CN113175004B - Anti-scouring device and method for offshore wind power single-pile foundation - Google Patents

Anti-scouring device and method for offshore wind power single-pile foundation Download PDF

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Publication number
CN113175004B
CN113175004B CN202110449844.4A CN202110449844A CN113175004B CN 113175004 B CN113175004 B CN 113175004B CN 202110449844 A CN202110449844 A CN 202110449844A CN 113175004 B CN113175004 B CN 113175004B
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drainage
jet pump
main pipe
truss
water
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CN113175004A (en
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祝文龙
徐海滨
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China Three Gorges Corp
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China Three Gorges Corp
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/06Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • E02D27/16Foundations formed of separate piles
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/42Foundations for poles, masts or chimneys
    • E02D27/425Foundations for poles, masts or chimneys specially adapted for wind motors masts
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/52Submerged foundations, i.e. submerged in open water
    • E02D27/525Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D13/00Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • F03D13/22Foundations specially adapted for wind motors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D13/00Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • F03D13/25Arrangements for mounting or supporting wind motors; Masts or towers for wind motors specially adapted for offshore installation
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0061Production methods for working underwater
    • E02D2250/0092Production methods for working underwater using hydraulical means
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/727Offshore wind turbines

Abstract

The utility model provides an offshore wind-power single pile basis scour prevention device and method, it includes the jet pump, the drain line, drainage unit and truss, through set up the jet pump in the single pile side, a plurality of drainage units distribute in single pile scour prevention region all around, the truss is connected with drainage unit, drainage line's branch pipe is connected with drainage unit, the person in charge is connected with the jet pump, the fretwork section of drainage unit is located the bed mud face below, the helmet hugs closely the bed mud face and completely cuts off the upper water body, bed soil body pore water gathers into the person in charge and along being responsible for and follow the person in charge and discharge outside the water outlet end from the jet pump intake end, bed soil body pore water discharge volume is greater than the infiltration volume thereby produces the consolidation. The offshore wind power single-pile foundation protection construction method overcomes the problems that the original offshore wind power single-pile foundation protection construction period is long, the foundation is damaged by throwing during construction, and the cost is high, accelerates foundation bed soil layer consolidation, inhibits scouring phenomenon, improves the safety performance of the offshore wind power single-pile foundation, and has the characteristics of simple structure, good stability, low cost, and simplicity and convenience in operation.

Description

Anti-scouring device and method for offshore wind power single-pile foundation
Technical Field
The invention belongs to the technical field of offshore wind power foundations, and relates to an offshore wind power single pile foundation anti-scouring device and method.
Background
With the rapid development and expansion of offshore wind power plants, the steel pipe pile foundation has the characteristics of high single-pile bearing capacity, relatively simple pile sinking process, small soil discharge amount, good bending resistance and the like, and becomes one of the important basic forms of offshore wind power.
Because the original hydrological conditions such as the landform of a seabed, a flow field, a flow velocity and the like are changed by constructing the steel pipe pile foundation, waves, tides and the like are obstructed by the pile columns to generate streaming, the flow velocity of ocean currents around the steel pipe pile is accelerated, the shearing stress of a seabed bed surface in a local range is increased, scouring is generated when the shearing stress exceeds the starting shearing stress of bed sand, the pile foundation is exposed out of the seabed due to the development of a scouring pit, the holding force of the seabed to a fan structure is weakened, and serious challenges are brought to the stability of the foundation and the safe operation of an offshore wind turbine generator. At present, offshore wind power plants are mostly built in oceans with water depths of several meters to dozens of meters, and in engineering monitoring of a plurality of offshore wind power plants, the phenomenon of scouring of different degrees of a viscous seabed and a non-viscous seabed is found, and the local scouring depth can reach several meters or even more than ten meters. In order to ensure the stable structure of the single-pile foundation, the foundation needs to be protected against scour in offshore wind power construction and operation.
The existing protection measures also comprise methods of underwater riprapping within a certain range around the pile to form a reversed filter layer, laying gravity type sand ballast bed surface soil mass to prevent soil mass from being eroded by wave flow, reinforcing the soil mass strength around the foundation by grouting and the like. However, these engineering measures usually require a large amount of material consumption, have long construction period and high cost, and are easy to damage the surface anticorrosive coating of the pile foundation during construction. The observation shows that the problems of secondary scouring still exist after the methods such as stone throwing, gravity type sand quilt and the like are worked, and the protection effect is not as expected.
