CN110847218A - Composite foundation with piles arranged outside cylinder and cylinder offshore wind power foundation and construction method - Google Patents
Composite foundation with piles arranged outside cylinder and cylinder offshore wind power foundation and construction method Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 64
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 239000004567 concrete Substances 0.000 claims abstract description 55
- 208000014617 hemorrhoid Diseases 0.000 claims abstract description 35
- 230000007704 transition Effects 0.000 claims abstract description 28
- 239000002689 soil Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 21
- 239000004568 cement Substances 0.000 claims description 19
- 238000009434 installation Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 abstract 2
- 239000004927 clay Substances 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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- E02D27/32—Foundations for special purposes
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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
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Abstract
The invention relates to a composite foundation with piles distributed outside a cylinder, a cylinder offshore wind power foundation and a construction method, which are suitable for the offshore area covered with thick silt, mucky soil, silt and other soft soil on the offshore surface layer in China, wherein the wind power foundation comprises a concrete transition section, a composite cylinder foundation, a concrete circular bottom plate and cylinder peripheral piles, the composite cylinder foundation is of a multi-bin structure with a lower opening cavity and sinks in the soft soil on the surface layer, the cylinder top is in contact with a mud surface, and the cylinder peripheral piles are uniformly distributed on the periphery of the composite cylinder foundation. The manufacturing size of the suction tube is reduced, and the foundation cost is reduced.
Description
Technical Field
The invention relates to an offshore wind power foundation structure, in particular to an offshore wind power foundation and a construction method thereof.
Background
Based on the condition that the offshore area of China is mostly soft foundation conditions such as silt, silty clay and the like, the requirements of foundation bearing capacity and foundation deformation are generally met, the traditional pile foundation such as a single-pile foundation and a jacket foundation is usually adopted, the two foundation forms need large-scale hoisting ships and piling ships for auxiliary construction, and the piles penetrate through a soft soil layer to enter a better bearing layer through hammering piling, so that the traditional pile type foundation is higher in manufacturing cost and long in construction period.
With the increase of the capacity of a single machine of an offshore wind turbine, the size and the material consumption of a foundation need to be increased by adopting a traditional single pile and jacket foundation, and the limitation of construction equipment on the pile driving of a large-diameter single pile becomes a problem that the pile driving of the large-diameter single pile is difficult to exceed, aiming at the problem, a suction type composite barrel foundation as described in patent CN107761755A and patent CN106759445 is gradually used for offshore wind power, a negative pressure sinking installation mode of the barrel foundation (as shown in patent CN 105926661A) avoids a complicated pile driving process, the barrel foundation is suitable for soil layers with certain bearing capacity such as clay, sandy soil and the like due to the stress characteristic and the construction method, the diameter of a barrel needs to be increased by adopting the barrel foundation aiming at sludge and mucky soil layers with poor bearing capacity, and the problems of great foundation settlement and great inclined deformation are brought due to the increase of the weight and the fan load of the barrel foundation, if the size of the barrel foundation is excessively increased, not only is the cost increased, but the one-step installation (as shown in patent CN 102926949A) cannot be realized, and the economic advantage compared with the single pile and the jacket is no longer existed.
The composite offshore wind power foundation and the construction method thereof solve the problems of bearing capacity and deformation of the offshore wind power soft foundation, do not need pile driving construction, have great advantages in the construction process, enter a wind power plant field area in advance to form piles when the cylindrical foundation is manufactured on land, adopt a one-step integral installation process for the cylindrical foundation, have good economy and are suitable for the soft foundations such as silt, mucky soil, silt and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a composite foundation with piles distributed outside a cylinder, a cylinder offshore wind power foundation and a construction method.
The technical scheme adopted by the invention is as follows: the utility model provides a compound ground of outer cloth stake of section of thick bamboo-marine wind power basis which characterized in that: the concrete transition section is arranged on the lower end of the composite cylindrical foundation, and the composite cylindrical foundation is arranged on the lower end of the concrete transition section; the composite cylinder type foundation comprises a cylinder wall, bin dividing plates and a cylinder top cover, wherein the cylinder wall and the cylinder top cover are enclosed to form a cylinder type cavity with a closed upper end and an open lower end; the diameter D of the concrete circular bottom plate is equal to that of the cylindrical foundation, a pile replacement area is arranged on the periphery of the composite cylindrical foundation, the cylindrical peripheral piles are uniformly distributed in the pile replacement area, and the radius of the pile replacement area is 1.5D-3.0D.
