Stacked high-fidelity soil sampling device and method of sampling

Abstract

The application discloses a stacked high-fidelity soil sampling device and a sampling method thereof. The device comprises a sampling tube, which comprises a plurality of sampling single sections. One end of the sampling tube is provided with a sampling head for soil sampling, and the other end of the sampling tube is provided with a connecting head. The sampling single section comprises a cylinder body, a plurality of inner tubes are movably inserted into the inner wall of the cylinder body through a support structure, and the plurality of inner tubes abut along the axial direction of the cylinder body. The sampling head is of a conical structure, and a sampling channel penetrating through the middle part of the sampling head is arranged. The sampling channel abuts and communicates with the inner tubes. The sampling tube comprises a plurality of sampling single sections, and the sampling single section further comprises a plurality of inner tubes. Therefore, the soil sample can be segmented during sampling, and the soil sample is located in each inner tube during sampling. The cross-contamination of the soil sample can be reduced, and high-fidelity soil sampling can be realized.

Description

Technical Field

[0001] This invention relates to the field of geological soil sampling technology, and in particular to a stacked high-fidelity soil sampling device and its sampling method. Background Technology

[0002] During undisturbed soil sampling, the soil structure is easily disturbed, making it difficult to maintain the original state of the sample. Although related sampling devices are constantly developing, existing sampling methods cannot completely avoid mechanical disturbance to the original soil structure, thus affecting the representativeness of the sample and the reliability of the test data. Some undisturbed soil sampling devices use a hydraulic direct-push structure for sampling, such as the flexible sealed soil sediment and bottom mud sampler disclosed in CN222952036U. While this can reduce sampling resistance and sample disturbance, cross-contamination can still occur between different layers when continuously collecting multiple soil samples, affecting the accuracy of the analysis results. Other undisturbed soil sampling devices use a sealed sampling unit structure, such as the soil sampler for preventing sample contamination disclosed in CN223361801U. Although this can seal and protect the sample after sampling, reducing the risk of external contamination, it does not adequately consider the changes in the sample's state during the collection phase, making it difficult to guarantee the original characteristics of the sample. Summary of the Invention

[0003] The purpose of this invention is to provide a stacked high-fidelity soil sampling device and its sampling method. During sampling, the soil sample is segmented, and when the soil sample is removed, cross-contamination between soil layers can be reduced, thereby achieving high-fidelity soil sampling.

[0004] To achieve the above objectives, this application provides a stacked high-fidelity soil sampling device, including a sampling tube comprising several sampling sections. One end of the sampling tube is equipped with a sampling head for soil sampling, and the other end is equipped with a connector. Each sampling section includes a cylinder, and multiple inner tubes are movably inserted into the inner wall of the cylinder through a support structure. The multiple inner tubes abut against each other sequentially along the axial direction of the cylinder. The sampling head has a conical structure, and a through sampling channel is provided in the middle of the sampling head, which abuts against and communicates with the inner tubes.

[0005] The two ends of the cylinder are respectively provided with external threads and internal threads.

[0006] The support structure is equipped with a cutting device at the joint of adjacent inner tubes. The cutting device includes a driving component and a cutting blade. The cutting blade is mounted on the telescopic component of the driving component and is aligned with the joint of the adjacent inner tube. When the telescopic component of the driving component extends or retracts, the cutting blade extends into the joint to cut the soil sample inside the inner tube.

[0007] The support structure has two cutting devices installed at the joint of adjacent inner tubes. The cutting blades of the two cutting devices are arranged opposite each other. When the cutting blades on both sides move towards each other and come closer, the soil sample in the inner tube is cut.

[0008] The cutting blade has limit grooves on its upper and lower sides, and at the end facing the center of the inner tube. A sealing component is glued and installed in the limit groove. When the cutting blade cuts the soil sample, the sealing component simultaneously seals the end of the inner tube.

