GB2609841A - Monopile foundation using cemented vibroflotation pile to reinforce soft soil foundation for use in offshore wind power generation, and construction method - Google Patents
Monopile foundation using cemented vibroflotation pile to reinforce soft soil foundation for use in offshore wind power generation, and construction method Download PDFInfo
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- GB2609841A GB2609841A GB2216354.7A GB202216354A GB2609841A GB 2609841 A GB2609841 A GB 2609841A GB 202216354 A GB202216354 A GB 202216354A GB 2609841 A GB2609841 A GB 2609841A
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- piles
- vibroflotation
- pile
- cemented
- monopile
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- 239000002689 soil Substances 0.000 title claims abstract description 43
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 238000010248 power generation Methods 0.000 title abstract description 3
- 239000000463 material Substances 0.000 claims abstract description 31
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 230000007423 decrease Effects 0.000 claims abstract description 5
- 239000011376 self-consolidating concrete Substances 0.000 claims abstract description 5
- 239000004575 stone Substances 0.000 claims description 47
- 239000004568 cement Substances 0.000 claims description 32
- 230000003014 reinforcing effect Effects 0.000 claims description 20
- 239000011083 cement mortar Substances 0.000 claims description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 abstract 1
- 239000003223 protective agent Substances 0.000 description 5
- 238000009991 scouring Methods 0.000 description 4
- 230000010412 perfusion Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- 239000013535 sea water Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
- E02D27/525—Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/25—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors specially adapted for offshore installation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/95—Mounting on supporting structures or systems offshore
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
-
- 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
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
A monopile foundation using a cemented vibroflotation pile to reinforce a soft soil foundation for use in offshore wind power generation, and a construction method. The monopile foundation comprises a monopile and cemented vibroflotation piles arranged around the monopile. The construction method combines a pile formation process employing deep-sea gravel pile vibroflotation and a gravity grouting process employing underwater self-compacting concrete-based cementing material so as to form cemented vibroflotation piles in a soft soil layer and a bearing layer of a seabed. The cemented vibroflotation piles and soil therebetween form a cemented vibroflotation pile composite foundation. The strengths of the cemented vibroflotation piles in the composite foundation gradually increase from an outer ring to an inner ring and gradually decrease from top to bottom. The cemented vibroflotation pile effectively improves the bearing capability of a soft soil layer, enhances the applicability of a monopile foundation in seabeds covered by a shallow cover layer and near-shore deep-water wind farms, and in addition, eliminates the need to install additional erosion resistant structures, thereby reducing the costs of manufacturing and constructing a foundation, improving construction efficiency, and enhancing the convenience of operation.
Description
MONOPILE FOUNDATION USING CEMENTED VIBROFLOTATION PILE TO REINFORCE SOFT SOIL FOUNDATION FOR USE IN OFFSHORE WIND POWER GENERATION, AND CONSTRUCTION METHOD
FIELD OF THE INVENTION
The invention pertains to the technical field of pile bases of marine engineering, and relates to a monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations and a construction method thereof
BACKGROUND OF THE INVENTION
The offshore wind power has advantages of cleanness and high-efficiency, and pertains to an important trend toward the development of new energy. At present, the monopile bases of offshore wind power have the advantages such as high construction speed, low engineering costs and high foundation applicability, and have been put into installation in the proportion exceeding 80%. With a gradual increase in offshore wind power plants from offshore shallow water areas to offshore deep water areas and even outer ocean areas, and a continuous enlargement of the capacity of wind turbines, the monopile base needs to provide greater horizontal bearing capacity. However, some seabed surfaces in China are covered with deep soft soils, the bearing stratum below the soft soil stratum is relatively thin, and in the case of adopting a conventional monopile base, the soil body near piles cannot provide a horizontal resistance force in accordance with design requirements. In the case of adopting bases such as a guiding pipe frame and a rock-embedded pile, on one hand, the costs for bases will greatly increase, and on the other hand, the construction will remarkably delays. Therefore, research and development on the monopile base suitable for soft soil foundation and with higher horizontal bearing capacity greatly deserves to be applied in engineering.
