A flexible membrane based geotechnical coring device and method

Abstract

The application discloses a kind of based on soft membrane wrapping's rock-soil body coring device and method, including hollow drill rod, annular control mechanism can be moved along the inside of hollow drill rod axial direction, the inner wall of the front end of hollow drill rod is arranged annular soft membrane storage, the inner wall of rear end is arranged annular card storage, soft membrane storage stores soft membrane, annular card storage stores annular card, one end of soft membrane is stretched out from soft membrane storage and is connected with annular control mechanism, when drilling coring, annular control mechanism moves from the front end of hollow drill rod to rear end, can drive soft membrane to stretch out from soft membrane storage, and be sleeved on the outside of rock core;Annular card is connected with annular card control mechanism, annular card is moved along the drill rod axial direction by annular card control mechanism, so that annular card is fastened on the soft membrane outside rock core.The relative position relationship of each local area in rock core sample is completely retained by soft membrane and annular card to rock core fastening protection, to realize efficient, high-quality rock-soil body coring work.

Description

Technical Field

[0001] This invention relates to the field of engineering geological rock and soil core sampling technology, and in particular to a rock and soil core sampling device and method based on flexible membrane wrapping. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Core sampling of soil and rock within a target engineering area and subsequent research based on the core samples is a common research method for many engineering problems. Current core sampling methods are mostly based on mechanical impact and water-jetting drilling, which cause strong impacts on the soil and rock mass, damaging the physical structure of the target area to some extent. Furthermore, the preservation of core samples in current methods is mostly achieved through solid containers, which involve a lot of vibration and friction during the process, significantly affecting the original physical structure of the core samples. This is especially true for soil and rock masses containing a large amount of loose material, where the success rate of core sampling is low, and it is difficult to maintain the in-situ structural relationship of the core samples, resulting in poor sample integrity and low reliability of research results obtained from such methods. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a rock and soil core sampling device and method based on flexible membrane wrapping. During the core sampling process, a flexible membrane is wrapped around the rock core, and the rock core is secured and protected by a ring clamp, which more completely preserves the relative positional relationship of each local area in the rock core sample, thereby achieving more efficient and higher quality rock and soil core sampling.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Firstly, a core sampling device for rock and soil based on flexible membrane wrapping is proposed, comprising a hollow drill rod, an annular control mechanism that can move along the drill rod axis inside the hollow drill rod, an annular flexible membrane storage chamber on the inner wall of the front end of the hollow drill rod, and an annular card storage chamber on the inner wall of the rear end. The flexible membrane is stored in the flexible membrane storage chamber, and the annular card is stored in the annular card storage chamber. One end of the flexible membrane extends from the flexible membrane storage chamber and is connected to the annular control mechanism. When drilling for core sampling, the annular control mechanism moves from the front end to the rear end of the hollow drill rod, which can drive the flexible membrane to extend from the flexible membrane storage chamber and wrap around the outside of the rock core. The annular card is connected to the annular card control mechanism, which includes a collector and a telescopic plate. One end of the telescopic plate is connected to the annular card, and the other end is connected to the collector. The collector can collect the telescopic plate, and then drive the annular card to move along the drill rod axis through the telescopic plate, so that the annular card is fastened to the flexible membrane on the outside of the rock core.

[0007] Secondly, a coring method based on a flexible membrane-coated soil and rock coring device is proposed, including:

[0008] Core sampling is performed using hollow drill rods;

[0009] During the core sampling process, the ring control mechanism moves from the front end to the rear end of the hollow drill rod, causing the flexible membrane to extend out of the flexible membrane storage chamber and be fitted onto the outside of the core.

[0010] The collector collects the telescopic plate, which then drives the annular clamp to move axially along the drill pipe, thus securing the annular clamp to the flexible membrane on the outside of the core.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. This invention, by setting up a flexible membrane and an annular clip, and by using an annular control mechanism to extend the flexible membrane and an annular clip control mechanism to move the annular clip, enables the flexible membrane to be fitted onto the rock core during core drilling. The annular clip is then used to secure the flexible membrane to the outside of the rock core, thus providing a secure protection for the rock core. This preserves the relative positional relationships of different local areas in the rock core sample more completely, thereby achieving more efficient and higher-quality rock and soil core drilling.

