A grouting device and method for a pre-pile method jacket grouting section

Abstract

This invention discloses a grouting device and method for the grouting section of a jacket foundation using the pre-piling method in the field of offshore wind power foundation construction technology. The device includes a steel pipe pile and a jacket leg insertion section, an annular plug, a guide pipe assembly, a conductivity sensor assembly, and a grouting component. The jacket leg insertion section is inserted into the steel pipe pile. The annular plug is located at the lower part of the outer periphery of the jacket leg insertion section, forming an annular grouting section between the outer wall of the jacket leg insertion section, the inner wall of the steel pipe pile, and the annular plug. The lower end of the guide pipe assembly is located on the inner wall of the jacket leg insertion section, and the upper end of the guide pipe assembly is connected to a grouting platform. The conductivity sensor assembly is located on the inner wall of the jacket leg insertion section. The grouting component is located at a preset height on the outer wall of the jacket leg insertion section. This invention can monitor the grouting status in real time, perform directional grouting, and verify the grouting effect.

Description

Technical Field

[0001] This invention relates to a grouting device and method for the grouting section of the jacket foundation using the pre-piling method, belonging to the field of offshore wind power foundation construction technology. Background Technology

[0002] In the construction of jacket foundations using the pre-pile method, steel pipe piles are typically driven into the seabed first, and then the jacket foundation pile feet are inserted into the steel pipe piles. Grouting is then applied through the annular gap between the two to form a pile-leg connection. In existing projects, circumferential grouting often employs a single-cavity bottom-up grouting process: a low-level grouting channel is set up at the lower part of the grouting section to allow grout to displace seawater and gas from the annular joint and expel them upwards; a grout return and venting channel is set up at the upper part of the grouting section. Process control is achieved by observing the stable grout return, calculating the injection volume against the theoretical volume, and, when necessary, supplementing with pressure maintenance. To reduce the risk of pipe blockage caused by prolonged high-pressure operation in the low-level channel and to facilitate subsequent grout replenishment and pressure maintenance, some projects also include a high-level grouting channel for phased switching of grout supply.

[0003] However, traditional single-cavity grouting quality control methods still have the following shortcomings:

[0004] 1. Localized cavities or incomplete filling defects are difficult to identify in a timely manner. The stable discharge of grout from the grout return and venting channels does not necessarily mean that the circumferential joint is completely occupied by grout at all heights and in all circumferential directions. Due to factors such as circumferential joint eccentricity, localized air stagnation, venting obstruction caused by shear keys and rough inner wall structures, and changes in flow regime during construction, air pockets, water pockets, or incomplete filling areas can easily form at specific heights or in specific circumferential directions. These defects are often only discovered after the grout has hardened through non-destructive testing, load-bearing capacity deviations, or abnormal service conditions, resulting in a delayed discovery.

[0005] 2. Remedial measures are not precise enough and lack verifiability. When abnormalities occur during grouting, traditional methods often rely on continuing overall grouting, changing pumping parameters, or secondary grouting through drilling afterward. These measures are difficult to implement targeted grouting for local defects with "specific height + specific circumferential orientation," and there is a lack of means to quickly verify the filling effect at the time of construction after remediation, which easily leads to the risk of "hidden cavities still existing after grouting."

[0006] 3. Limited operating windows at sea significantly increase the difficulty of handling issues. Offshore construction is restricted by sea conditions and operating windows. If defects are only identified after hardening, it often leads to difficulties in underwater positioning, high costs of secondary operations, high risks, and even irreparable problems. In severe cases, it can affect the installation progress and structural reliability. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a grouting device and method for the grouting section of the pre-pile method guide frame, which solves the problems that it is difficult to identify or remedy defects such as local cavities or incomplete filling in the grouting section of the pile-leg joint of the pre-pile method guide frame in a timely manner, and the effect is not accurate enough and difficult to verify in real time.

[0008] To achieve the above objectives, the present invention is implemented using the following technical solution.

