Offshore wind turbine cylinder foundation air pressure leveling and correction system and correction method

Abstract

The present invention discloses an offshore wind power cylindrical foundation pneumatic leveling and correction system and correction method thereof, comprising a cylindrical skirt, a single column and a diagonal brace, a plurality of fan-shaped wing plates are distributed on a circle on the outer side of the steel cylindrical skirt, and the fan-shaped wing plates are flush with the top of the cylindrical skirt; an inflatable airbag is arranged under the fan-shaped wing plate, and when the cylindrical foundation tilts, the airbag will be inflated to correct the cylindrical foundation; a reaction beam is arranged on the fan-shaped wing plate, and the reaction beam is connected to the single column. The present invention proposes an offshore wind power cylindrical foundation pneumatic leveling grouting reinforcement and correction system, which has the functions of preventing tilting and adjusting after tilting for the cylindrical foundation, enhances the adaptability and safety of the cylindrical foundation in soft geology, expands the application range of the cylindrical foundation, and enables the cylindrical foundation to be installed in geology that originally did not meet the requirements of the cylindrical foundation, further reducing the construction cost of the offshore wind power foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to an offshore wind power cylinder foundation air pressure leveling and deviation correction system and a deviation correction method thereof. Background Art

[0002] The barrel foundation is a large-area top bearing structure and a new offshore wind power foundation type. It makes full use of the interaction between barrel and soil, making the bearing capacity of the barrel top soil and the resistance of the soil around the barrel the main factors for the stability of the barrel. In recent years, various types of barrel foundations have been used to a certain extent. Its advantages such as good economy, no need for piling, and convenient construction make it have the innate conditions for large-scale promotion.

[0003] As for the barrel foundations that have been installed and operated, some positions have experienced plastic cumulative deformation of the soil on one side under the long-term single-direction load of the upper wind turbine due to uneven soil and strata. This deformation is irreversible, resulting in the loss of soil resistance on one side of the barrel skirt, and the inclination of the foundation is inevitable. In addition, due to the complex ocean currents, the scouring of the barrel foundation has caused a cavity on one side of the barrel, which will also cause obvious inclination of the barrel. After the inclination of the barrel, the upper center of gravity will shift, thereby aggravating the inclination of the barrel foundation.

[0004] Patent CN201410181040.0 "A real-time monitoring method for the sinking posture of a composite cylindrical foundation for offshore wind turbines" adopts a method of real-time monitoring of the inclination angle and vacuum negative pressure leveling during the sinking process of the cylindrical foundation. This method can achieve the sinking and placement of the foundation more accurately, but after the sinking is completed, there may be unequal air pressures in each compartment. As the running time increases, the pressure difference inside and outside the cylinder gradually dissipates, causing the forces in each compartment to be unbalanced, causing the foundation to tilt. Once the foundation is tilted, it is difficult to achieve the correction effect by relying on negative pressure and water filling: when the negative pressure and water pressure are large, the foundation will bend, and when the negative pressure is small, it cannot provide the force required to straighten the foundation. Therefore, the negative pressure and water filling leveling method has obvious limitations.

[0005] Therefore, it is urgent to provide a new solution to solve the problem that the barrel foundation is prone to tilting, and to take effective measures to correct the deviation of the barrel foundation. Summary of the invention

[0006] The purpose of the present invention is to address the problem that the cylinder foundation is prone to tilt and it is difficult to take effective measures to correct the tilt. An offshore wind power cylinder foundation air pressure leveling and correction system and a correction method are proposed, which can enhance the anti-overturning ability of the traditional cylinder foundation. When the cylinder foundation is at risk of tilting, self-feedback correction can be performed to prevent further overturning, which has positive significance for the improvement and large-scale promotion of cylinder foundation technology.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] The offshore wind power cylindrical foundation pneumatic leveling and deviation correction system comprises a cylindrical skirt, a single column and a diagonal brace. A plurality of fan-shaped wing panels are distributed on the outer circle of the cylindrical skirt. An inflatable airbag is arranged under the fan-shaped wing panel. When the cylindrical foundation is tilted, the airbag will be inflated to correct the deviation of the cylindrical foundation. A reaction beam is arranged on the fan-shaped wing panel, and the reaction beam is connected to the single column.

