CN110172992B - Four-barrel fan foundation recycling construction method - Google Patents
Four-barrel fan foundation recycling construction method Download PDFInfo
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- CN110172992B CN110172992B CN201910375779.8A CN201910375779A CN110172992B CN 110172992 B CN110172992 B CN 110172992B CN 201910375779 A CN201910375779 A CN 201910375779A CN 110172992 B CN110172992 B CN 110172992B
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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
- E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations
- E02D35/005—Lowering or lifting of foundation structures
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Abstract
The invention belongs to the technical field of offshore wind power foundation recovery, and discloses a four-cylinder fan foundation recovery construction method, which comprises the steps of firstly enabling the whole fan foundation to incline towards the other single cylinder by means of injecting water and pressurizing to three single cylinders, then releasing the water pressure of the three single cylinders, repeatedly enabling the four single cylinders to incline in sequence, and then simultaneously injecting water and pressurizing to the four single cylinders to enable a cylinder type foundation to ascend; after the rising height of the cylindrical foundation from the initial height reaches a certain requirement, stopping injecting water, and inflating the four single cylinders simultaneously to enable the cylindrical foundation to rise continuously; after the air pumping amount reaches the design requirement, if the cylindrical foundation keeps continuously rising, the cylindrical foundation is lifted to the water surface; and if the cylindrical foundation does not continuously rise any more, the cylindrical foundation rises to the water surface through the upward pulling force of the lifting rope, so that the recovery work of the four-cylinder fan foundation is completed. The invention realizes the integrated recovery of the foundation and the fan, does not need large-scale construction equipment, and has good construction economy and short construction period.
Description
Technical Field
The invention belongs to the technical field of offshore wind power foundation recovery, and particularly relates to a four-cylinder fan foundation recovery construction method.
Background
Offshore wind power has the characteristics of large wind power, stable wind resources, near consumption of power generation energy and the like, and offshore wind power is widely developed in recent years. 2013 and 2017, the newly increased capacity and the accumulated capacity of the offshore wind turbine in China tend to be gradually expanded. In 2017, 319 newly-added installation machines are added, the installation capacity reaches 116 ten thousand kilowatts, the year-by-year increase is 96.5%, and the accumulated installation capacity reaches 279 ten thousand kilowatts. At present, the design service life of offshore wind power is about 20 years, and the wind power foundation is dismantled and upgraded or ecological work is recovered after the service period is finished. The expenses generated by the dismantling construction and dismantling work of the offshore wind farm are more and more paid attention to people, 11 wind turbine generators of the Vindeby offshore wind farm which runs for more than 25 years are dismantled by the Dong Engine in 2017, which is also the decommissioning of the first offshore wind farm in the world, and the foundation, the wind turbine and the offshore transformer substation need to be removed from the sea after the decommissioning of the offshore wind farm, so the dismantling cost is high. Recently, as reported by 2018, the business, energy and industry strategic division of the united kingdom, developers have spent anywhere from 12.8 to 36.4 billion pounds to decommission 37 operating and building offshore wind farms in the united kingdom. The problem of recycling economy of the visible fan structure after the service period is finished needs to be solved urgently. Therefore, a basic recovery mode is needed to be provided, so that the recovery cost of the whole wind turbine is reduced, and the sustainable development of offshore wind power is promoted.