Disclosure of Invention
The invention aims to solve the technical problem of providing an offshore wind power single-pile foundation anti-scouring device and an offshore wind power single-pile foundation anti-scouring method, the device is simple in structure, a jet pump is arranged on the side surface of a single pile, a plurality of drainage units are distributed in an anti-scouring area around the single pile, a truss is connected with the drainage units, branch pipes of a drainage pipeline are connected with the drainage units, a main pipe is connected with the jet pump, hollow sections of the drainage units are located at the lower part of a bottom bed mud surface, a protective cap is tightly attached to the bottom bed mud surface to isolate an upper water body, pore water is discharged from a water inlet end to the outside of a water outlet end of the jet pump along the main pipe, the pore water discharge amount of a bottom bed soil body is larger than the seepage amount, the bottom bed soil layer consolidation is accelerated, the scouring phenomenon is inhibited, the safety performance of an offshore wind power single-pile foundation is improved, the stability is good, the cost is low, and the operation is simple and convenient.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an offshore wind power single-pile foundation anti-scouring device comprises a jet pump, a drainage pipeline, a drainage unit and a truss; the main pipe of the drainage pipeline is connected with the jet pump, the branch pipes are connected with the main pipe, the branch pipes are respectively connected with the drainage units, the drainage units are distributed around the jet pump by taking the jet pump as the center, and the truss is connected with the drainage units; the branch pipe leads water in the drainage unit into the main pipe and then the water is discharged by the jet pump.
The drainage pipeline comprises a plurality of branch pipes connected with a main pipe, and when the distribution form of the drainage units changes, the main pipe extends to be close to the drainage units.
The drainage unit comprises a protective cap connected with the hollow cylinder, the water outlet is positioned on one side of the upper part of the protective cap and communicated with the hollow cylinder, and the hollow cylinder positioned on the lower part of the protective cap is a hollow section.
The hollow section of the hollow cylinder body is wrapped with geotextile and is positioned outside the geotextile and wrapped with a steel wire mesh.
The protective cap is of a conical structure, and the conical bottom with the larger cross section faces downwards.
The trusses are rectangular frame structures, the trusses are located at each end of a main pipe of the H-shaped structure, and the drainage units are located at the lower portions of the trusses and vertically connected with the trusses.
The trusses are of a triangular frame structure, the trusses are distributed on the sides of a main pipe of the rectangular structure, and the drainage units are located on the lower portions of the trusses and vertically connected with the top points of the trusses.
The truss is of a circular frame structure, a plurality of uniformly distributed drainage units are vertically connected with the truss and located on the lower side, and a main pipe of the circular frame structure is located on the inner side or the outer side of the truss.
A plurality of drainage units are arranged on the outer side of the truss in a circular ring shape.
The anti-scouring method of the anti-scouring device for the offshore wind power single-pile foundation comprises the following steps:
s1, installing a jet pump, installing the jet pump in the single pile, leading a water discharging end of the jet pump out of the single pile, and communicating a water inlet end with the main pipe;
s2, installing drainage units, placing hollow cylinders of the drainage units into a single-pile anti-scouring area, and tightly attaching protective caps to the mud surface of the bottom bed to isolate the water body above; in the process, the steel wire mesh protects the geotextile from being scratched by sharp gravels;
s3, mounting a truss, and connecting and fixing the lower side surface of the truss and the upper ends of the hollow columns of the plurality of drainage units;
s4, installing a main pipe, and arranging the main pipe between the upper part of the mud surface and the lower part of the truss according to the structural distribution form of the drainage units;
s5, mounting branch pipes, and respectively connecting each branch pipe connected with the main pipe with a water outlet of the drainage unit;
s6, converging, starting the jet pump, and making pore water in the bottom bed soil body radially seep into the hollow column along the drainage unit, overflow from the water outlet and then enter the main pipe along the branch pipe; in the process, the geotextile prevents soil particles from entering the hollow column;
s7, draining, wherein pore water is drained from the water inlet end of the jet pump to the outside of the water outlet end along the main pipe;
s8, scouring prevention, wherein in S7, under the low permeability characteristic of the cohesive soil of the bottom bed and the isolation protection of the protective cap, the water discharge amount of the soil body in the bottom bed pores is larger than the seepage amount, the water pressure of the soil body in the bottom bed pores is gradually reduced, the soil body strength and the effective stress are increased, the soil layer in the bottom bed is accelerated to be consolidated, the silt of the bed surface is difficult to start, and the scouring phenomenon is inhibited.
