Low-disturbance combined ground breaking drilling tool for engineering quality detection

Abstract

The invention belongs to the technical field of engineering quality detection, and discloses a low-disturbance combined ground breaking drilling tool for engineering quality detection, which comprises a connector connected with a power end, the connector is connected with a sampling mechanism, the sampling mechanism is connected with a ground breaking mechanism, and in the engineering quality detection, low-disturbance sampling is the key to guarantee the accuracy of detection data; in engineering quality detection, low-disturbance sampling is the key of accuracy of detection data; an existing drilling tool depends on redundant assemblies, is complex in structure, high in machining and maintenance cost and large in assembly error, stress is concentrated during rotation, large-amplitude swing is prone to occurring, hole walls and soil samples are squeezed and rubbed, and the original structure of the drilling tool is damaged. According to the drilling tool, modular pure mechanical design is adopted, the structure is simplified, and cost is reduced; spiral ribs and a soil unloading groove prevent soil from being gathered and extruded, and disturbance is reduced; an air eliminating hole balances pressure, and a hinged baffle and a baffle ring are automatically closed to keep a soil sample complete; the magnetic connector and the convenient soil sampling structure improve efficiency, low-disturbance sampling is achieved in the whole process, and it is ensured that detection data are reliable.

Description

Technical Field

[0001] This invention belongs to the field of engineering quality testing technology, and specifically relates to a low-disturbance combined soil breaking drill for engineering quality testing. Background Technology

[0002] In the field of engineering quality testing, the original structural integrity of soil samples directly determines the accuracy of test data, and low-disturbance sampling is a core prerequisite for ensuring reliable test results. Existing soil-breaking drills, in pursuit of low-disturbance effects, often employ multiple sets of hydraulic drive components, electronic control modules, and redundant linkage mechanisms, resulting in an overly complex overall structural design. This not only requires high-precision machining processes to match the assembly accuracy of each component but also necessitates additional auxiliary structures such as seals and vibration damping, significantly increasing the processing difficulty and manufacturing cost of the drill. Furthermore, the numerous parts also increase the risk of assembly errors, hindering mass production and on-site maintenance.

[0003] However, existing complex drilling tools still have key technical defects in practical applications: due to the uneven stiffness distribution of each functional module, the transmission of torque and axial force is prone to imbalance when the drilling tool rotates, causing stress concentration and resulting in a large radial oscillation of the drilling tool. This oscillation not only damages the verticality of the borehole, but also causes severe compression and friction disturbance to the soil in the borehole wall, resulting in changes in the particle arrangement and pore structure of the reserved soil sample, which seriously affects the authenticity of the test data. At the same time, the additional stress generated by the oscillation will aggravate the wear of the drilling tool components, shorten the service life, and make it difficult to reliably meet the actual needs of engineering quality testing for low-disturbance and high-precision sampling. Summary of the Invention

[0004] In view of the problems raised in the background art above, the purpose of this invention is to provide a low-disturbance combined soil breaking drill for engineering quality inspection.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A low-disturbance combined soil-breaking drill for engineering quality inspection includes a connector connected to a power end, the connector being connected to a sampling mechanism, and the sampling mechanism being connected to a soil-breaking mechanism. The sampling mechanism includes a hollow sampling tube with a hinged column installed inside. The two ends of the hinged column are symmetrically hinged with baffles. The specifications and dimensions of the two baffles are adapted to the sampling tube. A retaining ring is installed inside the sampling tube at the lower side of the hinged column. When the baffle contacts the retaining ring, the baffle is in a horizontal state. The soil breaking mechanism includes a hollow soil breaking tube, which is connected to the sampling tube. A drill bit is installed at the soil entry end of the soil breaking tube, and the drill bit is hollow inside. The drill bit, the soil breaking tube, and the sampling tube have the same inner diameter, and they rotate synchronously.

[0006] Furthermore, the sampling tube is equipped with a degassing hole to prevent the sample from being excessively compressed and thus damaging its true structure due to redundant accumulation inside the sampling tube.

