CN112663668A - Disc type composite single-pile fan foundation suitable for soft soil seabed and construction method - Google Patents
Disc type composite single-pile fan foundation suitable for soft soil seabed and construction method Download PDFInfo
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- CN112663668A CN112663668A CN202110054831.7A CN202110054831A CN112663668A CN 112663668 A CN112663668 A CN 112663668A CN 202110054831 A CN202110054831 A CN 202110054831A CN 112663668 A CN112663668 A CN 112663668A
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 239000002689 soil Substances 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 48
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 44
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 16
- 238000007667 floating Methods 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 12
- 238000005056 compaction Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000002787 reinforcement Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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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Abstract
The invention discloses a disc type composite single-pile fan foundation suitable for a soft soil seabed and a construction method, wherein the disc type composite single-pile fan foundation comprises a central large-diameter single pile and compacted sand piles arranged around the central large-diameter single pile, wherein the compacted sand piles around the central large-diameter single pile form a sea bed surface sand pile reinforcing area, a reinforced concrete disc plate is arranged on the sea bed surface sand pile reinforcing area, and the central large-diameter single pile is connected with the reinforced concrete disc plate through underwater high-strength grouting; the construction method comprises 1) driving a central large-diameter single pile into the seabed to a specified depth; 2) adopting a sand pile boat to carry out driving construction on the compacted sand piles, wherein the driving sequence of the compacted sand piles is from inside to outside from the periphery of the piles; 3) sinking and installing a reinforced concrete disc plate in a sand pile reinforcing area of the sea bed surface through a floating crane ship; 4) connecting an annular space between the reinforced concrete disc plate and the central large-diameter single pile through underwater high-strength grouting; 5) installation of the shroud or other attachment is accomplished by the floating crane vessel.
Description
Technical Field
The invention relates to the technical field of offshore foundation structure construction, in particular to a disc type composite single-pile fan foundation suitable for a soft soil seabed and a construction method.
Background
Wind energy is an important clean energy and plays an important role in controlling carbon emission, slowing global climate change, ensuring energy safety and the like. Offshore wind power has the remarkable advantages of high wind speed, low wind shear, low turbulence, high output, close to a load center, convenience in consumption and the like, and becomes one of renewable energy sources with rapid development and the best industrial prospect at present. Soft soil is widely distributed in offshore sea areas, and at present, fan foundations in soft soil seabed generally adopt the forms of high pile cap, jacket, large-diameter single pile and the like. In practical engineering application, due to various problems of the engineering.
High pile cap basis: the foundation has rich construction resources and mature construction process and construction experience. But the construction of the bearing platform of the device needs various construction measures such as steel sleeve boxes, steel reinforcement cage hoisting, large-scale welding of steel members, on-site concrete stirring and the like, and the maintenance period is longer; the bearing platform is made of mass concrete, large-area temperature cracks and shrinkage cracks are easily generated on the surface of the bearing platform due to unfavorable temperature control, and the structural durability is influenced in a high-salt-spray environment; the offshore construction period is long, and the requirement on a weather window is high; the overweight bearing platform structure is a high cantilever, which is unfavorable for the earthquake resistance of the supporting structure; and the foundation is difficult to dismantle after the service period of the fan.
A jacket foundation: the foundation has the characteristics of small wave current load, high structural rigidity, strong bearing capacity, short offshore construction period and the like, is suitable for sea areas with large water depths, and has wide attention in recent years. But the jacket has more rod pieces and nodes, more complex transition sections and large processing, manufacturing and welding workload; the jacket structure has high requirements on pile sinking technology, the horizontal distance and the verticality deviation of the pile foundation after pile sinking are large, so that the jacket is difficult to mount or even cannot be mounted, the foundation is difficult to level due to the large pile top height difference, and extra complex processes such as underwater pile cutting are added; there are also considerable difficulties in controlling the quality of the underwater grout between the jacket legs and the pile.
Major diameter single pile basis: the foundation structure is simple in overall stress, moderate in pile weight and pile diameter under common conditions, convenient to machine and manufacture, short in offshore construction period and the most widely applied fan foundation at present. However, the single pile is greatly restricted by seabed geological conditions and water depth, the applicability of the single pile faces a great challenge in adverse environments such as a soft soil seabed and a large water depth, the manufacture and construction of the super-heavy (> 2000 t), super-large diameter (>10m) and super-long single pile which meet the bearing deformation control requirements are very difficult, and even the completion is difficult under the current construction conditions, so that the application range of the single pile is greatly limited.
