In-situ soil sampler

Abstract

The invention relates to the technical field of soil sampling, and discloses an in-situ soil sampler which comprises a connecting joint connected with a driving drill rod of a drilling machine, the other end of the connecting joint is rotatably connected with a connecting pipe through a bearing seat, and one end of the connecting pipe is provided with an inner pipe body through a connecting part; a sample bearing pipe for accommodating a soil sample is placed in the inner pipe body, one end of the inner pipe body is in threaded connection with an inner pipe shoe for limiting the sample bearing pipe, and the middle part of the connecting joint is in threaded connection with an outer pipe body for completely sleeving the inner pipe body. According to the sampling device, the arranged drainage assembly is matched with the one-way water outlet assembly, so that water entering the inner pipe body and the sample bearing pipe can be extruded and discharged in the sampling process, the situation that the taken sample soil contains more water is avoided, and it is ensured that the taken soil has extremely high undisturbed property and structural integrity.

Description

Technical Field

[0001] This invention relates to the field of soil sampling technology, and more specifically to an in-situ soil sampler. Background Technology

[0002] In fields such as geotechnical engineering investigation, mineral geological exploration, environmental monitoring, and cultural relics archaeology and protection, obtaining high-quality undisturbed soil samples is the foundation for accurate physical and mechanical property testing, microstructure analysis, chemical property research, and historical information interpretation.

[0003] In the process of mineral geological exploration using high technology, in-situ soil samplers are the core equipment for completing this critical task, and their performance directly determines the degree of disturbance and representativeness of the soil sample.

[0004] Currently, commonly used soil samplers basically follow the working principle of "outer tube cutting and inner tube sampling". However, when the soil sampler is first placed into the borehole, water will enter the inner tube and the sampling core tube due to the presence of water in the borehole. If the water that has entered the interior is not treated, it will affect the original state and structural integrity of the soil sample. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an in-situ soil sampler to solve the problem that when the soil sampler is first placed into the borehole, water will enter the inner tube and the sampling core tube due to the presence of water in the borehole. If the water entering the interior is not treated, it will affect the original state and structural integrity of the soil sample.

[0006] This invention provides the following technical solution: an in-situ soil sampler, comprising a connecting joint connected to the drive drill rod of a drilling rig, the other end of the connecting joint being rotatably connected to a connecting pipe via a bearing seat, one end of the connecting pipe being provided with an inner tube body via a connecting component, the inner tube body containing a sample carrier tube for holding soil samples being placed inside, one end of the inner tube body being threadedly connected to an inner tube shoe for limiting the position of the sample carrier tube, the middle part of the connecting joint being threadedly connected to an outer tube body that completely encloses the inner tube body, one end of the outer tube body being threadedly connected to a drill bit responsible for cutting and drilling into the strata and opening a channel for the inner tube body, the inner tube body, the connecting pipe, and the connecting joint being interconnected, a drainage component being provided between the connecting pipe and the inner tube body for draining water from the sample carrier tube inside the inner tube body, and multiple through-holes being arranged in a ring array on the outer circumference of the connecting pipe for allowing water to enter between the inner tube body and the outer tube body.

[0007] As a further embodiment of the present invention, the drainage assembly includes a water outlet pipe fixedly connected to one end of the inner pipe body to cover the opening. The closed end of the water outlet pipe has a drainage hole, and the inner circumferential wall of the drainage hole is integrally formed with an internal threaded ring. The internal threaded ring is provided with a one-way water outlet assembly inside.

[0008] As a further embodiment of the present invention, the connecting component includes an annular protrusion fixedly connected to one end of the inner tube body. The inner circumference of the annular protrusion is provided with a locking internal thread, and an annular notch is provided at one end of the outer circumference of the connecting tube. The inner circumference of the annular notch is provided with a locking external thread that cooperates with the locking internal thread.

[0009] As a further embodiment of the present invention, the unidirectional water outlet assembly includes a threaded insert threadedly connected to an internal threaded ring or connecting thread. The threaded insert has a stepped hole, and a silica gel block is placed inside the large diameter of the stepped hole. A limiting thread is formed on the inner circumference of the large diameter portion of the stepped hole. An external threaded pressure ring is connected to the internal thread of the limiting thread to press the silica gel block tightly. A through cross-shaped eye is formed on one side of the silica gel block to allow water in the sample carrier tube to drain out.

