A top-supported barrel foundation for offshore wind power

Abstract

The present invention relates to the technical field of offshore wind power foundations, specifically to an offshore wind power top-supported barrel foundation, comprising a barrel and a steel transition section, wherein a plurality of first diagonal brace steel pipes are arranged around the steel transition section; a plurality of support bases are arranged on the top cover of the barrel, wherein an inclined guide cylinder is fixed on the support base, wherein a diagonal brace cylinder whose lower end can be inserted into the seabed is slidably arranged in the guide cylinder, wherein an annular air film is fixedly sleeved on the diagonal brace cylinder, wherein a first inflation mechanism is arranged in the diagonal brace cylinder; a horizontal barrel is fixed on the diagonal brace cylinder, wherein an arc-shaped horizontal pressure plate is fixed below the horizontal barrel, wherein an arc-shaped air bag is arranged below the arc-shaped horizontal pressure plate, wherein a second inflation mechanism for inflating the arc-shaped air bag is arranged in the diagonal brace cylinder. The offshore wind power top-supported barrel foundation can monitor the stress condition of the entire barrel foundation in real time, and buffer and reduce the stress of the entire barrel foundation, while improving the anti-overturning ability of the entire barrel foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power foundations, and in particular to an offshore wind power top-supported cylindrical foundation. Background Art

[0002] At present, the built offshore wind farms are mainly located near the coast, and the installed wind turbines have relatively small power. However, as offshore wind farms gradually develop towards deep sea and large-megawatt wind turbines, higher requirements are placed on the bearing performance of offshore wind power foundations. At the same time, site conditions have a great impact on the bearing performance of offshore wind power foundations.

[0003] At present, offshore wind power foundation types mainly include gravity type, single and multi-pile caps, jackets, multi-legs, simple foundations and floating types, such as Figure 1 As shown in the figure, there are various types of foundations for offshore wind power, among which the cylinder foundation can be divided into single cylinder and multi-cylinder structures ( Figure 2 , from left to right are single-tube, three-tube and four-tube foundations), is a type of foundation developed for marine engineering in the past 30 years. The tube foundation is shaped like a steel tube with its mouth turned downward. It is sunk into the seabed and reaches the designed depth by its own weight, negative pressure, loading or assisted by water jetting, diversion and other measures. The transition section is from the top of the tube to the tower. The transition section can be of straight column type, catheter frame type, tripod type, hexagonal frame type and arc transition type.

[0004] The barrel foundation has the advantages of low cost, easy transportation and installation, and short on-site construction time. Benefiting from the construction method of the barrel foundation, the barrel foundation is relatively cheap to disassemble and recycle, and is easy to disassemble and recycle, which has obvious advantages over other foundation types. In 2014, Tianjin University independently proposed a new barrel foundation structure with single barrel and multiple compartments, which broke through the stress characteristics of traditional foundations, realized the bearing capacity of the barrel top, and the bearing capacity of the barrel skirt and surrounding soil (Jian Lian et al. 2014; Meimei Liu et al., 2014; Puyang Zhang et al., 2014), creating a new era of offshore wind power foundation engineering technology. The new barrel foundation structure can be a full concrete structure, a full steel structure, or a steel-concrete composite structure.