Based on the analysis, a safe, reliable, convenient, economical and reasonable basic new technology is lacked in the soft soil seabed, so that the continuous and rapid development of offshore wind power is promoted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a disc type composite single-pile fan foundation which is safe, reliable, convenient and fast to construct and suitable for a soft soil seabed and a construction method thereof aiming at the defects in the prior art.
The invention aims to provide a disc type composite single-pile fan foundation suitable for a soft soil seabed, which mainly comprises a central large-diameter single pile for sinking a pile into soft soil and a compacted sand pile which is arranged around the central large-diameter single pile and used for shallow foundation reinforcement, wherein the pile sinking depth of the central large-diameter single pile is greater than that of the compacted sand pile, the compacted sand pile around the central large-diameter single pile forms a sea bed surface sand pile reinforcement area, a reinforced concrete disc plate is arranged on the sea bed surface sand pile reinforcement area, and the central large-diameter single pile is connected with the reinforced concrete disc plate through underwater high-strength grouting.
Further, the reinforced concrete disc plate is of a land prefabricated structure, the hollow inner diameter of the reinforced concrete disc plate is 30-40 cm larger than the outer diameter of the central large-diameter single pile, rubber seals and shear keys are preset on the hollow inner surface of the reinforced concrete disc plate, the shear keys are preset on the installation surfaces of the central large-diameter single pile and the reinforced concrete disc plate, and the annular space between the central large-diameter single pile and the reinforced concrete disc plate is connected through underwater high-strength grouting.
Furthermore, the outer diameter of the reinforced concrete disc plate is smaller than the regional boundary of the sea bed surface sand pile reinforcing area, the slope toe of the outer edge of the reinforced concrete disc plate is 30-45 degrees, and the thickness of the reinforced concrete disc plate is not smaller than 1 m.
Furthermore, the compacted sand piles are arranged in a plum blossom-shaped equilateral triangle or square shape, the horizontal reinforcing range of the compacted sand piles is not smaller than the horizontal size of the reinforced concrete disc plate, the reinforcing depth below the sea bed surface of the compacted sand piles is not smaller than twice of the diameter of the central large-diameter single pile, and the replacement rate of the compacted sand piles is controlled to be 30% -70% according to the situation of the field.
A construction method of a disc type composite single-pile fan foundation suitable for a soft soil seabed comprises the following steps:
1) a self-elevating platform or a floating crane ship is adopted to drive the central large-diameter single pile into the seabed for a specified depth, and the verticality of the central large-diameter single pile is ensured to be less than 3 per thousand after pile sinking is finished;
2) adopting a sand pile ship to carry out driving construction of compacted sand piles in the designed width and depth range in weak soil around the central large-diameter single pile, wherein the driving sequence of the compacted sand piles is from inside to outside from the periphery of the pile;
3) sinking and installing a reinforced concrete disc plate in a sand pile reinforcing area of the sea bed surface through a floating crane ship;
4) connecting an annular space between the reinforced concrete disc plate and the central large-diameter single pile through underwater high-strength grouting;
5) installation of the shroud or other attachment is accomplished by the floating crane vessel.
The invention has the beneficial technical effects that: 1) compared with the existing high-pile bearing platform foundation, the invention avoids longer field operation time of procedures such as offshore steel bar binding, steel structure welding, concrete pouring and maintenance, greatly saves offshore window period, obviously improves construction efficiency and shortens construction period. 2) Compared with the existing jacket foundation, the method greatly reduces the processing and manufacturing difficulty of the steel structure, reduces the process difficulties of pile sinking, leveling, installation and the like on the sea, avoids the complex processes of underwater pile cutting and the like, reduces the site construction risk and shortens the construction period. 3) Compared with the existing single-pile foundation, the invention effectively reduces the pile weight, the pile diameter and the pile length, avoids the difficult problems of construction difficulty and even construction incapability caused by the limitation of ship machines and equipment resources on the overweight, oversized and overlong single piles, obviously widens the selection range of the ship machines and equipment resources for construction, reduces the risk of site construction, and greatly facilitates the site construction. The novel foundation technology designed by the invention fully exerts respective advantages of the reinforced foundation and the composite single pile, so that the disc type composite single pile exerts excellent horizontal and bending resistance bearing deformation performance in the shallow reinforced foundation, the horizontal displacement and the corner of the foundation mud surface are effectively reduced, and the technical concept is advanced.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic top view of the structure of fig. 1.
In the figure: 1. the method comprises the following steps of (1) central large-diameter single pile, (2) sand compaction pile, (3) reinforced concrete disc plate, and (4) high-strength grouting body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.
