Offshore wind power foundation scour protection filling reinforcement construction device and method

Abstract

The present invention discloses an offshore wind power foundation scour protection filling reinforcement construction device and method. The on-site construction device and construction method are described in detail for different working conditions such as scour depth, speed and scour form, solving the problem that traditional technology is difficult to adapt to local conditions; through pre-construction detection, the optimal filling material and proportion under different working conditions are selected. A new type of double-layer slurry on-site transportation pipeline device is designed and applied, and both single-liquid slurry and double-liquid slurry can be used; an annular buckle device on the wind power pile foundation and a claw-shaped support device extending into the seabed are designed and applied to flexibly adjust the filling angle of the transportation pipeline, avoiding the shaking of the transportation pipeline and the construction ship during the construction process and affecting the safety of the pile foundation; using a depth detection sensor to automatically control the flow of the slurry to achieve accurate filling of grouting materials with a high degree of automation.

Description

Technical Field

[0001] The present invention relates to the field of offshore wind power pile foundation scour pit management, and in particular to an offshore wind power foundation scour protection filling reinforcement construction device and method. Background Art

[0002] Offshore wind power has become a key area of ​​my country's new energy development due to its green and environmentally friendly attributes and huge development potential, and is also an important part of my country's strategic emerging industries. my country has abundant offshore wind energy resources, but the complex marine environment will affect the stability and safety of offshore wind power foundations, especially for the most widely used single pile foundation.

[0003] The rapid flow of seawater will entrain the mud and sand around the single pile foundation, and the upper seabed surface around the single pile will be scoured. The ocean current will bypass the single pile foundation to form a horseshoe vortex in front of the pile and a tail vortex behind the pile. Under the combined action of the vortex and the downcurrent, a larger scour pit will be formed around the pile foundation, reducing the depth of the pile body extending into the seabed, thus seriously affecting the normal operation of offshore wind turbines. Therefore, it is very important to take protective measures for scour control.

[0004] Common anti-scour measures for single pile foundations include riprap protection and sand blanket protection. However, in recent years, many new construction schemes have emerged, such as bionic plant protection, tire protection, honeycomb protection and silt solidification, to enrich the choice of protection methods. Among these schemes, riprap protection has always been one of the most widely used forms of protection due to its convenient material acquisition and simple construction. However, we cannot ignore some problems of riprap protection, such as poor integrity, stones are easily washed away by high-speed water flow, and the later maintenance cost is high. Sand blanket protection solves the problem of riprap protection being easily washed away by water flow by sinking sand blankets around the pile foundation. However, sand blanket protection also has some limitations, such as low adjustability and is not suitable for larger scour pits. In addition, bionic plant protection also has some disadvantages, such as high construction cost and difficulty in construction.

[0005] Grout and solidified soil filling is an effective scour protection method, especially in terrestrial river management, because of its excellent water stability, scour resistance, integrity, plasticity and boundary ductility. However, in actual offshore wind power projects, grout filling protection is still in its infancy, and the current construction method has many shortcomings. These include the following points: (1) There is a lack of technology for targeted construction and optimal selection of filling materials based on important parameters such as different scour pit shapes and water flow velocities; (2) Under the dynamic flow of seawater, there is a possibility of collision between ships and pile foundations, and there are engineering difficulties such as violent shaking in the transportation pipeline, which urgently requires breakthroughs in stable filling technology; (3) There is a lack of professional and innovative slurry transportation pipelines for scour protection and filling reinforcement construction of offshore wind power foundations, and there is an urgent need to solve problems such as low degree of automation and high human resource consumption; (4) The filling speed cannot be accurately controlled, resulting in the slurry hitting the seabed and splashing; there is no optimal selection technology for slurry under special working conditions, resulting in the slurry being dispersed and lost by seawater, resulting in a lot of waste; (5) There is a lack of detailed technical applicability and practicality for the details and key points in the construction and filling process, which is not conducive to guiding actual construction. Summary of the invention

[0006] Aiming at the deficiencies of the existing protection technology in the field of wind power pile foundation scour pit protection, the present invention provides a construction device and method for offshore wind power foundation scour protection filling reinforcement.

[0007] The present invention adopts the following technical solution:

[0008] A construction method for scour protection and filling reinforcement of offshore wind power foundation, comprising:

[0009] 1) Pre-construction inspection and data analysis: Before repairing the scour pit of offshore wind power pile foundation, the terrain is scanned, the water flow velocity around the pile is detected, and the soil type is tested to provide reference data for the terrain around the pile, the elevation difference of the tidal flat, and the filling engineering quantity. According to the specific scour conditions around the pile and the protection design requirements, the number and location of the pile filling points to be constructed are determined, and the filling construction volume of each filling point is estimated;

[0010] 2) Material selection and preparation: Based on the relevant reference data provided by terrain scanning and water flow velocity detection, the temperature, fluidity and apparent density of the filling slurry are fully considered, and the optimal filling material and proportion are selected, and the selected materials are placed on the construction ship for subsequent construction use:

[0011] ① When the area around the pile is an erosion-type scour pit, that is, the scour pit is shallow but relatively wide, a quick-setting slurry should be used to fill it to quickly form a stable protective layer. h ≤ 3 m, maximum scouring width is 3~5 D (D is the pile diameter), select V普通硅酸盐水泥 : V 水玻璃 Ordinary Portland cement-water glass double liquid slurry with a volume ratio of 3:1 ~ 4:1; when the water flow velocity is 0.5 ~ 1.5 m / s and the seabed is mainly sandy, choose V 丙烯酸酯类聚合物乳液 : V 水 A polymer emulsion with a volume ratio of 1:0.8 to 1:1.2, and V 聚合物乳液 : V 填充材料 The volume ratio is 1:10 ~ 1:15;

