Intelligent sensing device for geotechnical engineering

Abstract

The invention discloses a geotechnical engineering intelligent sensing device, and belongs to the technical field of soil detection, the geotechnical engineering intelligent sensing device comprises a mounting bracket and a detection mechanism, the mounting bracket comprises a driving box slidably arranged, the driving box is rotatably connected with the detection mechanism, the detection mechanism comprises a drill rod and an internal core body, and the internal core body is slidably connected with the drill rod; the inner core body comprises an inner sleeve and a matched circular ring which are rotationally matched, a circular truncated cone part is slidably arranged in the inner sleeve, a plurality of detection heads are slidably arranged on the inner sleeve and located on the periphery of the circular truncated cone part, a plurality of push rods are slidably arranged outside the inner sleeve, and a plurality of hemispherical plugs are slidably arranged on the push rods; meanwhile, the sensing detection mechanism is arranged in the drill rod, when the drill rod drills into soil at different depths, the detection head can move outwards and make contact with the soil for detection, the detection head is retracted after detection is finished, the detection head is further protected, and damage to the detection head due to direct drilling is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of soil detection, and in particular to an intelligent sensing device for geotechnical engineering. Background Art

[0002] Geotechnical engineering is an important branch of civil engineering. It mainly studies the engineering properties of rocks, soil and groundwater and their application in engineering construction. It covers the entire process of investigation, design, construction, monitoring, etc. The core goal is to ensure the safety and stability of engineering structures.

[0003] Geotechnical engineering requires soil temperature and humidity testing, primarily using sensors. This is a core technical approach to ensuring project safety, optimizing design, and dynamically regulating the process. Testing methods include directly inserting the testing equipment into the soil layer for testing, or pre-digging a foundation pit, inserting the testing equipment into the pit, and then backfilling the soil. Geotechnical engineering requires soil-contact sensors, including resistive humidity sensors, which measure changes in soil resistance through dual electrodes inserted into the soil to infer moisture content; probe-type multi-parameter sensors, which use stainless steel probes inserted into the soil to simultaneously measure humidity, temperature, conductivity, and other parameters, making them suitable for layered monitoring; soil compaction sensors, which use mechanical probes to penetrate the soil to measure resistance and assess root growth conditions and tillage difficulty; and soil temperature sensors, which use thermal sensors buried in the soil to accurately measure temperature through changes in resistance.

[0004] However, in actual operation, it is sometimes necessary to detect soil layers at different depths, and the sensing detection equipment needs to be in direct contact with the soil layer. If the soil is hard, the sensing equipment may be damaged during the insertion process, resulting in certain losses. Summary of the Invention

[0005] The present invention provides a geotechnical engineering intelligent sensing device, which can solve the problem in the prior art of needing to detect soil layers of different depths.

[0006] An intelligent sensing device for geotechnical engineering includes a mounting bracket and a detection mechanism, wherein the mounting bracket includes a slidably mounted drive box, and the drive box is rotatably connected to the detection mechanism; The detection mechanism includes a drill rod and an internal core body, which is slidably connected to the drill rod. The internal core body includes an internal sleeve and a matching ring that rotate together. A round table piece is slidably provided inside the internal sleeve. Several detection heads are slidably provided on the outer periphery of the round table piece on the internal sleeve. Several push rods are slidably provided outside the internal sleeve. Several hemispherical plugs are slidably provided on the push rods.

[0007] Furthermore, the mounting bracket includes a base, on which a first threaded rod is rotatably provided and a first limit rod is fixedly provided, the first threaded rod is connected to a first motor, the first motor drives the first threaded rod to rotate, the first threaded rod is threadedly fitted with a drive box, the drive box is rotatably provided with a connecting head, and a motor is provided in the drive box to drive the connecting head to rotate.

[0008] Furthermore, the drill rod is hollow inside, and a connecting part is detachably provided on the outside of the drill rod. The internal core includes a moving rod and an internal sleeve. The moving rod is located inside the drill rod, and the end of the moving rod is coaxially and fixedly provided with a knob. A U-shaped part is slidably provided on the moving rod, and a circular ring part is fixedly provided at the bottom of the U-shaped part. The circular ring part is sleeved on the outside of the moving rod, and a number of push rods are arranged in a circular array on the circular ring part. The push rods are slidably connected to the internal sleeve. A sealing cover is detachably provided at the end of the internal sleeve, and the moving rod is threadedly connected to the sealing cover.