[0007] Furthermore, the sampling tube has an internally threaded plug at the end furthest from the drill bit. The plug seals one end of the sampling tube and is fixedly connected to a screw plate. By removing the plug, the soil sample inside can be easily extracted.

[0008] Furthermore, an inclined guide plate is integrally connected inside the sampling tube to the lower side of the retaining ring to guide the soil sample.

[0009] Furthermore, the hinged column is equipped with a limiter, which prevents the two baffles from fully fitting together. This prevents the soil sample's own weight from forcing the two baffles back to their original position and contacting the side retaining ring when the drill bit is pulled upwards, thus achieving a sealing effect.

[0010] Furthermore, the outer side of the soil-breaking tube is integrally connected with spiral ribs to assist in breaking the soil and spreading the soil samples on both sides, prevent the soil samples inside the soil-breaking tube from being squeezed, and ensure the true state of the soil samples entering the sampling tube.

[0011] Furthermore, the drill bit, the soil breaking pipe, and the sampling pipe are connected to each other by threads, and the helical direction of the thread locking is the same as the rotation direction during operation. The threaded connection has high strength and is easy to disassemble. The same rotation direction ensures that it is in a state of tightening as it is turned during operation without coming apart.

[0012] Furthermore, the drill bit is evenly provided with soil-penetrating claws, and a soil-discharging groove is provided between two adjacent soil-penetrating claws. The soil-penetrating claws ensure the soil penetration effect, and the soil-discharging groove guides the soil, causing the soil to move to the outside of the drill bit and not to accumulate in the center, thereby preventing the soil sample entering the soil-breaking tube from being compressed and ensuring the authenticity of the soil sample.

[0013] Further defining the drill bit, it is composed of multiple parts spliced ​​together, starting from the entry end, consisting of a pilot helical cutting edge, a main helical cutting tooth, and a helical centering wing. This triple helical structure forms a complete "cutting-conveying-connection" system: the head helical cutting and guiding system is responsible for efficiently breaking up the formation and maintaining direction; the middle helical chip removal / pressure reduction system simultaneously removes the chips and maintains pressure balance within the hole; and the tail helical connection and locking system ensures a stable connection and power transmission between the drill bit and the drill rod. This triple helical connection structure design enables the drill bit to maintain a stable and efficient working state under complex geological conditions, while extending its service life.

[0014] Furthermore, the connector is a hexahedral connector and is magnetic. The hexahedral structure ensures accurate transmission of rotational force, and the magnetism enables quick insertion and connection.

[0015] The beneficial effects of using the present invention are as follows: In this invention, the drill bit adopts a modular threaded connection of connector, sampling mechanism and soil breaking mechanism, combined with a simplified pure mechanical linkage structure, which reduces redundant components and high-precision assembly requirements, reduces processing difficulty and manufacturing cost, and is convenient to disassemble and maintain, which is conducive to mass production. At the same time, the simple structure makes the stiffness distribution more uniform. Combined with the design that the inner diameters of the three are the same and rotate synchronously, stress concentration during rotation is avoided, the radial swing of the drill bit is reduced, and the disturbance to the borehole wall is reduced from the root.

[0016] The drill bit of this invention can adopt a triple helical structure, a soil-breaking tube helical rib and a centering design, and the inner diameter of the three is the same and they rotate synchronously, which optimizes the distribution of structural stiffness, avoids stress concentration during rotation, reduces radial oscillation of the drill bit, reduces disturbance to the borehole wall, and ensures the original state of the soil in the sampling area.