[0012] ② When there is a scouring pit around the pile, that is, the scouring pit is deep but relatively small in width, a slurry with strong scouring resistance should be used to fill it. h >3 m and the maximum scouring width is D ~3 D, use sulphoaluminium silicate cement + 7~8% by mass polyurethane slurry; when the water velocity is 1.5~3.0 m / s and the seabed is mainly clay, use sea silt clay with a water content of 60~120% + 20~40% by mass ordinary silicate cement with a water-cement ratio of 0.5;

[0013] 3) Anchoring and positioning of the construction vessel: According to the location of the offshore wind turbine pile foundation and the point to be filled, the construction vessel is accurately positioned 3 to 6 meters away from the wind turbine pile and anchored by an anchor boat;

[0014] 4) Installation of annular clip devices around piles: According to the actual seawater depth and pile scouring conditions, annular clip devices a with springs and annular clip devices b with retractable rigid support circular tubes are installed on the wind power pile foundation from top to bottom, and the springs and circular tubes connected to the devices can move in a circular manner around the pile foundation;

[0015] 5) Laying out of double-layer slurry delivery pipeline: Assemble the double-layer slurry delivery pipeline on the construction ship. The feed end of the pipeline is connected to the delivery pump and placed in the mixing tank of the construction ship. The delivery pipeline is connected to the annular clip device a with a spring and the annular clip device b with a retractable rigid circular tube in sequence. Through the clip connection, a rotatable claw-shaped support device is set near the tip of the pipeline and extends into the seabed plane. The three work together to make the delivery pipeline tilt at different angles and point to the scouring pit; at the same time, ensure that the discharge port of the delivery pipeline is 0.5 to 1.5 m away from the seabed surface;

[0016] 6) Lubricate the pipe with clean water: Before transporting the slurry, fill the pipe system with clean water, check whether the pipe system and equipment are operating normally, and ensure that the entire pipe is fully cleaned. After the operation is completed, drain the liquid completely;

[0017] 7) Slurry preparation: According to the optimal ratio, add water to the powder of the preferred material in the mixing tank of the construction ship and mix evenly at a stirring rate of 60 to 120 r / min;

[0018] 8) Grout filling: Based on the estimated filling volume of the filling point of the delivery pipeline, use the spray head to evenly spray the grout into the scour pit in the scour pit area. On the basis of ensuring that the scour pit surface is fully filled and covered, continue to fill the grout at a lower spray speed (1 ~ 3 m / s) on the inner side near the pile to make it flow out naturally to the outside to form a slope. The optimal slope range is 1:2 ~ 1:4;

[0019] 9) Filling at another filling point: After the construction of the filling point is completed, the claw-shaped support device is separated from the seabed, and then the ship drives the transport pipeline through the annular buckle device, moves around the wind turbine pile foundation to another filling point, repeats the above slurry filling operation, and completes the construction of all filling points in sequence;

[0020] 10) Device removal and cleaning: After the construction is completed, the transport pipeline, claw-shaped support device and annular buckle device, etc. are removed and recovered, and the pipeline is disassembled and fully cleaned;

[0021] 11) Post-construction inspection and subsequent reinforcement: The construction area should be inspected 3 days and 28 days after construction to verify whether the slurry solidification effect meets the expected requirements. The compressive strength should be 10 ~ 15 MPa, the tensile strength should be 1.0 ~ 1.5MPa, and the slurry filling density should be not less than 90%. If it does not meet the above design requirements, it is necessary to consider subsequent reinforcement or secondary filling protection.

[0022] A construction device for scour protection and filling reinforcement of offshore wind power foundations mainly comprises annular clip devices a and b around piles, a double-layer slurry transport pipeline, a claw-shaped support device and an underwater detection system.

[0023] The inner ring of the pile-circumferential annular buckle device is provided with a plurality of rolling balls, and the outer ring is provided with a matching sliding annular groove, so that it can rotate around the wind power pile;

[0024] The pile-circumferential annular buckle device a is a device having a good rigidity spring installed at one end thereof, and the other end of the spring is connected to the slurry transport pipeline, so that it has good elasticity;

[0025] The pile-circumferential annular buckle device b is a device having a retractable supporting circular tube installed at one end thereof, and the other end of the circular tube is connected to the slurry transport pipeline, so that it has good supporting performance;

[0026] The slurry transport pipeline adopts a double-layer structure. If the preferred slurry is a double-liquid slurry, the inner layer is a transport pipe for one slurry, and the outer layer is a transport pipe for another slurry, and the two are isolated from each other by a specific partition structure; each slurry transport pipe is provided with an inlet and an outlet connection port; if the preferred slurry is a single-liquid slurry, the inner and outer layers can transport one slurry at the same time; at the same time, a slurry mixing section is provided at the end of the double-layer slurry transport pipeline, and a double-sided rotating blade device is provided to allow the two slurries to be evenly mixed here.

[0027] The claw-shaped support device is arranged at the tip of the slurry transport pipeline through a fan-shaped rotating device. The device is made of a light, hard and seawater corrosion-resistant material, and is firmly extended into the seabed through the tip main shaft and three surrounding tip claw-shaped components.