[0005] In addition, Chinese patent CN108222058B discloses a barrel foundation with an adjustable anti-buckling device and its construction method. The barrel foundation disclosed in the patent mainly includes a steel barrel skirt 1, a concrete top cover 2, a compartment plate 3 and an adjustable anti-buckling device 4. The steel barrel skirt 1 is a circular thin-walled steel structure with a diameter of 30m and a height of 10m, and the skirt plate is 25mm thick; the concrete top cover 2 is fixedly connected to the top of the steel barrel skirt 1 and has a height of 2m. A regular hexagon with an external radius of 7.5m and a compartment plate 3 extending from each vertex of the regular hexagon to the steel barrel skirt 1 are arranged in the space formed by the steel barrel skirt 1 and the concrete top cover 2. The compartment plate 3 is divided into seven compartments arranged in a honeycomb shape, and the thickness of the compartment plate 3 is 15mm. This typical wide and shallow foundation uses the compartment plate to make the soil inside the barrel and the barrel foundation form an "integral block" to bear the upper load together and realize "barrel top bearing". Regardless of the type of offshore wind power foundation, the foundation structure of the offshore wind turbine will be affected by various environmental loads such as wind load, wave force, ice load, water flow force and impact force, and the horizontal load it bears is large. Due to the influence of water depth, the cantilever section of the foundation structure above the mud surface is longer, and its overturning moment is also greater. Under the action of a long time, the wind power foundation will tilt. Once the tilt angle is too large, the center of gravity of the entire offshore wind power will shift, which will cause the entire offshore wind power device to overturn, causing huge losses. Therefore, a reasonable design of the foundation structure is of great significance to structural safety and engineering cost. Based on this, the present application proposes an offshore wind power top-supported barrel foundation to solve the above problems. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an offshore wind power top-supported barrel foundation, which can monitor the stress conditions of the entire barrel foundation in real time, buffer and reduce the stress of the entire barrel foundation, and at the same time improve the anti-overturning ability of the entire barrel foundation.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an offshore wind power top-supported cylindrical foundation, comprising a cylindrical body at the bottom and a steel transition section for transmitting force at the top, a plurality of first diagonal bracing steel pipes are evenly arranged around the steel transition section, a compartment plate is arranged inside the cylindrical body to divide the cylindrical body into a main compartment located in the middle and a plurality of side compartments evenly arranged around the main compartment; a plurality of support bases are evenly arranged in a ring shape with the steel transition section as the center on the top cover of the cylindrical body, an inclined guide cylinder is fixed on the support base, and a sliding device is arranged inside the guide cylinder. A diagonal support tube is provided, the lower end of which can be inserted into the seabed, the diagonal support tube is fixedly sleeved with an annular air film, and the diagonal support tube is provided with a first inflation mechanism for inflating the annular air film; a horizontal tube extending out of the tube is fixed on the diagonal support tube, an arc-shaped horizontal pressure plate is fixed below the horizontal tube, an arc-shaped airbag is provided below the arc-shaped horizontal pressure plate, and a second inflation mechanism for inflating the arc-shaped airbag is provided inside the diagonal support tube. When the diagonal support tube is inserted into the seabed, the arc-shaped horizontal pressure plate fits against the seabed, the arc-shaped airbag is inflated and squeezed against the seabed surface, thereby reducing the overturning moment of the cylinder.

[0008] Furthermore, a second diagonal brace steel pipe is provided between the plurality of support bases and the plurality of first diagonal brace steel pipes respectively, the upper surface of the support base is an inclined surface, the lower end of the diagonal brace tube is a conical portion that can be inserted into the seabed, and the guide tube is gap-matched with the diagonal brace tube.

[0009] Furthermore, the central axes of the plurality of diagonal support cylinders and the central axis of the horizontal cylinder intersect at one point respectively, and the plurality of arc-shaped horizontal pressure plates are distributed in a circular shape with equal angles around the steel transition section as the center.

[0010] Furthermore, two partitions are fixed inside the diagonal support tube, a plurality of through holes are opened on the diagonal support tube and located between the two partitions, the annular air film is sleeved on the diagonal support tube and covers the through holes, two fixing components are provided on the outside of the diagonal support tube, which respectively fix the two ends of the annular air film and seal it with the diagonal support tube, and an expansion space is formed between the annular air film and the two partitions.

[0011] Furthermore, the fixing assembly includes a rotating threaded ring which is sleeved on the outside of the diagonal support tube and threadedly connected to the diagonal support tube, an annular clamping block fixed on the outside of the diagonal support tube, and an abutting ring which is fixed on the end edge of the rotating threaded ring and abuts against the annular clamping block, and the annular air film is placed between the annular clamping block and the abutting ring.

[0012] Furthermore, the abutting surfaces of the annular block and the abutting ring are inclined surfaces that fit each other, and the outer side of the diagonal support tube is also provided with two reinforcement components for respectively reinforcing the two ends of the annular air film. The reinforcement component includes a fixing ring movably sleeved on the outer side of the diagonal support tube and a fixing bolt connected to the fixing ring bolt and one end of which passes through between the fixing ring and the diagonal support tube, the inserted end of the fixing bolt abuts against the annular air film, and the outer side wall of the diagonal support tube is also provided with two liquid annular grooves close to the two ends of the annular air film, into which a colloid can be injected to bond the annular air film to the diagonal support tube to achieve sealing and fixation.

[0013] Furthermore, the first inflation mechanism includes a first suction pipe that passes through one end from the outside to the inside of the diagonal support tube and is used to evacuate or supply air to the expansion space, and a first control valve fixed on the first suction pipe. The first suction pipe passes through between two partitions, and a first pressure sensor is fixed on the partition to detect the pressure in the expansion space.