Disclosure of Invention
The invention provides a four-cylinder fan foundation recovery construction method, which aims to solve the technical problem of four-cylinder fan foundation recovery, can smoothly recover offshore wind power foundations and upper structures, realizes marine environment recovery and reduces recovery cost.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a four-barrel fan foundation recovery construction method is carried out aiming at a four-barrel fan foundation, the four-barrel fan foundation comprises a barrel type foundation consisting of a first single barrel, a second single barrel, a third single barrel and a fourth single barrel which are sequentially arranged in a clockwise direction or an anticlockwise direction, and the four-barrel fan foundation recovery construction method comprises the following steps:
(1) respectively injecting water and pressurizing the interiors of the first single cylinder, the second single cylinder and the third single cylinder through a drain pipe until the whole fan foundation inclines towards the direction of the fourth single cylinder;
(2) opening the drain pipes of the first single cylinder, the second single cylinder and the third single cylinder until the internal and external water pressures of the first single cylinder, the second single cylinder and the third single cylinder are equal, and closing the drain pipe of the first single cylinder; injecting water and pressurizing the interiors of the second single cylinder, the third single cylinder and the fourth single cylinder through a drain pipe until the whole fan foundation inclines towards the first single cylinder;
(3) opening the drain pipes of the second single cylinder, the third single cylinder and the fourth single cylinder until the internal and external water pressures of the second single cylinder, the third single cylinder and the fourth single cylinder are equal, and closing the drain pipe of the second single cylinder; then, respectively injecting water and pressurizing the interiors of the third single cylinder, the fourth single cylinder and the first single cylinder through a drain pipe until the whole fan foundation inclines towards the second single cylinder;
(4) opening the drain pipes of the third single cylinder, the fourth single cylinder and the first single cylinder until the internal and external water pressures of the third single cylinder, the fourth single cylinder and the first single cylinder are equal, and closing the drain pipe of the third single cylinder; then, respectively injecting water and pressurizing the interiors of the fourth single cylinder, the first single cylinder and the second single cylinder through a drain pipe until the whole fan foundation inclines towards the third single cylinder;
(5) opening the drain pipes of the fourth single cylinder, the first single cylinder and the second single cylinder until the internal and external water pressures of the fourth single cylinder, the first single cylinder and the second single cylinder are equal, and closing the drain pipes of the fourth single cylinder, the first single cylinder and the second single cylinder;
(6) the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder are all connected with lifting ropes, and the lifting ropes are used for assisting the cylindrical foundation to ascend in the whole process of the step (7) and the step (8);
(7) injecting water into the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder through a drain pipe and pressurizing the water simultaneously to enable the cylindrical foundation to rise;
(8) after the rising height of the cylindrical foundation from the initial height reaches 0.2-0.3 times of the cylinder skirt height, stopping injecting water into the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder, and simultaneously inflating the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder through a drain pipe to enable the cylindrical foundation to continuously rise;
the calculation formula of the total air-inflating quantity V of each single cylinder in the cylinder foundation is as follows:
total air-pumping volume of each single cylinder
Wherein: v is the total air-inflating quantity of each single cylinder in the cylinder foundation and the unit is m3(ii) a M is that the barrel-shaped foundation and the upper structure contain windThe total mass of the machine is kg; rho is the density of the seawater and has the unit of kg/m3；
After each single cylinder in the cylinder foundation is inflated to the total inflation volume V, if the cylinder foundation keeps continuously rising, the cylinder foundation is lifted to the water surface; and if the cylindrical foundation does not continuously rise any more, increasing the upward pulling force of the lifting rope to enable the cylindrical foundation to rise to the water surface.
Therefore, the recovery work of the four-cylinder fan foundation is completed.
Further, the inclination angles in the step (1), the step (2), the step (3) and the step (4) are all 0.5-1 degree.
Further, in the step (6), one end of the lifting rope is connected to a crane on a construction ship, and the other end of the lifting rope is connected to a lifting hole on each single cylinder in the cylinder type foundation.
Furthermore, symmetrically arranged stiffening plates are welded on the upper portion of the top cover of each single cylinder in the cylinder type foundation, and lifting holes are formed in the stiffening plates.
Further, the lifting rope in the step (6) applies tension of 1/20-1/10 to the whole self-weight of the four-barrel fan foundation to each single barrel.
Further, the rising speed of the cylindrical foundation in the step (7) is 1 m/h-2 m/h.
