Non-destructive sampling device and construction method thereof

Abstract

The present invention discloses a non-destructive sampling device, comprising: a sampling assembly, which includes a sampling tube, a connecting sleeve, a hollow shaft, a central shaft and a sampling piston, wherein the hollow shaft is provided with a plurality of exhaust holes and a rubber ring; a driving assembly, which includes a lower sealing sleeve, a pressure cylinder, a penetration piston slidingly arranged in the pressure cylinder, an upper sealing sleeve sealed and fixed at the upper end of the pressure cylinder, a high-pressure water pipe connected to the pressure cylinder, a drainage part and a water inlet part; a sleeve assembly, wherein a limiting sleeve is arranged on the outside of the sampling assembly; a positioning assembly, which includes a fixed part and a sliding part, and when the sliding part abuts against the fixed part, the pressure cylinder is positioned in the sleeve assembly; and a suspension assembly fixed to the sliding part. The soil layer samples extracted by this device have a small degree of damage and high construction efficiency, meeting the survey requirements of the first-class offshore engineering level. A non-destructive sampling method is disclosed, which is based on the non-destructive sampling device of the present invention for sampling, and has the beneficial effects of small sample damage and high sampling efficiency.

Description

Technical Field

[0001] The present invention relates to the field of ocean exploration technology, and more particularly to a non-destructive sampling device and a construction method thereof. Background Art

[0002] Offshore wind farm construction requires a detailed understanding of the soil characteristics of each seabed layer within the project area, determining the engineering properties of each layer and determining pile foundation parameters. At first-level offshore engineering site surveys, collecting intact soil samples is an accurate method. In offshore environments, soil sampling is typically performed by drilling a hole and then inserting a casing. While this method is simple, the sampling tool uses an impact method within the casing to extract the sample. However, the sample is often damaged, resulting in low efficiency and limited application in deeper waters.

[0003] Therefore, it is necessary to design a sampling equipment with high construction efficiency, complete sampling, and for use in deeper waters to meet construction requirements. Summary of the Invention

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these objects and other advantages according to the present invention, there is provided a non-destructive sampling device comprising:

[0006] A sampling assembly comprising a sampling tube, a connecting sleeve detachably connected to the sampling tube, a hollow shaft fixed to the upper end of the connecting sleeve, a sampling piston sealingly and slidably inserted into the sampling tube, and a central shaft movably inserted through the hollow shaft, the connecting sleeve, and the sampling tube, wherein the lower end of the central shaft is connected to the sampling piston, and a plurality of exhaust holes are formed on a side wall of the hollow shaft located above the connecting sleeve, and the plurality of exhaust holes are covered with a common rubber ring;

[0007] A drive assembly comprising a lower sealing sleeve sealingly and slidingly sleeved on the hollow shaft, a pressure cylinder sealingly fixed to the lower sealing sleeve, a penetration piston slidingly disposed in the pressure cylinder, an upper sealing sleeve sealingly fixed to the upper end of the pressure cylinder, and a high-pressure water pipe communicating with the top of the pressure cylinder, wherein the penetration piston is fixed to the upper end of the hollow shaft, the lower sealing sleeve is located above the exhaust hole, and the lower sealing sleeve is provided with a drainage portion and a water inlet portion;

[0008] A sleeve assembly, the limiting sleeve of which is arranged outside the sampling assembly;

[0009] a positioning assembly comprising a fixed portion provided on the sleeve assembly and a sliding portion connected to the pressure cylinder, wherein when the sliding portion abuts against the fixed portion, the pressure cylinder is positioned in the sleeve assembly;

[0010] A suspension assembly is fixed to the sliding portion.

[0011] Preferably, the lower diameter of the connecting sleeve is smaller and the upper diameter is larger, the lower transition sleeve of the connecting sleeve is connected to the inside of the hollow shaft and fixed by screws; the upper inner wall of the connecting sleeve has a thread, the outer wall of the lower end of the hollow shaft has a thread, and the upper part of the connecting sleeve is threaded on the outside of the hollow shaft.

[0012] Preferably, the drainage portion includes a drainage channel axially opened on the side wall of the lower sealing sleeve, a drainage valve provided on the drainage channel, and a drainage screw threadedly connected to the outlet of the drainage valve;

[0013] The water inlet portion includes a water inlet channel axially opened on the side wall of the lower sealing sleeve and a water inlet valve arranged on the water inlet channel.