[0014] Furthermore, the second inflation mechanism includes a connecting tube whose lower end is located in the arc-shaped airbag and whose upper end passes through and extends into the horizontal cylinder, a second suction tube whose one end is connected to the upper end of the connecting tube and whose other end passes through the horizontal cylinder and the diagonal support cylinder in sequence and extends to the outside, and a second control valve fixed on the second suction tube. A monitoring tube with a top end passing through and extending into the horizontal cylinder is connected to the top of the arc-shaped airbag, and a second pressure sensor for detecting the pressure in the arc-shaped airbag is fixed to the upper end of the monitoring tube.

[0015] Furthermore, a plurality of fan-shaped compartments are provided on the top cover of the cylinder body, and the plurality of fan-shaped compartments correspond to a plurality of side compartments respectively. A first extraction pipe is provided above the fan-shaped compartment, the bottom end of which penetrates the fan-shaped compartment and extends into the side compartment. A discharge pipe is connected to the outside of the fan-shaped compartment. A second extraction pipe is provided in the fan-shaped compartment, the bottom end of which penetrates into the side compartment and extends into the side compartment. A first extraction control valve, a discharge control valve and a second extraction control valve are provided on the first extraction pipe, the discharge pipe and the second extraction pipe respectively, and an exhaust pipe and an inflation pipe are provided on the fan-shaped compartment.

[0016] Furthermore, a second fixing groove is opened at the upper end of the diagonal brace tube, a second tie rod is fixed in the second fixing groove, a plurality of first fixing grooves are opened on the outer wall of the steel transition section, a first tie rod is fixed in the first fixing groove, and slings are tied between the plurality of the first tie rods and the second tie rods for fixing the diagonal brace tube before installation.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0018] 1. For the offshore wind power top-supported barrel foundation, when the barrel body is completely sunk, the diagonal brace barrel slides to insert the conical part into the seabed. At this time, the arc-shaped airbag under the arc-shaped horizontal pressure plate fits with the seabed surface. The first inflation mechanism and the second inflation mechanism can be started to inflate the annular air film and the arc-shaped airbag respectively. After the annular air film is inflated, it will squeeze the surrounding soil, thereby making the integrity between the diagonal brace barrel and the soil stronger, and further making the entire barrel foundation more stable after installation. After the multiple arc-shaped airbags are inflated, they can squeeze the seabed surface, further ensuring the horizontal stability of the entire barrel foundation. At the same time, when the entire barrel foundation is subjected to various environmental loads or a large overturning moment, the inflated annular air film and the arc-shaped airbag can buffer and reduce the force of the entire barrel foundation, thereby preventing the entire barrel foundation from overturning.

[0019] 2. The offshore wind power top-supported barrel foundation can monitor the stress of the annular air film and the arc-shaped air bag after expansion in real time by setting the first pressure sensor and the second pressure sensor. When the entire barrel foundation is subjected to various environmental loads, the entire barrel foundation is subjected to stress vibration, and the stress of the annular air film and the arc-shaped air bag at different positions changes after expansion. According to these changes, the stress of the entire barrel foundation can be judged in real time. Secondly, in conjunction with the first control valve, the second control and the pneumatic equipment, the expansion degree of the annular air film and the arc-shaped air bag at different positions can be reversely controlled, or only the expansion degree of the arc-shaped air bag can be controlled, thereby buffering and shock absorbing the entire barrel foundation, and improving the anti-overturning ability at the same time;

[0020] 3. For the top-supported cylindrical foundation of offshore wind power, under the action of ocean current and air flow, one side of the entire cylindrical foundation is subjected to long-term stress, which will generate an upward pulling force on the cylinder, and the cylinder will use the internal and external pressure difference to generate an anti-pullout force to prevent the cylinder from being pulled out from the seabed. However, when one side is subjected to long-term stress, the water on the seabed will slowly enter the cylinder to fill some space on the top of the cylinder. When the ocean current and air flow tend to be stable, the fan-shaped cabin can be used to reset the pulled-out cylinder to ensure the horizontal stability of the entire cylindrical foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a diagram of various foundation types of offshore wind power in the prior art;

[0022] Figure 2 Various types of cylindrical foundations for offshore wind power in the prior art;

[0023] Figure 3 It is a schematic diagram of the structure of the present invention;

[0024] Figure 4 It is a top view schematic diagram of the arc-shaped horizontal pressing plate of the present invention;

[0025] Figure 5It is a schematic diagram of the interior of the horizontal cylinder and the diagonal support cylinder of the present invention;

[0026] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0027] Figure 7 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0028] Figure 8 It is a schematic diagram of the interior of the fan-shaped cabin and the cylinder of the present invention;

[0029] Fig. 9 This is a schematic diagram of the diagonal support tube of the present invention after being inserted into the seabed;

[0030] Fig.10 It is a structural schematic diagram of the horizontal support tube of the present invention;