[0009] Preferably, a support frame is provided on the fan-shaped wing plate; one end of the reaction beam is installed on the support frame, and the other end is connected to the single column through a collar; the collar is movably sleeved on the single column.

[0010] Preferably, the support frame is composed of a plurality of steel pipes, and the bottom of the support frame is fixed to the fan-shaped wing plate by welding.

[0011] Preferably, six fan-shaped wing panels are provided, with a radius of half the tube skirt and a thickness of 20 to 60 mm; there is a gap of 1 to 2 m between adjacent fan-shaped wing panels; and adjacent fan-shaped wing panels are connected by hinges.

[0012] Preferably, the fan-shaped wing plate is flush with the top of the tube skirt; the fan-shaped wing plate and the tube skirt are connected by a one-way hinge connection, which allows the fan-shaped wing plate to only rotate upward around the edge of the tube skirt and cannot rotate downward.

[0013] Preferably, the airbag is provided with a sub-compartment; the sub-compartment is provided with a water inlet valve, and a Na2O2 preparation is placed in the sub-compartment; the airbag is also provided with a one-way air inlet valve and a one-way exhaust valve; the one-way air inlet valve is arranged inside the sub-compartment; the one-way exhaust valve is used to exhaust the gas in the airbag; when the cylindrical foundation is in a normal state, the airbag is in an empty state; when the cylindrical foundation is in a correction state, seawater enters the sub-compartment through the water inlet valve and reacts with the Na2O2 preparation to generate a large amount of gas, and the gas enters the airbag through the one-way air inlet valve, causing the airbag to inflate and expand rapidly.

[0014] Preferably, a plurality of cylinder side pressure sensors and a plurality of cylinder top pressure sensors are respectively provided on the side wall and the top of the cylinder skirt.

[0015] Preferably, it also includes a grouting pipeline for grouting and solidifying the soil at a location with lower pressure around the barrel foundation.

[0016] Preferably, the grouting pipeline is provided with a grouting port outside the barrel wall.

[0017] Preferably, the grouting pipeline is provided with a top grouting port.

[0018] The deviation correction method implemented by the above-mentioned offshore wind power cylinder foundation air pressure leveling and deviation correction system includes the following steps:

[0019] 1) Air pressure leveling: When the barrel foundation tilts, the airbag is inflated to generate a force that pushes the fan-shaped wing plate upward. When the fan-shaped wing plate moves upward, it pushes the reaction beam to move, thereby pushing the single column to move to level and correct the barrel foundation;

[0020] 2) Grouting reinforcement: After the air pressure leveling is completed, grouting is performed through the grouting pipe to the top of the cylinder and / or the outside of the cylinder wall on the side with lower pressure to solidify the soil in contact with the cylinder, thereby increasing the resistance of the soil on the side with lower pressure. After the slurry solidifies, the gas in the air bag is discharged to achieve recyclable correction.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention proposes an offshore wind power cylindrical foundation air pressure leveling and correction system and correction method, the system has the function of preventing tilting and adjusting the cylindrical foundation after tilting. This device enhances the adaptability and safety of the cylindrical foundation in soft geology, expands the application scope of the cylindrical foundation, and enables the installation of cylindrical foundation in geology that does not meet the requirements of cylindrical foundation. Especially for soft soil, the cylindrical foundation is used instead of the pipe frame pile foundation, and there is no need to drive piles deeply, which further reduces the construction cost of offshore wind power foundation.