[0013] 2. In this invention, a magnetic marking strip is set on the flexible membrane along the axial direction, and a magnetic probe is set in the ring card control mechanism. The magnetic information of the magnetic marking strip on the flexible membrane is obtained by the magnetic probe, and then the axial movement distance of the flexible membrane is obtained. The collector is controlled according to the distance, so that the ring card is evenly distributed on the flexible membrane on the outside of the rock core along the axis, so as to uniformly protect the rock core.

[0014] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0016] Figure 1 This is a three-dimensional cross-sectional schematic diagram of the device disclosed in Example 1;

[0017] Figure 2 This is a cross-sectional structural diagram of the device disclosed in Example 1;

[0018] Figure 3 This is a schematic diagram of the structure of the annular card storage compartment disclosed in Example 1;

[0019] Figure 4 This is a schematic diagram of the ring card structure disclosed in Example 1;

[0020] Figure 5This is a schematic diagram illustrating the implementation principle of the ring card control mechanism disclosed in Example 1;

[0021] Figure 6 This is a schematic diagram of the ring control mechanism structure disclosed in Example 1;

[0022] Figure 7 This is a schematic diagram showing the relationship between the flexible film and the magnetic marking strip disclosed in Example 1.

[0023] The components include: 1. Hollow drill pipe; 2. Outer casing; 3. Drill bit; 4. Diamond particles; 5. Inner casing; 6. Flexible film reservoir; 7. Flexible film; 7-1. Magnetic marking strip; 8. First ball bearing; 9. Core; 10. Ring clamp reservoir; 10-1. Release port; 10-2. Ring clamp; 10-2-1. Ring clamp mother ring; 10-2-2. Ring clamp daughter ring; 10-2-3. Ball retainer; 10-2-4. Ring clamp ball bearing; 10-3. Ring clamp control mechanism; 10 -3-1, Magnetic recorder; 10-3-2, Microcontroller; 10-3-3, Collector; 10-3-4, Housing; 10-4, Small hole; 10-5, Magnetic probe; 10-6, Telescopic plate; 10-7, Protrusion; 11, Ring control mechanism; 11-1, Guide post; 11-4, Outer surface; 11-7, Sleeve; 11-2, Ring controller; 11-5, Hemispherical end; 11-8, Control rod; 11-3, Fastening groove; 11-6, Telescopic buckle. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any component or element in this invention. They should not be construed as limiting the invention.

[0028] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0029] Example 1

[0030] In this embodiment, a core sampling device for soil and rock masses based on flexible membrane coating is disclosed, such as... Figures 1-7 As shown, the system includes a hollow drill rod 1. Inside the hollow drill rod 1 is a ring-shaped control mechanism 11 that can move along the drill rod's axial direction. An annular flexible membrane storage chamber 6 is located on the inner wall of the front end of the hollow drill rod 1, and an annular card storage chamber 10 is located on the inner wall of the rear end. The flexible membrane storage chamber 6 stores a flexible membrane 7, and the annular card storage chamber 10 stores an annular card 10-2. One end of the flexible membrane 7 extends from the flexible membrane storage chamber 6 and connects to the ring-shaped control mechanism 11. When drilling for core extraction, the ring-shaped control mechanism 11 moves from the front end to the rear end of the hollow drill rod 1, which can drive the flexible membrane 7 to extend from the flexible membrane storage chamber 6. The core is inserted and fitted onto the outside of the core. The annular clip 10-2 is connected to the annular clip control mechanism 10-3, which includes a collector 10-3-3 and a telescopic plate 10-6. One end of the telescopic plate 10-6 is connected to the annular clip 10-2, and the other end is connected to the collector 10-3-3. The collector 10-3-3 can collect the telescopic plate 10-6, and then the telescopic plate 10-6 drives the annular clip 10-2 to move along the drill pipe axis, so that the annular clip 10-2 is fastened to the flexible membrane 7 on the outside of the core.

[0031] like Figure 1 , Figure 2 As shown, the hollow drill rod 1 includes an inner sleeve 5 and an outer sleeve 2. A drill bit 3 is provided at the front end of the outer sleeve 2. The inner sleeve 5 is a hollow structure, fitted inside the outer sleeve 2, and can rotate relative to the outer sleeve 2.

[0032] To improve the efficiency of core drilling, diamond particles 4 are placed on the drill bit 3.

[0033] To ensure the smooth rotation of the outer sleeve 2 relative to the inner sleeve 5, a guide groove is opened on the inner wall of the outer sleeve 2, and a first ball bearing 8 is set in the guide groove. When the inner sleeve 5 is fitted onto the inner wall of the outer sleeve 2, the outer wall of the inner sleeve 5 contacts the first ball bearing 8, thereby ensuring the smooth rotation of the outer sleeve 2 relative to the inner sleeve 5.