[0031] In the figure: 1, cylinder; 2, steel transition section; 3, support base; 4, guide cylinder; 5, diagonal support cylinder; 6, horizontal cylinder; 601, horizontal support cylinder; 7, arc-shaped horizontal pressure plate; 8, arc-shaped airbag; 9, cone-shaped part; 10, first diagonal support steel pipe; 11, second diagonal support steel pipe; 12, suction main pipe; 13, first suction pipe; 14, second suction pipe; 15, second control valve; 16, first control valve; 17, connecting pipe; 18, monitoring pipe; 19, second pressure sensor; 20, partition; 21, first pressure sensor; 22, through hole; 23, annular Air film; 24, fixing ring; 25, fixing bolt; 26, annular block; 27, rotating threaded ring; 28, abutment ring; 29, liquid annular groove; 30, fan-shaped cabin; 31, compartment plate; 32, second extraction pipe; 33, second extraction control valve; 34, exhaust pipe; 35, inflation pipe; 36, first extraction pipe; 37, first extraction control valve; 38, discharge pipe; 39, discharge control valve; 40, first fixing groove; 41, first tie rod; 42, extrusion cone; 43, guide pulley; 44, second fixing groove; 45, second tie rod; 46, sling. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 3-5A top-supported cylindrical foundation for offshore wind power comprises a cylindrical body 1 at the bottom and a horizontal cylinder 6 for transmitting force from the top, a plurality of first diagonal bracing steel pipes 10 are evenly arranged around the steel transition section 2, a compartment plate 31 is arranged in the cylindrical body 1, and is used to divide the cylindrical body 1 into a main cabin located in the middle and a plurality of side cabins evenly arranged around the main cabin, wherein the number of first diagonal bracing steel pipes 10 is 6-12 and evenly arranged around the steel transition section 2, and the angle between the first diagonal bracing steel pipe 10 and the axis of the steel transition section 2 is 30-60°, the cylindrical body 1 is a full steel structure, 6-12 I-beam main beams are evenly arranged radially on the top cover of the cylindrical body 1, and 3-6 I-beam ring beams are arranged circumferentially, wherein a supporting steel plate is provided at the junction of the I-beam ring beam and the I-beam main beam, and stiffening ribs are provided on the I-beam main beam, the I-beam ring beam and the supporting steel plate.

[0034] In addition, a plurality of support bases 3 are provided on the top cover of the cylinder body 1 and are evenly arranged in a ring shape with the steel transition section 2 as the center. An inclined guide cylinder 4 is fixed on the support base 3. An inclined support cylinder 5 is slidably provided in the guide cylinder 4, and a lower end of which can be inserted into the seabed is slidably provided. An annular air film 23 is fixedly sleeved on the inclined support cylinder 5. A first inflation mechanism is provided in the inclined support cylinder 5 for inflating the annular air film 23. A horizontal cylinder 6 extending outward from the cylinder body 1 is fixed on the inclined support cylinder 5. An arc-shaped horizontal pressure plate 7 is fixed below the horizontal cylinder 6. An arc-shaped air bag 8 is provided below the arc-shaped horizontal pressure plate 7. A second inflation mechanism is provided in the inclined support cylinder 5 for inflating the arc-shaped air bag 8. When the inclined support cylinder 5 is inserted into the seabed, the arc-shaped horizontal pressure plate 7 fits against the seabed, and the arc-shaped air bag 8 is inflated and squeezed against the seabed surface to reduce the overturning moment of the cylinder body 1.

[0035] Among them, a second diagonal brace steel pipe 11 is provided between the multiple support bases 3 and the multiple first diagonal brace steel pipes 10, and the second diagonal brace steel pipe 11 is used to make the base, diagonal brace tube 5, cylinder body 1 and steel transition section 2 more integrated. The upper surface of the support base 3 is an inclined surface, and the lower end of the diagonal brace tube 5 is a conical portion 9 that can be inserted into the seabed. The guide tube 4 and the diagonal brace tube 5 are clearance-matched, and the diagonal brace tube 5 can slide linearly in the guide tube 4. The sliding of the diagonal brace tube 5 can make the conical portion 9 inserted into the seabed. The central axis of the multiple diagonal brace tubes 5 and the central axis of the horizontal tube 6 intersect at one point respectively, and the multiple arc-shaped horizontal pressure plates 7 are distributed in a circular shape with equal angles with the steel transition section 2 as the center, so as to make the force of the entire foundation more balanced.

