Double-layer soil sampling barrel and undisturbed soil sampler

Abstract

The invention relates to the technical field of soil sampling devices, and provides a double-layer soil sampling barrel and an undisturbed soil sampler. The two arc-shaped outer barrels are arranged on the inner barrel in a sleeving manner, and a gap is formed between the edges of the two arc-shaped outer barrels; the two ends of the elastic connecting piece are connected with the two arc-shaped outer barrels respectively, the elastic connecting piece is located in the gap, the elastic connecting piece provides force for enabling the two arc-shaped outer barrels to be close to each other and abut against the outer wall of the inner barrel, and the elastic connecting piece is used for driving the two arc-shaped outer barrels to be closed and eliminating the gap after the inner barrel is pulled out; and the threaded connection part is used for being in threaded connection with the power ring part or being in threaded connection with other inner barrels through the connecting ring. By means of the technical scheme, the problems that in the prior art, a soil sampling cylinder of a double-layer structure is poor in quick-release connection attribute, and the outer cylinder is difficult to pull out subsequently are solved.

Description

Technical Field

[0001] The invention relates to the technical field of soil extractors, and in particular to a double-layer soil extractor and an original soil extractor. Background Art

[0002] Land resources refer to land that has been used by humans and can be used by humans in the foreseeable future. In the process of exploring land resources, it is necessary to sample the original soil, which means that dozens of points on the same piece of land need to be sampled and analyzed in order to conduct a comprehensive analysis of the land. The workload is large, so drilling soil samplers are usually used to collect representative original soil samples to ensure that the data is true and reliable.

[0003] After the traditional drilling soil extractor drives the soil extractor tube into the ground, it is necessary to pull out the soil extractor tube and take out the original soil. However, this step has the following problems: The traditional soil sampling barrel has a single-layer structure, and its extraction requires the cooperation of a lever support frame and a special clamping tool. In the process, the operator needs to repeatedly adjust the position of the special clamping tool in order to more effectively extract the soil sampling barrel with the help of the lever principle. Currently, there are also double-layer soil sampling barrels. Although it is convenient to pull out the inner barrel and take the original soil, the structure is complicated and not as fast to disassemble and connect as the single-layer structure. After the inner barrel is pulled out, the outer barrel is still tightly fitted with the soil, which is not convenient to pull out. Auxiliary tools are also needed, which greatly increases the difficulty and time cost of on-site operations. Summary of the invention

[0004] The present invention proposes a double-layer soil sampling tube and an original soil sampling device, which solve the problems in the related art that the double-layer soil sampling tube has poor quick-release connection properties and the outer tube is difficult to be pulled out later.

[0005] The technical solution of the present invention is as follows: The double-layer soil sampling tube is used to be installed on the power ring of the soil sampling device and inserted into the soil, including: An inner cylinder, wherein both ends of the inner cylinder have threaded connection parts; Two arc-shaped outer cylinders, both of which are sleeved on the inner cylinder, with a gap formed between the edges of the two arc-shaped outer cylinders; An elastic connector, the two ends of which are respectively connected to the two arc-shaped outer cylinders and are located in the gap. The elastic connector provides a force for the two arc-shaped outer cylinders to approach each other and press against the outer wall of the inner cylinder. The elastic connector is used to drive the two arc-shaped outer cylinders to close and eliminate the gap after the inner cylinder is pulled out; A connecting ring, wherein the threaded connection portion is used to be threadedly connected to the power ring portion, or to be threadedly connected to the rest of the inner tube through the connecting ring.

[0006] As a further technical solution, the inner cylinder and the arc-shaped outer cylinder are of equal length, and both ends of the arc-shaped outer cylinder have force-bearing surfaces.

[0007] As a further technical solution, the diameter of the threaded connection part is smaller than the diameter of the inner cylinder, the diameter of the connecting ring is equal to the diameter of the inner cylinder, and the threaded connection part is used to be threadedly connected to the inner wall of the power ring part, or to the inner wall of the connecting ring.

[0008] As a further technical solution, the two arc-shaped outer cylinders are symmetrically sleeved on the inner cylinder, there are a plurality of elastic connectors, and the elastic connectors are arranged on both sides of the threaded connection portion.

[0009] As a further technical solution, it also includes: A ring cutter is threadedly connected to the threaded connection part at the bottom.

