CN112922019A - Single-pile foundation for reinforcing soft soil foundation by offshore wind power vibroflotation cemented pile and construction method - Google Patents
Single-pile foundation for reinforcing soft soil foundation by offshore wind power vibroflotation cemented pile and construction method Download PDFInfo
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- CN112922019A CN112922019A CN202110251975.1A CN202110251975A CN112922019A CN 112922019 A CN112922019 A CN 112922019A CN 202110251975 A CN202110251975 A CN 202110251975A CN 112922019 A CN112922019 A CN 112922019A
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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
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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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
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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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
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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
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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
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
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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
- F03D13/22—Foundations specially adapted for wind motors
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/1607—Shapes round, e.g. circle
- E02D2200/1621—Shapes round, e.g. circle made from multiple elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
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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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- 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 single pile foundation of a marine wind power vibroflotation cemented pile reinforced soft soil foundation and a construction method are disclosed, the vibroflotation cemented pile is arranged around the single pile, the vibroflotation cemented pile is formed in a seabed soft soil layer and a bearing layer by a construction method combining a deep sea gravel pile vibroflotation pile forming process and an underwater self-compaction cement-based cementing material self-flow grouting process, the vibroflotation cemented pile and a soil body between the vibroflotation cemented pile form a vibroflotation cemented pile composite foundation, and the pile body strength of the vibroflotation cemented pile in the composite foundation sequentially increases from an outer ring to an inner ring and sequentially decreases from an upper part to a lower part. The vibroflotation cemented pile effectively improves the bearing capacity of a soft soil layer, expands the applicability of a single pile foundation in a shallow covering layer seabed and an offshore deep water wind power plant, simultaneously does not need to additionally arrange an anti-scouring structure, and has the characteristics of low foundation manufacturing cost and construction cost, high construction efficiency and simple and convenient operation.
Description
Technical Field
The invention belongs to the technical field of pile foundations of ocean engineering, and relates to a single pile foundation for reinforcing a soft soil foundation by using an offshore wind power vibroflotation cemented pile and a construction method.
Background
Offshore wind power has the advantages of cleanness and high efficiency, and is an important development direction in the field of new energy. At present, the offshore wind power single-pile foundation has the advantages of high construction speed, low engineering cost, strong foundation applicability and the like, and the proportion of the offshore wind power single-pile foundation in the installed foundation exceeds 80 percent. With the gradual trend of offshore wind power plants from shallow offshore areas to deep offshore areas and deep open sea and the continuous increase of the capacity of wind generating sets, the single-pile foundation needs to provide larger horizontal bearing capacity. However, the surface layer of the sea bed in part of the sea area in China is deep soft soil, the bearing layer below the soft soil layer is relatively thin, and if a conventional single-pile foundation is adopted, the soil body around the pile cannot provide horizontal resistance meeting the design requirement; if the foundation forms such as the jacket, the rock-socketed pile and the like are adopted, on one hand, the foundation cost is greatly improved, and on the other hand, the construction period is obviously prolonged. Therefore, the development of the single pile foundation which is suitable for the soft soil foundation and has higher horizontal bearing capacity has important engineering application value.
Disclosure of Invention
The invention aims to solve the technical problem of providing a single pile foundation of an offshore wind power vibroflotation cemented pile reinforced soft soil foundation and a construction method, wherein the single pile foundation is simple in structure, vibroflotation cemented piles are distributed in soil bodies around the single pile, the vibroflotation cemented piles are positioned in a supporting layer and a soft soil layer of a seabed, and the vibroflotation cemented piles and soil bodies among the piles form a vibroflotation cemented pile composite foundation, so that the bearing capacity of the soft soil layer is improved, the horizontal bearing capacity of the single pile foundation is effectively improved, the deformation resistance of the soil bodies around the piles is obviously enhanced, the horizontal displacement of the top of the single pile foundation is reduced, the foundation liquefaction resistance of the single pile foundation is improved, and the vibration frequency of the single pile foundation and an upper structure of the single pile foundation is improved. Meanwhile, the single-pile foundation for reinforcing the soft soil foundation by the offshore wind power vibroflotation cemented pile can be suitable for the sea area with the water depth of 30-60m and the seabed with a thin bearing layer, and the application prospect of the single-pile foundation in the offshore deep water area is expanded.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a single pile foundation for reinforcing a soft soil foundation by using an offshore wind power vibroflotation cemented pile comprises a vibroflotation cemented pile; the vibroflotation cemented pile comprises an inner ring pile and an outer ring pile; the outer ring pile is positioned outside the inner ring pile; a single pile hole is formed in the center of the inner ring pile; the single pile hole is concentric with the annular centers of the inner ring pile and the outer ring pile; the pile body strength of the vibroflotation cemented pile is gradually decreased from the inside to the outside of the single pile hole, and the pile body strength of the vibroflotation cemented pile is gradually decreased from the upper part of the single pile hole to the lower part.
