A geotechnical engineering investigation drilling device

Abstract

The present invention provides a geotechnical engineering exploration drilling device, comprising: an inner cylinder and an outer cylinder. The inner cylinder and the outer cylinder are arranged along a first axis. The outer peripheral wall surface of the inner cylinder is in close contact with the inner peripheral wall surface of the outer cylinder. The inner cylinder includes a plurality of sub-cylinders, and the plurality of sub-cylinders are connected end to end in pairs along the first axis. The adjacent sub-cylinders are detachably connected. The plurality of sub-cylinders are used to take out samples in segments, and the first axis is the central axis of the outer cylinder. Thus, by segmenting the inner cylinder into a plurality of sub-cylinders, it is possible to take out samples in segments during the sample taking stage, which can avoid the problem that the core samples fall off quickly and cannot be correctly sorted when taking out the core samples with traditional geotechnical engineering exploration drilling devices. Segment sampling also makes it more convenient to segment and load the soft cores and complete hard cores into the sample box.

Description

Technical Field

[0001] The present invention relates to the field of geological exploration, and particularly to a drilling device for geotechnical engineering investigation. Background Art

[0002] In geological exploration work, obtaining underground core samples through drilling is an important means to understand formation structures, rock properties, and the distribution of mineral resources, etc. During the drilling process, the core is preserved in the inner tube, and subsequently, it needs to be taken out of the inner tube for detailed analysis and research.

[0003] When the existing drilling devices for geotechnical engineering investigation encounter fragmented hard cores, they are taken out by hammering the outer wall of the inner tube. However, hammering the outer wall of the inner tube may cause the core to fall off quickly. Due to the fragmentation and fast falling-off speed of the core, it is very difficult to sort it effectively, which affects the judgment of geological structures and sedimentary environments. For soft cores, their own structures are relatively loose, and hammering the outer wall of the inner tube is difficult to provide sufficient force to make them fall off smoothly. The friction between the complete hard core and the inner tube is relatively large, and it is also not easy to fall off. The existing core extraction methods cannot meet the requirements of efficient extraction, orderly arrangement, and convenient segmentation when facing cores of different textures. Summary of the Invention

[0004] Based on this, it is necessary to provide a drilling device for geotechnical engineering investigation to address the problem that the core samples of the current drilling devices for geotechnical engineering investigation fall off quickly, resulting in difficulty in effectively sorting the core samples.

[0005] The above object is achieved through the following technical solutions:

[0006] A drilling device for geotechnical engineering investigation includes an inner cylinder and an outer cylinder. The inner cylinder and the outer cylinder are arranged along a first axis. The outer peripheral wall surface of the inner cylinder is closely attached to the inner peripheral wall surface of the outer cylinder. The inner cylinder includes a plurality of sub-cylinders. The plurality of sub-cylinders are connected end to end in pairs along the first axis. The adjacent sub-cylinders are detachably connected. The plurality of sub-cylinders are used to take out samples in segments. The first axis is the central axis of the outer cylinder.

[0007] During the use of the drilling device for geotechnical engineering investigation, a sampling stage, an inner cylinder removal stage, and a sample removal stage are formed. When in the sampling stage, the drilling device for geotechnical engineering investigation enters the geotechnical sampling; when in the inner cylinder removal stage, the inner cylinder is taken out of the outer cylinder; when in the sample removal stage, the core sample is taken out of the inner cylinder.

[0008] In one embodiment, a sleeve is disposed inside any one of the sub-cylinders. The outer peripheral wall surface of the sleeve is closely attached to the inner peripheral wall surface of the sub-cylinder. During the sampling stage and the stage of taking out the inner cylinder, the sleeve and the sub-cylinder are relatively stationary; during the stage of taking out the sample, the sleeve and the sub-cylinder can rotate relative to each other, and the sleeve is used to accommodate the sample.

[0009] In one embodiment, the inner cylinder at least includes adjacent first and second sub-cylinders. A shrapnel ring is disposed between the first sub-cylinder and the second sub-cylinder. One end of the shrapnel ring is detachably connected to one end of the first sub-cylinder, and the other end of the shrapnel ring is rotatably connected to one end of the second sub-cylinder.

[0010] In one embodiment, at least two articulated balls are provided at one end of the shrapnel ring close to the first sub-cylinder, and at least two articulated sliders are provided on the inner peripheral wall surface of the first sub-cylinder close to the second sub-cylinder. The articulated balls and the articulated sliders are detachably connected.

[0011] In one embodiment, at least two pressing members are provided at one end of the shrapnel ring close to the second sub-cylinder. During the stage of taking out the sample, the shrapnel ring drives the pressing members to press the sample so that the sample breaks.