[0017] The structural design of this invention uses soil-entry claws, soil-discharging grooves, and spiral ribs to work together to prevent soil accumulation and compression, degassing holes to balance pressure, and baffles, retaining rings, and limiters to ensure reliable sealing after sampling. The multiple structures work together to ensure the integrity of the original soil sample structure and improve the accuracy of test data. Attached Figure Description

[0018] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of a low-disturbance combined soil-breaking drill bit embodiment of the present invention for engineering quality detection; Figure 2 This is a schematic cross-sectional view of an embodiment of a low-disturbance combined earth-breaking drill for engineering quality inspection according to the present invention. Figure 3 This is a schematic diagram of the transformation structure of the baffle in an embodiment of a low-disturbance combined soil-breaking drill for engineering quality inspection according to the present invention. Figure 4 This is a schematic diagram of the drill bit under the triple structure of an embodiment of a low-disturbance combined soil-breaking drill for engineering quality inspection according to the present invention. The symbols for the main components are explained below: Connector 1; Sampling mechanism 2; Soil breaking mechanism 3; Sampling tube 21; hinged post 22; baffle 23; retaining ring 24; degassing hole 25; plug 26; screw plate 27; inclined guide plate 28; 31. Soil-breaking pipe; 32. Drill bit; 33. Spiral rib; 321 soil entry claw; 322 soil unloading trough; 3201 pilot helix cutting edge; 3202 main helix cutting tooth; 3203 helix centering wing. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figures 1-4 As shown, a low-disturbance combined soil-breaking drill for engineering quality inspection according to the present invention includes a connector 1 connected to the power end, a sampling mechanism 2 connected to the connector 1, and a soil-breaking mechanism 3 connected to the sampling mechanism 2. The sampling mechanism 2 includes a hollow sampling tube 21. A hinged column 22 is installed inside the sampling tube 21. Baffles 23 are symmetrically hinged at both ends of the hinged column 22. The specifications and dimensions of the two baffles 23 are adapted to the sampling tube 21. A retaining ring 24 is installed inside the sampling tube 21 at the lower side of the hinged column 22. When the baffles 23 contact the retaining ring 24, the baffles 23 are in a horizontal state. The soil breaking mechanism 3 includes a hollow soil breaking pipe 31, which is connected to the sampling pipe 21. A drill bit 32 is installed at the soil entry end of the soil breaking pipe 31, and the drill bit 32 is hollow inside. The drill bit 32, the soil breaking tube 31, and the sampling tube 21 have the same inner diameter, and they rotate synchronously.

[0021] In this implementation case, when using a low-disturbance combined soil breaking drill for engineering quality testing, the drill adopts a modular assembly structure. The core is composed of a connector 1 that connects to the power end, a sampling mechanism 2 for retaining soil samples, and a soil breaking mechanism 3 responsible for breaking the strata. The modules work together to achieve the entire low-disturbance sampling process. First, connector 1 is precisely connected to the external power end. Power is transmitted through connector 1 to the internal hollow sampling tube 21 in sampling mechanism 2, and then from sampling tube 21 to the hollow soil breaking tube 31 of soil breaking mechanism 3, which finally drives the hollow drill bit 32 installed at the soil entry end of soil breaking tube 31 to rotate synchronously. During the soil breaking stage, the rotating drill bit 32 first contacts the target stratum, breaking the soil using its own structural characteristics. At the same time, the design guides the excess soil after breaking to diffuse outwards, preventing it from accumulating towards the center. The original soil sample that meets the testing requirements enters the soil breaking tube 31 through the hollow channel of the drill bit 32, and then flows smoothly into the sampling tube 21 through the docking channel between the soil breaking tube 31 and the sampling tube 21. During the process of the soil sample entering the sampling tube 21, it will come into contact with two baffles 23 that are symmetrically hinged at both ends of the hinged column 22 installed inside the sampling tube 21. The thrust generated by the continuously flowing soil sample will force the two baffles 23 to rotate upwards around the hinged column 22, leaving a channel for the soil sample to enter. At this time, the limiter set on the hinged column 22 will limit the maximum rotation angle of the baffles 23 to prevent the baffles 23 from rotating excessively and leaving the working position. After sampling is completed, the drill bit is pulled upwards. The soil sample in the sampling tube 21 is pressed downwards by its own weight. With the reset guidance of the limiter, the two baffles 23 are pushed downwards synchronously until the baffles 23 are in complete contact with the retaining ring 24 located on the lower side of the hinge column 22 inside the sampling tube 21. At this time, the baffles 23 remain horizontal, accurately sealing the channel of the sampling tube 21, so as to achieve reliable retention of the soil sample. When the drill bit is completely pulled out later, the soil sample can be obtained from the sampling tube 21. The sampling tube 21 can also be disassembled separately and used as a storage object for soil samples. By preparing multiple sampling tubes 21 for backup, multiple samples can be stored.