[0009] The closure includes a semi-circular base plate with a beveled surface at its straight end and an axially extending extension at its arc surface. An inwardly extending flange is located at the end of the extension away from the semi-circular base plate, and both ends of the flange have extending limiting portions. The limiting portions and the beveled surface are located on the same side of the semi-circular base plate. Limiting annular grooves are provided at both ends of the outer wall of the inner tube, and multiple slots are evenly distributed around the inner circumference of each limiting annular groove. The flange is used to engage with the limiting annular groove, and the limiting portions are used to elastically engage with the slots.

[0010] The outer walls of the inner tube are chamfered at both ends.

[0011] The sampling head includes a cone, a sliding sleeve, and a spring. A partition is provided on the upper side inside the cone, and a sliding hole penetrating the cone is provided in the center of the partition. The sliding sleeve is installed in the sliding hole. A limit ring is provided on the outer wall of the sliding sleeve on the lower side of the partition. The spring is fitted on the sliding sleeve, with the upper end of the spring abutting against the limit ring and the lower end abutting against the cone. A sampling channel is formed inside the sliding sleeve.

[0012] A condensation sampling steady-state device is also installed between the cylinder and the inner tube of the sampling section; the condensation sampling steady-state device includes a coil, a container and a circulation pump. The container is fixed on the support structure, the circulation pump is installed on the container, and a coil is installed on the support structure at the position corresponding to each inner tube. The inner tube slides through the coil, and the coils are connected in series. The head end of the coil is connected to the outlet of the circulation pump, the end end of the coil is connected to the container, and the inlet of the circulation pump is connected to the container; the container is used to hold condensate.

[0013] The sampling method using the aforementioned stacked high-fidelity soil sampling device is used to sample soil. The sampling method includes the following steps:

[0014] Step 1: Connect the sampling device to the power head of the sampling drill rig via the connector; Step 2: Stand the sampling device upright and press it down to collect soil samples. The sampling head breaks through the soil layer, and the soil sample enters from the sampling channel and fills the inner tube. Step 3: After sampling is completed, lift the sampling device and then cut the soil sample in the inner tube using the cutting device to achieve low-disturbance separation and segmentation of the soil sample. During cutting, the cutting blades of the two cutting devices at the joint of adjacent inner tubes move towards each other and approach each other. At this time, the sealing member follows the cutting blade and is inserted between the adjacent inner tubes, and the flange is inserted into the limiting ring groove. The limiting part is elastically inserted into the groove, fixing the sealing member to the end of the inner tube. At this time, both ends of the inner tube are sealed by two sealing members, and the outer circumferential wall of the extension is flush with the outer circumferential wall of the inner tube. Afterwards, the cutting blades of the slitting device move away from each other, the cutting blades separate from the sealing member and move away from the inner tube, and the soil samples after being divided are sealed in separate inner tubes. Step 4: After the sampling device is completely removed, separate the sampling tube from the connector and take out the inner tubes of the sampling tube one by one.

[0015] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. The sampling tube of the present invention includes several sampling sections, and each sampling section has multiple inner tubes. Therefore, during sampling, the soil sample can be segmented. When the soil sample is taken out, the soil sample is located in each inner tube, which can reduce cross-contamination of soil layers and achieve high-fidelity soil sampling, thus ensuring the original characteristics of the sample.

[0016] 2. The support structure of the present invention is equipped with a cutting device at the joint of adjacent inner tubes. When the telescopic component of the drive unit extends or retracts, the cutting blade extends into the joint to cut the soil sample inside the inner tube.

[0017] 3. The upper and lower sides of the cutting blade of the present invention are respectively provided with limiting grooves at the end facing the center of the inner tube, and a sealing member is bonded and installed in the limiting groove; when the cutting blade cuts the soil sample, the sealing member simultaneously seals the end of the inner tube.