[0010] As a further embodiment of the present invention, the drainage assembly includes a second outlet pipe fixedly connected to one end of the inner pipe body and covering the opening. The outer circumference of the second outlet pipe is welded with a plurality of connecting pipes that communicate with the second outlet pipe in a ring array. The outer circumference of the connecting pipe is provided with a plurality of circular grooves in a ring array. The free end of the connecting pipe passes through the side wall of the connecting pipe and is flush with the bottom inner wall of the circular groove. The inner circumference of the end of the connecting pipe located in the circular groove is provided with a connecting thread.

[0011] As a further embodiment of the present invention, the other end of the second water outlet pipe is also open, and a sealing head is threadedly connected to the inside of the circumference of this open end.

[0012] As a further embodiment of the present invention, a cross-shaped groove for a standard tool interface is provided on one side of the sealing head.

[0013] As a further embodiment of the present invention, a cross-shaped baffle is integrally formed inside the circumference of the small diameter part of the threaded insert to block the back of the silicone block.

[0014] As a further embodiment of the present invention, the end of the connecting connector used to connect the driving component is provided with an external hexagonal or internal hexagonal driving interface, and the center of the driving interface is provided with a water passage hole communicating with the inner cavity of the connecting pipe.

[0015] As a further embodiment of the present invention, a sealing sleeve is provided on the outer circumferential wall of the large diameter threaded insert.

[0016] The technical effects and advantages of this invention are as follows: 1. The present invention, through the combination of a drainage component and a one-way water outlet component, can squeeze out the water entering the inner tube and the sample carrying tube during the sampling process, thereby avoiding the presence of excessive water in the soil sample and ensuring that the soil sample has extremely high original state and structural integrity.

[0017] 2. The present invention features multi-channel parallel drainage. Even if individual connecting pipes are temporarily blocked due to the entry of small particles or mud, other channels can remain unobstructed and continue to drain water, thus avoiding the failure of the entire sampling operation due to blockage of a single path.

[0018] 3. The sealing head at both ends of the water outlet pipe of the present invention adopts a cross-shaped groove with a standard tool interface, which facilitates disassembly, cleaning or replacement and enhances the maintenance convenience of the device.

[0019] 4. The present invention effectively prevents liquid from flowing back into the sample carrier tube and contaminating the soil sample by setting a cross-shaped baffle on the back of the silicone block to block the back of the silicone block.

[0020] 5. The present invention ensures that the connection between the two is both stable and has good sealing performance by fitting a sealing sleeve on the outer wall of the large diameter circumference of the threaded insert, effectively preventing liquid from seeping in from the outside and ensuring the reliability of the entire structure. Attached Figure Description

[0021] Figure 1 This is a perspective view of Embodiment 1 of the present invention.

[0022] Figure 2 This is Embodiment 1 of the present invention. Figure 1 Exploded view.

[0023] Figure 3 This is a structural diagram of the connecting joint, connecting pipe, and inner pipe body according to Embodiment 1 of the present invention.

[0024] Figure 4 This is a structural diagram of the drainage component according to Embodiment 1 of the present invention.

[0025] Figure 5 This is an exploded view of the threaded insert and silicone block according to Embodiment 1 of the present invention.

[0026] Figure 6 This is a schematic diagram of the threaded insert, silicone block, and external threaded pressure ring according to Embodiment 1 of the present invention.

[0027] Figure 7 This is a structural diagram of the drainage component according to Embodiment 2 of the present invention.

[0028] Figure 8 This is a diagram of the internal structure of the connecting pipe in Embodiment 2 of the present invention.

[0029] Figure 9This is a schematic diagram of the top of the connecting pipe in Embodiment 2 of the present invention.

