A direct push soil sampling drill and method of sampling

Abstract

The present application relates to a kind of direct-push soil sampling drill and its sampling method, direct-push soil sampling drill includes outer drill pipe, also include: inner drill rod, inner drill rod can be placed in outer drill pipe, inner drill rod can close outer drill pipe lower opening;Fishing lifting mechanism, fishing lifting mechanism can be placed in outer drill pipe and detachably connected to be placed in inner drill rod in outer drill pipe, fishing lifting mechanism is used to lift inner drill rod and separate from outer drill pipe, to open outer drill pipe lower opening;Sampling tube, sampling tube is located in outer drill pipe, sampling tube can be connected outer drill pipe lower opening and form soil passage.It has beneficial effect to simultaneously realize ground to underground and the sampling of two kinds of sampling mode after drilling underground certain depth.Sustained support outer drill pipe hole wall formed by drilling.To the depth to be sampled after drilling, fishing lifting mechanism will inner drill rod be lifted and separate from outer drill pipe, save the time of multiple connection and disassembly inner drill rod.Sampling is carried out by sampling tube, avoid outer drill pipe and the soil layer coated on outer drill pipe pollute soil sample.

Description

Technical Field

[0001] This invention relates to the field of sampling device technology, and in particular to a direct-push soil sampling drill and its sampling method. Background Technology

[0002] Environmental surveys involve sampling soil using drilling rigs and tools, analyzing the samples to obtain soil pollutant assessment data to determine the extent of pollution and support the development of environmental remediation plans. The sampling process requires strict control over soil sample disturbance and chemical interference; currently, a method combining static pressure direct thrust, impact vibration, and non-circulating fluid is commonly used for soil sampling.

[0003] Existing drilling tools generally include the following two types: The first type includes an external drill pipe and a sampling tube placed inside the external drill pipe.

[0004] The second type includes an outer drill pipe and an inner drill pipe placed inside the outer drill pipe.

[0005] When using the first type of drilling tool: During drilling, it is necessary to add and connect the outer drill pipe and sampling pipe one by one according to the sampling depth. After sampling is completed, it is still necessary to raise all the outer drill pipes and sampling pipes to the ground and disassemble the sampling pipes one by one to obtain the soil sample inside the sampling pipe. At the same time, this type of drilling tool can only achieve continuous sampling from the ground to the underground, and cannot directly achieve rapid sampling after drilling to a certain underground depth. That is, when it is necessary to obtain soil samples at an underground depth of ab, it is still necessary to continuously obtain soil samples from the ground to an underground depth of b.

[0006] When using the second type of drilling tool: During the drilling process, it is necessary to add and connect the outer drill pipe and inner drill rod one by one according to the sampling depth. When drilling reaches the sampling depth, all the outer drill pipes and inner drill rods need to be raised to the ground and disassembled one by one. Then, the multiple outer drill pipes are connected one by one and put into the drilled hole for sampling.

[0007] Therefore, both types of drilling tools require multiple deployments into the soil, with each outer drill pipe and sampling pipe or inner drill rod connected individually. The entire process of lifting and disassembling the outer drill pipe and sampling pipe or inner drill rod is complex, cumbersome, time-consuming, labor-intensive, and inefficient. Furthermore, when drilling through sandy and / or water-rich geological conditions, re-deploying the outer drill pipe after it has been raised to the surface can easily lead to soil collapse at the borehole wall, filling the borehole and creating soil layers of varying depths. When the outer drill pipe is deployed again, the soil layers within it can make it impossible to accurately determine the sampling depth. Additionally, outer drill pipes are generally made of metal, and some have a coating on their inner wall to improve mechanical and physical properties. Soil samples taken directly from the outer drill pipe are easily contaminated with the material of the outer drill pipe or the coating, interfering with the analysis and determination of pollutants in the soil sample. Summary of the Invention

[0008] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a direct-push soil sampling drill and its sampling method, which solves the technical problems of existing sampling drills that cannot simultaneously achieve sampling from the ground to the ground and sampling after drilling to a certain depth, do not require multiple lowering and connecting and multiple lifting and disassembling of the sampling tube and inner drill tube, do not require the outer drill tube to be removed during the entire sampling process, and require sampling to be performed by the sampling tube.

[0009] The sampling process, which requires multiple insertions and connection of the outer drill pipe, inner drill rod, and sampling pipe into the soil, followed by the complete lifting and disassembly of all components, is complex, cumbersome, time-consuming, labor-intensive, and inefficient. Furthermore, when drilling through areas with high sand and / or water content, lifting the outer drill pipe to the surface can easily lead to soil collapse at the borehole wall, filling the borehole and causing soil layering at different depths, making it impossible to accurately determine the sampling depth of the soil sample.

