Automatic detection device for pile bottom karst cave

Abstract

The utility model provides a pile bottom karst cave automatic detection device which comprises a base, a support, a driving mechanism and a meter counter, and the top of the base is rotationally provided with a take-up roller; the bracket is arranged on the base, a fixed pulley is arranged on the bracket, one end of the cable is fixed on the take-up roller, and the other end of the cable is connected with a probe through electric melting after passing through the fixed pulley; the driving mechanism is arranged on the base, and the power output end of the driving mechanism is connected with the take-up roller; the meter counter is arranged on the support, and the cable passes through the meter counter. According to the utility model, through the arrangement of the support and the fixed pulley, the lifting of the probe can be conveniently realized in a cable winding and unwinding manner, and meanwhile, through the arrangement of the driving mechanism, the winding roller can be conveniently driven to rotate, so that the automatic winding and unwinding of the cable can be conveniently realized, and compared with manual cable winding and unwinding, the labor burden of workers is greatly reduced; and meanwhile, the take-up and pay-off rate of the cable can be improved, and then the detection efficiency of the pile bottom karst cave is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection equipment, and more specifically, relates to an automatic detection device for pile bottom karst caves. Background Art

[0002] Pile bottom karst caves refer to underground karst caves encountered during the construction of pile foundations. These karst caves may threaten the stability of the pile foundation. The methods for dealing with pile bottom karst caves usually include the following steps:

[0003] Advance drilling of pile positions: Drilling is carried out before pile foundation construction to find out the distribution of karst caves at the pile positions and determine the shape, size and location of the karst caves.

[0004] Drilling to the top of the cave: Use an impact drill to drill to the top of the cave. When the water level changes in the borehole or the drilling speed increases significantly, it means that the drill bit has passed through the top of the cave and entered the interior of the cave.

[0005] Throwing clay and stone: lift the pile hammer and throw clay and stone into the pile foundation hole to fill the cave and compact it by hammering.

[0006] Continue drilling: Continue drilling with short strokes, alternating between dumping and drilling during the drilling process until the cave floor is penetrated.

[0007] Secondary detection of borehole wall: Use a boremeter or downhole television to detect the size and location of karst cracks and small caves on the borehole wall.

[0008] Making grouting pipes: Make grouting pipes according to the detection results and weld them to the inside of the steel cage to ensure that the outlet position of the grouting pipes corresponds to the position of the karst cracks or small caves.

[0009] Grouting: Inject cement slurry into karst cracks or small caves through grouting pipes to enhance the stability of the pile foundation.

[0010] When detecting karst caves at the bottom of piles, a karst cave detector is often needed. The bracket used by the current pile bottom karst cave detector is a manual retractable bracket, which is inefficient during on-site detection and extremely labor-intensive when encountering long piles. In addition, when detecting the depth of karst caves, the existing karst cave detector is prone to cause a deviation between the recorded hole depth and the actual hole depth. Utility Model Content

[0011] The utility model aims to provide an automatic detection device for pile bottom karst caves, so as to improve the detection efficiency of pile bottom karst caves.

[0012] To achieve the above object, the technical solution adopted by the utility model is: to provide an automatic detection device for karst caves at the bottom of piles, including a base, a bracket, a driving mechanism and a length meter. Among them, a wire winding roller is rotatably arranged on the top of the base; the bracket is arranged on the base, and a fixed pulley is arranged on the bracket. One end of the cable is fixed on the wire winding roller, and one end of the cable is electrically fused with a probe after passing through the fixed pulley; the driving mechanism is arranged on the base, and the power output end of the driving mechanism is connected with the wire winding roller; the length meter is arranged on the bracket, and the cable passes through the length meter.

[0013] In a possible implementation manner, two first mounting plates are fixed on the base, the first mounting plates are arranged at intervals, and the wire winding roller is rotatably arranged between the two first mounting plates; the driving mechanism includes a motor, a speed reduction assembly and a driven rod, the driven rod is connected with the wire winding roller, and the driven rod extends to one side of one of the mounting plates; the power output end of the motor is connected with the speed reduction assembly, the speed reduction assembly is connected with the driven rod, and the motor can drive the driven rod to rotate.