[0012] In one embodiment, a top block is disposed between the pressing member and the outer cylinder. During the sampling stage, the pressing member pushes the top block so that the outer cylinder and the plurality of sub-cylinders do not rotate relative to each other. During the stage of taking out the inner cylinder and the stage of taking out the sample, the shrapnel ring drives the pressing member to move so that the pressing member no longer pushes the top block, so that the outer cylinder and the plurality of sub-cylinders rotate relative to each other.

[0013] In one embodiment, the sub-cylinder includes a first cylinder and a second cylinder. The second cylinder is rotatably sleeved on the first cylinder. When the first cylinder and the second cylinder rotate relative to each other, the pressing member is driven to rotate relative to the sample.

[0014] In one embodiment, at least two second sliding bolts and at least two second rotating blocks are disposed between the first cylinder and the second cylinder. The second sliding bolts are used to limit the relative movement of the first cylinder and the second cylinder along the first axis, and the second rotating blocks are used to limit the relative rotation of the first cylinder and the second cylinder during the sampling stage.

[0015] In one embodiment, at least two of the articulated sliders are provided with sliding bumps, and at least two of the second rotating blocks are provided with sliding grooves. The sliding grooves and the sliding bumps are used to drive the second rotating block to move along the first axis when the articulated slider moves perpendicular to the first axis.

[0016] In one embodiment, the articulated slider is provided with a scribing structure for scribing on the surface of the sample.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a geotechnical engineering investigation and drilling device, including: an inner cylinder and an outer cylinder. The inner cylinder and the outer cylinder are arranged along a first axis. The outer peripheral wall surface of the inner cylinder is in close contact with the inner peripheral wall surface of the outer cylinder. The inner cylinder includes a plurality of sub-cylinders. The plurality of sub-cylinders are connected end to end in pairs along the first axis. The adjacent sub-cylinders are detachably connected. The plurality of sub-cylinders are used to take out samples in sections. The first axis is the central axis of the outer cylinder. Thus, by segmenting the inner cylinder into a plurality of sub-cylinders, it is possible to take out samples in sections during the sample taking stage, which can avoid the problem that the core sample quickly falls off and cannot be correctly sorted when taking out the core sample in the traditional geotechnical engineering investigation and drilling device. Sectional sampling also makes it more convenient to segment and load the soft core and the complete hard core into the sample box. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the geotechnical engineering investigation and drilling device provided by an embodiment of the present invention;

[0020] Figure 2 It is an exploded view of the geotechnical engineering investigation and drilling device provided by an embodiment of the present invention;

[0021] Figure 3 It is an exploded view of the inner cylinder of the geotechnical engineering investigation and drilling device provided by an embodiment of the present invention;

[0022] Figure 4 It is a schematic structural diagram of the shrapnel ring of the geotechnical engineering investigation and drilling device provided by an embodiment of the present invention;

[0023] Figure 5 It is a schematic structural diagram of the second cylinder of the geotechnical engineering investigation and drilling device provided by an embodiment of the present invention;

[0024] Figure 6 It is an exploded structural view of the second sliding bolt, the first rotating block and the second rotating block of the geotechnical engineering investigation and drilling device provided by an embodiment of the present invention;

[0025] Figure 7 It is a side view of the geotechnical engineering investigation and drilling device provided by an embodiment of the present invention;

[0026] Figure 8 For Figure 7 The A-A cross-sectional view of the shrapnel ring in the initial state of the geotechnical engineering exploration drilling device;

[0027] Figure 9 For Figure 8 The structural schematic diagram of the B part of the geotechnical engineering exploration drilling device;

[0028] Figure 10 For Figure 7 The A-A cross-sectional view of the shrapnel ring in the first state of the geotechnical engineering exploration drilling device;

[0029] Figure 11 For Figure 10 The structural schematic diagram of the C part of the geotechnical engineering exploration drilling device.

[0030] Wherein:

[0031] 100, outer cylinder;

[0032] 200, inner cylinder; 210, first sub-cylinder; 220, second sub-cylinder; 230, first cylinder; 231, shrapnel ring; 232, fixing bolt; 233, first sliding bolt; 234, first bolt hole; 235, articulated ball; 236, first rotating block; 237, first sliding groove; 238, protrusion; 240, second cylinder; 241, top block; 242, top block groove; 243, articulated slider; 244, sliding convex block; 245, articulated sliding groove; 246, second sliding bolt; 247, second bolt hole; 248, bolt groove; 249, second rotating block; 251, sliding groove; 252, second sliding groove.

[0033] 300, sleeve; 310, groove; 320, first sleeve; 330, second sleeve; 340, articulated rotating shaft. Specific embodiments

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further details the present invention through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The serial numbers assigned to the components in this text, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" as used in this invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this invention.

