Settling and scour protection integrated structure of offshore wind power five-connected-cylinder jacket foundation and construction method of sinking and scour protection integrated structure

Abstract

The invention discloses an offshore wind power five-connected-cylinder jacket foundation sinking and scouring protection integrated structure and a construction method thereof. The integrated structure comprises a five-connected-cylinder foundation body and a protection structure. The protection structure comprises a protection table; the top and the bottom of the protection table are respectively provided with a protection inner surface and a protection outer surface; the protection inner surface is provided with a five-connection-cylinder main body; the contact position of the five-protection inner surface and the peripheral edge of the bottom of the five-connection-cylinder foundation is a protection inner edge; the outer side of the periphery of the protection table is a protection outer edge; an annular sand bag is arranged around the protective outer edge; a plurality of ground anchors are arranged around one side, far away from the protection inner edge, of the protection outer edge; a plurality of radial sand bags are arranged on the protective inner surface; the inner and outer ends of the radial sand bag are respectively connected with the protective inner edge and the protective outer edge; vertical hooks are arranged at the ends, facing the protective outer edge, of the radial sand bags. According to the method, potential safety hazards caused by local wave current scouring around the offshore wind power five-connected-cylinder foundation can be effectively eliminated, and normal operation of offshore wind power is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power engineering, and in particular to an integrated structure for foundation sinking and scour protection of an offshore wind power five-tube jacket and a construction method thereof. Background Art

[0002] Offshore wind power has the advantages of not occupying land area and abundant wind resources, and has become one of the important ways to convert and utilize renewable energy.

[0003] Due to the complex and changeable marine environment, the soil around the offshore wind power foundation used to support offshore wind power generation (i.e. installing wind power generation equipment, such as wind turbines) is easily disturbed by the foundation, and huge scour pits are easily generated under the combined action of waves and currents, especially in the strata where silty soft soil is widely distributed in China. Once the scour pit is formed, the foundation bearing capacity drops rapidly, which can easily cause deformation and failure of the supporting structure, resulting in accidents such as shutdown of offshore wind power equipment for maintenance or removal of offshore wind power foundations, which seriously affects the power generation efficiency.

[0004] The main forms of offshore wind power foundations currently include pile foundations and five-tube foundations. Unlike pile foundations with generally longer pile lengths, the impact of wave and current scouring on the in-situ safety of large-diameter, shallow-buried five-tube foundations is more severe, posing a greater safety hazard.

[0005] In addition, for pile foundations, the scour protection technical solutions currently in use all require re-construction after the foundation is sunk into place. In addition to the problems of long construction period and high cost, they often require multiple subsequent maintenance due to secondary scour problems, which results in high maintenance costs.

[0006] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Summary of the invention

[0007] The purpose of the present invention is to provide an integrated structure for foundation sinking and scour protection of an offshore wind power five-tube jacket and a construction method thereof in view of the technical defects existing in the prior art.

[0008] To this end, the present invention provides an integrated structure for sinking and scour protection of an offshore wind power five-tube jacket foundation, comprising: a five-tube foundation body, radial sand bags, annular sand bags and a protection structure;

[0009] Protective structures, set on the seabed;

[0010] The seabed, which lies just below the water surface;

[0011] protective structures, including protective platforms;

[0012] The top and bottom of the protection platform have a protection inner surface and a protection outer surface respectively;

[0013] A five-tube main body is provided at the center of the inner surface of the protection;

[0014] The bottom surface of the five-barrel foundation provided at the lower part of the five-barrel body is in contact with the protective inner surface;

[0015] The protective inner surface is in contact with the bottom edges of the five-linked tube foundation at the lower part of the five-linked tube body, and is a surrounding protective inner edge;

[0016] The outer sides of the protective platform are surrounded by protective outer edges;

[0017] Wherein, the protective outer edge is surrounded by an annular sand bag on the side facing the protective inner edge;

[0018] The side of the ring-shaped sandbag is connected to the inner surface of the protection;

[0019] Wherein, the outer edge of the protection is surrounded by a plurality of anchors distributed at intervals on a side away from the inner edge of the protection;

[0020] Wherein, a plurality of radial sand bags are arranged on the inner surface of the protection;

[0021] The inner and outer ends of the radial sandbag are connected to the protective inner edge and the protective outer edge respectively;

[0022] The side of the radial sandbag is connected to the inner surface of the protection;

[0023] A vertical hook is arranged at one end of the radial sand bag facing the outer edge of the protection.

[0024] In addition, the present invention also provides a construction method for the above-mentioned offshore wind power five-tube jacket foundation sinking and scour protection integrated structure, comprising the following steps:

[0025] Step S1, sewing;

[0026] The specific operation is as follows: a circumferential sand bag and a plurality of radial sand bags are sewn on the protective inner surface of the protective platform;

[0027] Step S2, filling with sand;

[0028] The specific operation is: sand flushing the inner space of the annular sandbags and radial sandbags sewn on the protective inner surface of the protective platform;

[0029] Step S3, tying;

[0030] The specific operation is as follows: a plurality of vertical hooks are made in advance at the land port, one end of the vertical hook is hung on the top ring beam of the five-link foundation at the lower part of the pre-fabricated five-link body, and the other end of the vertical hook is fixedly connected to the end of the radial sandbag facing the outer edge of the protection;

[0031] Step S4, laminating;

[0032] The specific operation is: through multiple vertical hooks, the protective platform of the protective structure completely wraps the surrounding side walls and bottom of the five-linked barrel foundation at the lower part of the five-linked barrel body, ensuring that the radial sandbags remain vertically distributed and fit on the surrounding side wall surfaces of the five-linked barrel foundation;