[0014] In a possible implementation manner, the speed reduction assembly includes a driving wheel, a driven wheel, a driving rod, two second mounting plates and a transmission belt. The driving wheel is arranged at the power output end of the motor, the two second mounting plates are arranged at intervals on the top of the base, the driven wheel is rotatably arranged between the two second mounting plates, the driving wheel meshes with the driven wheel, the driving rod is connected with the driven wheel, and the driving rod and the driven wheel are coaxially arranged. The driving rod extends to one side of one of the second mounting plates, and the transmission belt is sleeved on the driving rod and the driven rod. The diameter of the driving wheel is smaller than that of the driven wheel.

[0015] In a possible implementation manner, the bracket includes a lifting sleeve and a telescopic sleeve. The lifting sleeve is vertically arranged on the top of the base, the telescopic sleeve is horizontally arranged on the top of the lifting sleeve, the lifting sleeve is used to drive the telescopic sleeve to rise or fall, the fixed pulley is arranged on the telescopic sleeve, and the telescopic sleeve is used to drive the probe to approach or move away from the base.

[0016] In a possible implementation, the lifting sleeve includes a lifting pipe and a lifting rod. A pivot hole is provided at the top of the base, and an annular clamping groove is provided on the hole wall of the pivot hole. An annular clamping plate is provided at the bottom of the lifting pipe. The lifting pipe is rotatably arranged in the pivot hole, and the clamping plate is inserted into the clamping groove. A fixing hole is provided on the base, and the fixing hole communicates with the clamping groove. A fixing bolt is screwed in the fixing hole and abuts against the clamping plate, so that the lifting pipe is fixed to the base. The lifting rod is inserted into the lifting pipe. A first limiting hole is provided on the side wall of the lifting pipe, and a first limiting bolt is screwed in the first limiting hole. The first limiting bolt abuts against the lifting rod to fix the lifting rod relative to the lifting pipe. The telescopic sleeve is arranged at the top of the lifting rod.

[0017] In a possible implementation, the telescopic sleeve includes a telescopic pipe, a telescopic rod and a telescopic driving assembly. The telescopic pipe is fixedly arranged at the top of the lifting rod. The telescopic rod is inserted into the telescopic pipe. The telescopic driving assembly is connected to the telescopic rod and is used to drive the telescopic rod to extend or retract into the telescopic pipe. The fixed pulley is arranged on the telescopic rod, and the meter is arranged on the telescopic pipe.

[0018] In a possible implementation, the telescopic driving assembly includes a spring, a driving cable, a cable take-up wheel, two third mounting plates and a second limiting bolt. The spring is arranged in the telescopic pipe. One end of the spring is connected to the telescopic pipe, and the other end of the spring is connected to the telescopic rod. When the spring is in a natural state, the part of the telescopic rod extending out of the telescopic pipe reaches the maximum length. The third mounting plates are arranged on the base at intervals. The cable take-up wheel is rotatably arranged between the third mounting plates. One end of the driving cable is connected to the cable take-up wheel, and the other end of the driving cable is connected to the telescopic rod. A second limiting hole is provided on the third mounting plate, and the second limiting bolt is screwed in the second limiting hole.

[0019] In a possible implementation, the base includes a bottom plate and support legs arranged at the four corners of the bottom plate. The length of the support legs is adjustable.

[0020] In a possible implementation, a threaded hole is provided at each of the four corners of the bottom plate. The support legs are threaded rods, and the threaded rods are screwed into the threaded holes.

