Collapse hole treatment device, use method and treatment method for offshore wind power inclined pile embedded in rock construction

Abstract

An offshore wind power inclined pile embedded in rock construction collapse hole treatment device, use method and treatment method, comprising a steel pipe pile (1), an inner casing (2), an inner casing follower (3) and a straightener (5); wherein the steel pipe pile (1) is cylindrical with two ends open, an inner casing (2) is installed at the bottom of the steel pipe pile (1), a straightener (5) and an inner casing follower (3) are arranged inside the steel pipe pile (1), a drill rod (8) penetrates and extends into the straightener (5) and the inner casing follower (3), and a drill bit (4) is installed at the end of the drill rod (8). The present invention adopts the method of inner casing follower plugging to solve the problem of inclined pile collapse hole. The difficulty of complex seabed rock formations and limited space construction is overcome. It has the advantages of convenient and fast construction, good economic benefits, and ensuring the safety of offshore operations.

Description

Technical Field

[0001] The invention relates to the field of wind power, and in particular to a device for processing collapsed holes in offshore wind power inclined pile embedded rock construction, a use method and a processing method. Background Art

[0002] In recent years, with the continuous development of wind power industry, the development and application of new technologies, new processes and new materials, offshore wind power with rich resources, high power generation hours, no land occupation, no water consumption and suitable for large-scale development is in a rapid development stage. The high pile cap foundation is suitable for areas with a certain water depth and shallow seabed without sufficient natural foundation conditions. Its technology is becoming more and more mature and has been widely used.

[0003] At present, in the process of rock embedding of inclined piles in offshore wind farms, the seabed rock strata are complex, and the hole wall is disturbed by tides and water flow, so sand leakage and hole collapse often occur. Since the rock strata at the junction of steel pipe pile 1 and the rock embedding section are greatly disturbed by tides, the hole collapse position is generally 1-3 meters from the exit section of steel pipe pile 1. The hole collapse greatly increases the difficulty of construction, resulting in the consumption of a large number of ships, machinery, materials and personnel, and prolongs the construction period, making it impossible to ensure the normal construction progress. Summary of the invention

[0004] The present invention provides a device, a use method and a treatment method for the collapsed hole treatment of offshore wind power inclined pile embedded in rock construction, the purpose of which is to promptly deal with the problem of inclined pile collapsed hole, avoid the occurrence of quality and safety accidents, reduce costs, and ensure the normal construction of inclined piles.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for processing collapsed holes in rock-embedded construction of offshore wind power inclined piles comprises a steel pipe pile 1, an inner casing 2, an inner casing follower 3 and a centralizer 5; wherein the steel pipe pile 1 is in a cylindrical shape with openings at both ends, the inner casing 2 is installed at the bottom of the steel pipe pile 1, the centralizer 5 and the inner casing follower 3 are arranged inside the steel pipe pile 1, a drill rod 8 penetrates and extends into the centralizer 5 and the inner casing follower 3, and a drill bit 4 is installed at the end of the drill rod 8.

[0007] A method for using a hole collapse treatment device for offshore wind power inclined pile embedded in rock construction includes the following steps: when the inclined pile collapses during the drilling process, the drill rig is used to timely raise the drill bit 4, and the steel pipe pile 1 is continuously injected with water to keep the water head inside the steel pipe pile 1 higher than the water head outside the pile as much as possible to prevent the collapse area from further expanding. The processed inner casing is placed inside the steel pipe pile 1, and the drill bit 4 with an inner casing follower is placed down to pump sand and clean the hole. At the same time, under the drive of the drilling rig, the inner casing follower presses the inner casing downward, and the drilling rig applies pressure every time it pumps a part of sand material, pressing down the inner casing, step by step, so as to advance to the sand leakage position, and the inner casing blocks the sand leakage point. When there is no more sand leakage in the steel pipe pile 1, the drill is raised, the position of the follower is changed, and it is moved up to be used as a guide drill rod 8, and drilling is continued to check the plugging effect. If there is still sand leakage in the steel pipe pile 1, the inner casing is continued to be pushed until the plugging is completed.