SUMMARY OF THE INVENTION
The technical problem to be solved by the present invention involves a monopile base with vibrotlotation cemented piles of offshore wind power for reinforcing soft foundations and a construction method thereof, provided with a simple structure and a technical solution of arranging vibroflotation cemented piles in the soil body near a monopile, positioning the vibrotlotation cemented piles in the bearing stratum and the soft soil stratum of the seabed, and the vibroflotation cemented piles and the inter-pile soil body forming a composite
DESCRIPTION
foundation of the vibroflotation cemented piles, so as to enhance the bearing capacity of the soft soil stratum, effectively raise the horizontal bearing capacity of the monopile base, remarkably strengthen the resistance to the deformation of the soil body near piles, reduce the horizontal displacement of the top of the monopile base, improve the resistance to the foundation liquefaction of the monopile base, and improve the vibroflotation frequency of the monopile base and the vibroflotation frequency of the upper structure thereof. Moreover, the monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations suitable for a sea area with a water depth of 30-60m and a seabed with a thin bearing stratum expends the prospect for its application in an offshore deep water area.
In order to solve the above technical problem, the technical scheme adopted in the present invention is as follows: A monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations, comprising vibroflotation cemented piles composed of inner ring pile and outer ring pile positioned outside the inner ring pile, a monopile hole arranged at the center of the inner ring pile and concentric with the centroids of the inner ring pile and the outer ring pile, and the pile body strength of the vibroflotation cemented piles decreasing in sequence from the inside to the outside and from the upper portion to lower portion of the monopile hole, respectively.
A plurality of branch piles arranged in the radial direction of the monopile hole are installed between the inner ring pile and the outer ring pile.
At least one middle ring pile is arranged between the inner ring pile and the outer ring pile, and the centroids of the middle ring piles are concentric with the monopile hole.
The inner ring pile, the outer ring pile, the branch piles and the middle ring piles are all composed of a plurality of vibroflotation cemented piles.
The inner ring pile, the outer ring pile and the middle ring piles are of a circular structure composed of a plurality of vibroflotation cemented piles; and the branch piles are of a linear structure composed of a plurality of vibroflotation cemented piles.
The heights of the inner ring pile, the middle ring piles and the outer ring pile decrease in sequence to form the vibroflotation cemented piles with a conical structure, one end of which with a small cross section faces downwards.
The vibroflotation cemented piles include a columnar body formed by means of cementation of broken stones and underwater self-compacting cement-based cementing material.
A cemented riprap body is arranged on the upper portion of the vibroflotation cemented piles, and the cemented riprap body is of a cone structure, the end of which with a small cross
DESCRIPTION
section faces upwards.
The cemented riprap body is formed by ripraps and underwater self-compacting mortar.
A construction method of the monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations as above, the method comprising the following steps: S1, making piling, drive a monopile vertically downwards into a seabed along a monopile hole by means of pile-driving equipment up to a designed depth, and the lower end of the monopile penetrating through a soft soil stratum to extend into a bearing stratum of the seabed; S2, formation of inner ring pile, which includes the following sub steps: S2-1, vibroflotation made by a vibroflot forming an initial hole, then a conveying system conveying broken stones to the bottom of the vibroflot, and the vibroflotation with feeding enabling formation of a broken stone pile body, meanwhile, an underwater self-compacting cement-based cementing material being conveyed to the bottom of a vibroflot guiding pipe through a conveying pipe, then the underwater self-compacting cement-based cementing material flowing downwards along the gaps of the broken stone pile body, and the vibroflotation along with feeding and cementing enabling formation of a cemented broken stone body; and S2-2, the initial hole in S2-1 being positioned outside the monopile hole, and in the process that the vibroflot gradually rises upwards along the initial hole, continuously repeating S2, so as to form inner ring pile outside the monopile hole; S3, formation of a middle ring piles, the initial hole being positioned outside the inner ring pile, repeating S2-1 and S2-2 along the initial hole in sequence so as to form a middle ring piles outside the inner ring pile; S4, formation of an outer ring pile, the initial hole being positioned outside the middle ring piles, repeating S2-1 and S2-2 along the initial hole in sequence so as to form an outer ring pile outside the middle ring piles, S5, forming a branch piles, the initial hole being positioned inside the outer ring pile or outside the inner ring pile, repeating S2-1 and S2-2 in sequence so as to form a branch piles; wherein the inner ring pile, the middle ring piles, the outer ring pile and an inter-pile soil body are combined to form a composite foundation of vibroflotation cemented piles, or the inner ring pile, the outer ring pile, the branch piles and an inter-pile soil body are combined to form a composite foundation of vibroflotation cemented piles; thus, of the vibroflotation cemented piles, the lower ends extend into the bearing stratum of the seabed, and the upper
DESCRIPTION
ends are positioned in the soft soil stratum of the seabed; S6, filling, pressing a cement-based slurry into the soil body between the inner ring pile and the monopile by means of a grouting device to form solidified soil, through which the inner ring pile is connected with the monopile; and S7, throwing ripraps to the upper portion of the mud surface of the vibroflotation cemented piles to form a riprap body of a cone structure, and then pouring underwater self-compacting concrete or underwater self-compacting cement mortar from the surface of the riprap body to the interior, so as to form a cemented riprap body.
