Device for monitoring grouting process of pile foundation and foundation

Abstract

The utility model discloses a device for monitoring the grouting process of a pile foundation and a foundation. The device comprises a base, a rotating table, a telescopic rod, a supporting frame, a high-density resistivity meter, a slurry conveying pipe, a spiral drill rod, a sliding bearing, an electrode plate, a cable, a counterweight device and a motor. The base is fixedly arranged on a to-be-monitored pile foundation, and the rotating table is arranged above the base; one side of the rotating table is fixedly connected with the tail end of the telescopic rod, and the other side is connected with a counterweight device; a third motor is arranged on one side of the sliding bearing, a spiral drill rod is arranged at the bottom of the third motor, and a slurry conveying pipe penetrates through the interior of the spiral drill rod; the high-density resistivity meter is arranged on the counterweight device; one end of the electrode plate is placed on the ground, and the other end is connected with one end of the cable; and the high-density resistivity meter is connected with the other end of the cable. According to the utility model, the post-grouting process of the pile foundation can be monitored in real time, the strength of the pile foundation and the soil body after grouting can be evaluated, the weak strength or defect position of the foundation can be subjected to grouting reinforcement treatment, and the grouting process can be monitored in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation and ground foundation monitoring and strengthening treatment, in particular to a device for monitoring the grouting process of pile foundation and ground foundation. Background Art

[0002] Soft soil is a common adverse geological condition. Its high water content, high compressibility, low bearing capacity, and low permeability can easily lead to building settlement, tilt, and even damage. To ensure building stability and safety, strengthening pile and foundation foundations in soft soil areas is crucial. Grouting, as a cost-effective method, is widely used to strengthen pile and foundation foundations in soft soil areas.

[0003] Grouting methods include post-grouting and foundation grouting. The post-grouting method involves injecting slurry into the soil layer at the pile end and the soil on the sides of the pile using a high-pressure grouting pump or other device through a grouting pipe pre-buried in the pile foundation after the pile is cast-in-place and the pile body concrete has reached a certain strength. The slurry penetrates into the soil layer to fill, consolidate, or compact the sediment at the bottom of the pile and the bearing layer at the pile end, changing the local shape of the pile foundation and increasing the bearing area of ​​the pile. In addition, the injected slurry changes the mechanical and physical properties of the original soil, increasing the strength of the soil near the pile end and the sides, thereby enhancing the bearing capacity and pull-out resistance of the pile foundation. The foundation grouting method is a strengthening treatment for the foundation soil layer. By injecting slurry of a certain pressure and concentration into the foundation, the voids and cracks in the soil layer are filled, the physical and mechanical properties of the soil are improved, and the bearing capacity and stability of the foundation are increased.

[0004] Pile and foundation grouting is an important means of strengthening soft soil areas, and its effect detection is a key link in ensuring the safety of project quality. However, since pile and foundation grouting is a concealed project and the geological conditions are changeable and complex, it is very difficult to evaluate the specific grouting effect. Current detection methods include drilling sampling method and analytical speculation method. The drilling sampling method is suitable for evaluating the grouting effect after the grouting is completed, while the analytical speculation method indirectly calculates the grouting effect through parameters such as grouting volume and grouting pressure. It cannot actually determine the situation of the slurry in the underground space, and it is impossible to directly observe the actual diffusion path of the grouting slurry and accurately evaluate the grouting effect. Therefore, it is necessary to develop a new device and method to monitor the grouting process of pile and foundation in real time, observe the flow path of the grouting slurry, and accurately evaluate the grouting effect. Utility Model Content

[0005] The purpose of this utility model is to provide a device for monitoring the grouting process of pile foundations and subgrades. By measuring the underground resistivity in real time, real-time monitoring of the entire grouting process is achieved. According to the resistivity map, the grouting amount and grouting pressure are controlled to achieve the ideal grouting effect. In addition, grouting can be performed on low-strength areas to improve the bearing capacity of pile foundations and subgrades.

[0006] The utility model adopts the following technical solutions:

[0007] A device for monitoring a pile foundation and a foundation grouting process, comprising:

[0008] Base, rotating table, telescopic rod, support frame, high-density resistivity meter, pressure relief valve, slurry pipe, auger rod, sliding bearing, limit ring, electrode sheet, cable, counterweight device and motor.