Further, in the ascending process of the barrel type foundation in the step (7), if the whole fan foundation is inclined, the inclination angle of the whole fan foundation is smaller than 0.25 degrees by increasing the water injection amount to the low-level single barrel.
Further, inflating in the step (8) is performed for n times, and inflating is performed once every 15-30 min; every single cylinder in the cylinder foundation beats the tolerance V every time1The calculation formula of (a) is as follows:
wherein: v1The air pumping quantity of each single cylinder in the cylinder foundation is m3(ii) a M is that the barrel-shaped foundation and the upper structure contain windThe total mass of the machine is kg; rho is the density of the seawater and has the unit of kg/m3(ii) a n is the number of inflation times, and the value of n is 10-15.
Further, in the ascending process of the cylinder foundation in the step (8), if the whole fan foundation is inclined, the inclination angle of the whole fan foundation is smaller than 0.25 degree by increasing the air pumping amount of the low-level single cylinder.
The invention has the beneficial effects that:
the invention realizes the integrated recovery of the foundation and the fan, does not need large-scale construction equipment, and has good construction economy and short construction period. The method of inclined water injection jacking is adopted at the initial recovery stage, so that the shearing damage of the soil around the whole barrel-shaped foundation can be realized, and the resistance of the barrel-shaped foundation during water injection jacking is reduced; and then, a water injection and gas injection jacking method is adopted, so that the damage of vibration and noise generated when large-scale construction equipment is used to the surrounding marine environment is avoided, and the method is an environment-friendly construction method.
The invention is not limited to the four-cylinder fan foundation, and is also suitable for recovering other ocean structures adopting the four-cylinder foundation.
Drawings
FIG. 1 is a front view of a four-barrel fan foundation in the recycling method of the present invention;
FIG. 2 is a top view of a four-tube fan foundation in the recycling method of the present invention;
FIG. 3 is a schematic view of sequential jacking of a single cylinder in a four-cylinder fan foundation in the recovery construction method provided by the present invention;
FIG. 4 is a schematic view of a single-cylinder connection lifting rope in the recovery construction method according to the present invention;
FIG. 5 is a schematic diagram of the four-barrel fan foundation being simultaneously water-injected and jacked in the recycling method according to the present invention;
FIG. 6 is a schematic diagram of the leveling and jacking of the four-barrel blower foundation in the recycling construction method according to the present invention;
fig. 7 is a schematic view illustrating the completion of the recovery of the four-barrel blower foundation in the recovery construction method provided by the present invention.
In the above figures: 1-upper jacket and fan structure, 2-drain pipe, 3-cylindrical foundation, 4-seabed, 5-stiffening plate and 6-lifting rope.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the invention discloses a four-barrel fan foundation recycling construction method, which is carried out aiming at a four-barrel fan foundation after the service period is finished, as shown in figures 1 and 2, the four-barrel fan foundation comprises a barrel-shaped foundation 3 formed by four single barrels which are arranged in a square shape, an upper guide pipe frame and a fan structure 1 are connected above the barrel-shaped foundation 3, and a water drain pipe 2 is arranged at the top cover of the barrel-shaped foundation 3. When the four-barrel fan foundation is in place, the barrel type foundation 3 is positioned in the seabed 4.
The four-cylinder fan foundation recovery construction method specifically comprises the following steps:
(1) as shown in fig. 3, the inside of the first single cylinder, the inside of the second single cylinder and the inside of the third single cylinder are respectively injected with water and pressurized through the drain pipe 2 at the top cover of the cylindrical foundation 3 until the whole fan foundation inclines towards the fourth single cylinder, and the inclination angle is generally in the range of 0.5-1 degrees, so that the soil strength in contact with the cylindrical foundation 3 is reduced.