[0023] The offshore wind power cylindrical foundation air pressure leveling and deviation correction system provided by the present invention increases the contact area between the cylindrical foundation and the soil through the outer fan-shaped wing plate, and enhances the anti-overturning ability of the cylindrical foundation under normal conditions. When the pressure sensor senses that the pressure on the top of the cylinder and the outside of the cylinder on one side has changed significantly, the airbag water inlet valve on this side is opened to control the seawater to enter the reagent cabin to react with the Na2O2 agent, generate gas to inflate the airbag to push the fan-shaped wing plate, and push the reaction beam through the support frame to apply thrust to the single column, thereby correcting the cylindrical foundation. The air pressure in the airbag is controlled by controlling the water intake, and the air pressure in the airbag is monitored in real time. After the cylindrical foundation is corrected, the gap between the cylinder and the soil after the correction is detected by the pressure sensors on the top of the cylinder and the skirt of the cylinder, and the gap is filled with grouting through the reserved grouting pipe, and the top of the cylinder and the soil around the cylinder of the cylindrical foundation are hardened and reinforced, so that the cylindrical foundation remains stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural elevation diagram of the offshore wind turbine cylinder foundation air pressure leveling and deviation correction system of the present invention;

[0025] Figure 2 It is a cross-sectional view of the offshore wind power cylinder-type foundation air pressure leveling and deviation correction system of the present invention;

[0026] Figure 3 It is a top view of the air pressure leveling and deviation correction system for the offshore wind power cylinder-type foundation of the present invention;

[0027] Figure 4This is a large-scale drawing of the inflatable bag of the offshore wind turbine cylinder-type foundation air pressure leveling and deviation correction system of the present invention;

[0028] Figure 5 It is a schematic diagram of a one-way hinge connection of the air pressure leveling and deviation correction system for the offshore wind power cylinder-type foundation of the present invention;

[0029] Figure numerals: 1. tube skirt; 2. single column; 3. diagonal brace; 4. fan-shaped wing plate; 5. support frame; 6. reaction beam; 7. collar; 8. air bag; 81. inflatable air bag; 9. water inlet valve; 10. compartment; 11. one-way hinge connection; 12. tube side pressure sensor; 13. tube top pressure sensor; 14. one-way air inlet valve; 15. one-way exhaust valve; 16. grouting pipe; 17. outer grouting port of tube wall; 18. grouting port of tube top; 19. hinge. DETAILED DESCRIPTION

[0030] The following is a detailed description of the implementation of the present invention in conjunction with the accompanying drawings, but they do not constitute a limitation of the present invention and are only given as examples. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0031] like Figure 1-3 The figure shows an offshore wind power cylindrical foundation air pressure leveling and deviation correction system of the present invention, which is composed of a cylindrical skirt 1, a single column 2, a diagonal brace 3, a fan-shaped wing plate 4, a one-way hinge connection 11, a support frame 5, a reaction beam 6, a collar 7, a pressure sensor, an airbag 8, etc. The cylindrical skirt 1, the single column 2, and the diagonal brace 3 constitute the cylindrical foundation body. The single column 2 is arranged on the cylindrical skirt 1, and the diagonal brace 3 is located between the single column 2 and the cylindrical skirt 1. The cylindrical skirt 1 is a steel cylindrical skirt. The diagonal brace 3 is preferably an I-shaped diagonal brace, and six of them are arranged. The pressure sensor includes a cylinder side pressure sensor 12 and a cylinder top pressure sensor 13.

[0032] There are multiple fan-shaped wing plates 4 distributed on the outside of the tube skirt 1, which increases the contact area between the tube foundation and the soil and enhances the anti-overturning ability of the tube foundation under normal conditions. There are six fan-shaped wing plates 4, which are steel structures, and their radius is half of the tube skirt 1, the thickness is 20-60mm, and there is a gap of 1-2m between adjacent fan-shaped wing plates 4. Adjacent fan-shaped wing plates 4 are connected by two hinges 19. Support frames 5 are provided on the fan-shaped wing plates 4. The support frames 5 are composed of several steel pipes and are used to support the reaction beams 6. The bottom of the support frames 5 is fixed to the fan-shaped wing plates 4 by welding.

