PVC soil column sampler capable of reducing vertical compression of soil

Abstract

The utility model relates to the related field of soil samplers, and discloses a polyvinyl chloride (PVC) soil column sampler capable of reducing vertical compression of soil, which comprises a sampling tube storage barrel, a drill bit, a sealing film, a movable hole plug, a knocking cover, a pull rod and a handle. The resistance of soil and vegetation root systems is reduced through a soil breaking blade of the drill bit, and columnar soil is guided into the PVC sampling pipe through a soil guide cavity of the drill bit, so that the vertical compression of the soil is reduced, and the sampling difficulty is reduced; the PVC sampling pipe is arranged in the sampling pipe storage barrel, so that the workload of scale marking and cleaning of the PVC sampling pipe can be reduced; a sealed environment is formed by the sealing film and the movable hole plug, so that a sample can be prevented from sliding down and falling off in the PVC sampling tube during sampling; through the knocking cover, the pull rod and the handle, the sampling process can be more easily operated by a single person.

Description

Technical Field

[0001] The utility model relates to the relevant field of soil samplers, in particular to a PVC soil column sampler which can reduce the vertical compression of soil. Background Art

[0002] According to the Technical Regulations for Carbon Stock Investigation and Assessment of Salt Marsh Ecosystems (Pilot Draft), the method for investigating underground biomass of carbon stock of salt marsh plants requires: using a PVC soil column sampler to collect columnar samples at a depth of 100 cm in the middle of the sample plot; the PVC soil column sampler should be driven in slowly to ensure that there is no obvious vertical compression.

[0003] The current method is to buy PVC tubes with suitable diameters, matching caps and tapes from the market, cut the PVC tubes into 100 cm lengths, make PVC sampling tubes, and mark the scale with a marker. When sampling, cover the upper end of the PVC sampling tube with a wooden board, hit the wooden board with a hammer to knock the PVC sampling tube into the soil, and after reaching the sampling depth, dig a 100 cm pit on one side of the PVC sampling tube, lift the PVC tube from the bottom up to remove it from the soil, ensure that the bottom soil sample is in its original state, and seal the two ends with matching caps and tapes after taking it out; after sampling, use a stainless steel saw or electric circular saw to cut in layers according to the depths of 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm, 40-50 cm and 50-100 cm.

[0004] When implementing the above operations, firstly, the PVC sampling tube has poor cutting ability, because the salt marsh soil is moist and sticky and the plant root resistance is large, which makes the PVC sampling tube difficult to insert and the soil is prone to vertical compression; secondly, after the PVC sampling tube is inserted, it is difficult to remove it because the PVC sampling tube has no handle and the salt marsh soil has strong adhesion, which requires manual digging, which consumes manpower and a large workload; thirdly, after removal, the markings on the PVC sampling tube are blurred and difficult to distinguish, and it needs to be cleaned before cutting, which is time-consuming. Utility Model Content

[0005] The utility model aims to provide a PVC soil column sampler which can reduce the vertical compression of soil, so as to solve the problems of the PVC sampling tube proposed in the above background technology that it is difficult to insert, easy to compress, labor-intensive and has unclear scale.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: a PVC soil column sampler capable of reducing vertical compression of soil, comprising a sampling tube storage tube 1, a drill bit 2, a sealing film 3, a movable hole plug 4, a knocking cover 5, a pull rod 6 and a handle 7.

[0007] As a preferred solution, the sampling tube storage tube 1 can be built with a PVC sampling tube, and the inner wall of the sampling tube storage tube 1 fits the outer wall of the PVC sampling tube. The sampling tube storage tube 1 is divided into three parts according to its function, namely, a tube head 11, a tube body 12 and a tube tail 13. The tube body 12 is the same length as the PVC sampling tube, and is provided with scale marking holes 15 and scale lines 16 at intervals of 10 cm; the tube head 11 is provided with a first through hole 14; and the tube tail 13 is an internal thread joint. A notch is provided on the upper part of the sampling tube storage tube 1 to facilitate the insertion and removal of the PVC sampling tube.

[0008] As a preferred solution, the drill bit 2 is divided into three functional parts, namely a soil-breaking blade 21 at the lower end, an external threaded joint 22 at the upper end, and a soil-guiding cavity 23. The soil-breaking blade 21 is designed to imitate a Luoyang shovel or a serrated shape, and its outer diameter is consistent with the outer diameter of the sampling tube storage tube 1 mentioned above; the height of the external threaded joint 22 is consistent with the height of the above-mentioned tube tail 13, and is matched with the inner thread of the above-mentioned tube tail 13; the diameter of the soil-guiding cavity 23 is consistent with the inner diameter of the PVC sampling tube.