[0036] During specific operation, after the cylinder 1 has completely sunk, the diagonal support cylinder 5 slides to insert the conical portion 9 into the seabed. At this time, the arc-shaped airbag 8 below the arc-shaped horizontal pressure plate 7 fits with the seabed surface, and then the first inflation mechanism and the second inflation mechanism can be activated to inflate the annular air film 23 and the arc-shaped airbag 8 respectively. After the annular air film 23 expands, it will squeeze the surrounding soil, thereby making the integrity between the diagonal support cylinder 5 and the soil stronger, and further making the entire cylinder foundation more stable after installation. After the multiple arc-shaped airbags 8 are inflated, they can squeeze the seabed surface, further ensuring the horizontal stability of the entire cylinder foundation. At the same time, when the entire cylinder foundation is subjected to various environmental loads or a large overturning moment, the inflated annular air film 23 and the arc-shaped airbag 8 can buffer and reduce the force on the entire cylinder foundation, thereby preventing the entire cylinder foundation from overturning. It should be noted that in order to keep the arc-shaped horizontal pressure plate 7 horizontal and stable, such as Fig.10 As shown, a plurality of horizontal support tubes 601 may extend from the horizontal tube 6 , and the horizontal support tubes 601 are fixed to the arc-shaped horizontal pressing plate 7 to form a multi-point fixed support for the arc-shaped horizontal pressing plate 7 , thereby ensuring the horizontal stability of the arc-shaped horizontal pressing plate 7 .

[0037] Please refer to Figure 3 and Fig. 9 Before the cylinder 1 is completely sunk, the diagonal support cylinder 5 should be in a hoisting state, thereby ensuring the smooth sinking of the cylinder 1. Specifically, a second fixing groove 44 is opened at the upper end of the diagonal support cylinder 5, and a second tie rod 45 is fixed in the second fixing groove 44. A plurality of first fixing grooves 40 are opened on the outer wall of the steel transition section 2, and a first tie rod 41 is fixed in the first fixing groove 40. A sling 46 is tied between the plurality of first tie rods 41 and the second tie rod 45 to fix the diagonal support cylinder 5 before installation. The plurality of diagonal support cylinders 5 are hoisted by the sling 46, so that the diagonal support cylinder 5 is in a state before sliding downward. After the cylinder 1 is completely sunk, the sling 46 can be untied, and then the diagonal support cylinder 5 can slide downward in the guide cylinder 4, as shown in FIG. Fig. 9 As shown, because the diagonal support tube 5 is tilted downward at 45 degrees, a conical extrusion cone 42 is used to move downward, and multiple diagonal support tubes 5 are extruded at the same time, so that multiple diagonal support tubes 5 are simultaneously subjected to force and slide downward in the guide tube 4, and the extrusion cone 42 can be provided with a cylindrical hollow portion along the center line, and multiple guide pulleys 43 uniformly distributed in an annular direction are fixed in the cylindrical hollow portion, and the steel transition section 2 runs through the cylindrical hollow portion. Multiple guide pulleys 43 are tightly fitted with the steel transition section 2. Through the setting of the guide pulley 43, the extrusion cone 42 can be linearly moved up and down along the steel transition section 2. During actual construction, after the extrusion cone 42 is installed, it is only necessary to apply a horizontal downward force to the extrusion cone 42 to achieve the final diagonal support tube 5 sliding downward in the guide tube 4.

[0038] See also Figure 5-7The annular air film 23 is inflated by the first inflation mechanism, and is sleeved on the diagonal support tube 5. Two partitions 20 are fixed inside the diagonal support tube 5. The diagonal support tube 5 is provided with a plurality of through holes 22 located between the two partitions 20. The annular air film 23 is sleeved on the diagonal support tube 5 and covers the through holes 22. Two fixing components are provided on the outside of the diagonal support tube 5, which respectively fix the two ends of the annular air film 23 and seal it with the diagonal support tube 5. An expansion space is formed between the annular air film 23 and the two partitions 20.

[0039] The fixing assembly includes a rotating threaded ring 27 sleeved on the outside of the diagonal support tube 5 and threadedly connected to the diagonal support tube 5, an annular clamping block 26 fixed on the outside of the diagonal support tube 5, and an abutting ring 28 fixed on the edge of the end of the rotating threaded ring 27 and abutting against the annular clamping block 26. The annular air film 23 is placed between the annular clamping block 26 and the abutting ring 28. The abutting surfaces of the annular clamping block 26 and the abutting ring 28 are inclined surfaces that fit each other. The outer side of the diagonal support tube 5 is also provided with two ends of the annular air film 23, respectively. A reinforcement component for fixing and reinforcing includes a fixing ring 24 movably sleeved on the outside of the diagonal support tube 5 and a fixing bolt 25 bolted to the fixing ring 24 and one end of which passes through between the fixing ring 24 and the diagonal support tube 5. The insertion end of the fixing bolt 25 abuts against the annular air film 23. The outer wall of the diagonal support tube 5 is also provided with two liquid-receiving annular grooves 29 close to the two ends of the annular air film 23, into which a colloid can be injected to bond the annular air film 23 to the diagonal support tube 5 to achieve sealing and fixation.