[0033] The support frame 5 is preferably formed by welding 9 circular steel pipes, wherein 5 steel pipes are welded to form a "sun"-shaped frame, and the other 4 steel pipes are welded to connect the fan-shaped wing plate 4 to the "sun"-shaped frame.

[0034] Each support frame 5 is equipped with a reaction beam 6, one end of which is installed on the support frame 5, and the other end is connected to the single column 2 through a collar 7; the collar 7 is movably sleeved on the single column 2. When the fan-shaped wing plate 4 moves upward, it will push the reaction beam 6 to move, thereby pushing the single column 2 to move to correct the deviation of the barrel foundation.

[0035] The reaction beam 6 is preferably a steel pipe with a tapered gradually changing cross-section, the diameter of the lower end of which is the same as the diameter of the steel pipe connected to it on the support frame 5, and the diameter of the upper part is 1 / 3 of the diameter of the single column 2.

[0036] An airbag 8 is provided under the fan-shaped wing plate 4, which is used to be inflated when the foundation is tilted to generate a force to push the fan-shaped wing plate 4 upward. The inflated airbag 81 is the inflated state of the airbag 8 when it is in the deviation correction state. Figure 4 As shown, a sub-chamber 10 is separately provided in the airbag 8 for placing the Na2O2 preparation; a one-way water inlet valve 9 is provided on the sub-chamber 10; the airbag 8 is in an empty state in a normal state; in the deviation correction state, seawater enters the sub-chamber 10 through the water inlet valve 9 on the airbag 8 to react with the Na2O2 preparation to produce a large amount of gas, and the reaction equation is: 2Na2O2+2H2O→4NaOH+O2, and the gas enters the airbag 8 through the one-way air inlet valve 14, so that the airbag 8 is rapidly inflated and expanded; the one-way air inlet valve 14 is provided on the airbag 8 and inside the sub-chamber 10; a one-way exhaust valve 15 is also provided on the airbag 8, which is used to exhaust the gas in the airbag 8 after the deviation correction is completed. The opening and closing of each valve can be specifically controlled by a control system, which is a prior art and will not be elaborated here.

[0037] Through the joint action of the airbag 8, the fan-shaped wing plate 4, the support frame 5, the reaction beam 6, and the collar 7, the force of the airbag 8 can be transmitted to the single column 2, thereby realizing the deviation correction of the barrel foundation.

[0038] The fan-shaped wing plate 4 and the tube skirt 1 are connected by a one-way hinge connection 11. Figure 5 The fan-shaped wing plate 4 is flush with the top of the tube skirt 1. After the fan-shaped wing plate 4 is 180 degrees with the top surface of the tube, it cannot continue to rotate downward. A plurality of tube side pressure sensors 12 are arranged on the outer periphery of the tube skirt 1 wall; a plurality of tube top pressure sensors 13 are arranged on the top of the tube skirt 1 to sense the pressure changes outside the tube periphery and under the fan-shaped wing plate 4.

[0039] The above-mentioned offshore wind power cylindrical foundation air pressure leveling grouting reinforcement and deviation correction system also includes a grouting pipeline 16, and the grouting pipeline 16 is provided with a cylindrical wall outer grouting port 17 and a cylindrical top grouting port 18.

[0040] The deviation correction method implemented by the above-mentioned offshore wind power cylinder foundation air pressure leveling and deviation correction system includes the following steps:

[0041] 1) Air pressure leveling: When the barrel foundation tilts, the airbag 8 is inflated to generate a force to push the fan-shaped wing plate 4 upward. When the fan-shaped wing plate 4 moves upward, it will push the reaction beam 6 to move, thereby pushing the single column 2 to move and level the barrel foundation;

[0042] 2) Grouting reinforcement: After the air pressure leveling is completed, grouting is performed through the grouting pipe 16 to the top of the cylinder and / or the outer side of the cylinder wall on the side with lower pressure to solidify the soil in contact with the cylinder body, thereby increasing the resistance of the soil on the side with lower pressure. After the slurry solidifies, the gas in the airbag 8 is discharged to achieve the recyclable correction.