And a plurality of branch piles distributed along the radial direction of the single pile hole are arranged 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 ring center of the middle ring pile is concentric with the single pile hole.
The inner ring pile, the outer ring pile, the branch pile and the middle ring pile are all composed of a plurality of vibroflotation cemented piles.
The inner ring pile, the outer ring pile and the middle ring pile are of a circular structure formed by a plurality of vibroflotation cemented piles; the branch pile is a linear structure formed by a plurality of vibroflotation cemented piles.
The heights of the inner ring pile, the middle ring pile and the outer ring pile are sequentially reduced to form the vibroflotation cemented pile with a conical structure, and one end with a smaller cross section faces downwards.
The vibroflotation cemented pile comprises a columnar body cemented with gravels and an underwater self-compaction cement-based cementing material.
The upper portion of vibroflotation cemented pile sets up the cementation riprap body, and the cementation riprap body is the cone structure, and the one end that the cross-section is less is up.
The cemented riprap body is formed by cementing riprap and underwater self-compacting mortar.
The construction method of the single pile foundation for reinforcing the soft soil foundation by the offshore wind power vibroflotation cemented pile comprises the following steps:
s1, piling, namely, vertically driving a single pile downwards into the seabed along a single pile hole by adopting pile sinking equipment until the design depth is reached, wherein the lower end of the single pile penetrates through the soft soil layer and goes deep into a bearing layer of the seabed;
s2, forming the inner ring pile into a pile,
s2-1, vibroflotation equipment is adopted to vibroflotation form an initial hole, then a conveying system conveys broken stones (25) to the bottom of a vibroflotation device, vibroflotation and feeding are carried out simultaneously to form a broken stone pile body, meanwhile, an underwater self-compacting cement-based cementing material is conveyed to the bottom of a duct of the vibroflotation device through a conveying pipe, the underwater self-compacting cement-based cementing material flows downwards along a broken stone gap of the broken stone pile body, and cementing broken stone pile bodies are formed by vibroflotation, feeding and cementing simultaneously;
the initial hole in the S2-2 and S2-1 is positioned outside the single pile hole, and the S2-1 is continuously repeated in the process that the vibrator is gradually lifted upwards along the initial hole, so that an inner ring pile is formed outside the single pile hole;
s3, forming a middle ring pile, wherein the initial hole is positioned outside the inner ring pile, and S2-1 and S2-2 are repeated along the initial hole in sequence to form the middle ring pile outside the inner ring pile;
s4, forming an outer ring pile, wherein the initial hole is positioned outside the middle ring pile, and the steps S2-1 and S2-2 are repeated along the initial hole in sequence to form the outer ring pile outside the middle ring pile;
s5, forming a branch pile, wherein the initial hole is positioned on the inner side of the outer ring pile or the outer side of the inner ring pile, and the steps of S2-1 and S2-2 are repeated in sequence to form the branch pile;
the inner ring piles, the middle ring piles, the outer ring piles and the soil among the piles are combined to form a vibroflotation cemented pile composite foundation, or the inner ring piles, the outer ring piles, the branch piles and the soil among the piles are combined to form a vibroflotation cemented pile composite foundation; at the moment, the lower end of the vibroflotation cemented pile extends into a seabed bearing stratum, and the upper end of the vibroflotation cemented pile is positioned in a seabed soft soil layer;
s6, filling, namely pressing cement-based grout into a soil body between the inner ring pile and the single pile by using grouting equipment to form solidified soil, and connecting the inner ring pile with the single pile;
s7, throwing the riprap to the upper part of the mud surface of the vibroflotation cemented pile to form a riprap body with a cone structure, and pouring underwater self-compacting concrete or underwater self-compacting cement mortar into the riprap body from the surface of the riprap body to form a cemented riprap body.