[0028] The underwater detection system includes an underwater camera, a sonar device and a depth detector; the underwater camera is used to monitor the real-time situation of the construction site, and can be operated by a diver or remotely controlled to observe and record.

[0029] The sonar device uses sonar technology to detect the seabed topography, geological conditions, and possible obstacles or dangerous factors around the wind power pile foundation.

[0030] The depth detector is arranged at the tip of the slurry transport pipeline, and based on the Internet of Things technology, remote depth monitoring of the filling slurry construction process is realized. When the expected filling requirements are completed, the valve is automatically controlled to close, and the construction parameters can be adjusted in time.

[0031] Furthermore, the annular buckle devices a, b and the claw-shaped supporting device work together to flexibly adjust the filling angle of the double-layer slurry transport pipeline to meet on-site filling needs.

[0032] Furthermore, the double-layer slurry transport pipeline is provided with control devices at the inlet and outlet of the pipeline, and a flow regulating valve is used at the inlet to control the entry ratio of the two slurries, and the flow ratio of the two slurries is adjusted as needed. An automatic control valve is used at the outlet, and when it is detected that the operation of a filling point is completed, the control valve will automatically close.

[0033] Furthermore, the outlet pipe of the double-layer slurry transport pipe is designed as a jet nozzle with adjustable speed, so that the mixed slurry can be accurately sprayed inside the pit.

[0034] Furthermore, the double-layer slurry transport pipeline is a segmented structure, consisting of four detachable parts spliced ​​together by threads.

[0035] Furthermore, the materials are optimized and prepared, wherein ordinary Portland cement shall comply with GB 175-2019 "Ordinary Portland Cement" standard, water glass shall comply with GB / T 14014-2018 "Inorganic Cementing Materials and Products" standard, acrylic polymers shall comply with GB / T 9264-2018 "Acrylic Emulsion Copolymer" standard, sulphoaluminosilica cement shall comply with GB8085-2017 "Sulphoaluminosilica Cement" standard, polyurethane shall comply with GB / T 8819-2017 "Polyurethane Rubber and Plastic Foaming Agent" standard, and marine silt clay can refer to relevant standards such as JGJ 11-2010 "Code for Design of Foundations and Subgrades for Buildings" and GB 50021-2001 "Code for Loads on Building Structures".

[0036] Furthermore, the materials should be optimized and prepared, the optimized materials should be properly stored and avoid expiration, and preliminary experiments should be conducted to verify the effectiveness and superiority of the selected materials.

[0037] Furthermore, the key points of slurry filling include but are not limited to: 4 to 6 filling points should be evenly set around the pile foundation, that is, it should be ensured that the slurry can evenly cover the scour pit; the best time for filling construction is 1 to 2 hours before and after high tide or low tide, that is, the seawater flow rate should be relatively stable; the cement slurry used should be used up within 1 hour of configuration, and the slurry should be continuously stirred during construction and cannot be used beyond the specified time, that is, the fluidity of the slurry should be ensured to meet the requirements; the order of slurry filling should be from bottom to top, that is, a good slurry filling effect should be ensured.

[0038] The present invention has the following beneficial effects:

[0039] 1) The present invention comprehensively analyzes the key parameters of the scour pits around different piles, such as depth, width, shape, soil quality, and water flow rate, according to different environmental conditions and scour forms. When the scour pit around the pile is an erosion-type scour pit, that is, the scour pit is shallow in depth but relatively wide, fast-setting slurry is used for filling. Fast-setting slurry can play a fast and effective protective role in construction due to its rapid coagulation and hardening characteristics, good fluidity, and chemical reaction with the surrounding environment. For example: V 丙烯酸酯类聚合物乳液 : V 水 A polymer emulsion with a volume ratio of 1:0.8 to 1:1.2, and V 聚合物乳液 : V 填充材料The volume ratio is 1:10 ~1:15; when the area around the pile is a scour pit, that is, the scour pit is deep but relatively small in width, a slurry with strong scour resistance is required for filling. The scour resistance slurry has high scour resistance and erosion resistance and proper fluidity, which can effectively prevent the scouring effect of water on the foundation. For example: marine silt clay with a water content of 60%~120% + 20%~40% mass ratio of ordinary Portland cement with a water-cement ratio of 0.5. By selecting the best filling material and its reasonable ratio, the problem of traditional technology being difficult to adapt to local conditions is solved, and a higher level of flexibility and adaptability is achieved in offshore wind power filling construction;

[0040] 2) The offshore wind power foundation scour protection filling reinforcement construction device and method provided by the present invention, wherein the annular buckle device is provided with a plurality of rolling balls through the inner ring, and the outer ring is provided with a sliding annular groove matching therewith, so as to facilitate the construction ship to travel in a circular manner around the wind power pile, effectively reach the protection radius and avoid the construction ship from hitting the pile, thereby ensuring the construction quality and engineering safety;

[0041] 3) The invention provides an offshore wind power foundation scour protection filling reinforcement construction device and method, wherein the annular buckle devices a and b are connected to the slurry transport pipeline through a spring with good rigidity and a retractable round tube respectively. At the same time, a claw-shaped support device is provided to be connected to the end of the pipeline. The three work together to firmly fix the transport pipeline to prevent the pipeline from shaking violently due to excessive wind and waves at sea. At the same time, the filling angle of the transport pipeline can be flexibly adjusted by telescoping or rotating according to the working conditions to adapt to different scour pit shapes and ensure uniform filling of the slurry;

