Cross-hole resistivity CT auxiliary driving device with mud penetrating function

Abstract

The utility model relates to engineering geophysical prospecting electrical prospecting technical field, and specifically is a kind of hole-crossing resistivity CT auxiliary driving device with mud lead function, including exploration device, counterweight device and lead driving device, the inside top end of exploration device is equipped with detection electrode, signal transmission and power supply integrated cable are connected to detection electrode, exploration device is equipped with connecting lock catch one, the bottom end of exploration device is slidingly connected with sealing cap one on the outer periphery of connecting lock catch one, and the bottom end of exploration device is equipped with motor power cable A end head;Counterweight device is composed of connecting lock catch two, bolt one, counterweight hammer main body, bolt two and sealing cap two, the top end of counterweight hammer main body is equipped with connecting lock catch two, bolt two is connected in the hole of connecting lock catch two surface, bolt one is set up in the top end surface of counterweight hammer main body, and the bottom end of counterweight hammer main body is integrally structured with sealing cap two.This device is simple to operate, can replace drilling machine secondary hole washing, while not excessive waste water resources.

Description

Technical Field

[0001] This utility model relates to the field of engineering geophysical and electrical exploration technology, specifically to a cross-hole resistivity CT auxiliary drive device with mud penetration function. Background Technology

[0002] Many cities in my country have well-developed underground karst formations. When tunnel boring machines (TBMs) are used in urban rail transit construction, it is necessary to comprehensively investigate the karst development within the safe range of the TBM construction. Among these methods, borehole surveying is the most practical, intuitive, and accurate method for detecting karst caves. However, borehole surveying can only reveal the karst development within the depth range of the borehole. Even with increased borehole density, blind spots still exist, especially in areas where dense borehole deployment is not feasible. This significantly increases construction risks. Therefore, engineering geophysical exploration has become the preferred method for investigating concealed karst. In areas where subway lines pass under or alongside buildings, cross-hole resistivity CT is a geophysical exploration method with strong anti-interference capabilities and convenient construction.

[0003] A pair of trans-hole resistivity CTs requires drilling two probe holes at corresponding depths. However, in karst areas, especially those overlying with thick sand layers, a certain thickness of mud and sand accumulates at the bottom of the hole during drilling, preventing the probe equipment from reaching the designed depth. Therefore, during trans-hole resistivity field testing, a PVC pipe is typically placed in the hole. To ensure the excitation current can penetrate the formation between the holes, small holes are evenly distributed within the PVC pipe. Additionally, to prevent mud from entering the PVC pipe, a layer of fine mesh is wrapped around the outside of the borehole. However, during field testing, under high pressure and high flow rate mud impact, the PVC pipe may be deformed, causing mud to enter the casing. In such cases, high-pressure water hoses are typically used to flush the hole. While this method is effective to some extent, it is time-consuming, labor-intensive, and wastes a significant amount of water resources.

[0004] According to relevant data, there is currently no auxiliary device for implementing trans-hole resistivity for autonomous drilling of mud inside the guide hole. Utility Model Content

[0005] To address the problems in the existing technology, this utility model provides a trans-hole resistivity CT auxiliary drive device with mud-conducting function.

[0006] The technical solution adopted by this utility model to solve its technical problem is a trans-pore resistivity CT auxiliary drive device with mud penetration function, including an exploration device, a counterweight device and a penetration drive device. The top of the exploration device is equipped with a detection electrode. The electrical output end of the detection electrode is electrically connected to a signal transmission and power supply cable. The bottom end of the exploration device has an integrated connection latch. The bottom end of the exploration device is slidably connected to the outer periphery of the connection latch. The bottom end of the exploration device is provided with a motor power supply cable A end. The counterweight device consists of a second connecting latch, a first bolt, a counterweight body, a second bolt, and a second sealing cap. The second connecting latch is integrally formed at the center of the top surface of the counterweight body. The second bolt is screwed into the hole on the surface of the second connecting latch. The first bolt is formed on the top surface of the counterweight body. The second sealing cap is integrally formed at the bottom end of the counterweight body.

[0007] By adopting the above technical solution, the connection lock 1 in the detection device, the connection lock 2 in the counterweight device, and the stud are fastened together. At the same time, the A and B ends of the power supply cables of the two end electrodes are connected through the reserved holes of the two devices. Silicone is applied to the inside of the sealing cap 1 and the sealing cap is tightened onto the stud 2. After the detection electrode and the integrated signal transmission and power supply cable of the detection inherent structure reach the designated position, the cable is straightened and the detection work is carried out. The entire counterweight device 7 is hollow in the middle (power supply diameter 5mm) to allow the B end of the motor power supply cable to pass through and connect to the A end of the motor power supply cable in the detection device. The main body of the counterweight hammer is made of high-strength, corrosion-resistant stainless steel, weighs 10kg, has a diameter of 50mm, and a length of 50cm. The inner side of the sealing cap has a nut and stud in triple matching.