The present invention has the following beneficial effects: 1.The present invention enables the soft soil stratum covering on the seabed foundation to be reinforced by vibroflotation cemented piles, remarkably raising the bearing capacity of the soft soil stratum, especially the horizontal bearing capacity, enhancing the applicability of the monopile base in the seabed of the shallow covering layer, avoiding the base form with higher costs of manufacture and more construction difficulty such as a high pile bearing platform, a guiding pipe frame and a rock-embedded pile, and reducing the total costs of manufacture of bases and construction.
2. For the vibroflotation cemented piles of the present invention, a vibroflotation flushing cemented pile body structure with water permeability and high-strength can be formed only by using a small amount of cement-based cementing materials, and the construction process of the vibroflotation cemented piles is simple, low in costs and high in speed.
3. Compared with a conventional monopile base of offshore wind power, of the monopile base with vibroflotation cemented piles for reinforcing soft foundations in the present invention, the pile diameter and the pile body anchoring depth are small, the horizontal bearing capacity is higher, and the pile body deformation or the mud surface corner is smaller, so that it can be suitable for offshore deep water wind power plants and wind turbines with larger capacity, effectively expanding the application scene for monopile bases.
4. The vibroflotation cemented piles also have an anti-scouring capacity, so that an anti-scouring structure does not need to be further arranged at the mud surface of the monopile base.
BRIEF DESCRIPTION OF THE DRAWINGS
We shall further describe the present invention with reference to the drawings and the embodiments as follows.
DESCRIPTION
FIG.1 shows a structure of the present invention.
FIG.2 is a top view of the present invention.
FIG.3 shows another structure of the present invention.
FIG.4 shows still another structure of the present invention.
FIG.5 shows still another structure of the present invention.
FIG.6 shows still another structure of the present invention.
FIG.7 shows an operation state of the present invention.
FIG.8 shows another operation state of the present invention.
FIG.9 shows still another operation state of the present invention.
FIG.10 is an enlarged view of the portion A in FIG. 7.
FIG. it is an enlarged view of the portion B in FIG. 7.
FIG.12 is an enlarged view of the portion C in FIG. 7.
Wherein, 1-monopile hole; 2-vibroflotation cemented piles; 21-inner ring pile; 22-outer ring pile; 23-branch piles; 24-middle ring piles; 25-broken stones; 26-underwater self-compacting cement-based cementing material; 3-cemented riprap body; 31-riprap; 32-underwater self-compacting mortar.
DETAILED DESCRIPTION OF SOME EMBODIMENTS
As shown in FIGs. V12, a monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations includes the vibroflotation cemented piles 2 composed of the inner ring pile 21 and the outer ring pile 22 positioned outside the inner ring pile 21, and the monopile hole 1 arranged at the center of the inner ring pile 21 and concentric with the centroids of the inner ring pile 21 and the outer ring pile 22. The pile body strength of the vibroflotation cemented piles decreases in sequence from the inside to the outside and from the upper portion to the lower portion of the monopile hole 1, respectively.
Preferably, the vibroflotation cemented piles 2 are arranged in the soft soil stratum and the bearing stratum near the monopile hole 1 to form a composite foundation of the vibroflotation cemented piles, enhancing the resistance capacity of the soil body near piles, effectively raising the horizontal bearing capacity of the monopile base, reducing the horizontal displacement of the top of the monopile base, improving the resistance to the foundation liquefaction of the monopile base, and improving the vibroflotation frequency of the monopile base and the tower.
Preferably, the monopile base with vibroflotation cemented piles for reinforcing soft foundations suitable for a sea area with a water depth of 30 -60 m and a seabed with a thin bearing stratum expends the prospect for its application in an offshore deep water area.