[0009] In a first aspect, the present invention provides a grouting device for the grouting section of the pre-pile method guide frame, comprising a steel pipe pile and a guide frame leg insertion section, and further comprising: an annular plug, a guide assembly, a conductivity sensor assembly and a grouting component;

[0010] The guide frame leg insertion section is inserted into the steel pipe pile, and the annular plug is located at the lower part of the outer periphery of the guide frame leg insertion section. An annular grouting section is formed between the outer wall of the guide frame leg insertion section, the inner wall of the steel pipe pile, and the annular plug.

[0011] The lower end of the guide tube assembly is set on the inner wall of the guide tube frame leg insertion section, and the upper end of the guide tube assembly is connected to the grouting platform;

[0012] The conductivity sensor group is disposed on the inner wall of the insertion section of the guide frame leg;

[0013] The grouting assembly is positioned at a preset height on the outer wall of the guide frame leg insertion section.

[0014] The above technical solution uses a conductivity sensor array to achieve real-time tracking of grouting height and real-time identification of the circumferential filling status at key heights, enabling the risk of local cavities or incomplete filling to be detected and located in advance during the grouting process; through the grouting component, directional grouting control is centralized on the grouting platform, achieving zoned directional grouting without relying on complex underwater valve control; changes in conductivity signals can be directly used for real-time verification before and after grouting, making the remedial effect verifiable on-site.

[0015] Furthermore, the conduit assembly includes a top grout return and exhaust pipe, a high-level grouting pipe, an emergency grout replenishment pipe, and a low-level grouting pipe. The liquid and air inlet of the top grout return and exhaust pipe is located at the top of the grouting section. The grout outlet of the high-level grouting pipe is located in the upper part of the grouting section below the top grout return and exhaust pipe. The grout outlet of the emergency grout replenishment pipe is located at a preset height in the grouting section. The grout outlet of the low-level grouting pipe is located at the bottom of the grouting section. The top grout return and exhaust pipe, the high-level grouting pipe, and the low-level grouting pipe are all connected to the grouting section.

[0016] The above technical solution enables precise grouting and replenishment at different heights, as well as emergency grouting at preset heights. During grouting, air in the grouting section can be discharged through the top grout return and exhaust pipe to prevent air blockage and ensure stable grout filling. Excess grout can also be discharged through the top grout return and exhaust pipe after grouting is completed, ensuring precise grout filling.

[0017] Furthermore, the grouting assembly includes a grouting distribution ring and several grouting nozzles. The grouting distribution ring is an annular pipe or an annular cavity structure, located at a preset height on the outer wall of the guide frame leg insertion section, and connected to the emergency grouting pipe. The grouting distribution ring is circumferentially provided with several grout outlet channels connected to the grouting nozzles, and the grouting nozzles are connected to the grout outlet channels and the grouting section.

[0018] The above technical solution, through a circumferential grouting structure, achieves directional grouting at specific heights and in specific circumferential orientations, facilitating the filling of local cavities.

[0019] Furthermore, the conductivity sensor group includes several axial conductivity sensors and several circumferential conductivity sensors. The axial conductivity sensors are arranged along the height direction of the grouting section on the inner wall of the guide frame leg insertion section, and the circumferential conductivity sensors are arranged circumferentially at a preset height on the inner wall of the guide frame leg insertion section.

[0020] The above technical solution uses an axial conductivity sensor to characterize the grouting height or the position of the grouting front in real time, and a circumferential conductivity sensor to characterize the state of the circumferential filling medium at a preset height in real time, which is beneficial for the timely identification of local cavities or incomplete filling defects.

[0021] Furthermore, the grouting nozzle is equipped with a one-way valve and a flow-limiting structure. When the circumferential conductivity sensor detects an unfilled area in the circumferential local grout, the grout enters the unfilled area sequentially through the emergency grouting pipe, the grouting distribution ring, and the grouting nozzle.

[0022] The above technical solution helps to reduce crossflow between sections and lowers the risk of pipe condensation and blockage caused by backflow.

[0023] Furthermore, the circumferential conductivity sensor is a segmented circumferential electrode array, and the axial conductivity sensor is a multi-point electrode array.

[0024] The above technical solution facilitates real-time monitoring of grouting height or grouting front position, as well as the status of the circumferential filling medium at the preset height.