[0021] The beneficial effects of the automatic pile bottom karst cave detection device provided by the present utility model are as follows: Compared with the prior art, by setting up a bracket and a fixed pulley, the present utility model facilitates the lifting and lowering of the probe by means of retracting and releasing the cable. At the same time, by setting up a driving mechanism, it is convenient to drive the wire winding roller to rotate, thereby facilitating the automatic retraction and release of the cable. Compared with manually retracting and releasing the cable, the labor burden of the staff is greatly reduced, and the retraction and release rate of the cable can be improved, thereby improving the detection efficiency of the pile bottom karst cave. Also, by setting up a length meter, it is convenient to record the extended length of the cable, improving the detection efficiency of the karst cave depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of one angle of the automatic pile bottom karst cave detection device provided by the embodiment of the present utility model;

[0024] Figure 2 It is a schematic structural diagram of another angle of the automatic pile bottom karst cave detection device provided by the embodiment of the present utility model;

[0025] Figure 3 It is a schematic structural diagram of the driving mechanism provided by the embodiment of the present utility model;

[0026] Figure 4 It is a schematic structural diagram of the telescopic driving assembly provided by the embodiment of the present utility model.

[0027] Among them, the reference numerals in the drawings are as follows:

[0028] 1, base; 3, driving mechanism; 4, length meter; 5, probe;

[0029] 101, wire winding roller; 102, first mounting plate; 103, bottom plate; 104, support leg;

[0030] 201, fixed pulley; 202, cable; 203, telescopic sleeve; 204, lifting sleeve; 205, lifting pipe; 206, lifting rod; 207, fixing bolt; 208, first limit bolt; 209, telescopic pipe; 210, telescopic rod; 211, telescopic driving assembly; 212, spring; 213, driving cable; 214, cable receiving wheel; 215, third mounting plate; 216, second limit bolt;

[0031] 301. Motor; 302. Reduction assembly; 303. Driven rod; 304. Driving wheel; 305. Driven wheel; 306. Second mounting plate; 307. Driving rod; 308. Transmission belt. Detailed implementation manners

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] It should be further noted that the drawings and embodiments of the present utility model mainly describe and explain the concept of the present utility model. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems, etc. may not be completely described. However, on the premise that those skilled in the art understand the concept of the present utility model, those skilled in the art can implement the above specific forms and settings in a well-known manner.

[0034] When an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] The orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 the present utility model.

[0036] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, and the meaning of "several" is one or more, unless otherwise specifically defined.

[0037] Now, the pile bottom karst cave automatic detection device provided by the present utility model will be described.

[0038] Please refer to Figure 1 and Figure 2, the automatic detecting device for karst caves at the bottom of piles includes a base 1, a bracket, a driving mechanism 3 and a length meter 4. Among them, a wire winding roller 101 is rotatably arranged on the top of the base 1; the bracket is arranged on the base 1, and a fixed pulley 201 is arranged on the bracket. One end of a cable 202 is fixed on the wire winding roller 101, and one end of the cable 202 is electrically fused with a probe 5 after passing through the fixed pulley 201; the driving mechanism 3 is arranged on the base 1, and the power output end of the driving mechanism 3 is connected with the wire winding roller 101; the length meter 4 is arranged on the bracket, and the cable 202 passes through the length meter 4.

[0039] The beneficial effects of the automatic detecting device for karst caves at the bottom of piles provided in this embodiment are as follows: Compared with the prior art, the automatic detecting device for karst caves at the bottom of piles provided in this embodiment is convenient for realizing the lifting of the probe 5 by means of winding and unwinding the cable 202 by setting the bracket and the fixed pulley 201. At the same time, by setting the driving mechanism 3, it is convenient to drive the wire winding roller 101 to rotate, and thus it is convenient to realize the automatic winding and unwinding of the cable 202. Compared with manually winding and unwinding the cable 202, the labor burden of the staff is greatly reduced, and at the same time, the winding and unwinding rate of the cable 202 can be improved, and further the detection efficiency of karst caves at the bottom of piles can be improved. Also, by setting the length meter 4, it is convenient to record the extended length of the cable 202, and the detection efficiency of the depth of the karst cave is improved.