[0040] During installation, glue is applied to the liquid-receiving annular groove 29, and then the annular air film 23 is sleeved on the diagonal support tube 5. At the same time, the edges of the two ends of the annular air film 23 are placed between the annular clamping block 26 and the abutment ring 28. Then the annular air film 23 is flattened to fix the annular air film 23 and the diagonal support tube 5. The rotating threaded ring 27 is then screwed, and the rotating threaded ring 27 moves to drive the abutment ring 28 to move, and the annular clamping block 26 is cooperated to realize the secondary fixed sealing of the annular air film 23. Finally, the fixing bolt 25 is screwed into the fixing ring 24. The fixing bolt 25 abuts against the annular air film 23, further strengthening the installation of the annular air film 23 to prevent it from being displaced due to force.

[0041] The first inflation mechanism includes a first suction pipe 13 which passes through one end from the outside to the inside of the diagonal support tube 5 and is used to evacuate or supply air to the expansion space, and a first control valve 16 fixed on the first suction pipe 13. The first suction pipe 13 passes through between two partitions 20, and a first pressure sensor 21 for detecting the pressure in the expansion space is fixed on the partition 20. The second inflation mechanism includes a connecting pipe 17 whose lower end is located in the arc-shaped airbag 8 and whose upper end passes through and extends into the horizontal tube 6, a second suction pipe 14 which is connected to the upper end of the connecting pipe 17 at one end and passes through the horizontal tube 6 and the diagonal support tube 5 in turn at the other end and extends to the outside, and a second control valve 15 fixed on the second suction pipe 14. A monitoring pipe 18 which has a top end passing through and extending into the horizontal tube 6 is connected to the top of the arc-shaped airbag 8, and a second pressure sensor 19 for detecting the pressure in the arc-shaped airbag 8 is fixed to the upper end of the monitoring pipe 18.

[0042] It should be noted that the first suction pipe 13 and the second suction pipe 14 are both connected to external pneumatic equipment, and the external pneumatic equipment is operated to realize air extraction and inflation. At the same time, the first suction pipe 13 and the second suction pipe 14 can also be connected to the same suction main pipe 12, and the suction main pipe 12 is connected to the external pneumatic equipment, and the first control valve 16 and the second control valve 15 are used to realize the first suction pipe 13 and the second suction pipe 14. The gas extraction and inflation are respectively realized. In the above structure, the first pressure sensor 21 and the second pressure sensor 19 are set to detect the annular air film 23 and the arc air film. The stress on the bag 8 after expansion is monitored in real time. When the entire cylindrical foundation is subjected to various environmental loads, the entire cylindrical foundation is subjected to stress vibration. The annular air film 23 and the arc-shaped air bag 8 at different positions are subjected to stress changes after expansion. The stress condition of the entire cylindrical foundation can be judged in real time based on these changes. Secondly, in conjunction with the first control valve 16, the second control and the pneumatic equipment, the expansion degree of the annular air film 23 and the arc-shaped air bag 8 at different positions can be reversely controlled, or only the expansion degree of the arc-shaped air bag 8 can be controlled, thereby buffering and reducing shock on the entire cylindrical foundation and improving the anti-overturning ability.

[0043] Also, see Figure 3 and Figure 8 , a plurality of fan-shaped cabins 30 are arranged on the top cover of the cylinder 1, and the plurality of fan-shaped cabins 30 correspond to a plurality of side cabins respectively. A first extraction pipe 36 is arranged above the fan-shaped cabin 30, and the bottom end of the first extraction pipe 36 passes through the fan-shaped cabin 30 and extends into the side cabin. A discharge pipe 38 is connected to the outside of the fan-shaped cabin 30. A second extraction pipe 32 is arranged inside the fan-shaped cabin 30, and the bottom end of the second extraction pipe 32 passes through and extends into the side cabin. A first extraction control valve 37, a discharge control valve 39 and a second extraction control valve 33 are arranged on the first extraction pipe 36, the discharge pipe 38 and the second extraction pipe 32 respectively. An exhaust pipe 34 and an inflation pipe 35 are arranged on the fan-shaped cabin 30. It should be noted that the exhaust pipe 34 and the inflation pipe 35 are connected to external pneumatic equipment, and the exhaust and inflation of the exhaust pipe 34 and the inflation pipe 35 are realized by the operation of the external pneumatic equipment.

