Undisturbed soil reconnaissance sampling device capable of achieving pressure maintaining effect

Abstract

The invention relates to an undisturbed soil exploration sampling device capable of achieving a pressure maintaining effect, which comprises a probe rod, a static sounding device is arranged in the probe rod, and after the probe rod drills into a stratum, the static sounding device is pushed to drill downwards so as to carry out undisturbed soil exploration; after the undisturbed soil is surveyed, the static sounding device is taken out, and the sampler is arranged in the probe rod; the sampler comprises a shell and a flexible film arranged in the shell, a bottom plate storage bin is arranged at the bottom of the shell, an outer-layer top plate is arranged on the top of the shell, the two ends of the flexible film are connected with an inner ring of the bottom plate storage bin and the outer-layer top plate respectively to form a sealed outer cavity, an inner cavity is formed in the inner side of the flexible film, an inner-layer top plate is arranged in the inner cavity, and the outer-layer top plate is provided with a top plate check block. A bottom plate module is arranged in the bottom plate storage bin; during sampling, downward pressure is generated on a sampled soil body through the inner-layer top plate at the top of the inner cavity, a hydraulic medium is introduced into the outer cavity, lateral pressure is applied to the soil body in the inner cavity through the flexible film, the bottom plate module is rotated, an opening in the lower portion of the inner cavity is sealed, and the pressed state of the soil body in the inner cavity is kept.

Description

Technical Field

[0001] The invention relates to an original soil survey and sampling device for realizing pressure-maintaining effect, belonging to the technical field of geotechnical in-situ testing. Background Art

[0002] In the field of geological survey and geotechnical engineering, soil survey and sampling analysis are the basis of project design and construction. At present, the traditional soil survey and sampling methods are mostly carried out by drilling holes separately, that is, firstly, the soil layer is surveyed by static penetration and other technical means to obtain the physical and mechanical properties of the soil layer; then, drilling and sampling are carried out at another location to obtain soil samples for laboratory analysis. Although this method can obtain relatively accurate survey and sampling data, it has problems such as cumbersome operation, low work efficiency and high cost.

[0003] In terms of soil sampling technology, existing samplers mostly adopt a single-structure cylindrical design, which directly presses into the soil to obtain samples. However, this sampling method is prone to failure to apply effective confining pressure and top pressure to the soil, which may cause the soil to deform or be damaged due to pressure release after extraction, resulting in the extracted samples not being able to accurately reflect the true properties of the soil.

[0004] Therefore, developing a device that can combine static probing and soil sampling functions to achieve continuous exploration and sampling operations in the same borehole, and can apply precise confining pressure and top pressure to the sampled soil to maintain the original structure and properties of the soil has become a goal pursued by technical personnel in this field. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a device which combines the functions of static penetration and soil sampling and maintains the original pressure of the sampled soil.

[0006] In order to achieve the above-mentioned purpose, the technical scheme proposed by the present invention is as follows: an original soil survey sampling device for achieving pressure-maintaining effect, comprising a probe rod, a static probe, a hydraulic jacking mechanism, and a sampler; the probe rod is hollow, the static probe and the hydraulic jacking mechanism are detachably arranged in the probe rod, the static probe can be exposed from the bottom of the probe rod, and the two ends of the hydraulic jacking mechanism are respectively against the top of the static probe and the inner wall of the probe rod; the sampler comprises a cylindrical shell and a cylindrical flexible membrane arranged in the shell, an annular bottom plate storage bin is provided at the bottom of the shell, and an annular outer top plate is provided at the top, the two ends of the flexible membrane are respectively connected with the inner ring of the bottom plate storage bin and the inner ring of the outer top plate to form a sealed outer cavity, the outer cavity is connected with a hydraulic pipe, the inner side of the cylindrical flexible membrane forms an inner cavity with upper and lower openings, the inner cavity is slidably connected with the inner top plate, the inner side of the outer top plate is provided with a top plate stopper extending inward, and the bottom plate storage bin is provided with a plurality of rotatable bottom plate modules;