[0014] Preferably, the outer wall of the upper portion of the hollow shaft is provided with a thread, the bottom of the penetration piston is provided with a connecting hole, the side wall of the connecting hole is provided with a thread, and the upper portion of the hollow shaft is threadedly connected to the connecting hole.

[0015] Preferably, the fixing portion is an annular sleeve, and an annular boss is provided on the inner side wall of the annular sleeve protruding radially inwardly;

[0016] The sliding portion includes:

[0017] A sliding sleeve is fixed to the suspension assembly, the sliding sleeve movably passes through the annular sleeve, and a clearance hole is opened on the side wall of the sliding sleeve;

[0018] The sliding sleeve is loosely fitted with the sliding sleeve and movably passes through the sliding sleeve. A waist-shaped groove is provided on the side wall of the sliding sleeve, and a positioning block and a limit screw are provided on the waist-shaped groove in a relative manner. The lower end of the positioning block is hinged in the waist-shaped groove, and the upper end is fixed to the side wall of the waist-shaped groove by a positioning spring. The outer wall of the positioning block is provided with an inclined surface. The size of the positioning block increases from bottom to top, and when the positioning spring is in a normally extended state, the upper end of the positioning block extends outward from the waist-shaped groove and the clearance hole, and the other end of the limit screw extends into the clearance hole; the lower end of the sliding sleeve is fixed to the pressure cylinder;

[0019] When the sliding sleeve moves upward relative to the sliding shaft sleeve to the end point, the lower end of the sliding sleeve presses the positioning block radially inwardly into the waist-shaped groove, and the spring is compressed;

[0020] When the sliding sleeve moves upward to the end point relative to the sliding sleeve, the upper end of the positioning block extends out of the waist-shaped groove and the clearance hole under the elastic force of the positioning spring to restore the deformation, and abuts against the bottom surface of the boss.

[0021] Preferably, the casing assembly comprises a plurality of casings threadedly connected in sequence, the drill bit is threadedly connected to the casing at the bottom, and the annular sleeve is threadedly connected to one of the casings.

[0022] Preferably, the suspension assembly comprises:

[0023] a housing fixedly connected to the sliding sleeve;

[0024] The umbilical cable includes a steel wire rope and a sealing layer for sealing the steel wire rope and the high-pressure water pipe. The lower end of the steel wire rope is fixed to the outer shell. The high-pressure water pipe passes through the positioning assembly and is connected to the pressure cylinder.

[0025] A construction method based on a non-destructive sampling device is provided, comprising the following steps:

[0026] S1. Close the drainage part, inject high-pressure water from the water inlet, move the penetration piston upward, and return the sampling assembly to its initial position to prepare for sampling;

[0027] S2. Hoisting the casing assembly onto the seabed, and then hoisting the sliding portion, the driving assembly, and the sampling assembly from the top of the casing assembly to the seabed via an umbilical cable;

[0028] S3. Open the drainage part, inject high-pressure water into the top of the pressure cylinder through the high-pressure water pipe, and when the sliding part moves upward and abuts against the fixed part, the pressure cylinder is positioned in the casing assembly, and the penetration piston pushes the hollow shaft and the sampling tube downward to penetrate the seabed surface to collect soil samples. During the penetration process, the sampling piston is moved upward by the soil sample. After the penetration is completed, the sliding part, the driving assembly, and the sampling assembly are lifted out of the casing assembly as a whole, and the sampling tube that has completed the sampling is removed, completing the sampling work for that time;

[0029] S4, connecting the casing assembly to the power head of the drilling rig, starting the drilling rig, drilling the casing assembly downward to the predetermined depth, stopping the drilling rig, and reaching a new seabed surface;

[0030] S5. Install a new sampling tube and repeat steps S1 to S4 until all sampling tasks are completed.

[0031] The present invention has at least the following beneficial effects: Traditional sampling is primarily based on the impact method, where a sampler is used within a casing to obtain impact samples through gravity impact. This method has the disadvantages of low impact force, resulting in uneven lengths and sizes of soil samples, and the possibility of sample breakage. The present invention uses high-pressure water as a driving force to penetrate the soil layer, resulting in a high and controllable penetration force. The extracted soil samples are standardized and minimally damaged, surpassing the impact method in terms of sample extraction efficiency. The method is particularly suitable for collecting soil samples at survey sites for first-class offshore engineering projects, significantly shortening the traditionally long construction period.