An offshore wind power single-pile foundation anti-scouring device comprises a jet pump, a drainage pipeline, a drainage unit and a truss; the main pipe of the drainage pipeline is connected with the jet pump, the branch pipes are connected with the main pipe, the branch pipes are respectively connected with the drainage units, the drainage units are distributed around the jet pump by taking the jet pump as the center, and the truss is connected with the drainage units; the branch pipe leads water in the drainage unit into the main pipe and then the water is discharged by the jet pump. Simple structure, through set up the jet pump in the single pile side, a plurality of drainage unit distribute in single pile scour prevention region all around, the truss is connected with drainage unit, drainage pipe's branch pipe and drainage unit are connected, be responsible for and be connected with the jet pump, drainage unit's fretwork section is located end bed mud face lower part, the isolated top water of end bed mud face is hugged closely to the helmet, the hole water is responsible for and is discharged to the play water end outside along being responsible for from the jet pump end of intaking through drainage unit and branch pipe convergence, end bed soil body hole water discharge capacity is greater than the infiltration volume, bottom bed soil layer concreties with higher speed, the emergence of the phenomenon of restraining to erode, improve the security performance on marine wind-powered electricity generation single pile basis, good stability, low cost, easy operation is convenient.
In a preferred embodiment, the drain line includes a plurality of branch pipes connected to the main pipe, and the main pipe extends close to the drain units when the distribution pattern of the drain units is changed. Simple structure, when in use, pore water overflowing from the drainage unit enters the main pipe along the branch pipe and is discharged by the jet pump.
In a preferred scheme, the drainage unit comprises a protective cap connected with a hollow cylinder, the water outlet is positioned on one side of the upper part of the protective cap and communicated with the hollow cylinder, and the hollow cylinder positioned on the lower part of the protective cap is a hollow section. Simple structure, during the use, the end bed earth is arranged in to the cavity cylinder, and the helmet hugs closely earth, makes helmet top water isolated with the mud face, and inside the hollow section infiltration cavity cylinder of pore water follow cavity cylinder in the earth.
In a preferred scheme, the hollowed-out section of the hollow cylinder body is wrapped with geotextile, and a steel wire mesh is wrapped outside the geotextile. The structure is simple, when in use, the geotextile coated on the hollow section of the hollow cylinder effectively blocks the silt particles from entering the hollow cylinder, reduces deposition and avoids blocking pipelines; be located the outer steel wire net of cladding of geotechnological cloth and avoid the drainage unit to arrange the in-process of earth in and be scratched by sharp-pointed grit and cause geotechnological cloth inefficacy.
In a preferred scheme, the protective cap is of a conical structure, and a conical bottom with a larger section faces downwards. Simple structure, the great one end in cross-section of the helmet that is located the toper structure is hugged closely with earth surface, has enlarged the scope of protection earth, effectively isolated upper portion water gets into the helmet lower part.
In a preferable scheme, the truss is a rectangular frame structure, a plurality of trusses are positioned at each end of a main pipe of the H-shaped structure, and a plurality of drainage units are positioned at the lower parts of the trusses and vertically connected with the truss. Simple structure, during the use, rectangular frame structure's truss is the array and lays around the single pile, is the main pipe of H type structure each end and extends to each truss lower part, puts into the drainage unit in earth and is connected with the truss, improves holistic structural strength.
In a preferred scheme, the trusses are triangular frame structures, a plurality of trusses are distributed on each side of a main pipe of the rectangular structure, and a plurality of drainage units are located at the lower parts of the trusses and vertically connected with the vertexes of the trusses. Simple structure, when laying, one of them apex angle of truss is towards the single pile center, and the truss is connected with the drainage cell around the single pile respectively, and stability is good.