[0033] Step S5, floating;

[0034] The specific operation is: float the protective structure along with the five-barrel main body to the target installation site;

[0035] Step S6, sinking;

[0036] The specific operation is as follows: lower the five-tube main body and the protective structure thereon to the water surface together, then apply ballast to the top of the five-tube main body, so that the five-tube foundation at the bottom of the five-tube main body sinks, and then perform negative pressure pumping operation on the five-tube foundation, so that the cylinder of the five-tube foundation gradually sinks under the action of the internal and external pressure difference, and then the protective outer surface of the protective platform contacts the surface of the seabed, and as the cylinder of the five-tube foundation of the five-tube main body continues to sink, the vertical hook on the protective structure keeps moving vertically upward and begins to separate from the top ring beam of the five-tube foundation;

[0037] Step S7, blooming;

[0038] The specific operation is as follows: under the eccentric weight of the radial sandbags, the protective platform of the protective structure begins to bloom, and the anchors installed on the protective outer edge of the protective platform are driven downward into the seabed under the weight of the radial sandbags, annular sandbags and the anchors themselves;

[0039] Step S8, completing the construction;

[0040] The specific operation is: when the protective platform of the protective structure is completed and naturally adheres to the surface of the seabed, the inside of the five-barrel foundation at the bottom of the five-barrel body is continuously pumped outward until the five-barrel foundation at the bottom of the five-barrel body is completely sunk, thus completing the construction operation.

[0041] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides an integrated structure for sinking and scour protection of an offshore wind power five-tube jacket foundation and a construction method thereof, which is scientifically designed and can effectively eliminate the safety hazards caused by local wave and current scour around the offshore wind power five-tube foundation, ensure the normal operation of the offshore wind power foundation and the wind power generation equipment thereon, and has great practical significance.

[0042] The integrated structure for foundation sinking and scour protection of the offshore wind power five-tube jacket of the present invention has a scientific and reasonable overall structure and low cost. During the construction process, it can avoid renting lifting equipment and transport ships, and the construction period is short. It can effectively eliminate the hidden dangers of local scour caused by wave currents and solve the problem of secondary scour and multiple maintenance of traditional protective foundations.

[0043] By applying the technical solution of the present invention, the integrated construction of scour protection as the barrel foundation is sunk into place is realized, avoiding the additional rental of lifting equipment and transport ships, greatly reducing construction costs and improving construction efficiency. Under the protection of the integrated structure of sinking and scour protection provided by the present invention, scour pits can hardly be formed around the five-barrel foundation. The manufacturing cost is low, the construction efficiency is high, the local scour protection effect is good, and the flexible protection structure can naturally fit the bed surface to avoid the risk of secondary scour. It has extremely strong market value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1a A top view of the offshore wind power five-tube jacket foundation sinking and scour protection integrated structure provided by the present invention after the sand filling operation is completed during the construction operation;

[0045] Figure 1b A schematic diagram of the front structure of the integrated structure for foundation sinking and scour protection of a five-tube jacket for offshore wind power provided by the present invention after the sand filling operation is completed during the construction operation;

[0046] Figure 2 It is a schematic diagram of the offshore wind power five-tube jacket foundation sinking and scour protection integrated structure provided by the present invention after the bonding is completed during the construction operation;

[0047] Figure 3 It is a schematic diagram of the offshore wind power five-tube jacket foundation sinking and scour protection integrated structure provided by the present invention after sinking in water during construction operation;

[0048] Figure 4 It is a schematic diagram of the offshore wind power five-tube jacket foundation sinking and scour protection integrated structure provided by the present invention when the construction operation is in progress and the structure is beginning to bloom;

[0049] Figure 5 It is a schematic diagram of the integrated structure for foundation sinking and scour protection of the offshore wind power five-tube jacket provided by the present invention during the construction operation when the opening is completed; that is, a schematic diagram of the integrated structure for foundation sinking and scour protection of the offshore wind power five-tube jacket provided by the present invention after the overall construction is completed;

[0050] Figure 6 It is a schematic diagram of the scour protection effect of the offshore wind power five-tube jacket foundation sinking and scour protection integrated structure provided by the present invention after the construction operation is completed;

[0051] In the figure, 1, the main body of the five-tube; 10, the foundation of the five-tube; 11, the top cover ring beam; 12, the conductor frame;

[0052] 2. Protective structure; 20. Protective platform;

[0053] 21. Protect inner surface; 22. Protect outer surface; 23. Protect inner edge; 24. Protect outer edge; 25. Radial sandbag; 26. Circumferential sandbag;

[0054] 211, vertical hook; 221, anchor nail; 251, outer warehouse; 252, inner warehouse;

[0055] 3. Seabed; 4. Water surface. DETAILED DESCRIPTION

[0056] 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.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] See also Figure 1a , Figure 1b as well as Figures 2 to 6 The present invention provides an integrated structure for sinking and scour protection of an offshore wind power five-tube jacket foundation, comprising: a five-tube foundation body 1, radial sand bags 25, annular sand bags 26 and a protection structure 2;

[0061] a protective structure 2 disposed on a seabed 3;

[0062] a seabed 3 located below the water surface 4;

[0063] A protective structure 2, comprising a protective platform 20;

[0064] The top and bottom of the protection platform 20 respectively have a protection inner surface 21 and a protection outer surface 22 (i.e., the upper and lower sides of the protection platform 20 in a flat state);

[0065] It should be noted that the protective inner surface 21 of the protective platform 20 is the top surface of the protective platform 20 when it is laid flat; and the protective outer surface 22 of the protective platform 20 is the bottom surface of the protective platform 20 when it is laid flat.