[0030] The attached figures are labeled as follows: 1. Connecting joint; 2. Connecting pipe; 3. Inner tube body; 4. Outer tube body; 5. Inner tube shoe; 6. Drill bit; 7. Drainage assembly; 8. Connecting component; 9. Water inlet; 10. Sample carrier tube; 70101, Water outlet pipe 1; 70102, Drain hole; 70103, Internal threaded ring; 70104, Threaded insert; 70105, Stepped hole; 70106, Limiting thread; 70107, Silicone block; 70108, External threaded pressure ring; 70109, Cross-shaped eye; 70110, Cross-shaped stop; 70201, Outlet pipe 2; 70202, Connecting pipe; 70203, Circular groove; 70204, Sealing head; 70205, Connecting thread; 801. Annular notch; 802. Locking external thread; 803. Annular protrusion; 804. Locking internal thread. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1 Reference Figures 1-6 This invention provides an in-situ soil sampler, including a connecting joint 1 connected to the drive drill rod of a drilling rig. The other end of the connecting joint 1 is rotatably connected to a connecting pipe 2 via a bearing seat. One end of the connecting pipe 2 is provided with an inner tube body 3 via a connecting component 8. A sample carrier tube 10 for containing soil samples is placed inside the inner tube body 3. One end of the inner tube body 3 is threadedly connected to an inner tube shoe 5 for limiting the sample carrier tube 10. The middle part of the connecting joint 1 is threadedly connected to an outer tube body 4 that completely covers the inner tube body 3. One end of the outer tube body 4 is threadedly connected to a drill bit 6 responsible for cutting and drilling into the strata to open a channel for the inner tube body 3. The inner tube body 3, the connecting pipe 2, and the connecting joint 1 are interconnected. A drainage component 7 is provided between the connecting pipe 2 and the inner tube body 3 for draining water from the sample carrier tube 10 inside the inner tube body 3.

[0033] It should be noted that the drill bit 6 is a short metal sleeve with a relatively thick wall. The outer wall of the rear end is machined with threads for a firm connection with the outer tube body 4. The lip surface is tapered or stepped. Multiple carbide teeth or carbide blocks are inlaid or welded on the cutting edge of the lip surface. These carbide teeth are distributed in a ring array and are the part that is actually responsible for grinding the formation. Those skilled in the art can set them according to actual needs, which will not be elaborated here.

[0034] The outer circumference of the connecting pipe 2 is provided with multiple through water inlet holes 9 arranged in a ring array to allow water to enter between the inner pipe body 3 and the outer pipe body 4.

[0035] First, during installation, the clean sample carrier tube 10 is placed into the inner tube body 3, and the inner tube shoe 5 is tightened to limit the bottom end of the sample carrier tube 10. Then, the outer tube body 4 is fitted onto the outside of the inner tube body 3, and the top end is threaded to the connecting joint 1. Finally, the drill bit 6 is screwed into the bottom end of the outer tube body 4. The connecting joint 1 at the top of the soil sampler is connected to the drive drill rod of the drilling machine through its external hexagonal or internal hexagonal drive interface. The water passage hole inside the drill rod is connected to the water passage hole in the center of the connecting joint 1. Then, the entire soil sampler is lowered into the borehole to the predetermined sampling depth through the drill rod.

[0036] The connecting connector 1 is provided with a hexagonal or hexagonal drive interface at one end for connecting the drive component, and a water passage hole communicating with the inner cavity of the connecting pipe 2 is provided at the center of the drive interface.

[0037] When the drilling rig starts, it provides axial pressure and rotational torque. The torque is transmitted through the connecting joint 1 to the outer tube body 4, which is threadedly connected to the connecting joint 1, driving the drill bit 6 at the end to rotate and cut the stratum downward. At this time, the inner tube body 3 remains stationary and achieves single-motion. As the outer tube drill bit 6 cuts downward, the cut undisturbed soil enters the cutting edge of the inner tube shoe 5 smoothly under the action of axial pressure and is squeezed upward into the sample bearing tube 10.

[0038] The center lines of the outer tube body 4, the inner tube body 3, and the connecting joint 1 are coincident, thereby ensuring that the outer tube body 4 always rotates concentrically with the inner tube body 3 during rotation, effectively reducing swaying, and relying on the water filling the annular cavity between the inner tube body 3 and the outer tube body 4 to provide a certain amount of hydrodynamic damping and support.

[0039] During the sampling process, after the device is placed into the borehole, the water in the borehole will enter the sample carrier tube 10. As the soil sample enters the sealed sample carrier tube 10, the water and air inside the sample carrier tube 10 are squeezed and pressure is generated. This pressure pushes the fluid through the inner tube body 3 upward to the drainage component 7 at the top.