[0008] A method for processing a collapsed hole in an offshore wind power inclined pile embedded in a rock construction comprises the following steps:

[0009] Step 1: Use the drill to pull out the drill bit;

[0010] Step 2: Processing guide of inner casing side wall;

[0011] Step 3: Place inner casing inside the steel pipe pile 1;

[0012] Step 4: Drill down to pump out sand and clean the hole, and follow up with the inner casing;

[0013] Step 5: Re-drill to check the plugging effect;

[0014] Step 6: Drilling and pouring.

[0015] The present invention also has the following additional technical features:

[0016] As a further specific optimization of the technical solution of the present invention: the side wall of the inner casing 2 must be processed for guidance to ensure that the inner casing can reach the bottom of the hole; the side wall of the inner casing 2 is vertically welded with guide steel bars 6; the guide steel bars 6 have a width of 3 cm, a height of 4 cm, a diameter of 12-20 mm, and a length that does not exceed the length of the inner casing 2.

[0017] As a further specific optimization of the technical solution of the present invention: the inner casing 2 should be opened with holes, so that the slurry can overflow from the reserved holes when the concrete is poured; overflow holes 7 are opened on the outer wall of the inner casing 2, the overflow holes 7 are 50 cm high, 5 cm wide, and the number is not less than 4, and the position of the overflow holes 7 is 2-3m away from the bottom end of the inner casing 2.

[0018] As a further specific optimization of the technical solution of the present invention: the diameter of the inner casing follower 3 is 8-10 cm larger than the diameter of the inner casing 2, and can be used as both a downward pressing device and a centralizer; under the power of the drilling rig, the inner casing follower 3 drills along with the drill rod 8, and then presses the inner casing 2 to move downward.

[0019] As a further specific optimization of the technical solution of the present invention: the inner casing follower 3 includes a central drill rod 3-1, a roller 3-2, a central tube 3-3, upper and lower baffles 3-4, a wing plate 3-5, a web 3-6 and an annular steel ring 3-7; wherein, upper and lower baffles 3-4 are provided at the upper and lower ends of the central tube 3-3 in the middle of the central drill rod 3-1, and the upper and lower baffles 3-4 include an upper baffle and a lower baffle; a plurality of rollers 3-2 are evenly arranged around the central drill rod 3-1, and the top of the roller 3-2 is clamped on the bottom of the upper baffle, and the bottom of the roller 3-2 is clamped on the top of the lower baffle; a plurality of rollers 3-2 and the central drill rod 3-1 form a combination;

[0020] As a further specific optimization of the technical solution of the present invention: an annular steel ring 3-7 is arranged on the outer periphery of the central drill rod 3-1, and a plurality of webs 3-6 are arranged on the inner side of the annular steel ring 3-7, the inner end of the web 3-6 is mounted on the central drill rod 3-1, and the outer end of the web 3-6 is mounted on the inner side of the annular steel ring 3-7; a wing plate 3-5 is further arranged on the top between the spaced webs 3-6; the central tube 3-3, the wing plate 3-5, the web 3-6, and the annular steel ring 3-7 are connected to form a combination;

[0021] As a further specific optimization of the technical solution of the present invention: the central tube 3-3 is connected to the central drill rod 3-1, and all components are connected together to form an inner casing follower; the inner casing follower 3 is connected to the matching drill rod 8 through the central drill rod 3-1 through a threaded connection and lowered into the steel pipe pile 1.

[0022] As a further specific optimization of the technical solution of the present invention: an inverted convex opening is provided at the top of the central drill rod 3-1, so as to be connected with the matching drill rod 8 through threads and lowered into the steel pipe pile 1.

[0023] As a further specific optimization of the technical solution of the present invention: the centralizer 5 includes a centralizer body 51 in a circular ring shape, the center of the centralizer body 51 is a drill hole 54, the outer side of the centralizer body 51 is arrayed with connecting rods 53, and the ends of the connecting rods 53 are provided with arc-shaped centralizing blocks 52, and the outer arc of the centralizing block 52 matches the inner arc of the steel pipe pile 1.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] Advantage 1: Inner casing follower 3, the center drill rod is fixed with the upper and lower baffles, and the rollers are evenly distributed around the center drill rod to form a combination with the center drill rod. The center tube is connected with the wing plate, the web plate, and the annular steel ring to form a combination. The center tube is connected to the center drill rod, and all components are connected together to form an inner casing follower. It has the advantages of simple operation, fast construction speed, and low construction cost.