[0042] 4) The invention provides an offshore wind power foundation scour protection filling reinforcement construction device and method, wherein the segmented slurry transport pipeline for easy transportation and cleaning is a double-layer structure, and a slurry mixing section with double-sided rotating blades is provided at the end of the pipeline to play a role in slurry mixing and stirring. This takes into account that quick-setting slurry is often used in seawater construction, but the slurry coagulation time is too fast, which is easy to clog the pipeline and cause great adverse effects on construction. Therefore, the double-layer transport pipeline designed by the present invention can effectively avoid the negative construction effects caused by the too fast coagulation time of the slurry, under the premise of being applied to various types of slurries;

[0043] 5) The invention provides an offshore wind power foundation scour protection filling reinforcement construction device and method, wherein a flow regulating valve is used at the inlet of the slurry transport pipeline to control the entry ratio of the two slurries to meet the required slurry ratio and realize the control of the slurry flow; an automatic control valve and a controllable injection head are used at the outlet, and a depth sensor is installed on the side of the pipeline. When the depth sensor detects that the filling is completed, the control valve will automatically close, with a high degree of automation, achieving precise and efficient construction, while greatly saving human resources and avoiding waste of grouting materials;

[0044] 6) The present invention explains the key points of slurry filling in detail, including that 4 to 6 filling points should be evenly set around the pile foundation, that is, the slurry should be evenly distributed in the scour pit; the best time for filling construction is 1 to 2 hours before and after high tide or low tide, that is, the seawater flow rate should be relatively stable; the cement slurry used should be used up within 1 hour of configuration, and the slurry should be continuously stirred during construction and cannot be used after exceeding the specified time, that is, the fluidity of the slurry should be ensured to meet the requirements; the order of slurry filling should be from bottom to top, that is, the slurry filling should be evenly distributed. The construction method of scour protection is systematically and comprehensively explained, which can guide and be applied to actual projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic diagram of the construction of an offshore wind power foundation scour protection device provided by an embodiment of the present invention.

[0046] Figure 2 This is a top view of the device construction provided by an embodiment of the present invention

[0047] Figure 3 This is a schematic diagram of a double-layer slurry transport pipeline and a diagram of the composition of detachable components provided by an embodiment of the present invention.

[0048] Figure 4 The top views of the annular buckle devices a and b provided in the embodiment of the present invention are

[0049] Figure 5 Schematic diagram of the protection of erosion-type scour pits provided by the embodiment of the present invention

[0050] Figure 6 Schematic diagram of the scour pit protection provided by the embodiment of the present invention

[0051] Figure 7 This is a flow chart of the scour protection construction method provided by an embodiment of the present invention

[0052] In the figure: 1. Construction ship; 2. Transport pipeline; 3. Wind power pipe pile; 4. Ring buckle device; 5. Retractable spring; 6. Retractable round tube; 7. Depth detector; 8. Claw support device; 9. Removable threaded connection part; 10. Delivery pump; 11. Mixing tank; 12. Double-sided mixing blades Specific implementation methods

[0053] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0054] The present invention provides a construction method for scour protection, filling and reinforcement of an offshore wind power foundation, comprising the following steps:

[0055] 1) Pre-construction inspection and data analysis: Before repairing the scour pit of the offshore wind power pile 3 foundation, the terrain is scanned, the water flow velocity around the pile is detected, and the soil type is tested to provide reference data for the terrain around the pile, the elevation difference of the tidal flat, and the filling project volume; according to the specific scour conditions around the pile and the protection design requirements, the number and location of the filling points of the pile to be constructed are determined, and the filling construction volume of each filling point is estimated;

[0056] 2) Material selection and preparation: Based on the relevant reference data provided by terrain scanning and water flow velocity detection, the temperature, fluidity and apparent density of the filling slurry are fully considered, and the optimal filling material and proportion are selected, and the selected materials are placed on the construction ship 1 for subsequent construction use:

[0057] ① When the area around the pile is an erosion-type scour pit, that is, the scour pit is shallow but relatively wide, a quick-setting slurry should be used to fill it to quickly form a stable protective layer. h ≤ 3 m, maximum scouring width is 3~5 D (D is the pile diameter), select V 普通硅酸盐水泥 : V 水玻璃 Ordinary Portland cement-water glass double liquid slurry with a volume ratio of 3:1 ~ 4:1; when the water flow velocity is 0.5 ~ 1.5 m / s and the seabed is mainly sandy, choose V 丙烯酸酯类聚合物乳液 : V 水 A polymer emulsion with a volume ratio of 1:0.8 to 1:1.2, and V 聚合物乳液 : V 填充材料 The volume ratio is 1:10 ~ 1:15;

[0058] ② When there is a scouring pit around the pile, that is, the scouring pit is deep but relatively small in width, a slurry with strong scouring resistance should be used to fill it. h >3 m and the maximum scouring width is D ~3 D, use sulphoaluminium silicate cement + 7~8% by mass polyurethane slurry; when the water velocity is 1.5~3.0 m / s and the seabed is mainly clay, use sea silt clay with a water content of 60~120% + 20~40% by mass ordinary silicate cement with a water-cement ratio of 0.5;

[0059] 3) Anchoring and positioning of the construction vessel: According to the location of the offshore wind turbine pile foundation 3 and the point to be filled, the construction vessel 1 is accurately positioned 3 to 6 meters away from the wind turbine pile, and anchored by an anchor boat;