[0036] In this invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] The following refers to Figures 1 - 11 Describe the geotechnical engineering exploration drilling device provided by the embodiments of this invention.

[0038] The geotechnical engineering exploration drilling device provided by the embodiments of this invention is particularly suitable for the drilling operation during the geotechnical engineering exploration process. Of course, it can also be applicable to the drilling work for sampling and analyzing the formation in other geological exploration fields.

[0039] Specifically, as Figures 1 - 2 shown, the geotechnical engineering exploration drilling device includes an outer cylinder 100, an inner cylinder 200, and a fishing tool (not shown in the figure). The outer cylinder 100 is used to perform operations such as crushing and cutting on the rock and soil. The inner cylinder 200 is used to accommodate the core sample. The fishing tool is used to take out the inner cylinder 200. The inner cylinder 200 is disposed inside the outer cylinder 100, and the outer peripheral wall surface of the inner cylinder 200 is closely attached to the inner peripheral wall surface of the outer cylinder 100.

[0040] The geotechnical engineering exploration drilling device has a sampling stage, a stage of taking out the inner cylinder, and a stage of taking out the sample during the use process. During the sampling stage, the geotechnical engineering exploration drilling device descends into the rock and soil for sampling. During the stage of taking out the inner cylinder, the fishing tool takes out the inner cylinder 200 from the outer cylinder 100. During the stage of taking out the sample, the core sample is taken out from the inner cylinder 200.

[0041] When using a traditional geotechnical engineering exploration drilling device, hammering the outer wall of the outer cylinder 100 will cause the core samples to fall off quickly, resulting in the mixing of core samples or the confusion of the core sample order due to unclear marking. As Figure 2 shown, for the geotechnical engineering exploration drilling device provided in the embodiment of the present invention, in order to clarify the order of core samples during sampling, the inner cylinder 200 includes a plurality of sub-cylinders. The plurality of sub-cylinders are connected end to end in pairs along the first axis, and the adjacent sub-cylinders are detachably connected. The plurality of sub-cylinders are used to take out samples in segments, and the first axis is the central axis of the outer cylinder 100. Specifically, a plurality of sub-cylinders are arranged in the outer cylinder 100 for sampling, and the adjacent sub-cylinders are rotationally connected by threads. During the sampling stage and the stage of taking out the inner cylinder, the plurality of sub-cylinders are connected to form a complete inner cylinder 200, and the inner cylinder 200 and the outer cylinder 100 move synchronously; during the stage of taking out the samples, the inner cylinder 200 is separated into a plurality of sub-cylinders one by one by rotation, and then a cutting tool is used to split the core samples, so that a section of core sample is taken out along with the sub-cylinder. Thus, by setting the inner cylinder 200 into a plurality of sub-cylinders and taking out the core samples in sequence, the order of the core samples is ensured, and the problem of the confusion of the core sample order caused by the mixing or unclear marking of the core samples is avoided, and the working efficiency of the geotechnical engineering exploration drilling device is improved.

[0042] In one of the embodiments, as Figures 2 - 6 shown, since when rotating the sub-cylinder to segment the core samples, the core samples between two adjacent sub-cylinders will be scattered and fall off due to excessive damage during rotation. In order to prevent the core samples from being excessively damaged during the separation of the sub-cylinders, a sleeve 300 is arranged inside any one of the sub-cylinders. The outer peripheral wall surface of the sleeve 300 is closely attached to the inner peripheral wall surface of the sub-cylinder. During the sampling stage and the stage of taking out the inner cylinder, the sleeve 300 and the sub-cylinder are relatively stationary; during the stage of taking out the samples, the sleeve 300 and the sub-cylinder can rotate relative to each other, and the sleeve 300 is used to accommodate the samples. Specifically, a sleeve 300 is arranged inside any one of the sub-cylinders, and the core samples are stored in the sleeve 300, and finally the core samples are taken out from the sleeve 300. During the sampling stage, the core samples enter the sleeve 300, and as the core samples continuously enter the sleeve 300; during the stage of taking out the inner cylinder, the sleeve 300 is taken out of the outer cylinder 100 along with the sub-cylinder; during the stage of taking out the samples, when the adjacent sub-cylinders are rotationally separated by threads, the inner and outer peripheral walls of the sleeve 300 are affected by the frictional force of the core samples, and the sleeve 300 does not rotate synchronously with the sub-cylinder. After separating the sub-cylinders, the sleeve 300 in the sub-cylinder is taken out, and finally the core samples in the sleeve 300 are taken out.

