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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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 238000004064 recycling Methods 0.000 title description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000011084 recovery Methods 0.000 claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 15
- 230000000630 rising effect Effects 0.000 claims description 7
- 239000013535 sea water Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 description 5
- 230000001174 ascending effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
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- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
本发明属于海上风电基础回收技术领域，公开了一种四筒风机基础回收施工方法，先通过向三个单筒注水加压的方式，使整个风机基础向另外一个单筒方向发生倾斜，之后释放三个单筒的水压力，如此重复使四个单筒依次发生倾斜后，向四个单筒同时内注水打压，使筒型基础上升；筒型基础自初始高度的上升高度达到一定要求后，停止注水，改为向四个单筒同时打气，使筒型基础继续上升；打气量达到设计要求后，若筒型基础保持继续上升，则待筒型基础上升至水面；若筒型基础不再继续上升，则通过吊绳的上拔力使筒型基础上升至水面，由此完成四筒风机基础的回收工作。本发明实现了基础与风机一体化回收，不需要大型施工设备，同时施工经济性好，施工工期短。
The invention belongs to the technical field of offshore wind power foundation recovery, and discloses a four-tube fan foundation recovery construction method. First, by injecting water and pressurizing three single tubes, the entire fan foundation is inclined in the direction of another single tube, and then released. The water pressure of the three single cylinders is repeated so that the four single cylinders are inclined in sequence, and water is injected into the four single cylinders at the same time to make the cylinder foundation rise; after the rise of the cylinder foundation from the initial height reaches a certain requirement, Stop the water injection and pump air into the four single cylinders at the same time, so that the cylinder foundation continues to rise; after the pumping amount reaches the design requirements, if the cylinder foundation continues to rise, wait for the cylinder foundation to rise to the water surface; if the cylinder foundation is no longer If it continues to rise, the cylinder foundation will rise to the water surface through the upward pulling force of the suspending rope, thus completing the recovery of the four-cylinder fan foundation. The invention realizes the integrated recovery of the foundation and the fan, does not require 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)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910375779.8A CN110172992B (en) | 2019-05-07 | 2019-05-07 | Four-barrel fan foundation recycling construction method |
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| CN201910375779.8A CN110172992B (en) | 2019-05-07 | 2019-05-07 | Four-barrel fan foundation recycling construction method |
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| CN110172992A CN110172992A (en) | 2019-08-27 |
| CN110172992B true CN110172992B (en) | 2021-06-04 |
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| CN201910375779.8A Expired - Fee Related CN110172992B (en) | 2019-05-07 | 2019-05-07 | Four-barrel fan foundation recycling construction method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Patent Citations (2)
| 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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