Preferably, the concrete transition section and the concrete circular bottom plate are separately poured, shear pins are pre-embedded in the concrete circular bottom plate, and the concrete transition section, the concrete circular bottom plate and the composite cylindrical foundation are connected into a whole through the shear pins.
Preferably, the concrete transition section is of an internal cavity structure, the wall thickness is not less than 0.5m, reinforcing steel bars are arranged in the concrete to enhance the tensile strength of the concrete, and the upper portion of the concrete transition section is in butt joint with the tower barrel.
Preferably, the bin dividing plate and the cylinder wall are connected in a groove welding manner or a pouring manner, stiffening ribs are uniformly arranged on the inner side of the cylinder wall and the single side of the bin dividing plate at intervals of 0.5-1.0 m, and the length of each stiffening rib is consistent with the height of the cylinder wall.
Preferably, the pile on the periphery of the cylinder is a double-shaft or multi-shaft cement mixing pile type, or a compacted sand pile.
Preferably, the pile on the periphery of the cylinder penetrates through the weak geological layer to reach the soil layer; if the soft geological layer is thick, the pile length does not penetrate the soft geological layer, and the bearing capacity meets the requirement, the pile bottom is suspended in the soft geological layer, and the length of the suspended pile is not more than 25 m.
Preferably, the distance between the pile top of the pile on the periphery of the cylinder and the cylinder top is kept between 0 and 1.0m, and the pile distance is larger than the pile diameter; the distance between the pile at the periphery of the cylinder and the cylinder wall is 0.2-2.0 m.
A construction method of a composite foundation with piles distributed outside a cylinder and a cylinder offshore wind power foundation is characterized in that: the method comprises the following steps:
a. prefabricating a concrete transition section, a concrete circular bottom plate and a composite cylindrical foundation in a land base, and connecting the concrete transition section, the concrete circular bottom plate and the composite cylindrical foundation into a whole through shear studs;
b. in the process of manufacturing the composite cylinder type foundation on land, an underwater pile forming ship is used to reach a fan position for pile forming operation, pile distributing points need to be accurately positioned in order to not influence the sinking of the composite cylinder type foundation, a sinking channel is reserved for the cylinder wall, and the clear distance between the adjacent pile positions and the cylinder wall is 0.2-2.0 m;
c. the stirring drill rod penetrates to the pile bottom elevation at the periphery of the cylinder, the stirring drill rod is delivered to a drill bit grout spraying port from a feeding bin to be sprayed out, the stirring wings rotate to stir, the stirring drill rod is lifted upwards at the same time, and the pile forming process is completed repeatedly;
d. and c, when the peripheral piles of the barrel reach the strength, transporting the composite barrel type foundation to a designated fan position, adjusting the position and the angle of the composite barrel type foundation to enable the barrel wall and the bin dividing plate to perform negative pressure sinking in the channel reserved between the adjacent surrounding piles in the step b, and leveling to complete the installation of the composite barrel type foundation.
The beneficial effects obtained by the invention are as follows: the invention combines the advantages of the underwater deep cement mixing pile (or the compaction sand pile) and the cylindrical foundation, the cylindrical foundation has large bearing area and good stability, the pile driving is not needed, but under the condition of weak soil, the cylindrical foundation has larger settlement and inclination, and the cement pile (or the compaction sand pile) is arranged in the cylindrical foundation, thereby solving the problem of foundation deformation of the cylindrical foundation, reducing the manufacturing size of the suction tube and reducing the foundation cost. The integral cylindrical foundation is manufactured on land, integrated towing and installation are adopted, negative pressure sinking is matched after the pile reaches a mud surface, construction is convenient, the pile can be formed by using an underwater pile-forming ship to an offshore fan position in advance during manufacturing of the cylindrical foundation, the construction window period of the cylindrical foundation is not occupied, the construction period is flexible, and the construction difficulty is small. The whole construction process avoids the use of large offshore hoisting and piling equipment, realizes the integrated installation of the offshore wind turbine complete machine, reduces the installation cost, saves foundation manufacturing cost and installation cost which are far larger than the pile forming cost of the peripheral piles of the cylinders, can reduce the comprehensive manufacturing cost by 10 to 25 percent compared with the conventional composite cylinder type foundation in the same field, and is suitable for most offshore areas with soft covering layers in China.