[0010] The original soil sampling device comprises the above-mentioned double-layer soil sampling tube, and further comprises: Support ring frame; A guide frame, wherein the guide frame is arranged on the support ring frame; A soil taker is lifted and lowered on the guide frame, and the soil taker is located on the central axis of the support ring frame.

[0011] As a further technical solution, the support ring frame includes: Two support blocks and two arc-shaped support members, the two support blocks are arranged at intervals, and the two ends of the arc-shaped support member are swingably connected to the two support blocks respectively, so as to adjust the angle between the arc-shaped support member and the support block, and there are two guide frames, which are vertically arranged on the top of the support block.

[0012] As a further technical solution, the arc-shaped support member has a handle groove and further includes: A pin shaft, one end of the arc-shaped support member is swingably connected to one end of the support block through a pin shaft. After the arc-shaped support member adjusts its angle, the two arc-shaped support members abut against each other or cancel the abutment. After the two arc-shaped support members abut against each other, the support ring frame becomes a storage state.

[0013] As a further technical solution, it also includes: Two limiting columns are arranged at intervals, and both ends of the limiting columns are fixedly connected to the two supporting blocks respectively. The two limiting columns have arc-shaped limiting grooves, and the arc-shaped outer cylinder is passed through the two arc-shaped limiting grooves.

[0014] As a further technical solution, the soil extractor also has a guide portion, the guide portion has a handle portion and a guide hole, and the guide frame passes through the guide hole.

[0015] The working principle and beneficial effects of the present invention are: As needed, multiple sets of double-layer soil-taking barrels can be connected to gradually explore and take soil from deep layers. There is no need to use prefabricated soil-taking barrels with fixed lengths in advance. This not only reduces costs, but also improves operational flexibility and convenience, making it easier for personnel to operate.

[0016] Threaded connection parts are arranged at both ends of the inner cylinder. On the one hand, they can be detachably connected with the power ring part of the soil extractor to realize power transmission and complete the soil extracting operation; on the other hand, they can be quickly detachably connected with the remaining inner cylinders through the connecting ring, so that each group of inner cylinders can be completely pulled out in one step, avoiding the problem of inconvenience in removing all the inner cylinders in one step in the traditional method.

[0017] The outer cylinder is divided into two arc-shaped outer cylinders, and an elastic connector is installed in the edge gap between the two; the elastic connector provides force for the two arc-shaped outer cylinders to approach each other and press against the outer wall of the inner cylinder, so as to be driven into the soil together with the inner cylinder; after the inner cylinder is pulled out during the soil removal process, the two arc-shaped outer cylinders are brought close to each other under the action of the elastic connector, the gap is eliminated, and they are separated from the soil, making it more convenient to remove the arc-shaped outer cylinders without the need for auxiliary tools, which greatly reduces the difficulty and time cost of on-site operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0019] Figure 1 It is a schematic diagram of the structure of the original soil sampling device in the present invention; Figure 2 It is a partial cross-sectional view of the double-layer soil-boring barrel in the present invention; Figure 3 This is a schematic diagram of the internal structure of the double-layer soil-boring barrel in the present invention; Figure 4 For the present invention Figure 2 Enlarged view of the middle D part; Figure 5 For the present invention Figure 3 Enlarged view of the middle F part; Figure 6 For the present invention Figure 2 Enlarged view of middle E part; Figure 7 For the present invention Figure 3 Enlarged view of the middle G section; Figure 8 For the present invention Figure 1 Enlarged view of part A in the middle; Fig. 9 This is a diagram showing the storage state of the support ring frame in the present invention; Fig.10 For the present invention Figure 1Enlarged view of middle part B; Fig.11 For the present invention Figure 1 Enlarged view of part C in the middle.