The invention has the following beneficial effects:
1. the invention strengthens the soft soil layer on the seabed foundation by the vibroflotation cemented pile, obviously improves the bearing capacity of the soft soil layer, particularly the horizontal bearing capacity, enhances the applicability of the single pile foundation in the seabed of the shallow covering layer, avoids adopting foundation forms such as a high pile cap, a jacket, an embedded rock pile and the like with higher manufacturing cost and more construction difficulty, and reduces the total cost of foundation manufacture and construction.
2. The vibroflotation cemented pile can form a vibroflotation cemented pile body structure with water permeability and high strength by only using a small amount of cement-based cementing materials, and has simple construction process, low cost and high speed.
3. Compared with the conventional single-pile foundation of offshore wind power, the single-pile foundation of the vibroflotation cemented pile reinforced soft soil foundation has smaller pile diameter and pile body anchoring depth, higher horizontal bearing capacity and smaller pile body deformation or mud surface corner, so that the vibroflotation cemented pile reinforced soft soil foundation can be suitable for offshore deep water wind power plants and fans with larger capacity, and the application scene of the single-pile foundation is effectively expanded.
4. The vibroflotation cemented pile has the anti-scouring capability, so that an anti-scouring structure is not required to be additionally arranged at the mud surface of the single pile foundation.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic top view of the present invention.
Fig. 3 is another schematic structural diagram of the present invention.
Fig. 4 is another schematic structural diagram of the present invention.
Fig. 5 is another schematic structure of the present invention.
Fig. 6 is another schematic structure of the present invention.
Fig. 7 is a state diagram of the present invention in use.
Fig. 8 is another state diagram of the present invention.
Fig. 9 is another state diagram of the present invention.
Fig. 10 is an enlarged schematic view of a portion a of fig. 7.
Fig. 11 is an enlarged schematic view of fig. 8 at B.
Fig. 12 is an enlarged schematic view of fig. 8 at C.
In the figure: the method comprises the following steps of single pile hole 1, vibroflotation cemented pile 2, inner ring pile 21, outer ring pile 22, branch pile 23, middle ring pile 24, broken stone 25, underwater self-compaction cement-based cementing material 26, cemented riprap body 3, riprap 31 and underwater self-compaction mortar 32.
Detailed Description
As shown in fig. 1 to 12, a single pile foundation for reinforcing a soft soil foundation by an offshore wind power vibroflotation cemented pile comprises a vibroflotation cemented pile 2; the vibroflotation cemented pile 2 comprises an inner ring pile 21 and an outer ring pile 22; the outer ring pile 22 is positioned outside the inner ring pile 21; a single pile hole 1 is arranged at the center in the inner ring pile 21; the single pile hole 1 is concentric with the centroids of the inner ring pile 21 and the outer ring pile 22; the pile body strength of the vibroflotation cemented pile is gradually decreased from the inside to the outside of the single pile hole 1, and the pile body strength of the vibroflotation cemented pile is gradually decreased from the upper part to the lower part of the single pile hole 1. .
Preferably, the vibroflotation cemented pile 2 is arranged on a soft soil layer and a bearing layer around the single pile hole 1 to form a vibroflotation cemented pile composite foundation, so that the resistance of soil around the pile is enhanced, the horizontal bearing capacity of the single pile foundation is effectively improved, the horizontal displacement of the pile top of the single pile foundation is reduced, the foundation liquefaction resistance of the single pile foundation is improved, and the vibration frequency of the single pile foundation and a tower barrel is improved.