[0066] A five-tube main body 1 is provided at the center of the protective inner surface 21 (the five-tube main body is an existing offshore wind power foundation structure for installing wind power generation equipment);

[0067] The bottom surface of the five-barrel foundation 10 provided at the lower part of the five-barrel body 1 is in contact with the protective inner surface 21;

[0068] The protective inner surface 21 (i.e., the top surface of the protective platform 20) contacts the bottom edges of the five-linked barrel base 10 at the lower part of the five-linked barrel body 1, and is a surrounding protective inner edge 23;

[0069] The outer sides of the protective platform 20 are surrounded by protective outer edges 24;

[0070] The protective outer edge 24 is surrounded by an annular sand bag 26 on the side facing the protective inner edge 23 (i.e., the inner side);

[0071] The side surface of the annular sand bag 26 is connected (e.g., sewn) to the protective inner surface 21 (i.e., the top surface of the protective platform 20);

[0072] It should be noted that, for the present invention, the annular sandbags 26 are arranged annularly on one side of the protective outer edge 24 of the protective structure 2 toward the protective inner edge 23, so as to ensure the stability of the ballast when the protective structure 2 is attached to the seabed surface after the blooming operation during the construction process is completed.

[0073] The protective outer edge 24 is provided with a plurality of anchors 221 distributed at intervals around the protective outer edge 24 on a side away from the protective inner edge 23 (i.e., in the outer direction);

[0074] Wherein, a plurality of radial sand bags 25 are arranged (e.g., sewn) on the protective inner surface 21 (i.e., the top surface of the protective platform 20);

[0075] The inner and outer ends of the radial sandbag 25 are connected to the protective inner edge 23 and the protective outer edge 24 respectively;

[0076] The side surface of the radial sandbag 25 is connected (e.g., sewn) to the protective inner surface 21 (i.e., the top surface of the protective platform 20);

[0077] A vertical hook 211 is provided at one end of the radial sand bag 25 facing the protective outer edge 24 .

[0078] It should be noted that, for the present invention, the five-tube foundation 10 provided at the lower part of the five-tube main body 1 is a tube with an open bottom (specifically, the bottom is not sealed and is completely open);

[0079] In the present invention, in a specific implementation, the protective structure 2 includes a protective platform 20, which is specifically a geotextile.

[0080] In the present invention, in a specific implementation, the overall shape of the annular sand bag 26 is a hollow torus.

[0081] In the present invention, in a specific implementation, the overall shape of the radial sand bag 25 is a hollow cylinder.

[0082] It should be noted that the materials of the protection platform 20, the annular sandbags 26 and the radial sandbags 25 are all geotextiles. Geotextiles are a synthetic material used in civil engineering, mainly composed of raw materials such as high molecular polymers and inorganic fibers, with low cost and easy weaving.

[0083] Among them, the protective platform 20 is made of geotextile, which has the following effects:

[0084] First, it acts as an effective filter layer, allowing water to pass through but preventing the migration of soil particles, and its flexible characteristics can naturally conform to the surface of the seabed. Second, it can increase the stability of the foundation, especially when it is laid on a weak foundation, it can reduce the risk of foundation settlement and deformation by dispersing the load applied to it, thereby protecting the soil below from erosion.

[0085] Among them, the annular sandbags and the longitudinal sandbags are both sandbags formed by wrapping geotextiles with sand. Their main function is to ballast the protection platform 20 to prevent the protection platform 20 from being carried away by the water flow in a strong current environment, so that the protection platform 20 can be firmly and naturally attached to the seabed surface for scour protection.

[0086] In the present invention, in a specific implementation, the interior of the radial sand bag 25 includes two hollow chambers, an inner chamber 252 and an outer chamber 251;

[0087] The inner bin 252 is close to the protective inner surface 21 of the protective platform 20 (i.e., the top surface of the protective platform 20 when it is laid flat);

[0088] The outer compartment 251 is away from the protective inner surface 21 of the protective platform 20 .

[0089] It should be noted that, for the present invention, the radial sand bags 25 are separated at b / 2, where b is the width of the radial sand bags 25 (not the radial length of the radial sand bags 25). For the radial sand bags 25 arranged on the protective inner surface 21 (i.e., the top surface of the protective platform 20 in a flat state), the compartment close to the protective inner surface 21 of the protective structure 2 is the inner compartment 252, and the compartment away from the protective inner surface 21 of the protective platform 20 is the outer compartment 251.

[0090] In specific implementation, the volumes of the inner compartment 252 and the outer compartment 251 of the radial sandbag 25 are equal;

[0091] The inner chamber 252 and the outer chamber 251 of the radial sand bag 25 are both filled with sand and gravel;

[0092] The density of sand and gravel in the inner bin 252 is lower than the density of sand and gravel in the outer bin 251 .

[0093] It should be noted that the inner chamber 252 of the radial sand bag 25 is filled with light-density sand, and the outer chamber of the radial sand bag is filled with heavy-density sand.

[0094] In the present invention, in a specific implementation, the annular sand bag 26 is filled with sand and gravel;

[0095] The density of sand and gravel in the annular sand bag 26 is lower than the density of sand and gravel in the outer compartment 251 of the radial sand bag 25 .