[0060] 4) Installation of annular clip devices around piles: According to the actual seawater depth and pile scouring conditions, annular clip devices a (5) with springs and annular clip devices b (6) with retractable rigid support circular tubes are installed on the wind power pile foundation from top to bottom, and the springs 5 ​​and circular tubes 6 connected to the devices can both move in a circular manner around the pile foundation;

[0061] 5) Laying out the double-layer slurry delivery pipeline: Assemble the double-layer slurry delivery pipeline 2 on the construction vessel 1. The feed end of the pipeline 2 is connected to the delivery pump 10 and placed in the mixing tank 11 of the construction vessel. The delivery pipeline 2 is connected to the annular clip device a (5) with a spring and the annular clip device b (6) with a retractable rigid circular tube in sequence. Through the clip connection, a rotatable claw-shaped support device 8 is provided near the tip of the pipeline and extends into the seabed plane. The three cooperate to make the delivery pipeline 2 tilt at different angles and point to the scouring pit; at the same time, ensure that the discharge port of the delivery pipeline 2 is 0.5 to 1.5 m away from the seabed surface;

[0062] 6) Lubricate the pipe with clean water: Before transporting the slurry, fill the pipe system with clean water, check whether the pipe system and equipment are operating normally, and ensure that the entire pipe 2 is fully cleaned. After the operation is completed, drain the liquid completely.

[0063] 7) Slurry preparation: according to the optimal ratio, the powder of the preferred material is mixed with water and stirred evenly in the mixing tank 11 of the construction vessel at a stirring rate of 60 to 120 r / min.

[0064] 8) Grout filling: Based on the estimated filling volume of the filling point of the delivery pipeline 2, use the spray head to evenly spray the grout into the scour pit in the scour pit area. On the basis of ensuring that the scour pit surface is fully filled and covered, continue to fill the grout at a lower spraying speed (1 to 3 m / s) on the inner side near the pile to make it flow out naturally to the outside to form a slope. The optimal slope range is 1:2 to 1:4;

[0065] 9) Changing filling points: After the construction of the filling point is completed, the claw-shaped support device 8 is separated from the seabed, and then the ship drives the transport pipeline through the annular buckle device 4, moves around the wind turbine pile foundation 3 to another filling point, repeats the above slurry filling operation, and completes the construction of all filling points in turn.

[0066] 10) Device removal and cleaning: After the construction is completed, the transport pipeline 2, the claw-shaped support device 8 and the annular buckle device 4 are removed and recovered, and the pipeline 2 is disassembled and thoroughly cleaned.

[0067] 11) Post-construction inspection and subsequent reinforcement: The construction area should be inspected 3 days and 28 days after construction to verify whether the slurry solidification effect meets the expected requirements. The compressive strength should be 10 ~ 15 MPa, the tensile strength should be 1.0 ~ 1.5MPa, and the slurry filling density should be not less than 90%. If it does not meet the above design requirements, it is necessary to consider subsequent reinforcement or secondary filling protection.

[0068] The invention discloses a construction device for scour protection and filling reinforcement of an offshore wind power foundation, which mainly comprises annular clip devices a (5) and b (6) around the pile, a double-layer slurry transport pipeline 2, a claw-shaped support device 8 and an underwater detection system.

[0069] like Figure 4 As shown, the inner ring of the pile peripheral annular buckle device 4 is provided with a plurality of rolling balls, and the outer ring is provided with a matching sliding annular groove, so that it can rotate around the wind power pile;

[0070] The pile-circumferential annular buckle device a (5) is a device having a good rigidity spring installed at one end thereof, and the other end of the spring is connected to the slurry transport pipeline, so that the device has good elasticity;

[0071] The pile-circumferential annular buckle device b (6) is a device having a retractable supporting circular tube installed at one end thereof, and the other end of the circular tube is connected to the slurry transport pipeline, so that the device has good supporting performance;

[0072] like Figure 3 As shown, the slurry transport pipeline 2 adopts a double-layer structure. If the preferred slurry is a double-liquid slurry, the inner layer is a transport pipe for one slurry, and the outer layer is a transport pipe for another slurry, and the two are isolated from each other by a specific partition structure; each slurry transport pipe is provided with an inlet and an outlet connection port; if the preferred slurry is a single-liquid slurry, the inner and outer layers can transport one slurry at the same time; at the same time, a slurry mixing section is arranged at the end of the double-layer slurry transport pipeline, and the two slurries are evenly mixed here by arranging a double-sided rotating blade device.

[0073] like Figure 3 As shown, the claw-shaped support device 8 is arranged at the tip of the slurry transport pipeline through a fan-shaped rotating device. The device is made of a light, hard and seawater corrosion-resistant material, and is firmly extended into the seabed through the tip main shaft and three surrounding tip claw-shaped components.

[0074] The underwater detection system includes an underwater camera, a sonar device and a depth detector 7:

[0075] Underwater camera devices are used to monitor the real-time situation of the construction site, and can be operated by divers or remotely controlled to observe and record;

[0076] The sonar device uses sonar technology to detect the seabed topography, geological conditions, and possible obstacles or dangerous factors around the wind turbine pile foundation;

[0077] like Figure 3 As shown, the depth detector 7 is arranged at the tip of the slurry transport pipeline. Based on the Internet of Things technology, remote depth monitoring of the filling slurry construction process is realized. When the expected filling requirements are completed, the valve is automatically controlled to close, and the construction parameters can be adjusted in time.

[0078] like Figure 1 As shown, the annular buckle devices a, b and the claw-shaped support device work together to flexibly adjust the filling angle of the double-layer slurry transport pipeline to meet the on-site filling needs.