DESCRIPTION
In a preferred solution, a plurality of branch piles 23 arranged in the radial direction of the monopile hole 1 are installed between the inner ring pile 21 and the outer ring pile 22. At the formation of a pile, the branch piles are connected between the inner ring pile and the outer ring pile to form an integral structure.
In a preferred solution, at least one middle ring pile 24 is arranged between the inner ring pile 21 and the outer ring pile 22, and the centroids of the middle ring piles 24 are concentric with the monopile hole 1. At the formation of a pile, the inner ring pile is positioned outside the monopile, the outer ring pile is positioned outside the inner ring pile, and the middle ring piles are positioned and connected between the inner ring pile and the outer ring pile to form an integral structure.
In a preferred solution, the inner ring pile 21, the outer ring pile 22, the branch piles 23 and the middle ring piles 24 are all composed of a plurality of vibroflotation cemented piles. The inner ring pile 21, the outer ring pile 22, the branch piles 23 and the middle ring piles 24 are formed by means of vibroflotation of only one vibroflot, with a high equipment utilization rate, low equipment investment, and high construction efficiency.
In a preferred solution, the inner ring pile 21, the outer ring pile 22 and the middle ring piles 24 are of a circular structure composed of a plurality of vibroflotation cemented piles; and the branch piles 23 are of a linear structure composed of a plurality of vibroflotation cemented piles. The inner ring pile 21_ is in contact with the monopile, the outer ring pile 22, the middle ring piles 24 and the branch piles 23 further improve the overall structural strength and stability.
In a preferred solution, the heights of the inner ring pile 21, the middle ring piles 24 and the outer ring pile 22 decrease in sequence to form the vibroflotation cemented piles 2 with a conical structure, one end of which with a small cross section faces downwards. Of the monopile base with a conical structure, the end with a smaller cross section faces downwards, so that the overall structural strength increases in sequence from the bearing stratum to the soft soil stratum.
In a preferred solution, the vibroflotation cemented piles comprise a columnar body formed by means of cementation of broken stones 25 and underwater self-compacting cement-based cementing material 26. The vibrotlotation made by a vibroflot forms an initial hole, then a conveying system conveys broken stones to the bottom of the vibroflot, and the vibroflotation with feeding enables formation of a broken stone pile body. Meanwhile, the underwater self-compacting cement-based cementing material is conveyed to the bottom of a vibroflot guiding pipe through conveying pipes, then flows downwards along the gaps of the
DESCRIPTION
broken stone pile body, and the vibroflotation along with feeding and cementing enables formation of a cemented broken stone body, next the vibroflot gradually lifts upwards to repeat the construction process of the vibroflotation along with feeding and cementing until forming vibroflotation cemented piles. Alternatively, the vibroflotation made by a vibroflot forms an initial hole, then a conveying system conveys broken stones to the bottom of the vibroflot, and the vibroflotation with feeding first enables formation of a broken stone pile body on the initial hole, after the broken stone pile body reaches the designed height, then the vibrotlotation with feeding stops, next an underwater self-compacting cement-based cementing material is poured into the broken stone pile body. The underwater self-compacting cement-based cementing material flows downwards along the gaps of the broken stone pile body to form a bottom cemented broken stone body, then the vibroflotation with feeding continues to form a middle broken stone body, next an underwater self-compacting cement-based cementing material is poured to form a middle cemented broken stone body. Thus, the above process repeats itself until a vibration cemented pile is formed.
Preferably, a cement-based slurry is pressed into the soil body between the inner ring pile and the monopile by means of a grouting device to form solidified soil, through which the inner ring pile 21 is connected with the monopile hole 1 so as to enable load transmission between the monopile hole 1 and the inner ring pile 21.
Preferably, the underwater self-compacting cement-based cementing material flows downwards along the broken stone gaps of the broken stone pile body under the function of gravity or external pressure, and a part of the cementing material adheres to or is deposited in the broken stone joints or the broken stone gaps in the flowing process. The cement-based cementing material is cemented with broken stone particles under the function of hydration, so as to form a cemented broken stone pile body with water-permeability and high-strength. The vibroflotation cemented piles serve as a drainage channel of the soft soil stratum, and effectively accelerate the drainage and consolidation of the soft soil foundation.
Preferably, the cementing effect of the underwater self-compacting cement-based cementing material remarkably improves the shearing strength of the broken stone pile body, so that the vibroflotation cemented pile body has the capability of bearing the horizontal load.