In a preferred scheme, the truss is of a circular frame structure, a plurality of uniformly distributed drainage units are vertically connected with the truss on the lower side, and a main pipe of the circular frame structure is located on the inner side or the outer side of the truss. The drainage unit that simple structure during the use is located around the single pile is the ring shape and lays, and the truss and the drainage unit of ring frame structure are connected, and the person in charge and the drainage unit of ring frame structure, at the drainage in-process, the distance of drainage unit to jet pump keeps unanimous, is favorable to the pore water in the balanced drainage unit of each, makes the bed soil layer concretion tend to the equilibrium.
In a preferred scheme, a plurality of drainage units are arranged outside the truss in a circular ring shape. Simple structure, during the use, lay a plurality of drainage unit outside the truss, be favorable to further expanding earth pore water infiltration volume, further accelerate the bed soil layer consolidation speed.
In a preferred embodiment, the method for preventing the erosion of the offshore wind power monopile foundation erosion protection device comprises the following steps:
s1, installing a jet pump, installing the jet pump in the single pile, leading a water discharging end of the jet pump out of the single pile, and communicating a water inlet end with the main pipe;
s2, installing drainage units, placing hollow cylinders of the drainage units into a single-pile anti-scouring area, and tightly attaching protective caps to the mud surface of the bottom bed to isolate the water body above; in the process, the steel wire mesh protects the geotextile from being scratched by sharp gravels;
s3, mounting a truss, and connecting and fixing the lower side surface of the truss and the upper ends of the hollow columns of the plurality of drainage units;
s4, installing a main pipe, and arranging the main pipe between the upper part of the mud surface and the lower part of the truss according to the structural distribution form of the drainage units;
s5, mounting branch pipes, and respectively connecting each branch pipe connected with the main pipe with a water outlet of the drainage unit;
s6, converging, starting the jet pump, and making pore water in the bottom bed soil body radially seep into the hollow column along the drainage unit, overflow from the water outlet and then enter the main pipe along the branch pipe; in the process, the geotextile prevents soil particles from entering the hollow column;
s7, draining, wherein pore water is drained from the water inlet end of the jet pump to the outside of the water outlet end along the main pipe;
s8, scouring prevention, wherein in S7, under the low permeability characteristic of the cohesive soil of the bottom bed and the isolation protection of the protective cap, the water discharge amount of the soil body in the bottom bed pores is larger than the seepage amount, the water pressure of the soil body in the bottom bed pores is gradually reduced, the soil body strength and the effective stress are increased, the soil layer in the bottom bed is accelerated to be consolidated, the silt of the bed surface is difficult to start, and the scouring phenomenon is inhibited. The method is simple and convenient to operate, is beneficial to improving the safety performance of the offshore wind power single pile foundation, is low in manufacturing cost, can stably work in the offshore environment for a long time, and has an anti-scouring protection effect on the single pile.
The utility model provides an offshore wind-power single pile basis scour prevention device and method, it includes the jet pump, the drain line, drainage unit and truss, through set up the jet pump in single pile side, a plurality of drainage units distribute in single pile scour prevention region all around, the truss is connected with drainage unit, drainage line's branch pipe is connected with drainage unit, the person in charge is connected with the jet pump, the fretwork section of drainage unit is located bottom bed mud face lower part, the isolated top water body of bottom bed mud face is hugged closely to the helmet, discharge to outside the water outlet end from the jet pump intake end along being responsible for through the hole water, bottom bed soil body hole discharge of water is greater than the infiltration volume thereby produces the consolidation. The offshore wind power single-pile foundation protection construction method overcomes the problems that the original offshore wind power single-pile foundation protection construction period is long, the foundation is damaged by throwing during construction, and the cost is high, accelerates consolidation of a foundation bed soil layer, inhibits scouring, improves the safety performance of the offshore wind power single-pile foundation, and has the characteristics of simple structure, good stability, low cost, and simplicity and convenience in operation.
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 another schematic structural diagram of the present invention.
Fig. 3 is another schematic structural diagram of the present invention.
Fig. 4 is a use state diagram of the present invention.
In the figure: the water-saving drainage device comprises a jet pump 1, a drainage pipeline 2, a main pipe 21, branch pipes 22, a drainage unit 3, a hollow column 31, a protective cap 32, a water outlet 33, a steel wire mesh 34 and a truss 4.