[0022] In summary, the overall design adopts a modular, purely mechanical approach consisting of connector 1, sampling mechanism 2, and soil breaking mechanism 3, without any redundant electronic or hydraulic components. The structure is simple and compact, which not only reduces the processing and assembly difficulty of each module but also reduces potential failure points. Furthermore, each module is easy to disassemble and assemble, facilitating later maintenance and component replacement. At the same time, the inner diameters of sampling tube 21, soil breaking tube 31, and drill bit 32 are kept consistent and rotate synchronously, ensuring uniform power transmission and avoiding stress concentration caused by structural misalignment or uneven stiffness. This significantly reduces radial oscillation of the drill bit and reduces friction and extrusion disturbance to the borehole wall soil from the structural design perspective, achieving low-disturbance drilling.

[0023] The preferred sampling tube 21 is provided with a degassing hole 25.

[0024] In this implementation case, an air degassing hole 25 is opened on the wall of the sampling tube 21. The air degassing hole 25 penetrates the inner and outer walls of the sampling tube 21, so that the internal cavity of the sampling tube 21 is directly connected with the external environment, ensuring that the air in the tube can be smoothly discharged when the soil sample enters. Furthermore, the degassing hole 25 can be designed as an inclined structure with the orifice facing away from the sampling end. At the same time, a micro dust filter screen can be added to the orifice to prevent external soil debris or impurities from entering the sampling tube 21 through the degassing hole 25. This will not affect the degassing effect and will also prevent the channel from being blocked. The degassing hole 25 can balance the pressure inside and outside the sampling tube 21 in real time, avoiding high pressure caused by air retention when the soil sample enters, which would lead to excessive compression or deformation of the soil sample and achieve low-disturbance sampling. At the same time, smooth venting allows the soil sample to enter the tube smoothly, reducing the damage to the original structure of the soil sample caused by airflow impact, further ensuring the integrity of the soil sample and providing support for the accuracy of the test data.

[0025] A plug 26 is internally threaded at the end of the preferred sampling tube 21 away from the drill bit 32. The plug 26 seals one end of the sampling tube 21 and is fixedly connected to a screw plate 27.

[0026] In this embodiment, the inner wall of the sampling tube 21 away from the drill bit 32 is machined with internal threads, and the outer wall of the plug 26 is machined with corresponding external threads. The plug 26 and the sampling tube 21 are detachably connected through the threaded engagement. After the plug 26 is fully screwed in, the port of the sampling tube 21 is sealed. The screw plate 27 adopts a flat plate structure and is vertically fixed to the end of the plug 26 away from the sampling tube 21, forming an operating part that is easy to hold and rotate. Furthermore, an annular elastic sealing gasket is added to the contact surface between the plug 26 and the sampling tube 21 to enhance the sealing performance; at the same time, anti-slip texture is processed on the surface of the screw plate 27, or it is designed into a cross-shaped or hexagonal structure to improve grip comfort and prevent slippage during operation. The threaded plug 26 provides a reliable seal, effectively preventing soil samples from leaking from the port or being disturbed by the external environment during sampling and transportation, thus reducing secondary disturbances. The screw plate 27 simplifies the disassembly and assembly of the plug 26, allowing the sampling tube 21 to be opened quickly without additional tools, shortening the soil sample extraction time, and avoiding repeated touching and disturbance of the soil sample due to cumbersome operations, thus balancing convenience and low disturbance requirements.

[0027] A slanted guide plate 28 is integrally connected to the lower side of the retaining ring 24 inside the preferred sampling tube 21.