[0026] Advantage 2: The present invention adopts the method of inner casing to follow up and plug the leak, so that the problem of inclined pile hole collapse is solved. It overcomes the difficulties of complex seabed rock formations and limited space construction. It has the advantages of convenient and fast construction, good economic benefits, and ensuring the safety of offshore operations.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the device for processing collapsed holes in offshore wind power inclined pile embedded in rock construction according to the present invention;

[0030] Figure 2 It is a structural schematic diagram of the inner casing follower 3 of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the practical inner casing follower 3;

[0032] Figure 4 It is a structural schematic diagram of the practical inner casing follower 3;

[0033] Figure 5 It is a schematic structural diagram of the centralizer 5 of the present invention;

[0034] Figure 6 It is a schematic structural diagram of the inner casing 2 of the present invention.

[0035] In the figure: steel pipe pile 1; inner casing 2; inner casing follower 3; center drill rod 3-1; roller 3-2; center tube 3-3; upper and lower baffles 3-4; wing plate 3-5; web 3-6; annular steel ring 3-7; drill bit 4; stabilizer 5; guide steel bar 6; overflow hole 7; drill rod 8. DETAILED DESCRIPTION

[0036] The exemplary embodiments disclosed in the present invention will be described in more detail below with reference to the accompanying drawings. These embodiments are intended to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. Although the exemplary embodiments disclosed in the present invention are shown in the accompanying drawings, it should be understood that the present invention should not be limited by the embodiments described herein.

[0037] A device for processing collapsed holes in rock-embedded construction of offshore wind power inclined piles comprises a steel pipe pile 1, an inner casing 2, an inner casing follower 3 and a centralizer 5; wherein the steel pipe pile 1 is in a cylindrical shape with openings at both ends, the inner casing 2 is installed at the bottom of the steel pipe pile 1, the centralizer 5 and the inner casing follower 3 are arranged inside the steel pipe pile 1, a drill rod 8 penetrates and extends into the centralizer 5 and the inner casing follower 3, and a drill bit 4 is installed at the end of the drill rod 8.

[0038] The side wall of the inner casing 2 must be processed with a guide to ensure that the inner casing can reach the bottom of the hole; the side wall of the inner casing 2 is vertically welded with a guide steel bar 6; the guide steel bar 6 has a width of 3 cm, a height of 4 cm, a diameter of 12-20 mm, and a length that does not exceed the length of the inner casing 2.

[0039] The inner casing 2 should be perforated so that the slurry can overflow from the reserved holes when the concrete is poured; overflow holes 7 are opened on the outer wall of the inner casing 2, the overflow holes 7 are 50 cm high, 5 cm wide, and there are no less than 4 of them, and the position of the overflow holes 7 is 2-3m away from the bottom end of the inner casing 2.

[0040] The diameter of the inner casing follower 3 is 8-10 cm larger than that of the inner casing 2, and can be used as a downward pressing device and a centralizer. Under the power of the drilling rig, the inner casing follower 3 drills with the drill rod 8 and then presses the inner casing 2 to move downward.

[0041] The inner casing follower 3 includes a center drill rod 3-1, a roller 3-2, a center tube 3-3, upper and lower baffles 3-4, a wing plate 3-5, a web 3-6 and an annular steel ring 3-7; wherein, upper and lower baffles 3-4 are arranged at the upper and lower ends of the center tube 3-3 in the middle of the center drill rod 3-1, and the upper and lower baffles 3-4 include an upper baffle and a lower baffle; reinforcing ribs are arranged on the outer sides of the upper baffle and the lower baffle.

[0042] The eight rollers 3-2 are evenly arranged around the central drill rod 3-1, and the top of the roller 3-2 is clamped on the bottom of the upper baffle, and the bottom of the roller 3-2 is clamped on the top of the lower baffle; a plurality of rollers 3-2 and the central drill rod 3-1 form a combination.

[0043] An annular steel ring 3-7 is arranged on the outer periphery of the center drill rod 3-1, and a plurality of webs 3-6 are arranged on the inner side of the annular steel ring 3-7. The inner ends of the webs 3-6 are mounted on the center drill rod 3-1, and the outer ends of the webs 3-6 are mounted on the inner side of the annular steel ring 3-7. Wing plates 3-5 are also arranged on the tops between the spaced webs 3-6. The center tube 3-3, the wing plates 3-5, the webs 3-6, and the annular steel ring 3-7 are connected to form a combination.