Preferably, the single-pile foundation of the vibroflotation cemented pile reinforced soft soil foundation can be suitable for the sea area with the water depth of 30-60m and the seabed with a thin bearing layer, and the application prospect of the single-pile foundation in the offshore deep water area is expanded.
In a preferred scheme, a plurality of branch piles 23 arranged along the radial direction of the single pile hole 1 are arranged between the inner ring pile 21 and the outer ring pile 22. When the pile is formed, the inner ring pile and the outer ring pile are connected by the branch pile to form an integral structure.
In a preferred scheme, at least one middle ring pile 24 is arranged between the inner ring pile 21 and the outer ring pile 22, and the centroid of the middle ring pile 24 is concentric with the single pile hole 1. When the pile is formed, the inner ring pile is positioned outside the single pile, the outer ring pile is positioned outside the inner ring pile, and the middle ring pile is positioned between the inner ring pile and the outer ring pile and connected with each other to form an integral structure.
In a preferred scheme, the inner ring piles 21, the outer ring piles 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 pile 23 and the middle ring pile 24 are formed by vibroflotation of the same vibroflotation equipment, so that the utilization rate of the equipment is high, the equipment investment is reduced, and the construction efficiency is improved.
In a preferred scheme, the inner ring piles 21, the outer ring piles 22 and the middle ring piles 24 are circular structures formed by a plurality of vibroflotation cemented piles; the branch piles 23 are linear structures formed by a plurality of vibroflotation cemented piles. The inner ring piles 21 are in contact with the mono-piles, and the outer ring piles 22, the middle ring piles 24 and the branch piles 23 further improve the overall structural strength and stability.
In a preferred scheme, the heights of the inner ring piles 21, the middle ring piles 24 and the outer ring piles 22 are sequentially reduced to form the vibroflotation cemented pile 2 with a conical structure, and one end with a smaller cross section faces downwards. The single pile foundation of toper structure, the less one end in cross-section is down, increases overall structure intensity from the bearing layer to soft soil layer in proper order.
In a preferred scheme, the vibroflotation cementing pile comprises a columnar body formed by cementing gravel 25 and an underwater self-compaction cement-based cementing material 26. Adopt and shake towards equipment vibroflotation and form initial hole, conveying system carries the rubble to the bumper shock absorber bottom afterwards, shake towards the while feed and form rubble pile body, meanwhile, carry self-compaction cement based cementitious material under water to bumper shock absorber pipe bottom through the conveyer pipe, self-compaction cement based cementitious material flows down along the rubble clearance of rubble pile body under water, shake towards while, the while feed, the while cementing forms the cemented rubble pile body, the vibrator upwards promotes gradually, the repeated while shakes towards, the while feed, the while cementated work progress is until forming and shakes towards cemented pile. Or, adopting vibroflotation equipment to vibroflotation to form an initial hole, then conveying broken stones to the bottom of a vibroflotation device by a conveying system, feeding and vibroflotation simultaneously, forming a broken stone pile body in the initial hole, stopping vibroflotation and feeding when the broken stone pile body reaches the designed height, pouring an underwater self-compaction cement-based cementing material into the broken stone pile body, enabling the underwater self-compaction cement-based cementing material to flow downwards along the broken stone gap of the broken stone pile body to form a bottom cemented broken stone pile body, continuing vibroflotation and feeding to form a middle broken stone pile body, pouring the underwater self-compaction cement-based cementing material again to form a middle cemented broken stone pile body, and repeating the processes until the cemented pile is formed.
Preferably, the cement-based grout is pressed into the soil between the inner ring pile and the single pile by using a grouting device to form solidified soil, and the solidified soil connects the inner ring pile 21 with the single pile hole 1, so that the load transmission between the single pile hole 1 and the inner ring pile 21 is realized.
Preferably, the underwater self-compaction cement-based cementing material flows downwards along the gravel gaps of the gravel pile body under gravity or external pressure, part of the cementing material is attached to or deposited on gravel contact points or gravel gaps in the flowing process, the cement-based cementing material bonds gravel particles through hydration to form a cemented gravel pile body with water permeability and high strength, and the vibroflotation cemented pile is used as a drainage channel of a soft soil layer to effectively accelerate drainage consolidation of the soft soil foundation.