[0028] In this embodiment, the inclined guide plate 28 and the sampling tube 21 are manufactured using an integral molding process; the retaining ring 24 is set on the lower side inside the sampling tube 21; its guiding surface faces the drill bit 32; forming a guide structure inclined towards the central cavity of the sampling tube 21; after the soil sample enters from the soil breaking tube 31, it can slide into the sampling tube 21 along the guiding surface. Furthermore, the tilt angle of the inclined guide plate 28 can be adjusted according to the inner diameter of the sampling tube 21 and the type of soil sample to make the guide more closely match the flow trajectory of the soil sample. At the same time, the surface of the inclined guide plate 28 can be mirror polished to reduce the frictional resistance between the soil sample and the plate surface. The inclined guide plate 28 can accurately guide the incoming soil sample; prevent the soil sample from accumulating below the retaining ring 24 or deviating from the central channel; ensure that the soil sample fills the sampling tube 21 smoothly and evenly; reduce structural damage caused by local compression or collision of the soil sample; the one-piece molding design ensures structural rigidity; avoid vibration caused by loose parts during the guidance process; and further reduce disturbance.

[0029] The preferred hinge column 22 is equipped with a limiter, which prevents the two baffles 23 from being completely fitted together.

[0030] In this implementation, the limiter adopts a protruding structure; it is directly machined or fixed on the outer wall of the hinge post 22; it is located between the two baffles 23; when the baffles 23 rotate upward around the hinge post 22, the limiter will contact the inner side of the baffles 23; limiting the maximum rotation angle of the baffles 23; so that the two baffles 23 always maintain a certain distance; and cannot be completely fitted. Furthermore, the limiter can be designed as an adjustable structure; by replacing the limit blocks of different heights or rotating the adjusting bolts, it can adapt to the sampling needs of soil samples with different particle sizes; at the same time, the limiter can be made of wear-resistant alloy steel to extend its service life and avoid limit failure due to wear after long-term use. The limiter effectively prevents the baffle 23 from falling out of its working position due to excessive rotation; ensures that when the drill bit is extracted, the soil sample's own weight can smoothly push the baffle 23 back to its original position and precisely fit with the retaining ring 24; achieves reliable closure of the sampling tube 21 channel; the closure process is smooth and without impact; avoids shaking or squeezing of the soil sample due to improper return of the baffle 23; ensures that the soil sample is not disturbed during the lifting process; and improves sampling reliability. It should be noted that during extraction, even if there is soil sample jamming on the underside of the returned baffle 23, it will not affect the obstruction and retrieval of most of the soil sample in the sampling tube 21.

[0031] The outer side of the preferred soil-breaking pipe 31 is integrally connected with a spiral rib 33.

[0032] In this implementation case, the spiral rib 33 and the soil breaking pipe 31 are manufactured using an integral molding process; the spiral extends and is distributed along the outer side wall of the soil breaking pipe 31; the spiral direction is consistent with the rotation direction of the drilling tool during operation; and it rotates synchronously with the soil breaking pipe 31 to achieve auxiliary soil breaking and cuttings removal functions. Furthermore, a variable pitch design can be adopted; the pitch is smaller at the end closer to the drill bit 32 and larger at the end farther from the drill bit 32; this enhances chip removal efficiency; at the same time, the outer edge of the spiral rib 33 is rounded to prevent scraping of the hole wall soil during rotation. When the spiral rib 33 rotates, it can assist in breaking the strata; reduce the resistance of the drill bit into the soil; reduce the vibration and disturbance generated during the soil breaking process; at the same time, it can diffuse the soil debris generated during soil breaking to both sides of the borehole wall; prevent the debris from accumulating in the hollow channel of the soil breaking pipe 31; prevent the original soil sample from being squeezed into the pipe; achieve low-disturbance soil breaking; and ensure the original state of the soil in the sampling area.

[0033] Preferably, the drill bit 32, the soil breaking pipe 31, and the sampling pipe 21 are connected to each other by threads, and the helical direction of the thread locking is the same as the rotation direction during operation.