[0010] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by the present invention include: In a first aspect, embodiments of the present invention provide a direct-push soil sampling drill, including an outer drill pipe, and further comprising: An inner drill pipe, which can be placed inside the outer drill pipe, and which can close the lower opening of the outer drill pipe; A retrieval and lifting mechanism is provided, which can be placed inside the outer drill pipe and is detachably connected to the inner drill rod placed inside the outer drill pipe. The retrieval and lifting mechanism is used to lift the inner drill rod away from the outer drill pipe to open the lower opening of the outer drill pipe. A sampling tube is located inside the outer drill pipe, and the sampling tube is able to connect to the lower opening of the outer drill pipe to form a soil inlet channel.

[0011] According to the present invention, the outer drill pipe includes an outer tube body and an outer drill bit; The outer drill bit is a ring, and the upper part of the outer drill bit is inserted into and connected to the lower end of the outer tube body; The lower end of the sampling tube can abut against the top of the outer drill bit, and the upper end of the sampling tube can abut against the bottom of the seat ring located on the inner wall of the outer tube.

[0012] According to the present invention, it further includes a plug cone, which is disposed inside the sampling tube or the outer drill bit and is movable along the axial direction of the outer drill tube; When the inner drill pipe is placed inside the outer drill pipe, the inner drill pipe can press against the plug cone until the plug cone is located inside the outer drill bit, so as to close the lower opening of the outer drill bit; When the inner drill rod disengages from the outer drill pipe, the plug cone can enter the sampling tube and block the top of the soil sample inside the sampling tube.

[0013] According to the present invention, the conical end of the plugging cone can extend out of the lower opening of the outer drill bit; The inner wall of the external drill bit is stepped; The upper part of the plug cone extends outward in the radial direction to form an annular abutment portion, which can abut against the stepped surface of the inner wall of the outer drill bit.

[0014] According to the present invention, the internal drill pipe includes a rod body and a top cap connected to the lower end of the rod body; When the inner drill pipe is placed inside the outer drill pipe, the top cap can press against the top of the plug cone to press the plug cone into the outer drill bit.

[0015] According to the present invention, it also includes a one-way soil-feeding component; The one-way soil inlet is located in the lower cavity of the sampling tube. The one-way soil inlet allows soil to enter the sampling tube unidirectionally through the lower opening of the outer drill bit, and can receive the bottom of the soil sample in the sampling tube after sampling.

[0016] According to the present invention, the one-way soil entry component includes a connecting ring coaxially arranged with the sampling tube and located inside the sampling tube, and a plurality of arc-shaped strips spaced circumferentially along the connecting ring at the end of the connecting ring and extending toward the inner cavity of the sampling tube, wherein the opening formed by the plurality of arc-shaped strips can pass through the inner drill rod and the plug cone; The multiple arc-shaped strips can be compressed by the soil and open to allow soil to enter the sampling tube unidirectionally through the lower opening of the outer drill bit; and... The multiple arc-shaped strips can converge to receive the bottom of the soil sample in the sampling tube after sampling.

[0017] According to the present invention, the salvage and lifting mechanism includes a spring clip bracket joint assembly, which can be hung on the top of a seat ring located on the inner wall of the outer drill pipe; The spring clip bracket assembly can be threaded to the upper part of the inner drill rod, and turning the spring clip bracket assembly can drive the inner drill rod to rise and fall. The upper part of the inner drill rod is fitted with and threaded with a nut, which is located below the spring clip connector assembly; A spring washer is fitted onto the upper part of the inner drill rod, and the spring washer is located between the nut and the spring clip connector assembly.

[0018] According to the present invention, the spring clip holder assembly includes a spring clip holder connector and a spring clip holder, wherein the spring clip holder connector is detachably connected to the inner drill pipe; The lower part of the spring clip holder is detachably connected to the upper part of the spring clip holder connector. A suspension ring is sandwiched between the lower peripheral wall of the spring clip holder and the upper peripheral wall of the spring clip holder connector. The suspension ring can be hung on the top of the seat ring. The spring clip holder is a hollow cylindrical body. From top to bottom, spring clip limiting blocks and spring clip clamps are sequentially arranged within the spring clip holder. Each spring clip limiting block comprises two limiting blocks, which are inserted into an axially extending first elongated hole on the peripheral wall of the spring clip holder via pins. Each spring clip clamp comprises two clamp bodies, which are inserted into through holes on the peripheral wall of the spring clip holder via pins. The free ends of the two limiting blocks are hinged to the free ends of the two clamp bodies, one for each of them. The upper end of the spring sleeved on the outer periphery of the spring clip frame abuts against the spring baffle connected to the top of the spring clip frame, and the lower end of the spring abuts against the free ends of the two limiting blocks to drive the free ends of the two limiting blocks to open, so that the free ends of the two clamps can extend out of the second elongated hole located on the peripheral wall of the spring clip frame along its axial direction and extend into the spring clip chamber opened on the inner peripheral wall of the outer drill pipe. The salvage and lifting mechanism also includes: The retrieval tube is sleeved outside the spring clamp bracket. The peripheral wall of the retrieval tube extends axially and has an elongated hole for the free ends of the limiting blocks and the spring clamp to extend out. The pins inserted on the two limiting blocks are also inserted into the first through hole on the upper part of the peripheral wall of the retrieval tube. The spearhead is connected to the upper part of the recovery tube and to the lower part of the spearhead, which extends into and is connected to the top groove of the spearhead, and is used to wind the rope.