[0040] In this invention, the drainage component 7 includes a water outlet pipe 70101 that is fixedly connected to one end of the inner tube body 3 by bolts to cover the opening. The closed end of the water outlet pipe 70101 is provided with a drainage hole 70102. The inner circumferential wall of the drainage hole 70102 is integrally formed with an internal threaded ring 70103. The internal threaded ring 70103 is provided with a one-way water outlet component inside.

[0041] The drainage component 7 can squeeze out the water entering the inner tube 3 and the sample carrying tube 10 during the sampling process, thus avoiding the soil sample containing too much water and ensuring that the soil sample has a high degree of originality and structural integrity.

[0042] Furthermore, the connecting component 8 includes an annular protrusion 803 that is fixedly connected to one end of the inner tube body 3 by bolts. The inner circumference of the annular protrusion 803 is provided with a locking internal thread 804, and an annular notch 801 is provided at one end of the outer circumference of the connecting tube 2. The inner circumference of the annular notch 801 is provided with a locking external thread 802 that cooperates with the locking internal thread 804, thereby separating the inner tube body 3 from the connecting tube 2 and facilitating internal cleaning.

[0043] Furthermore, the one-way water outlet assembly includes a threaded insert 70104 threadedly connected to an internal threaded ring 70103 or a connecting thread 70205. The threaded insert 70104 has a stepped hole 70105. A silicone block 70107 is placed inside the large diameter of the stepped hole 70105. A limiting thread 70106 is formed on the inner circumference of the large diameter portion of the stepped hole 70105. An external threaded pressure ring 70108 is connected to the limiting thread 70106 to press the silicone block 70107 tightly. A through cross-shaped eye 70109 is formed on one side of the silicone block 70107 to allow water in the sample carrier tube 10 to drain out.

[0044] Fluid pressure acts on the silicone block 70107 in the one-way water outlet assembly, causing the silicone block 70107 to undergo elastic deformation. The originally closed cross-shaped eye 70109 is opened to form a drainage channel. The squeezed water is discharged sequentially through the stepped hole 70105, the threaded insert 70104 and the drain hole 70102 into the annular gap between the connecting pipe 2 and the outer pipe body 4.

[0045] After the device is lifted, the soil sample sinks into the sample carrier tube 10 and the inner tube body 3, forming a negative pressure that causes the closed cross-shaped eye 70109 on the silicone block 70107 to effectively prevent liquid from flowing back into the sample carrier tube 10 and contaminating the soil sample.

[0046] In particular, the small diameter part of the threaded insert 70104 has an integrally formed cross-shaped baffle 70110, which ensures that the silicone block 70107 will not be displaced in the opposite direction under pressure, and is used to block the back of the silicone block 70107.

[0047] After sampling is completed, first remove the outer tube body 4 and drill bit 6 to expose the inner tube body 3. Then unscrew the inner tube shoe 5, and the sample carrier tube 10 containing the intact undisturbed soil sample can be taken out from the inner tube body 3. Seal and label both ends to complete the entire sampling process.