[0032] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the overall side structure of the non-destructive sampling device according to one of the technical solutions of the present invention;

[0034] Figure 2 A cross-sectional view of the lower portion of the pressure cylinder according to one of the technical solutions of the present invention;

[0035] Figure 3 This is a cross-sectional view of the upper portion of the pressure cylinder according to one of the technical solutions of the present invention;

[0036] Figure 4 A cross-sectional view of the lower portion of the sampling assembly according to one of the technical solutions of the present invention;

[0037] Figure 5 A cross-sectional view of the sleeve assembly according to one of the technical solutions of the present invention;

[0038] Figure 6 A cross-sectional view of the positioning assembly in a released positioning state according to one of the technical solutions of the present invention;

[0039] Figure 7 This is a cross-sectional view of the positioning assembly in the positioning state according to one of the technical solutions of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0041] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] like Figures 1 to 7 As shown, the meanings of the accompanying drawings in the specification of the present invention are as follows: sampling assembly 100, sampling tube 11, hollow shaft 12, connecting sleeve 13, exhaust hole 14, rubber ring 15, central shaft 16, sampling piston 17, driving assembly 200, lower sealing sleeve 21, pressure cylinder 22, penetration piston 23, upper sealing sleeve 24, high-pressure water pipe 25, sleeve assembly 300, positioning assembly 400, fixing part 41, sliding part 42, suspension assembly 500, drain channel 201, drain valve 202, drain screw 203, water inlet channel 204, water inlet valve 205, connecting hole 206, boss 411, sliding sleeve 421, waist-shaped groove 422, sliding shaft sleeve 423, make way hole 424, positioning block 425, positioning spring 426, limit screw 427, sleeve 31, drill bit 32.

[0043] like Figures 1 to 7 As shown, the present invention provides a non-destructive sampling device, comprising:

[0044] The sampling assembly 100 includes a sampling tube 11, a connecting sleeve 13 detachably connected to the sampling tube 11, a hollow shaft 12 fixed to the upper end of the connecting sleeve 13, a sampling piston 17 sealingly and slidingly inserted into the sampling tube 11, and a central shaft 16 movably inserted through the hollow shaft 12, the connecting sleeve 13, and the sampling tube 11, wherein the lower end of the central shaft 16 is connected to the sampling piston 17, and the side wall of the hollow shaft 12 above the connecting sleeve 13 is provided with a plurality of exhaust holes 14, a plurality of exhaust holes 14, and a plurality of exhaust holes 14. The upper cover of the vent 14 is provided with a common rubber ring 15. When the hollow shaft 12 moves downward under the action of an external force, it drives the connecting sleeve 13 and the sampling tube 11 downward, and the sampling tube 11 penetrates downward from the seabed, thereby collecting a seabed soil sample. During the penetration process, the sampling piston 17 located within the sampling tube 11 moves upward from its initial position (flush with the lower end surface of the sampling tube 11) under the pressure of the soil sample until penetration is complete. The central shaft 16, driven by the sampling piston 17, moves axially upward within the hollow shaft 12. This sampling process reduces the mixing of seawater into the soil sample in the sampling tube 11, reduces the mud content in the soil sample, and improves the quality of the collected sample.

[0045] Specifically, the lower diameter of the connecting sleeve 13 is smaller, and the upper diameter is larger. The lower transition sleeve of the connecting sleeve 13 is connected to the inside of the hollow shaft 12 and fixed by screws. The upper inner wall of the connecting sleeve 13 is threaded, and the outer wall of the lower end of the hollow shaft 12 is threaded. The upper part of the connecting sleeve 13 is threaded on the outside of the hollow shaft 12. When the sampling piston 17 moves upward to the end point, it abuts against the lower end of the connecting sleeve 13. After the sampling is completed, the sampling tube 11 can be removed by removing the screws, and then a new sampling tube 11 can be replaced to carry out sampling work on another pile foundation. The sampling tube 11 is made of thin-walled stainless steel tube.