[0044] The central tube 3-3 is connected to the central drill rod 3-1, and all components are connected together to form an inner casing follower; the inner casing follower 3 is connected to the matching drill rod 8 through the central drill rod 3-1 through a threaded connection and lowered into the steel pipe pile 1.

[0045] The center drill rod 3-1, the roller 3-2, the center tube 3-3, the upper and lower baffles 3-4, the wing plate 3-5, the web 3-6 and the annular steel ring 3-7 are all made of stainless steel.

[0046] The top of the center drill rod 3 - 1 is provided with an inverted convex opening, so as to be connected with the matching drill rod 8 through threads and lowered into the steel pipe pile 1 .

[0047] The centralizer 5 includes a centralizer body 51 in an annular shape, a drill hole 54 is located at the center of the centralizer body 51, a connecting rod 53 is arranged on the outer side of the centralizer body 51, and an arc-shaped centralizer block 52 is arranged at the end of the connecting rod 53, and the outer arc of the centralizer block 52 matches the inner arc of the steel pipe pile 1.

[0048] A method for using a hole collapse treatment device for offshore wind power inclined pile embedded in rock construction includes the following steps: when the inclined pile collapses during the drilling process, the drill rig is used to timely raise the drill bit 4, and the steel pipe pile 1 is continuously injected with water to keep the water head inside the steel pipe pile 1 higher than the water head outside the pile as much as possible to prevent the collapse area from further expanding. The processed inner casing is placed inside the steel pipe pile 1, and the drill bit 4 with an inner casing follower is placed down to pump sand and clean the hole. At the same time, under the drive of the drilling rig, the inner casing follower presses the inner casing downward, and the drilling rig applies pressure every time it pumps a part of sand material, pressing down the inner casing, step by step, so as to advance to the sand leakage position, and the inner casing blocks the sand leakage point. When there is no more sand leakage in the steel pipe pile 1, the drill is raised, the position of the follower is changed, and it is moved up to be used as a guide drill rod 8, and drilling is continued to check the plugging effect. If there is still sand leakage in the steel pipe pile 1, the inner casing is continued to be pushed until the plugging is completed.

[0049] A method for processing a collapsed hole in an offshore wind power inclined pile embedded in rock construction comprises the following steps: step 1: using a drilling rig to raise a drill bit; step 2: processing a guide on the side wall of an inner casing; step 3: placing an inner casing in a steel pipe pile 1; step 4: drilling to pump sand and clean the hole, while the inner casing follows up; step 5: re-drilling to check the plugging effect; step 6: drilling, forming holes and pouring.

[0050] A method for processing a collapsed hole in an offshore wind power inclined pile embedded in a rock construction comprises the following steps:

[0051] Step 1: Use a drilling rig to pull out the drill bit: When the rock-embedded section collapses, the weak layer of the hole wall will slide into the hole, and it is mostly in the form of fine sand and strongly weathered loose bodies. The drill bit must be pulled out of the pile as soon as possible to avoid being buried.

[0052] Step 2: Processing and guiding the side wall of the inner casing: To ensure that the inner casing is lowered smoothly to the bottom of the inclined pile, several small holes are opened on the side wall of the inner casing, and several wooden strips are vertically tied to the outside of the inner casing with wire to achieve the guiding purpose. The width and height of the wooden strips are 3-4cm. 12-20mm guide steel bars can also be welded on the outer wall of the inner casing. The length of the guide steel bars should not exceed the length of the inner casing.

[0053] Step 3: Place inner casing inside steel pipe pile 1: Since the inner casing is used for plugging, the steel pipe pile 1 will not be taken out after plugging. When pouring the pile core concrete, in order to make the slurry fill the gap between the inner casing and the steel pipe pile 1, overflow holes need to be opened in advance. The size of the opening should be 50cm high and 5cm wide. The number of openings should be no less than 4, and the position should be 2-3m away from the bottom of the inner casing. After the inner casing is processed, it is placed by a crane.