Drawings
FIG. 1 is an elevational cross-sectional view of the present invention;
FIG. 2 is a top view of the cloth pile of the present invention;
FIG. 3 is a schematic view of an underwater pile forming vessel of the present invention;
reference numerals: 1. a concrete transition section; 2. a concrete circular bottom plate; 3. a cylinder wall; 4. a bin dividing plate; 5. a cartridge top cover; 6. a stiffening rib; 7. pile at the periphery of the cylinder; 8. underwater pile-forming ship; 9. stirring drill pipes (or sand pile casings); 10. stirring wings (or pile sinking vibration hammers); 11. and a feeding bin.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
As shown in fig. 1-3, the pile-arranged composite foundation outside a cylinder-offshore wind power foundation of the invention comprises a concrete transition section 1, a composite cylinder type foundation and a concrete circular bottom plate 2, wherein the concrete transition section 1 is of an internal cavity structure, the wall thickness can be freely selected and is not less than 0.5m, reinforcing steel bars are arranged in concrete to enhance the tensile strength of the concrete transition section, and the diameter of an upper opening can be adjusted according to the diameter of a tower cylinder, so that the concrete transition section 1 can be butted with the tower cylinder; the lower end of the concrete transition section 1 is provided with a composite cylindrical foundation, and a concrete circular bottom plate 2 is arranged between the concrete transition section 1 and the composite cylindrical foundation. In the embodiment, the concrete transition section 1 and the concrete circular bottom plate 2 are separately poured, the shear studs are embedded in the concrete circular bottom plate 2, and the concrete transition section 1, the concrete circular bottom plate 2 and the cylinder top cover 5 of the composite cylinder foundation are connected into a whole through the shear studs.
The composite cylinder type foundation comprises a cylinder wall 3, a bin dividing plate 4 and a cylinder top cover 5, wherein the cylinder wall 3 and the cylinder top cover 5 are enclosed to form a cylinder type cavity with a closed upper end and an open lower end, the bin dividing plate 4 is arranged in the cylinder type cavity and divides the cylinder type cavity into a plurality of bin dividing cavities along an axis; the diameter D of the concrete circular bottom plate 2 is equal to that of the cylindrical foundation 3, and the thickness is determined according to the diameter of the cylindrical foundation and the unit load; the periphery of the composite cylindrical foundation is provided with a pile replacement region, cylindrical peripheral piles 7 are uniformly distributed in the pile replacement region, and the radius of the pile replacement region is 1.5D-3.0D.
The bin dividing plate 4 and the bin dividing plate 3 are connected in a groove welding seam or pouring mode, stiffening ribs 6 are arranged on the inner side of the bin dividing plate 3 and one side of the bin dividing plate 4 at equal intervals to prevent steel plates from buckling, the arrangement interval is 0.5-1.0 m, and the length of each stiffening rib 6 is consistent with the height of the bin dividing plate 3. The barrel wall 3, the bin dividing plate 4, the barrel top cover 5 and the stiffening ribs 6 are all thin-walled parts.
In this embodiment, the cylindrical outer circumferential piles 7 are of a double-shaft or multi-shaft cement-mixed pile type, or compacted sand piles. The pile 7 on the periphery of the cylinder penetrates through the soft geological layer to reach the soil layer; if the weak geological layer is thick, the pile length does not penetrate the weak geological layer, and the bearing capacity meets the requirement, the pile bottom is suspended in the weak layer, and the length of the suspended pile is not more than 25 m.
In the embodiment, the distance of 0-1.0 m is reserved between the pile top of the pile 7 on the periphery of the cylinder and the cylinder top, and the pile distance is larger than the pile diameter; the distance between the pile 7 on the periphery of the cylinder and the cylinder wall 3 is 0.2 m-2.0 m.