[0034] In this implementation case, the mating ends of the drill bit 32 and the soil breaking pipe 31, and the mating ends of the soil breaking pipe 31 and the sampling pipe 21 are respectively machined with matching male and female threads; the three are fixedly connected by thread engagement; the locking helix direction of the thread is the same as the rotation direction of the drill bit during operation; ensuring that the connection becomes tighter and tighter as it is screwed during drilling. Furthermore, an annular sealing groove is machined on the threaded connection surface; an elastic sealing ring is embedded inside; the sealing performance of the connection is enhanced; soil debris or water from the hole is prevented from entering the connection; and an anti-loosening step is set at the end of the thread; further improving the stability of the connection; and avoiding thread loosening caused by long-term vibration. The threaded connection has high strength; it can stably transmit the torque and axial force required for drilling; it ensures the synchronous rotation of the drill bit 32, the soil breaking tube 31, and the sampling tube 21; it avoids vibration disturbance caused by relative motion; it is easy to disassemble and assemble; it is convenient for later maintenance or replacement of parts of different specifications; it is adaptable to different working conditions; the connection becomes tighter as it is screwed during operation; it effectively prevents the risk of disengagement caused by vibration; it ensures the overall stability of the drilling tool; and it indirectly reduces disturbance caused by structural shaking.

[0035] The preferred drill bit 32 is evenly provided with soil entry claws 321, and a soil unloading groove 322 is provided between two adjacent soil entry claws 321.

[0036] In this embodiment, the soil entry claws 321 are evenly distributed on the edge of the soil entry end of the drill bit 32; they have a raised tooth-like structure; they are integrally formed with the drill bit 32; a through unloading groove 322 is reserved between two adjacent soil entry claws 321; the unloading groove 322 extends from the soil entry end of the drill bit 32 to the outer wall; forming a soil guiding channel. Furthermore, the tips of the teeth of the soil-penetrating claw 321 are designed with an arc shape to reduce piercing damage to the soil during penetration; at the same time, the width and inclination angle of the soil-discharging trough 322 are adjusted to better conform to the soil flow trajectory and improve soil discharge efficiency. The soil-penetrating claw 321 enhances the soil-breaking ability of the drill bit 32, ensures the drill bit smoothly enters the strata, and reduces impact vibration during soil breaking. The soil-unloading groove 322 can accurately guide the broken soil to move to the outside of the drill bit 32, prevent the soil from accumulating in the hollow channel in the center of the drill bit 32, prevent the original soil sample from being squeezed into the soil-breaking tube 31, achieve low-disturbance soil breaking, and ensure the smoothness of soil sample entry into the channel and the authenticity of the soil sample.

[0037] The preferred drill bit 32 is composed of multiple parts, starting from the entry end, consisting of a pilot helical cutting edge 3201, a main helical cutting tooth 3202, and a helical centering wing 3203.

[0038] In this implementation case, the drill bit 32 adopts a multi-component splicing assembly structure; starting from the soil entry end, the pilot spiral cutting edge 3201, the main spiral cutting tooth 3202, and the spiral centering wing 3203 are installed in sequence; the three are arranged coaxially and have the same spiral direction; together they form a complete "cutting-conveying-connection" system; and are fixedly connected to the soil breaking pipe 31 by threads; Furthermore, depending on the characteristics of different formations, the pilot helical cutting edge 3201 and the main helical cutting tooth 3202 can be replaced with different materials; for example, hard formations can be made of cemented carbide, while soft formations can be made of elastic wear-resistant material; at the same time, an elastic buffer layer is added to the outside of the helical centering wing 3203 to reduce hard contact with the borehole wall. The pilot spiral cutting edge 3201 penetrates the formation first, achieving precise guidance and reducing borehole wall disturbance caused by borehole deviation. The main spiral cutting teeth 3202 efficiently break up the formation and, in conjunction with the spiral structure, enable rapid transport of debris. The spiral centering wing 3203 provides radial support, ensuring borehole verticality and reducing drill bit oscillation. The three work together to improve soil breaking efficiency while minimizing friction and compression disturbance to the borehole wall soil, extending the service life of the drill bit 32, and preserving the original state of the soil in the sampling area.