[0009] As a preferred embodiment, the sealing film 3 is provided with an exhaust hole 32 and a sealing rubber head 31. The sealing rubber head 31 can be adapted to and inserted into the PVC sampling tube. The movable hole plug 4 can be adapted to and inserted into the exhaust hole 32. When the movable hole plug 4 is inserted into the exhaust hole 32 and the sealing rubber head 31 is inserted into one end of the PVC sampling tube, its sealing structure can effectively close the exhaust hole 32 and one end of the PVC sampling tube, preventing air from flowing through the exhaust hole 32 and one end of the PVC sampling tube.

[0010] As a preferred solution, the knocking cover 5 is provided with a second through hole 51, an observation hole 52, a slot 53 and a pressure head 54. The diameter of the second through hole 51 is slightly larger than the diameter of the first through hole 14, the slot 53 fits with the barrel head 11, and the outer diameter of the pressure head 54 is slightly smaller than the inner diameter of the sampling tube storage barrel 1. After being assembled with the sampling tube storage barrel 1, the second through hole 51 is aligned with the center of the first through hole 14.

[0011] As a preferred solution, the outer diameter of the pull rod 6 is slightly smaller than the diameter of the first through hole 14, and both ends are external threaded joints.

[0012] As a preferred solution, the inner thread of the handle 7 is designed to match the outer thread of the pull rod 6. The outer diameter of the handle 7 is larger than the diameter of the second through hole 51. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the sampling tube storage cylinder of the utility model;

[0015] Figure 3 This is a schematic diagram of the drill bit structure of the utility model;

[0016] Figure 4 It is a schematic diagram of the sealing film and movable hole plug structure of the utility model;

[0017] Figure 5 This is a schematic diagram of the knock cover structure of the utility model;

[0018] Figure 6 This is a schematic diagram of the pull rod and handle structure of the utility model.

[0019] In the figure: 1. Sampling tube storage tube; 2. Drill bit; 3. Sealing film; 4. Movable hole plug; 5. Knocking cover; 6. Pull rod; 7. Handle; 11. Tube head; 12. Tube body; 13. Tube tail; 14. First through hole; 15. Scale mark hole; 16. Scale line; 21. Soil breaking blade; 22. External thread joint; 23. Soil guide cavity; 31. Sealing rubber head; 32. Exhaust hole; 51. Second through hole; 52. Observation hole; 53. Slot; 54. Press head. DETAILED DESCRIPTION

[0020] Before sampling, connect the drill bit 2 with the sampling tube storage tube 1, place the PVC sampling tube in the sampling tube storage tube 1, and push it to the bottom of the sampling tube storage tube 1 to connect with the drill bit 2; insert the sealing film sealant head 31 into the PVC sampling tube, and the sealing film exhaust hole 32 is in an open state; cover the sampling tube storage tube 1 with the knocking cover 5 and press it, and align the second through hole 51 with the first through hole 14. Install the handle 7 on one side of the pull rod 6, and install the handle 7 after the other side passes through the second through hole 51; use a marker pen to make scale marks on the PVC sampling tube through the scale mark hole 15.

[0021] When sampling, point the drill bit 2 vertically downward, hold the handle 7 with both hands, rotate and press the PVC soil column sampler into the soil, and slowly hammer the cover 5 with a rubber hammer; the soil is introduced into the PVC sampling tube through the soil guide cavity 23, and the soil collection situation in the PVC sampling tube is observed through the observation hole 52 and the exhaust hole 32, and the scale line 16 is observed until the PVC sampling tube reaches the sampling depth.

[0022] When sampling, unscrew the handle 7 on one side of the pull rod 6, pull out the pull rod 6, remove the knocking cover 5, and insert the movable hole plug 4 into the exhaust hole 32. Cover the knocking cover 5 with the sampling tube storage tube 1 and compact it, align the second through hole 51 with the first through hole 14, pass the pull rod 6 through the second through hole 51, and then install the handle 7; hold the handle 7 with both hands to slowly rotate the PVC soil column sampler to pull out the soil, remove the pull rod 6 and the knocking cover 5, lay the sampling tube storage tube 1 flat, and slowly pull out the PVC sampling tube; scrape off the excess soil at the bottom of the PVC sampling tube, cover it with the matching cover and seal it with tape to ensure that the sample will not leak significantly from the bottom of the PVC sampling tube; remove the sealing film 3 on the top of the PVC sampling tube, cover it with the matching cover and seal it with tape, and the soil in the PVC sampling tube is the soil sample.