A construction method of a composite foundation with piles arranged outside a cylinder and a cylinder offshore wind power foundation comprises the following steps:
a. prefabricating a concrete transition section 1, a concrete circular bottom plate 2 and a composite cylindrical foundation in a land base, and connecting the concrete transition section 1, the concrete circular bottom plate 2 and the composite cylindrical foundation into a whole through shear studs;
b. in the process of manufacturing the composite cylinder type foundation on land, the underwater pile forming ship 8 is used to the fan position for pile forming operation, pile distributing points need to be accurately positioned in order to not influence the sinking of the composite cylinder type foundation, a sinking channel is reserved for the cylinder wall 3, the clear distance between the adjacent pile positions and the cylinder wall 3 is 0.2-2.0 m, and the rest piles are formed in the pile replacement area range according to the designed pile spacing;
c. the stirring drill rod 9 penetrates to the bottom elevation of the pile 7 on the periphery of the cylinder, the pile is delivered to a drill bit grout spraying port from a feeding bin 11 to be sprayed out, the stirring wings 10 rotate to stir, meanwhile, the stirring drill rod 9 is lifted upwards, and the pile forming process is completed repeatedly;
d. and (c) when the piles 7 on the periphery of the barrel reach the strength, transporting the composite barrel type foundation to a designated fan position, adjusting the position and the angle of the composite barrel type foundation to enable the barrel wall 3 and the bin dividing plate 4 to perform negative pressure sinking in the channel reserved between the adjacent enclosing piles in the step b, and leveling to complete the installation of the composite barrel type foundation.
A suction cylinder-cement mixing pile composite foundation is adopted for a certain machine position of a certain wind power plant, as shown in figure 2. The shallow layer of the machine position is silt silty clay with the thickness of 18.3m, the lower part of the silt silty clay is a slightly-medium dense silty sand layer, and the silty sand layer is used as a cement pile supporting layer, so that the pile length of the cement pile of the machine position is 20.0 m.
According to the arrangement rule of the long piles and the short piles, the barrel peripheral piles 7 are arranged on the periphery of the barrel wall 3 to form a circle of surrounding piles, fixed-point pile forming is carried out outside the surrounding piles, the radius outside the replacement area of the cement piles (barrel peripheral piles) is 1.5D, GPS (global positioning system) is required to be used for accurate positioning during pile forming, and the error is not more than 0.3 m.
In order to reduce the number of piles and the workload, the cement mixing piles adopt a multi-shaft pile type such as double-shaft or four-shaft mixing piles, and the piles are staggered.
The cement pile forming method comprises the following steps: pile position lofting → underwater pile forming ship 8 in position → inspection, adjusting drill → stirring drill rod 9 is drilled to the designed depth in forward circulation → stirring drill rod 9 is lifted in reverse circulation and cement slurry is sprayed → is 0.3m below the mud surface → repeated stirring and drilling to the designed depth → lifted in reverse circulation and cement slurry is sprayed 0.3m below the mud surface → pile forming is finished.
After the pile is formed, the maintenance is not less than 28 days, and the strength of the cement pile (the pile on the periphery of the cylinder) needs to be detected by static sounding and drilling coring.
The stake of section of thick bamboo periphery stake 7 and maintenance period, make the compound shell type basis of equipment on land simultaneously, after stake intensity reached the requirement, with compound shell type basis transportation to appointed machine position, through GPS location, the compound shell type basis direction of adjustment makes section of thick bamboo wall and branch storehouse board 4 avoid the region of pouring into the cement stake, relies on the dead weight to sink into one section degree of depth of mud, is equipped with the technological means that the negative pressure sinks and makes compound shell type basis sink to section of thick bamboo top cover 5 and the contact of mud face flushing, the construction finishes.
Structural comparison: if only a suction tube is adopted, the diameter of the tube type foundation needs 44.0m, the soil penetration depth needs 10.0m, the total weight of the foundation is 6200.0 tons, the structural stress level of the foundation under the limit load combination action under the size is within the range specified by the specification, the foundation inclination rate (differential settlement) is 5.99 per thousand, and within 8.7 per thousand specified by the specification, the calculated safety coefficient of the vertical bearing capacity of the foundation is 5.32, the anti-skid safety coefficient is 6.31, the anti-overturning safety coefficient is 1.71, and the bearing capacity meets the specification requirement. And the suction tube-full-paved long and short cement pile composite foundation is adopted, the double-shaft stirring pile which is driven in advance is equivalent to a circular pile body with the diameter D of 1.778m, and the actual pile cluster area Ap＝2.483m3Actual circumference upThe area substitution rate m was 15% at 6.36 m. Calculated, the characteristic value of the vertical bearing capacity of the single cement pileRa856kN, the cement pile body is compression molded with EpAccording to the bearing capacity and deformation calculation method of the composite foundation, after the cement pile is driven into the machine position, the compression modulus E of a cement affected zone of the machine position is 15% multiplied by 50+ 85% multiplied by 1.04 is 8.38MPa, the diameter of a suction tube under the working condition is only 36.0m, the penetration depth is 10.0m, the total weight of the foundation is 3600.0 tons, the structural stress level of the foundation under the limit load combination is in the range specified by the specification, the foundation inclination rate (differential settlement) is 6.02 thousandths, the safety coefficient of the composite foundation is calculated to be 4.23, the anti-skid safety coefficient is 6.24, the anti-overturning safety coefficient is 1.60 within 8.7 thousandths specified by the specification, and the bearing capacity meets the specification requirement.