(2) And opening the drain pipes 2 of the first single cylinder, the second single cylinder and the third single cylinder, releasing the internal jacking force of the cylindrical foundation 3 until the internal and external water pressures of the first single cylinder, the second single cylinder and the third single cylinder are equal, and closing the drain pipes 2 of the first single cylinder. And then, respectively injecting water into the second single cylinder, the third single cylinder and the fourth single cylinder through the drain pipe 2 for pressurization until the whole fan foundation inclines towards the first single cylinder, wherein the inclination angle is generally within the range of 0.5-1 degree, and the soil body strength in contact with the cylinder type foundation 3 is continuously reduced.
(3) And opening the drain pipes 2 of the second single cylinder, the third single cylinder and the fourth single cylinder, releasing the jacking force in the cylinder type foundation 3 until the internal and external water pressures of the second single cylinder, the third single cylinder and the fourth single cylinder are equal, and closing the drain pipes 2 of the second single cylinder. And then, respectively injecting water into the first single cylinder, the fourth single cylinder and the third single cylinder through the drain pipe 2 for pressurization until the whole fan foundation inclines towards the second single cylinder, wherein the inclination angle is generally within the range of 0.5-1 degree, and the soil body strength in contact with the cylinder type foundation 3 is continuously reduced.
(4) And opening the drain pipes 2 of the third single cylinder, the fourth single cylinder and the first single cylinder, releasing the jacking force in the cylinder type foundation 3 until the internal and external water pressures of the third single cylinder, the fourth single cylinder and the first single cylinder are equal, and closing the drain pipes 2 of the third single cylinder. And then, respectively injecting water into the fourth single cylinder, the first single cylinder and the second single cylinder through the drain pipe 2 for pressurization until the whole fan foundation inclines towards the third single cylinder, wherein the inclination angle is generally within the range of 0.5-1 degree, and the soil body strength in contact with the cylinder type foundation 3 is continuously reduced.
(5) And opening the drain pipes 2 of the fourth single cylinder, the first single cylinder and the second single cylinder, releasing the jacking force in the cylinder type foundation 3 until the internal and external water pressures of the fourth single cylinder, the first single cylinder and the second single cylinder are equal, and closing the drain pipes 2 of the fourth single cylinder, the first single cylinder and the second single cylinder.
(6) The lifting hole on each single cylinder in the cylinder type foundation 3 is connected with a lifting rope 6, and the lifting rope 6 is connected with a crane on a construction ship. As shown in fig. 4, symmetrically arranged stiffening plates 5 are welded on the upper part of the top cover of each single cylinder in the cylindrical foundation 3, and the stiffening plates 5 are provided with lifting holes to ensure the connection strength of the lifting ropes 6.
(7) As shown in figure 5, water is injected into four single cylinders of the cylindrical foundation 3 through the water discharge pipe 2 at the same time to be pressurized, so that the cylindrical foundation 3 is lifted, the lifting speed is 1-2 m/h, and the phenomenon that the cylindrical foundation 3 overturns due to the over-high speed is avoided.
In the ascending process of the cylinder type foundation 3 in the step (7), if the whole fan foundation is inclined (the inclination angle is larger than 0.25 degrees), the water injection amount of the low-level single cylinder is increased so as to ensure that the inclination angle of the whole fan foundation is smaller than 0.25 degrees.
In the whole process of the step (7), the lifting ropes 6 connected with each single cylinder assist the cylinder type foundation 3 to ascend, generally speaking, the lifting ropes 6 connected with each single cylinder ensure the tension of the whole dead weight of 1/20-1/10 four-cylinder fan foundations, and therefore a crane can adjust the levelness and stability of the whole cylinder type foundation 3.
(8) As shown in fig. 6, after the rising height of the cylindrical foundation 3 from the initial height reaches 0.2 to 0.3 times the height of the cylindrical skirt, the water injection into the four single cylinders of the cylindrical foundation 3 is stopped, and the four single cylinders of the cylindrical foundation 3 are simultaneously inflated through the drain pipes, so that the cylindrical foundation 3 continues to rise.