[0008] Specifically, the drive device consists of a motor power supply cable B end, three bolts, a drilling motor fixing rod, a motor housing, a drilling motor, and a high-strength threaded drill bit. The drilling motor is installed inside the motor housing and is fixed to the inner wall of the motor housing by the drilling motor fixing rod. The electrical input terminal of the drilling motor is electrically connected to the motor power supply cable B end. The top of the motor housing has an integral three bolts. The high-strength threaded drill bit is assembled at the power output terminal of the drilling motor at the bottom of the motor housing.

[0009] By adopting the above technical solution, the tail of the drilling motor is welded to a 20mm diameter, 10cm long drilling motor fixing rod through a welding process, ensuring that the drilling motor does not shake during rotation. The motor housing is a 10mm thick, sealed stainless steel inverted trapezoidal square platform with a maximum diameter of 70mm. This serves two purposes: firstly, to protect the drilling motor from collisions and corrosion, and secondly, to reduce drilling resistance. The drilling motor is a custom-made 220V permanent magnet DC high-speed small drilling motor with a diameter of 60mm, a length of 200mm, and a power of 600w. It has forward and reverse rotation functions. The connecting rod of the drilling motor is 20mm long, and the other end of the connecting rod is a high-strength threaded drill bit. The high-strength threaded drill bit has a maximum outer diameter of 65mm, a height of 100mm, and is made of steel and brass. The top of the drill bit is made of diamond.

[0010] Specifically, the first connecting latch and the second connecting latch are engaged, and the exploration device is connected to the counterweight device through the screw connection structure of the first connecting latch, the second connecting latch and the second bolt. The first sealing cap is engaged with the first bolt, and the first connecting latch, the second connecting latch and the second bolt are screwed together to form a seal through the screw connection of the first sealing cap and the first bolt.

[0011] By adopting the above technical solution, the connection is secured by the first connecting latch in the detection device, the second connecting latch in the counterweight device, and the stud. Finally, the sealing cap is screwed into the surface of the bolt to achieve the effect of sealing the connection.

[0012] Specifically, the end of the motor power supply cable B, away from the drilling motor, is inserted into the central reserved hole of the counterweight device. Reserved holes are opened on the surfaces of the first and second connecting latches, and the ends of the motor power supply cable A and the end of the motor power supply cable B are electrically connected through the reserved holes of the first and second connecting latches.

[0013] By adopting the above technical solution, the A and B ends of the power supply cable for the two end electrodes are connected, silicone is applied to the inside of the sealing cap, and the sealing cap is tightened onto the stud for power supply to the drilling motor.

[0014] Specifically, the bottom end of the counterweight body is connected to the bolts in three phases by a sealing cap.

[0015] By adopting the above technical solution, after applying silicone to the inner side of the sealing cap two, it is tightened onto the stud three to seal the connection between the counterweight device and the guide drive device.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. A counterweight is connected below the detection electrode cable of this device. Under the action of gravity of the counterweight, the cable can be kept straight and the spacing between the measuring electrodes can be consistent. 2. This device is equipped with an autonomous drilling drive device below the counterweight device. This device is equipped with a high-strength threaded drill bit, which can easily break the surface tension of the mud during the drilling motor's drilling process, and smoothly guide the mud under the gravity of the counterweight device. 3. The drilling motor of this device is an adjustable forward and reverse drilling motor. After the detection is completed, the cable can be easily retrieved by reversing the switch. 4. This device is easy to operate, can replace secondary hole washing of drilling rigs, and does not waste water resources excessively. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1This is an overall structural diagram of the resistivity CT mud penetration auxiliary device of this utility model; Figure 2 This is a schematic diagram of the detection device of this utility model; Figure 3 This is a schematic diagram of the counterweight device structure of this utility model; Figure 4 This is a schematic diagram of the structure of the guide drive device of this utility model; In the diagram: 1. Exploration device; 2. Detector electrode; 3. Integrated signal transmission and power supply cable; 4. Sealing cap one; 5. Connecting latch one; 6. Motor power supply cable A end; 7. Counterweight device; 8. Connecting latch two; 9. Bolt one; 10. Counterweight hammer body; 11. Bolt two; 12. Sealing cap two; 13. Guide drive device; 14. Motor power supply cable B end; 15. Bolt three; 16. Drilling motor fixing rod; 17. Motor box; 18. Drilling motor; 19. High-strength threaded drill bit. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Please see Figures 1-4 This utility model provides a technical solution: a trans-pore resistivity CT auxiliary drive device with mud penetration function, including an exploration device 1, a counterweight device 7 and a penetration drive device 13. The top of the exploration device 1 is equipped with a detection electrode 2. The electrical output end of the detection electrode 2 is electrically connected to a signal transmission and power supply cable 3. The bottom end of the exploration device 1 has an integrated connection latch 5. The bottom end of the exploration device 1 is slidably connected to the outer periphery of the connection latch 5 and a sealing cap 4. The bottom end of the exploration device 1 is provided with a motor power supply cable A end 6. The counterweight device 7 consists of a second connecting latch 8, a first bolt 9, a counterweight body 10, a second bolt 11, and a second sealing cap 12. The second connecting latch 8 is integrally formed at the center of the top surface of the counterweight body 10. The second bolt 11 is screwed into the hole opened on the surface of the second connecting latch 8. The first bolt 9 is opened on the top surface of the counterweight body 10. The second sealing cap 12 is integrally formed at the bottom end of the counterweight body 10.