[0079] like Figure 3 As shown, the double-layer slurry transport pipeline is provided with control devices at the inlet and outlet of the pipeline. The inlet adopts a flow regulating valve to control the entry ratio of the two slurries, and the flow ratio of the two slurries is adjusted as needed. The outlet adopts an automatic control valve, and when it is detected that the operation of a filling point is completed, the control valve will automatically close.

[0080] like Figure 3 As shown, the outlet pipe of the double-layer slurry transport pipeline is designed as a jet nozzle with adjustable speed, so that the mixed slurry can be accurately sprayed inside the pit.

[0081] like Figure 3 As shown, the double-layer slurry transport pipeline is a segmented structure, which is composed of four detachable parts connected by threads.

[0082] For material selection and preparation, ordinary Portland cement should comply with GB 175-2019 "Ordinary Portland Cement", water glass should comply with GB / T 14014-2018 "Inorganic Cementing Materials and Products", acrylic polymers should comply with GB / T 9264-2018 "Acrylic Copolymer Emulsion", sulphoaluminum silicate cement should comply with GB 8085-2017 "Sulphoaluminum Silicate Cement", polyurethane should comply with GB / T 8819-2017 "Polyurethane Rubber and Plastic Foaming Agent" standard, and marine silt clay can refer to relevant standards such as JGJ 11-2010 "Code for Design of Foundations and Subgrades for Buildings" and GB 50021-2001 "Code for Loads on Building Structures".

[0083] Regarding material selection and preparation, the selected materials should be properly stored and avoid expiration, and preliminary experiments should be carried out to verify the effectiveness and superiority of the selected materials.

[0084] The key points for slurry filling include but are not limited to: 4 to 6 filling points should be evenly set around the pile foundation, that is, it should be ensured that the slurry can evenly cover the scour pit; the best time for filling construction is 1 to 2 hours before and after high tide or low tide, that is, the seawater flow rate should be relatively stable; the cement slurry used should be used up within 1 hour of configuration, and the slurry should be constantly stirred during construction and cannot be used after the specified time, that is, the fluidity of the slurry should meet the requirements; the order of slurry filling should be from bottom to top, that is, a good slurry filling effect should be ensured.

[0085] like Figure 5 and Figure 6 As shown, the comparison between the erosion-type scour pit and the scour-type scour pit before and after protection shows that the filling slurry naturally flows outward to form a slope, thus achieving a good protection effect. Example

[0086] The C# offshore wind farm in Shenzhen, Guangdong is located in the South China Sea, about 25km from the land and about 35m deep. According to the measured data of geological survey, the average wave height throughout the year is 1.4m, the maximum wave height can reach 6.8m, and the measured maximum flow rate is 1.3m / s. The seabed is mainly composed of silt and sandy silt, and the overall terrain is relatively small. The underwater terrain data around the wind farm pile foundation was collected using a multi-beam bathymetric system and a sound velocity profiler. It was found that the scour pits were mainly of corrosion and erosion type, with a maximum expansion range of up to 4 times the pile diameter and a maximum depth of up to 2.8m. It can be seen that the scour pits around the piles develop rapidly. During the construction of the project, timely measures should be taken to reinforce the soil to prevent larger scour pits from being generated due to time delays.

[0087] According to the analysis of the above-mentioned relevant reference data, it is recommended to use fast-setting slurry - the volume ratio of ordinary silicate cement: water glass = 4:1 for filling, so as to quickly form a stable protective layer. At the same time, the temperature of the filling slurry should meet the construction requirements, and it is recommended to be between 20℃ and 30℃; the fluidity of the slurry should be moderate, and it is advisable to control it between 12-20 cm to ensure that the scour pit can be fully filled without generating gaps; the apparent density should be high enough, and it is recommended to control it between 2.1-2.3 g / cm³ to ensure that a uniform and tight protective layer can be formed after filling; finally, the selected materials are placed on the construction ship for subsequent construction use; Example

[0088] The A# offshore wind farm in Ningbo, Zhejiang is located in the East China Sea, about 35km from the land and about 30m deep. According to the measured data of geological survey, the average wave height throughout the year is 1.6m, the maximum wave height can reach 7.2m, and the measured maximum flow velocity is 2.4m / s. The seabed is mainly fine sand and silt, and the overall terrain is relatively small. The underwater terrain data around the wind farm pile foundation was collected using a multi-beam bathymetric system and a sound velocity profiler. It was found that the scour pits were mainly scour erosion type, with a maximum expansion range of up to 3 times the pile diameter and a maximum depth of up to 4m. It can be seen that the scour pits around the piles develop rapidly. During the construction, timely measures should be taken to reinforce the soil to prevent larger scour pits from being generated due to time delays.