[0020] In the figure: 1. soil extractor, 101. power ring part, 102. guide part, 103. handle part, 104. guide hole, 2. inner cylinder, 201. threaded connection part, 3. arc-shaped outer cylinder, 301. gap, 302. force-bearing surface, 4. elastic connection part, 5. connecting ring, 6. ring knife, 7. supporting ring frame, 701. support block, 702. arc-shaped support part, 703. handle groove, 8. guide frame, 9. pin shaft, 10. limit column, 1001, arc-shaped limit groove. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0022] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0023] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] Reference Figure 2~Figure 7A double-layer soil sampling tube is proposed, which is used to be installed on the power ring part 101 of the soil sampling device 1 and inserted into the soil, including: an inner tube 2, both ends of the inner tube 2 have threaded connection parts 201; two arc-shaped outer tubes 3, the two arc-shaped outer tubes 3 are both sleeved on the inner tube 2, and a gap 301 is formed between the edges of the two arc-shaped outer tubes 3; an elastic connecting member 4, the two ends of the elastic connecting member 4 are respectively connected to the two arc-shaped outer tubes 3, and are located in the gap 301. The elastic connecting member 4 provides a force for the two arc-shaped outer tubes 3 to approach each other and press against the outer wall of the inner tube 2. The elastic connecting member 4 is used to drive the two arc-shaped outer tubes 3 to close after the inner tube 2 is pulled out, thereby eliminating the gap 301; a connecting ring 5, the threaded connection part 201 is used to be threadedly connected to the power ring part 101, or to be threadedly connected to the remaining inner tubes 2 through the connecting ring 5.

[0026] In this embodiment, the traditional double-layer soil sampling barrel only uses the "inner and outer sleeve" form to complete the original soil sampling operation, and is connected to the soil sampling device 1 with the help of a quick connector. In order to achieve gradual exploration and deep soil sampling, multiple groups of double-layer soil sampling barrels are sequentially abutted and slowly driven into the soil, which makes it inconvenient to directly remove all the inner barrels 2 in one step, and the outer barrel is also inconvenient to remove under the pressure of the soil. Alternatively, a prefabricated fixed-length "inner and outer sleeve" double-layer soil sampling barrel is directly used. This increases the cost on the one hand, and is inconvenient for personnel to operate on the other hand, and the single-layer structure is inconvenient for soil sampling.

[0027] like Figure 2 , 6 As shown, for the traditional double-layer structure, threaded connection parts 201 coaxially arranged therewith are welded at both ends of the inner tube 2. The use of the threaded connection part 201 is, on the one hand, to enable detachable connection with the power ring part 101 of the diesel-powered earth-pulling device 1 to realize power transmission to complete the earth-pulling operation, and to realize quick detachable connection with the remaining groups of inner tubes 2 through the connecting ring 5, so that each group of inner tubes 2 can be completely pulled out in one step.

[0028] Furthermore, in order to quickly remove the outer cylinder at the same time, the previous overall structure is changed to be divided into two arc-shaped outer cylinders 3, and an elastic connector 4 in the form of an elastic rope is installed in the gap 301 between the edges of the two. Specifically, a groove can be opened on the edge surface of the arc-shaped outer cylinder 3, and one end of the elastic connector 4 is stuck in the groove through a hard material, or is directly bolted in the groove, so as to provide a force to the two arc-shaped outer cylinders 3 to be close to the inner cylinder 2, so that it is convenient to be driven into the soil together with the inner cylinder 2. At the same time, during the soil removal process, the inner cylinder 2 is smoothly pulled out. At this time, the two arc-shaped outer cylinders 3 cancel the state of being "spread open" by the inner cylinder 2. Further, under the action of the elastic connector 4, the two arc-shaped outer cylinders 3 are close to each other, so that the gap 301 between the two is eliminated. Therefore, the length of the elastic connector 4 that is not subjected to external force normally needs to be equal to the sum of the groove depths of the two arc-shaped outer cylinders 3, and then the arc-shaped outer cylinder 3 will be separated from the soil, which is more convenient to remove the arc-shaped outer cylinder 3, so that the entire soil removal process no longer requires the cooperation of auxiliary tools, which greatly reduces the difficulty and time cost of on-site operation.

[0029] Working principle: After setting up the entire soil extractor 1, the threaded connection part 201 of the inner cylinder 2 of the first group of double-layer soil extracting cylinders is installed on the power ring part 101, and the soil extractor 1 is started to drive the first group of double-layer soil extracting cylinders into the ground; then the machine is stopped, the connection between the power ring part 101 and the threaded connection part 201 is removed, and the threaded connection part 201 of the inner cylinder 2 of the second group of double-layer soil extracting cylinders is installed on the power ring part 101. At the same time, the threaded connection part 201 of the inner cylinder 2 of the second group of double-layer soil extracting cylinders is threadedly connected to the inner cylinder 2 of the first group of double-layer soil extracting cylinders through the connecting ring 5, and the machine is started again, and the above operation is repeated until the specified depth is driven in; then the machine is stopped, and the soil extracting cylinder is slowly pulled out upwards, then each group of inner cylinders 2 will be pulled out in turn, and at the same time, each group of arc-shaped outer cylinders 3 is separated from the soil, and the workers can take them out.