[0025] Furthermore, the top grout return and exhaust pipe is connected to the grout return pipe of the grouting platform, and the grout return pipe is equipped with at least one of a valve, a sampling section, or a flushing interface.

[0026] In the above technical solution, the valve is used to control the opening and closing of the return slurry pipe; the sampling section is used to obtain slurry samples to facilitate monitoring the quality of the injected slurry; and the flushing interface is used to flush away the residual slurry in the return slurry pipe to prevent the slurry from solidifying and causing pipe blockage.

[0027] Furthermore, the annular plug is an annular packer or a rubber plug.

[0028] The above technical solution facilitates sealing the lower part of the grouting section and prevents the grout from flowing into the lower non-grouting area.

[0029] Furthermore, the emergency grouting pipe includes several independent pipes, each connected to a different grouting inlet of the grouting distribution ring.

[0030] The above technical solution facilitates directional grouting and filling of local cavities. At the same time, the design of multiple grouting pipes allows grouting pipes in different directions to perform grouting simultaneously, improving the efficiency of grouting.

[0031] Secondly, the present invention provides a grouting method for the grouting section of a pre-piled guide frame, comprising:

[0032] Grouting material is injected into the annular grouting section through the low-level grouting pipe, and gas and seawater are discharged and grout is output through the top grout return and exhaust pipe.

[0033] The grouting height or grouting front position, as well as the circumferential medium filling status at the preset height, are monitored in real time using a conductivity sensor array.

[0034] When the conductivity sensor group indicates that there is a cavity or an incomplete area at the preset height, grout is added multiple times at low flow rate through the emergency grouting pipe, and the signal changes of the conductivity sensor group are checked after each grouting.

[0035] When the conductivity sensor group detects that the circumferential medium filling state at the preset height has changed to stable filling of slurry, and the slurry return from the top slurry return and exhaust pipe is stable, the emergency slurry replenishment ends.

[0036] When the grouting pressure of the low-level grouting pipe rises to the preset threshold, or when there is a decrease in flow and abnormal pressure fluctuation, or when the grouting enters the replenishment and pressure-holding stage after filling, the high-level grouting pipe is used for pressure-holding grouting. When the conductivity sensor group detects that the circumferential medium filling state at the preset height has changed to stable grout filling, and the grout return from the top grouting exhaust pipe is stable, the grouting supply is stopped. When there are signs of poor grout return or blockage in the top grouting exhaust pipe, the grouting is flushed and cleared through the flushing interface of the grouting pipe, or the grouting is temporarily adjusted to be supplied by the high-level grouting pipe.

[0037] The above technical solutions facilitate real-time monitoring of the circumferential filling status of the grouting height and key heights, avoiding local cavities or incomplete grout filling; the emergency grouting pipe can accurately replenish grout, and the conductivity sensor facilitates verification of the grouting results; the high-level grouting pipe is used for grouting supply switching in the later stage of grouting or pressure holding stage, which helps to reduce the risk of blockage of the low-level grouting pipe under high pressure and long-term working conditions and improve the efficiency of later grouting.

[0038] The beneficial effects achieved by this invention are as follows:

[0039] 1. Real-time tracking of grouting height and real-time identification of circumferential filling status at key heights are achieved through a conductivity sensor array, enabling the risk of local cavities or incomplete filling to be detected and located in advance during the grouting process;

[0040] 2. By using the grouting components at the emergency grouting height, the directional grouting control is centralized on the grouting platform, eliminating the need for complex underwater valve control to achieve zoned directional grouting, making it highly applicable to various projects;

[0041] 3. Before and after grouting, the change in conductivity signal can be directly used for real-time verification, so that the remedial effect can be verified on the spot, reducing the risk of hidden defects and rework. Attached Figure Description

[0042] Figure 1 An axial cross-sectional view of the grouting device for the grouting section of the pre-pile method guide frame provided by the present invention.

[0043] Figure 2 A cross-sectional view of the grouting device for the grouting section of the pre-pile method guide frame provided by the present invention.