[0009] Furthermore, the moving rod is provided with an external thread, an end plate is rotatably provided at the end of the moving rod, a matching ring is rotatably provided outside the inner sleeve near the sealing cover, and limit blocks are symmetrically provided on the matching ring.

[0010] Furthermore, a frustum is fixedly provided on the movable rod near the sealing cover end, and the frustum rotates coaxially with the movable rod. A fixed bracket is also fixed in the internal sleeve, and a plurality of second springs are provided in a circular array on the fixed bracket. The other ends of the plurality of second springs are fixedly provided with a first mounting plate, and a detection head is fixed on the plurality of first mounting plates.

[0011] Furthermore, a plurality of through holes are provided on the inner sleeve at positions corresponding to the detection head, and the detection head is located in the through holes.

[0012] Furthermore, several of the push rods are slidably connected to the internal sleeve, the outer circumferential array of the internal sleeve is provided with a slide groove, several push rods are slidably arranged in the slide groove, the ends of several push rods are fixed with a ramp, a stop block is fixed on the ramp, and the inclined surface of the ramp is slidably connected to the limit groove with a hemispherical plug.

[0013] Furthermore, a first spring is provided at the bottom of the hemispherical plug, and a baffle is fixedly provided on the inner sleeve between the hemispherical plug and the stop block.

[0014] Furthermore, a window is provided on the matching ring, and a clamping block is fixedly provided on the inner sleeve in the window.

[0015] Furthermore, the matching ring is symmetrically provided with card slots at both ends of the window, and the card blocks can be respectively engaged with the card slots.

[0016] Beneficial effects

[0017] 1. The present invention is provided with a drill rod, which can be rotated to drill into the soil layer. At the same time, the sensing detection mechanism is arranged inside the drill rod. When the drill rod drills into the soil at different depths, the detection head can move outward, contact with the soil for detection, and retract after the detection is completed, thereby further protecting the detection head and avoiding damage to the detection head caused by direct drilling. When the round table moves forward, it gradually contacts and squeezes the first mounting plate, the second spring is compressed, the first mounting plate approaches the inner sleeve, and the detection head moves outward until it extends out of the drill rod. When the round table is retracted backward, the compressed second spring gradually recovers its deformation, pulling the middle of the detection head back, and finally retracting it into the inside of the drill rod.

[0018] 2. At the same time, during the drilling process of the drill rod, the present invention adopts a hemispherical plug to cover the circular hole provided on the drill rod to prevent soil from entering the drill rod during the drilling process. The hemispherical plug will gradually move along the inclined surface of the inclined platform. At this time, the hemispherical plug will be raised until the circular hole is blocked. At this time, the drill rod drills downward and soil will not flow into the circular hole in large quantities. During the movement of the hemispherical plug, the first spring is stretched. When the push rod moves in the opposite direction, the first spring will pull the hemispherical plug back to achieve the reset of the hemispherical plug.

[0019] 3. The present invention is also provided with an adjustment mechanism. The internal sleeve rotates a certain angle so that the detection head is aligned with the circular hole. The detection head can be moved outward in conjunction with the forward movement of the detection head. When the card block is fixed to the card slot on the other side, the internal sleeve rotates a certain angle so that the hemispherical plug is aligned with the circular hole. The circular hole can be blocked by raising the hemispherical plug, thereby realizing the coordination between the detection head and the hemispherical plug and the circular hole respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 Schematic diagram of the detection mechanism structure of the present invention; Figure 4 This is a schematic diagram of the internal core structure of the present invention; Figure 5 This is an enlarged schematic diagram of the structure of part A of the present invention; Figure 6 This is an enlarged schematic diagram of the structure of part B of the present invention; Figure 7 This is a schematic diagram of the structure of the inner core end portion of the present invention; Figure 8 It is a cross-sectional view of the detection mechanism of the present invention; Figure 9 This is an enlarged schematic diagram of the structure of part C of the present invention; Figure 10 Schematic diagram of the internal structure of the detection mechanism of the present invention; Figure 11 This is a schematic diagram of the limiting block of the present invention.