[0039] Preferably, connector 1 is a hexahedral connector and is magnetic.

[0040] In this implementation case, the connector 1 is designed as a hexahedral structure; its end face that mates with the power end has embedded magnetic components; during mating, it is initially fixed by magnetic attraction; and then the positioning characteristics of the hexahedral structure are utilized to ensure that the connector 1 and the power end fit precisely, thus achieving stable power transmission. Furthermore, a permanent magnet material with strong magnetic force and anti-magnetic decay is selected to improve the adsorption firmness and service life; at the same time, an anti-slip texture is processed on the hexagonal surface of connector 1 to further enhance the stability of the connection and avoid relative slippage during power transmission. The hexahedral structure can accurately transmit rotational force, avoid slippage or deviation during power transmission, ensure smooth rotation of the drill bit, and reduce drill bit swaying disturbance caused by uneven power transmission. The magnetic adsorption design enables quick insertion and connection between connector 1 and the power end, eliminating the need for complex alignment operations, significantly shortening assembly time, and improving work efficiency. At the same time, rapid assembly reduces additional operations during drill bit debugging and lowers the risk of disturbance caused by improper operation.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A low-disturbance combined soil-breaking drill for engineering quality inspection, comprising a connector (1) connected to a power end, characterized in that: The connector (1) is connected to a sampling mechanism (2), and the sampling mechanism (2) is connected to a soil breaking mechanism (3). The sampling mechanism (2) includes a hollow sampling tube (21), a hinge column (22) is installed inside the sampling tube (21), and baffles (23) are symmetrically hinged at both ends of the hinge column (22). The specifications and dimensions of the two baffles (23) are adapted to the sampling tube (21). A retaining ring (24) is installed inside the sampling tube (21) at the lower side of the hinge column (22). When the baffle (23) contacts the retaining ring (24), the baffle (23) is in a horizontal state. The soil breaking mechanism (3) includes a hollow soil breaking tube (31), which is connected to the sampling tube (21). A drill bit (32) is installed at the soil entry end of the soil breaking tube (31), and the drill bit (32) is hollow inside. The drill bit (32), the soil breaking tube (31), and the sampling tube (21) have the same inner diameter, and the drill bit (32), the soil breaking tube (31), and the sampling tube (21) rotate synchronously.

2. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: The sampling tube (21) is provided with a degassing hole (25).

3. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: The sampling tube (21) has a plug (26) internally threaded at the end away from the drill bit (32). The plug (26) seals one end of the sampling tube (21), and the plug (26) is fixedly connected to a screw plate (27).

4. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: An inclined guide plate (28) is integrally connected to the lower side of the retaining ring (24) inside the sampling tube (21).

5. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: The hinge column (22) is equipped with a limiter, which prevents the two baffles (23) from fitting together completely.

6. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: The outer side of the soil-breaking pipe (31) is integrally connected with a spiral rib (33).

7. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: The drill bit (32), the soil breaking pipe (31) and the sampling pipe (21) are connected to each other by threads, and the spiral direction of the thread locking is the same as the rotation direction during operation.

8. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: The drill bit (32) is evenly provided with soil entry claws (321), and a soil unloading groove (322) is provided between two adjacent soil entry claws (321).

9. The low-disturbance combined soil-breaking drill bit for engineering quality inspection according to claim 1, characterized in that: The drill bit (32) is composed of multiple parts spliced ​​together, starting from the soil entry end, consisting of a pilot helical cutting edge (3201), a main helical cutting tooth (3202), and a helical centering wing (3203).

10. A low-disturbance combined soil-breaking drill for engineering quality inspection according to claim 1, characterized in that: The connector (1) is a hexahedral connector and is magnetic.

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