Preferably, the inner ring pile is in contact or connection with the monopile, so as to improve the friction effect of the monopile between the soil bodies near piles, and further raise the horizontal bearing capacity and the axial bearing capacity of the monopile base.
Preferably, the vibroflotation cemented piles adopt broken stones with particle sizes of
DESCRIPTION
2-10cm, and the underwater self-compacting cement-based cementing material adopts underwater self-compacting cement paste or underwater self-compacting cement mortar.
Preferably, the pile body of the vibroflotation cemented piles is formed by one time or multiple times so as to meet the requirements of different foundation reinforcing depths and pile body material strength.
Preferably, the formation of the broken stone pile body and the perfusion of the underwater self-compacting cement-based cementing material are implemented step by step, that is, first, form the stone broken pile body by means of vibroflotation, then, release the prepared underwater protective agent solution at the broken stone pile body, finally, pour the underwater self-compacting cement-based cementing material into the broken pile body. The release process of the underwater protective agent solution is synchronous with the pouring process of the underwater self-compacting cement-based cementing material, and the underwater protective agent is used for maintaining the non-dispersity of the underwater self-compacting cement-based cementing material in seawater and keeping the flowing performance of the cementing material.
Preferably, the formation of the broken stone pile body and the perfusion of the underwater self-compacting cement-based cementing material are implemented synchronously, that is, convey the broken stones into a hole at the bottom of the guiding pipe of the vibrotlot through a discharging pipeline under the function of the high-pressure water of the mixed underwater protective agent, and synchronously convey the underwater self-compacting cement-based cementing material to the surface of the broken stone pile body, thus, the vibroflotation along with feeding and cementing enables the formation of the cemented broken stone pile body.
Preferably, the formation of the broken stone pile body and the perfusion of the underwater self-compacting cement-based cementing material are implemented synchronously, that is, convey the broken stones into a hole at the bottom of the guiding pipe of the vibroflot through a discharging pipeline under the function of high pressure air, and synchronously convey the underwater self-compacting cement-based cementing material and the underwater protective agent to the surface of the broken stone pile body, thus, the vibroflotation along with feeding and cementing enables the formation of the cemented broken stone pile body.
In a preferred solution, a cemented riprap body 3 is arranged on the upper portion of the vibroflotation cemented piles 2, the cemented riprap body 3 is of a cone structure, the end of which with a small cross section faces upwards. The cemented riprap body arranged around
DESCRIPTION
the monopile on the mud surface of the upper portion of the vibroflotation cemented piles remarkably enhances the anti-scouring capacity of the monopile base without necessity to be additionally provided with an anti-scouring structure, decreasing investment and reducing costs.
In a preferred solution, the cemented riprap body 3 is formed by ripraps 31 and underwater self-compacting mortar 32, that is, throw the ripraps to the upper portion of the mud surface of the vibrotlotation cemented piles to form a riprap body of a cone structure, and then pour underwater self-compacting concrete or underwater self-compacting cement mortar from the surface of the riprap body to the interior, so as to form a cemented riprap body.
In a preferred solution, a construction method of the monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations as above, the method comprising the following steps.