Detailed Description
As shown in fig. 1 to 4, an offshore wind power single-pile foundation anti-scouring device comprises a jet pump 1, a drainage pipeline 2, a drainage unit 3 and a truss 4; the main pipe 21 of the drainage pipeline 2 is connected with the jet pump 1, the branch pipes 22 are connected with the main pipe 21, the branch pipes 22 are respectively connected with the drainage units 3, the drainage units 3 are distributed around the jet pump 1 by taking the jet pump 1 as a center, and the truss 4 is connected with the drainage units 3; the branch pipe 22 introduces water in the drain unit 3 into the main pipe 21 and then discharges the water by the jet pump 1. Simple structure, through set up jet pump 1 in the single pile, a plurality of drainage unit 3 distribute in single pile scour prevention region all around, truss 4 is connected with drainage unit 3, the branch pipe 22 and the drainage unit 3 of drainage pipeline 2 are connected, it is connected with jet pump 1 to be responsible for 21, drainage unit 3's fretwork section is located end bed mud face lower part, the isolated top water of end bed mud face is hugged closely to helmet 32, discharge to the water outlet end outside along being responsible for 21 from jet pump 1 end of intaking through the hole water, end bed soil body hole discharge capacity is greater than the infiltration volume, bottom bed soil layer concreties with higher speed, the emergence of the phenomenon of washing away is restrained, the security performance on marine wind-powered electricity generation single pile basis is improved, good stability, low cost, and easy operation is convenient.
Preferably, the power of the jet pump 1 is provided by a wind turbine generator, and the power transmission distance is shortened.
In a preferred embodiment, the drain pipeline 2 includes a plurality of branch pipes 22 connected to the main pipe 21, and when the distribution pattern of the drain units 3 is changed, the main pipe 21 extends close to the drain units 3. Simple structure, when in use, pore water overflowing from the drainage unit 3 enters the main pipe 21 along the branch pipe 22 and is discharged by the jet pump 1.
Preferably, during installation, the main pipe 21 is directly placed on the upper portion of the soil, installation is convenient and fast, and cost is saved.
Preferably, the main pipe 21 extends close to the drain unit 3, which facilitates shortening the distance between the branch pipe 22 and the drain unit 3.
In a preferred scheme, the drainage unit 3 comprises a protective cap 32 connected with a hollow cylinder 31, a water outlet 33 is positioned on one side of the upper part of the protective cap 32 and communicated with the hollow cylinder 31, and the hollow cylinder 31 positioned on the lower part of the protective cap 32 is a hollow section. Simple structure, during the use, the end bed earth is arranged in to cavity cylinder 31, and the helmet 32 hugs closely earth, makes the helmet 32 top water isolated with the mud face, and the hole water in the earth is inside from the fretwork section infiltration cavity cylinder 31 of cavity cylinder 31.
In a preferred scheme, the hollowed-out section of the hollow cylinder 31 is wrapped with geotextile, and is located outside the geotextile and wrapped with a steel wire mesh 34. The structure is simple, when in use, the geotextile coated on the hollow section of the hollow cylinder 31 effectively blocks the silt particles from entering the hollow cylinder 31, thereby reducing deposition and avoiding blocking pipelines; the steel wire mesh 34 is wrapped outside the geotextile to prevent the geotextile from losing efficacy due to the fact that the drainage unit 3 is scratched by sharp gravels in the process of placing the geotextile in soil.
In a preferred embodiment, the protective cap 32 has a tapered structure, and a tapered bottom with a larger cross section faces downward. Simple structure, the great one end in cross-section of the helmet 32 that is located the toper structure is hugged closely with earth surface, has enlarged the scope of protection earth, effectively isolated upper portion water gets into the helmet 32 lower part.
In a preferred embodiment, the trusses 4 are rectangular frame structures, a plurality of trusses 4 are located at each end of the main pipe 21 of the H-shaped structure, and a plurality of drainage units 3 are located at the lower portions of the trusses 4 and vertically connected thereto. Simple structure, during the use, truss 4 of rectangular frame structure is the array and lays around the single pile, is the main pipe 21 each end of H type structure and extends to each truss 4 lower part, and the drainage unit 3 of putting into earth is connected with truss 4, improves holistic structural strength.