[0021] Description of reference numerals: 100, mounting bracket; 200, detection mechanism; 101, base; 102, first motor; 103, first threaded rod; 104, first limit rod; 105, drive box; 106, connector; 201, drill rod; 202, connector; 203, knob; 204, moving rod; 205, U-shaped member; 206, inner sleeve; 207, external thread; 208, end plate; 209, sealing cover; 210, Matching ring; 211, limit block; 212, circular ring member; 213, push rod; 214, inclined platform; 215, stop block; 216, slide groove; 217, hemispherical plug; 218, guardrail; 219, through hole; 220, detection head; 221, window; 222, slot; 223, block; 224, circular hole; 225, round platform member; 226, first mounting plate; 227, second spring; 228, fixed bracket. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] like Figure 1 As shown, an embodiment of the present invention provides a geotechnical engineering intelligent sensing device, including a mounting bracket 100 and a detection mechanism 200, as shown in FIG. Figure 2 As shown, the mounting bracket 100 includes a base 101, on which a first threaded rod 103 is rotatably provided and a first limiting rod 104 is fixedly provided. The first threaded rod 103 is connected to a first motor 102, and the first motor 102 drives the first threaded rod 103 to rotate. The first threaded rod 103 is threadedly fitted with a drive box 105, and the drive box 105 is rotatably provided with a connector 106, and a motor is provided in the drive box 105 to drive the connector 106 to rotate.

[0024] When in use, the first motor 102 is used to realize the upward and downward movement of the entire device, and the driving box 105 drives the drill rod 201 to rotate as a whole to drill into the soil at different depths.

[0025] When detecting the humidity or temperature of the soil, the detection equipment needs to enter the soil at different depths and detect the soil layers at different positions. Therefore, we provide a drill rod 201, which can be rotated to drill into the soil layer and detect the soil at different depths.

[0026] like Figure 3 and Figure 4 As shown, the detection mechanism 200 includes a drill rod 201 and an internal core. The drill rod 201 is hollow inside, and a connector 202 is detachably provided on the outside of the drill rod 201. The detachable connection method includes fixing with bolts, clamping, etc. The detection mechanism 200 is fixedly connected to the connector 106 through the connector 202. The internal core includes a moving rod 204 and an internal sleeve 206. The moving rod 204 is located inside the drill rod 201. The end of the moving rod 204 is coaxial and fixed with a knob 203. A U-shaped piece 205 is slidably provided on the moving rod 204. The U-shaped piece 205 can move up and down along the moving rod 204. The U-shaped piece 20 5 is fixedly provided with a circular ring member 212 at the bottom, and the circular ring member 212 is sleeved on the outside of the moving rod 204. A plurality of push rods 213 are arranged in a circumferential array on the circular ring member 212. The push rods 213 are slidably connected to the inner sleeve 206. A sealing cover 209 is detachably provided at the end of the inner sleeve 206. The moving rod 204 is threadedly connected to the sealing cover 209. Specifically, the moving rod 204 is provided with an external thread 207. The end of the moving rod 204 is rotatably provided with an end plate 208. A matching circular ring 210 is rotatably provided on the outside of the inner sleeve 206 near the sealing cover 209, and a limit block 211 is symmetrically provided on the matching circular ring 210.

[0027] like Figure 11 As shown, when in use, the internal core body is inserted as a whole into the drill rod 201. Limiting grooves corresponding to the limiting blocks 211 are provided on both sides of the drill rod 201. The limiting blocks 211 on the internal core body slide inward along the limiting grooves until they slide to the top of the limiting grooves. Under the action of the limiting blocks 211, the matching ring 210 is relatively fixed with the drill rod 201 and will not rotate. At this time, the moving rod 204 is rotated. Under the action of the external thread 207, the moving rod 204 can drive the end plate 208 to rotate forward together, thereby realizing the movement of the moving rod 204 on the internal sleeve 206.

[0028] At the same time, when the equipment is finished using, the connecting piece 202 can be removed first, and then the internal core can be taken out as a whole for cleaning. During the removal of the internal core, the end plate 208 can scrape off some of the dirt remaining inside the drill rod 201, and the sealing cover 209 and the end of the internal sleeve 206 can also be disassembled to facilitate cleaning the inside of the internal sleeve 206.

[0029] During actual operation, the sensing detection mechanism needs to be in contact with the soil layer in order to detect it. If the sensing detection mechanism is directly set on the drill rod 201, the drilling process of the drill rod 201 can easily cause damage to the sensing mechanism, affecting the service life of the equipment. Therefore, the present invention sets the sensing detection mechanism inside the drill rod 201. When the drill rod 201 drills to different depths in the soil, the sensing detection mechanism can move outward and contact with the soil for detection. After the detection is completed, it is retracted, further realizing the protection of the sensing detection mechanism and avoiding damage to the sensing detection mechanism due to direct drilling.