[0019] Secondly, the present invention also provides a sampling method for a direct-push soil sampling drill, comprising the following steps: When it is necessary to take samples from the ground to the subsurface, the following steps are included: A1: As the external drill pipe drills, soil enters the sampling pipe through the lower opening of the external drill pipe; When it is necessary to drill underground to take samples, the following steps are included: B1: Connect the retrieval and lifting mechanism to the upper part of the inner drill rod, and place the retrieval and lifting mechanism together with the inner drill rod inside the outer drill pipe, with the inner drill rod sealing the lower opening of the outer drill pipe; B2: The outer drill pipe and the inner drill rod are drilled synchronously to the sampling depth. The inner drill rod is lifted and detached from the outer drill pipe by the retrieval and lifting mechanism, and the lower opening of the outer drill pipe is opened. B3: The external drill pipe is drilled, and the soil enters the sampling pipe through the lower opening of the external drill pipe.

[0020] (III) Beneficial Effects The beneficial effects of this invention are as follows: The direct-push soil sampling drill and its sampling method provided by this invention can simultaneously achieve two sampling methods: sampling from the ground to the subsurface, and obtaining soil samples at the required sampling depth after drilling to a certain depth, thus meeting different sampling needs. Furthermore, the external drill pipe does not need to be pulled out of the ground during the entire sampling process. The external drill pipe continuously supports the borehole wall formed by drilling, avoiding soil collapse and filling of the borehole at different depths caused by raising the external drill pipe to the surface when drilling into sandy and / or water-rich geology. This ensures accurate acquisition of soil samples at the required sampling depth. Meanwhile, after drilling to the desired sampling depth, this direct-push soil sampling drill can easily and quickly detach the inner drill rod from the outer drill pipe via a retrieval and lifting mechanism. This eliminates the need for repeatedly connecting one or more inner drill rods to the top of the outer drill pipe to adapt to the sampling depth, and for individually disassembling all inner drill rods after lifting them to the ground to obtain samples. This saves time associated with repeatedly connecting and disassembling inner drill rods, thus simplifying the sampling process, improving sampling efficiency, and shortening sampling time. Furthermore, sampling via the sampling pipe avoids contamination of the soil sample by the outer drill pipe and the soil layer coated on it. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the direct-push soil sampling drill of the present invention; Figure 2 for Figure 1A schematic diagram of the one-way soil inlet component.

[0022] [Explanation of Labels in the Attached Image] 1: External drill pipe; 11: External pipe body; 111: Spring clip stop; 112: Spring clip chamber; 113: External drill bit; 114: Spring clip chamber; 12: External drill bit; 121: Step surface; 13: Seat ring; 2: Internal drill pipe; 21: Pipe body; 22: Top cap; 3: Salvage and lifting mechanism; 31: Spring clip holder connector assembly; 311: Spring clip holder connector; 312: Spring clip holder; 3121: First elongated hole; 313: Suspension ring; 314: Spring clip limit block; 3141: Limit block; 315: Spring clip clamp; 316: Spring baffle; 317: Recovery tube; 3171: Elongated hole in recovery tube; 32: Salvage spearhead seat; 321: Top groove; 322: Elongated hole in salvage spearhead seat; 323: Salvage spearhead seat pin; 33: Salvage spearhead; 34: Positioning stop pin; 35: Positioning spring; 36: Salvage spearhead pin; 37: Spring; 38: Nut; 39: Spring washer; 4: Core-plugging cone; 41: Sealing element; 42: Annular abutment part; 5: One-way soil entry component; 51: Connecting ring; 52: Arc-shaped strip; 6: Sampling tube. Detailed Implementation

[0023] To better explain and facilitate understanding of the present invention, a detailed description of the invention is provided below with reference to the accompanying drawings and specific embodiments. In this document, directional terms such as "upper" and "lower" are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0024] See Figure 1-2 The present invention provides a direct-push soil sampling drill, which includes an outer drill pipe 1, an inner drill rod 2, a retrieval and lifting mechanism 3, and a sampling pipe 6.

[0025] The inner drill rod 2 can be placed inside the outer drill pipe 1, and the inner drill rod 2 can close the lower opening of the outer drill pipe 1. The retrieval and lifting mechanism 3 can be placed inside the outer drill pipe 1 and is detachably connected to the inner drill rod 2 placed inside the outer drill pipe 1. The retrieval and lifting mechanism 3 is used to lift the inner drill rod 2 out of the outer drill pipe 1 to open the lower opening of the outer drill pipe 1. The sampling tube 6 is located inside the outer drill pipe 1, and the sampling tube 6 can connect to the lower opening of the outer drill pipe 1 to form a soil inlet channel.