[0009] The base is fixed on the pile foundation to be monitored; a rotating platform is arranged above the base, and a first motor is arranged above the rotating platform. One side of the rotating platform is fixedly connected to the end of the telescopic rod, and the other side of the rotating platform is connected to the counterweight device; the front end of the telescopic rod is connected to the support frame, and a sliding bearing is arranged between the first vertical rod and the second vertical rod in the support frame, and a limit ring is arranged below the support frame; a third motor is arranged on the side of the sliding bearing away from the support frame, and an auger rod is arranged at the bottom of the third motor, and a slurry pipe passes through the inside of the auger rod; a fourth motor is arranged above the sliding bearing, and is used to drive the sliding bearing to slide up and down; a high-density resistivity meter is arranged on the counterweight device, and is used to draw a three-dimensional resistivity image; the upper side of the pressure relief valve is connected to the slurry pipe, and the lower side is connected to the pile side grouting pipe and the pile end grouting pipe.

[0010] The electrode sheet and cable constitute an electrode system. One end of the electrode sheet is placed on the ground, and the other end is connected to one end of the cable. The high-density resistivity meter is connected to the other end of the cable and then to the electrode system to control the power supply and measurement status of the electrode system.

[0011] Furthermore, the base is connected to the rotating platform through a sliding groove.

[0012] Furthermore, the interior of the telescopic rod includes a second motor, a hydraulic cylinder, a first gear, a second gear, a screw rod, a limit block, a sleeve, a push rod and a fixing clamp.

[0013] The second motor, hydraulic cylinder and first gear are located on the upper side of the telescopic rod, the second motor and hydraulic cylinder are on the same horizontal line, the second gear is located below the first gear and meshes with the transmission; one end of the spiral rod is connected to the second gear, and the other end is connected to the limit block; the limit block is set at one end of the push rod; the fixing clamp is fixedly connected to the other end of the push rod for connecting and fixing the support frame; the sleeve is set on the outside of the push rod.

[0014] Furthermore, the auger rod passes through the limiting ring; the interior of the auger rod is hollow, and the slurry delivery pipe passes through the hollow area of ​​the auger rod; and grouting channels and grouting holes are reserved above the drill bit and the drill body of the auger rod.

[0015] Furthermore, the support frame includes a support rod, a first vertical rod, a second vertical rod, an upper cross rod, a lower cross rod, an upper connecting rod and a lower connecting rod; the support rod is fixedly connected to the first vertical rod and the second vertical rod through two upper cross rods and a lower cross rod, and the first vertical rod and the second vertical rod are fixedly connected through an upper connecting rod and a lower connecting rod, and a limiting ring is provided under the support rod.

[0016] Sliding pads are provided at the bottom of the support rod, the first vertical rod and the second vertical rod.

[0017] Furthermore, the counterweight device includes a counterweight block, a straight rod, an inclined rod, a top plate and a bottom plate.

[0018] One end of the bottom plate is connected to the rotating table, and the top plate and the bottom plate are fixedly connected by an inclined rod and two straight rods. The bottom of the inclined rod is fixedly connected to the bottom of the straight rod. The high-density resistivity meter is placed in the groove in the middle of the bottom plate; the counterweight block is placed at the other end of the bottom plate to increase its own weight.

[0019] Compared with the prior art, the above technical solution adopted by the present invention has the following technical effects:

[0020] (1) The device proposed in the utility model can measure the resistivity distribution of the stratum by inserting the electrode sheets on the surface and connecting them together through cables and connecting them to a high-density resistivity meter, thereby obtaining a three-dimensional resistivity image and specific values, and realizing real-time monitoring and visual display of the grouting effect.

[0021] (2) The device proposed in the present invention places the base sleeve on the pile foundation, adjusts the direction of the telescopic rod by rotating the turntable, and then starts the second motor in the telescopic rod. The hydraulic cylinder drives the first gear and the second gear to rotate, thereby rotating the spiral rod and driving the top rod fixedly connected to it to move, thereby adjusting the length of the telescopic rod and realizing the operation of grouting operations of the spiral drill rod at different positions.