[0018] 4. When the slitting blade of the present invention extends into the joint between adjacent inner tubes, the inner tubes can be squeezed and slid towards the sliding sleeve, and the spring is compressed, thereby creating a gap between the adjacent inner tubes that meets the thickness of the slitting blade. After the slitting blade moves away from the inner tube, the sliding sleeve moves upward under the action of the spring, causing the adjacent inner tubes to abut against each other, preventing the sealing element from falling off during the removal of the sampling device.

[0019] 5. The present invention cools the inner tube by installing a condensation sampling steady-state device. The temperature of the inner tube mainly comes from the frictional heat generated between the inner tube and the soil. If this heat is not controlled, it will be conducted to the soil sample and affect the original properties of the soil. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention, which has multiple sampling sections.

[0022] Figure 2 This is a schematic diagram of the structure of the present invention, which uses a sampling head mounted at the bottom of a sampling unit.

[0023] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0024] Figure 4 for Figure 2 Perspective view.

[0025] Figure 5 for Figure 2 A schematic diagram of the longitudinal cross-sectional structure.

[0026] Figure 6 This is a schematic diagram of the structure of a single sampling section in this invention.

[0027] Figure 7 This is a perspective view of a single sampling section in this invention.

[0028] Figure 8 This is a schematic diagram of the internal tube of a single sampling section in this invention.

[0029] Figure 9 This is a schematic diagram of the slitting device in this invention.

[0030] Figure 10 This is a schematic diagram of the closure component in this invention.

[0031] Figure 11 This is a schematic diagram of the internal condensation sampling steady-state device of a single sampling section in this invention.

[0032] Figure 12 This is a schematic cross-sectional view of the sampling head in this invention.

[0033] Figure label: Sampling section 100, body 110, external thread 111, internal thread 112, support structure 120, support hole 121, inner tube 130, chamfer 131, limiting ring groove 132, slot 133, slitting device 140, driving component 141, telescopic component 142, slitting blade 143, limiting groove 144, connecting component 145, sealing component 150, semi-circular bottom plate 151, inclined surface 152, extension 153, flange 154, limiting part 155, condensation sampling steady-state device 160, coil 161, container 162, circulation pump 163.

[0034] Sampling head 200, cylindrical sampling channel 201, cone head 210, partition 211, sliding sleeve 220, limiting ring 221, spring 230. Connector 300. Detailed Implementation

[0035] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0036] Regarding the explanation of terminology: In this application, "and / or" is used to describe the relationship between related objects, covering three possible situations: taking "A and / or B" as an example, it can indicate the situation where only A exists, A and B exist simultaneously, or only B exists; the symbol " / " indicates the "or" relationship between related objects, such as "A / B" which refers to A or B.

[0037] Regarding the description of the embodiments: The terms "exemplary" and "for example" appearing in this application are only used to illustrate the technical solutions through specific examples. It should be particularly emphasized that any implementation method or design scheme marked as "exemplary" or "for example" should not be construed as having an advantage over other solutions. Such expressions are only used to present the technical concepts more intuitively.

[0038] Example 1: See Figure 1-7 This invention provides a stacked high-fidelity soil sampling device, including a sampling tube comprising several sampling sections 100. One end of the sampling tube is equipped with a sampling head 200 for soil sampling, and the other end is equipped with a connector 300. Each sampling section 100 includes a cylinder 110, and multiple inner tubes 130 are movably inserted into the inner wall of the cylinder 110 via a support structure 120. The multiple inner tubes 130 abut against each other sequentially along the axial direction of the cylinder 110. The sampling head 200 has a conical structure, and a through sampling channel 201 is provided in the middle of the sampling head 200. The sampling channel 201 abuts against and communicates with the inner tubes 130.