And (3) economic analysis: if only a suction type cylindrical foundation is adopted, the manufacturing cost of the cylindrical foundation with the diameter of 44m is 1200 ten thousand, the existing installation ship cannot meet the construction requirement due to the fact that the foundation is too heavy and the diameter is too large, the existing installation ship cannot be installed in a one-step mode through integration of the foundation, a tower drum and a fan head, an extra-large offshore floating crane is needed for installation, the cylindrical foundation needs to be installed in place during installation, then the tower drum and the fan head are hoisted on the sea, the total installation cost is 1300 ten thousand, and therefore the total cost of the unit is 2500 ten thousand when only the suction type cylindrical foundation is adopted. When the suction tube-full-paved long and short pile composite foundation is adopted, the diameter of the suction tube type foundation is reduced from 44 meters to 36 meters, and the manufacturing cost of the suction tube type foundation is 1000 ten thousand. The weight and the diameter of the foundation are reduced, the existing installation ship can be adopted for integrated one-step installation, an oversize offshore floating crane is not needed, the installation cost is 100 thousands, the pile forming cost of the fully paved long and short piles is calculated to be 300 thousands, the total cost of the machine position is 1400 thousands when the suction barrel-fully paved long and short pile composite foundation is adopted, and the total manufacturing and installation cost can be reduced by 1100 thousands (about 44.0%) compared with the current most economic suction barrel type foundation single fan whole machine. In addition, the suction barrel-full-paved long and short pile composite foundation can be integrally installed in one step, so that the offshore hoisting time is shortened, and part of construction period cost can be reduced.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a compound ground of outer cloth stake of section of thick bamboo-marine wind power basis which characterized in that: the concrete transition section is arranged on the lower end of the composite cylindrical foundation, and the composite cylindrical foundation is arranged on the lower end of the concrete transition section; the composite cylinder type foundation comprises a cylinder wall, bin dividing plates and a cylinder top cover, wherein the cylinder wall and the cylinder top cover are enclosed to form a cylinder type cavity with a closed upper end and an open lower end; the diameter D of the concrete circular bottom plate is equal to that of the cylindrical foundation, a pile replacement area is arranged on the periphery of the composite cylindrical foundation, the cylindrical peripheral piles are uniformly distributed in the pile replacement area, and the radius of the pile replacement area is 1.5D-3.0D.
2. The pile-arranged-outside-barrel composite foundation-barrel offshore wind power foundation of claim 1, characterized in that: the concrete transition section and the concrete circular bottom plate are poured in a split mode, shear pins are pre-embedded in the concrete circular bottom plate, and the concrete transition section, the concrete circular bottom plate and the composite cylindrical foundation are connected into a whole through the shear pins.
3. The pile-arranged-outside-barrel composite foundation-barrel offshore wind power foundation of claim 1, characterized in that: the concrete transition section is of an internal cavity structure, the wall thickness is not less than 0.5m, reinforcing steel bars are arranged in the concrete to enhance the tensile strength of the concrete, and the upper portion of the concrete transition section is in butt joint with the tower barrel.
4. The pile-arranged-outside-barrel composite foundation-barrel offshore wind power foundation of claim 1, characterized in that: the bin dividing plate and the bin wall are connected in a groove welding seam or pouring mode, stiffening ribs are arranged on the inner side of the bin wall and the single side of the bin dividing plate at equal intervals, the arrangement interval is 0.5-1.0 m, and the length of each stiffening rib is consistent with the height of the bin wall.