[0022] (3) The device proposed by the present invention installs a fourth motor above the sliding bearing, which is laterally connected to the third motor. Starting the fourth motor can move the sliding bearing up and down along the support frame. Starting the third motor, the spiral drill rod starts drilling. The drill bit drills into the stratum and continues to penetrate deeper into the target grouting area. The slurry is injected through the hollow pipe in the spiral drill rod, which can realize grouting reinforcement treatment of the pile side, pile bottom and foundation, thereby improving the bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of the overall structure of the utility model.

[0024] Figure 2 It is a top view of the overall structure of the utility model.

[0025] Figure 3 It is a left view of the overall structure of the utility model.

[0026] Figure 4 It is a right view of the overall structure of the utility model.

[0027] Figure 5 It is a longitudinal sectional view of the pile foundation of the present utility model.

[0028] Figure 6 It is a longitudinal sectional view of the telescopic tube of the present utility model.

[0029] Figure 7 It is an application scenario diagram of an embodiment of the present utility model.

[0030] Reference numerals: 1-base, 2-rotating table, 21-first motor, 3-telescopic rod, 31-second motor, 32-hydraulic cylinder, 33-first gear, 34-second gear, 35-screw rod, 36-limiting block, 37-sleeve, 38-top rod, 39-fixing clamp, 41-auger rod, 42-third motor, 43-fourth motor, 44-sliding bearing, 45-limiting ring, 5-support frame, 51-support rod, 52-first vertical rod, 53-second vertical rod, 54 -Upper crossbar, 55-lower crossbar, 56-upper connecting rod, 57-lower connecting rod, 58-sliding pad, 61-counterweight, 62-straight rod, 63-inclined rod, 64-top plate, 65-bottom plate, 7-high-density resistivity meter, 71-electrode sheet, 72-cable, 8-pile foundation, 9-grouting body, 10-slurry, 11-pressure relief valve, 12-slurry delivery pipe, 13-grouting pump, 14-slurry suction pipe, 15-slurry storage tank, 16-foundation, 17-pile side grouting pipe, 18-pile end grouting pipe. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0032] To achieve the above purpose, the present invention proposes a device for monitoring the grouting process of pile foundation and foundation, such as Figure 1 、 2 Shown, including:

[0033] Base 1, rotating table 2, telescopic rod 3, support frame 5, high-density resistivity meter 7, pressure relief valve 11, slurry delivery pipe 12, auger rod 41, sliding bearing 44, limit ring 45, electrode sheet 71, cable 72, counterweight device and motor.

[0034] The base 1 is fixedly set on the pile foundation 8 to be monitored and is used to support the upper structure; a rotating platform 2 is set above the base 1 and is connected by a slide; a first motor 21 is set above the rotating platform 2, and starting the first motor 21 can make the rotating platform 2 rotate around the base 1; one side of the rotating platform 2 is fixedly connected to the end of the telescopic rod 3, and the other side of the rotating platform 2 is connected to the counterweight device; the front end of the telescopic rod 3 is connected to the support frame 5, and a sliding bearing 44 is set between the first vertical rod 52 and the second vertical rod 53 in the support frame 5, and a A limiting ring 45; a third motor 42 is provided on the side of the sliding bearing 44 away from the support frame 5, and an auger rod 41 is provided at the bottom of the third motor 42. The slurry pipe 12 passes through the interior of the auger rod 41, so that the slurry is injected into the drill hole through the slurry pipe 12; a fourth motor 43 is provided above the sliding bearing 44. Starting the fourth motor 43 can make the sliding bearing 44 slide up and down along the first vertical rod 52 and the second vertical rod 53 of the support frame 5; the high-density resistivity meter 7 is set on the counterweight device for drawing a three-dimensional resistivity image.

[0035] The electrode sheet 71 and the cable 72 constitute an electrode system. One end of the electrode sheet 71 is placed on the ground, and the other end is connected to one end of the cable 72. The high-density resistivity meter 7 is connected to the other end of the cable 72, and then connected to the electrode system, and controls the power supply and measurement status of the electrode system. The electrode sheet 71 receives and stores measurement data to obtain a three-dimensional resistivity image and resistivity value, and monitors in real time to achieve visualization of the grouting effect.