[0046] The drive assembly 200 includes a lower sealing sleeve 21 with a sealing sliding sleeve 421 mounted on the hollow shaft 12, a pressure cylinder 22 sealed and fixed to the lower sealing sleeve 21, a penetration piston 23 slidably mounted within the pressure cylinder 22, an upper sealing sleeve 24 sealed and fixed to the upper end of the pressure cylinder 22, and a high-pressure water pipe 25 connected to the top of the pressure cylinder 22. The penetration piston 23 is fixed to the upper end of the hollow shaft 12, the lower sealing sleeve 21 is located above the exhaust hole 14, and the lower sealing sleeve 21 is provided with a drainage portion and a water inlet portion. When high-pressure water is injected from the high-pressure water pipe 25, it pushes the penetration piston 23 downward within the pressure cylinder 22, thereby driving the hollow shaft 12 upward, and ultimately the hollow shaft 12 and the sampling tube 11 downward. As the penetration piston 23 moves downward, water originally located within the pressure cylinder 22 below the penetration piston 23 is discharged through the drainage portion. After sampling is complete, high-pressure water is injected from the water inlet to reset the penetration piston 23, causing it to move upward within the pressure cylinder 22 to its initial position, preparing for the next sampling operation. Traditional impact sampling methods often result in damage to soil samples, resulting in low efficiency and difficulty in widespread use in deep-sea construction. The present invention uses water as the penetration force for sample collection, replacing the impact method. This allows for complete and accurate soil sample collection and high efficiency.

[0047] Specifically, the drainage section includes a drainage channel 201 axially defined on the sidewall of the lower sealing sleeve 21, a drainage valve 202 disposed on the drainage channel 201, and a drainage screw 203 threadedly connected to the outlet of the drainage valve 202. The water inlet section includes an inlet channel 204 axially defined on the sidewall of the lower sealing sleeve 21 and an inlet valve 205 disposed on the inlet channel 204. The drainage screw 203 is used to seal the outlet of the drainage valve 202. When the drainage screw 203 is removed and unscrewed, the water in the pressure cylinder 22 is discharged through the drainage channel 201 and the drainage valve 202 under the pressure of the penetration piston 23. High-pressure water is injected from the inlet valve 205, enters the pressure cylinder 22 through the inlet channel 204, and pushes the penetration piston 23 upward to reset.

[0048] Specifically, the upper outer wall of the hollow shaft 12 is provided with a thread, the bottom of the penetration piston 23 is provided with a connecting hole 206, the side wall of the connecting hole 206 is provided with a thread, and the upper part of the hollow shaft 12 is threadedly connected to the connecting hole 206. This facilitates the installation and disassembly of the hollow shaft 12. The sleeve assembly 300, whose limiting sleeve is arranged on the outside of the sampling assembly 100; the sleeve assembly 300 is used to form a relatively closed channel between the seawater and the seabed surface for the sampling assembly 100 and the drive assembly 200 to move and position, and to drill downward from the seabed surface to the required depth (the depth to be sampled). The sleeve assembly 300 is a commonly used device in seabed sampling. The main improvement of the present invention is that a positioning assembly 400 is provided in the sleeve assembly 300. The positioning assembly 400 is used to position the sampling assembly 100 and the drive assembly 200 so as to collect soil samples at a preset depth. Specifically, the casing assembly 300 includes multiple casings 31 threadedly connected in sequence. A drill bit 32 is threadedly connected to the bottom casing 31. The length and number of casings 31 are designed based on actual sampling needs. The upper casing 31 is connected to the drilling rig. After the drill bit 32 is fixed to the lower part, the drilling rig is started to perform seabed drilling operations. The drilling rig is shut down after drilling reaches the required depth.

[0049] Specifically, the positioning component 400 can be implemented in the following ways, including:

[0050] The fixing portion 41 is an annular sleeve, and an annular boss 411 is radially inwardly protruded on the inner side wall of the annular sleeve; the boss 411 is used to abut the driving assembly 200 to achieve a positioning function.

[0051] At least one pair of radial linear actuators is provided, with fixed ends secured to the drive assembly 200 and movable ends provided with abutment blocks. When the radial linear actuators are activated to extend their movable ends radially outward, the radial distance between the movable ends of the pair of radial linear actuators is greater than the inner diameter of the boss 411, thereby axially positioning the drive assembly 200. When the radial linear actuators are driven to retract their movable ends radially inward, the radial distance between the movable ends of the pair of radial linear actuators is less than the inner diameter of the boss 411, thereby releasing the axial positioning state of the drive assembly 200. Specifically, the radial linear actuators may be electric cylinders.