[0026] Furthermore, the sampling method of the direct-push soil sampling drill of the present invention includes the following steps: When it is necessary to take samples from the ground to the subsurface, the following steps are included: A1: The outer drill pipe 1 is drilled in, and the soil enters the sampling pipe 6 through the lower opening of the outer drill pipe 1, and is sampled by the sampling pipe 6.

[0027] When it is necessary to drill underground to take samples, the following steps are included: B1: Connect the retrieval and lifting mechanism 3 to the upper part of the inner drill rod 2, and place the retrieval and lifting mechanism 3 together with the inner drill rod 2 inside the outer drill pipe 1, with the inner drill rod 2 sealing the lower opening of the outer drill pipe 1; B2: The outer drill pipe 1 and the inner drill rod 2 are drilled synchronously to the sampling depth. The inner drill rod 2 is lifted off the outer drill pipe 1 by the retrieval and lifting mechanism 3, and the lower opening of the outer drill pipe 1 is opened. B3: The outer drill pipe 1 is drilled in, and the soil enters the sampling pipe 6 through the lower opening of the outer drill pipe 1 and is sampled by the sampling pipe 6.

[0028] This invention provides a direct-push soil sampling drill and its sampling method, which can simultaneously perform sampling operations from the surface to the ground, and obtain soil samples at the required sampling depth after drilling to a certain depth, thus meeting different sampling needs. Furthermore, the outer drill pipe 1 does not need to be pulled out of the ground during the entire sampling process. The outer drill pipe 1 continuously supports the borehole wall formed by drilling, avoiding soil collapse and soil layering at different depths caused by raising the outer drill pipe 1 to the surface when drilling into sandy and / or water-rich geology. This ensures accurate acquisition of soil samples at the required sampling depth. Meanwhile, after drilling to the desired sampling depth, this direct-push soil sampling drill can easily and quickly lift the inner drill rod 2 away from the outer drill pipe 1 via the retrieval and lifting mechanism 3. This eliminates the need to repeatedly connect one or more inner drill rods 2 to the top of the inner drill rod 2 to adapt to the sampling depth, and to individually disassemble all inner drill rods 2 after lifting them to the ground to obtain samples. This saves time associated with repeatedly connecting and disassembling the inner drill rods 2, thus simplifying the sampling process, improving sampling efficiency, and shortening sampling time. Furthermore, sampling via the sampling tube 6 avoids the outer drill pipe 1 and its coating from being mixed with the soil sample, thus preventing interference with the determination of metal components in contaminated soil samples.

[0029] Preferably, the sampling tube 6 is made of PVC (polyvinyl chloride), which will not affect the determination of the metal components in the soil sample of the contaminated soil.

[0030] Specifically, two adjacent external drill pipes 1 are threaded together.

[0031] Furthermore, the outer drill pipe 1 includes an outer pipe body 11 and an outer drill bit 12.

[0032] The outer drill bit 12 is an annular shape and is used for drilling. The upper part of the outer drill bit 12 is inserted into and connected to the lower end of the outer tube 11. The lower end of the sampling tube 6 can abut against the top of the outer drill bit 12, and the upper end of the sampling tube 6 can abut against the bottom of the seat ring 13 located on the inner wall of the outer tube 11, so as to limit the vertical position of the sampling tube 6 relative to the outer drill tube 1.

[0033] Specifically, the outer drill bit 12 is tapered, and its upper end extends upward to form an annular connecting portion. The connecting portion is used for detachable connection with the outer drill pipe 1 for easy maintenance and disassembly. Preferably, the connecting portion has an external thread, is inserted into the lower end of the outer drill pipe 1, and is threadedly connected to the lower end of the outer drill pipe 1; alternatively, the connecting portion has an internal thread, is fitted onto the lower end of the outer drill pipe 1, and is threadedly connected to the lower end of the outer drill pipe 1.

[0034] Specifically, the outer tube body 11 comprises, from top to bottom, a spring-loaded stop head 111, a spring-loaded chamber 112, and an outer drill bit 113, all of which are annular and connected by threads. The lower end of the spring-loaded stop head 111 and the inner peripheral wall of the spring-loaded chamber 112 form an annular spring-loaded chamber 114. The lower end of the spring-loaded chamber 112 and the inner peripheral wall of the outer drill bit 113 form an annular seat ring cavity for accommodating the seat ring 13.

[0035] Furthermore, the direct-push soil sampling drill of the present invention also includes a core-plugging cone 4, which is movably disposed within the sampling tube 6 or the outer drill bit 12 along the axial direction of the outer drill tube 1.

[0036] When the inner drill pipe 2 is placed inside the outer drill pipe 1, the inner drill pipe 2 can press against the plug cone 4 until the plug cone 4 is located inside the outer drill bit 12, so as to close the lower opening of the outer drill bit 12.