[0039] The sampling tube is used to collect soil samples. The sampling head 200 has a conical structure, which facilitates positioning and penetration into the soil layer. The connector 300 is used to limit the inner tube 130, preventing it from moving axially upwards during sampling. The connector 300 also connects to the power head of the sampling equipment. The connection structure between the connector 300 and the sampling equipment can be adapted to the structure of the power head. When the power head of the sampling equipment presses down on the sampling tube, the tube enters the soil layer, and soil enters the inner tube 130 through the sampling channel 201. If the sampling tube is a single piece, soil samples can only be taken from both ends, leading to cross-contamination between soil samples from different layers and affecting the accuracy of the analysis results. The sampling tube of the present invention includes several sampling sections 100, and each sampling section 100 has multiple inner tubes 130. Therefore, during sampling, the soil sample can be segmented. When the soil sample is taken out, the soil sample is located in each inner tube 130, which can reduce cross-contamination of soil layers and achieve high-fidelity soil sampling, thus ensuring the original characteristics of the sample.

[0040] See Figure 1 When collecting deeper soil samples, the sampling tube consists of three sampling sections 100 installed sequentially. In this embodiment, see... Figure 6 The two ends of the cylinder 110 are respectively provided with external threads 111 and internal threads 112, and multiple cylinders 110 are screwed together in sequence through external threads 111 and internal threads 112.

[0041] See Figure 6 , 7 In this embodiment, the support structure 120 consists of multiple support frames, which are fixedly connected to the interior of the cylinder 110. A support hole 121 is provided in the middle of each support frame, and the inner tube 130 passes through the support hole 121. See specifically... Figure 5 At each end near the inner tube 130, there is a support frame.

[0042] See Figure 1 The sampling tube of the sampling device includes four sampling sections 100, see [link / reference]. Figure 6 Four sampling sections 100 are connected in series via a threaded structure. A connector 300 is threaded at the top of the sampling tube, and a sampling head 200 is threaded at the bottom. See also Figure 4 , 5 Each sampling unit 100 is 2 meters long, and each sampling unit 100 contains 4 inner tubes 130, each inner tube 130 being 0.5 meters long.

[0043] Example 2: Based on Embodiment 1, a cutting device 140 is installed on the support structure 120 at the abutment of adjacent inner tubes 130, and the pattern inside each inner tube 130 is divided by the cutting device 140.

[0044] Specifically, see Figure 2 , 3 4, 9, The slitting device 140 includes a drive member 141 and a slitting blade 143. The slitting blade 143 is mounted on the telescopic component 142 of the drive member 141. The slitting blade 143 is aligned with the joint of the adjacent inner tube 130. When the telescopic component 142 of the drive member 141 extends or retracts, the slitting blade 143 extends into the joint to cut the soil sample inside the inner tube 130.

[0045] See Figure 9 Depending on the specific connection requirements, a connector 145 can also be installed on the telescopic component 142 of the drive component 141, through which the slitting blade 143 can be installed.

[0046] In this embodiment, the drive unit 141 is an electric cylinder, and the slitting blade 143 is a blade with high hardness.

[0047] In this embodiment, see Figure 3 , 9 Two cutting devices 140 are installed on the support structure 120 at the abutment of adjacent inner tubes 130. The cutting blades 143 of the two cutting devices 140 are arranged opposite each other. When the cutting blades 143 on both sides move towards each other and approach each other, the soil sample in the inner tube 130 is cut.

[0048] Example 3: Based on Example 2, see Figure 9 On the upper and lower sides of the cutting blade 143, and at the end facing the center of the inner tube 130, a limiting groove 144 is provided respectively. A sealing member 150 is bonded and installed in the limiting groove 144. When the cutting blade 143 cuts the soil sample, the sealing member 150 simultaneously seals the end of the inner tube 130.

[0049] It should be noted that the limiting groove 144 for installing the closure 150 can be achieved by slotting on the upper and lower sides of the slitting blade 143. After slotting, the slitting blade 143 located at the limiting groove 144 is thinner, which makes it easier to insert into the joint between adjacent inner tubes 130. Alternatively, arc-shaped protrusions can be provided on the upper and lower surfaces of the two slitting blades 143 on the opposite side, so that the upper and lower surfaces on the opposite side form the limiting groove 144.