[0043] Due to the rough surface and high material hardness of the core sample, the frictional force between the core sample and the sleeve 300 is relatively large. The contact surface between the sleeve 300 and the inner cylinder 200 is smooth, and the frictional force is relatively small. When the sub-cylinder is rotated, the sleeve 300 and the sub-cylinder will rotate relative to each other, thereby reducing the damage to the core sample caused by the rotation of the sub-cylinder. By setting the sleeve 300, it is possible to avoid excessive damage to the core sample due to the rotation between the sub-cylinders when separating the sub-cylinders, and prevent the core sample from being scattered and falling off.

[0044] Furthermore, as Figures 2 - 3 shown, a ring of protrusions 238 is provided on the inner wall of the sub-cylinder, and a ring of grooves 310 is provided on the sleeve 300. When installing the sleeve 300, the protrusions 238 are inside the grooves 310, so that the sleeve 300 and the sub-cylinder do not slide relative to each other along the first axis; when disassembling the sleeve 300, push the end of the sleeve 300 close to the groove 310, so that the protrusions 238 are separated from the grooves 310, and then the sleeve 300 can be taken out from the sub-cylinder. Thus, the sleeve 300 is fixed by a simple structure, improving the working efficiency of assembling and disassembling the sleeve 300.

[0045] Specifically, in order to better take out the core sample in the sleeve 300, the sleeve 300 is divided into a first sleeve 320 and a second sleeve 330. The first sleeve 320 and the second sleeve 330 are rotatably connected by a hinge shaft 340, so that after the sleeve 300 is taken out, the first sleeve 320 and the second sleeve 330 can be rotatably separated, thereby completely taking out the core sample.

[0046] In one of the embodiments, as Figures 2 - 11 shown, in this embodiment, the inner cylinder 200 at least includes adjacent first sub-cylinder 210 and second sub-cylinder 220. In order to better obtain a complete core sample, taking the first sub-cylinder 210 and the second sub-cylinder 220 as an example, a spring plate ring 231 is provided between the first sub-cylinder 210 and the second sub-cylinder 220. One end of the spring plate ring 231 is detachably connected to one end of the first sub-cylinder 210, and the other end of the spring plate ring 231 is rotatably connected to one end of the second sub-cylinder 220. Specifically, a self-locking buckle is provided at one end of the inner peripheral wall surface of the first sub-cylinder 210 close to the second sub-cylinder 220. One end of the spring plate ring 231 is detachably connected to the self-locking buckle, and the other end of the spring plate ring 231 is rotatably connected to the second sub-cylinder 220 by a fixing bolt 232, so that the spring plate ring 231 only twists along the first axis when the first sub-cylinder 210 and the second sub-cylinder 220 rotate.

[0047] During the use of the geotechnical engineering exploration drilling device, the shrapnel ring 231 has a first state and a second state. When in the first state, the first sub-cylinder 210 and the second sub-cylinder 220 rotate relative to each other, and the two ends of the shrapnel ring 231 gradually move away from each other. The detachable end of the shrapnel ring 231 always contacts the first sub-cylinder 210. When in the second state, the first sub-cylinder 210 and the second sub-cylinder 220 are separated. At this time, the detachable end of the shrapnel ring 231 is separated from the first sub-cylinder 210, and the shrapnel ring 231 no longer contacts the first sub-cylinder 210. Thus, by setting the shrapnel ring 231, when separating the first sub-cylinder 210 and the second sub-cylinder 220, the core sample does not directly contact the separation point of the first sub-cylinder 210 and the second sub-cylinder 220, but contacts the shrapnel ring 231. Thus, the integrity of the core sample is better guaranteed.

[0048] Furthermore, setting the shrapnel ring 231 between adjacent sub-cylinders can enable the shrapnel ring 231 to play a certain buffering role when any sub-cylinder is impacted or vibrated during movement. The elastic deformation of the shrapnel ring 231 can absorb part of the impact energy and reduce the collision between sub-cylinders. At the same time, by setting the shrapnel ring 231, it can prevent the sub-cylinders from loosening or disconnecting due to external forces such as vibration and torsion during the drilling process, resulting in the dispersion of the core sample, and ensuring the stability of the overall structure of the core sample.

[0049] In one embodiment, as Figures 2 - 9 shown, in order to better separate the first sub-cylinder 210 and the second sub-cylinder 220, at least two hinge balls 235 are provided at the end of the shrapnel ring 231 close to the first sub-cylinder 210, and at least two hinge sliders 243 are provided at the end of the inner peripheral wall surface of the first sub-cylinder 210 close to the second sub-cylinder 220. The hinge balls 235 and the hinge sliders 243 are detachably connected. Specifically, the first sub-cylinder 210 and the second sub-cylinder 220 are further connected through the hinge balls 235 on the shrapnel ring 231 and the hinge sliders 243 of the first sub-cylinder 210. When the first sub-cylinder 210 and the second sub-cylinder 220 do not rotate relative to each other, the shrapnel ring 231 is always in the initial state; when the first sub-cylinder 210 and the second sub-cylinder 220 rotate relative to each other, when the second sub-cylinder 220 moves away from the first sub-cylinder 210, the two ends of the shrapnel ring 231 gradually move away from each other. At this time, the shrapnel ring 231 is in the first state; when the first sub-cylinder 210 and the second sub-cylinder 220 are completely separated, the shrapnel ring 231 is in the second state, and at this time the hinge balls 235 and the hinge sliders 243 are separated. By setting the hinge balls 235 and the hinge sliders 243, it is more convenient and fast to completely separate the first sub-cylinder 210 and the second sub-cylinder 220, improving the working efficiency of the geotechnical engineering exploration drilling device.