As shown in fig. 1-2, the disc type composite single pile fan foundation applicable to the soft soil seabed of the invention mainly comprises a central large-diameter single pile which is sunk into the soft soil and a compacted sand pile which is arranged around the central large-diameter single pile and used for shallow foundation reinforcement, wherein the compacted sand pile is arranged in the soft soil in a certain width and depth range around the central large-diameter single pile, the sunk pile depth of the central large-diameter single pile is greater than the sunk pile depth of the compacted sand pile, the compacted sand pile around the central large-diameter single pile forms a sea bed surface sand pile reinforcement area, a reinforced concrete disc plate is arranged on the sea bed surface sand pile reinforcement area, and the central large-diameter single pile is connected with the reinforced concrete disc plate through underwater high-strength grouting; the central large-diameter single pile is a steel pipe pile without a transition section, and a pile top flange is welded at the top of the steel pipe pile.
Referring to fig. 1-2, the reinforced concrete disc plate is of a land prefabricated structure, the hollow inner diameter of the reinforced concrete disc plate is 30-40 cm larger than the outer diameter of a central large-diameter single pile, rubber seals and shear keys are preset on the hollow inner surface of the reinforced concrete disc plate, shear keys are preset on the installation surfaces of the central large-diameter single pile and the reinforced concrete disc plate, and an annular space between the central large-diameter single pile and the reinforced concrete disc plate is connected through underwater high-strength grouting. The outer diameter of the reinforced concrete disc plate is smaller than the regional boundary of the sea bed surface sand pile reinforcing area, the slope toe of the outer edge of the reinforced concrete disc plate is 30-45 degrees, and the thickness of the reinforced concrete disc plate is not smaller than 1 m.
Referring to fig. 1-2, the compacted sand piles are arranged in a plum blossom-shaped equilateral triangle or square shape, the horizontal reinforcing range of the compacted sand piles is not less than the horizontal size of the reinforced concrete disc plate, the reinforcing depth below the sea bed surface of the compacted sand piles is not less than twice of the diameter of the central large-diameter single pile, and the replacement rate of the compacted sand piles is controlled to be 30% -70% according to the situation of the field.
A construction method of a disc type composite single-pile fan foundation suitable for a soft soil seabed comprises the following steps:
1) a self-elevating platform or a floating crane ship is adopted to drive the central large-diameter single pile into the seabed for a specified depth, and the verticality of the central large-diameter single pile is ensured to be less than 3 per thousand after pile sinking is finished;
2) adopting a sand pile ship to carry out driving construction of compacted sand piles in the designed width and depth range in weak soil around the central large-diameter single pile, wherein the driving sequence of the compacted sand piles is from inside to outside from the periphery of the pile;
3) sinking and installing a reinforced concrete disc plate in a sand pile reinforcing area of the sea bed surface through a floating crane ship;
4) connecting an annular space between the reinforced concrete disc plate and the central large-diameter single pile through underwater high-strength grouting;
5) and the installation of other auxiliary components such as a lantern ring and the like is finished through the floating crane ship.
The invention gives full play to the excellent horizontal and bending-resistant bearing deformation resistance of the disc type composite single pile in the shallow reinforced foundation, greatly facilitates the field construction while optimizing the foundation engineering quantity, and better solves the problems of the high pile cap foundation, the jacket foundation and the single pile foundation in the soft soil seabed. Compared with the existing fan foundation technology in the soft soil seabed, the invention fully exerts the respective advantages of the reinforced foundation and the composite single pile, so that the disc type composite single pile exerts excellent horizontal and bending-resistant bearing deformation performance in the shallow reinforced foundation, the horizontal displacement and the corner of the foundation mud surface are effectively reduced, and the technical concept is advanced; the method has the advantages that the pile weight, the pile diameter and the pile length of the central single pile are greatly reduced, the resource selection range of a construction ship machine and equipment is remarkably widened, the field construction is greatly facilitated, the field construction risk and difficulty are reduced, meanwhile, the method has the characteristics of environmental protection in process, short offshore construction period, no field welding, good comprehensive economy and the like, and the technical effect is remarkable.
The specific embodiments described herein are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can 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 (5)
1. The utility model provides a be suitable for compound single pile fan basis of disc type on weak soil seabed which characterized in that: the marine bed surface sand pile reinforcing area is provided with a reinforced concrete disc plate, and the central large-diameter single pile is connected with the reinforced concrete disc plate through underwater high-strength grouting.
2. The disc type composite single-pile fan foundation applicable to the soft soil seabed as claimed in claim 1, wherein: the reinforced concrete disc plate is of a land prefabricated structure, the hollow inner diameter of the reinforced concrete disc plate is 30-40 cm larger than the outer diameter of the central large-diameter single pile, rubber seals and shear keys are preset on the hollow inner surface of the reinforced concrete disc plate, the shear keys are preset on the installation surfaces of the central large-diameter single pile and the reinforced concrete disc plate, and the annular space between the central large-diameter single pile and the reinforced concrete disc plate is connected through underwater high-strength grouting.