[0037] When the inner drill rod 2 disengages from the outer drill pipe 1, the plug cone 4 can enter the sampling tube 6 and block the top of the soil sample inside the sampling tube 6. Specifically, when the outer drill pipe 1 drills, the soil squeezes the plug cone 4 and presses the plug cone 4 into the sampling tube 6 until the top of the sampling tube 6 is reached, and the plug cone 4 can block the top of the soil sample inside the sampling tube 6.

[0038] Specifically, the cone end of the plugging cone 4 can extend out of the lower opening of the outer drill bit 12 and drill synchronously with the outer drill bit 12.

[0039] Preferably, one or more sealing elements 41 are fitted onto the circumferential wall of the plugging cone 4. The sealing elements 41 are used to seal the gap between the circumferential wall of the plugging cone 4 and the inner wall of the outer drill bit 12, preventing soil from entering the gap between the circumferential wall of the plugging cone 4 and the inner wall of the outer drill bit 12. Optionally, the sealing element 41 is an O-ring or other sealing element.

[0040] Specifically, the inner wall of the outer drill bit 12 is stepped. The upper part of the plug cone 4 extends outward in the radial direction to form an annular abutment part 42, which can abut against the stepped surface 121 of the inner wall of the outer drill bit 12, preventing the plug cone 4 from moving down and detaching from the outer drill bit 12.

[0041] Furthermore, the internal drill pipe 2 includes a pipe body 21 and a cap 22 connected to the lower end of the pipe body 21.

[0042] When the inner drill pipe 2 is placed inside the outer drill pipe 1, the top cap 22 can press against the top of the plug cone 4 to press the plug cone 4 into the outer drill bit 12.

[0043] Furthermore, the direct-push soil sampling drill of the present invention also includes a one-way soil inlet component 5.

[0044] The one-way soil inlet 5 is installed in the lower cavity of the sampling tube 6. The one-way soil inlet 5 allows the soil to enter the sampling tube 6 from the lower opening of the outer drill bit 12 in one direction. It can also receive the bottom of the soil sample in the sampling tube 6 after sampling, so as to prevent the soil sample from falling out when it is taken out of the sampling tube 6.

[0045] Specifically, the one-way soil entry component 5 includes a connecting ring 51 coaxially arranged with the sampling tube 6 and located inside the sampling tube 6, and a plurality of arc-shaped strips 52 spaced circumferentially along the end of the connecting ring 51 and extending toward the inner cavity of the sampling tube 6. The opening formed by the plurality of arc-shaped strips 52 can pass through the inner drill rod 2 and the plug cone 4.

[0046] Multiple arc-shaped strips 52 can be opened by soil compression so that soil enters the sampling tube 6 unidirectionally from the lower opening of the outer drill bit 12; and multiple arc-shaped strips 52 can be closed to receive the bottom of the soil sample in the sampling tube 6 after sampling.

[0047] More specifically, the connecting ring 51 of the one-way soil inlet 5 is inserted into the sampling tube 6, and the connecting ring 51 and the sampling tube 6 are interference fit.

[0048] Furthermore, the salvage and lifting mechanism 3 includes a spring clip connector assembly 31.

[0049] The spring clip connector assembly 31 can be hung on the top of the seat ring 13 located on the inner wall of the outer drill pipe 1. The spring clip connector assembly 31 can be threaded to the upper part of the inner drill pipe 2. Tightening the spring clip connector assembly 31 can drive the inner drill pipe 2 to rise and fall, so that the top cap 22 of the inner drill pipe 2 can press against the top of the plug cone 4, and can adjust the length of the plug cone 4 protruding from the outer drill bit 12.

[0050] Specifically, the upper part of the inner drill rod 2 is provided with an external thread, and the spring clip connector assembly 31 can be sleeved and threadedly connected to the upper part of the inner drill rod 2; or, the upper part of the inner drill rod 2 is provided with an internal thread, and the lower part of the spring clip connector assembly 31 is provided with an external thread, and the spring clip connector assembly 31 can be inserted into and threadedly connected to the upper part of the inner drill rod 2.

[0051] Specifically, a nut 38 is threaded onto and fitted onto the upper part of the inner drill rod 2. The nut 38 is located below the spring clip connector assembly 31. The nut 38 serves to prevent loosening when the spring clip connector assembly 31 and the upper part of the inner drill rod 2 are connected, providing double protection. A spring washer 39 is fitted onto the upper part of the inner drill rod 2. The spring washer 39 is located between the nut 38 and the spring clip connector assembly 31. The spring washer 39 serves to prevent loosening between the spring clip connector assembly 31 and the nut 38.

[0052] Furthermore, the spring clip holder assembly 31 includes a spring clip holder connector 311 and a spring clip holder 312, with the spring clip holder connector 311 being detachably connected to the inner drill pipe 2.