[0040] In this embodiment, two first mounting plates 102 are fixed on the base 1, the first mounting plates 102 are arranged at intervals, and the wire winding roller 101 is rotatably arranged between the two first mounting plates 102. The driving mechanism 3 includes a motor 301, a speed reducing assembly 302 and a driven rod 303. The driven rod 303 is connected with the wire winding roller 101, and the driven rod 303 extends to one side of one mounting plate. The power output end of the motor 301 is connected with the speed reducing assembly 302, and the speed reducing assembly 302 is connected with the driven rod 303. The motor 301 can drive the driven rod 303 to rotate. The setting of the speed reducing assembly 302 can prevent the wire winding roller 101 from rotating too fast, so that the probe 5 descends too fast, resulting in damage to the probe 5 when it touches the bottom.

[0041] Such as Figure 3As shown in the figure, the deceleration assembly 302 includes a driving wheel 304, a driven wheel 305, a driving rod 307, two second mounting plates 306 and a transmission belt 308. The driving wheel 304 is arranged at the power output end of the motor 301. The two second mounting plates 306 are spaced apart and arranged on the top of the base 1. The driven wheel 305 is rotatably arranged between the two second mounting plates 306. The driving wheel 304 meshes with the driven wheel 305. The driving rod 307 is connected to the driven wheel 305, and the driving rod 307 and the driven wheel 305 are coaxially arranged. The driving rod 307 extends to one side of one of the second mounting plates 306. The transmission belt 308 is sleeved on the driving rod 307 and the driven rod 303. The diameter of the driving wheel 304 is smaller than that of the driven wheel 305. The smaller diameter of the driving wheel 304 than that of the driven wheel 305 makes the angular velocity of the driving wheel 304 greater than that of the driven wheel 305, realizing the function of deceleration. Of course, in this embodiment, the diameters of the driving rod 307 and the driven rod 303 are the same, or the diameter of the driving rod 307 can be smaller than that of the driven rod 303, and the deceleration effect is better.

[0042] As Figure 2 shown, the bracket includes a lifting sleeve 204 and a telescopic sleeve 203. The lifting sleeve 204 is vertically arranged on the top of the base 1. The telescopic sleeve 203 is horizontally arranged on the top of the lifting sleeve 204. The lifting sleeve 204 is used to drive the telescopic sleeve 203 to rise or fall. The fixed pulley 201 is arranged on the telescopic sleeve 203. The telescopic sleeve 203 is used to drive the probe 5 to approach or move away from the base 1. The arrangements of the lifting sleeve 204 and the telescopic sleeve 203 can facilitate the adjustment of the position of the probe 5 and facilitate the probe 5 to enter the karst cave at the bottom of the pile.

[0043] Specifically, the lifting sleeve 204 includes a lifting tube 205 and a lifting rod 206. A pivot hole is provided on the top of the base 1. An annular clamping groove is provided on the inner wall of the pivot hole. An annular clamping plate is provided at the bottom of the lifting tube 205. The lifting tube 205 is rotatably arranged in the pivot hole. The clamping plate is inserted into the clamping groove. A fixing hole is provided on the base 1. The fixing hole communicates with the clamping groove. A fixing bolt 207 is screwed in the fixing hole and abuts against the clamping plate, so that the lifting tube 205 is fixed to the base 1. The lifting rod 206 is inserted into the lifting tube 205. A first limiting hole is provided on the side wall of the lifting tube 205. A first limiting bolt 208 is screwed in the first limiting hole. The first limiting bolt 208 abuts against the lifting rod 206 to fix the lifting rod 206 relative to the lifting tube 205. The telescopic sleeve 203 is arranged on the top of the lifting rod 206. The arrangements of the clamping groove and the clamping plate prevent the lifting tube 205 from detaching from the base 1. At the same time, the rotatable arrangement of the lifting tube 205 enables fine adjustment of the descending position of the probe 5 when the probe 5 descends, facilitating the probe 5 to extend into the karst cave. The setting of the first limiting bolt 208 facilitates the relative fixation of the lifting tube 205 and the lifting rod 206.