[0034] In this embodiment, the front end is the end closer to the drill bit, and the rear end is the end opposite to the front end and farther away from the drill bit.

[0035] like Figure 7 As shown, the flexible membrane 7 is cylindrical when fully unfolded. Its main physical properties are: impermeable to water, translucent to light, tough, and does not produce ductile deformation. A magnetic marking strip 7-1 is set on the flexible membrane 7, which records the position information of the flexible membrane 7 in the axial direction.

[0036] The flexible membrane storage chamber 6 is located on the inner wall at the front end of the inner sleeve 5 and is used to store the flexible membrane 7. The flexible membrane 7 is densely stacked in the flexible membrane storage chamber 6.

[0037] The flexible membrane storage chamber 6 has an end outlet near the front end of the drill pipe. One end of the flexible membrane 7 extends out of the flexible membrane storage chamber 6 from the end outlet and is connected to the ring control mechanism 11.

[0038] The annular card storage chamber 10 is located on the inner wall of the rear end of the inner casing 5 and is used to store the annular card 10-2. The annular card storage chamber 10 is provided with a release port 10-1. The annular card storage chamber 10 can release the annular card 10-2 through the release port 10-1, so that the annular card 10-2 can be fastened to the flexible membrane 7 on the outside of the core.

[0039] like Figure 4 As shown, the annular clip 10-2 has an overall annular structure, including an annular clip elastic support. Multiple ball retainers 10-2-3 are provided on the annular clip elastic support, and annular clip balls 10-2-4 are provided inside the ball retainers 10-2-3. The annular clip elastic support includes multiple annular clip mother rings 10-2-1 and multiple annular clip daughter rings 10-2-3. Both ends of each ball retainer 10-2-3 are connected to the annular clip mother ring 10-2-1. The annular clip mother ring 10-2-1 has a hollow structure. The annular clip daughter ring 10-2-3 is located between two annular clip mother rings 10-2-1, and both ends of the annular clip daughter ring 10-2-3 are located inside the hollow structure of the two annular clip mother rings 10-2-3 respectively.

[0040] Both the annular mother ring 10-2-1 and the annular daughter ring 10-2-2 are made of arc-shaped elastic material. When no external force is applied, the annular mother ring 10-2 will contract in the radial direction. When the annular mother ring 10-2-2 contracts radially, the annular daughter ring 10-2-2 will move into the hollow structure of the annular mother ring 10-2-1.

[0041] The ball retainer 10-2-3 has openings at both ends in the radial vertical plane of the ring 10-2. The upper and lower ends of the ring 10-2-4 can be exposed through the openings at both ends of the ring 10-2. By setting the ring 10-2-4, the resistance of the ring 10-2 moving along the drill pipe axis can be reduced, so that the ring 10-2 can be released smoothly from the ring 10-2 storage.

[0042] Preferably, the ball retainers 10-2-3 are evenly distributed on the annular elastic support.

[0043] To provide more comprehensive protection for the rock core, multiple annular clips are installed in the annular clip storage chamber 10, and these annular clips are arranged along the drill pipe axis.

[0044] like Figure 5 As shown, the ring card control mechanism 10-3 includes a collector 10-3-3 and a telescopic piece 10-6. One end of the telescopic piece 10-6 is connected to the collector 10-3-3, and the collector 10-3-3 can collect the telescopic piece 10-6.

[0045] Multiple protrusions 10-7 are provided at the other end of the telescopic plate 10-6. The protrusions 10-7 are located between adjacent annular clips. When the collector 10-3-3 collects the telescopic plate 10-6, the annular clips are moved along the drill pipe axis by the protrusions 10-7.

[0046] To ensure that the ring clip can be evenly fastened to the flexible membrane 7 on the outside of the core, the ring clip control mechanism 10-3 is also equipped with a magnetic probe 10-5 and a controller. The magnetic probe 10-5 is used to obtain the magnetic information of the magnetic marking strip on the flexible membrane 7, and the controller is used to control the collector to collect the telescopic sheet according to the magnetic information obtained by the magnetic probe.

[0047] The process of the controller controlling the start and stop of the collector's movement is as follows:

[0048] The controller determines the movement of the flexible membrane material 7 wrapped around the rock core 9 based on the magnetic information, that is, the axial displacement distance between the rock core 9 and the flexible membrane material 7. When the distance reaches the preset spacing between two adjacent ring cards 10-2, the controller starts the collector to collect the telescopic piece. After the telescopic piece is collected to a set length, the ring card is fastened to the flexible membrane 7 on the outside of the rock core.