[0044] Under the action of ocean currents and air currents, one side of the entire cylindrical foundation is subjected to long-term stress, which will generate an upward pulling force on the cylinder 1, and the cylinder 1 will use the internal and external pressure difference to generate an anti-pull force to prevent the cylinder 1 from being pulled out from the seabed. However, when one side is subjected to long-term stress, the water in the seabed will slowly enter the cylinder 1 to fill some of the space on the top of the cylinder 1. When the ocean currents and air currents tend to be stable, the fan-shaped cabin 30 can be used to reset the cylinder 1 that has been pulled out.

[0045] After the installation of the entire cylindrical foundation structure is completed, the first extraction control valve 37 and the second extraction control valve 33 are closed and loaded, so that the cylinder 1 is in a sealed state. In the initial state, the fan-shaped cabin 30 is in an empty state, which can be a vacuum state or a state filled with seawater or air. The specific reset operation is as follows: the first step is to directly open the second extraction control valve 33 when the fan-shaped cabin 30 is in a vacuum state, so that the seawater or sand on the upper surface of the cylinder 1 can be pumped into the fan-shaped cabin 30 by means of the pressure difference between the fan-shaped cabin 30 and the cylinder 1, so that the cylinder 1 moves down and resets again. The second step is to close the second extraction control valve 33 when the first pressure sensor 21 detects that the value returns to normal, so that the cylinder 1 is in a sealed state again. The third step is to open the discharge control valve 39 and start the inflation pipe 35, so that the seawater and mud mixture entering the fan-shaped cabin 30 can be discharged from the discharge pipe 38 by means of air entering the fan-shaped cabin 30, and the discharge control valve 39 is closed after the discharge is completed. In the fourth step, the air in the fan-shaped cabin 30 is evacuated through the vacuum pump and the exhaust pipe 34 to restore the fan-shaped cabin 30 to a vacuum state. In the third step of exhausting, the air compressor and the vacuum pump can be used to repeatedly inflate and exhaust the fan-shaped cabin 30 so that seawater can repeatedly enter the fan-shaped cabin 30 through the exhaust pipe 38 to flush the fan-shaped cabin 30.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An offshore wind power top-supported cylindrical foundation, comprising a cylindrical body (1) at the bottom and a steel transition section (2) for transmitting force at the top, a plurality of first diagonal bracing steel pipes (10) being evenly arranged around the steel transition section (2), and a compartment plate (31) being arranged inside the cylindrical body (1) for dividing the inside of the cylindrical body (1) into a main compartment located in the middle and a plurality of side compartments evenly arranged around the main compartment; Features: The top cover of the cylinder (1) is provided with a plurality of support bases (3) which are evenly arranged in a ring shape with the steel transition section (2) as the center; an inclined guide cylinder (4) is fixed on the support base (3); a diagonal support cylinder (5) whose lower end can be inserted into the seabed is slidably arranged inside the guide cylinder (4); an annular air film (23) is fixedly sleeved on the diagonal support cylinder (5); a first inflation mechanism is provided inside the diagonal support cylinder (5) for inflating the annular air film (23); A horizontal cylinder (6) extending outward from the cylinder body (1) is fixed on the diagonal support cylinder (5), an arc-shaped horizontal pressure plate (7) is fixed below the horizontal cylinder (6), an arc-shaped air bag (8) is provided below the arc-shaped horizontal pressure plate (7), and a second inflation mechanism for inflating the arc-shaped air bag (8) is provided inside the diagonal support cylinder (5). When the diagonal support cylinder (5) is inserted into the seabed, the arc-shaped horizontal pressure plate (7) fits against the seabed, and the arc-shaped air bag (8) is inflated and pressed against the seabed surface, thereby reducing the overturning moment of the cylinder body (1).

2. The offshore wind power top-supported barrel foundation according to claim 1, characterized in that: A second diagonal brace steel pipe (11) is provided between each of the plurality of support bases (3) and the plurality of first diagonal brace steel pipes (10); the upper surface of the support base (3) is an inclined surface; the lower end of the diagonal brace tube (5) is a conical portion (9) that can be inserted into the seabed; and the guide tube (4) and the diagonal brace tube (5) are clearance-matched.

3. The offshore wind power top-supported barrel foundation according to claim 2, characterized in that: The central axes of the plurality of diagonal support cylinders (5) and the central axis of the horizontal cylinder (6) intersect at one point respectively, and the plurality of arc-shaped horizontal pressure plates (7) are distributed in a circular shape at equal angles with the steel transition section (2) as the center.