Inflating is performed n times, and inflating is performed once every 15-30 min. Total air-inflating volume V of each single cylinder in the cylinder type foundation 3 and air-inflating volume V of each single cylinder in the cylinder type foundation 3 each time1The calculation formula of (a) is as follows:
wherein: v is the total air-inflating quantity of each single cylinder in the cylinder foundation 3, and the unit is m3(ii) a M is the total mass of the cylindrical foundation 3, the upper jacket and the fan structure 1 in kg; rho is the density of the seawater and has the unit of kg/m3；V1The air pumping quantity of each single cylinder in the cylinder foundation 3 is m3(ii) a n is the number of inflation times, and the value of n is 10-15.
Inflating each single cylinder in the cylinder foundation 3 to the total inflating volume V: if the cylindrical foundation 3 keeps continuously rising, the cylindrical foundation 3 is lifted to the water surface; if the cylindrical foundation 3 does not rise any more, increasing the upward pulling force of the lifting rope 6 to enable the cylindrical foundation 3 to rise to the water surface; therefore, the recovery work of the four-cylinder fan foundation is completed.
In the ascending process of the cylinder type foundation 3 in the step (8), if the whole fan foundation is inclined (the inclination angle is larger than 0.25 degrees), the air inflating amount of the low single cylinder is increased so as to ensure that the inclination angle of the whole fan foundation is smaller than 0.25 degrees.
In the whole process of the step (8), the lifting ropes 6 connected with each single cylinder assist in lifting the foundation, and generally speaking, the lifting ropes 6 connected with each single cylinder ensure the tension of the whole self weight of the foundation of the four-cylinder fan of 1/20-1/10.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (6)
1. A four-barrel fan foundation recovery construction method is carried out aiming at a four-barrel fan foundation, the four-barrel fan foundation comprises a barrel type foundation consisting of a first single barrel, a second single barrel, a third single barrel and a fourth single barrel which are sequentially arranged in a clockwise direction or an anticlockwise direction, and the four-barrel fan foundation recovery construction method is characterized by comprising the following steps of:
(1) respectively injecting water and pressurizing the interiors of the first single cylinder, the second single cylinder and the third single cylinder through a drain pipe until the whole fan foundation inclines towards the direction of the fourth single cylinder;
(2) opening the drain pipes of the first single cylinder, the second single cylinder and the third single cylinder until the internal and external water pressures of the first single cylinder, the second single cylinder and the third single cylinder are equal, and closing the drain pipe of the first single cylinder; injecting water and pressurizing the interiors of the second single cylinder, the third single cylinder and the fourth single cylinder through a drain pipe until the whole fan foundation inclines towards the first single cylinder;
(3) opening the drain pipes of the second single cylinder, the third single cylinder and the fourth single cylinder until the internal and external water pressures of the second single cylinder, the third single cylinder and the fourth single cylinder are equal, and closing the drain pipe of the second single cylinder; then, respectively injecting water and pressurizing the interiors of the third single cylinder, the fourth single cylinder and the first single cylinder through a drain pipe until the whole fan foundation inclines towards the second single cylinder;
(4) opening the drain pipes of the third single cylinder, the fourth single cylinder and the first single cylinder until the internal and external water pressures of the third single cylinder, the fourth single cylinder and the first single cylinder are equal, and closing the drain pipe of the third single cylinder; then, respectively injecting water and pressurizing the interiors of the fourth single cylinder, the first single cylinder and the second single cylinder through a drain pipe until the whole fan foundation inclines towards the third single cylinder;
the inclination angles in the step (1), the step (2), the step (3) and the step (4) are all 0.5-1 degree;
(5) opening the drain pipes of the fourth single cylinder, the first single cylinder and the second single cylinder until the internal and external water pressures of the fourth single cylinder, the first single cylinder and the second single cylinder are equal, and closing the drain pipes of the fourth single cylinder, the first single cylinder and the second single cylinder;