Si, making piling, drive a monopile vertically downwards into a seabed along a monopile hole 1 by means of pile-driving equipment up to a designed depth, and the lower end of the monopile penetrating through a soft soil stratum to extend into a bearing stratum of the seabed; S2, formation of inner ring pile, which includes the following sub steps: S2-1, vibroflotation made by a vibroflot forming an initial hole, then a conveying system conveying broken stones 25 to the bottom of the vibroflot, and the vibroflotation with feeding enabling formation of a broken stone pile body, meanwhile, an underwater self-compacting cement-based cementing material 26 being conveyed to the bottom of a vibroflot guiding pipe through a conveying pipe, then the underwater self-compacting cement-based cementing material 26 flowing downwards along the gaps of the broken stone pile body, and the vibroflotation along with feeding and cementing enabling formation of a cemented broken stone body, and S2-2, the initial hole in 52-1 being positioned outside the monopile hole 1, and in the process that the vibroflot gradually rises upwards along the initial hole, continuously repeating 52, so as to form inner ring pile 21 outside the monopile hole 1; S3, formation of a middle ring piles, the initial hole being positioned outside the inner ring pile 21, repeating 52-1 and S2-2 along the initial hole in sequence so as to form a middle ring piles 24 outside the inner ring pile 21; S4, formation of an outer ring pile, the initial hole being positioned outside the middle ring piles 24, repeating S2-1 and S2-2 along the initial hole in sequence so as to form an outer
DESCRIPTION
ring pile 22 outside the middle ring piles 24; S5, forming a branch piles, the initial hole being positioned inside the outer ring pile 22 or outside the inner ring pile 21, repeating S2-1 and S2-2 in sequence so as to form a branch piles 23; wherein the inner ring pile, the middle ring piles, the outer ring pile and an inter-pile soil body are combined to form a composite foundation of vibroflotation cemented piles, or the inner ring pile, the outer ring pile, the branch piles and an inter-pile soil body are combined to form a composite foundation of vibrotlotation cemented piles; thus, of the vibroflotation cemented piles, the lower ends extend into the bearing stratum of the seabed, and the upper ends are positioned in the soft soil stratum of the seabed; SG, filling, pressing a cement-based slurry into the soil body between the inner ring pile 21 and the monopile by means of a grouting device to form solidified soil, through which the inner ring pile 21 is connected with the monopile; and S7, throwing ripraps 31 to the upper portion of the mud surface of the vibroflotation cemented piles 2 to form a riprap body of a cone structure, and then pouring underwater self-compacting concrete or underwater self-compacting cement mortar from the surface of the riprap body to the interior, so as to form a cemented riprap body 3.
The above embodiments are only preferred technical solutions of the present invention, and should not be regarded as limiting the present invention. The embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other without conflict. The scope of protection of the present invention shall be the technical solutions recorded in the claims, including the equivalent alternatives of the technical features in the technical solutions recorded in the claims. Equivalent substitutions and improvements in the scope are also included in the scope of protection of the present invention.
Claims (10)
- CLAIMWhat is claimed is: 1. A monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations, comprising vibroflotation cemented piles (2) composed of inner ring pile (21) and outer ring pile (22) positioned outside said inner ring pile (21), a monopile hole (1) arranged at the center of said inner ring pile (21) and concentric with the centroids of said inner ring pile (21) and said outer ring pile (22), and the pile body strength of said vibroflotation cemented piles (2) decreasing in sequence from the inside to the outside and from the upper portion to lower portion of said monopile hole (I), respectively.
- 2. The monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 1, wherein a plurality of branch piles (23) arranged in the radial direction of said monopile hole (I) are installed between said inner ring pile (21) and said outer ring pile (22).
- 3. The monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 1, wherein at least one middle ring pile (24) is arranged between said inner ring pile (21) and said outer ring pile (22), and the centroids of said middle ring piles (24) are concentric with said monopile hole (1).
- 4. The monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 1, wherein said inner ring pile (21), said outer ring pile (22), said branch piles (23) and said middle ring piles (24) are all composed of a plurality of vibroflotation cemented piles.
- 5. The monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 1, wherein said inner ring pile (21), said outer ring pile (22) and said middle ring piles (24) are of a circular structure composed of a plurality of vibroflotation cemented piles; and said branch piles (23) are of a linear structure composed of a plurality of vibroflotation cemented piles.
- 6. The monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 1, wherein the heights of said inner ring pile (21), said middle ring piles (24) and said outer ring pile (22) decrease in sequence to form said vibroflotation cemented piles (2) with a conical structure, one end of which with a small cross section faces downwards.
- 7. The monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 5, wherein said vibroflotation cemented piles (2) include a columnar body formed by means of cementation of broken stones (25)CLAIMand underwater self-compacting cement-based cementing material (26).
- 8. The monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 1, wherein a cemented riprap body (3) is arranged on the upper portion of said vibroflotation cemented piles (2), and said cemented riprap body (3) is of a cone structure, the end of which with a small cross section faces upwards.
- 9. the monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to claim 8, wherein said cemented riprap body (3) is formed by ripraps (31) and underwater self-compacting mortar (32).