[0044] Reference numerals: 1. Steel pipe pile; 2. Insertion section of guide frame leg; 3. Annular plug; 41. Top grout return and exhaust pipe; 42. High-level grouting pipe; 43. Emergency grouting pipe; 44. Low-level grouting pipe; 51. Axial conductivity sensor; 52. Circumferential conductivity sensor; 6. Grouting assembly; 61. Grouting distribution ring; 62. Grouting nozzle. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] Example 1: To better understand the present invention, various aspects of the invention will be described in more detail with reference to the accompanying drawings.

[0049] like Figure 1 As shown, the present invention provides a grouting device for the grouting section of the pre-pile method guide frame, comprising:

[0050] In the first aspect, as shown in Title 1, the present invention provides a grouting device for the grouting section of the guide frame in the pre-pile method, including a steel pipe pile 1 and a guide frame leg insertion section 2, and further including: an annular plug 3, a guide assembly, a conductivity sensor assembly and a grouting component 6;

[0051] The guide frame leg insertion section 2 is inserted into the steel pipe pile 1, and the annular plug 3 is disposed at the lower part of the outer periphery of the guide frame leg insertion section 2. An annular grouting section is formed between the outer wall of the guide frame leg insertion section 2, the inner wall of the steel pipe pile 1, and the annular plug 3.

[0052] The lower end of the conduit assembly is located on the inner wall of the conduit frame leg insertion section 2 and extends along the axial direction of the conduit frame leg insertion section 2. The upper end of the conduit assembly is connected to the grouting platform.

[0053] The conductivity sensor group is installed on the inner wall of the insertion section 2 of the guide frame leg to realize real-time tracking of grouting height and real-time identification of the circumferential filling status at key heights;

[0054] The grouting component 6 is positioned at a preset height on the outer wall of the guide frame leg insertion section 2.

[0055] The conduit assembly includes a top grout return and vent pipe 41, a high-level grouting pipe 42, an emergency grout replenishment pipe 43, and a low-level grouting pipe 44. The liquid and air inlet of the top grout return and vent pipe 41 is located at the top of the grouting section. The grout outlet of the high-level grouting pipe 42 is located above the top grout return and vent pipe 41 in the grouting section. The grout outlet of the emergency grout replenishment pipe 43 is located at a preset height in the grouting section. The grout outlet of the low-level grouting pipe 44 is located at the bottom of the grouting section. All are connected to the grouting section to achieve precise grouting and replenishment at different heights, as well as emergency grouting at preset heights. During grouting, air in the grouting section can be discharged through the top grout return and exhaust pipe 41 to prevent air resistance and ensure stable grout filling. When grouting is completed, excess grout can also be discharged through the top grout return and exhaust pipe 41 to ensure precise grout filling. The high-level grouting pipe 42 is used for grout supply switching in the later stage of grouting or pressure holding stage to reduce the risk of blockage of the low-level grouting pipe 44 under high pressure and long-term working conditions and improve the efficiency of later grouting.

[0056] like Figure 2 As shown, the grouting assembly 6 includes a grouting distribution ring 61 and several grouting nozzles 62. The grouting distribution ring 61 is an annular pipe or annular cavity structure, located at a preset height on the outer wall of the guide frame leg insertion section 2, and connected to the emergency grouting pipe 43, so that the grout can enter the annular grouting gap at different circumferential directions at this height, thereby performing directional grouting on the target circumferential area. The number of grouting nozzles 62 is at least 4. The grouting distribution ring 61 is provided with several grout outlet channels connected to the grouting nozzles 62 in the circumference. The grouting nozzles 62 are connected to the grout outlet channels and the grouting section.

[0057] The conductivity sensor group includes several axial conductivity sensors 51 and several circumferential conductivity sensors 52. The axial conductivity sensors 51 are arranged along the height direction of the grouting section on the inner wall of the guide frame leg insertion section 2. The circumferential conductivity sensors 52 are arranged circumferentially at a preset height on the inner wall of the guide frame leg insertion section 2. They are used to characterize the grouting height or the position of the grouting front and the state of the circumferential filling medium at the preset height in real time, which is beneficial for the timely identification of local cavities or incomplete filling defects.