[0007] After the probe rod is drilled into the stratum, the hydraulic jacking mechanism pushes the static probe to drill downward to conduct undisturbed soil survey; after the undisturbed soil survey is completed, the static probe and the hydraulic jacking mechanism are taken out, the sampler is placed in the probe rod, and the sampler is pushed downward to press the sampler into the soil, the soil enters the inner cavity from the lower opening of the inner cavity, and pushes the inner top plate to move upward until it contacts the top plate block, closing the upper opening of the inner cavity, the inner top plate generates downward pressure on the soil due to the action of the top plate block, hydraulic medium is introduced into the outer cavity, lateral pressure is applied to the soil in the inner cavity through the flexible membrane, the bottom plate module is rotated, and several bottom plate modules are spliced ​​into the inner bottom plate, the lower opening of the inner cavity is sealed, and the soil in the inner cavity is kept under pressure.

[0008] The further design of the above technical solution is as follows: a rotating rod is provided in the outer cavity of the sampler, the top of the rotating rod extends out of the outer top plate and is connected to the bottom plate motor, the bottom of the rotating rod extends into the bottom plate storage bin and is fixedly connected to the bottom plate module.

[0009] A soil bag is suspended below the inner top plate, with the opening of the soil bag facing downward and the open end adhered to the bottom of the bottom plate storage bin. As the inner top plate moves upward, the soil bag unfolds and wraps the soil in the inner cavity, and the bottom plate module rotates to push the opening of the soil bag inward to close.

[0010] A vacuum pump is installed on the inner top plate, and the vacuum pump is provided with an air extraction pipe which passes through the inner top plate and is connected with the soil bag.

[0011] A pointed cone is arranged at the bottom of the bottom plate storage bin, and the open end of the soil bag is pasted on the pointed cone; a push rod is connected to the bottom of the outer top plate.

[0012] A first pressure sensor is installed on the outer bottom of the probe rod, a displacement sensor is installed on the inner top plate, and a second pressure sensor is installed on the outer wall of the flexible membrane.

[0013] The outer wall of the probe rod is detachably fixed with an inclined screw driven sleeve, on which an inclined screw driving gear is meshed. The inclined screw driving gear is driven by a power device to drive the probe rod to move up and down. The probe rod is slidably connected to a probe rod bracket for supporting and guiding the probe rod.

[0014] The probe rod is detachably connected with a hollow splicing section, the bottom of the probe rod is provided with a spiral blade, the top of the probe rod and the splicing section are provided with internal threads, the bottom of the splicing section is provided with external threads matching with the internal threads, and the probe rod and the splicing section as well as adjacent splicing sections are spliced ​​by the cooperation of the internal threads and the external threads; the upper and lower ends of the outer walls of the probe rod and the splicing section are provided with detachable fixing bolts, and the inclined screw driven sleeve is embedded between the fixing bolts at the upper and lower ends.

[0015] The hydraulic lifting mechanism is arranged on the inner wall of the spiral section of the probe rod, and comprises a supporting top seat and a hydraulic cylinder fixed on the bottom of the supporting top seat, and the piston of the hydraulic cylinder abuts against the top of the static feeler.

[0016] A supporting mechanism is provided on the inner wall of the spiral section of the probe rod corresponding to the supporting top seat, and the supporting mechanism includes a supporting block which is fixed to the inner wall of the spiral section and is hollow and has an inner opening, an electromagnet fixed to the inner wall of the spiral section, a telescopic block which slides in the supporting block, and a spring connecting the electromagnet and the telescopic block; under the action of the spring, the inner end of the telescopic block extends out from the opening of the supporting block, and the supporting top seat abuts against the telescopic block. When the electromagnet is energized, the telescopic block slides outward, compressing the spring, and the inner end retracts from the opening of the supporting block, so that the hydraulic lifting mechanism and the static feeler can be taken out of the probe rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention combines a soil investigation device with an original soil sampler. After the static penetration probe completes the investigation, the probe rod is taken out, and then the sampler is directly placed in the probe rod to sample the original soil. This solves the problem of drilling holes separately for investigation and sampling of soil layers in engineering, and improves work efficiency.