Preferably, the cementing effect of the underwater self-compacting cement-based cementing material obviously improves the shear strength of the gravel pile body, so that the vibroflotation cementing pile body has the capacity of bearing horizontal load.
Preferably, the inner ring pile is in contact with or connected with the single pile, so that the friction effect between the single pile and the soil body around the pile is improved, and the horizontal bearing capacity and the axial bearing capacity of the single pile foundation are further improved.
Preferably, the vibroflotation cemented pile adopts gravels with the particle size of 2-10 cm, and the underwater self-compaction cement-based cementing material adopts underwater self-compaction cement paste or underwater self-compaction cement mortar.
Preferably, the pile body of the vibroflotation cemented pile is formed once or for multiple times so as to meet the requirements of different foundation reinforcement depths and pile body material strengths.
Preferably, the gravel pile body forming and the underwater self-compaction cement-based cementing material pouring distribution construction are carried out, the gravel pile body is formed by vibroflotation, then the prepared underwater protective agent solution is put into the gravel pile body, and finally the underwater self-compaction cement-based cementing material is poured into the gravel pile body. The putting 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 protecting the non-dispersibility of the underwater self-compacting cement-based cementing material in seawater and keeping the flowing property of the cementing material.
Preferably, the gravel pile body forming and the underwater self-compaction cement-based cementing material pouring are synchronously constructed, the gravel is conveyed into a hole in the bottom of the vibroflot guide pipe through a blanking pipeline by using high-pressure water mixed with an underwater protective agent, the underwater self-compaction cement-based cementing material is synchronously conveyed to the upper surface of the gravel pile body, and the cementing gravel pile body is formed by vibroflot, feeding and cementing.
Preferably, the gravel pile body forming and the underwater self-compaction cement-based cementing material pouring are synchronously constructed, the gravel is conveyed into a hole in the bottom of the vibroflot guide pipe through a blanking pipeline by utilizing high-pressure air, the underwater protective agent solution and the underwater self-compaction cement-based cementing material are synchronously conveyed to the upper surface of the gravel pile body, and the cementing gravel pile body is formed by vibroflot, feeding and cementing.
In the preferred scheme, the upper part of the vibroflotation cemented pile 2 is provided with a cemented riprap body 3, the cemented riprap body 3 is of a cone structure, and one end with a smaller cross section faces upwards. The cemented riprap body arranged on the upper mud surface of the vibroflotation cemented pile around the single pile obviously enhances the anti-scouring capability of the single pile foundation, and an anti-scouring structure is not required to be additionally arranged, so that the investment is reduced, and the cost is reduced.
In a preferred scheme, the cemented riprap body 3 is formed by cementing riprap 31 and underwater self-compacting mortar 32. Throwing the riprap to the upper part of the mud surface of the vibroflotation cemented pile to form a riprap body with a cone structure, and pouring underwater self-compaction concrete or underwater self-compaction cement mortar from the surface of the riprap body to the inside to form the cemented riprap body.