[0058] The grouting nozzle 62 is equipped with a one-way valve and a flow-limiting structure to reduce cross-flow between sections and reduce the risk of pipe condensation and blockage caused by backflow. When the circumferential conductivity sensor 52 detects an unfilled area in the circumferential local grout, the grout enters the unfilled area sequentially through the emergency grouting pipe 43, the grouting distribution ring 61, and the grouting nozzle 62.

[0059] The circumferential conductivity sensor 52 is a segmented circumferential electrode array, with 4 or 8 segments; the axial conductivity sensor 51 is a multi-point electrode array, which facilitates real-time monitoring of the grouting height or the position of the grouting front, as well as the status of the circumferential filling medium at a preset height.

[0060] The top return slurry exhaust pipe 41 is connected to the return slurry pipe of the grouting platform. The return slurry pipe is equipped with at least one of a valve, a sampling section, or a flushing interface, which is beneficial for controlling the opening and closing of the return slurry pipe, obtaining slurry samples, observing the return slurry status, sampling and identifying the slurry properties, and flushing and clearing the return slurry pipe when necessary to prevent the slurry from solidifying and causing pipe blockage.

[0061] The annular plug 3 is an annular packer or a rubber plug, which facilitates sealing the lower part of the grouting section and prevents the grout from flowing into the lower non-grouting area.

[0062] The emergency grouting pipe 43 includes four independent pipes, which are respectively connected to different grouting inlets of the grouting distribution ring 61, facilitating directional grouting and filling local cavities. At the same time, the design of multiple grouting pipes allows grouting pipes in different directions to perform grouting simultaneously, improving the efficiency of grouting.

[0063] Example 2: This example provides a grouting method for the grouting section of the pre-pile method jacket foundation, including:

[0064] Grouting material is injected into the annular grouting section through the low-level grouting pipe 44, and gas and seawater are discharged and grout is output through the top grout return and exhaust pipe 41.

[0065] The grouting height or grouting front position, as well as the circumferential medium filling status at the preset height, are monitored in real time using a conductivity sensor array.

[0066] When the conductivity sensor group indicates that there is a cavity or an incomplete area at the preset height, grout is added multiple times at low flow rate through the emergency grouting pipe 43, and the signal changes of the conductivity sensor group are checked after each grouting.

[0067] When the conductivity sensor group detects that the circumferential medium filling state at the preset height has changed to stable filling of slurry, and the slurry return from the top slurry return and exhaust pipe 41 is stable, the emergency slurry replenishment ends.

[0068] When the grouting pressure of the low-level grouting pipe 44 rises to the preset threshold, or when the flow rate decreases and the pressure fluctuates abnormally, or when the grouting enters the replenishment and pressure-holding stage after filling, the high-level grouting pipe 42 is used for pressure-holding grouting. When the conductivity sensor group detects that the circumferential medium filling state at the preset height has changed to stable grout filling, and the grout return and exhaust pipe 41 at the top is stable, the grouting is stopped. When the top grout return and exhaust pipe 41 shows signs of poor grout return or blockage, the grouting is flushed and cleared through the flushing interface of the grout return pipe, or the grouting is temporarily adjusted to be supplied by the high-level grouting pipe 42.

[0069] Example 3 is based on the same concept as other examples, but the difference is that this example optimizes the arrangement of the grouting nozzle 62 and the sensor monitoring based on Example 1, so as to further improve the directional grouting effect, reduce the risk of crossflow and enhance the identification robustness. It is suitable for offshore operation scenarios with obvious circumferential joint eccentricity, complex inner wall structure or limited construction window.

[0070] Regarding the structure of the grouting nozzle 62, the grouting nozzle 62 adopts a multi-hole distributed grouting form, that is, multiple small holes or slit nozzles are set in each circumferential direction, so that the grout enters the annular grouting gap in a multi-point, low-flow manner, avoiding local scouring or short circuits caused by single-point jets, and reducing the probability of nozzle blockage.