[0050] In one embodiment, as Figures 2 - 9As shown, in order to break the core sample at the separation of the inner cylinder 200, at least two extrusion members are provided at one end of the spring ring 231 close to the second sub-cylinder 220. During the sample extraction stage, the spring ring 231 drives the extrusion members to extrude the sample so that the sample breaks. Specifically, taking the extrusion member as the first sliding bolt 233 as an example, at least two first bolt holes 234 are provided at one end of the spring ring 231 close to the second sub-cylinder 220. Any first sliding bolt 233 has a sufficient length to extrude the core sample. Any first sliding bolt 233 is inserted through some of the first bolt holes 234 so that the extrusion forces of at least two first sliding bolts 233 on the core sample are not in a balanced state in the direction perpendicular to the first axis. Since the core sample here only contacts the spring ring 231, when the extrusion forces on the core sample are unbalanced, stress concentration will occur in the extrusion area of the core sample. Stress concentration will reduce the strength of the core sample in these areas, thereby causing the core sample to break at the extrusion location. When the spring ring 231 is in the initial state, the first sliding bolt 233 extrudes the inner peripheral wall surface of the first sub-cylinder 210 outwardly; when the spring ring 231 is in the first state, the movement of the spring ring 231 drives the first sliding bolt 233 to move along the first axis, so that the first sliding bolt 233 no longer extrudes the inner peripheral wall surface of the first sub-cylinder 210, and the first sliding bolt 233 begins to extrude the core sample. When the spring ring 231 is in the second state, the first sub-cylinder 210 and the second sub-cylinder 220 are separated, and the first sliding bolt 233 is separated from the first sub-cylinder 210 along with the spring ring 231. At the same time, the release of the spring ring 231 causes the first sliding bolt 233 to no longer extrude the core sample. Thus, by providing at least two first sliding bolts 233, the core sample can be better segmented and broken, improving the utilization rate and working efficiency of the geotechnical tool exploration drilling device.

[0051] In one embodiment, as Figures 2 - 11As shown, since the sub-cylinder and the outer cylinder 100 rotate relative to each other, the rock and soil samples in the sub-cylinder will be disturbed, resulting in changes in the original structure and properties of the samples, thus affecting the sampling quality. To prevent the multiple sub-cylinders and the outer cylinder 100 from rotating, a top block 241 is provided between the first sliding bolt 233 and the outer cylinder 100. During the sampling stage, the first sliding bolt 233 pushes against the top block 241, so that the outer cylinder 100 and the multiple sub-cylinders do not rotate relative to each other. During the stage of removing the inner cylinder and the stage of removing the sample, the elastic ring 231 drives the first sliding bolt 233 to move, so that the first sliding bolt 233 no longer pushes against the top block 241, and the outer cylinder 100 and the multiple sub-cylinders rotate relative to each other. Specifically, a top block 241 is provided between any first sliding bolt 233 and the outer cylinder 100. At least two top block grooves 242 are provided on the sub-cylinder, and the top block 241 is arranged in the top block grooves 242. The top block grooves 242 enable the top block 241 to move only in the top block grooves 242. When in the sampling stage, the elastic ring 231 is in the initial state, and any first sliding bolt 233 pushes against any top block 241, so that at least two top blocks 241 press against the outer cylinder 100, increasing the friction between the top block 241 and the outer cylinder 100, thus preventing the outer cylinder 100 and the sub-cylinder from rotating relative to each other. When in the stage of removing the inner cylinder, the fishing tool first rotates the sub-cylinder farthest from the drill bit, so that the elastic ring 231 in the sub-cylinder enters the first state. The elastic ring 231 drives the first sliding bolt 233 to move, reducing the extrusion force of the first sliding bolt 233 on the top block 241, and reducing the friction between the top block 241 and the outer cylinder 100. The fishing tool continuously rotates the sub-cylinder, and the sub-cylinder rotates relative to the adjacent sub-cylinder, so that the elastic ring 231 drives the first sliding bolt 233 to move, thereby enabling all the sub-cylinders and the outer cylinder 100 to rotate relative to each other. The fishing tool hoists out all the sub-cylinders to complete the stage of removing the inner cylinder. When in the stage of removing the sample, the top block 241 and the first sliding bolt 233 no longer function. Thus, by providing the top block 241, the relative rotation between the outer cylinder 100 and the sub-cylinder is prevented during the sampling stage.