[0036] The auger rod 41 passes through a stop ring 45 to reduce deflection during drilling. The auger rod 41 is hollow, and the grouting pipe 12 passes through the hollow area of ​​the auger rod 41. Grouting channels and grouting holes are reserved above the drill bit and drill body of the auger rod 41. Grouting is delivered to the foundation 16 through the grouting holes, achieving integrated drilling and grouting.

[0037] like Figure 3 、 4 As shown, the support frame 5 includes a support rod 51, a first vertical rod 52, a second vertical rod 53, an upper cross rod 54, a lower cross rod 55, an upper connecting rod 56 and a lower connecting rod 57; the support rod 51 is fixedly connected to the first vertical rod 52 and the second vertical rod 53 by two upper cross rods 54 and a lower cross rod 55, and the first vertical rod 52 and the second vertical rod 53 are fixedly connected by an upper connecting rod 56 and a lower connecting rod 57, and a limiting ring 45 is provided under the support rod 51.

[0038] Sliding pads 58 are provided at the bottom of the support rod 51 , the first vertical rod 52 and the second vertical rod 53 to facilitate the overall movement of the support frame 5 .

[0039] The counterweight device includes a counterweight 61, straight rods 62, inclined rods 63, a top plate 64, and a bottom plate 65. One end of the bottom plate 65 is connected to the rotating table 2. The top plate 64 and bottom plate 65 are fixedly connected by the inclined rods 63 and two straight rods 62. The bottom of the inclined rods 63 is fixedly connected to the bottom of the straight rods 62. The high-density resistivity meter 7 is placed in the groove in the middle of the bottom plate 65. The counterweight 61 is placed at the other end of the bottom plate 65 to increase the deadweight, maintain the center of gravity of the drilling rig, and prevent damage to the telescopic rod caused by excessive lateral bending moment during drilling.

[0040] like Figure 5 As shown, the upper side of the pressure relief valve 11 is connected to the grouting pipe 12 , and the lower side is connected to the pile side grouting pipe 17 and the pile end grouting pipe 18 .

[0041] like Figure 6 As shown, the interior of the telescopic rod 3 includes a second motor 31 , a hydraulic cylinder 32 , a first gear 33 , a second gear 34 , a screw rod 35 , a limit block 36 , a sleeve 37 , a push rod 38 and a fixing clamp 39 .

[0042] The second motor 31, the hydraulic cylinder 32 and the first gear 33 are located on the upper side of the telescopic rod 3, the second motor 31 and the hydraulic cylinder 32 are on the same horizontal line, and the second gear 34 is located below the first gear 33 and meshes with the transmission; one end of the screw rod 35 is connected to the second gear 34, and the other end is connected to the limit block 36; the limit block 36 is provided at one end of the top rod 38 to prevent it from sliding out of the telescopic rod 3; the fixing clamp 39 is fixedly connected to the other end of the top rod 38 for connecting and fixing the support frame 5; the sleeve 37 is provided on the outside of the top rod 38 to play a protective role.

[0043] like Figure 7 As shown, the specific use process of the device proposed by the utility model is as follows:

[0044] Step 1. Before construction, conduct geological surveys on the target bored piles to obtain detailed engineering geological data on the construction site. Select an area with similar soil properties to the bored piles, mark it as a test area, and conduct preliminary experiments. Use a drilling rig to perform drilling and grouting operations in the test area. After drilling and grouting in the designated area, insert the electrode sheet 71 into the surrounding soil, use a high-density resistivity meter 7 to measure the resistivity, and after the slurry solidifies for 28 days, obtain the resistivity image shape and value of the soil layer after grouting. Perform a standard penetration test on the drilling area to determine the bearing capacity of the soil after grouting. According to the actual engineering needs, obtain the resistivity distribution image and resistance value of the expected bearing capacity as the basis for judging the grouting area.

[0045] Step 2: Determine the soil characteristics near the pile foundation based on the previous geological survey to select the location for post-pile grouting. Configure the slurry based on the required increase in bearing capacity, determine the grouting pressure, grouting speed, and grouting volume, and plan the slurry diffusion path and consolidation shape.