[0048] The outer circumferential wall of the large-diameter threaded insert is fitted with a sealing sleeve. The sealing sleeve is made of rubber or polymer material with good elasticity, wear resistance and media resistance, such as nitrile rubber (NBR), fluororubber (FKM) or polyurethane (PU). Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0049] The present invention is used in the following steps: S1: First, place the clean sample carrier tube 10 into the inner tube body 3 and tighten the inner tube shoe 5 to limit the bottom end of the sample carrier tube 10. Then, put the outer tube body 4 on the outside of the inner tube body 3 and fix the top end to the connecting joint 1 with threads. Finally, screw the drill bit 6 into the bottom end of the outer tube body 4. The connecting joint 1 at the top of the soil sampler is connected to the drive drill rod of the drilling machine through its external hexagonal or internal hexagonal drive interface. The water passage hole inside the drill rod is connected to the water passage hole in the center of the connecting joint 1. Then, the entire soil sampler is lowered to the predetermined sampling depth in the borehole through the drill rod. S2: When the drilling rig starts, it provides axial pressure and rotational torque. The torque is transmitted to the outer tube body 4, which is threadedly connected to the connecting joint 1, through the connecting joint 1. This drives the drill bit 6 at the end to rotate and cut the strata downwards. At this time, the inner tube body 3 remains stationary and achieves single-motion. As the outer tube drill bit 6 cuts downwards, the original soil being cut enters the cutting edge of the inner tube shoe 5 smoothly under the action of axial pressure and is squeezed upwards into the sample bearing tube 10. S3: During the sampling process, after the device is placed into the borehole, the water in the borehole will enter the sample carrier tube 10. As the soil sample enters the sealed sample carrier tube 10, the water and air inside the sample carrier tube 10 are compressed, generating pressure. This pressure pushes the fluid upward through the inner tube body 3 to the drainage component 7 at the top. The fluid pressure acts on the silicone block 70107 in the one-way water outlet component, causing the silicone block 70107 to undergo elastic deformation. The originally closed cross-shaped eye 70109 is opened, forming a drainage passage. The squeezed-out water is discharged sequentially through the stepped hole 70105, the threaded insert 70104, and the drainage hole 70102 into the annular gap between the connecting pipe 2 and the outer pipe body 4. The cross-shaped baffle 70110 ensures that the silica gel block 70107 will not undergo reverse displacement under pressure. After the device is lifted, the soil sample sinks into the sample bearing tube 10 and the inner pipe body 3 to form a negative pressure, which closes the cross-shaped eye 70109 on the silica gel block 70107, effectively preventing liquid from flowing back into the sample bearing tube 10 and contaminating the soil sample. S4: After sampling is completed, first remove the outer tube body 4 and drill bit 6 to expose the inner tube body 3. Then unscrew the inner tube shoe 5 to remove the sample carrier tube 10 containing the intact undisturbed soil sample from the inner tube body 3. Seal and label both ends to complete the entire sampling process.

[0050] Example 2 Reference Figures 6-9 The present invention provides an in-situ soil sampler. The drainage component 7 includes a second water outlet pipe 70201 that is fixedly connected to one end of the inner tube body 3 by bolts and covers the opening. The outer circumference of the second water outlet pipe 70201 is welded with a plurality of connecting pipes 70202 that are connected to the second water outlet pipe 70201 in a ring array. The outer circumference of the connecting pipe 2 is provided with a plurality of circular grooves 70203 in a ring array. The free end of the connecting pipe 70202 passes through the side wall of the connecting pipe 2 and is flush with the bottom inner wall of the circular groove 70203. The inner circumference of the end of the connecting pipe 70202 located in the circular groove 70203 is provided with a connecting thread 70205. The other end of the second water outlet pipe 70201 is also provided with an opening, and a sealing head 70204 is connected to the inner circumference of this opening end.

[0051] The plugging head 70204 has a cross-shaped groove with a standard tool interface on one side, which facilitates disassembly, cleaning or replacement and enhances the ease of maintenance of the device.

[0052] With multiple channels for parallel drainage, even if one of the connecting pipes 70202 is temporarily blocked due to the entry of small particles or mud, the other channels can remain unobstructed and continue to drain, thus avoiding the failure of the entire sampling operation due to a blockage in a single path.

[0053] When in use, after the sample enters, the internal space of the inner tube 3 and the sample carrier tube 10 is squeezed, and the squeezed water flows upward into the cavity of the outlet tube 70201. Since the other end of the cavity is sealed by the plug 70204, the water flow is quickly dispersed into multiple connecting tubes 70202 distributed in a ring array.

[0054] The inner diameter of the internal threaded ring 70103 is equal to the inner diameter of the connecting pipe 70202, and the internal thread of the internal threaded ring 70103 is the same as the connecting thread 70205 on the inner circumference of one end of the connecting pipe 70202.

[0055] Multiple connecting pipes 70202 provide a larger total flow area and more drainage paths, which can quickly divert water from the soil sample, greatly reduce the resistance of the drainage path, and avoid blockage or flow rate bottleneck that may occur in a single path. The water is finally discharged through each connecting pipe 70202 and flows into the annular gap between the inner pipe body 3 and the outer pipe body 4.

[0056] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change. The electronic components and modules used in this invention can all be commonly used parts on the market that can achieve the specific functions in this case, and the specific models and sizes can be selected and adjusted according to actual needs; The accompanying drawings of the embodiments disclosed in this invention only involve structures relevant to the embodiments disclosed in this invention. Other structures can be referred to with common designs. Unless otherwise specified, the same embodiment and different embodiments of this invention can be combined with each other.