(6) the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder are all connected with lifting ropes, and the lifting ropes are used for assisting the cylindrical foundation to ascend in the whole process of the step (7) and the step (8);
(7) injecting water into the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder through a drain pipe and pressurizing the water simultaneously to enable the cylinder type foundation to rise;
in the ascending process of the barrel type foundation in the step (7), if the whole fan foundation is inclined, increasing the water injection amount to the low-level single barrel to ensure that the inclination angle of the whole fan foundation is less than 0.25 DEG;
(8) after the rising height of the cylindrical foundation from the initial height reaches 0.2-0.3 times of the cylinder skirt height, stopping injecting water into the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder, and simultaneously inflating the first single cylinder, the second single cylinder, the third single cylinder and the fourth single cylinder through a drain pipe to enable the cylindrical foundation to continuously rise;
total air-pumping volume of each single cylinder in the cylinder foundationVThe calculation formula of (a) is as follows:
total air-pumping volume of each single cylinder
；
Wherein:Vthe total air-inflating volume of each single cylinder in the cylinder foundation is m3；MThe total mass of the cylindrical foundation and the upper structure including the fan is kg;ρis the density of seawater, and has unit of kg/m3；
Inflating each single cylinder in the cylinder foundation for n times, and inflating once every 15-30 min;
each single cylinder in the cylinder foundation is inflated to the total inflation quantityVThen, if the cylindrical foundation keeps continuously rising, the cylindrical foundation is lifted to the water surface; if the cylindrical foundation does not continuously rise, increasing the upward pulling force of the lifting rope to enable the cylindrical foundation to rise to the water surface;
in the ascending process of the cylinder type foundation in the step (8), if the whole fan foundation is inclined, increasing the air pumping quantity of the low-level single cylinder to ensure that the inclination angle of the whole fan foundation is less than 0.25 degrees;
therefore, the recovery work of the four-cylinder fan foundation is completed.
2. The method for recovering and constructing the foundation of the four-barrel wind turbine as claimed in claim 1, wherein the lifting rope in the step (6) is connected to a crane on a construction vessel at one end and is connected to a lifting hole on each single barrel in the barrel type foundation at the other end.
3. The four-barrel fan foundation recovery construction method according to claim 2, wherein symmetrically arranged stiffening plates are welded to the upper portion of the top cover of each single barrel in the barrel type foundation, and lifting holes are formed in the stiffening plates.
4. The method for recycling and constructing a four-tube fan foundation according to claim 1, wherein the lifting rope in the step (6) applies a tension force of 1/20-1/10 to each single tube, wherein the tension force is the whole self weight of the four-tube fan foundation.
5. The recycling construction method of the four-tube fan foundation according to claim 1, wherein the ascending speed of the tube-type foundation in the step (7) is 1m/h to 2 m/h.
6. The recycling method of four-cylinder fan foundation according to claim 1, wherein the air pumping quantity of each single cylinder in the cylinder type foundation in step (8) is one timeV 1 The calculation formula of (a) is as follows:
wherein:V 1 the air pumping quantity of each single cylinder in the cylinder foundation is m3；MThe total mass of the cylindrical foundation and the upper structure including the fan is kg;ρis the density of seawater, and has unit of kg/m3(ii) a n is the number of inflation times, and the value of n is 10-15.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107542101A (en) * | 2017-09-28 | 2018-01-05 | 天津大学 | A kind of four floating drum buoyancy tank combined type foundation structures of sea and its construction method |
| CN109556653A (en) * | 2017-09-27 | 2019-04-02 | 天津大学 | A kind of pipeclay in situ effect test macro and its test method with hydraulic suction cylinder basis |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109556653A (en) * | 2017-09-27 | 2019-04-02 | 天津大学 | A kind of pipeclay in situ effect test macro and its test method with hydraulic suction cylinder basis |
| CN107542101A (en) * | 2017-09-28 | 2018-01-05 | 天津大学 | A kind of four floating drum buoyancy tank combined type foundation structures of sea and its construction method |
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