4. The offshore wind power top-supported barrel foundation according to claim 3, characterized in that: Two partitions (20) are fixed inside the diagonal support tube (5), a plurality of through holes (22) are opened on the diagonal support tube (5) and are located between the two partitions (20), the annular air film (23) is sleeved on the diagonal support tube (5) and covers the through holes (22), and two fixing components are provided on the outer side of the diagonal support tube (5) for fixing the two ends of the annular air film (23) respectively and sealing the annular air film with the diagonal support tube (5), and an expansion space is formed between the annular air film (23) and the two partitions (20).

5. The offshore wind power top-supported barrel foundation according to claim 4, characterized in that: The fixing assembly comprises a rotating threaded ring (27) sleeved on the outside of the diagonal support tube (5) and threadedly connected to the diagonal support tube (5), an annular clamping block (26) fixed on the outside of the diagonal support tube (5), and an abutting ring (28) fixed on the end edge of the rotating threaded ring (27) and abutting against the annular clamping block (26), wherein the annular air film (23) is disposed between the annular clamping block (26) and the abutting ring (28).

6. The offshore wind power top-supported barrel foundation according to claim 5, characterized in that: The abutting surfaces of the annular clamping block (26) and the abutting ring (28) are inclined surfaces that fit each other. The outer side of the diagonal support tube (5) is also provided with two reinforcement components for respectively fixing the two ends of the annular air film (23). The reinforcement component comprises a fixing ring (24) movably sleeved on the outer side of the diagonal support tube (5) and a fixing bolt (25) bolted to the fixing ring (24) and one end of which passes through between the fixing ring (24) and the diagonal support tube (5). The insertion end of the fixing bolt (25) abuts against the annular air film (23). The outer side wall of the diagonal support tube (5) is also provided with two liquid placement annular grooves (29) close to the two ends of the annular air film (23), into which a colloid can be injected to bond the annular air film (23) to the diagonal support tube (5) to achieve sealing and fixing.

7. An offshore wind power top-supported barrel foundation according to claim 4 or 6, characterized in that: The first inflation mechanism comprises a first suction pipe (13) which passes through an outer end into the interior of the diagonal support tube (5) and is used to evacuate or deliver air to the expansion space, and a first control valve (16) fixed to the first suction pipe (13); the first suction pipe (13) passes through between two partitions (20); and a first pressure sensor (21) is fixed to the partition (20) for detecting the pressure in the expansion space.

8. An offshore wind power top-supported barrel foundation according to claim 3 or 6, characterized in that: The second inflation mechanism comprises a connecting tube (17) whose lower end is located in the arc-shaped airbag (8) and whose upper end penetrates and extends into the horizontal cylinder (6), a second suction tube (14) whose one end is connected to the upper end of the connecting tube (17) and whose other end sequentially penetrates the horizontal cylinder (6) and the diagonal support cylinder (5) and extends to the outside, and a second control valve (15) fixed to the second suction tube (14); a monitoring tube (18) whose top end penetrates and extends into the horizontal cylinder (6) is connected above the arc-shaped airbag (8); a second pressure sensor (19) for detecting the pressure in the arc-shaped airbag (8) is fixed at the upper end of the monitoring tube (18).

9. The offshore wind power top-supported barrel foundation according to claim 8, characterized in that: A plurality of fan-shaped compartments (30) are provided on the top cover of the cylinder (1), and the plurality of fan-shaped compartments (30) correspond to a plurality of side compartments respectively. A first extraction pipe (36) is provided above the fan-shaped compartment (30), the bottom end of which penetrates the fan-shaped compartment (30) and extends into the side compartment. A discharge pipe (38) is communicated with the outside of the fan-shaped compartment (30). A second extraction pipe (32) is provided in the fan-shaped compartment (30), the bottom end of which penetrates and extends into the side compartment. A first extraction control valve (37), a discharge control valve (39) and a second extraction control valve (33) are provided on the first extraction pipe (36), the discharge pipe (38) and the second extraction pipe (32), respectively. An exhaust pipe (34) and an air charging pipe (35) are provided on the fan-shaped compartment (30).

10. The offshore wind power top-supported barrel foundation according to claim 1, characterized in that: A second fixing groove (44) is formed at the upper end of the diagonal bracing tube (5), a second tie rod (45) is fixed in the second fixing groove (44), a plurality of first fixing grooves (40) are formed on the outer wall of the steel transition section (2), a first tie rod (41) is fixed in the first fixing groove (40), and a sling (46) is tied between the plurality of first tie rods (41) and the second tie rods (45) for fixing the diagonal bracing tube (5) before installation.

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