[0046] Step 3: After the concrete in the pile reaches the designed grouting strength, the device proposed in the present invention is placed on the pile foundation where post-grouting is required. The electrode sheets 71 are inserted into the soil near the pile at a certain spacing and arrangement order. The high-density resistivity meter 7 receives and stores the measured data through the electrode sheets 71, obtains a three-dimensional resistivity image and resistivity value, and draws a resistivity image of the initial soil layer. During the grouting operation, the slurry is injected into the pile end and the pile side soil through the pile side grouting pipe 17 and the pile end grouting pipe 18 pre-buried inside the steel cage. At the same time, the high-density resistivity meter 7 is activated to draw a resistivity measurement map to observe the resistivity changes near the pile foundation, achieving real-time monitoring of the entire grouting process. The grouting speed and injection volume of the grouting pump are adjusted through the pressure relief valve 11 and other means to control the grouting effect. At the same time, grouting reinforcement is carried out based on the weak bearing capacity and defective areas of the foundation soil layer detected by geological survey data. The entire foundation grouting process is also monitored based on the resistivity measurement map.

[0047] The grouting operation is as follows: the first motor 21 is started to rotate the rotating platform 2 around the base 1. The rotating rotating platform 2 rotates the telescopic rod 3 to the direction of the weak bearing capacity and defective area of ​​the soil layer. Then the second motor 31 is started, and the hydraulic cylinder 32 drives the first gear 33 and the second gear 34 to rotate, causing the screw rod 35 to rotate and drive the top rod 38 to move back and forth, so that the auger rod 41 fixed by the fixing clamp is located above the grouting point. The third motor 42 and the fourth motor 43 are started to start drilling. The auger rod 41 drills into the formation and continues to penetrate deeper into the target grouting area. Then the grouting pump 13 is started. The slurry 10 in the slurry reservoir 15 reaches the grouting pump 13 through the grouting pipe 14 and is pressed into the grouting pipe 12 connected to the hollow area of ​​the auger rod 41 to achieve drilling grouting. The slurry is injected into the weak area through the hollow pipe in the auger rod 41 to strengthen the bearing capacity of the foundation.

[0048] Step 4: After 28 days of post-grouting of the pile foundation, use a high-density resistivity meter 7 to measure and draw a resistivity image of the soil layer. Focus on observing the resistivity size and image shape of the openings of the pile side grouting pipe and the pile end grouting pipe. Compare the resistivity image result with the resistivity image obtained in the test area to determine whether the pile foundation bearing capacity meets the requirements. If not, grouting is strengthened at the post-grouting area of ​​the pile foundation to make the areas interlock, form bite force, increase overall strength, and improve bearing capacity. The specific grouting operation is the same as the foundation grouting method. After 28 days, measure and draw the resistivity image of this area again and determine whether it meets the requirements. If not, repeat the above operation again until it meets the requirements.

[0049] The process of post-grouting of pile foundation is as follows: start the grouting pump 13, the slurry 10 in the slurry storage tank 15 reaches the grouting pump 13 through the grouting pipe 14, and then is pressed into the grouting pipe 12. The slurry is injected into the pile end and the pile side soil through the pile side grouting pipe 17 and the pile end grouting pipe 18 pre-buried in the inner side of the steel cage to form a grouting body 9. The grouting speed and injection volume of the grouting pump are adjusted by the pressure relief valve 11 and the like to control the grouting effect.