[0052] In one embodiment, as Figures 2 - 11As shown, in order to better break the core sample, the sub-cylinder includes a first cylinder 230 and a second cylinder 240. The second cylinder 240 is rotatably sleeved on the first cylinder 230. When the first cylinder 230 and the second cylinder 240 rotate relative to each other, the first sliding bolt 233 is driven to rotate relative to the sample. Specifically, the first cylinder 230 includes a shrapnel ring 231 and a first sliding bolt 233, and the second cylinder 240 includes a top block 241 and a hinged slider 243. During the sampling stage and the stage of removing the inner cylinder, the first cylinder 230 and the second cylinder 240 of the sub-cylinder do not rotate relative to each other; during the stage of removing the sample, the first cylinder 230 and the second cylinder 240 rotate relative to each other, thereby driving the first sliding bolt 233 to rotate obliquely around the core sample. At the same time, the first sliding bolt 233 continuously squeezes the core sample, so that there are weak areas such as stress concentration points, crystal defects or fine cracks at the microscopic level inside the core sample. When at least two first sliding bolts 233 rotate and squeeze the core sample, the weak areas will bear far more stress than other parts. As the first sliding bolt 233 continuously rotates and squeezes the core sample, the stress accumulates continuously. When the stress exceeds the bearing limit of the weak area, the cracks begin to expand and connect, so that the core sample breaks at this section or has a tendency to break. By setting the first cylinder 230 and the second cylinder 240 that can rotate relative to each other, the first sliding bolt 233 rotates and squeezes the core sample, effectively realizing the splitting of the core sample. At the same time, the first sliding bolt 233 can accurately rotate and squeeze the same section of the core sample, which can better protect the integrity of other parts of the core sample. Further, it reduces the labor intensity of the staff and improves the work efficiency.

[0053] In one embodiment, as Figures 2 - 11 shown, in order to prevent the first cylinder 230 and the second cylinder 240 from moving relative to each other during the sampling stage, at least two second sliding bolts 246 and at least two second rotating blocks 249 are provided between the first cylinder 230 and the second cylinder 240. The second sliding bolts 246 are used to limit the relative movement of the first cylinder 230 and the second cylinder 240 along the first axis, and the second rotating blocks 249 are used to limit the relative rotation of the first cylinder 230 and the second cylinder 240 during the sampling stage.

[0054] Specifically, a bolt groove 248 is provided at one end of the first cylinder body 230 close to the second cylinder body 240, and at least two second bolt holes 247 are provided at one end of the second cylinder body 240 close to the first cylinder body 230. Any second sliding bolt 246 passes through any second sliding bolt hole 247 and abuts against the bolt groove 248. The second sliding bolt 246 moves perpendicular to the first axis within the second bolt hole 247. A first sliding groove 237 is provided on the first cylinder body 230, and a second sliding groove 252 is provided on the second cylinder body 240. The second rotating block 249 is located within the first sliding groove 237 and the second sliding groove 252 and moves along the first axis. The second sliding bolt 246 always restricts the relative movement of the first cylinder body 230 and the second cylinder body 240 along the first axis within the bolt groove 248. During the sampling stage and the stage of taking out the inner cylinder, the second rotating block 249 restricts the relative rotation of the first cylinder body 230 and the second cylinder body 240; during the stage of taking out the sample, the second rotating block 249 no longer restricts the relative rotation of the first cylinder body 230 and the second cylinder body 240. An articulated sliding groove 245 is provided on the second cylinder body 240. The articulated slider 243 is located within the articulated sliding groove 245 and slides perpendicular to the first axis. One end of the second rotating block 249 abuts against the articulated slider 243, so that the movement of the articulated slider 243 drives the movement of the second rotating block 249.

[0055] When the shrapnel ring 231 is in the initial state, the articulated ball 235 drives the articulated slider 243 to be at the farthest distance from the first axis, so that the second rotating block 249 is located at the junction of the first cylinder body 230 and the second cylinder body 240. At this time, the second rotating block 249 restricts the relative rotation of the first cylinder body 230 and the second cylinder body 240; when the shrapnel ring 231 is in the early stage of the first state, the articulated ball 235 on the shrapnel ring 231 drives the articulated slider 243 to move towards the first axis, so that the second rotating block 249 moves along the first axis in a direction away from the second sliding bolt 246; when the shrapnel ring 231 is in the late stage of the first state, the distance between the articulated slider 243 and the first axis reaches the minimum value, so that at least one end of the two second rotating blocks 249 completely enters the second cylinder body 240. At this time, the first cylinder body 230 and the second cylinder body 240 can rotate relatively; when the shrapnel ring 231 is in the third state, the second cylinder body 240 drives the second rotating block 249 to move, and at the same time the second rotating block 249 restricts the articulated slider 243 from moving away from the first axis.