[0019] When the sampler in the present invention samples soil, the soil is located in the inner cavity, and downward pressure is generated on the sampled soil through the inner top plate on the top of the inner cavity, and hydraulic medium is introduced into the outer cavity, and lateral pressure is applied to the soil in the inner cavity through the flexible membrane on the outer wall of the inner cavity, and the bottom plate module is rotated to seal the lower opening of the inner cavity to maintain the pressurized state of the soil in the inner cavity. In combination with the pressure sensor, precise confining pressure and top pressure are applied to the sampled soil to maintain the original pressure structure and properties of the soil, thereby solving the problem of pressure release after sampling of existing undisturbed soil, which leads to soil damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the spliced ​​segment;

[0022] Figure 3 is a cross-sectional view of the original soil survey device of the present invention;

[0023] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0024] Figure 5 is a cross-sectional view of the undisturbed soil sampling process of the present invention;

[0025] Figure 6 is a cross-sectional view of the undisturbed soil sampler of the present invention;

[0026] Figure 7 yes Figure 6 Cross-sectional view of the middle BB interface.

[0027] Among them, 1. probe rod, 2. spiral blade, 3. computer output end, 4. hydraulic pump, 5. first pressure sensor, 6. power equipment, 7. probe rod bracket, 8. sleeve, 9. helical screw driving gear, 10. helical screw driven sleeve, 11. main power supply, 12. fixing bolt, 13. electromagnet, 14. hydraulic lifting mechanism, 141. supporting top seat, 142. hydraulic cylinder, 143. piston, 15. static probe, 16. supporting mechanism, 161. supporting block, 162. spring, 163. telescopic block, 164. hook, 17. hydraulic pipe, 18. electromagnetic cable, 19. sampler, 20. top plate block, 21 . Rotating rod, 22. Vacuum extraction pump, 23. Exhaust pipe, 24. Flexible membrane, 25. Lifting rope, 26. Inner top plate, 27. Rotating block, 28. Bottom plate storage bin, 29. Bottom plate module, 30. Connector, 31. Second pressure sensor, 32. Displacement sensor, 33. Strip, 34. Earth bag, 35. Pressure sensor cable, 36. Cone, 37. Push rod, 38. Bottom plate motor, 39. Pin shaft, 40. Super glue, 41. Motor cable, 42. Second pressure sensor cable, 43. Displacement sensor cable, 44. Splicing section, 45. Splicing section fixing bolt, 46. External thread, 47. Internal thread. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1

[0030] The undisturbed soil survey and sampling device for achieving pressure-maintaining effect in this embodiment includes two parts: a soil survey device and an undisturbed soil sampler.

[0031] like Figure 1 and Figure 3 As shown, the survey device includes a probe rod 1, a static probe 15 and a hydraulic lifting mechanism 14; wherein the probe rod 1 is hollow, the static probe 15 and the hydraulic lifting mechanism 14 are detachably arranged in the probe rod, the probe at the bottom of the static probe 15 can be exposed from the bottom of the probe rod 1, and the two ends of the hydraulic lifting mechanism 14 are respectively against the top of the static probe 15 and the inner wall of the probe rod 1;

[0032] The probe rod 1 is drilled into the stratum under the action of the power equipment 6, and the hydraulic jacking mechanism 14 pushes the static probe to drill downward to conduct the original soil survey; when conducting the original soil survey, the static probe can not only survey the soil layer type and obtain the basic physical and mechanical properties, but also the measured cone tip resistance can provide a reference for the penetration pressure provided by the sampler when taking soil, thereby avoiding the insufficient soil taking due to the penetration pressure and the vertical compression and destruction of the taken soil due to the excessive penetration pressure.

[0033] After the original soil survey is completed, take out the static probe and hydraulic jacking mechanism, and place the sampler in the probe rod.

