higher hub height, longer blades and larger horizontal load in a wider sea area, and can select the type from the fan foundation, so that the adoption of high-pile bearing platforms, multi-foot frames, guide pipe frames and other foundation types with higher manufacturing cost is avoided, the manufacturing cost of offshore fan foundation engineering is effectively reduced, the construction period is shortened, and the economic benefit of an offshore wind farm is improved; and the construction process is simple, only a small range of sand piles or compacted sand piles need to be added for construction, and the construction is convenient and effective. Therefore, the utility model discloses the difficult point of using in the soft soil foundation in the current single pile basis has effectively been overcome, therefore has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The utility model provides an offshore single pile basis with sand pile consolidates ground, includes steel-pipe pile (2) of sinking into the seabed, the seabed is soft soil foundation (1), its characterized in that: the soft soil foundation is characterized by further comprising a reinforced foundation (4) formed in a local area of the soft soil foundation by adopting a sand pile process, the steel pipe pile (2) is inserted into and penetrates through the reinforced foundation (4) to be sunk into the soft soil foundation, and the reinforced foundation (4) comprises sand piles (3) and soft soil among the sand piles (3); the sand piles (3) are uniformly arranged at intervals; the central longitudinal axis of the reinforced foundation (4) is consistent with the central longitudinal axis of the steel pipe pile (2).
2. An offshore mono-pile foundation with a sand-pile reinforced foundation as claimed in claim 1, characterised in that: the periphery and the interior of the steel pipe pile (2) are both the reinforced foundation (4).
3. An offshore mono-pile foundation with a sand-pile reinforced foundation as claimed in claim 1, characterised in that: the periphery of the steel pipe pile (2) is the reinforced foundation (4), and soft soil is arranged in the steel pipe pile (2).
4. An offshore mono-pile foundation with a sand-pile reinforced foundation as claimed in claim 1, characterised in that: and a pile periphery anti-scouring structure (5) is arranged on the upper surface of the soft soil foundation (1) around the steel pipe pile (2).
5. An offshore mono-pile foundation with a sand-pile reinforced foundation as claimed in claim 4, characterised in that: the anti-scouring structure (5) around the pile is a covering layer paved by riprap or soft rows or interlocking blocks or solidified soil.
6. An offshore mono-pile foundation with a sand-pile reinforced foundation as claimed in claim 1, characterised in that: the sand piles are arranged in concentric circles or regular triangles or squares.
7. An offshore mono-pile foundation with a sand-pile reinforced foundation according to any one of claims 1-6, characterised in that: the sand pile comprises a compacted sand pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921367985.6U CN211172055U (en) | 2019-08-22 | 2019-08-22 | Offshore single-pile foundation with sand pile reinforced foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921367985.6U CN211172055U (en) | 2019-08-22 | 2019-08-22 | Offshore single-pile foundation with sand pile reinforced foundation |
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| CN211172055U true CN211172055U (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921367985.6U Active CN211172055U (en) | 2019-08-22 | 2019-08-22 | Offshore single-pile foundation with sand pile reinforced foundation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439020A (en) * | 2019-08-22 | 2019-11-12 | 上海勘测设计研究院有限公司 | Marine single-pile foundation with sand pile reinforcing ground |
| CN115467318A (en) * | 2022-08-25 | 2022-12-13 | 中建八局第一建设有限公司 | Soft soil foundation treatment structure |
-
2019
- 2019-08-22 CN CN201921367985.6U patent/CN211172055U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439020A (en) * | 2019-08-22 | 2019-11-12 | 上海勘测设计研究院有限公司 | Marine single-pile foundation with sand pile reinforcing ground |
| CN115467318A (en) * | 2022-08-25 | 2022-12-13 | 中建八局第一建设有限公司 | Soft soil foundation treatment structure |
| CN115467318B (en) * | 2022-08-25 | 2023-08-04 | 中建八局第一建设有限公司 | Soft soil foundation treatment structure |
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