[0056] By providing at least two second sliding bolts 246 and at least two second rotating blocks 249, the relative rotation of the first cylinder body 230 and the second cylinder body 240 during the sampling stage is effectively restricted, thus ensuring the integrity of the core sample during the sampling stage and avoiding damage to the sample caused by the relative rotation of the first cylinder body 230 and the second cylinder body 240. At the same time, the first cylinder body 230 and the second cylinder body 240 can rotate relatively during the stage of taking out the sample, and thus the sampling can be successfully completed.

[0057] Further, in order to better prevent relative rotation between the first cylinder 230 and the second cylinder 240, a first rotating block 236 is arranged between adjacent second sliding bolts 246. The first rotating block 236 moves along the first axis in the first sliding groove 237. One end of any first rotating block 236 abuts against the first cylinder 230, and the other end of the first rotating block 236 abuts against the second rotating block 249. When the elastic ring 231 is in the initial state, the first rotating block 236 blocks between the second sliding bolts 246, and the second rotating block 249 is located at the junction of the first cylinder 230 and the second cylinder 240. At this time, both the first rotating block 236 and the second rotating block 249 limit the relative movement between the first cylinder 230 and the second cylinder 240; when the elastic ring 231 is in the early stage of the first state, the second rotating block 249 drives the first rotating block 236 to move along the first axis in a direction away from the second sliding bolt 246; when the elastic ring 231 is in the later stage of the first state, the first rotating block 236 and the second rotating block 249 no longer limit the second sliding bolt 246. At this time, the first cylinder 230 and the second cylinder 240 can rotate relative to each other, the first cylinder 230 drives the first rotating block 236 to move, and the second cylinder 240 drives the second rotating block 249 to move; when the elastic ring 231 is in the third state, the first cylinder 230 drives at least two first rotating blocks 236 to move, and the second cylinder 240 drives at least two second rotating blocks 249 to move. Thus, the relative movement between the first cylinder 230 and the second cylinder 240 perpendicular to the first axis can be better restricted.

[0058] In one embodiment, as Figures 2 - 11 shown, in order to better enable the articulated slider 243 to drive the second rotating block 249 to slide, sliding bumps 244 are arranged on at least two articulated sliders 243, and sliding grooves 251 are arranged on at least two second rotating blocks 249. The sliding grooves 251 and the sliding bumps 244 are used to enable the articulated slider 243 to drive the second rotating block 249 to move along the first axis when the articulated slider 243 moves perpendicular to the first axis. Specifically, when the articulated slider 243 moves under the action of the elastic ring 231, the sliding bump 244 on the articulated slider 243 drives the second rotating block 249 to move. Thus, at least two second rotating blocks 249 can make corresponding actions smoothly and quickly, improving the working efficiency of the geotechnical engineering investigation and drilling device.

[0059] In one of the embodiments, since the core sample is irregularly split by squeezing it with the first sliding bolt 233, the integrity of the core sample will be affected. In order to make the core sample break better, a scribing structure is provided on the articulated slider 243, and the scribing structure is used to scribe lines on the surface of the sample. Specifically, the scribing structure is usually made of a wear-resistant material with high hardness. When the first cylinder body 230 and the second cylinder body 240 rotate relative to each other, the second rotating block 249 restricts the movement of the articulated slider 243, so that the scribing structure on the articulated slider 243 contacts the core sample. When the first cylinder body 230 and the second cylinder body 240 rotate relative to each other, the scribing structure rotates around the core sample, and the sharp edge of the scribing structure contacts the surface of the core sample. With the frictional force generated by rotation and the appropriate downward pressing force of the articulated slider 243, a circular line mark is scribed on the core sample. At the same time, the first sliding bolt 233 near the scribing structure applies an extrusion force to the core sample, and this extrusion makes the local stress at the scribed part of the core sample increase significantly. Since the scribing structure causes certain damage and stress concentration on the surface of the core sample, and at the same time, the extrusion of the first sliding bolt 233 on the core sample makes the stress at the scribed part of the core sample exceed its own tensile strength limit, so that the core sample breaks at the scribed part. By setting the scribing structure, precise fracture of the core sample can be achieved, avoiding the irregular fracture situation that may occur in the traditional method, which is beneficial to the subsequent neat and standardized treatment of the core sample, and at the same time reduces the damage to the overall structure of the core sample, ensuring that other parts except the scribed fracture part remain relatively intact, and providing a more accurate sample for subsequent geological analysis.