[0052] Preferably, the positioning component 400 is implemented in the following manner:

[0053] The positioning assembly 400 includes a fixed portion 41 disposed on the sleeve assembly 300 and a sliding portion 42 connected to the pressure cylinder 22. When the sliding portion 42 abuts the fixed portion 41, the pressure cylinder 22 is positioned within the sleeve assembly 300. The sampling assembly 100 and the drive assembly 200 are lowered from the upper end of the sleeve assembly 300 until the bottom of the sampling tube 11 abuts the seabed surface to be sampled. High-pressure water is injected from the high-pressure water pipe 25. Under the reaction force of the penetration piston 23, the pressure cylinder 22 moves upward, thereby driving the sliding portion 42 upward until the sliding portion 42 abuts the fixed portion 41, thereby positioning the sampling assembly 100. When high-pressure water is continued to be injected from the high-pressure water pipe 25, the pressure cylinder 22 remains in its position, and the penetration piston 23, under the action of the high-pressure water, drives the sampling tube 11 downward to penetrate and sample. The entire process can quickly locate and fix the positions of the sampling component 100 and the driving component 200, and accurately collect soil samples at the target position.

[0054] Specifically, the fixing portion 41 is an annular sleeve that is threadedly connected to one of the sleeves 31. An annular boss 411 is radially inwardly protruded on the inner sidewall of the annular sleeve; the boss 411 is used to abut the sliding portion 42 to achieve positioning.

[0055] The sliding portion 42 includes:

[0056] A sliding sleeve 421 is movable through the annular sleeve. A clearance hole 424 is formed on the side wall of the sliding sleeve 421. The sliding sleeve 421 can move up and down axially within the annular sleeve.

[0057] The sliding sleeve 423 is loosely fitted with the sliding sleeve 421 and moves through the sliding sleeve 421. A waist-shaped groove 422 is provided on the side wall of the sliding sleeve 423, and a positioning block 425 and a limit screw 427 are relatively provided on the waist-shaped groove 422. The lower end of the positioning block 425 is hinged in the waist-shaped groove 422, and the upper end is fixed to the side wall of the waist-shaped groove 422 by a positioning spring 426. The outer wall of the positioning block 425 is provided with an inclined surface. The size of the positioning block 425 increases from bottom to top, and when the positioning spring 426 is in a normal elongated state, the upper end of the positioning block 425 extends outward from the waist-shaped groove 422 and the clearance hole 424, and the other end of the limit screw 427 extends into the clearance hole 424; the lower end of the sliding sleeve 423 is fixed to the pressure cylinder 22; the setting of the limit screw 427 can limit the distance that the sliding sleeve 423 moves upward.

[0058] When the sliding sleeve 421 moves upward to the end point, the lower end of the sliding sleeve 421 presses the positioning block 425 radially inward, and the positioning spring 426 is compressed until the positioning block 425 is received in the kidney-shaped groove 422; that is, when the sliding sleeve 421 is pulled upward, the sliding sleeve 423 will remain in place due to the gravity of the sliding sleeve 423, the pressure cylinder 22, and the sampling assembly 100, causing the sliding sleeve 421 to move upward relative to the sliding sleeve 423. During the upward movement, the positioning block 425 extending into the kidney-shaped groove 422 is forced to rotate inward along the inclined surface under the action of the lower side wall of the kidney-shaped groove 422, thereby being received in the kidney-shaped groove 422, releasing the abutment state between the positioning block 425 and the boss 411. At this time, the entire sampling assembly 100 and the driving assembly 200 can move freely up and down in the sleeve assembly 300.

[0059] When the sliding sleeve 423 moves upward to the end point, the upper end of the positioning block 425 extends out of the waist-shaped groove 422 and the give way hole 424, and abuts against the bottom surface of the boss 411; that is, when the sampling tube 11 abuts the sampling seabed surface, high-pressure water enters from the high-pressure water pipe 25 and pushes the penetration piston 23 downward. Under the abutment of the seabed surface, the sampling tube 11 and the penetration piston 23 remain in their original positions, thereby reacting on the top wall of the pressure cylinder 22, causing the pressure cylinder 22 to move upward, thereby driving the sliding sleeve 423 and the positioning block 425 to move upward. In this process, the upper end of the positioning block 425 gradually breaks away from the restriction of the side wall of the sliding groove and extends into the waist-shaped groove 422, and gradually rotates outward under the elastic force of the positioning spring 426, and finally extends out of the waist-shaped groove 422, continues to move upward until it abuts against the bottom surface of the boss 411, and cannot continue to move upward to achieve positioning.