[0096] In a specific implementation, the density of the sand and gravel in the annular sand bag 26 is equal to the density of the sand and gravel in the inner compartment 252 of the radial sand bag 25 .

[0097] It should be noted that, for the present invention, the reason why the inner bin 252 of the radial sand bag 25 is required to be filled with light-density sand and the outer bin of the radial sand bag is filled with heavy-density sand is that this requirement can make the outer bin heavier and the inner bin lighter. When the cylinder (i.e., the five-link cylinder main body 1) sinks and touches the seabed, the vertical hook 211 is disengaged, and automatic opening can be achieved without providing any auxiliary lifting equipment for coordinated operation.

[0098] It should be noted that, for the present invention, the reason why the density of sand and gravel in the annular sand bag 26 is required to be lower than the density of sand and gravel in the outer chamber 251 of the radial sand bag 25 is that such a requirement is set to help avoid the disturbance of the radial sand bag 25 by the annular sand bag 26 during the floating process, and to ensure that the weight of the annular sand bag 26 will not interfere with the automatic opening of the radial sand bag 25 during the sinking installation process.

[0099] In practice, the density of the light density sand is generally less than 2500 kg / m 3 The density of the heavy density sand is generally greater than 2700kg / m 3 .

[0100] In the present invention, in a specific implementation, the vertical hook 211 is used to connect (i.e., hang) with the top cover ring beam 11 of the five-link foundation 10 at the lower part of the five-link body 1, so that the protective inner surface 21 of the protective platform 20 is in contact with the side walls around the five-link foundation 10 at the lower part of the five-link body 1, so that the protective platform 20 wraps around the five-link foundation 10 at the lower part of the five-link body 11.

[0101] The top cover ring beam 11 is arranged around the edges of the top cover on the top of the five-tube foundation 10 .

[0102] Therefore, in the present invention, when the five-tube main body 1 is floated to the target installation site (i.e., the seabed location to be installed), the protective platform 20 can wrap the five-tube foundation 10 at the bottom of the five-tube main body 1 to facilitate the floating operation. At this time, the integrated structure of the present invention has not yet been installed.

[0103] It should be noted that one end of the vertical hook 211 can be connected (ie, hung) to the top cover ring beam 11 of the five-link foundation 1 at the lower part of the five-link body 1 , and the other end is connected to one end of the radial sandbag 25 .

[0104] It should be noted that, for the integrated structure of the present invention, during the sinking process, the protective structure 2 tightly surrounds the five-tube foundation 10 at the bottom of the five-tube body 1 through the vertical hook 211 to reduce the lateral movement under dynamic water conditions and avoid affecting the negative pressure sinking installation process of the five-tube foundation 10 at the bottom of the five-tube body 1. The vertical hook 211 ensures that the radial sandbags 25 on the protective structure 2 can only be separated from the top cover ring beam 11 on the five-tube foundation 10 in the vertical direction, avoiding unhooking due to the horizontal force of shock in a dynamic water environment (i.e., avoiding the radial sandbags 25 from being separated from the five-tube foundation 10 at the bottom of the five-tube body 1).

[0105] For the integrated structure of the present invention, during its blooming (i.e., unfolding in the surrounding outer directions), the vertical hook 211 vertically detaches from the top cover ring beam 11 on the five-tube foundation 10, and the radial sandbags 25 gradually bloom (i.e., unfold in the surrounding outer directions) around the protective inner edge 23 of the protective structure 2 under the eccentric weight of the outer bin 251 and the inner bin 252. After the blooming of the protective structure 2 is completed, the multiple anchors 221 on the protective outer edge 24 of the protective structure 2 are driven into the seabed to play a role in reliable positioning. At this time, the radial sandbags 25, the annular sandbags 26 and the protective structure 2 are placed flat on the seabed surface 3, or fit the irregular bed surface terrain.

[0106] In the present invention, in a specific implementation, the protective structure 2 includes a protective platform 20, which is a flexible geotextile or a plastic film;

[0107] The shape of the protection platform 20 included in the protection structure 2 is round or square.

[0108] In a specific implementation, when the overall shape of the protection platform 20 is a flat circle, the radial sand bags 25 are radially distributed; further, at this time, the angles between any two adjacent radial sand bags 25 are equal.

[0109] In the present invention, in order to obtain the above-mentioned offshore wind power five-tube jacket foundation sinking and scour protection integrated structure provided by the present invention, see Figure 1a , Figure 1b as well as Figures 2 to 6 The present invention also provides a construction method for an integrated structure of foundation sinking and scour protection of an offshore wind power five-tube jacket, which specifically includes the following steps:

[0110] Step S1, sewing;

[0111] The specific operation is as follows: at the land port, a protective platform 20 of the protective structure 2 is formed by sewing the geotextile, and an annular sand bag 26 and a plurality of radial sand bags 25 are sewn on the protective inner surface 21 of the protective platform 20;

[0112] In step S1, a sand flushing space (i.e., a cavity for loading sand and gravel) is reserved in advance in the annular sand bag 26 and the radial sand bag 25, including the length h and width b required for the sand flushing space.

[0113] Step S2, filling with sand;

[0114] See also Figure 1a , Figure 1b As shown, the specific operation is: sand flushing operation (i.e. filling sand and gravel) is performed on the inner space of the annular sand bag 26 and the radial sand bag 25 sewn on the protective inner surface 21 of the protective platform 20;

[0115] In step S2 , the density of sand and gravel in the annular sand bag 26 is lower than the density of sand and gravel in the outer compartment 251 of the radial sand bag 25 .