[0044] AsFigure 2 and Figure 4 As shown in Figure 4 , the telescopic sleeve 203 includes a telescopic tube 209, a telescopic rod 210, and a telescopic driving assembly 211. The telescopic tube 209 is fixedly arranged at the top of the lifting rod 206. The telescopic rod 210 is inserted into the telescopic tube 209. The telescopic driving assembly 211 is connected to the telescopic rod 210 and is used to drive the telescopic rod 210 to extend or retract into the telescopic tube 209. The fixed pulley 201 is arranged on the telescopic rod 210, and the meter 4 is arranged on the telescopic tube 209. The arrangement of the telescopic driving assembly 211 facilitates driving the telescopic rod 210 to expand and contract.

[0045] Specifically, the telescopic driving assembly 211 includes a spring 212, a driving cable 213, a cable take-up wheel 214, two third mounting plates 215, and a second limit bolt 216. The spring 212 is arranged inside the telescopic tube 209. One end of the spring 212 is connected to the telescopic tube 209, and the other end is connected to the telescopic rod 210. When the spring 212 is in a natural state, the part of the telescopic rod 210 extending out of the telescopic tube 209 reaches the maximum length. The third mounting plates 215 are arranged on the base 1 at intervals. The cable take-up wheel 214 is rotatably arranged between the third mounting plates 215. One end of the driving cable 213 is connected to the cable take-up wheel 214, and the other end is connected to the telescopic rod 210. The third mounting plate 215 is provided with a second limit hole, and the second limit bolt 216 is screwed into the second limit hole. During use, only need to rotate the cable take-up wheel 214 to wind the cable 202 around the cable take-up wheel 214, then the telescopic rod 210 can be pulled to contract into the telescopic tube 209, and at this time the spring 212 is compressed and stores energy. When the telescopic rod 210 needs to extend, rotate the cable take-up wheel 214 to unwind the driving cable 213. At this time, the spring 212 releases energy and pushes the telescopic rod 210 to extend. When the probe 5 rises or falls, a thrust towards the inside of the telescopic tube 209 will be given to the telescopic rod 210. Due to the existence of the spring 212, the telescopic rod 210 will not move.

[0046] In this embodiment, the base 1 includes a bottom plate 103 and support legs 104 arranged at the four corners of the bottom plate 103. The length of the support legs 104 is adjustable. The support legs 104 with adjustable length can make the bottom plate 103 placed more stably.

[0047] Finally, a threaded hole is provided at each of the four corners of the bottom plate 103. The support legs 104 are threaded rods, and the threaded rods are screwed into the threaded holes. The arrangement of the threaded rods has a simple structure and is convenient to use.

[0048] The above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An automatic detection device for karst caves at the pile bottom, characterized in that, Comprising: A base (1) with a wire winding roller (101) rotatably provided at the top; A bracket provided on the base (1), with a fixed pulley (201) provided on the bracket. One end of a cable (202) is fixed to the wire winding roller (101), and one end of the cable (202) is electrically fused with a probe (5) after passing through the fixed pulley (201); A driving mechanism (3) provided on the base (1), with the power output end of the driving mechanism (3) connected to the wire winding roller (101); A meter (4) provided on the bracket, with the cable (202) passing through the meter (4).

2. The automatic pile bottom karst cave detection device according to claim 1, characterized in that: Two first mounting plates (102) are fixed on the base (1), the first mounting plates (102) are arranged at intervals, and the wire winding roller (101) is rotatably provided between the two first mounting plates (102); The driving mechanism (3) includes a motor (301), a speed reduction assembly (302) and a driven rod (303). The driven rod (303) is connected to the wire winding roller (101), and the driven rod (303) extends to one side of one of the mounting plates; the power output end of the motor (301) is connected to the speed reduction assembly (302), the speed reduction assembly (302) is connected to the driven rod (303), and the motor (301) can drive the driven rod (303) to rotate.