[0030] Further, refer to Figure 2~Figure 4 The inner cylinder 2 and the arc-shaped outer cylinder 3 are of equal length, and both ends of the arc-shaped outer cylinder 3 have a force-bearing surface 302 .

[0031] In this embodiment, the inner cylinder 2 and the arc-shaped outer cylinder 3 are of the same length, which is convenient for early processing and production on the one hand, and on the other hand, after the power ring 101 is connected to the inner cylinder 2, some stepped parts still act on the force-bearing surface 302, so as to achieve the purpose of the power ring 101 acting on the inner cylinder 2 and the arc-shaped outer cylinder 3 synchronously. The stable structure also makes the entire soil excavation process smooth.

[0032] Further, refer to Figure 2~Figure 7 The diameter of the threaded connection part 201 is smaller than the diameter of the inner tube 2 , and the diameter of the connecting ring 5 is equal to the diameter of the inner tube 2 . The threaded connection part 201 is used to be threadedly connected to the inner wall of the power ring part 101 , or to the inner wall of the connecting ring 5 .

[0033] In this embodiment, the threaded connection part 201 is threadedly connected to the power ring part 101 or the inner wall of the connecting ring 5. In order to avoid interference with the arc-shaped outer cylinder 3 and to avoid the connection position, the diameter of the threaded connection part 201 is set to be smaller than the diameter of the inner cylinder 2.

[0034] Further, refer to Figure 4 , 5 7. Two arc-shaped outer cylinders 3 are symmetrically sleeved on the inner cylinder 2. There are a plurality of elastic connectors 4, and elastic connectors 4 are arranged on both sides of the threaded connection part 201.

[0035] In this embodiment, the two arc-shaped outer cylinders 3 need edge portions, so when they are "opened" by the inner cylinder 2, a gap 301 is formed. Therefore, the curvature of the fan-shaped cross section of the arc-shaped outer cylinder 3 should be less than π radians. The two are exactly the same and are symmetrically sleeved on the inner cylinder 2. Elastic connectors 4 are installed on both sides of the threaded connection part 201 in the gap 301, that is, a set of double-layer soil-collecting cylinders needs to be installed with two elastic connectors 4 at both ends to ensure the smooth operation of the entire working process.

[0036] Further, refer to Figure 2~Figure 7 , and also includes: a ring cutter 6, which is threadedly connected to the bottom threaded connection part 201.

[0037] In this embodiment, the ring cutter 6 is connected to the bottom threaded connection part 201 so that the initial action of driving the double-layer soil-taking barrel into the soil can be carried out more smoothly. The ring cutter 6 can use a conventional integral metal ring cutter 6, which has high strength and durability and can withstand a certain amount of pressure.

[0038] Reference Figure 1 The original soil sampler includes the above-mentioned double-layer soil sampler, and also includes: a support ring frame 7; a guide frame 8, the guide frame 8 is arranged on the support ring frame 7; a soil sampler 1, the soil sampler 1 is raised and lowered on the guide frame 8, and the soil sampler 1 is located on the central axis of the support ring frame 7.

[0039] In this embodiment, when the soil extractor 1 is working, it is often directly supported by workers all the time, which is not stable enough, and the verticality of the soil sometimes does not meet the requirements, and it may be driven into the soil obliquely, so a support ring frame 7 and a guide frame 8 are further installed to provide support for the soil extractor 1 together. The guide frame 8 is welded on the support ring frame 7 to provide a linear guide for the soil extractor 1 pushed by the worker. The design of the ring frame avoids the position of the soil extractor 1 to extract soil, and the soil extractor 1 is located on the central axis of the support ring frame 7, providing support for the soil extractor 1 from all sides, greatly improving the overall stability. The worker only needs to install the frame and the soil extractor 1, and then push the soil extractor 1 downward along the length direction of the guide frame 8 to extract soil.

[0040] Further, refer to Figure 1The support ring frame 7 includes: two support blocks 701 and two arc-shaped support members 702. The two support blocks 701 are arranged at intervals. The two ends of the arc-shaped support member 702 are swingably connected to the two support blocks 701 respectively, so as to adjust the angle between the arc-shaped support member 702 and the support block 701. There are two guide frames 8, and the guide frames 8 are vertically arranged on the top of the support block 701.