[0116] The density of sand and gravel in the inner compartment 252 of the radial sand bag 25 is lower than the density of sand and gravel in the outer compartment 251 .

[0117] It should be noted that the inner compartments 252 of the annular sandbags 26 and the radial sandbags 25 are filled with light-density sand, and the outer compartments 251 of the radial sandbags 25 are filled with heavy-density sand.

[0118] Step S3, tying;

[0119] The specific operation is as follows: a plurality of vertical hooks 211 are made in advance at the land port, one end of the vertical hook 211 is hung on the top ring beam 11 of the five-linked barrel foundation 10 at the lower part of the pre-fabricated five-linked barrel body 1, and the other end of the vertical hook 211 is fixedly connected to one end of the radial sandbag 25 facing the protective outer edge 24;

[0120] Step S4, laminating;

[0121] See also Figure 2 As shown, the specific operation is: through multiple vertical hooks 211, the protective platform 20 of the protective structure 2 completely wraps the surrounding side walls and the bottom of the five-linked barrel foundation 10 at the lower part of the five-linked barrel body 1, ensuring that the radial sandbags 25 remain vertically distributed and fit on the surrounding side wall surfaces of the five-linked barrel foundation 10;

[0122] Step S5, floating;

[0123] The specific operation is: float the protective structure 2 along with the five-tube main body 1 to the target installation site (i.e. the seabed 3 to be installed);

[0124] It should be noted that after the protective structure 2 is floated to the target installation site along with the five-tube main body 1 , the protective structure 2 begins to follow the five-tube main body 1 to continue the negative pressure sinking and integrated installation operations.

[0125] It should be noted that, by using an existing floating ship and a tugboat for pulling the floating ship, the protective structure 2 and the five-tube main body 1 can be placed on the floating ship, and the protective structure 2 and the five-tube main body 1 can be floated together.

[0126] Step S6, sinking;

[0127] The specific operation is: see Figure 3As shown, the five-tube main body 1 and the protective structure 2 thereon are lowered to the water surface 4 together, and then ballast is applied to the top of the five-tube main body 1, so that the five-tube foundation 10 provided at the lower part of the five-tube main body 1 sinks, and then the five-tube foundation 10 (hollow cylinder structure) is subjected to negative pressure pumping operation, so that the cylinder of the five-tube foundation 10 gradually sinks under the action of the internal and external pressure difference (at this time, seawater flows in through the gap between the protective platform 20 and the side walls around the five-tube foundation 10, and then enters the cylinder inner cavity of the five-tube foundation 10 through the gap between the bottom opening of the five-tube foundation 10 and the top surface of the protective platform 20), so that the protective outer surface 22 of the protective platform 20 contacts the surface of the seabed 3, and as the cylinder of the five-tube foundation 10 of the five-tube main body 1 continues to sink, the vertical hook 211 on the protective structure keeps moving vertically upward and begins to separate from the top ring beam 11 of the five-tube foundation 10;

[0128] It should be noted that, according to the suction cylinder principle, the five-tube foundation 10 (hollow tube structure) is subjected to negative pressure pumping, so that the five-tube foundation 10 and the catheter frame 12 arranged on the top of the five-tube foundation 10 continue to sink under the action of the internal and external pressure difference.

[0129] It should be noted that, for the present invention, during the sinking process of the five-tube foundation 10, there will inevitably be a bottoming stage (i.e., the stage in which the protective outer surface 22 of the protective platform 20 located directly below the cylinder of the five-tube foundation 10 begins to contact the seabed surface), and a stage in which the bottom of the cylinder touches the seabed surface (i.e., the stage in which the protective outer surface 22 of the protective platform 20 located directly below the cylinder of the five-tube foundation 10 completely contacts the seabed surface and the five-tube foundation 10 stops sinking). The role of the protective structure 2 being attached to the surface of the five-tube foundation 10 through the vertical hook 211 is that before the cylinder of the five-tube foundation 10 and the protective outer surface 22 of the protective platform 20 directly below the cylinder touch the bottom, it cannot be disengaged through the degrees of freedom in other directions, and can only be disengaged vertically upward. When touching the bottom, the cylinder of the five-cylinder foundation 10 will continue to sink under a continuous negative pressure state, and the protective structure attached to the surface of the cylinder (specifically, the protective platform 20 directly below the cylinder) will slide upward accordingly (because the cylinder of the five-cylinder foundation 10 presses down the protective platform 20, causing the protective platform 20 to retract upward and inward), causing the vertical hooks 211 set on the radial sand bags 25 fixed in the protective inner surface 21 of the protective platform 20 to move vertically upward and begin to detach from the top ring beam 11 of the five-cylinder foundation 10, gradually achieving vertical unhooking.

[0130] It should be noted that, for the integrated structure of the present invention, during the sinking process, the protective structure 2 tightly surrounds the five-tube foundation 10 at the bottom of the five-tube body 1 through the vertical hook 211 to reduce the lateral movement under dynamic water conditions and avoid affecting the negative pressure sinking installation process of the five-tube foundation 10 at the bottom of the five-tube body 1. The vertical hook 211 ensures that the radial sandbags 25 on the protective structure 2 can only be separated from the top cover ring beam 11 on the five-tube foundation 10 in the vertical direction, avoiding unhooking due to the horizontal force of shock in a dynamic water environment (i.e., avoiding the radial sandbags 25 from being separated from the five-tube foundation 10 at the bottom of the five-tube body 1).

[0131] It should be noted that the five-tube main body 1 and the protective structure 2 thereon can be lifted and lowered together by means of a lifting device (such as a small crane) on a floating vessel.