[0089] According to the analysis of the above-mentioned relevant reference data, it is recommended to use fast-setting slurry - the weight ratio of each component is: 100 parts of epoxy resin, 40 parts of curing agent, 30 parts of diluent, and 400 parts of filler for filling, so as to quickly form a stable protective layer. At the same time, the temperature of the filling slurry should meet the construction requirements, and it is recommended to be between 10°C and 25°C; the fluidity of the slurry should be moderate, and it is advisable to control it between 12-20 cm, which will ensure that the slurry can fully fill the pits and achieve the required density without generating gaps; the apparent density should be high enough, and it is recommended to control it between 2.0-2.5 g / cm³ to ensure that the protective layer formed after filling has sufficient density and strength; finally, the selected materials are placed on the construction ship for subsequent construction use; Example

[0090] Shandong Weihai Y# offshore wind farm is located in the Yellow Sea, about 20 km from the land and about 25 m deep. According to the measured data of geological survey, the average wave height throughout the year is 1.5 m, the maximum wave height can reach 9.2 m, and the measured maximum flow velocity is 2.6 m / s. The seabed is mainly composed of silt and silt, and the overall terrain is undulating. The underwater terrain data around the wind farm pile foundation was collected using a multi-beam bathymetric system and a sound velocity profiler. It was found that the scour pits were mainly scour type, with a maximum extension range of 2.5 times the pile diameter and a maximum depth of 4.5 m. It can be seen that the scour pits around the piles develop rapidly. During the construction, measures should be taken in time to reinforce the soil to prevent larger scour pits from being generated due to time delays.

[0091] According to the analysis of the above-mentioned relevant reference data, it is recommended to use erosion-resistant slurry - sulphoaluminum silicate cement + 8% mass ratio of polyurethane for filling to resist the large seawater erosion flow rate. At the same time, the temperature of the filling slurry should meet the construction requirements, and it is recommended to be between 5℃ and 30℃; the fluidity of the slurry should be moderate, and it is advisable to control it between 10-15 cm to ensure uniform and dense filling; the apparent density should be high enough, and it is recommended to control it between 2.0-2.5 g / cm³ to ensure that the protective layer formed after filling has sufficient density and strength; finally, the selected material is placed on the construction ship for subsequent construction use.

[0092] It should be noted that the detailed description of the above series of construction methods, devices and preferred embodiments is not intended to limit the protection scope of the present invention. Any equivalent embodiments or improvements that do not depart from the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for scour protection and filling reinforcement of offshore wind power foundation, characterized in that: include: 1) Pre-construction inspection and data analysis: Before repairing the scour pit of offshore wind power pile foundation, the terrain is scanned, the water flow velocity around the pile is detected, and the soil type is tested to provide reference data for the terrain around the pile, the elevation difference of the tidal flat, and the filling engineering quantity; according to the specific scour conditions around the pile and the protection design requirements, the number and location of the pile filling points to be constructed are determined, and the filling construction volume of each filling point is estimated; 2) Material selection and preparation: Based on the relevant reference data provided by terrain scanning and water flow velocity detection, the temperature, fluidity and apparent density of the filling slurry are fully considered, the filling materials and proportions are selected, and the selected materials are placed on the construction ship for subsequent construction use: ① When there is an erosion-type scour pit around the pile, that is, the scour pit is shallow but relatively wide, fast-setting slurry should be used for filling to quickly form a stable protective layer; when the maximum scour depth around the pile is h ≤ 3 m and the maximum scour width is 3~5 D, where D is the diameter of the pile foundation, V 普通硅酸盐水泥 :V 水玻璃 Ordinary Portland cement-water glass double liquid slurry with a volume ratio of 3:1 ~ 4:1; when the water flow velocity is 0.5 ~ 1.5 m / s and the seabed is mainly sandy, V 丙烯酸酯类聚合物乳液 :V 水 The volume ratio of polymer emulsion is 1:0.8 ~ 1:1.2, and V 聚合物乳液 :V 填充材料 The volume ratio is 1:10 ~ 1:15; ② When there is a scour pit around the pile, that is, the scour pit is deep but relatively small in width, a slurry with strong scour resistance is required to fill it; when the maximum scour depth around the pile is h > 3 m and the maximum scour width is D ~ 3 D, sulphoaluminium silicate cement + 7 ~ 8% mass ratio polyurethane slurry is selected; when the water flow velocity is 1.5 ~ 3.0 m / s and the seabed is mainly clay, choose sea silt clay with a water content of 60 ~ 120% + 20 ~ 40% mass ratio and ordinary silicate cement with a water-cement ratio of 0.5; 3) Anchoring and positioning of the construction vessel: According to the location of the offshore wind turbine pile foundation and the point to be filled, the construction vessel is accurately positioned 3 to 6 meters away from the wind turbine pile and anchored by an anchor boat; 4) Installation of annular clip devices around piles: According to the actual seawater depth and pile scouring conditions, annular clip devices a with springs and annular clip devices b with retractable rigid support circular tubes are installed on the wind power pile foundation from top to bottom, and the springs and circular tubes connected to the devices can move in a circular manner around the pile foundation; 5) Laying out of double-layer slurry delivery pipeline: Assemble the double-layer slurry delivery pipeline on the construction ship. The feed end of the pipeline is connected to the delivery pump and placed in the mixing tank of the construction ship. The delivery pipeline is connected to the annular clip device a with a spring and the annular clip device b with a retractable rigid circular tube in sequence. Through the clip connection, a rotatable claw-shaped support device is set near the tip of the pipeline and extends into the seabed plane. The three work together to make the delivery pipeline tilt at different angles and point to the scouring pit; at the same time, ensure that the discharge port of the delivery pipeline is 0.5 to 1.5 m away from the seabed surface; 6) Lubricate the pipe with clean water: Before conveying the slurry, fill the pipe system with clean water, check whether the pipe system and equipment are operating normally, and ensure that the entire pipe is fully cleaned; after the operation is completed, drain the liquid completely; 7) Slurry preparation: according to the proportion, add water to the powder and stir evenly in the mixing tank of the construction ship at a stirring rate of 60 ~ 120 r / min; 8) Grout filling: Based on the estimated filling volume of the filling point of the delivery pipeline, use the spray head to evenly spray the grout into the scour pit in the scour pit area. On the basis of ensuring that the scour pit surface is fully filled and covered, continue to fill the grout at the inner side near the pile at a spray speed of 1 to 3 m / s, so that it flows out naturally to the outside to form a slope with a slope range of 1:2 to 1:4; 9) Filling at another filling point: After the construction of the filling point is completed, the claw-shaped support device is separated from the seabed, and then the ship drives the transport pipeline through the annular buckle device, moves around the wind turbine pile foundation to another filling point, repeats the above slurry filling operation, and completes the construction of all filling points in sequence; 10) Device removal and cleaning: After the construction is completed, the transport pipeline, claw-shaped support device and annular buckle device are removed and recovered, and the pipeline is disassembled and fully cleaned; 11) Post-construction inspection and subsequent reinforcement: The construction area should be inspected 3 days and 28 days after construction to verify whether the slurry solidification effect meets the expected requirements. The compressive strength should be 10 ~ 15 MPa, the tensile strength should be 1.0 ~ 1.5 MPa, and the slurry filling density should be not less than 90%. If it does not meet the above design requirements, subsequent reinforcement or secondary filling protection should be considered.