[0041] In this embodiment, the support ring frame 7 can be an integral metal structure, which can adapt to most working scenarios. However, when facing the intersection of a small part of the plane and the slope, the support ring frame 7 cannot be completely in contact with the ground and may shake, resulting in an inability to stably support. Therefore, the support ring frame 7 is further configured as a split type, specifically consisting of two support blocks 701 and two arc-shaped support members 702. The two ends of the arc-shaped support member 702 are detachably connected to the same end of the two support blocks 701, so that the four parts are alternately connected end to end in turn to form a ring for stable support. The detachable connection is intended to achieve the ability to adjust the arc-shaped support member 702. The core purpose of the angle between the support block 701 is to better adapt to the ground with an inclined angle. By adjusting the "angle" of the entire support ring frame 7 in advance, it can be ensured that it is in full contact with the ground, avoiding shaking and stabilizing the entire process. There are many forms of detachable connection that can adjust the angle, such as pin shaft 9 connection and threaded connection, etc. Another purpose is to facilitate disassembly and assembly; since the soil extractor 1 is located on the central axis of the support ring frame 7, in order to ensure that the guide frame 8 provides a stable guiding effect, a guide frame 8 is welded on each of the two support blocks 701, and the two sides of the soil extractor 1 slide on the two guide frames 8 respectively.

[0042] Further, refer to Figure 1 , 8 , 9, the arc-shaped support member 702 has a handle groove 703, and also includes: a pin shaft 9, one end of the arc-shaped support member 702 is swingably connected to one end of the support block 701 through the pin shaft 9, after the arc-shaped support member 702 adjusts its angle, the two arc-shaped support members 702 abut against each other or cancel the abutment, after the two arc-shaped support members 702 abut against each other, the support ring frame 7 changes to a storage state.

[0043] In this embodiment, the pin 9 connection form is selected for easier operation. When the angles of the arc-shaped support member 702 and the support block 701 are adjusted and the hole positions correspond, the pin 9 is directly inserted to fix the two and their angles. The pin 9 can use a square pin or a regular polygonal pin 9, and both must be set in advance according to the angle that needs to be adjusted. As shown in the figure, the regular polygonal pin 9 is used, and the adjustable angle range is wider.

[0044] Further, if Fig. 9As shown, the two arc-shaped support members 702 can form a state of abutment after adjusting the angle, that is, the storage state. The entire guide frame 8, the support block 701 and the arc-shaped support member 702 form a U-shaped structure, which is more convenient for workers to take and operate. Therefore, a handle groove 703 is set in the middle part of the arc-shaped support member 702, so that in the storage state, the worker can hold the two handle grooves 703 in a more comfortable posture to move the entire frame.

[0045] Further, refer to Figure 1 , 9 , 10, and also includes: two limiting columns 10, the two limiting columns 10 are arranged at an interval, the two ends of the limiting columns 10 are respectively fixedly connected to the two supporting blocks 701, and the two limiting columns 10 have an arc-shaped limiting groove 1001, and the arc-shaped outer cylinder 3 is passed between the two arc-shaped limiting grooves 1001.

[0046] In this embodiment, two limiting columns 10 are welded between two spaced-apart support blocks 701. On the one hand, they can provide a large counterweight together with the entire support ring frame 7. Metal material is used to provide a more stable support effect. On the other hand, the arc-shaped limiting grooves 1001 on the two limiting columns 10 can allow the arc-shaped outer cylinder 3 to pass through. The two are arranged relative to each other to form a limiting area of ​​the arc-shaped outer cylinder 3 to further improve the soil sampling stability of the double-layer soil sampling cylinder.

[0047] Further, refer to Figure 1 , 11 The soil extractor 1 also has a guide portion 102 , the guide portion 102 has a handle portion 103 and a guide hole 104 , and the guide frame 8 passes through the guide hole 104 .