[0132] Step S7, blooming (i.e., spreading outwards in all directions);

[0133] See also Figure 4 As shown, the specific operation is as follows: under the eccentric weight of the radial sandbag 25, the protection platform 20 of the protection structure 2 begins to bloom (i.e., expands outward in all directions), and the anchors 221 installed on the protection outer edge 24 of the protection platform 20 are driven downward into the seabed 3 under the weight of the radial sandbag 25, the annular sandbag 26 and the anchors themselves;

[0134] It should be noted that, for the integrated structure of the present invention, during the blooming process, the vertical hook 211 vertically detaches from the top cover ring beam 11 on the five-tube foundation 10, and the radial sandbag 25 gradually blooms around the protective inner edge 23 of the protective structure 2 (i.e., expands in the surrounding outer direction) under the eccentric weight of the outer bin 251 and the inner bin 252. After the blooming of the protective structure 2 is completed, the multiple anchors 221 on the protective outer edge 24 of the protective structure 2 are driven into the seabed to play a role in reliable positioning. At this time, the radial sandbag 25, the annular sandbag 26 and the protective structure 2 are placed flat on the seabed surface 3, or fit the irregular bed surface terrain.

[0135] In specific implementation, for the integrated structure of the present invention, during the blooming process, the mass m of the anchor 221 is 1 , the length l of the anchor 221, the speed V of the anchor 221 (i.e., the expansion in the surrounding outer directions) 1 , the mass of radial sandbag 25 m 2 , the length h of the radial sandbag 25, the width b of the radial sandbag 25 1 The radial sandbag 25 expands (ie expands to the surrounding outer directions) at a speed V 2 , the mass of the annular sandbag 26 m 3, the width of the annular sandbag 26 (i.e. the length in the radial direction, not the circumferential length) b 2 , the opening speed V of the annular sandbag 26 (i.e., the opening speed V of the annular sandbag 26) is 3 , the falling time of the annular sandbag 26 is t, and according to the energy conservation theorem, it conforms to the following formula:

[0136] m 1 g(hl / 2)+m 2 g(h / 2-b 1 / 2)+m 3 g(hb 2 / 2)=1 / 2m 1 V 1 2 +1 / 2m 2 V 2 2 +1 / 2m 3 V 3 2 , formula (1);

[0138] Assumption b 1 =b 2 =l=b,m 1 =1 / 8m 2 =1 / 8m 3 , V 1 =V 3 =2V 2 , then the acceleration a of the anchor 221 inserted into the seabed 3 conforms to the following formula (2), and then the force F of the anchor 221 inserted into the seabed 3 is obtained;

[0139]

[0140] In formula (2), a is the acceleration of the anchor 221 inserted into the seabed 3;

[0141] h is the length of the radial sand bag 25;

[0142] t is the falling process time of the annular sandbag 26 (i.e. the time required from the beginning of falling to contacting the seabed 3);

[0143] b is the width b of the radial sandbag 25 1 ; Width b of radial sandbag 25 1 Equal to the width of the annular sandbag 26 (i.e. the length in the radial direction, not the circumferential length) b 2 , which is also equal to the length l of the anchor 221.

[0144] In specific implementation, the length h of the radial sandbag 25 is H / 2~H, where H is the height of each cylinder of the five-cylinder foundation 10 (i.e., five-cylinder), which should be determined according to the scour protection range and actual terrain. 1 and b 2 The specific details should be determined based on the scour protection range and actual terrain.

[0145] In step S7, in specific implementation, the force F of the anchor 221 inserted into the seabed 3 conforms to the following calculation formula:

[0146] F=m 1× a, formula (3);

[0147] Among them, m 1 is the mass of the anchor 221;

[0148] a is the acceleration of the anchor 221 inserted into the seabed 3.

[0149] It should be noted that, as described above, for the present invention, the calculation of the acceleration a of the anchor has taken into account the weight of the radial sandbag, the annular sandbag and the anchor.

[0150] For the present invention, the reason why it is required to calculate and obtain the force F of the anchor 221 inserted into the seabed 3 is to ensure the stability and safety of the anchor inserted into the seabed. First, it ensures that the structure can remain stable when facing waves, currents, wind and other natural forces. By calculating the force F of the anchor 221 inserted into the seabed 3, it can be evaluated whether the anchoring system can withstand the expected external force without moving or tilting. Second, it helps engineers in the field to select the appropriate anchor type, size and quantity to meet the needs of specific projects. Different seabed geological conditions (such as sandy, muddy or rocky bottoms) require different types of anchoring solutions. Third, the reasonable calculation of the required insertion force F can help reduce unnecessary material waste while ensuring sufficient safety and maximizing cost-effectiveness.

[0151] Step S8, completing the construction;

[0152] See also Figure 5 As shown, the specific operation is: when the protective platform 20 of the protective structure 2 has completed its blooming (i.e., it no longer unfolds outward, for example, it has been spread out), it naturally adheres to the surface of the seabed 3, and the inside of the five-barrel foundation 10 at the lower part of the five-barrel main body 1 continues to be pumped outward (for example, through a water pump and a through hole reserved at the top of the five-barrel foundation 10, which can be sealed by a sealing cover) until the five-barrel foundation 10 at the lower part of the five-barrel main body 1 is completely sunk (i.e., it no longer continues to sink), and the construction operation is completed.