[0030] like Figure 8 As shown, a truncated platform 225 is fixedly provided on the end of the movable rod 204 near the sealing cover 209. The truncated platform 225 rotates coaxially with the movable rod 204. Figure 10 As shown, a fixing bracket 228 is fixed in the inner sleeve 206, and a plurality of second springs 227 are arranged in a circumferential array on the fixing bracket 228. The other ends of the plurality of second springs 227 are fixed with a first mounting plate 226, and the plurality of first mounting plates 226 are fixed with a detection head 220. The inner sleeve 206 is provided with a plurality of through holes 219 at positions corresponding to the detection heads 220. The detection heads 220 are located in the through holes 219. When the round table 225 moves forward, it gradually contacts the plurality of first mounting plates 226 and gradually contacts the plurality of first mounting plates 226. Several first mounting plates 226 are squeezed, the second spring 227 is compressed, the first mounting plates 226 gradually approach the inner sleeve 206, and the detection head 220 also moves outward until it extends out of the drill rod 201. A circular hole 224 is provided at the corresponding position of the drill rod 201 and the detection head 220. Several detection heads 220 move to the outside of the drill rod 201 through the circular hole 224. Similarly, when the round table 225 is retracted backward, the compressed second spring 227 gradually recovers its deformation, pulling the middle of the detection head 220 back, and finally retracting it into the inside of the drill rod 201.

[0031] Long-term contact of the detection head 220 with the soil causes oxidation of the metal probe, so corrosion-resistant materials such as 316L stainless steel need to be selected. During use, some dirt may remain on the surface of the detection head 220 during the retraction process. However, since there is almost no gap between the detection head 220 and the circular hole 224, the dirt on its surface can be scraped off by the circular hole 224 during the retraction process of the detection head 220, ensuring that there is almost no residual dirt on its surface. However, the head of the detection head 220 cannot be scraped, and a smooth material can be used to avoid excessive dirt remaining on its surface.

[0032] In actual use, since the drill rod 201 is provided with a penetrating circular hole 224, when the drill rod 201 is drilled, soil can easily enter the interior of the drill rod 201 from the circular hole 224, thereby causing blockage. To address the above problem, this embodiment provides a hemispherical plug 217 to cover the circular hole 224, thereby preventing soil from entering the interior of the drill rod 201 during the drilling process.

[0033] like Figure 4 and Figure 5 As shown, several push rods 213 are all slidably connected to the internal sleeve 206, and the outer circumferential array of the internal sleeve 206 is provided with a slide groove 216. Several push rods 213 are slidably arranged in the slide groove 216. The ends of several push rods 213 are fixed with a ramp 214, and a stopper 215 is fixed on the ramp 214. The inclined surface of the ramp 214 is slidably connected with a hemispherical plug 217 in a limiting groove. There is also a first spring at the bottom of the hemispherical plug 217. A guard plate 218 is also fixed on the internal sleeve 206 between the hemispherical plug 217 and the stopper 215. When the hemispherical plug 217 is aligned with the circular hole 224, when the push rod 213 is pushed forward synchronously, the inclined platform 214 will slide in the chute 216, and the hemispherical plug 217 will not move forward synchronously with the inclined platform 214 due to the obstruction of the guardrail 218. As the inclined platform 214 moves, the hemispherical plug 217 will gradually move to the top of the inclined platform 214. At this time, the hemispherical plug 217 will be raised until it blocks the circular hole 224. At this time, the drill rod 201 drills downward, and soil will not flow into the circular hole 224 in large quantities. During the movement of the hemispherical plug 217, the first spring is stretched. When the push rod 213 moves in the opposite direction, the first spring will pull the hemispherical plug 217 back, realizing the reset of the hemispherical plug 217. The shape of the hemispherical plug 217 is adapted to the circular hole 224. When the hemispherical plug 217 moves toward the circular hole 224, it can almost completely cover the circular hole.

[0034] When in use, the detection head 220 needs to be aligned with the circular hole 224 to facilitate movement outside the drill rod 201 for detection. The hemispherical plug 217 also needs to be aligned with the circular hole 224 to facilitate blocking the circular hole 224. However, the detection head 220 and the hemispherical plug 217 cannot be aligned with the circular hole 224 at the same time, otherwise interference will occur, making it impossible for one of them to move normally. Therefore, the present invention solves the above problem by providing an adjustment mechanism.