[0034] like Figure 5 and Figure 6 As shown, the sampler 19 includes a cylindrical shell and a cylindrical flexible membrane 24 arranged in the shell, thereby forming a double sleeve structure, a ring-shaped bottom plate storage bin 28 is provided at the bottom of the shell, and a ring-shaped outer top plate is provided on the top, and two ends of the flexible membrane 24 are respectively connected to the inner ring of the bottom plate storage bin 28 and the inner ring of the outer top plate, so that a sealed outer cavity is surrounded by the shell, the flexible membrane 24, the bottom plate storage bin 28 and the outer top plate, and the outer cavity is connected to the hydraulic pipe 17 at the outer top plate, and an inner cavity with upper and lower openings is formed on the inner side of the cylindrical flexible membrane 24, and an inner top plate 26 is slidably connected in the inner cavity, and a top plate stopper 20 extending inward is provided on the inner side of the outer top plate, and four rotatable bottom plate modules 29 are provided in the bottom plate storage bin 28.

[0035] When sampling, the pushing mechanism is extended into the probe rod 1 to push the sampler 19 downward to press the sampler 19 into the soil. The soil enters the inner cavity from the lower opening of the inner cavity and pushes the inner top plate 26 to move upward until it contacts the top plate stopper 20, thereby closing the upper opening of the inner cavity. At this time, the inner top plate 26 generates downward pressure on the soil due to the reaction force of the top plate stopper 20. The hydraulic medium is introduced into the outer cavity through the hydraulic pipe 17, and lateral pressure is applied to the soil in the inner cavity through the flexible membrane 24. The bottom plate module is controlled to rotate 29, and four bottom plate modules 29 are spliced ​​into the inner bottom plate to seal the lower opening of the inner cavity and maintain the pressurized state of the soil in the inner cavity, thereby completing the pressure-maintaining effect on the sampled soil. After sampling, the sampler 19 is removed from the probe rod 1 to obtain a soil sample with the original structure and properties.

[0036] Embodiment 2

[0037] This embodiment is further designed on the basis of the first embodiment, specifically: Figure 1As shown, the outer wall of the probe rod 1 is slidably connected with a sleeve 8, and the sleeve 8 cooperates with the pin 39 to be connected to the probe rod bracket 7, and the probe rod bracket 7 is connected to the ground structure, so as to support the probe rod 1 and guide the up and down movement of the probe rod 1 to ensure that the probe rod 1 can be vertically pressed into the ground. The power device 6 used to press the probe rod 1 into the ground has a roller, and a helical screw driving gear 9 is installed on the top of the power device 6. An helical screw driven sleeve 10 is sleeved on the outer wall of the probe rod 1, and threaded holes are installed on the outer wall of the probe rod 1 corresponding to the upper and lower ends of the helical screw driven sleeve 10. When the helical screw driven sleeve 10 is placed on the outside of the probe rod 1, the fixing bolt 12 is connected to the threaded hole to fix the helical screw driven sleeve 10.

[0038] When the probe rod 1 is drilled into the formation, the power device 6 is moved to engage the helical screw driving gear 9 with the helical screw driven sleeve 10, and the power device 6 is fixed and started, and the probe rod 1 is driven to drill into the formation through the helical screw driving gear 9 and the helical screw driven sleeve 10. At the same time, a spiral blade 2 is welded on the outer wall of the bottom of the probe rod 1 to facilitate the probe rod 1 to drill into the formation.

[0039] Combination Figure 2 As shown, when a deeper original soil survey sampling is to be carried out, a splicing section 44 can be added to the probe rod 1. The outer diameter of the splicing section 44 is consistent with the outer diameter of the original probe rod. The tops of the probe rod 1 and the splicing section 44 are both provided with internal threads 47, and the bottom of the splicing section is provided with external threads 46. The external threads 46 at the bottom of the splicing section 44 are threadedly connected with the internal threads 47 at the top of the original probe rod. The same method can also be used to continue to add another splicing section to the splicing section 44. Similarly, the upper and lower ends of the outer wall of the splicing section 44 are also provided with detachable fixing bolts 45. After the probe rod 1 is drilled into the soil, the fixing bolts 12 and the inclined screw driven sleeve 10 are removed, and the inclined screw driven sleeve 10 is sleeved on the splicing section 44 and fixed by the fixing bolts 45, and the drilling is continued in cooperation with the inclined screw driving gear 9.