3. The automatic pile bottom karst cave detection device according to claim 2, characterized in that: The speed reduction assembly (302) includes a driving wheel (304), a driven wheel (305), a driving rod (307), two second mounting plates (306) and a transmission belt (308). The driving wheel (304) is provided at the power output end of the motor (301), the two second mounting plates (306) are arranged at intervals on the top of the base (1), the driven wheel (305) is rotatably provided between the two second mounting plates (306), the driving wheel (304) meshes with the driven wheel (305), the driving rod (307) is connected to the driven wheel (305), and the driving rod (307) is coaxially arranged with the driven wheel (305). The driving rod (307) extends to one side of one of the second mounting plates (306), and the transmission belt (308) is sleeved on the driving rod (307) and the driven rod (303). The diameter of the driving wheel (304) is smaller than the diameter of the driven wheel (305).

4. The automatic pile bottom karst cave detection device according to claim 3, characterized in that: The bracket includes a lifting sleeve (204) and a telescopic sleeve (203). The lifting sleeve (204) is vertically arranged at the top of the base (1), and the telescopic sleeve (203) is horizontally arranged at the top of the lifting sleeve (204). The lifting sleeve (204) is used to drive the telescopic sleeve (203) to rise or fall. The fixed pulley (201) is arranged on the telescopic sleeve (203), and the telescopic sleeve (203) is used to drive the probe (5) to approach or move away from the base (1).

5. The automatic bottom-hole karst detection device according to claim 4, characterized in that: The lifting sleeve (204) includes a lifting pipe (205) and a lifting rod (206). A pivot hole is provided at the top of the base (1), and an annular slot is provided on the hole wall of the pivot hole. An annular clamping plate is provided at the bottom of the lifting pipe (205). The lifting pipe (205) is rotatably arranged in the pivot hole, and the clamping plate is inserted into the slot. A fixing hole is provided on the base (1), and the fixing hole communicates with the slot. A fixing bolt (207) is screwed in the fixing hole and abuts against the clamping plate, so that the lifting pipe (205) is fixed to the base (1); The lifting rod (206) is inserted into the lifting pipe (205). A first limiting hole is provided on the side wall of the lifting pipe (205), and a first limiting bolt (208) is screwed in the first limiting hole. The first limiting bolt (208) abuts against the lifting rod (206) to fix the lifting rod (206) relative to the lifting pipe (205); The telescopic sleeve (203) is arranged at the top of the lifting rod (206).

6. The automatic bottom-hole karst detection device according to claim 5, characterized in that: The telescopic sleeve (203) includes a telescopic pipe (209), a telescopic rod (210) and a telescopic driving component (211). The telescopic pipe (209) is fixedly arranged at the top of the lifting rod (206). The telescopic rod (210) is inserted into the telescopic pipe (209). The telescopic driving component (211) is connected to the telescopic rod (210), and the telescopic driving component (211) is used to drive the telescopic rod (210) to extend or retract into the telescopic pipe (209); The fixed pulley (201) is arranged on the telescopic rod (210), and the meter counter (4) is arranged on the telescopic pipe (209).

7. The automatic bottom-hole karst detection device according to claim 6, characterized in that: The telescopic drive assembly (211) includes a spring (212), a drive cable (213), a cable reel (214), two third mounting plates (215), and a second limit bolt (216). The spring (212) is disposed inside the telescopic tube (209). One end of the spring (212) is connected to the telescopic tube (209), and the other end of the spring (212) is connected to the telescopic rod (210). When the spring (212) is in its natural state, the portion of the telescopic rod (210) extending outside the telescopic tube (209) reaches its maximum length. The third mounting plates (215) are spaced apart and disposed on the base (1). The cable reel (214) is rotatably disposed between the third mounting plates (215). One end of the drive cable (213) is connected to the cable reel (214), and the other end of the drive cable is connected to the telescopic rod (210). Second limit holes are provided on the third mounting plates (215), and the second limit bolt (216) is screwed into the second limit holes.

8. The automatic bottom-hole karst detection device according to claim 7, wherein: The base (1) includes a bottom plate (103) and support legs (104) provided at the four corners of the bottom plate (103), and the lengths of the support legs (104) are adjustable.

9. The automatic bottom-hole karst detection device according to claim 8, wherein: Threaded holes are provided at the four corners of the bottom plate (103), and the support legs (104) are threaded rods that are screwed into the threaded holes.

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