[0050] In this embodiment, see Figure 10The closure 150 is made of plastic and includes a semi-circular base plate 151. The straight end of the semi-circular base plate 151 has a bevel 152. The arc surface of the semi-circular base plate 151 has an axially extending extension 153. The end of the extension 153 away from the semi-circular base plate 151 has an inwardly extending flange 154. Both ends of the flange 154 have extending limiting portions 155. The limiting portions 155 and the bevel 152 are located on the same side of the semi-circular base plate 151. (See also...) Figure 8 The inner tube 130 has limiting annular grooves 132 at both ends of its outer wall, and multiple slots 133 are evenly distributed around the inner circumference of each limiting annular groove 132. A flange 154 is used to engage with the limiting annular groove 132, and a limiting part 155 is used to elastically engage with the slots 133, fixing the sealing member 150 to the end of the inner tube 130. This seals both ends of the inner tube 130 with two sealing members 150, preventing soil samples from falling out when the inner tube 130 is removed. After the sealing member 150 is fixed to the end of the inner tube 130, the outer circumferential surface of the extension 153 is flush with the outer circumferential surface of the inner tube 130.

[0051] Further, see Figure 8 In order to facilitate the cutting blade 143 to extend into the joint between adjacent inner tubes 130, chamfers 131 are provided at both ends of the outer wall of the inner tube 130.

[0052] Example 4: Based on Example 3, see Figure 12 The sampling head 200 includes a cone head 210, a sliding sleeve 220, and a spring 230. A partition 211 is provided on the upper side of the cone head 210, with a sliding hole penetrating the cone head 210 at its center. The sliding sleeve 220 is installed inside the sliding hole. A limiting ring 221 is provided on the outer wall of the sliding sleeve 220 below the partition 211. The spring 230 is fitted onto the sliding sleeve 220, with its upper end abutting against the limiting ring 221 and its lower end abutting against the cone head 210. A sampling channel 201 is formed inside the sliding sleeve 220. With this structure, when the slitting blade 143 extends into the joint between adjacent inner tubes 130, the inner tubes 130 can slide towards the sliding sleeve 220, compressing the spring 230 and creating a gap between adjacent inner tubes 130 that satisfies the thickness of the slitting blade 143. After the cutting blade 143 moves away from the inner tube 130, the sliding sleeve 220 moves upward under the action of the spring 230, causing the adjacent inner tubes 130 to abut against each other, preventing the closure 150 from falling off during the removal of the sampling device. In order to facilitate connection with the sampling unit 100, the cone 210 is provided with internal threads on the inner wall located on the upper side of the partition 211.

[0053] Example 5: Based on Example 1, 2, 3, or 4, see [link to example]. Figure 4 , 511. A condensing sampling steady-state device 160 is also installed between the cylinder 110 and the inner tube 130 of the sampling section 100. By installing the condensing sampling steady-state device 160, the inner tube 130 is cooled down. The temperature of the inner tube 130 mainly comes from the frictional heat generated between the inner tube 130 and the soil. If this heat is not controlled, it will be conducted to the soil sample and affect the original properties of the soil.

[0054] In this embodiment, see Figure 11 The condensation sampling steady-state device 160 includes coils 161, a container 162, and a circulation pump 163. The container 162 is fixedly mounted on a support structure 120, and the circulation pump 163 is mounted on the container 162. Coils 161 are installed on the support structure 120 at positions corresponding to each inner tube 130. The inner tubes 130 slide through the center of the coils 161, and the coils 161 are connected in series. The head end of each coil 161 is connected to the outlet of the circulation pump 163, and the tail end of each coil 161 is connected to the container 162. The inlet of the circulation pump 163 is connected to the container 162. The container 162 is used to hold condensate, and the circulation pump 163 circulates the condensate through the coils 161. Because the coils 161 and inner tubes 130 are fitted together in a one-to-one correspondence, the inner tubes 130 are cooled. In this embodiment, the container 162 contains a mixture of ice and water.