[0040] A static penetration probe 15 and a hydraulic lifting mechanism 14 are placed inside the hollow probe rod 1 . A hydraulic pipe 17 of the hydraulic lifting mechanism 14 is connected from the probe rod 1 to a ground hydraulic pump 4 .

[0041] Combination Figure 3 As shown, the hydraulic lifting mechanism 14 includes a supporting top seat 141 and a hydraulic cylinder 142 fixed on the supporting top seat 141. The piston 143 of the hydraulic cylinder 142 is against the top of the static probe 15. When the corresponding formation is reached, hydraulic pressure is injected into the hydraulic cylinder 142 through the hydraulic pump 4 and the hydraulic pipe 17. The piston 143 of the hydraulic cylinder 142 pushes the static probe 15 downward to complete the original soil survey; a pressure sensor 5 is installed at the bottom of the outer side of the probe rod 1, which is connected to the output terminal 3 of the ground computer through the pressure sensor cable 35, and is used to measure the soil pressure when the probe rod is drilled to the corresponding formation.

[0042] Combination Figure 4As shown, in order to prevent the static probe 15 from being pressed into the probe rod 1 due to the resistance of the soil when the probe rod 1 drills into the ground, and at the same time provide a reaction force for the hydraulic jacking mechanism 14 when it is working, a support block 161 is welded inside the probe rod 1 at the position corresponding to the top of the hydraulic jacking mechanism 14. The support block 161 is a hollow structure and has an opening at the inner end. A spring 162 is built into the support block 161. The spring 162 is placed on the support block 161 close to the inner wall end of the probe rod 1, and one end is connected to a telescopic block 163 through a hook 164. Under the action of the spring 162, the inner end of the telescopic block 163 extends out from the opening of the support block 161. An electromagnet 13 is provided at a corresponding position inside the wall of the probe rod 1. The electromagnet 13 is activated by an electromagnetic cable 18 connected to the ground main power supply 11. After activation, the telescopic block 163 is controlled to compress the spring 162 to move outward, and the inner end retracts from the opening of the support block 161, providing space for the static feeler 15 and the hydraulic jacking mechanism 14 to be placed at the bottom of the probe rod 1; by canceling the power supply to the electromagnet 13, the spring 162 pushes the telescopic block 163 to slide inside the support block 161 and extend from the opening of the support block 161. When the hydraulic jacking mechanism 14 is working, the support top seat 141 abuts against the inner end of the telescopic block 163, thereby providing a reaction force for the hydraulic jacking mechanism 14 when it is working, preventing the probe of the static feeler 15 from being pressed back into the probe rod 1 due to the resistance of the soil when the probe rod 1 drills into the formation.

[0043] Combination Figure 5 As shown, after the undisturbed soil survey is completed, the telescopic block 163 is retracted by the electromagnet 13 to retrieve the static penetration probe 15 from the probe rod 1. The sampler 19 is placed in the formation where the static penetration is performed through two connecting rods 37 of appropriate length.

[0044] Combination Figure 6 As shown, there is a pointed cone 36 at the outer layer of the bottom of the bottom plate storage bin 28, which is convenient for applying pressure to the connecting rod 37 connected to the sampler 19 by external force to push the sampler 19 downward after the sampler 19 is placed in the local layer, so that the sampler 19 is pressed into the soil to complete the sampling. The inner top plate 26 of the sampler 19 is a lifting structure. Before the sampler 19 samples, the inner top plate 26 is kept at the upper position of the inner cavity of the sampler 19 by the hanging rope 25.