[0071] The grouting nozzle 62 is further equipped with a flow-limiting structure, so that different circumferential orientations can obtain a predictable flow range under similar grouting pressure, thereby improving the controllability of directional grouting; the grouting nozzle 62 can also be equipped with a unidirectional structure to suppress backflow and reduce the risk of grout backflow and solidification blockage in the independent pipeline within the emergency grouting pipe 43.

[0072] In terms of sensor monitoring layout, in addition to arranging 4-segment monitoring units at the emergency grouting height, the circumferential conductivity sensor 52 can further improve the stability of electrode arrangement and anti-interference capability, for example, by using shielded wiring, improving electrode contact stability, or setting isolation gaps between adjacent segments to reduce crosstalk; the axial conductivity sensor 51 can increase the density of measuring points according to the length of the grouting section and construction needs, so that the grouting height or grouting front information is more continuous, thereby improving the ability to identify abnormal grouting rise rate, grouting stagnation or local stagnation phenomena.

[0073] In terms of coordinated response, when the signal from the circumferential conductivity sensor 52 shows local abnormal fluctuations, it can be cross-verified by combining the grouting height change trend fed back by the axial conductivity sensor 51 to reduce the risk of false triggering caused by short-term disturbances and improve the overall stability of the response.

[0074] In terms of construction process, this embodiment still adopts the main process of low-level grouting pipe 44 and top grout return and exhaust pipe 41, and switches to high-level grouting pipe 42 later as needed. When directional grouting is required in a certain circumferential direction, low-flow multiple grouting is preferred, and the stable signal of circumferential conductivity sensor 52 after each grouting is used as the criterion for continuing or ending grouting, thereby ensuring the grouting effect while reducing the risk of blockage of grouting nozzle 62 and circumferential crossflow. When there is a lot of residual grout in the return pipe, the return pipe connected to the top grout return and exhaust pipe 41 can be flushed and cleared on the grouting platform to maintain the smooth return channel and improve the reliability of process acceptance.

[0075] In summary, this invention achieves real-time tracking of grouting height through axial conductivity monitoring and real-time identification of circumferential filling status at key heights through circumferential segmented conductivity monitoring, enabling the early detection and location of risks such as local cavities or incomplete filling during the grouting process. Through a circumferential zoned grouting structure and independent pipelines at emergency grouting heights, directional grouting control is centralized on the grouting platform, eliminating the need for complex underwater valve control and achieving zoned directional grouting, thus demonstrating strong engineering applicability. Real-time verification can be performed using changes in conductivity signals before and after grouting, allowing for on-site verification of remedial effects and reducing the risk of hidden defects and subsequent rework. Without altering established main processes such as low-level grouting and top grout return and venting, it introduces high-level grouting switching and zoned emergency grouting closed-loop treatment, balancing construction habits with new functions and facilitating widespread application.

[0076] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A grouting device for the grouting section of a guide frame in the pre-piling method, comprising a steel pipe pile (1) and a guide frame leg insertion section (2), characterized in that, Also includes: Annular plug (3), conduit assembly, conductivity sensor assembly and grouting assembly (6); The guide frame leg insertion section (2) is inserted into the steel pipe pile (1), and the annular plug (3) is set at the lower part of the outer periphery of the guide frame leg insertion section (2). An annular grouting section is formed between the outer wall of the guide frame leg insertion section (2), the inner wall of the steel pipe pile (1), and the annular plug (3). The lower end of the conduit assembly is set on the inner wall of the conduit frame leg insertion section (2), and the upper end of the conduit assembly is connected to the grouting platform; The conductivity sensor group is disposed on the inner wall of the insertion section (2) of the guide frame leg; The grouting component (6) is positioned at a preset height on the outer wall of the guide frame leg insertion section (2).

2. The grouting device for the grouting section of the pre-pile method guide frame according to claim 1, characterized in that, The conduit assembly includes a top grout return and exhaust pipe (41), a high-level grouting pipe (42), an emergency grout replenishment pipe (43), and a low-level grouting pipe (44). The liquid and air inlet of the top grout return and exhaust pipe (41) is located at the top of the grouting section. The grout outlet of the high-level grouting pipe (42) is located at the upper part of the grouting section below the top grout return and exhaust pipe (41). The grout outlet of the emergency grout replenishment pipe (43) is located at a preset height of the grouting section. The grout outlet of the low-level grouting pipe (44) is located at the bottom of the grouting section. The top grout return and exhaust pipe (41), the high-level grouting pipe (42), and the low-level grouting pipe (44) are all connected to the grouting section.