[0049] The controller includes a magnetic recorder 10-3-1 and a microcontroller 10-3-2 connected to each other. The magnetic recorder 10-3-1 is connected to a magnetic probe 10-5. The magnetic information acquired by the magnetic probe 10-5 is transmitted to the microcontroller 10-3-2 through the magnetic recorder 10-3-1. The microcontroller 10-3-2 is connected to the collector and is used to control the start and stop of the collector according to the magnetic information.

[0050] Preferred, such as Figure 3 As shown, the ring card control mechanism 10-3 is installed in the ring card storage compartment 10, and the magnetic core probe 10-5 extends out from the ring card storage compartment 10.

[0051] Preferably, the ring card control mechanism 10-3 and the ring card are located at opposite ends of the release port 10-1 of the ring card storage chamber 10, with the ring card located at the end closer to the flexible membrane storage chamber.

[0052] like Figure 6 As shown, a guide post 11-1 is provided on the outer surface of the ring control mechanism, and a sliding groove that mates with the guide post 11-1 is provided on the inner wall of the hollow drill rod. The guide post and the sliding groove are connected and the guide post can move along the axial direction of the sliding groove, so that the ring control mechanism can only move along the axial direction of the drill rod and cannot rotate.

[0053] Specifically, the ring control mechanism includes a ring controller 11-2 and a pre-alignment post. A pre-alignment groove is provided on one end face of the ring controller 11. One end of the pre-alignment post is installed in the pre-alignment groove, and the other end extends out of the pre-alignment groove. A fastening groove 11-3 is provided on the inner wall of the pre-alignment groove.

[0054] The ring controller 11-2 is connected to the flexible membrane 7. When the ring control mechanism moves along the drill pipe axis, it drives the flexible membrane 7 to extend or collect.

[0055] Preferably, there are multiple fastening grooves 11-3, which are evenly distributed along the inner wall of the pre-reserved groove, and the fastening grooves are annular grooves.

[0056] The end of the pre-alignment post extending out of the pre-alignment groove is designed as a hemispherical end 11-5, which facilitates connection with the auxiliary mechanism.

[0057] The device disclosed in this embodiment is also provided with an auxiliary mechanism, which includes a telescopic buckle 11-6, a sleeve 11-7 and a control rod 11-8. One end of the sleeve 11-7 is provided with a guide hole, and the other end is connected to the control rod 11-8. The telescopic buckle 11-6 is provided on the outer surface of the sleeve 11-7. The sleeve is used to extend into the pre-alignment groove, the guide hole is used to fit around the outside of the pre-alignment post, and the telescopic buckle is used to fasten in the fastening groove.

[0058] The outer diameter of the sleeve 11-7 corresponds to the minimum inner diameter of the pre-aligned groove, allowing the sleeve 11-7 to extend into the pre-aligned groove.

[0059] The telescopic buckle 11-6 is a one-way telescopic structure. The telescopic buckle is used in conjunction with the fastening groove in the pre-aligned groove to prevent the sleeve from falling out of the pre-aligned groove.

[0060] To accommodate multiple fastening slots, multiple telescopic buckles are installed, and the positions of the multiple telescopic buckles correspond one-to-one with the positions of the fastening slots.

[0061] The steps for core sampling using the device disclosed in this embodiment are as follows:

[0062] Step 1: Core Sampling Device Installation: After determining the core sampling location, install the core sampling device on the drilling rig. The drilling rig's power unit and the outer casing 2 are mechanically connected, driving the rotation of the outer casing during drilling. The inner casing 5 is circumferentially fixed and can move axially relative to the drilling rig body with the outer casing, but cannot move circumferentially. Auxiliary connection mechanisms between the core sampling device and the drilling rig can be designed specifically for different drilling rig models and characteristics. It is important to note that, depending on different core sampling requirements and engineering environment characteristics, a flexible membrane 7 of a specific length is pre-installed in the flexible membrane storage chamber 6 before installation, and a specific size and number of annular clips 10-2 are pre-installed in the annular clip storage chamber 10. The release step distance of the annular clips 10-2 is pre-set in the microcontroller 10-3-2. During installation, ensure that the annular control mechanism 11 is at the end of the device closest to the rock mass.