[0021] In use, the connection is secured by the connecting latch 5 in the detection device, the connecting latch 8 in the counterweight device 7, and the stud. At the same time, the power supply cables A and B of the two end electrodes are connected through the reserved holes of the two devices. Silicone is applied to the inside of the sealing cap 4 and the sealing cap is tightened onto the stud. After the detection electrode 2 of the detection inherent structure and the integrated signal transmission and power supply cable 3 reach the designated position, the cable is straightened and the detection work is carried out. The entire counterweight device 77 is hollow in the middle (power supply diameter 5mm) to allow the motor power supply cable B end 14 to pass through and connect to the motor power supply cable A end 6 in the detection device. The counterweight hammer body 10 is made of high-strength corrosion-resistant stainless steel, weighs 10kg, has a diameter of 50mm, and a length of 50cm. The inner side of the sealing cap has a nut and stud in triple matching.

[0022] like Figure 1 and Figure 4 As shown, the drive device 13 consists of a motor power supply cable B end 14, bolt 3 15, drilling motor 18 fixing rod 16, motor housing 17, drilling motor 18, and high-strength threaded drill bit 19. The drilling motor 18 is installed inside the motor housing 17, and the drilling motor 18 is fixed to the inner wall of the motor housing 17 by the drilling motor 18 fixing rod 16. The electrical input terminal of the drilling motor 18 is electrically connected to the motor power supply cable B end 14. Bolt 3 15 is integrally constructed at the top of the motor housing 17. The high-strength threaded drill bit 19 is assembled at the power output terminal of the drilling motor 18 passing through the bottom of the motor housing 17.

[0023] During use, the tail of the drilling motor 18 is welded to the fixing rod 16 of the drilling motor 18, which has a diameter of 20mm and a length of 10cm, through a welding process. This prevents the drilling motor 18 from shaking during rotation. The motor housing 17 is a 10mm thick, sealed stainless steel inverted trapezoidal square platform with a maximum diameter of 70mm. This serves two purposes: firstly, to protect the drilling motor 18 from collisions and corrosion, and secondly, to reduce drilling resistance. The drilling motor 18 is a custom-made drilling motor with a diameter of 60mm and a length of 200mm. It is a 220V permanent magnet DC high-speed small drilling motor with a power of 600w and forward and reverse rotation functions. The connecting rod of the drilling motor 18 is 20mm long, and the other end of the connecting rod is a high-strength threaded drill bit 19. The high-strength threaded drill bit 19 has a maximum outer diameter of 65mm, a height of 100mm, and is made of steel and brass. The top of the drill bit is made of diamond.

[0024] like Figure 1 , Figure 2 and Figure 3As shown, the first connecting latch 5 and the second connecting latch 8 are engaged, and the exploration device 1 is connected to the counterweight device 7 through the screw connection structure of the first connecting latch 5, the second connecting latch 8 and the second bolt 11. The first sealing cap 4 is engaged with the first bolt 9, and after the first connecting latch 5, the second connecting latch 8 and the second bolt 11 are screwed together, the sealing cap 4 and the first bolt 9 are screwed together to form a seal.

[0025] In use, the connection is secured by the connecting latch 5 in the detection device, the connecting latch 8 in the counterweight device 7, and the stud. Finally, the sealing cap 4 is screwed into the surface of the bolt 9 to achieve a sealed connection.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the end of the motor power supply cable B 14 away from the drilling motor 18 is disposed in the center reserved hole of the counterweight device 7. The surfaces of the connecting latch 1 5 and the connecting latch 2 8 are both provided with reserved holes, and the ends of the motor power supply cable A 6 and the motor power supply cable B 14 are electrically connected through the reserved holes of the connecting latch 1 5 and the connecting latch 2 8.

[0027] When in use, connect the A and B ends of the power supply cable to the two electrodes, apply silicone to the inside of the sealing cap 4, and tighten the sealing cap onto the stud 2 to supply power to the drilling motor 18.