[0153] It should be noted that, for the present invention, the five-barrel foundation 10 provided at the lower part of the five-barrel main body 1 is a cylinder with an opening at the bottom (specifically, the bottom is not sealed and is completely open); since the five-barrel foundation 10 is a cylindrical structure with an opening at the bottom and a closed top, the moment the cylinder enters the water, the water (i.e., the seawater outside) enters the interior of the cylinder from the bottom opening of the five-barrel foundation 10.

[0154] In order to further demonstrate the protective effect of the integrated structure for sinking and scour protection of the offshore wind power five-tube jacket provided by the present invention, the scour morphology of the bed surface under the protective structure provided by the present invention is captured and inverted, such as Figure 6 As shown, the results show that: under the protection of the structure provided by the present invention, it is almost impossible to generate scour pits around the five-tube foundation 10, which can ensure that the five-tube foundation 10 with a large diameter and shallow burial depth is protected from scour attacks, thereby ensuring the safety of the foundation in place.

[0155] It should be noted that Figure 6 The terrain change effect map is obtained by using 3D structured light camera equipment to scan the results of the 1:100 scale indoor scour model test, and then using point cloud reconstruction technology to obtain the terrain change effect map. Figure 6 In the figure, the horizontal and vertical axes represent the length scales of the scanning range, which can be defined as the length in the downstream direction and the length perpendicular to the downstream direction, respectively. Figure 6 In the figure, the square frame lines are the outer edges of the protective structure.

[0156] Figure 6 This reflects that the protection scheme provided by the present invention has a good scour protection effect. Figure 6 It can be seen from the figure that: in the area around the five-barrel foundation, the scouring depth is relatively small, close to 0mm, and in the area around the protective structure, the scouring depth is the largest, close to 40mm. This shows that: the present invention can actively transfer the scouring phenomenon around the five-barrel foundation to the external area far away from the area around the five-barrel foundation, thereby greatly avoiding the scouring phenomenon around the five-barrel foundation.

[0157] In summary, compared with the prior art, the present invention provides an integrated structure for sinking and scour protection of an offshore wind power five-tube jacket foundation and a construction method thereof. The structure is scientifically designed and can effectively eliminate the potential safety hazards caused by local wave and current scour around the offshore wind power five-tube foundation, thereby ensuring the normal operation of the offshore wind power foundation and the wind power generation equipment thereon, and has great practical significance.

[0158] The integrated structure for foundation sinking and scour protection of the offshore wind power five-tube jacket of the present invention has a scientific and reasonable overall structure and low cost. During the construction process, it can avoid renting lifting equipment and transport ships, and the construction period is short. It can effectively eliminate the hidden dangers of local scour caused by wave currents and solve the problem of secondary scour and multiple maintenance of traditional protective foundations.

[0159] By applying the technical solution of the present invention, the integrated construction of scour protection as the barrel foundation is sunk into place is realized, avoiding the additional rental of lifting equipment and transport ships, greatly reducing construction costs and improving construction efficiency. Under the protection of the integrated structure of sinking and scour protection provided by the present invention, scour pits can hardly be formed around the five-barrel foundation. The manufacturing cost is low, the construction efficiency is high, the local scour protection effect is good, and the flexible protection structure can naturally fit the bed surface to avoid the risk of secondary scour. It has extremely strong market value and application prospects.

[0160] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An integrated structure for foundation sinking and scour protection of an offshore wind power five-tube jacket, characterized in that: include: A five-tube foundation body (1), radial sand bags (25), annular sand bags (26) and a protective structure (2); A protective structure (2) is arranged on the seabed (3); The seabed (3), located below the water surface (4); A protective structure (2), comprising a protective platform (20); The top and bottom of the protection platform (20) respectively have a protection inner surface (21) and a protection outer surface (22); A five-tube main body (1) is arranged at the center of the protective inner surface (21); The bottom surface of the five-linked barrel base (10) provided at the lower part of the five-linked barrel main body (1) is in contact with the protective inner surface (21); The protective inner surface (21) contacts the bottom edges of the five-tube foundation (10) at the lower part of the five-tube main body (1), and is a surrounding protective inner edge (23); The outer sides of the protective platform (20) are surrounded by protective outer edges (24); Wherein, the protective outer edge (24) is surrounded by an annular sand bag (26) on the side facing the protective inner edge (23); The side surface of the annular sand bag (26) is connected to the protective inner surface (21); Wherein, the protective outer edge (24) is provided with a plurality of anchor nails (221) distributed at intervals around the side away from the protective inner edge (23); Wherein, a plurality of radial sand bags (25) are arranged on the protective inner surface (21); The inner and outer ends of the radial sandbag (25) are connected to the protective inner edge (23) and the protective outer edge (24) respectively; The side surface of the radial sandbag (25) is connected to the protective inner surface (21); A vertical hook (211) is provided at one end of the radial sand bag (25) facing the protective outer edge (24).

2. The offshore wind power five-tube jacket foundation sinking and scour protection integrated structure according to claim 1 is characterized in that: The overall shape of the annular sand bag (26) is a hollow torus; The overall shape of the radial sand bag (25) is a hollow cylinder.

3. The offshore wind power five-tube jacket foundation sinking and scour protection integrated structure according to claim 1 is characterized in that: The radial sand bag (25) includes two hollow chambers, an inner chamber (252) and an outer chamber (251); Wherein, the inner bin (252) is close to the protective inner surface (21) of the protective platform (20); The outer bin (251) is away from the protective inner surface (21) of the protective platform (20); The volumes of the inner compartment (252) and the outer compartment (251) of the radial sand bag (25) are equal; The inner chamber (252) and the outer chamber (251) of the radial sand bag (25) are both filled with sand and gravel; The density of the sand and gravel in the inner bin (252) is lower than the density of the sand and gravel in the outer bin (251).