[0043] The specific steps are as follows:

[0044] Combination Figure 2-3 As shown, when the pressure sensor sensing the pressure value on the outside of the cylinder wall and the bottom of the uninflated airbag 8 changes, a preliminary judgment is made. When the pressure on the outside of the cylinder wall increases, it means that the cylinder skirt 1 begins to have the risk of tilting to this side. If the pressure value under the fan-shaped wing plate 4 also increases, it means that there is no obvious scouring on this side; if the pressure sensing value under the fan-shaped wing plate 4 becomes smaller, it means that there is a more obvious scouring under the fan-shaped wing plate 4, causing a cavity under the fan-shaped wing plate 4. This situation causes a greater risk of continued tilting.

[0045] When it is determined that the foundation begins to tilt, open the water inlet valve 9 to allow seawater to gradually flow into the sub-chamber 10. The Na2O2 preparation reacts with water to produce a large amount of gas, which enters the air bag 8 through the one-way air inlet valve 14. The amount of gas produced can be controlled by controlling the inflow of water. When scouring occurs, it is necessary to increase the water intake to increase the volume and pressure of the air bag 8 so that the air bag 8 can fill the gap caused by scouring after inflation.

[0046] like Figure 2 As shown, when the airbag 8 is inflated to a certain pressure value, the airbag 8 begins to press the fan-shaped wing plate 4 upward, and the fan-shaped wing plate 4 rotates upward around the one-way hinge connection 11 under the pressure from the bottom. At this time, the support frame 5 on the fan-shaped wing plate 4 begins to push the reaction beam 6, and the top of the reaction beam 6 presses against the collar 7. The single column 2 moves in the opposite direction of the tilt under the thrust of the reaction beam 6 and the collar 7, thereby driving the foundation as a whole to gradually return to its original position. When the horizontality of the top surface of the foundation reaches the normal operation requirement, the water inlet valve 9 is closed to stop the reaction and inflation. At this time, the air pressure in the airbag 8 is kept stable. When the air pressure in one side of the airbag 8 is relatively high, the air can be exhausted and the pressure can be reduced. At this time, the purpose of foundation anti-tilt correction is achieved.

[0047] After the cylinder foundation is straightened, the change in the pressure value transmitted back by the pressure sensors at the cylinder top and outside the cylinder wall can be used to determine whether there is separation and a gap between the cylinder top and the outer cylinder wall and the soil. Grouting is performed through the spraying port at the end of the grouting pipe 16 to the cylinder top and / or the outer wall of the cylinder on the side with lower pressure, so as to solidify the soil in contact with the cylinder and thus improve the soil resistance on the weak side. After the slurry solidifies, the gas in the airbag 8 is discharged through the one-way exhaust valve 15 arranged on the top surface of the fan-shaped wing plate 4, so as to realize the recyclable utilization of the correction.

[0048] The above descriptions illustrate the basic principles and main structural features of the present invention. The present invention is not limited to the above examples. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0049] Other parts not described belong to the prior art.