[0045] Combination Figure 7As shown, a rotating block 27 and a bottom plate module 29 are placed in the bottom plate storage bin 28, a gear-shaped hole is provided in the rotating block 27, the rotating block 27 and the bottom plate module 29 are fixedly connected by a connecting piece 30, a rotating rod 21 is provided in the outer cavity, the top of the rotating rod 21 extends out of the outer top plate and is connected to the bottom plate motor 38, the bottom of the rotating rod 21 extends into the bottom plate storage bin 28, the extending part is provided with teeth and is fixedly connected to the connecting piece 30, and the rotating rod 21 is sealed and rotatably connected to the outer top plate and the bottom plate storage bin 28. After the sampler 19 finishes taking soil, the rotating rod 21 is controlled to rotate by the bottom plate motor 38 to drive the bottom plate module 29 to close the bottom opening of the inner cavity of the sampler 19, and seal the lower opening of the inner cavity, thereby realizing the closure of the inner cavity of the sampler 19.

[0046] In order to keep the soil sample under the original pressure after the sampler 19 takes the soil, a soil bag 34 can be suspended under the inner top plate 26 through two strips 33, and the open end of the soil bag 34 is attached to the sharp cone 36 through a strong glue 40. As the sampler 19 moves downward, the inner top plate 26 moves upward, and the soil bag 34 gradually unfolds and wraps the soil in the inner cavity. The bottom plate module 29 rotates to push the opening of the soil bag 34 to close inward and completely wrap the soil. A vacuum pump 22 is installed on the inner top plate 26. The vacuum pump 22 is connected to an exhaust pipe 23 passing through the inner top plate 26. The air in the sampled soil in the soil bag 34 is extracted through the vacuum pump 22 and the exhaust pipe 23, so that there is a pressure difference between the inner layer of the sampler 19 and the outside world. The high pressure of the outside world cooperates with the thrust of the push rod 37 to apply top pressure to the sampled soil through the inner top plate 26 of the sampler 19.

[0047] A displacement sensor 32 and a pressure sensor are installed on the inner top plate 26 to monitor the vertical compression distance of the sampled soil. The displacement sensor cable 43 is connected to the computer output terminal 3 and cooperates with the pressure sensor to monitor the pressure on the top of the sampled soil.

[0048] In order to apply corresponding lateral pressure to the soil, after applying corresponding pressure to the top of the sampled soil, hydraulic pressure is injected into the outer layer of the sampler 19 through the hydraulic pump 4 and the hydraulic pipe 17 on the surface. The hydraulic pressure acts on the flexible film 24 to apply lateral pressure to the sampled soil. At the same time, a second pressure sensor 31 is installed on the inner wall of the outer layer of the sampler 19. The second pressure sensor 31 is connected to the computer output terminal 3 through the second sensor cable 42 to monitor the lateral pressure of the sampled soil caused by the injected hydraulic pressure. The hydraulic pressure must be equal to the soil pressure measured by the pressure sensor 5.

[0049] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technical personnel in the relevant technical field, without departing from the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the present invention and still falls within the protection scope of the present invention.

Claims

1. An undisturbed soil survey and sampling device for achieving pressure-maintaining effect, characterized in that: Including probe rod, static probe, hydraulic lifting mechanism and sampler; The probe rod is hollow, and the static probe and the hydraulic lifting mechanism are detachably arranged in the probe rod. The static probe can be exposed from the bottom of the probe rod, and the two ends of the hydraulic lifting mechanism are respectively against the top of the static probe and the inner wall of the probe rod; The sampler comprises a cylindrical shell and a cylindrical flexible membrane arranged in the shell, an annular bottom plate storage bin is arranged at the bottom of the shell, an annular outer top plate is arranged at the top, two ends of the flexible membrane are respectively connected with the inner ring of the bottom plate storage bin and the inner ring of the outer top plate to form a sealed outer cavity, the outer cavity is connected with a hydraulic pipe, an inner cavity with upper and lower openings is formed inside the cylindrical flexible membrane, an inner top plate is slidably connected inside the inner cavity, a top plate stopper extending inward is arranged inside the outer top plate, and a plurality of rotatable bottom plate modules are arranged in the bottom plate storage bin; After the probe rod is drilled into the ground, the hydraulic jacking mechanism pushes the static probe downward to conduct undisturbed soil survey; After the original soil survey is completed, the static probe and hydraulic jacking mechanism are taken out, the sampler is placed in the probe rod, and the sampler is pushed downward to press the sampler into the soil. The soil enters the inner cavity from the lower opening of the inner cavity, and pushes the inner top plate to move upward until it hits the top plate block, closing the upper opening of the inner cavity. The inner top plate generates downward pressure on the soil under the action of the top plate block, and hydraulic medium is introduced into the outer cavity. Lateral pressure is applied to the soil in the inner cavity through the flexible membrane, and the bottom plate module is rotated. Several bottom plate modules are spliced ​​into the inner bottom plate, which seals the lower opening of the inner cavity and keeps the soil in the inner cavity under pressure.

2. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 1, characterized in that: A rotating rod is arranged in the outer cavity of the sampler, the top of the rotating rod extends out of the outer top plate and is connected to the bottom plate motor, and the bottom of the rotating rod extends into the bottom plate storage bin and is fixedly connected to the bottom plate module.

3. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 2, characterized in that: A soil bag is suspended below the inner top plate, with the opening of the soil bag facing downward and the open end adhered to the bottom of the bottom plate storage bin. As the inner top plate moves upward, the soil bag unfolds and wraps the soil in the inner cavity, and the bottom plate module rotates to push the opening of the soil bag inward to close.

4. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 3, characterized in that: A vacuum pump is installed on the inner top plate, and the vacuum pump is provided with an air extraction pipe which passes through the inner top plate and is connected with the soil bag.

5. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 4, characterized in that: A pointed cone is arranged at the bottom of the bottom plate storage bin, and the open end of the soil bag is pasted on the pointed cone; a push rod is connected to the bottom of the outer top plate.

6. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 5, characterized in that: A first pressure sensor is installed on the outer bottom of the probe rod, a displacement sensor is installed on the inner top plate, and a second pressure sensor is installed on the outer wall of the flexible membrane.

7. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 1, characterized in that: The outer wall of the probe rod is detachably fixed with an inclined screw driven sleeve, on which an inclined screw driving gear is meshed. The inclined screw driving gear is driven by a power device to drive the probe rod to move up and down. The probe rod is slidably connected to a probe rod bracket for supporting and guiding the probe rod.

8. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 7, characterized in that: The probe rod is detachably connected with a hollow splicing section, the bottom of the probe rod is provided with a spiral blade, the top of the probe rod and the splicing section are provided with internal threads, the bottom of the splicing section is provided with external threads matching with the internal threads, and the probe rod and the splicing section as well as adjacent splicing sections are spliced ​​by the cooperation of the internal threads and the external threads; the upper and lower ends of the outer walls of the probe rod and the splicing section are provided with detachable fixing bolts, and the inclined screw driven sleeve is embedded between the fixing bolts at the upper and lower ends.

9. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 8, characterized in that: The hydraulic lifting mechanism is arranged on the inner wall of the spiral section of the probe rod, and comprises a supporting top seat and a hydraulic cylinder fixed on the bottom of the supporting top seat, and the piston of the hydraulic cylinder abuts against the top of the static feeler.

10. The undisturbed soil survey and sampling device for achieving pressure-maintaining effect according to claim 9, characterized in that: A supporting mechanism is provided on the inner wall of the spiral section of the probe rod corresponding to the supporting top seat, and the supporting mechanism includes a supporting block which is fixed to the inner wall of the spiral section and is hollow and has an inner opening, an electromagnet fixed to the inner wall of the spiral section, a telescopic block which slides in the supporting block, and a spring connecting the electromagnet and the telescopic block; under the action of the spring, the inner end of the telescopic block extends out from the opening of the supporting block, and the supporting top seat abuts against the telescopic block. When the electromagnet is energized, the telescopic block slides outward, compressing the spring, and the inner end retracts from the opening of the supporting block, so that the hydraulic lifting mechanism and the static feeler can be taken out of the probe rod.

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