In a preferred embodiment, the method for constructing the single-pile foundation of the offshore wind power vibroflotation cemented pile reinforced soft soil foundation comprises the following steps:
s1, piling, namely, vertically driving a single pile downwards into the seabed along the single pile hole 1 by adopting pile sinking equipment until the designed depth is reached, wherein the lower end of the single pile penetrates through the soft soil layer and goes deep into the bearing layer of the seabed;
s2, forming the inner ring pile into a pile,
s2-1, vibroflotation equipment is adopted to vibroflotation form an initial hole, then a conveying system conveys crushed stone 25 to the bottom of a vibroflotation device, vibroflotation and feeding are carried out simultaneously to form a crushed stone pile body, meanwhile, an underwater self-compacting cement-based cementing material 26 is conveyed to the bottom of a guide pipe of the vibroflotation device through a conveying pipe, the underwater self-compacting cement-based cementing material 26 flows downwards along a crushed stone gap of the crushed stone pile body, and a cemented crushed stone pile body is formed by vibroflotation, feeding and cementing simultaneously;
the initial hole in the S2-2 and S2-1 is positioned outside the single pile hole 1, and in the process that the vibrator is gradually lifted upwards along the initial hole, the S2-1 is continuously repeated, and an inner ring pile 21 is formed outside the single pile hole 1;
s3, forming a middle ring pile, wherein the initial hole is positioned outside the inner ring pile 21, S2-1 and S2-2 are repeated along the initial hole in sequence, and the middle ring pile 24 is formed outside the inner ring pile 21;
s4, forming an outer ring pile, wherein the initial hole is positioned outside the middle ring pile 24, and the steps S2-1 and S2-2 are repeated along the initial hole in sequence to form the outer ring pile 22 outside the middle ring pile 24;
s5, forming a branch pile, wherein the initial hole is positioned on the inner side of the outer ring pile 22 or the outer side of the inner ring pile 21, and the steps of S2-1 and S2-2 are repeated in sequence to form the branch pile 23;
the inner ring piles, the middle ring piles, the outer ring piles and the soil among the piles are combined to form a vibroflotation cemented pile composite foundation, or the inner ring piles, the outer ring piles, the branch piles and the soil among the piles are combined to form a vibroflotation cemented pile composite foundation; at the moment, the lower end of the vibroflotation cemented pile extends into a seabed bearing stratum, and the upper end of the vibroflotation cemented pile is positioned in a seabed soft soil layer;
s6, filling, namely pressing cement-based grout into a soil body between the inner ring pile 21 and the single pile 1 by using grouting equipment to form solidified soil, and connecting the inner ring pile 21 and the single pile;
s7, throwing the riprap 31 to the upper part of the mud surface of the vibroflotation cemented pile 2 to form a riprap body with a cone structure, and pouring underwater self-compacting concrete or underwater self-compacting cement mortar into the riprap body from the surface of the riprap body to form a cemented riprap body 3.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. A single pile foundation of a soft soil foundation reinforced by an offshore wind power vibroflotation cemented pile is characterized in that: it comprises a vibroflotation cemented pile (2); the vibroflotation cemented pile (2) comprises an inner ring pile (21) and an outer ring pile (22); the outer ring pile (22) is positioned outside the inner ring pile (21); a single pile hole (1) is arranged at the center in the inner ring pile (21); the single pile hole (1) is concentric with the annular centers of the inner ring pile (21) and the outer ring pile (22); the pile body strength of the vibroflotation cemented pile is gradually decreased from the inside to the outside of the single pile hole (1), and the pile body strength of the vibroflotation cemented pile is gradually decreased from the upper part to the lower part of the single pile hole (1).
2. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation as claimed in claim 1, characterized by: and a plurality of branch piles (23) radially distributed along the single pile hole (1) are arranged between the inner ring pile (21) and the outer ring pile (22).
3. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation as claimed in claim 1, characterized by: at least one middle ring pile (24) is arranged between the inner ring pile (21) and the outer ring pile (22), and the ring center of the middle ring pile (24) is concentric with the single pile hole (1).
4. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation as claimed in claim 1, characterized by: the inner ring piles (21), the outer ring piles (22), the branch piles (23) and the middle ring piles (24) are all composed of a plurality of vibroflotation cementing piles.
5. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation as claimed in claim 1, characterized by: the inner ring piles (21), the outer ring piles (22) and the middle ring piles (24) are of circular structures formed by a plurality of vibroflotation cemented piles; the branch piles (23) are linear structures formed by a plurality of vibroflotation cemented piles.
6. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation as claimed in claim 1, characterized by: the heights of the inner ring pile (21), the middle ring pile (24) and the outer ring pile (22) are sequentially reduced to form the vibroflotation cemented pile (2) with a conical structure, and one end with a smaller cross section faces downwards.
7. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation as claimed in claim 5, wherein: the vibroflotation cemented pile (2) comprises a columnar body cemented with gravels (25) and an underwater self-compaction cement-based cementing material (26).
8. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation as claimed in claim 1, characterized by: the upper part of the vibroflotation cemented pile (2) is provided with a cemented riprap body (3), the cemented riprap body (3) is of a cone structure, and the end with a smaller cross section faces upwards.
9. The offshore wind power vibroflotation cemented pile reinforced soft soil foundation single pile foundation of claim 8, wherein: the cemented riprap body (3) is formed by cementing riprap (31) and underwater self-compacting mortar (32).
10. The construction method of the single pile foundation of the offshore wind power vibroflotation cemented pile reinforced soft soil foundation according to any one of claims 1 to 9, characterized by comprising the following steps:
s1, piling, namely, vertically driving a single pile downwards into the seabed along a single pile hole (1) by adopting pile sinking equipment until the design depth is reached, wherein the lower end of the single pile penetrates through the soft soil layer and goes deep into a bearing stratum of the seabed;
s2, forming the inner ring pile into a pile,
s2-1, vibroflotation equipment is adopted to vibroflotation form an initial hole, then a conveying system conveys broken stones (25) to the bottom of a vibroflotation device, vibroflotation and feeding are carried out simultaneously to form a broken stone pile body, meanwhile, an underwater self-compacting cement-based cementing material (26) is conveyed to the bottom of a guide pipe of the vibroflotation device through a conveying pipe, the underwater self-compacting cement-based cementing material (26) flows downwards along a broken stone gap of the broken stone pile body, and the cementing broken stone pile body is formed by vibroflotation, feeding and cementing simultaneously;
the initial hole in the S2-2 and S2-1 is positioned outside the single pile hole (1), and in the process that the vibrator is gradually lifted upwards along the initial hole, the S2-1 is continuously repeated, and an inner ring pile (21) is formed outside the single pile hole (1);
s3, forming a middle ring pile, wherein the initial hole is positioned outside the inner ring pile (21), and S2-1 and S2-2 are repeated along the initial hole in sequence to form the middle ring pile (24) outside the inner ring pile (21);
s4, forming an outer ring pile, wherein the initial hole is positioned outside the middle ring pile (24), and the steps S2-1 and S2-2 are repeated along the initial hole in sequence to form the outer ring pile (22) outside the middle ring pile (24);
s5, forming branch piles, wherein the initial hole is positioned on the inner side of the outer ring pile (22) or the outer side of the inner ring pile (21), and the steps of S2-1 and S2-2 are repeated in sequence to form the branch piles (23);
the inner ring piles, the middle ring piles, the outer ring piles and the soil among the piles are combined to form a vibroflotation cemented pile composite foundation, or the inner ring piles, the outer ring piles, the branch piles and the soil among the piles are combined to form a vibroflotation cemented pile composite foundation; at the moment, the lower end of the vibroflotation cemented pile extends into a seabed bearing stratum, and the upper end of the vibroflotation cemented pile is positioned in a seabed soft soil layer;
s6, filling, namely pressing cement-based grout into a soil body between the inner ring pile (21) and the single pile (1) by using grouting equipment to form solidified soil, and connecting the inner ring pile (21) with the single pile;
s7, throwing the riprap (31) to the upper part of the mud surface of the vibroflotation cemented pile (2) to form a riprap body with a cone structure, and pouring underwater self-compacting concrete or underwater self-compacting cement mortar from the surface of the riprap body to the inside to form a cemented riprap body (3).
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| DE112021001464.1T DE112021001464T5 (en) | 2021-03-08 | 2021-08-31 | Single pile foundation of soft soil foundation reinforced with vibratory cementing piles for offshore wind turbines and construction method therefor |
| 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 |
| GB2216354.7A 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
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| Publication Number | Publication Date |
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| CN112922019A true CN112922019A (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110251975.1A Withdrawn 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 |
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| CN (1) | CN112922019A (en) |
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| CN114277856A (en) * | 2022-01-21 | 2022-04-05 | 中国长江三峡集团有限公司 | Anti-scouring construction method for single-pile foundation based on mosaic underwater cemented rockfill |
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Application publication date: 20210608 |