[0054] Step 4: Drilling, sand extraction and hole cleaning, while inner casing follow-up: After the inner casing is lowered, the drill bit 4 with the inner casing follower is lowered, and the drilling rig extracts sand and cleans the hole while applying pressure. In this way, under the power of the drilling rig, the inner casing follower will drill with the drill rod 8, and then press the inner casing downward until there is no more sand leakage and the inner casing is sealed. This process generally takes 1-4 days to complete.

[0055] Step 5: Re-drill to check the plugging effect: When the inner casing is followed until there is no more sand leakage, the follower can be removed or the follower can be moved up, and the inner casing is no longer pressed down. Re-drill and check whether there is any sand leakage during the process. If there is still sand leakage in the steel pipe pile 1, reinstall the follower and continue to push the inner casing until the plugging is completed.

[0056] Step 6: Drilling, hole forming and pouring: When sand no longer leaks during the re-drilling process, the hole collapse treatment is completed and normal drilling and hole pouring can be carried out. Example 1

[0057] The operation steps of the inner casing follower 3 are as follows:

[0058] Step A, welding and fixing the center drill rod and the upper and lower baffles together, and the rollers are evenly distributed around the center drill rod through the pins to form a combination with the center drill rod;

[0059] Step B, connecting the center tube with the wing plate, the web plate, and the annular steel ring to form an inner casing pressing device, which is divided into two symmetrical parts connected by flanges;

[0060] Step C, connecting the inner casing pressing device through the center tube and the center drill rod, and connecting all components together to form the inner casing follower 3;

[0061] Step D, transport the follow-up device to the sea, connect the center drill rod and the matching drill rod 8 through threads and lower it into the steel pipe pile 1, start the drilling rig, and the central structure of the inner casing follower 3 rotates with the drill bit. The outer annular steel ring is fixed and follows the center drill rod downward to press the inner casing of the anti-collapse hole downward until the inner casing blocks the collapsed hole position. Example 2

[0062] When the inclined pile collapses, the drill rig is used to promptly raise the drill bit 4, and the steel pipe pile 1 is continuously injected with water to keep the water head in the steel pipe pile 1 higher than the sea level as much as possible to form a pressure difference to prevent the collapse area from further expanding. The processed inner casing is placed inside the steel pipe pile 1. The collapse position is generally 1-3 meters from the end of the steel pipe pile 1, and the length of the inner casing is generally 4-6 meters. Drill down and lower the inner casing follower. Here, the placement of the follower needs to be calculated in advance according to the length of the inner casing to ensure that the drill bit is always about 50 cm below the inner casing during the downward pressure of the inner casing. Next, start to pump sand and clean the hole. At the same time, under the drive of the drilling rig, the inner casing follower presses the inner casing downward. During this process, if the sand leakage speed is fast and it is difficult to clean the hole, the drill bit can be raised, the position of the inner casing follower can be appropriately moved down, and a number of dry-mix concrete bags can be thrown outside the pile to continue to clean the hole and press down until the inner casing is pushed to the sand leakage position. The inner casing blocks the sand leakage point. When there is no more sand leakage in the steel pipe pile 1, lift the drill, change the position of the follower, move it up and use it as a guide drill rod 8, continue drilling, and check the plugging effect. If there is still sand leakage in the steel pipe pile 1, continue to push the inner casing until the plugging is completed and normal drilling can be carried out. Example 3

[0063] During a drilling process, a hole collapse occurred when drilling to 45m. The designed hole depth is 47m, the length of steel pipe pile 1 is 38m, and the hole collapse position is 1.2m from the end of steel pipe pile 1. The drill bit has been pulled out of steel pipe pile 1. The method for handling the hole collapse in offshore wind power inclined pile embedded in rock construction is now used for treatment. The specific construction steps are as follows:

[0064] Step 1, guide processing on the side wall of the inner casing 2: open several small holes on the side wall of the inner casing 2, use wire to vertically tie several guide steel bars 6 to the outside of the inner casing 2 to achieve the guiding purpose. The guide steel bars 6 are 4 cm wide and high, 4 m long, the inner casing 2 is 5 m long and 1.9 m in diameter, and 3 overflow holes 7 are opened at 2m and 3m above the bottom of the inner casing 2.