Claims

1. An in-situ soil sampler, comprising a connecting joint (1) connected to the drive drill rod of a drilling rig, characterized in that: The other end of the connecting joint (1) is rotatably connected to a connecting pipe (2) via a bearing seat. One end of the connecting pipe (2) is provided with an inner tube body (3) via a connecting component (8). A sample carrier tube (10) for containing soil samples is placed inside the inner tube body (3). One end of the inner tube body (3) is threadedly connected to an inner tube shoe (5) for limiting the sample carrier tube (10). The middle part of the connecting joint (1) is threadedly connected to an outer tube body (4) that completely covers the inner tube body (3). 4) One end is threaded with a drill bit (6) responsible for cutting and drilling into the formation to open a channel for the inner tube body (3). The inner tube body (3), the connecting pipe (2) and the connecting joint (1) are interconnected. A drainage component (7) is provided between the connecting pipe (2) and the inner tube body (3) to drain the water in the sample carrying tube (10) inside the inner tube body (3). The outer circumference of the connecting pipe (2) is provided with multiple through water inlet holes (9) in a ring array to allow water to enter between the inner tube body (3) and the outer tube body (4).

2. The in-situ soil sampler according to claim 1, characterized in that: The drainage assembly (7) includes a water outlet pipe (70101) fixedly connected to one end of the inner tube body (3) and covering the opening. The closed end of the water outlet pipe (70101) is provided with a drainage hole (70102). The inner circumferential wall of the drainage hole (70102) is integrally formed with an internal threaded ring (70103). The internal threaded ring (70103) is provided with a one-way water outlet assembly inside. The inner tube body (3) and...

3. The in-situ soil sampler according to claim 2, characterized in that: The connecting component (8) includes an annular protrusion (803) fixedly connected to one end of the inner tube body (3). The inner circumference of the annular protrusion (803) is provided with a locking internal thread (804). An annular notch (801) is provided at one end of the outer circumference of the connecting tube (2). The inner circumference of the annular notch (801) is provided with a locking external thread (802) that cooperates with the locking internal thread (804).

4. The in-situ soil sampler according to claim 2, characterized in that: The one-way water outlet assembly includes a threaded insert (70104) threadedly connected to an internal threaded ring (70103) or a connecting thread (70205). The threaded insert (70104) has a stepped hole (70105) inside. A silica gel block (70107) is placed inside the large diameter of the stepped hole (70105). A limiting thread (70106) is provided on the inner circumference of the large diameter part of the stepped hole (70105). An external threaded pressure ring (70108) is connected to the internal thread of the limiting thread (70106) to press the silica gel block (70107) tightly. A through cross-shaped eye (70109) is provided on one side of the silica gel block (70107) to allow water in the sample carrier tube (10) to drain out.

5. An in-situ soil sampler according to claim 4, characterized in that: The drainage assembly (7) includes a second outlet pipe (70201) fixedly connected to one end of the inner pipe body (3) and covering the opening. The outer circumference of the second outlet pipe (70201) is welded with a plurality of connecting pipes (70202) that communicate with the second outlet pipe (70201). The outer circumference of the connecting pipe (2) is provided with a plurality of circular grooves (70203) in a circular array. The free end of the connecting pipe (70202) passes through the side wall of the connecting pipe (2) and is flush with the bottom inner wall of the circular groove (70203). The inner circumference of the end of the connecting pipe (70202) located in the circular groove (70203) is provided with a connecting thread (70205).

6. An in-situ soil sampler according to claim 5, characterized in that: The other end of the second water outlet pipe (70201) is also open, and a plug (70204) is threaded inside the circumference of this open end.

7. An in-situ soil sampler according to claim 6, characterized in that: The plug head (70204) has a cross-shaped groove with a standard tool interface on one side.

8. An in-situ soil sampler according to claim 4, characterized in that: The threaded insert (70104) has a cross-shaped baffle (70110) integrally formed inside the circumference of the small diameter part, which is used to block the back of the silicone block (70107).

9. An in-situ soil sampler according to claim 5, characterized in that: The connecting connector (1) is provided with an external hexagonal or internal hexagonal drive interface at one end for connecting the drive component, and the center of the drive interface is provided with a water passage hole that communicates with the inner cavity of the connecting pipe (2).

10. An in-situ soil sampler according to claim 4, characterized in that: The threaded insert (70104) has a sealing sleeve fitted on its large-diameter circumferential outer wall.

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