[0060] The suspension assembly 500 is fixed to the sliding portion 42, specifically, the suspension assembly 500 is fixed to the sliding sleeve 421. Specifically, the suspension assembly 500 includes:

[0061] a housing fixedly connected to the sliding sleeve 421;

[0062] The umbilical cable includes a steel wire rope and a sealing layer that seals the steel wire rope and the high-pressure water pipe 25. The lower end of the steel wire rope is fixed to the housing. The high-pressure water pipe 25 passes through the positioning assembly 400 and communicates with the pressure cylinder 22. The upper end of the umbilical cable is fixed to a winch, which is used to retract and extend the umbilical cable, thereby raising and lowering the housing, sliding portion 42, drive assembly 200, and sampling assembly 100 within the casing assembly 300.

[0063] In the above technical solution, the construction method of the entire device includes the following steps:

[0064] S1. Close the drainage part, inject high-pressure water from the water inlet, move the penetration piston 23 upward, and return the sampling assembly 100 to the initial position to prepare for sampling;

[0065] S2. The casing assembly 300 is hoisted onto the seabed, and the sliding portion 42, the driving assembly 200, and the sampling assembly 100 are hoisted integrally from the top of the casing assembly 300 to the seabed via the umbilical cable;

[0066] S3. Open the drainage portion and inject high-pressure water into the top of the pressure cylinder 22 through the high-pressure water pipe 25. The sliding portion 42 first moves upward to abut against the fixing portion 41, positioning the pressure cylinder 22 in the sleeve assembly 300. Continue to inject high-pressure water. The penetration piston 23 pushes the hollow shaft 12 and the sampling tube 11 downward to penetrate the seabed surface to collect soil samples. The sampling piston 17 is moved upward by the soil sample during the penetration process. After the penetration is completed, the sliding portion 42, the driving assembly 200, and the sampling assembly 100 are lifted out of the sleeve assembly 300 as a whole, and the sampling tube 11 that has completed sampling is removed, completing the sampling work for that time.

[0067] S4, connecting the casing assembly 300 to the power head of the drilling rig, starting the drilling rig, drilling the casing assembly 300 downward to the predetermined depth, stopping the drilling rig, and reaching a new seabed surface;

[0068] S5. Install a new sampling tube 11 and repeat steps S1 to S4 until all sampling tasks are completed.

[0069] During the above construction process, high-pressure water is used as the power to penetrate the soil layer. The penetration force is large and the magnitude of the force can be controlled. The extracted soil samples are standardized and less damaged. The extracted soil samples are better than the impact method and the construction efficiency is high. It is particularly suitable for the collection of soil samples at the survey site of the first-level offshore engineering grade, which significantly shortens the previously long construction period.