[0053] The lower part of the spring clip holder 312 is detachably connected to the upper part of the spring clip holder connector 311. A suspension ring 313 is sandwiched between the lower peripheral wall of the spring clip holder 312 and the upper peripheral wall of the spring clip holder connector 311. The suspension ring 313 can be hung on the top of the seat ring 13 to restrict the downward movement of the retrieval lifting mechanism 3.

[0054] The spring clip holder 312 is a hollow cylinder. From top to bottom, spring clip limiting blocks 314 and spring clip clamps 315 are arranged inside the spring clip holder 312. The spring clip limiting block 314 includes two limiting blocks 3141, which are inserted into the first elongated hole 3121 extending axially on the peripheral wall of the spring clip holder 312 by means of pins. The spring clip clamp 315 includes two clamp bodies, which are inserted into the through holes on the peripheral wall of the spring clip holder 312 by means of pins. The free ends of the two limiting blocks 3141 are hinged to the free ends of the two clamp bodies one by one. The two limiting blocks 3141 and the two clamp bodies form a four-bar linkage mechanism. The upper end of the spring 37, which is sleeved on the outer periphery of the spring clip holder 312, abuts against the spring baffle 316 on the top of the spring clip holder 312. The lower end of the spring 37 abuts against the free ends of the two limiting blocks 3141 to drive the free ends of the two limiting blocks 3141 to open, so that the free ends of the two clamps can extend out of the second elongated hole located on the peripheral wall of the spring clip holder 312 along its axial direction and extend into the annular spring clip chamber 114 opened on the inner peripheral wall of the outer drill pipe 1. When the spring clip clamp 315 is located in the spring clip chamber 114, the spring clip chamber 114 can restrict the upward movement of the spring clip clamp 315, thereby restricting the upward movement of the retrieval and lifting mechanism 3, and preventing the inner drill rod 2 from pressing upward on the retrieval and lifting mechanism 3 during drilling, causing the retrieval and lifting mechanism 3 to shift and detach from the outer drill pipe 1.

[0055] Thus, the downward movement of the salvage and lifting mechanism 3 is restricted by the suspension ring 313, and the upward movement of the salvage and lifting mechanism 3 is restricted by the top wall of the spring clip chamber 114, so as to achieve the upper and lower limits of the salvage and lifting mechanism 3 in the axial direction.

[0056] Specifically, the spring baffle 316 is detachably connected to the top of the spring clip holder 312 by bolts.

[0057] Furthermore, the salvage and lifting mechanism 3 also includes a recovery pipe 317.

[0058] The recovery tube 317 is sleeved outside the spring clip holder 312. The peripheral wall of the recovery tube 317 extends axially and has an elongated recovery tube hole 3171 for the free ends of the limiting block 3141 and the spring clip 315 to extend out. The pins inserted on the two limiting blocks 3141 are also inserted into the first through hole in the middle of the peripheral wall of the recovery tube 317.

[0059] Furthermore, the salvage and lifting mechanism 3 also includes a spearhead base 32 and a spearhead 33.

[0060] The spearhead 32 is connected to the upper part of the recovery tube 317 and the spearhead 33 extends into and is connected to the top groove 321 of the spearhead 32. The spearhead 33 is used to wrap the rope.

[0061] Specifically, a positioning pin 34 is provided in the top groove 321. The top of the positioning pin 34 abuts against the bottom plane of the retrieval spearhead 33 so that the retrieval spearhead 33 can move vertically when the retrieval lifting mechanism 3 is lifted, preventing the retrieval spearhead 33 from rotating left and right, thereby improving the success rate of lifting the retrieval lifting mechanism 3.

[0062] Specifically, a positioning spring 35 is fitted around the outer periphery of the positioning pin 34. The top end of the positioning spring 35 abuts against the bottom end of the pin head of the positioning pin 34, and the bottom end of the positioning spring 35 abuts against the bottom wall of the top groove 321. The positioning spring 35 is in a pre-tightened state, which can apply an upward pre-tightening force to the positioning pin 34 so that the top end of the positioning pin 34 abuts against the bottom plane of the spearhead 33.

[0063] Specifically, the lower part of the spearhead 33 extends into the top groove 321 of the spearhead holder 32 and is connected by a pin.

[0064] Specifically, the lower peripheral wall of the spearhead holder 32 has an elongated spearhead holder hole 322 extending along its axial direction, and the upper peripheral wall of the recovery tube 317 has a second through hole. After the lower part of the spearhead holder 32 is inserted into the upper part of the recovery tube 317, the elongated spearhead holder hole 322 and the second through hole on the recovery tube 317 are aligned and a spearhead holder pin 323 is inserted to connect the spearhead holder 32 to the upper part of the recovery tube 317.

[0065] When the spearhead 33 is lifted upward, the spearhead 33 drives the spearhead seat 32 to move upward. After the spearhead seat pin 323 abuts against the elongated hole 322, the spearhead seat 32 drives the recovery tube 317 to move upward simultaneously.