[0065] Step 2, placing inner casing 2 inside steel pipe pile 1: After the guide and overflow hole 7 of inner casing 2 are processed at the dock, they are transported to the construction site and placed at the bottom of steel pipe pile 1 by square barge crane unit, and then divers go underwater to unhook them.

[0066] Step 3, drilling down to pump out sand and clean the hole, while the inner casing 2 follows up: After the inner casing 2 is placed in place, the drill bit 44 with the inner casing follower 3 is lowered, and the drilling rig pumps out sand and cleans the hole. The drilling rig model used here is a GF350 full hydraulic reverse circulation drilling rig. During the hole cleaning process, pressure is applied at the same time to push the inner casing 2 downward to block the sand leakage position.

[0067] Step 4, re-drill to check the plugging effect: When the inner casing is followed until there is no more sand leakage, lift the drill and move the follower 3 up 6m to use as a straightener 5 to ensure the inclination of the hole. Drill again and check whether there is sand leakage during the process. If there is still sand leakage in the steel pipe pile 1, re-install the follower 3 and continue to push the inner casing 2 until the plugging is completed.

[0068] Step 5, drilling, hole forming and pouring: When sand is no longer leaking during the re-drilling process, the hole collapse treatment is completed, and normal drilling and hole pouring are carried out.

[0069] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described above in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0070] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0071] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0072] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A device for processing collapsed holes in offshore wind power inclined pile embedded in rock construction, characterized in that: The invention comprises a steel pipe pile (1), an inner casing (2), an inner casing follower (3) and a centralizer (5); wherein the steel pipe pile (1) is in the shape of a cylinder with two ends open, the inner casing (2) is installed at the bottom of the steel pipe pile (1), the centralizer (5) and the inner casing follower (3) are arranged inside the steel pipe pile (1), a drill rod (8) penetrates and extends into the centralizer (5) and the inner casing follower (3), and a drill bit (4) is installed at the end of the drill rod (8); The diameter of the inner casing follower (3) is 8-10 cm larger than the diameter of the inner casing (2); the inner casing follower (3) drills along with the drill rod (8) under the power of the drilling rig, and then presses the inner casing (2) to move downward; The inner casing follower (3) comprises a central drill rod (3-1), rollers (3-2), a central tube (3-3), upper and lower baffles (3-4), wing plates (3-5), a web (3-6) and an annular steel ring (3-7); wherein the central tube (3-3) in the middle of the central drill rod (3-1) is provided with upper and lower baffles (3-4) at both ends, and the upper and lower baffles (3-4) include an upper baffle and a lower baffle; a plurality of rollers (3-2) are evenly arranged around the central drill rod (3-1), and the top of the roller (3-2) is clamped on the bottom of the upper baffle, and the bottom of the roller (3-2) is clamped on the top of the lower baffle; the plurality of rollers (3-2) and the central drill rod (3-1) form a combined body; An annular steel ring (3-7) is arranged on the outer periphery of the central drill rod (3-1), a plurality of webs (3-6) are arranged on the inner side of the annular steel ring (3-7), the inner ends of the webs (3-6) are mounted on the central drill rod (3-1), and the outer ends of the webs (3-6) are mounted on the inner side of the annular steel ring (3-7); wing plates (3-5) are also arranged on the tops between the spaced webs (3-6); the central tube (3-3), the wing plates (3-5), the webs (3-6), and the annular steel ring (3-7) are connected to form a combined body; The center tube (3-3) is connected to the center drill rod (3-1), and all components are connected together to form an inner casing follower; the inner casing follower (3) is connected to the matching drill rod (8) through the center drill rod (3-1) by threads and lowered into the steel pipe pile (1).

2. The device for processing collapsed holes in offshore wind power inclined pile embedded in rock construction according to claim 1 is characterized by: The side wall of the inner casing (2) is vertically welded with a guide steel bar (6); the guide steel bar (6) has a width of 3 cm, a height of 4 cm, a diameter of 12-20 mm, and a length that does not exceed the length of the inner casing (2).

3. The device for processing collapsed holes in offshore wind power inclined pile embedded in rock construction according to claim 1 is characterized by: The outer wall of the inner casing (2) is provided with overflow holes (7), the overflow holes (7) are 50 cm high, 5 cm wide, and are not less than 4 in number, and the overflow holes (7) are located 2-3 m away from the bottom end of the inner casing (2).