In a preferred embodiment, the trusses 4 are triangular frame structures, a plurality of trusses 4 are distributed on each side of the main pipe 21 of the rectangular structure, and a plurality of drainage units 3 are located at the lower parts of the trusses 4 and vertically connected with the vertexes thereof. Simple structure, when laying, one of them apex angle of truss 4 is towards the single pile center, and truss 4 is connected with the drainage cell 3 respectively around the single pile, and stability is good.
In a preferred scheme, the truss 4 is a circular frame structure, a plurality of uniformly distributed drainage units 3 are vertically connected with the circular frame structure at the lower side, and a main pipe 21 of the circular frame structure is positioned at the inner side or the outer side of the truss 4. Simple structure, during the use, the drainage unit 3 that is located around the single pile is the ring shape and is laid, and the truss 4 and the drainage unit 3 of ring shape frame construction are connected, and the person in charge 21 and the drainage unit 3 of ring shape structure, at the drainage in-process, the distance of drainage unit 3 to jet pump 1 keeps unanimous, is favorable to the pore water in each drainage unit 3 of balanced discharge, makes the consolidation of foundation bed soil layer tend to the equilibrium.
In a preferred embodiment, a plurality of drainage units 3 are arranged outside the truss 4 in a circular ring shape. Simple structure, during the use, lay a plurality of drainage unit 3 outside truss 4, be favorable to further expanding earth pore water infiltration volume, further accelerate the bed soil layer consolidation speed.
In a preferred embodiment, the anti-scour method for the anti-scour device for the offshore wind power single-pile foundation comprises the following steps:
s1, installing the jet pump 1 in the single pile, leading the water discharging end of the jet pump 1 out of the single pile, and communicating the water inlet end with the main pipe 21;
s2, installing drainage units, placing the hollow columns 31 of the drainage units 3 into a single-pile anti-scouring area, and tightly attaching the protective caps 32 to the mud surface of the bottom bed to isolate the water body above; in the process, the steel wire mesh 34 protects the geotextile from being scratched by sharp gravels;
s3, installing a truss, and connecting and fixing the lower side surface of the truss 4 and the upper ends of the hollow columns 31 of the plurality of drainage units 3;
s4, installing a main pipe, and arranging the main pipe 21 between the upper part of the mud surface and the lower part of the truss 4 according to the structural distribution form of the drainage units 3;
s5, installing branch pipes, and connecting the branch pipes 22 connected with the main pipe 21 with the water outlets 33 of the drainage units 3;
s6, converging, starting the jet pump 1, and making pore water in the bottom bed soil body radially seep into the hollow column 31 along the drainage unit 3, overflow from the water outlet 33 and then enter the main pipe 21 along the branch pipe 22; in the process, the geotextile prevents soil particles from entering the hollow column 31;
s7, draining, wherein pore water is drained from the water inlet end of the jet pump 1 to the outside of the water outlet end along the main pipe 21;
s8, scouring prevention, wherein in S7, under the low permeability characteristic of the cohesive soil of the bottom bed and the isolation protection of the protective cap 32, the water discharge amount of the soil body in the bottom bed pores is larger than the seepage amount, the water pressure of the soil body in the bottom bed pores is gradually reduced, the soil body strength and the effective stress are increased, the soil layer in the bottom bed is accelerated to be consolidated, the silt on the bed surface is difficult to start, and the scouring phenomenon is inhibited. The method is simple and convenient to operate, is beneficial to improving the safety performance of the offshore wind power single pile foundation, is low in manufacturing cost, can stably work in the offshore environment for a long time, and has an anti-scouring protection effect on the single pile.
When the offshore wind power single-pile foundation anti-scouring device and the offshore wind power single-pile foundation anti-scouring method are installed and used, the jet pump 1 is arranged on the side face of the single pile, the plurality of water drainage units 3 are distributed in an anti-scouring area around the single pile, the truss 4 is connected with the water drainage units 3, the branch pipes 22 of the water drainage pipeline 2 are connected with the water drainage units 3, the main pipe 21 is connected with the jet pump 1, the hollow sections of the water drainage units 3 are located on the lower portion of the bottom bed mud surface, the protective caps 32 are tightly attached to the bottom bed mud surface to isolate a water body above the bottom bed mud surface, pore water is discharged from the water inlet end of the jet pump 1 to the outside of the water outlet end along the main pipe 21, the pore water discharge amount of the bottom bed soil body is larger than the penetration amount, consolidation of the bottom bed soil layer is accelerated, scouring phenomenon is inhibited, the safety performance of the offshore wind power single-pile foundation is improved, the stability is good, the cost is low, and the operation is simple and convenient.