[0066] Specifically, the principle by which the retrieval and lifting mechanism 3 drives the inner drill rod 2 to detach from the outer drill pipe 1 is as follows: First, the rope on the hoisting and lowering rope retrieval device of the drilling rig is wound and fixed to the retrieval head 33. Then, the hoisting and lowering rope retrieval device pulls the rope upward, and the rope lifts the retrieval head 33. The retrieval head 33 drives the retrieval head seat 32 upward. After the retrieval head seat pin 323 abuts against the elongated hole 322 of the retrieval head seat, the retrieval head seat 32 drives the recovery pipe 317 upward synchronously. At the same time as the recovery pipe 317 moves upward, it drives the two limiting blocks 3141, which are inserted into the first through hole on the peripheral wall of the recovery pipe 317 through the pin, to move upward. The free ends of the two limiting blocks 3141 retract inward under the gravity of the two clamps, and the free ends of the two clamps rotate and disengage from the spring clamp chamber 114. Then, the spring clamp clamp 315 drives the spring clamp frame 312, the spring clamp frame connector 311, and the inner drill rod 2 connected to the spring clamp frame connector 311 to move upward synchronously to disengage from the outer drill pipe 1. Therefore, the hoisting device of the drilling rig lowers the rope to pull the rope to lift the retrieval mechanism 3, so as to conveniently and quickly detach the inner drill rod 2 from the outer drill pipe 1. Compared with the method of continuously lifting and unscrewing multiple sampling tubes 6, the sampling efficiency is greatly improved, and the sampling tube 6 can be conveniently and quickly put into the outer drill pipe 1 through the retrieval mechanism 3.

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A direct push soil sampling drill comprising an outer drill tube (1), characterised in that, The outer drill pipe (1) includes an outer tube body (11) and an outer drill bit (12); the outer drill bit (12) is an annular body, the outer drill bit (12) is used for drilling, and the upper part of the outer drill bit (12) is inserted into and connected to the lower end of the outer tube body (11); Also includes: The inner drill rod (2) can be placed inside the outer drill pipe (1), the inner drill rod (2) can close the lower opening of the outer drill pipe (1), and the outer drill pipe (1) and the inner drill rod (2) can drill synchronously to the depth to be sampled. The retrieval and lifting mechanism (3) is capable of being placed inside the outer drill pipe (1) and detachably connected to the inner drill rod (2) placed inside the outer drill pipe (1). The retrieval and lifting mechanism (3) is used to lift the inner drill rod (2) away from the outer drill pipe (1) to open the lower opening of the outer drill pipe (1). The sampling tube (6) is fixed inside the outer drill pipe (1). The lower end of the sampling tube (6) can abut against the top of the outer drill bit (12), and the upper end of the sampling tube (6) can abut against the bottom of the seat ring (13) located on the inner wall of the outer pipe body (11). The sampling tube (6) can connect to the lower opening of the outer drill pipe (1) and form a soil inlet channel. When the lower opening of the outer drill pipe (1) is opened, the drilling of the outer drill pipe (1) can drive the sampling tube (6) to take a sample. A plugging cone (4) is disposed inside the sampling tube (6) or the external drill bit (12) and is movable along the axial direction of the external drill pipe (1). When the inner drill rod (2) is placed inside the outer drill pipe (1), the inner drill rod (2) can press against the plug cone (4) until the plug cone (4) is located inside the outer drill bit (12) to close the lower opening of the outer drill bit (12). The cone end of the plug cone (4) can extend out of the lower opening of the outer drill bit (12) and drill synchronously with the outer drill bit (12). When the inner drill rod (2) is disengaged from the outer drill pipe (1), the plug cone (4) can enter the sampling tube (6) and block the top of the soil sample in the sampling tube (6); The direct-push soil sampling drill is used to perform sampling operations from the ground to the underground, and to obtain soil samples at the required sampling depth after drilling to a certain depth underground.

2. The straight push soil sampling auger of claim 1, wherein, The cone end of the plug cone (4) can extend out of the lower opening of the outer drill bit (12); The inner wall of the outer drill bit (12) is stepped; The upper part of the plug cone (4) extends outward in the radial direction to form an annular abutment part (42), which can abut against the stepped surface (121) of the inner wall of the outer drill bit (12).

3. The straight push soil sampling auger of claim 1, wherein, The inner drill pipe (2) includes a rod body (21) and a cap (22) connected to the lower end of the rod body (21); When the inner drill pipe (2) is placed inside the outer drill pipe (1), the top cap (22) can press against the top of the plug cone (4) to press the plug cone (4) into the outer drill bit (12).

4. The straight push soil sampling auger of claim 1, wherein, It also includes a one-way soil entry component (5); The one-way soil inlet (5) is located in the lower cavity of the sampling tube (6). The one-way soil inlet (5) allows soil to enter the sampling tube (6) unidirectionally through the lower opening of the outer drill bit (12), and can receive the bottom of the soil sample in the sampling tube (6) after sampling.