[0035] like Figure 6 and Figure 7 As shown, the matching ring 210 is fixed relative to the drill rod 201 under the action of the limit block 211 and will not rotate, but the inner sleeve 206 is rotatably connected to the matching ring 210, and the inner sleeve 206 can rotate relative to the matching ring 210, as shown in FIG. Figure 6As shown, a window 221 is opened on the matching ring 210, and a clamping block 223 is fixed in the window 221 on the inner sleeve 206. The matching ring 210 is symmetrically provided with clamping grooves 222 at both ends of the window 221. When the inner sleeve 206 is rotated, the clamping blocks 223 can be respectively engaged with the clamping grooves 222, so that the inner sleeve 206 is relatively fixed with the matching ring 210 after rotating a certain angle. When the clamping block 223 is fixed with the clamping groove 222 on one side, the inner sleeve 206 rotates a certain angle. A certain angle is set so that the detection head 220 is aligned with the circular hole 224, and then the detection head 220 moves forward to realize the outward movement of the detection head 220. When the block 223 is fixed to the slot 222 on the other side, the internal sleeve 206 rotates a certain angle so that the hemispherical plug 217 is aligned with the circular hole 224. The circular hole 224 can be blocked by raising the hemispherical plug 217. It should be noted that several hemispherical plugs 217 and several detection heads 220 are arranged in a circular array on the internal sleeve 206.

[0036] The detection head 220 of this embodiment includes but is not limited to a resistive humidity sensor, which measures the change in soil resistance by inserting two electrodes into the soil to infer the moisture content; a probe-type multi-parameter sensor is used to detect humidity, temperature, conductivity, etc.

[0037] The sensing device of this embodiment preferably detects soil with low humidity. If a small amount of soil may enter the interior during the detection process, the device can be disassembled for internal cleaning to avoid internal soil accumulation.

[0038] In this embodiment, the number of detection heads 220, hemispherical plugs 217, and circular holes 224 is the same, and the multiple detection heads 220, hemispherical plugs 217, and circular holes 224 are arranged in a circular array. During rotation, the detection heads 220 and hemispherical plugs 217 can correspond to the circular holes 224 to achieve different functions. Furthermore, in this embodiment, the shapes of the detection heads 220, hemispherical plugs 217, and circular holes 224 are not limited. During use, the detection heads 220 and hemispherical plugs 217 can be cylindrical, rectangular, or other shapes. It should be noted that the shape of the circular holes 224 must be compatible with the shapes of the detection heads 220 and hemispherical plugs 217 to avoid large gaps during the matching process, which could cause soil to flow in.

[0039] The detection method of the sensor device in this embodiment includes the following steps: Step 1: First, the first motor 102 is used to realize the up and down movement of the entire device, and the drive box 105 drives the drill rod 201 to rotate as a whole, drilling into the soil at different depths; Step 2: During the drilling process of the drill rod 201, when the block 223 is fixed to the slot 222 on one side, the internal sleeve 206 rotates a certain angle so that the hemispherical plug 217 is aligned with the circular hole 224. When the push rod 213 is pushed forward synchronously, the inclined platform 214 will slide in the slide groove 216, and the hemispherical plug 217 will not move forward synchronously with the inclined platform 214 due to the obstruction of the fence 218. As the inclined platform 214 moves, the hemispherical plug 217 will gradually move to the top of the inclined platform 214. At this time, the hemispherical plug 217 will be raised until it blocks the circular hole 224. At this time, the drill rod 201 drills downward, and soil will not flow into the circular hole 224 in large quantities. During the movement of the hemispherical plug 217, the first spring is stretched. When the push rod 213 moves in the opposite direction, the first spring will pull the hemispherical plug 217 back to achieve the reset of the hemispherical plug. Step 3: After rotating to the specified depth, the block 223 is fixed to the slot 222 on the other side, and the internal sleeve 206 rotates a certain angle so that the detection head 220 is aligned with the circular hole 224. When the frustum 225 moves forward, it gradually contacts and squeezes the first mounting plates 226. The second spring 227 is compressed, and the first mounting plates 226 gradually approach the internal sleeve 206. The detection head 220 also moves outward until it extends out of the drill rod 201. Circular holes 224 are provided at the corresponding positions of the drill rod 201 and the detection heads 220. Several detection heads 220 move to the outside of the drill rod 201 through the circular holes 224. Similarly, when the frustum 225 is retracted backward, the compressed second spring 227 gradually recovers its deformation, pulling the detection head 220 back to the middle, and finally retracting it into the inside of the drill rod 201.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as limiting the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An intelligent sensing device for geotechnical engineering, characterized in that: It comprises a mounting bracket (100) and a detection mechanism (200), wherein the mounting bracket (100) comprises a slidably provided drive box (105), and the drive box (105) is rotationally connected to the detection mechanism (200); The detection mechanism (200) includes a drill rod (201) and an internal core body, the internal core body is slidably connected to the drill rod (201), the internal core body includes a rotatably matched internal sleeve (206) and a matching ring (210), a truncated table (225) is slidably provided inside the internal sleeve (206), a plurality of detection heads (220) are slidably provided on the internal sleeve (206) and located on the outer periphery of the truncated table (225), a plurality of push rods (213) are slidably provided outside the internal sleeve (206), and a plurality of hemispherical plugs (217) are slidably provided on the push rods (213).