[0060] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that it is within the scope described in this specification.

[0061] The above-described embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A geotechnical engineering exploration drilling device, characterized in that, Comprising: An inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder are arranged along a first axis. The outer peripheral wall surface of the inner cylinder is in close contact with the inner peripheral wall surface of the outer cylinder. The inner cylinder includes a plurality of sub-cylinders, and the plurality of sub-cylinders are connected end to end in pairs along the first axis. The adjacent sub-cylinders are detachably connected. The plurality of sub-cylinders are used to take out samples in segments. The first axis is the central axis of the outer cylinder. During the use of the geotechnical engineering exploration drilling device, there are a sampling stage, a stage of taking out the inner cylinder, and a stage of taking out the sample. When in the sampling stage, the geotechnical engineering exploration drilling device enters the geotechnical sampling. When in the stage of taking out the inner cylinder, the inner cylinder is taken out from the outer cylinder. When in the stage of taking out the sample, the core sample is taken out from the inner cylinder. A sleeve is arranged inside any one of the sub-cylinders, and the outer peripheral wall surface of the sleeve is in close contact with the inner peripheral wall surface of the sub-cylinder. When in the sampling stage and the stage of taking out the inner cylinder, the sleeve and the sub-cylinder are relatively stationary. When in the stage of taking out the sample, the sleeve and the sub-cylinder can rotate relatively. The sleeve is used to accommodate the sample. The sleeve is divided into a first sleeve and a second sleeve. The first sleeve and the second sleeve are rotationally connected through a hinge shaft, so that after the sleeve is taken out, the first sleeve and the second sleeve can rotate and separate. The inner cylinder includes at least adjacent first and second sub-cylinders. A shrapnel ring is arranged between the first sub-cylinder and the second sub-cylinder. One end of the shrapnel ring is detachably connected to one end of the first sub-cylinder, and the other end of the shrapnel ring is rotationally connected to one end of the second sub-cylinder. At least two hinge balls are arranged at one end of the shrapnel ring close to the first sub-cylinder, and at least two hinge sliders are arranged at one end of the inner peripheral wall surface of the first sub-cylinder close to the second sub-cylinder. The hinge ball and the hinge slider are detachably connected. The shrapnel ring has a first state and a second state. When in the first state, the first sub-cylinder and the second sub-cylinder rotate relatively, and the two ends of the shrapnel ring gradually move away. The detachably connected end of the shrapnel ring always contacts the first sub-cylinder. When in the second state, the first sub-cylinder and the second sub-cylinder are separated. At this time, the detachably connected end of the shrapnel ring and the first sub-cylinder are separated, and the shrapnel ring no longer contacts the first sub-cylinder.

2. The geotechnical engineering investigation drilling device according to claim 1, characterized in that, At least two squeezing members are arranged at one end of the shrapnel ring close to the second sub-cylinder. In the stage of taking out the sample, the shrapnel ring drives the squeezing members to squeeze the sample so that the sample breaks.

3. A geotechnical engineering exploration drilling device according to claim 2, characterized in that, A top block is arranged between the squeezing member and the outer cylinder. In the sampling stage, the squeezing member pushes the top block, so that the outer cylinder and the plurality of sub-cylinders do not rotate relatively. In the stage of taking out the inner cylinder and the stage of taking out the sample, the shrapnel ring drives the squeezing member to move, so that the squeezing member no longer pushes the top block, and the outer cylinder and the plurality of sub-cylinders rotate relatively.

4. A geotechnical engineering exploration drilling device according to claim 2, characterized in that, The sub-cylinder includes a first cylinder and a second cylinder. The second cylinder is rotatably sleeved on the first cylinder. When the first cylinder and the second cylinder rotate relatively, the squeezing member rotates relative to the sample.

5. A geotechnical engineering exploration drilling device according to claim 4, characterized in that, At least two second sliding bolts and at least two second rotating blocks are provided between the first cylinder and the second cylinder. The second sliding bolts are used to limit the relative movement of the first cylinder and the second cylinder along the first axis, and the second rotating blocks are used to limit the relative rotation of the first cylinder and the second cylinder during the sampling stage.

6. A geotechnical engineering exploration drilling device according to claim 5, characterized in that, At least two of the articulated sliders are provided with sliding protrusions, and at least two of the second rotating blocks are provided with sliding grooves. The sliding grooves and the sliding protrusions are used to cause the articulated sliders to drive the second rotating blocks to move along the first axis when moving perpendicular to the first axis.

7. A geotechnical engineering exploration drilling device according to claim 5, characterized in that, The articulated slider is provided with a scribing structure, and the scribing structure is used to scribe on the surface of the sample.

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