[0063] Step Two: Core Drilling: After the core sampling device is installed on the drilling rig, the drilling rig is started. The drilling rig's power unit drives the outer casing 2 to rotate, and the outer casing 2 drives the drill bit 3 to rotate. The drill bit 3 squeezes and destroys the rock mass structure around the core 9, thereby separating the core 9 from the rock mass structure. As the core sampling device drills, the inner casing 5 of the core sampling device applies a pushing force to the flexible membrane 7 connected to the annular control mechanism 11, pushing the flexible membrane 7 to move towards the rear end of the core sampling device. At the same time, the densely stacked flexible membrane 7 in the flexible membrane storage chamber 6 is gradually stretched out under tension, covering the outside of the core 9 that has entered the inner casing 5. On the one hand, this avoids mechanical contact between the core 9 and the inner wall of the inner casing 5. On the other hand, it also covers the core 9, maintaining the relative positional relationship between the various parts of the core 9 to the greatest extent and avoiding the impact of vibration, friction, etc. on the core structure. During drilling, the magnetic probe 10-5 reads the magnetic data of the magnetic marking strip 7-1 on the flexible membrane 7 in real time, thereby determining the length of the rock core 9 entering the inner casing 5. When its length reaches the preset spacing of the annular clips 10-2, the microcontroller 10-3-2 sends a running command to the collector 10-3-3. The collector 10-3-3 drives the telescopic plate 10-6 to move, which in turn drives the protrusion 10-7 on the telescopic plate 10-6 to move. The annular clips 10-2 are released from the annular clip storage 10 through the release port 10-1. After the annular clips 10-2 are released, they retract and fasten to the flexible membrane 7 material on the outside of the rock core 9, providing further protection for the rock core.

[0064] Step 3: Sample Retrieval: When the core 9 inside the inner casing 5 reaches the predetermined core length, the power unit of the drilling rig is reversed, driving the outer casing 2 to reverse, and the core sampling device is slowly withdrawn from the rock mass. The control lever 11-8 is operated to make the ring controller 11-2 engage with the sleeve 11-7, and the telescopic buckle 11-6 and the fastening groove 11-3 interact to make them connect and secure. Thus, the ring control mechanism 11 is controlled by the control lever 11-8 to remove the core 9 covered with the flexible membrane 7. At this point, the entire core sampling operation is completed.

[0065] The rock and soil core sampling device disclosed in this embodiment is equipped with an inner casing and an outer casing fitted outside the inner casing. The inner and outer casings are matched and arranged by a first ball bearing arranged in the guide groove, which can keep the inner casing stable during drilling. The method of using a flexible membrane and a ring clamp to achieve wrapping during drilling can better protect the rock core and avoid structural damage to the rock core during the core sampling process. It is easy to disassemble and install, highly practical, and easy to promote and use.

[0066] In this embodiment, the inner sleeve is equipped with a flexible membrane storage chamber and an annular card storage chamber. The end of the flexible membrane material is connected to the annular control mechanism, and the annular card is connected to the annular card controller through a telescopic piece. The annular card controller can control the annular card to fasten the rock core covered with the flexible membrane material at a preset interval, and avoid mechanical contact between the rock core and the inner wall of the inner sleeve, so as to better protect the rock core sample. The structure is simple and the design is ingenious.

[0067] The annular card body disclosed in this embodiment has an annular structure. The annular card is provided with a ball retainer and annular card balls arranged circumferentially. The annular card balls are installed inside the ball retainer. The ball retainer is a hollow structure with openings at both ends in the radial vertical plane of the annular card. The upper and lower ends of the annular card balls can be exposed through the openings at both ends of the annular card. The ball retainer and the annular card balls are connected by an annular card mother ring and an annular card daughter ring. Both the annular card mother ring and the annular card daughter ring are made of arc-shaped elastic material. They will contract in the radial direction of the annular card when no external force is applied. The annular card mother ring is a hollow structure. One end of the annular card mother ring is connected to the ball retainer, and the other end is connected to the annular card daughter ring. Both ends of the annular card daughter ring are located inside the annular card mother ring. When the annular card contracts radially, the annular card daughter ring will move into the annular card mother ring. Through the release and contraction of the annular card, the flexible membrane material outside the core sample can be fastened, which can better protect the integrity of the sample structure during the core extraction process.

[0068] Example 2

[0069] In this embodiment, a coring method for a rock and soil coring device based on a flexible membrane-coated structure as disclosed in Embodiment 1 is disclosed, comprising:

[0070] Core sampling is performed using hollow drill rods;

[0071] During the core sampling process, the ring control mechanism moves from the front end to the rear end of the hollow drill rod, causing the flexible membrane to extend out of the flexible membrane storage chamber and fit over the outside of the core.