5. The straight push soil sampling auger of claim 4, wherein, The one-way soil entry component (5) includes a connecting ring (51) coaxially arranged with the sampling tube (6) and located inside the sampling tube (6), and a plurality of arc-shaped strips (52) spaced circumferentially along the connecting ring (51) at the end of the connecting ring (51) and extending toward the inner cavity of the sampling tube (6). The opening formed by the plurality of arc-shaped strips (52) can pass through the inner drill rod (2) and the plug cone (4). The plurality of said arc-shaped strips (52) can be opened by soil compression so that soil enters the sampling tube (6) unidirectionally through the lower opening of the outer drill bit (12); and, The multiple arc-shaped strips (52) can be closed to receive the bottom of the soil sample in the sampling tube (6) after sampling.

6. The straight push soil sampling auger of claim 1, wherein, The salvage and lifting mechanism (3) includes a spring clip bracket connector assembly (31), which can be hung on the top of the seat ring (13) located on the inner wall of the outer drill pipe (1); The spring clip bracket assembly (31) can be threaded to the upper part of the inner drill rod (2), and turning the spring clip bracket assembly (31) can drive the inner drill rod (2) to rise and fall. The upper part of the inner drill rod (2) is fitted with and threaded with a nut (38), and the nut (38) is located below the spring clip connector assembly (31); A spring washer (39) is fitted on the upper part of the inner drill rod (2), and the spring washer (39) is located between the nut (38) and the spring clip connector assembly (31).

7. The straight push soil sampling auger of claim 6, wherein, The spring clip holder connector assembly (31) includes a spring clip holder connector (311) and a spring clip holder (312), wherein the spring clip holder connector (311) is detachably connected to the inner drill rod (2); The lower part of the spring clip holder (312) is detachably connected to the upper part of the spring clip holder connector (311). A suspension ring (313) is sandwiched between the lower peripheral wall of the spring clip holder (312) and the upper peripheral wall of the spring clip holder connector (311). The suspension ring (313) can be hung on the top of the seat ring (13). The spring clip holder (312) is a hollow cylinder. Spring clip limiting blocks (314) and spring clip clamps (315) are arranged sequentially from top to bottom inside the spring clip holder (312). The spring clip limiting block (314) includes two limiting blocks (3141), which are inserted into the first elongated hole (3121) extending axially on the peripheral wall of the spring clip holder (312) by means of a pin. The spring clip clamp (315) includes two clamp bodies, which are inserted into the through hole on the peripheral wall of the spring clip holder (312) by means of a pin. The free ends of the two limiting blocks (3141) are hinged to the free ends of the two clamp bodies respectively. The upper end of the spring (37) sleeved on the outer periphery of the spring clip frame (312) abuts against the spring baffle (316) connected to the top of the spring clip frame (312), and the lower end of the spring (37) abuts against the free ends of the two limiting blocks (3141) to drive the free ends of the two limiting blocks (3141) to open, so that the free ends of the two clamps can extend out of the second elongated hole located on the peripheral wall of the spring clip frame (312) along its axial direction and extend into the spring clip chamber (114) opened on the inner peripheral wall of the outer drill pipe (1); The salvage and lifting mechanism (3) also includes: A recovery tube (317) is sleeved outside the spring clip holder (312). The peripheral wall of the recovery tube (317) extends axially and has an elongated hole (3171) for the free ends of the limiting block (3141) and the spring clip (315) to extend out. The pins inserted on the two limiting blocks (3141) are also inserted into the first through hole on the upper part of the peripheral wall of the recovery tube (317). The spearhead seat (32) connected to the upper part of the recovery tube (317) and the spearhead (33) extending into and connected to the top groove (321) of the spearhead seat (32) at the lower part, the spearhead (33) being used to wrap the rope.

8. A method of sampling with a direct push soil sampling drill according to any one of claims 1-7, characterized in that, Includes the following steps: When it is necessary to take samples from the ground to the subsurface, the following steps are included: A1: The outer drill pipe (1) drills in, and the soil enters the sampling pipe (6) through the lower opening of the outer drill pipe (1); When it is necessary to drill underground to take samples, the following steps are included: B1: Connect the retrieval and lifting mechanism (3) to the upper part of the inner drill rod (2), and place the retrieval and lifting mechanism (3) together with the inner drill rod (2) inside the outer drill pipe (1), with the inner drill rod (2) closing the lower opening of the outer drill pipe (1); B2: The outer drill pipe (1) and the inner drill rod (2) are drilled synchronously to the sampling depth. The inner drill rod (2) is lifted by the retrieval and lifting mechanism (3) and detached from the outer drill pipe (1). The lower opening of the outer drill pipe (1) is opened. B3: The outer drill pipe (1) drills in, and the soil enters the sampling pipe (6) through the lower opening of the outer drill pipe (1).

Images