- 10. A construction method of said monopile base with vibroflotation cemented piles of offshore wind power for reinforcing soft foundations according to any one of claims 1-9, said method comprising the following steps: Si, making piling, drive a monopile vertically downwards into a seabed along a monopile hole (1) by means of pile-driving equipment up to a designed depth, and the lower end of said monopile penetrating through a soft soil stratum to extend into a bearing stratum of said seabed; S2, formation of inner ring pile, which includes the following sub steps: S2-1, vibroflotation made by a vibroflot forming an initial hole, then a conveying system conveying broken stones (25) to the bottom of said vibroflot, and the vibroflotation with feeding enabling formation of a broken stone pile body, meanwhile, an underwater self-compacting cement-based cementing material (26) being conveyed to the bottom of a vibroflot guiding pipe through a conveying pipe, then said underwater self-compacting cement-based cementing material (26) flowing downwards along the gaps of said broken stone pile body, and the vibroflotation along with feeding and cementing enabling formation of a cemented broken stone body; and S2-2, said initial hole in S2-1 being positioned outside said monopile hole (1), and in the process that said vibroflot gradually rises upwards along said initial hole, continuously repeating S2, so as to form inner ring pile (21) outside said monopile hole (1); S3, formation of a middle ring piles, said initial hole being positioned outside said inner ring pile (21), repeating S2-1 and S2-2 along said initial hole in sequence so as to form a middle ring piles (24) outside said inner ring pile (21); S4, formation of an outer ring pile, said initial hole being positioned outside said middle ring piles (24), repeating S2-1 and S2-2 along said initial hole in sequence so as toCLAIMform an outer ring pile (22) outside said middle ring piles (24); S5, forming a branch piles, said initial hole being positioned inside said outer ring pile (22) or outside said inner ring pile (21), repeating S2-1 and S2-2 in sequence so as to form a branch piles (23); wherein said inner ring pile, said middle ring piles, said outer ring pile and an inter-pile soil body are combined to form a composite foundation of vibroflotation cemented piles, or said inner ring pile, said outer ring pile, said branch piles and an inter-pile soil body are combined to form a composite foundation of vibroflotation cemented piles; thus, of said vibroflotation cemented piles, the lower ends extend into said bearing stratum of said seabed, and the upper ends are positioned in said soft soil stratum of said seabed; S6, filling, pressing a cement-based slurry into the soil body between said inner ring pile (21) and said monopile by means of a grouting device to form solidified soil, through which said inner ring pile (21) is connected with said monopile; and S7, throwing ripraps (31) to the upper portion of the mud surface of said vibroflotation cemented piles (2) to form a riprap body of a cone structure, and then pouring underwater self-compacting concrete or underwater self-compacting cement mortar from the surface of said riprap body to the interior, so as to form a cemented riprap body (3).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120491100.4U CN214657189U (en) | 2021-03-08 | 2021-03-08 | Single pile foundation for reinforcing soft soil foundation by offshore wind power vibroflotation cemented pile |
| CN202110251975.1A CN112922019A (en) | 2021-03-08 | 2021-03-08 | Single-pile foundation for reinforcing soft soil foundation by offshore wind power vibroflotation cemented pile and construction method |
| PCT/CN2021/115496 WO2022037707A1 (en) | 2021-03-08 | 2021-08-31 | Monopile foundation using cemented vibroflotation pile to reinforce soft soil foundation for use in offshore wind power generation, and construction method |
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| Publication Number | Publication Date |
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| GB202216354D0 GB202216354D0 (en) | 2022-12-21 |
| GB2609841A true GB2609841A (en) | 2023-02-15 |
| GB2609841B GB2609841B (en) | 2024-04-03 |
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| GB2216354.7A Active GB2609841B (en) | 2021-03-08 | 2021-08-31 | Monopile foundation using cemented vibroflotation pile to reinforce soft soil foundation for use in offshore wind power generation, and construction method |
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| Country | Link |
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| DE (1) | DE112021001464T5 (en) |
| GB (1) | GB2609841B (en) |
| WO (1) | WO2022037707A1 (en) |
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| CN114991221A (en) * | 2022-04-22 | 2022-09-02 | 华能灌云清洁能源发电有限责任公司 | Novel stone throwing shaft collar protective structure's offshore wind power pile foundation |
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- 2021-08-31 WO PCT/CN2021/115496 patent/WO2022037707A1/en active Application Filing
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- 2021-08-31 DE DE112021001464.1T patent/DE112021001464T5/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| GB202216354D0 (en) | 2022-12-21 |
| WO2022037707A1 (en) | 2022-02-24 |
| GB2609841B (en) | 2024-04-03 |
| DE112021001464T5 (en) | 2023-02-02 |
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