When in use, pore water overflowing from the drainage unit 3 enters the main pipe 21 along the branch pipe 22 and is discharged by the jet pump 1.
During the use, cavity cylinder 31 is arranged in end bed earth, and the helmet 32 hugs closely earth, makes the water and the mud face isolated above the helmet 32, and the inside hollow section infiltration of the hollow section of cavity cylinder 31 of pore water in the earth.
When in use, the geotextile covering the hollow section of the hollow cylinder 31 effectively blocks the silt particles from entering the hollow cylinder 31, reduces deposition and avoids blocking pipelines; the steel wire mesh 34 is wrapped outside the geotextile to prevent the geotextile from losing efficacy due to the fact that the drainage unit 3 is scratched by sharp gravels in the process of placing the geotextile in soil.
The larger end of the section of the protective cap 32 with the conical structure is tightly attached to the surface of soil, so that the range of protecting the soil is expanded, and the upper water body is effectively isolated from entering the lower part of the protective cap 32.
When the drainage system is used, the trusses 4 of the rectangular frame structure are arranged around the single pile in an array mode, each end of the main pipe 21 of the H-shaped structure extends to the lower portion of each truss 4, the drainage unit 3 placed in soil is connected with the trusses 4, and the overall structural strength is improved.
When the drainage system is arranged, one vertex angle of the truss 4 faces to the center of the single pile, and the truss 4 is connected with the drainage units 3 around the single pile respectively, so that the stability is good.
When the drainage device is used, the drainage units 3 positioned around the single pile are distributed in a circular ring shape, the truss 4 of the circular ring frame structure is connected with the drainage units 3, and the main pipe 21 of the circular ring structure and the drainage units 3 keep consistent distance from the drainage units 3 to the jet pump 1 in the drainage process, so that pore water in each drainage unit 3 can be drained uniformly, and the soil layer consolidation of the bottom bed tends to be uniform.
When the water drainage device is used, the plurality of water drainage units 3 arranged outside the truss 4 are beneficial to further enlarging the soil pore water infiltration amount and further accelerating the consolidation speed of the soil layer of the bottom bed.
The above-described embodiments are merely preferred technical solutions of the present invention, and should not be construed as limiting the present invention, and the embodiments and features in the embodiments 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 (7)

1. The utility model provides an offshore wind-power single pile basis anti-scour device which characterized by: the device comprises a jet pump (1), a drainage pipeline (2), a drainage unit (3) and a truss (4); a main pipe (21) of the drainage pipeline (2) is connected with the jet pump (1), branch pipes (22) are connected with the main pipe (21), the branch pipes (22) are respectively connected with the drainage units (3), the drainage units (3) are distributed around the jet pump (1) by taking the jet pump (1) as a center, and the truss (4) is connected with the drainage units (3); the branch pipe (22) leads water in the drainage unit (3) into the main pipe (21) and then the water is discharged by the jet pump (1);
the drainage unit (3) comprises a protective cap (32) connected with the hollow column body (31), a water outlet (33) is positioned on one side of the upper part of the protective cap (32) and communicated with the hollow column body (31), and the hollow column body (31) positioned on the lower part of the protective cap (32) is a hollow section;
the hollow section of the hollow cylinder (31) is wrapped with geotextile, and is positioned outside the geotextile and wrapped with a steel wire mesh (34);
the protective cap (32) is of a conical structure, and the conical bottom with a larger section faces downwards.
2. An offshore wind power single pile foundation anti-scour arrangement as claimed in claim 1, wherein: the drainage pipeline (2) comprises a plurality of branch pipes (22) connected with a main pipe (21), and when the distribution form of the drainage units (3) changes, the main pipe (21) extends to be close to the drainage units (3).
3. An offshore wind power single pile foundation anti-scour arrangement as claimed in claim 1, wherein: the trusses (4) are of rectangular frame structures, the trusses (4) are located at each end of a main pipe (21) of the H-shaped structure, and the drainage units (3) are located at the lower portions of the trusses (4) and are vertically connected with the trusses.