[0072] The collector collects the telescopic plate, which then drives the annular clamp to move axially along the drill pipe, thus securing the annular clamp to the flexible membrane on the outside of the core.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A core sampling device for soil and rock masses based on flexible membrane coating, characterized in that, The system includes a hollow drill rod with an annular control mechanism inside that can move along the drill rod's axial direction. An annular flexible membrane storage chamber is located on the inner wall of the front end of the hollow drill rod, and an annular card storage chamber is located on the inner wall of the rear end. The flexible membrane storage chamber stores a flexible membrane, and the annular card storage chamber stores an annular card. One end of the flexible membrane extends from the flexible membrane storage chamber and connects to the annular control mechanism. When core drilling is performed, the annular control mechanism moves from the front end to the rear end of the hollow drill rod, causing the flexible membrane to extend from the flexible membrane storage chamber and fit over the outside of the core. The annular card is connected to the annular card control mechanism, which includes a collector and a telescopic plate. One end of the telescopic plate connects to the annular card, and the other end connects to the collector. The collector collects the telescopic plate, which in turn causes the annular card to move along the drill rod's axial direction, thus securing the annular card to the flexible membrane on the outside of the core. There are multiple annular clips, which are arranged along the drill pipe axis. The telescopic plate is provided with multiple protrusions, which are located between adjacent annular clips. A magnetic marking strip is set along the axial direction on the flexible membrane; the ring card control mechanism also includes a magnetic probe and a controller. The magnetic probe and the collector are both connected to the controller. The magnetic probe is used to obtain the magnetic information of the magnetic marking strip on the flexible membrane. The controller is used to obtain the axial movement distance of the flexible membrane based on the magnetic information. When the distance reaches the spacing between two adjacent ring cards, the collector is controlled to collect the shrinkage sheet. When the ring card is fastened to the flexible membrane on the outside of the rock core, the collector stops working.

2. The rock and soil coring device based on flexible membrane coating as described in claim 1, characterized in that, The hollow drill pipe includes an inner sleeve and an outer sleeve. The drill bit is installed at the front end of the outer sleeve. The inner sleeve is a hollow structure that fits inside the outer sleeve and can rotate relative to the outer sleeve.

3. The rock and soil coring device based on flexible membrane coating as described in claim 1, characterized in that, The ring-shaped card includes a ring-shaped card elastic support, on which multiple ball retainers are provided, and ring-shaped card balls are provided inside the ball retainers.

4. The rock and soil coring device based on flexible membrane coating as described in claim 1, characterized in that, The outer surface of the ring control mechanism is provided with guide posts, and the inner wall of the hollow drill rod is provided with a sliding groove that cooperates with the guide posts. The guide posts and the sliding grooves are connected and the guide posts can move along the axial direction of the sliding grooves.

5. A rock and soil core sampling device based on flexible membrane coating as described in claim 1, characterized in that, The ring control mechanism includes a ring controller and a pre-alignment column. A pre-alignment groove is provided on one end face of the ring controller. One end of the pre-alignment column is installed in the pre-alignment groove, and the other end extends out of the pre-alignment groove. A fastening groove is provided on the inner wall of the pre-alignment groove.

6. A rock and soil coring device based on flexible membrane coating as described in claim 5, characterized in that, It also includes an auxiliary mechanism, which includes a telescopic buckle, a sleeve, and a control rod. One end of the sleeve has a guide hole, and the other end is connected to the control rod. The outer surface of the sleeve is provided with a telescopic buckle. The sleeve is used to extend into the pre-alignment groove, the guide hole is used to fit around the outside of the pre-alignment post, and the telescopic buckle is used to fasten in the fastening groove.

7. A coring method for a rock and soil coring device based on a flexible membrane coating as described in any one of claims 1-6, characterized in that, include: Core sampling is performed using hollow drill rods; During the core sampling process, the ring control mechanism moves from the front end to the rear end of the hollow drill rod, causing the flexible membrane to extend out of the flexible membrane storage chamber and fit over the outside of the core. The collector collects the telescopic plate, and then the telescopic plate drives the annular clamp to move along the drill pipe axis, so that the annular clamp is fastened to the flexible membrane on the outside of the core. The core displacement distance is determined based on magnetic information. When the preset spacing is reached, the collector is driven to release the ring card in segments.

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