3. The grouting device for the grouting section of the pre-pile method guide frame according to claim 2, characterized in that, The grouting assembly (6) includes a grouting distribution ring (61) and several grouting nozzles (62). The grouting distribution ring (61) is an annular pipe or an annular cavity structure, which is set at a preset height on the outer wall of the guide frame leg insertion section (2) and is connected to the emergency grouting pipe (43). The grouting distribution ring (61) is provided with several grout outlet channels connected to the grouting nozzles (62) in the circumferential direction. The grouting nozzles (62) are connected to the grout outlet channels and the grouting section.

4. The grouting device for the grouting section of the pre-pile method guide frame according to claim 1, characterized in that, The conductivity sensor group includes several axial conductivity sensors (51) and several circumferential conductivity sensors (52). The axial conductivity sensors (51) are arranged along the height direction of the grouting section on the inner wall of the guide frame leg insertion section (2), and the circumferential conductivity sensors (52) are arranged circumferentially at a preset height on the inner wall of the guide frame leg insertion section (2).

5. The grouting device for the grouting section of the pre-pile method guide frame according to claim 4, characterized in that, The grouting nozzle (62) is equipped with a one-way valve and a flow limiting structure. When the circumferential conductivity sensor (52) detects that there is an unfilled area in the circumferential local grout, the grout enters the unfilled area in sequence through the emergency grouting pipe (43), the grouting distribution ring (61) and the grouting nozzle (62).

6. The grouting device for the grouting section of the pre-pile method guide frame according to claim 4, characterized in that, The circumferential conductivity sensor (52) is a segmented circumferential electrode array, and the axial conductivity sensor (51) is a multi-point electrode array.

7. The grouting device for the grouting section of the pre-pile method guide frame according to claim 2, characterized in that, The top grout return and exhaust pipe (41) is connected to the grout return pipe of the grouting platform, and the grout return pipe is equipped with at least one of a valve, a sampling section, or a flushing interface.

8. The grouting device for the grouting section of the pre-pile method guide frame according to claim 1, characterized in that, The annular plug (3) is an annular packer or a rubber plug.

9. The grouting device for the grouting section of the pre-pile method guide frame according to claim 3, characterized in that, The emergency grouting pipe (43) includes several independent pipes, which are connected to different grouting inlets of the grouting distribution ring (61).

10. A grouting method for the grouting section of a pre-pile method guide frame, based on claim 7, characterized in that, include: Grouting material is injected into the annular grouting section through the low-level grouting pipe (44), and gas and seawater are discharged and returned grout is output through the top return grout exhaust pipe (41). The grouting height or grouting front position, as well as the circumferential medium filling status at the preset height, are monitored in real time using a conductivity sensor array. When the conductivity sensor group indicates that there is a cavity or an unfilled area at the preset height, grout is replenished multiple times at low flow rate through the emergency grouting pipe (43), and the signal change of the conductivity sensor group is checked after each grouting. When the conductivity sensor group detects that the circumferential medium filling state at the preset height has changed to stable filling of slurry, and the slurry return from the top slurry return and exhaust pipe (41) is stable, the emergency slurry replenishment ends; When the grouting pressure of the low-level grouting pipe (44) rises to the preset threshold, or when the flow rate decreases and the pressure fluctuates abnormally, or when the grouting enters the replenishment and pressure-holding stage after filling, the high-level grouting pipe (42) is used for pressure-holding grouting. When the conductivity sensor group detects that the circumferential medium filling state at the preset height has changed to the grout being stably filled, and the grouting return pipe (41) at the top is stable, the grouting supply is stopped. When the grouting return pipe (41) shows signs of poor grouting return or blockage, the grouting is flushed and cleared through the flushing interface of the grouting return pipe, or the grouting is temporarily adjusted to be supplied by the high-level grouting pipe (42).

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