4. An offshore wind power single-pile foundation anti-scour device according to claim 1, wherein: the trusses (4) are of a triangular frame structure, the trusses (4) are distributed on each side of a main pipe (21) of the rectangular structure, and the drainage units (3) are located on the lower portions of the trusses (4) and are vertically connected with the top points of the trusses.
5. An offshore wind power single pile foundation anti-scour arrangement as claimed in claim 1, wherein: the truss (4) is of a circular frame structure, a plurality of uniformly distributed drainage units (3) are vertically connected with the truss (4) and located on the lower side of the truss, and a main pipe (21) of the circular frame structure is located on the inner side or the outer side of the truss (4).
6. An offshore wind power single pile foundation anti-scour apparatus as claimed in claim 5, wherein: and a plurality of drainage units (3) are arranged on the outer side of the truss (4) in a circular ring shape.
7. An anti-scouring method for an anti-scouring device for an offshore wind power single pile foundation according to any one of claims 1 to 6, characterized by comprising the steps of:
s1, installing a jet pump, installing the jet pump (1) on the side surface of the single pile, leading the water discharging end of the jet pump (1) out of the single pile, and communicating the water inlet end with the main pipe (21);
s2, installing drainage units, placing the hollow columns (31) of the drainage units (3) into a single-pile anti-scouring area, and enabling the protective caps (32) to cling to the mud surface of the bottom bed to isolate the water body above; in the process, the steel wire mesh (34) protects the geotextile from being scratched by sharp gravel;
s3, mounting a truss, and connecting and fixing the lower side surface of the truss (4) and the upper ends of the hollow columns (31) of the plurality of drainage units (3);
s4, installing a main pipe, and arranging the main pipe (21) between the upper part of the mud surface and the lower part of the truss (4) according to the structural distribution form of the drainage units (3);
s5, mounting branch pipes, and respectively connecting each branch pipe (22) connected with the main pipe (21) with a water outlet (33) of the drainage unit (3);
s6, converging, starting the jet pump (1), and enabling pore water in a bottom bed soil body to radially seep into the hollow column (31) along the drainage unit (3), overflow from the water outlet (33) and then flow into the main pipe (21) along the branch pipe (22); in the process, the geotextile prevents soil particles from entering the hollow column (31);
s7, draining, wherein pore water is drained from the water inlet end of the jet pump (1) to the outside of the water outlet end along the main pipe (21);
s8, scouring prevention, wherein in S7, under the low permeability characteristic of the cohesive soil of the bottom bed and the isolation protection of the protective cap (32), the water discharge amount of the soil body pore water of the bottom bed is larger than the seepage amount, the water pressure of the soil body pore water of the bottom bed is gradually reduced, the soil body strength and the effective stress are increased, the soil layer of the bottom bed is accelerated to be consolidated, the start of the sediment on the bed surface is difficult, and the scouring phenomenon is inhibited.
CN202110449844.4A 2021-04-25 2021-04-25 Anti-scouring device and method for offshore wind power single-pile foundation Active CN113175004B (en)

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CN114606985B (en) * 2022-02-22 2023-03-31 中天科技集团海洋工程有限公司 Anti-scouring device for offshore wind power single-pile foundation

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CN103031834A (en) * 2011-10-09 2013-04-10 徐云童 Low-position vacuum preloading rapid reinforcement method of soft foundation in hydraulic filling and reclamation
WO2014032658A2 (en) * 2012-09-03 2014-03-06 Jacobus Van Der Meer Offshore foundation, and production method
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CN109881659A (en) * 2019-03-27 2019-06-14 东南大学 A kind of offshore wind farm steel pipe pile foundation foundation reinforcement method with protection against erosion ability
CN110984214A (en) * 2019-12-19 2020-04-10 中国长江三峡集团有限公司 Offshore wind power single pile-wing plate-rockfill composite foundation and construction method thereof
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FR2627202A1 (en) * 1988-02-15 1989-08-18 Menard Soltraitement METHOD AND DEVICE FOR CONSOLIDATION OF LANDS
CN103031834A (en) * 2011-10-09 2013-04-10 徐云童 Low-position vacuum preloading rapid reinforcement method of soft foundation in hydraulic filling and reclamation
WO2014032658A2 (en) * 2012-09-03 2014-03-06 Jacobus Van Der Meer Offshore foundation, and production method
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