[0048] In the present embodiment, both sides of the soil picker 1 slide on the guide frame 8 through the guide parts 102 welded thereon. Specifically, the guide part 102 is provided with a handle part 103 for workers to conveniently hold and take the soil, and a guide hole 104 for the guide frame 8 in the form of a guide column to pass through, so as to more stably limit the freedom of movement of the soil picker 1, improve the movement accuracy, and stabilize the soil picking process.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A double-layer soil collecting tube, used to be installed on the power ring (101) of the soil collecting device (1) and inserted into the soil, characterized in that: include: An inner cylinder (2), wherein both ends of the inner cylinder (2) have threaded connection portions (201); Two arc-shaped outer cylinders (3), the two arc-shaped outer cylinders (3) are both sleeved on the inner cylinder (2), and a gap (301) is formed between the edges of the two arc-shaped outer cylinders (3); an elastic connecting member (4), wherein two ends of the elastic connecting member (4) are respectively connected to the two arc-shaped outer cylinders (3) and are located in the gap (301); the elastic connecting member (4) provides a force for the two arc-shaped outer cylinders (3) to approach each other and press against the outer wall of the inner cylinder (2); the elastic connecting member (4) is used to drive the two arc-shaped outer cylinders (3) to close after the inner cylinder (2) is pulled out, thereby eliminating the gap (301); A connecting ring (5), wherein the threaded connection portion (201) is used to be threadedly connected to the power ring portion (101), or to be threadedly connected to the rest of the inner tube (2) through the connecting ring (5).

2. The double-layer soil collecting tube according to claim 1, characterized in that: The inner cylinder (2) and the arc-shaped outer cylinder (3) are of equal length, and both ends of the arc-shaped outer cylinder (3) have force-bearing surfaces (302).

3. The double-layer soil collecting tube according to claim 2, characterized in that: The diameter of the threaded connection part (201) is smaller than the diameter of the inner cylinder (2), the diameter of the connection ring (5) is equal to the diameter of the inner cylinder (2), and the threaded connection part (201) is used to be threadedly connected to the inner wall of the power ring part (101) or to be threadedly connected to the inner wall of the connection ring (5).

4. The double-layer soil collecting tube according to claim 1, characterized in that: The two arc-shaped outer cylinders (3) are symmetrically sleeved on the inner cylinder (2), the elastic connecting members (4) are multiple in number, and the elastic connecting members (4) are arranged on both sides of the threaded connection part (201).

5. The double-layer soil collecting tube according to claim 1, characterized in that: Also includes: A ring cutter (6), the ring cutter (6) being threadedly connected to the threaded connection portion (201) at the bottom.

6. An original soil sampling device, comprising the double-layer soil sampling tube according to any one of claims 1 to 5, characterized in that: Also includes: Support ring frame (7); A guide frame (8), wherein the guide frame (8) is arranged on the support ring frame (7); A soil extractor (1), wherein the soil extractor (1) is arranged on the guide frame (8) in a lifting manner, and the soil extractor (1) is located on the central axis of the support ring frame (7).

7. The undisturbed soil sampling device according to claim 6, characterized in that: The support ring frame (7) comprises: Two support blocks (701) and two arc-shaped support members (702), the two support blocks (701) being arranged at intervals, the two ends of the arc-shaped support member (702) being swingably connected to the two support blocks (701) respectively, for adjusting the angle between the arc-shaped support member (702) and the support block (701), and the guide frames (8) being two, and the guide frames (8) being arranged vertically on the top of the support blocks (701).

8. The undisturbed soil sampling device according to claim 7, characterized in that: The arc-shaped support member (702) has a handle groove (703) and further comprises: A pin shaft (9), one end of the arc-shaped support member (702) is swingably connected to one end of the support block (701) via the pin shaft (9); after the arc-shaped support member (702) adjusts its angle, the two arc-shaped support members (702) abut against each other or cancel the abutment; after the two arc-shaped support members (702) abut against each other, the support ring frame (7) changes to a storage state.

9. The undisturbed soil sampling device according to claim 7, characterized in that: Also includes: Two limiting columns (10), the two limiting columns (10) are arranged at intervals, the two ends of the limiting columns (10) are respectively fixedly connected to the two supporting blocks (701), the two limiting columns (10) both have arc-shaped limiting grooves (1001), and the arc-shaped outer cylinder (3) is passed through the two arc-shaped limiting grooves (1001).

10. The undisturbed soil sampler according to claim 7, wherein the guide frame (8) is a guide column, characterized in that: The soil extractor (1) further comprises a guide portion (102), wherein the guide portion (102) comprises a handle portion (103) and a guide hole (104), and the guide frame (8) passes through the guide hole (104).

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