[0055] Example 6: Based on Examples 3, 4, or 5, this invention also discloses a sampling method using a stacked high-fidelity soil sampling device for soil sampling. The sampling method includes the following steps: Step 1: Connect the sampling device to the power head of the sampling drill rig via connector 300; Step 2: The sampling device is erected and pressed down to collect soil samples. The sampling head 200 breaks through the soil layer, and the soil sample enters from the sampling channel 201 and fills the inner tube 130. Step 3: After sampling is completed, the sampling device is lifted up, and then the soil sample in the inner tube 130 is cut by the cutting device 140 to achieve low-disturbance separation and segmentation of the soil sample. During cutting, the cutting blades 143 of the two cutting devices 140 at the abutment of adjacent inner tubes 130 move toward each other and approach each other. At this time, the sealing member 150 is inserted between the adjacent inner tubes 130 along with the cutting blades 143, and the flange 154 is inserted into the limiting ring groove 132, and the limiting part 155 is elastically inserted into the slot 133, fixing the sealing member 150 to the end of the inner tube 130. At this time, both ends of the inner tube 130 are sealed by two sealing members 150, and the outer circumferential wall of the extension 153 is flush with the outer circumferential wall of the inner tube 130. Afterwards, the cutting blade 143 of the cutting device 140 moves away from each other, and the cutting blade 143 separates from the sealing member 150 and moves away from the inner tube 130. The soil samples after being cut are then sealed in separate inner tubes 130. Step 4: After the sampling device is completely removed, separate the sampling tube from the connector 300 and take out the inner tube 130 inside the sampling tube in sequence.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stacked high-fidelity soil sampling device, comprising sampling tubes, characterized in that: The sampling tube includes several sampling sections (100), one end of which is equipped with a sampling head (200) for soil sampling, and the other end of which is equipped with a connector (300). The sampling section (100) includes a cylindrical body (110), and multiple inner tubes (130) are movably inserted into the inner wall of the cylindrical body (110) through a support structure (120). The multiple inner tubes (130) abut against each other in sequence along the axial direction of the cylindrical body (110). The sampling head (200) has a conical structure and a through sampling channel (201) is provided in the middle of the sampling head (200). The sampling channel (201) abuts against and communicates with the inner tube (130).

2. The stacked high-fidelity soil sampling device according to claim 1, characterized in that: The two ends of the cylinder (110) are respectively provided with external threads (111) and internal threads (112).

3. The stacked high-fidelity soil sampling device according to claim 1, characterized in that: A cutting device (140) is installed on the support structure (120) at the abutment of the adjacent inner tube (130); the cutting device (140) includes a driving member (141) and a cutting blade (143). The cutting blade (143) is installed on the telescopic component (142) of the driving member (141). The cutting blade (143) is aligned with the joint of the adjacent inner tube (130). When the telescopic component (142) of the driving member (141) extends or retracts, the cutting blade (143) extends into the joint to cut the soil sample inside the inner tube (130).

4. The stacked high-fidelity soil sampling device according to claim 3, characterized in that: Two cutting devices (140) are installed on the support structure (120) at the abutment of adjacent inner tubes (130). The cutting blades (143) of the two cutting devices (140) are arranged opposite to each other. When the cutting blades (143) on both sides move towards each other and approach each other, the soil sample in the inner tube (130) is cut.

5. The stacked high-fidelity soil sampling device according to claim 4, characterized in that: On the upper and lower sides of the cutting blade (143) and at one end facing the center of the inner tube (130), a limiting groove (144) is provided respectively. A sealing member (150) is bonded and installed in the limiting groove (144). When the cutting blade (143) cuts the soil sample, the sealing member (150) simultaneously seals the end of the inner tube (130).