2. The construction method for scour protection and filling reinforcement of offshore wind power foundation according to claim 1 is characterized in that: The materials are optimized and prepared, the selected materials should be properly stored and avoid expiration, and preliminary experiments should be conducted to verify the effectiveness and superiority of the selected materials.

3. The construction method for scour protection and filling reinforcement of offshore wind power foundation according to claim 1, characterized in that: The key points of slurry filling include: 4 to 6 filling points should be evenly set around the pile foundation, that is, it should be ensured that the slurry can evenly cover the scour pit; the filling construction time is 1 to 2 hours before and after high tide or low tide, that is, the seawater flow rate should be relatively stable; the cement slurry used should be used up within 1 hour of configuration, and the slurry should be continuously stirred during construction and cannot be used beyond the specified time, that is, the fluidity of the slurry should meet the requirements; the order of slurry filling should be from bottom to top, that is, a good slurry filling effect should be ensured.

4. A construction device for scour protection and filling reinforcement of offshore wind power foundation, characterized in that: The construction device mainly includes annular clip devices a and b around the pile, a double-layer slurry transport pipeline, a claw-shaped support device and an underwater detection system; The inner ring of the pile-circumferential annular buckle device is provided with a plurality of rolling balls, and the outer ring is provided with a matching sliding annular groove, so that it can rotate around the wind power pile; The pile-circumferential annular buckle device a is a device having a good rigidity spring installed at one end thereof, and the other end of the spring is connected to the slurry transport pipeline, so that it has good elasticity; The pile-circumferential annular buckle device b is a device having a retractable supporting circular tube installed at one end thereof, and the other end of the circular tube is connected to the slurry transport pipeline, so that it has good supporting performance; The slurry transport pipeline adopts a double-layer structure. If the slurry is a double-liquid slurry, the inner layer is a transport pipe for one slurry, and the outer layer is a transport pipe for another slurry, and the two are isolated from each other by a specific partition structure; each slurry transport pipe is provided with an inlet and an outlet connection; if the slurry is a single-liquid slurry, the inner and outer layers can transport one slurry at the same time; at the same time, a slurry mixing section is provided at the end of the double-layer slurry transport pipeline, and a double-sided rotating blade device is provided to make the two slurries evenly mixed here; The claw-shaped support device is arranged at the tip of the slurry transport pipeline through a fan-shaped rotating device. The device is made of a light, hard and seawater corrosion-resistant material, and is firmly extended into the seabed through the tip main shaft and three surrounding tip claw-shaped parts; The underwater detection system includes an underwater camera, a sonar device and a depth detector: The underwater camera device is used to monitor the real-time situation of the construction site, and can be operated by a diver or remotely controlled to observe and record; The sonar device uses sonar technology to detect the seabed topography, geological conditions, and possible obstacles or dangerous factors around the wind power pile foundation; The depth detector is arranged at the tip of the slurry transport pipeline, and based on the Internet of Things technology, remote depth monitoring of the filling slurry construction process is realized. When the expected filling requirements are completed, the valve is automatically controlled to close, and the construction parameters are adjusted in time.

5. A construction device for scour protection and filling reinforcement of offshore wind power foundation as claimed in claim 4, characterized in that: The annular buckle devices a, b and the claw-shaped support device work together to flexibly adjust the filling angle of the double-layer slurry transport pipeline to meet on-site filling needs.

6. A construction device for scour protection and filling reinforcement of offshore wind power foundation as claimed in claim 4, characterized in that: The double-layer slurry transport pipeline is provided with control devices at the inlet and outlet of the pipeline. A flow regulating valve is used at the inlet to control the entry ratio of the two slurries, and the flow ratio of the two slurries is adjusted as needed; an automatic control valve is used at the outlet, and when it is detected that the operation of a filling point is completed, the control valve will automatically close.

7. A construction device for scour protection and filling reinforcement of offshore wind power foundation as claimed in claim 4, characterized in that: The outlet pipe of the double-layer slurry transport pipe is designed as a jet nozzle with adjustable speed, so that the mixed slurry can be accurately sprayed into the inside of the scouring pit.

8. The construction device for scour protection and filling reinforcement of offshore wind power foundation according to claim 4, characterized in that: The double-layer slurry transport pipeline is a segmented structure, which is composed of four detachable parts spliced ​​together by threads.

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