4. The offshore wind power five-tube jacket foundation sinking and scour protection integrated structure according to claim 1 is characterized in that: Filling the annular sand bag (26) with sand and gravel; The density of sand and gravel in the annular sand bag (26) is lower than the density of sand and gravel in the outer compartment (251) of the radial sand bag (25).

5. The offshore wind power five-tube jacket foundation sinking and scour protection integrated structure according to claim 1 is characterized in that: The vertical hook (211) is used to connect with the top cover ring beam (11) of the five-tube foundation (10) at the bottom of the five-tube body (1), so that the protective inner surface (21) of the protective platform (20) is in contact with the surrounding side walls of the five-tube foundation (10) at the bottom of the five-tube body (1), that is, the protective platform (20) wraps around the five-tube foundation (10) at the bottom of the five-tube body (11); The top cover ring beam (11) is arranged around the edges of the top cover on the top of the five-tube foundation (10).

6. The offshore wind power five-tube jacket foundation sinking and scour protection integrated structure according to claim 1, characterized in that: The protective structure (2) includes a protective platform (20) which is a flexible geotextile or a plastic film; The shape of the protection platform (20) included in the protection structure (2) is round or square.

7. The offshore wind power five-tube jacket foundation sinking and scour protection integrated structure according to claim 6, characterized in that: When the overall shape of the protection platform (20) is a flat circle, the radial sand bags (25) are radially distributed, and at this time, the angles between any two adjacent radial sand bags (25) are equal.

8. A construction method for an integrated structure of foundation sinking and scour protection for an offshore wind power five-tube jacket as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, sewing; The specific operation is as follows: a circumferential sand bag (26) and a plurality of radial sand bags (25) are sewn on the protective inner surface (21) of the protective platform (20); Step S2, filling with sand; The specific operation is: sand flushing the inner space of the annular sand bag (26) and the radial sand bag (25) sewn on the protective inner surface (21) of the protective platform (20); Step S3, tying; The specific operation is as follows: a plurality of vertical hooks (211) are manufactured in advance at the land port, one end of the vertical hook (211) is hung on the top ring beam (11) of the five-tube foundation (10) at the lower part of the pre-manufactured five-tube body (1), and the other end of the vertical hook (211) is fixedly connected to one end of the radial sandbag (25) facing the protective outer edge (24); Step S4, laminating; The specific operation is as follows: through a plurality of vertical hooks (211), the protective platform (20) of the protective structure (2) completely wraps the surrounding side walls and the bottom of the five-tube foundation (10) at the lower part of the five-tube body (1), ensuring that the radial sandbags (25) remain vertically distributed and fit on the surrounding side wall surfaces of the five-tube foundation (10); Step S5, floating; The specific operation is as follows: the protective structure (2) is floated together with the five-tube main body (1) to the target installation site; Step S6, sinking; The specific operation is as follows: lowering the five-tube main body (1) and the protective structure (2) thereon to the water surface (4), then applying ballast to the top of the five-tube main body (1) so that the five-tube foundation (10) at the bottom of the five-tube main body (1) sinks, and then pumping negative pressure on the five-tube foundation (10) so that the cylinder of the five-tube foundation (10) gradually sinks under the action of the internal and external pressure difference, thereby making the protective outer surface (22) of the protective platform (20) contact the surface of the seabed (3), and as the cylinder of the five-tube foundation (10) of the five-tube main body (1) continues to sink, the vertical hook (211) on the protective structure keeps moving vertically upward and begins to separate from the top ring beam (11) of the five-tube foundation (10); Step S7, blooming; The specific operation is as follows: under the eccentric weight of the radial sandbag (25), the protection platform (20) of the protection structure (2) begins to bloom, and the anchor (221) installed on the protection outer edge (24) of the protection platform (20) is driven downward into the seabed (3) under the weight of the radial sandbag (25), the annular sandbag (26) and the anchor itself; Step S8, completing the construction; The specific operation is as follows: when the protective platform (20) of the protective structure (2) is fully opened and naturally adheres to the surface of the seabed (3), the inside of the five-tube foundation (10) at the bottom of the five-tube body (1) is continuously pumped outward until the five-tube foundation (10) at the bottom of the five-tube body (1) is completely sunk, thus completing the construction operation.

9. The construction method according to claim 8, characterized in that: In step S1, at a land port, a protection platform (20) of a protection structure (2) is formed by sewing a geotextile; In step S2, the density of sand and gravel in the annular sand bag (26) is lower than the density of sand and gravel in the outer compartment (251) of the radial sand bag (25). The density of sand and gravel in the inner compartment (252) of the radial sand bag (25) is lower than the density of sand and gravel in the outer compartment (251).

10. The construction method according to claim 8, characterized in that: In step S7, the force F of the anchor (221) inserted into the seabed (3) is calculated according to the following formula: F=m 1× a, formula (3); Wherein, m1 is the mass of the anchor (221); a is the acceleration of the anchor (221) being inserted into the seabed (3); The acceleration a of the anchor (221) inserted into the seabed (3) conforms to the following formula (2): In formula (2), h is the length of the radial sand bag (25); t is the falling process time of the annular sand bag (26); b is the width b1 of the radial sand bag (25); the width b1 of the radial sand bag (25) is equal to the width b2 of the annular sand bag (26), and is also equal to the length l of the anchor (221).

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