[0028] like Figure 1 , Figure 2 and Figure 3 Figure 1 Figure 2 Figure 3 As shown, the bottom end of the counterweight body 10 is connected to the bolt 15 by a sealing cap 2 12.

[0029] When in use, apply silicone to the inside of the sealing cap 12 and tighten it onto the stud 3 to seal the connection between the counterweight device and the guide drive device 13.

[0030] The working principle and usage process of this utility model are as follows: The connecting latch 5 in the detection device 1, the connecting latch 8 in the counterweight device 7, and the stud are used for fastening. Simultaneously, the power supply cables A and B of the two end electrodes are connected through the pre-drilled holes in both devices. Silicone is applied to the inside of the sealing cap 4, and the sealing cap is tightened onto the stud. The motor power supply cable B end 14 is passed through the pre-drilled hollow hole in the counterweight device 7 and connected to the power supply cable B end of the drilling motor 18. Afterwards, silicone is applied to the inside of the sealing cap 12 of the counterweight device 7 and tightened onto the stud. After connection, the entire device is slowly lowered into the hole until it can no longer be lowered under its own weight. Then, the forward rotation button of the drilling motor 18 is turned on. Under the rotation of the high-strength threaded drill bit 19 and the gravity of the counterweight device 7, the surface tension of the mud is successfully broken. Simultaneously, water is injected into the borehole to dilute the slurry to a certain extent and reduce drilling resistance. Once the probe electrode 2 reaches the designated position, straighten the cable and begin the detection work. After the on-site detection work is completed, turn on the reverse button of the drilling motor 18 and pull the cable simultaneously. Under the action of external pulling force and the reverse drilling thrust of the motor, slowly retract the probe cable. After turning off the power supply, clean the device with clean water.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A trans-hole resistivity CT auxiliary drive device with mud-conducting function, characterized in that, The device includes an exploration device (1), a counterweight device (7), and a guide drive device (13). The top of the exploration device (1) is equipped with a detection electrode (2). The electrical output end of the detection electrode (2) is electrically connected to a signal transmission and power supply cable (3). The bottom end of the exploration device (1) has an integrated connection latch (5). The bottom end of the exploration device (1) is slidably connected to the outer periphery of the connection latch (5) with a sealing cap (4). The bottom end of the exploration device (1) is provided with a motor power supply cable A end (6). The counterweight device (7) consists of a connecting latch two (8), a bolt one (9), a counterweight body (10), a bolt two (11), and a sealing cap two (12). The connecting latch two (8) is integrally constructed at the center of the top surface of the counterweight body (10). The bolt two (11) is screwed into the hole opened on the surface of the connecting latch two (8). The bolt one (9) is opened on the top surface of the counterweight body (10). The sealing cap two (12) is integrally constructed at the bottom end of the counterweight body (10).

2. The trans-hole resistivity CT auxiliary drive device with mud-conducting function according to claim 1, characterized in that, The drive device (13) consists of a motor power supply cable B end (14), bolt three (15), drilling motor fixing rod (16), motor box (17), drilling motor (18) and high-strength threaded drill bit (19). The drilling motor (18) is installed inside the motor box (17), and the drilling motor (18) is fixed to the inner wall of the motor box (17) by the drilling motor fixing rod (16). The electrical input end of the drilling motor (18) is electrically connected to the motor power supply cable B end (14). Bolt three (15) is integrally constructed on the top of the motor box (17). The high-strength threaded drill bit (19) is assembled at the power output end of the bottom of the motor box (17) through which the drilling motor (18) passes.

3. The trans-hole resistivity CT auxiliary drive device with mud-conducting function according to claim 1, characterized in that, The first connecting latch (5) is engaged with the second connecting latch (8), and the exploration device (1) is connected to the counterweight device (7) through the screw connection structure of the first connecting latch (5), the second connecting latch (8) and the second bolt (11). The first sealing cap (4) is engaged with the first bolt (9), and the first connecting latch (5), the second connecting latch (8) and the second bolt (11) are screwed together and then sealed by the screw connection of the first sealing cap (4) and the first bolt (9).

4. The trans-hole resistivity CT auxiliary drive device with mud-conducting function according to claim 2, characterized in that, The end of the motor power supply cable B (14) away from the drilling motor (18) is installed in the center reserved hole of the counterweight device (7). The surfaces of the first connecting latch (5) and the second connecting latch (8) are both provided with reserved holes, and the ends of the motor power supply cable A (6) and the motor power supply cable B (14) are electrically connected through the reserved holes of the first connecting latch (5) and the second connecting latch (8).

5. The trans-hole resistivity CT auxiliary drive device with mud-conducting function according to claim 1, characterized in that, The bottom end of the counterweight body (10) is connected to the bolt (15) by a sealing cap (12).

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