Claims

1. An offshore wind power cylindrical foundation air pressure leveling and deviation correction system, comprising a cylindrical skirt (1), a single column (2) and a diagonal brace (3), characterized in that: A plurality of fan-shaped wing plates (4) are distributed on the outer side of the tube skirt (1); an inflatable air bag (8) is arranged under the fan-shaped wing plate (4); when the tube foundation tilts, the air bag (8) will be inflated to correct the deviation of the tube foundation; a reaction beam (6) is arranged on the fan-shaped wing plate (4), and the reaction beam (6) is connected to the single column (2); The fan-shaped wing plate (4) is flush with the top of the tube skirt (1); the fan-shaped wing plate (4) and the tube skirt (1) are connected by a one-way hinge connection member (11), and this connection mode enables the fan-shaped wing plate (4) to only rotate upward around the edge of the tube skirt (1) but not to rotate downward; The airbag (8) is provided with a sub-chamber (10); the sub-chamber (10) is provided with a water inlet valve (9), and a Na2O2 preparation is placed in the sub-chamber (10); the airbag (8) is also provided with a one-way air inlet valve (14) and a one-way exhaust valve (15); the one-way air inlet valve (14) is arranged inside the sub-chamber (10); the one-way exhaust valve (15) is used to exhaust the gas in the airbag (8); when the cylindrical foundation is in a normal state, the airbag (8) is in an empty state; when the cylindrical foundation is in a deviation correction state, seawater enters the sub-chamber (10) through the water inlet valve (9) and reacts with the Na2O2 preparation to generate a large amount of gas, and the gas enters the airbag (8) through the one-way air inlet valve (14), so that the airbag (8) is rapidly inflated and expanded.

2. The offshore wind power cylinder foundation air pressure leveling and deviation correction system according to claim 1 is characterized by: A support frame (5) is provided on the fan-shaped wing plate (4); one end of the reaction beam (6) is mounted on the support frame (5), and the other end is connected to the single column (2) via a sleeve ring (7); the sleeve ring (7) is movably sleeved on the single column (2).

3. The offshore wind power cylinder foundation air pressure leveling and deviation correction system according to claim 2 is characterized by: The support frame (5) is composed of a plurality of steel pipes, and the bottom of the support frame (5) is fixed on the fan-shaped wing plate (4) by welding.

4. The offshore wind turbine cylinder foundation air pressure leveling and deviation correction system according to claim 1 is characterized by: The fan-shaped wing plates (4) are provided in six pieces, each of which has a radius of half the tube skirt (1) and a thickness of 20 to 60 mm; there is a gap of 1 to 2 m between adjacent fan-shaped wing plates (4); and adjacent fan-shaped wing plates (4) are connected by hinges (19).

5. The offshore wind turbine cylinder foundation air pressure leveling and deviation correction system according to claim 1 is characterized by: A plurality of cylinder side pressure sensors (12) and a plurality of cylinder top pressure sensors (13) are respectively arranged on the side wall and the top of the cylinder skirt (1).

6. The offshore wind turbine cylinder foundation air pressure leveling and deviation correction system according to claim 1 is characterized by: It also includes a grouting pipeline (16) for grouting and solidifying the soil at a location with lower pressure around the barrel foundation.

7. The offshore wind turbine cylinder foundation air pressure leveling and deviation correction system according to claim 6 is characterized by: The grouting pipeline (16) is provided with a grouting port (17) outside the wall.

8. The offshore wind turbine cylinder foundation air pressure leveling and deviation correction system according to claim 6 is characterized by: The grouting pipeline (16) is provided with a top grouting port (18).

9. The deviation correction method implemented by the offshore wind power cylinder foundation air pressure leveling and deviation correction system according to claim 6 is characterized in that: The following steps are involved: 1) Air pressure leveling: When the barrel foundation tilts, the airbag (8) is inflated to generate a force that pushes the fan-shaped wing plate (4) to move upward. When the fan-shaped wing plate (4) moves upward, it pushes the reaction beam (6) to move, thereby pushing the single column (2) to move to level and correct the barrel foundation; 2) Grouting reinforcement: After the air pressure leveling is completed, grouting is performed through the grouting pipe (16) to the top of the cylinder and / or the outer side of the cylinder wall on the side with lower pressure, so as to solidify the soil in contact with the cylinder body and thus improve the resistance of the soil on the side with lower pressure. After the slurry solidifies, the gas in the air bag (8) is discharged to achieve the recyclable use of deviation correction.

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