2. The geotechnical engineering intelligent sensing device according to claim 1, characterized in that: The mounting bracket (100) comprises a base (101), a first threaded rod (103) being rotatably provided on the base (101), and a first limiting rod (104) being fixedly provided thereon, a first motor (102) being connected to the first threaded rod (103), the first motor (102) driving the first threaded rod (103) to rotate, a drive box (105) being threadedly engaged on the first threaded rod (103), a connector (106) being rotatably provided on the drive box (105), and a motor being provided in the drive box (105) to drive the connector (106) to rotate.

3. The geotechnical engineering intelligent sensing device according to claim 1, characterized in that: The drill rod (201) is hollow inside, and a connector (202) is detachably provided on the outside of the drill rod (201). The internal core comprises a movable rod (204) and an internal sleeve (206). The movable rod (204) is located inside the drill rod (201). The end of the movable rod (204) is coaxially and fixedly provided with a knob (203). A U-shaped piece (205) is slidably provided on the movable rod (204). A circular ring piece (212) is fixedly provided at the bottom of the U-shaped piece (205). The circular ring piece (212) is sleeved on the outside of the movable rod (204). A plurality of push rods (213) are arranged in a circumferential array on the circular ring piece (212). The push rods (213) are slidably connected to the internal sleeve (206). A sealing cover (209) is detachably provided at the end of the internal sleeve (206). The movable rod (204) is threadedly connected to the sealing cover (209).

4. The geotechnical engineering intelligent sensing device according to claim 3, characterized in that: The movable rod (204) is provided with an external thread (207), and an end plate (208) is rotatably provided at the end of the movable rod (204). A matching ring (210) is rotatably provided outside the inner sleeve (206) near the sealing cover (209), and a limit block (211) is symmetrically provided on the matching ring (210).

5. The geotechnical engineering intelligent sensing device according to claim 4, characterized in that: A truncated table member (225) is fixedly provided on the end of the movable rod (204) near the sealing cover (209), and the truncated table member (225) rotates coaxially with the movable rod (204). A fixed bracket (228) is fixedly provided in the inner sleeve (206), and a plurality of second springs (227) are provided in a circular array on the fixed bracket (228). The other ends of the plurality of second springs (227) are fixedly provided with a first mounting plate (226), and a detection head (220) is fixedly provided on the plurality of first mounting plates (226).

6. The geotechnical engineering intelligent sensing device according to claim 5, characterized in that: A plurality of through holes (219) are also provided on the inner sleeve (206) at locations corresponding to the detection head (220), and the detection head (220) is located in the through holes (219).

7. The geotechnical engineering intelligent sensing device according to claim 3, characterized in that: The plurality of push rods (213) are all slidably connected to the inner sleeve (206), the outer circumferential array of the inner sleeve (206) is provided with a slide groove (216), the plurality of push rods (213) are all slidably arranged in the slide groove (216), the ends of the plurality of push rods (213) are all fixedly provided with an inclined platform (214), a stopper (215) is fixedly provided on the inclined platform (214), and a hemispherical plug (217) is slidably connected to a limit groove on the inclined surface of the inclined platform (214).

8. The geotechnical engineering intelligent sensing device according to claim 7, characterized in that: A first spring is also provided at the bottom of the hemispherical plug (217), and a baffle (218) is fixedly provided on the inner sleeve (206) between the hemispherical plug (217) and the stopper (215).

9. The geotechnical engineering intelligent sensing device according to claim 8, characterized in that: A window (221) is provided on the matching ring (210), and a clamping block (223) is fixedly provided on the inner sleeve (206) in the window (221).

10. The geotechnical engineering intelligent sensing device according to claim 9, characterized in that: The matching ring (210) is symmetrically provided with slots (222) at both ends of the window (221), and the clamping blocks (223) can be respectively engaged with the slots (222).

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