4. The device for processing collapsed holes in offshore wind power inclined pile embedded in rock construction according to claim 1 is characterized by: The top of the central drill rod (3-1) is provided with an inverted convex opening, which is convenient for connecting with the matching drill rod (8) through a threaded connection and lowering into the steel pipe pile (1).

5. The device for processing collapsed holes in offshore wind power inclined pile embedded in rock construction according to claim 1 is characterized by: The centralizer (5) comprises a centralizer body (51) in the shape of an annulus, the center of the centralizer body (51) being a drill hole (54), the outer side of the centralizer body (51) being provided with a connecting rod (53), the end of the connecting rod (53) being provided with an arc-shaped centralizer block (52), the outer arc of the centralizer block (52) being matched with the inner arc of the steel pipe pile (1).

6. A method for using the device for processing collapsed holes in offshore wind power inclined pile embedded in rock construction according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: when the inclined pile collapses during the drilling process, the drill bit (4) is promptly raised by the drilling machine, and water is continuously injected into the steel pipe pile (1) to keep the water head inside the steel pipe pile (1) higher than the water head outside the pile as much as possible to prevent the collapse area from further expanding; the processed inner casing is placed inside the steel pipe pile (1), and the drill bit (4) with the inner casing follower is lowered to pump sand and clean the hole. At the same time, under the drive of the drilling machine, the inner casing follower presses the inner casing downward, and the drilling machine applies pressure every time it pumps a part of sand material, pressing the inner casing downward, step by step, and thus advancing to the sand leakage position, the inner casing blocks the sand leakage point, and when the steel pipe pile (1) no longer leaks sand, the drill is raised, the position of the follower is changed, and it is moved upward to be used as a guide drill rod (8), and drilling is continued to check the plugging effect. If there is still sand leakage inside the steel pipe pile (1), the inner casing is continued to be pushed until the plugging is completed.

7. A method for treating a collapsed hole in an offshore wind power inclined pile embedded in rock construction according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Use a drilling rig to pull out the drill bit (4): When the embedded rock section collapses, the weak layer of the hole wall will slide into the hole, and it is mostly in the form of fine sand and strongly weathered loose bodies. The drill bit must be pulled out of the pile as soon as possible to avoid being buried; Step 2: Inner casing (2) Side wall processing and guiding: To ensure that the inner casing is smoothly lowered to the bottom of the inclined pile, several small holes are opened on the side wall of the inner casing, and several wooden strips are vertically tied to the outside of the inner casing with wire to achieve the purpose of guidance. The width and height of the wooden strips are 3-4 cm, or 12-20 mm guide steel bars are welded on the outer wall of the inner casing. The length of the guide steel bars should not exceed the length of the inner casing; Step 3: placing inner casing inside the steel pipe pile (1): since the inner casing is used for plugging leaks, the steel pipe pile (1) will not be taken out after plugging leaks. When pouring the pile core concrete, in order to allow the slurry to fill the gap between the inner casing and the steel pipe pile (1) tightly, overflow holes need to be opened in advance in the inner casing. The size of the opening should be 50 cm high and 5 cm wide. The number of openings should be no less than 4 and the position should be 2-3 m away from the bottom of the inner casing. After the inner casing is processed, it is placed by a crane. Step 4: Drilling, pumping sand and cleaning the hole, while the inner casing is followed: After the inner casing is lowered, the drill bit (4) with the inner casing follower is lowered, and the drilling rig pumps sand and cleans the hole while applying pressure; in this way, under the power of the drilling rig, the inner casing follower will drill together with the drill rod (8), and then press the inner casing downward until there is no more sand leakage and the inner casing is completely blocked; this process generally takes 1-4 days to complete; Step 5: Re-drill to check the plugging effect: When the inner casing is followed until there is no more sand leakage, remove the follower or move the follower upwards, the inner casing is no longer pressed down, and re-drill to check whether there is any sand leakage. If there is still sand leakage in the steel pipe pile (1), re-install the follower and continue to push the inner casing until the plugging is completed. Step 6: Drilling, hole forming and pouring: When sand no longer leaks during the re-drilling process, the hole collapse treatment is completed and normal drilling and hole pouring can be carried out.

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