6. The stacked high-fidelity soil sampling device according to claim 5, characterized in that: The closure (150) includes a semi-circular bottom plate (151), with a slope (152) at the straight end of the semi-circular bottom plate (151) and an axially extending extension (153) on the arc surface of the semi-circular bottom plate (151). An inwardly extending flange (154) is provided at the end of the extension (153) away from the semi-circular bottom plate (151). An extending limiting part (155) is provided at both ends of the flange (154). The limiting part (155) and the slope (152) are both located on the same side of the semi-circular bottom plate (151). Limiting annular grooves (132) are provided at both ends of the outer wall of the inner tube (130). Multiple slots (133) are evenly distributed around the inner circumference of the limiting annular grooves (132). The flange (154) is used to be inserted into the limiting annular groove (132), and the limiting part (155) is used to be elastically inserted into the slot (133).

7. The stacked high-fidelity soil sampling device according to any one of claims 3 to 6, characterized in that: The inner tube (130) has chamfers (131) at both ends of its outer wall.

8. The stacked high-fidelity soil sampling device according to any one of claims 1 to 6, characterized in that: The sampling head (200) includes a cone head (210), a sliding sleeve (220) and a spring (230). A partition (211) is provided on the upper side inside the cone head (210). A sliding hole penetrating the cone head (210) is provided in the center of the partition (211). The sliding sleeve (220) is installed in the sliding hole. A limit ring (221) is provided on the outer wall of the sliding sleeve (220) on the lower side of the partition (211). The spring (230) is fitted on the sliding sleeve (220). The upper end of the spring (230) abuts against the limit ring (221) and the lower end abuts against the cone head (210). A sampling channel (201) is formed inside the sliding sleeve (220).

9. The stacked high-fidelity soil sampling device according to claim 1, characterized in that: A condensation sampling steady-state device (160) is also installed between the cylinder (110) and the inner tube (130) of the sampling section (100); the condensation sampling steady-state device (160) includes a coil (161), a container (162) and a circulation pump (163). The container (162) is fixed on the support structure (120), and the circulation pump (163) is installed on the container (162). The support structure (120) has a coil (161) installed at the position corresponding to each inner tube (130). The inner tube (130) slides through the coil (161). The coils (161) are connected in series. The head end of the coil (161) is connected to the outlet of the circulation pump (163), and the end end of the coil (161) is connected to the container (162). The inlet of the circulation pump (163) is connected to the container (162). The container (162) is used to hold condensate.

10. A sampling method using the stacked high-fidelity soil sampling device as described in claim 6, used for soil sampling, characterized in that: The sampling method includes the following steps: Step 1: Connect the sampling device to the power head of the sampling drill via connector (300); Step 2: The sampling device is erected and pressed down to collect soil samples. The sampling head (200) breaks through the soil layer, and the soil sample enters from the sampling channel (201) and fills the inner tube (130). Step 3: After sampling is completed, the sampling device is lifted up, and then the soil sample in the inner tube (130) is cut by the cutting device (140) to achieve low-disturbance separation and segmentation of the soil sample. During cutting, the cutting blades (143) of the two cutting devices (140) at the contact point of the adjacent inner tubes (130) move towards each other and approach each other. At this time, the sealing member (150) follows the cutting blade (143) and is inserted between the adjacent inner tubes (130), and the flange (154) is inserted into the limiting ring groove (132), and the limiting part (155) is elastically inserted into the slot (133), fixing the sealing member (150) to the end of the inner tube (130). At this time, both ends of the inner tube (130) are closed by two sealing members (150), and the outer circumferential wall of the extension (153) is flush with the outer circumferential wall of the inner tube (130). Afterwards, the cutting blades (143) of the cutting device (140) move away from each other, and the cutting blades (143) and the sealing member (150) separate and move away from the inner tube (130). The soil samples after being cut are then sealed in separate inner tubes (130). Step 4: After the sampling device is completely removed, separate the sampling tube from the connector (300) and take out the inner tube (130) in the sampling tube one by one.

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