3. The disc type composite single-pile fan foundation applicable to the soft soil seabed as claimed in claim 2, wherein: the outer diameter of the reinforced concrete disc plate is smaller than the regional boundary of the sea bed surface sand pile reinforcing area, the slope toe of the outer edge of the reinforced concrete disc plate is 30-45 degrees, and the thickness of the reinforced concrete disc plate is not smaller than 1 m.
4. The disc type composite single-pile fan foundation applicable to the soft soil seabed as claimed in any one of claims 1 to 3, wherein: the sand compaction pile is arranged in a plum blossom-shaped equilateral triangle or square shape, the horizontal reinforcing range of the sand compaction pile is not smaller than the horizontal size of the reinforced concrete disc plate, the reinforcing depth below the sea bed surface of the sand compaction pile is not smaller than twice of the diameter of the central large-diameter single pile, and the replacement rate of the sand compaction pile is controlled to be 30% -70% according to the condition of a field.
5. The method for constructing the disc type composite single-pile fan foundation suitable for the soft soil seabed as claimed in claim 4, is characterized in that: the method comprises the following steps:
1) a self-elevating platform or a floating crane ship is adopted to drive the central large-diameter single pile into the seabed for a specified depth, and the verticality of the central large-diameter single pile is ensured to be less than 3 per thousand after pile sinking is finished;
2) adopting a sand pile ship to carry out driving construction of compacted sand piles in the designed width and depth range in weak soil around the central large-diameter single pile, wherein the driving sequence of the compacted sand piles is from inside to outside from the periphery of the pile;
3) sinking and installing a reinforced concrete disc plate in a sand pile reinforcing area of the sea bed surface through a floating crane ship;
4) connecting an annular space between the reinforced concrete disc plate and the central large-diameter single pile through underwater high-strength grouting;
5) installation of the shroud or other attachment is accomplished by the floating crane vessel.
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| CN202110054831.7A CN112663668A (en) | 2021-01-15 | 2021-01-15 | Disc type composite single-pile fan foundation suitable for soft soil seabed and construction method |
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| CN202110054831.7A CN112663668A (en) | 2021-01-15 | 2021-01-15 | Disc type composite single-pile fan foundation suitable for soft soil seabed and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20090123528A (en) * | 2008-05-28 | 2009-12-02 | 석정건설주식회사 | Apparatus protecting spreading particulate clay from marine or submarine and method constructing sand or stone column with it |
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| CN109881659A (en) * | 2019-03-27 | 2019-06-14 | 东南大学 | A kind of offshore wind farm steel pipe pile foundation foundation reinforcement method with protection against erosion ability |
| 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 |
| CN110644521A (en) * | 2019-09-18 | 2020-01-03 | 中国三峡新能源(集团)股份有限公司 | Offshore wind power anti-icing structure single pile reinforcement treatment method and reinforced foundation |
| CN214401872U (en) * | 2021-01-15 | 2021-10-15 | 中国能源建设集团浙江省电力设计院有限公司 | Disc type composite single-pile fan foundation suitable for soft soil seabed |
-
2021
- 2021-01-15 CN CN202110054831.7A patent/CN112663668A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090123528A (en) * | 2008-05-28 | 2009-12-02 | 석정건설주식회사 | Apparatus protecting spreading particulate clay from marine or submarine and method constructing sand or stone column with it |
| CN108487294A (en) * | 2018-05-24 | 2018-09-04 | 福建龙源海上风力发电有限公司 | A kind of embedding rock single pile construction method of offshore wind farm super-large diameter implanted and system |
| CN109853608A (en) * | 2018-12-25 | 2019-06-07 | 长江勘测规划设计研究有限责任公司 | A kind of offshore wind turbine gravity type foundation composite foundation and its processing method |
| CN109881659A (en) * | 2019-03-27 | 2019-06-14 | 东南大学 | A kind of offshore wind farm steel pipe pile foundation foundation reinforcement method with protection against erosion ability |
| 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 |
| CN110644521A (en) * | 2019-09-18 | 2020-01-03 | 中国三峡新能源(集团)股份有限公司 | Offshore wind power anti-icing structure single pile reinforcement treatment method and reinforced foundation |
| CN214401872U (en) * | 2021-01-15 | 2021-10-15 | 中国能源建设集团浙江省电力设计院有限公司 | Disc type composite single-pile fan foundation suitable for soft soil seabed |
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