5. The pile-arranged-outside-barrel composite foundation-barrel offshore wind power foundation of claim 1, characterized in that: the peripheral pile of the cylinder is of a double-shaft or multi-shaft cement stirring pile type or a compacted sand pile.
6. The pile-arranged-outside-barrel composite foundation-barrel offshore wind power foundation of claim 1, characterized in that: the pile at the periphery of the cylinder penetrates through the soft geological layer to reach the soil layer; if the weak geological layer is thick, the pile length does not penetrate the weak geological layer, and the bearing capacity meets the requirement, the pile bottom is suspended in the weak layer, and the length of the suspended pile is not more than 25 m.
7. The pile-arranged-outside-barrel composite foundation-barrel offshore wind power foundation of claim 1, characterized in that: the distance between the pile top of the pile at the periphery of the cylinder and the cylinder top is kept to be 0-1.0 m, and the pile distance is larger than the pile diameter; the distance between the pile at the periphery of the cylinder and the cylinder wall is 0.2-2.0 m.
8. A construction method of a composite foundation with piles distributed outside a cylinder and a cylinder offshore wind power foundation is characterized in that: the method comprises the following steps:
a. prefabricating a concrete transition section, a concrete circular bottom plate and a composite cylindrical foundation in a land base, and connecting the concrete transition section, the concrete circular bottom plate and the composite cylindrical foundation into a whole through shear studs;
b. in the process of manufacturing the composite cylinder type foundation on land, an underwater pile forming ship is used to reach a fan position for pile forming operation, pile distributing points need to be accurately positioned in order to not influence the sinking of the composite cylinder type foundation, a sinking channel is reserved for the cylinder wall, and the clear distance between the adjacent pile positions and the cylinder wall is 0.2-2.0 m;
c. the stirring drill rod penetrates to the pile bottom elevation at the periphery of the cylinder, the stirring drill rod is delivered to a drill bit grout spraying port from a feeding bin to be sprayed out, the stirring wings rotate to stir, the stirring drill rod is lifted upwards at the same time, and the pile forming process is completed repeatedly;
d. and c, when the peripheral piles of the barrel reach the strength, transporting the composite barrel type foundation to a designated fan position, adjusting the position and the angle of the composite barrel type foundation to enable the barrel wall and the bin dividing plate to perform negative pressure sinking in the channel reserved in the step b between the adjacent surrounding piles, and leveling to complete the installation of the composite barrel type foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911311617.4A CN110847218A (en) | 2019-12-18 | 2019-12-18 | Composite foundation with piles arranged outside cylinder and cylinder offshore wind power foundation and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911311617.4A CN110847218A (en) | 2019-12-18 | 2019-12-18 | Composite foundation with piles arranged outside cylinder and cylinder offshore wind power foundation and construction method |
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| CN110847218A true CN110847218A (en) | 2020-02-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106013204A (en) * | 2016-05-30 | 2016-10-12 | 上海电力设计院有限公司 | Method for applying gravity-type foundation to offshore wind power engineering in sea area with soft-soil seabed |
| CN108222049A (en) * | 2018-01-02 | 2018-06-29 | 天津大学 | A kind of offshore wind farm combined type single-pile foundation and its construction method |
| CN109440805A (en) * | 2018-11-30 | 2019-03-08 | 天津大学 | A kind of long-short pile bucket foundation and its construction method suitable for deep water complex sea area |
| CN211621665U (en) * | 2019-12-18 | 2020-10-02 | 长江勘测规划设计研究有限责任公司 | Composite foundation with externally arranged piles and offshore wind power foundation |
-
2019
- 2019-12-18 CN CN201911311617.4A patent/CN110847218A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106013204A (en) * | 2016-05-30 | 2016-10-12 | 上海电力设计院有限公司 | Method for applying gravity-type foundation to offshore wind power engineering in sea area with soft-soil seabed |
| CN108222049A (en) * | 2018-01-02 | 2018-06-29 | 天津大学 | A kind of offshore wind farm combined type single-pile foundation and its construction method |
| CN109440805A (en) * | 2018-11-30 | 2019-03-08 | 天津大学 | A kind of long-short pile bucket foundation and its construction method suitable for deep water complex sea area |
| CN211621665U (en) * | 2019-12-18 | 2020-10-02 | 长江勘测规划设计研究有限责任公司 | Composite foundation with externally arranged piles and offshore wind power foundation |
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