[0023] Working principle of the utility model: the utility model reduces the resistance of soil and vegetation roots through the soil-breaking blade 21; the diameter of the soil-guiding cavity 23 is consistent with the inner diameter of the PVC sampling tube, which is convenient for columnar soil to quickly enter the PVC sampling tube; the PVC sampling tube is built into the sampling tube storage tube 1, which is convenient for cleaning the PVC sampling tube and storing soil samples, reducing workload and saving time for continuous sampling; after the sampling tube storage tube 1 is covered with the knocking cover 5, the sampling tube storage tube 1 can be prevented from being deformed, and the PVC sampling tube can be prevented from sliding in the sleeve 2, and the pressure can be effectively transmitted to the drill bit 2 when the sampling hammer is struck; the sealing film 3 is provided with an exhaust hole 32, which opens when the PVC soil column sampler is rotated and pressed down, and gas can be discharged to reduce the downward pressure resistance of the sampler, and the soil collection situation inside the PVC sampling tube can be observed through the exhaust hole 32, which can play the role of a cushion layer for the PVC sampling tube when hammering; after reaching the sampling depth, it is plugged with a movable hole plug 4 to form a sealed environment to prevent the columnar soil in the PVC sampling tube from slipping.

[0024] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PVC soil column sampler capable of reducing vertical soil compression, comprising a sampling tube storage tube (1), a drill bit (2), a sealing film (3), a movable hole plug (4), a knocking cover (5), a pull rod (6) and a handle (7), characterized in that: The sampling tube storage tube (1) is designed to accommodate and protect the PVC sampling tube. The inner wall surface of the sampling tube storage tube (1) can fit tightly with the outer wall of the PVC sampling tube, and the friction coefficient is appropriate, so that the PVC sampling tube can be stably supported in the sampling tube storage tube (1) and can slide up and down smoothly. The upper part of the sampling tube storage tube (1) is provided with a notch to facilitate the insertion and removal of the PVC sampling tube. The sampling tube storage tube (1) is divided into a tube head (11), a tube body (12) and a tube tail (13). The tube head (11) is provided with a first through hole (14), which is provided with 4 holes and is evenly distributed around the tube head (11). The tube body (12) is the same length as the PVC sampling tube, and the outer wall is provided with scale marking holes (15) and scale lines (16) at intervals of 10 cm. The tube tail (13) is provided with an internal thread joint. The lower end of the sampling tube storage tube (1) is connected to a drill bit (2) through a tube tail (13). The drill bit (2) is structurally divided into three parts: a soil-breaking blade (21) at the lower end, an external screw thread connector (22) at the upper end, and a soil-guiding cavity (23). The soil-breaking blade (21) is designed to imitate a Luoyang shovel or a sawtooth shape, and its outer diameter is consistent with the outer diameter of the sampling tube storage tube (1). The height of the external screw thread connector (22) is consistent with the height of the tube tail (13), and is matched with the inner screw thread of the tube tail (13). The diameter of the soil-guiding cavity (23) is consistent with the inner diameter of the PVC sampling tube. The upper end of the sampling tube storage tube (1) is connected to a knocking cover (5) through a tube head (11); the knocking cover (5) is provided with a second through hole (51), an observation hole (52), a clamping groove (53) and a pressure head (54); the diameter of the second through hole (51) is slightly larger than the diameter of the first through hole (14); four of the second through holes (51) are provided and are evenly distributed around the knocking cover (5); the clamping groove (53) fits with the tube head (11); the outer diameter of the pressure head (54) is slightly smaller than the inner diameter of the sampling tube storage tube (1); after the knocking cover (5) and the sampling tube storage tube (1) are assembled, the second through hole (51) is aligned with the center of the first through hole (14).

2. A PVC soil column sampler capable of reducing soil vertical compression according to claim 1, characterized in that: The sealing film (3) is provided with an exhaust hole (32) and a sealing rubber head (31), and the sealing rubber head (31) can be adapted to and inserted into the PVC sampling tube. The movable hole plug (4) can be adapted to and inserted into the exhaust hole (32). When the movable hole plug (4) is inserted into the exhaust hole (32) and the sealing rubber head (31) is inserted into one end of the PVC sampling tube, its sealing structure can effectively seal the exhaust hole (32) and one end of the PVC sampling tube, thereby preventing air from flowing through the exhaust hole (32) and one end of the PVC sampling tube.

3. The PVC soil column sampler capable of reducing soil vertical compression according to claim 1, characterized in that: The outer diameter of the pull rod (6) is slightly smaller than the diameter of the first through hole (14), and both ends are external threaded joints.

4. The PVC soil column sampler capable of reducing soil vertical compression according to claim 1, characterized in that: The handle (7) is designed with two internal threads which match the external threads of the pull rod (6); the outer diameter of the handle (7) is greater than the diameter of the second through hole (51).

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