[0070] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. Non-destructive sampling device, characterized in that, include: A sampling assembly comprising a sampling tube, a connecting sleeve detachably connected to the sampling tube, a hollow shaft fixed to the upper end of the connecting sleeve, a sampling piston sealingly and slidably inserted into the sampling tube, and a central shaft movably inserted through the hollow shaft, the connecting sleeve, and the sampling tube, wherein the lower end of the central shaft is connected to the sampling piston, and a plurality of exhaust holes are formed on a side wall of the hollow shaft located above the connecting sleeve, and the plurality of exhaust holes are covered with a common rubber ring; A drive assembly comprising a lower sealing sleeve sealingly and slidingly sleeved on the hollow shaft, a pressure cylinder sealingly fixed to the lower sealing sleeve, a penetration piston slidingly disposed in the pressure cylinder, an upper sealing sleeve sealingly fixed to the upper end of the pressure cylinder, and a high-pressure water pipe communicating with the top of the pressure cylinder, wherein the penetration piston is fixed to the upper end of the hollow shaft, the lower sealing sleeve is located above the exhaust hole, and the lower sealing sleeve is provided with a drainage portion and a water inlet portion; A sleeve assembly, the limiting sleeve of which is arranged outside the sampling assembly; a positioning assembly comprising a fixed portion provided on the sleeve assembly and a sliding portion connected to the pressure cylinder, wherein when the sliding portion abuts against the fixed portion, the pressure cylinder is positioned in the sleeve assembly; a suspension assembly fixed to the sliding portion; The fixing portion is an annular sleeve, and an annular boss is provided on the inner side wall of the annular sleeve protruding radially inwardly; The sliding portion includes: A sliding sleeve is fixed to the suspension assembly, the sliding sleeve movably passes through the annular sleeve, and a clearance hole is opened on the side wall of the sliding sleeve; The sliding sleeve is fitted with the sliding sleeve in a clearance and movably passes through the sliding sleeve. A waist-shaped groove is provided on the side wall of the sliding sleeve. A positioning block and a limit screw are provided on the waist-shaped groove. The lower end of the positioning block is hinged in the waist-shaped groove, and the upper end is fixed to the side wall of the waist-shaped groove by a positioning spring. The outer wall of the positioning block is provided with an inclined surface. The size of the positioning block increases from bottom to top. When the positioning spring is in a normal extension state, the upper end of the positioning block extends outward from the waist-shaped groove and the clearance hole, and the other end of the limit screw extends into the clearance hole. The lower end of the sliding sleeve is fixed to the pressure cylinder. When the sliding sleeve moves upward relative to the sliding shaft sleeve to the end point, the lower end of the sliding sleeve presses the positioning block radially inwardly into the waist-shaped groove, and the positioning spring is compressed; When the sliding sleeve moves upward to the end point relative to the sliding sleeve, the upper end of the positioning block extends out of the waist-shaped groove and the clearance hole under the elastic force of the positioning spring to restore the deformation, and abuts against the bottom surface of the boss; The suspension assembly comprises: a housing fixedly connected to the sliding sleeve; The umbilical cable includes a steel wire rope and a sealing layer for sealing the steel wire rope and the high-pressure water pipe. The lower end of the steel wire rope is fixed to the outer shell. The high-pressure water pipe passes through the positioning assembly and is connected to the pressure cylinder.

2. The non-destructive sampling device according to claim 1, characterized in that: The lower diameter of the connecting sleeve is smaller and the upper diameter is larger. The lower transition sleeve of the connecting sleeve is connected to the inside of the hollow shaft and fixed by screws; the upper inner wall of the connecting sleeve has a thread, the outer wall of the lower end of the hollow shaft has a thread, and the upper part of the connecting sleeve is threaded on the outside of the hollow shaft.

3. The non-destructive sampling device according to claim 1, characterized in that: The drainage part includes a drainage channel axially opened on the side wall of the lower sealing sleeve, a drainage valve arranged on the drainage channel, and a drainage screw threadedly connected to the outlet of the drainage valve; The water inlet portion includes a water inlet channel axially opened on the side wall of the lower sealing sleeve and a water inlet valve arranged on the water inlet channel.

4. The non-destructive sampling device according to claim 1, characterized in that: The outer side wall of the upper portion of the hollow shaft is provided with a thread, the bottom of the penetration piston is provided with a connecting hole, the side wall of the connecting hole is provided with a thread, and the upper portion of the hollow shaft is threadedly connected to the connecting hole.

5. The non-destructive sampling device according to claim 1, characterized in that: The casing assembly comprises a plurality of casings which are threadedly connected in sequence, a drill bit is threadedly connected to the casing at the bottom, and the annular sleeve is threadedly connected to one of the casings.

6. The construction method of the non-destructive sampling device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Close the drainage part, inject high-pressure water from the water inlet, move the penetration piston upward, and return the sampling assembly to its initial position to prepare for sampling; S2. Hoisting the casing assembly onto the seabed, and then hoisting the sliding portion, the driving assembly, and the sampling assembly from the top of the casing assembly to the seabed via an umbilical cable; S3. Open the drainage part, inject high-pressure water into the top of the pressure cylinder through the high-pressure water pipe, and when the sliding part moves upward and abuts against the fixed part, the pressure cylinder is positioned in the casing assembly, and the penetration piston pushes the hollow shaft and the sampling tube downward to penetrate the seabed surface to collect soil samples. During the penetration process, the sampling piston is moved upward by the soil sample. After the penetration is completed, the sliding part, the driving assembly, and the sampling assembly are lifted out of the casing assembly as a whole, and the sampling tube that has completed the sampling is removed, completing the sampling work for that time; S4, connecting the casing assembly to the power head of the drilling rig, starting the drilling rig, and drilling the casing assembly downward to a preset depth, then stopping the drilling rig to reach a new seabed surface; S5. Install a new sampling tube and repeat steps S1 to S4 until all sampling tasks are completed.

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