[0050] The utility model uses the high-density resistivity method to monitor the post-grouting process of the pile foundation in real time, and infers the slurry flow path and the shape and area of ​​the consolidation area through the three-dimensional resistivity image, evaluates the strength of the soil after grouting, and can perform grouting reinforcement on the post-grouting area of ​​the pile foundation, so that each grouting area is bitten to form a biting effect, which greatly increases the bearing capacity of the pile foundation. In addition, the utility model can also perform grouting reinforcement treatment on weak or defective foundation strength areas and monitor the grouting process in real time.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for monitoring pile foundation and foundation grouting process, characterized in that, include: Base (1), rotating table (2), telescopic rod (3), support frame (5), high-density resistivity meter (7), pressure relief valve (11), slurry delivery pipe (12), auger rod (41), sliding bearing (44), limiting ring (45), electrode sheet (71), cable (72), counterweight device and motor; The base (1) is fixedly arranged on the pile foundation (8) to be monitored; a rotating platform (2) is arranged above the base (1); a first motor (21) is arranged above the rotating platform (2); one side of the rotating platform (2) is fixedly connected to the end of the telescopic rod (3); the other side of the rotating platform (2) is connected to the counterweight device; the front end of the telescopic rod (3) is connected to the support frame (5); a sliding bearing (44) is arranged on the support frame (5); a limiting ring (45) is arranged below the support frame (5); the sliding bearing (44) is away from the side of the support frame (5) A third motor (42) is provided, a spiral drill rod (41) is provided at the bottom of the third motor (42), and a slurry delivery pipe (12) passes through the interior of the spiral drill rod (41); a fourth motor (43) is provided above the sliding bearing (44) and is used to drive the sliding bearing (44) to slide up and down; a high-density resistivity meter (7) is provided on the counterweight device and is used to draw a three-dimensional resistivity image; the upper side of the pressure relief valve (11) is connected to the slurry delivery pipe (12), and the lower side is connected to the pile side grouting pipe (17) and the pile end grouting pipe (18); The electrode sheet (71) and the cable (72) constitute an electrode system, one end of the electrode sheet (71) is placed on the ground surface, and the other end is connected to one end of the cable (72); the high-density resistivity meter (7) is connected to the other end of the cable (72) and then connected to the electrode system, and is used to control the power supply and measurement state of the electrode system.

2. The device for monitoring pile foundation and foundation grouting process according to claim 1, characterized in that: The base (1) and the rotating platform (2) are connected via a sliding groove.

3. The device for monitoring pile foundation and foundation grouting process according to claim 1, characterized in that: The interior of the telescopic rod (3) includes a second motor (31), a hydraulic cylinder (32), a first gear (33), a second gear (34), a screw rod (35), a limit block (36), a sleeve (37), a push rod (38) and a fixing clamp (39); The second motor (31), the hydraulic cylinder (32) and the first gear (33) are located on the upper side of the interior of the telescopic rod (3), the second motor (31) and the hydraulic cylinder (32) are on the same horizontal line, and the second gear (34) is located below the first gear (33) and meshes with each other for transmission; one end of the spiral rod (35) is connected to the second gear (34), and the other end is connected to the limit block (36); the limit block (36) is arranged at one end of the push rod (38); the fixing clamp (39) is fixedly connected to the other end of the push rod (38) and is used to connect and fix the support frame (5); the sleeve (37) is arranged on the outside of the push rod (38).

4. The device for monitoring pile foundation and foundation grouting process according to claim 1, characterized in that: The auger rod (41) passes through the limiting ring (45); the interior of the auger rod (41) is hollow, and the slurry delivery pipe (12) passes through the hollow area of ​​the auger rod (41); and grouting channels and grouting holes are reserved above the drill bit and the drill body of the auger rod (41).

5. The device for monitoring pile foundation and foundation grouting process according to claim 1, characterized in that: The support frame (5) comprises a support rod (51), a first vertical rod (52), a second vertical rod (53), an upper cross rod (54), a lower cross rod (55), an upper connecting rod (56) and a lower connecting rod (57); the support rod (51) is fixedly connected to the first vertical rod (52) and the second vertical rod (53) via two upper cross rods (54) and a lower cross rod (55); the first vertical rod (52) and the second vertical rod (53) are fixedly connected via an upper connecting rod (56) and a lower connecting rod (57); a limiting ring (45) is provided below the support rod (51); Sliding pads (58) are provided at the bottoms of the support rod (51), the first vertical rod (52) and the second vertical rod (53).

6. The device for monitoring pile foundation and foundation grouting process according to claim 5, characterized in that: A sliding bearing (44) is provided between the first vertical rod (52) and the second vertical rod (53) in the support frame (5).

7. The device for monitoring pile foundation and foundation grouting process according to claim 1, characterized in that: The counterweight device comprises a counterweight block (61), a straight rod (62), an inclined rod (63), a top plate (64) and a bottom plate (65); One end of the bottom plate (65) is connected to the rotating table (2), and the top plate (64) and the bottom plate (65) are fixedly connected via an inclined rod (63) and two straight rods (62), wherein the bottom of the inclined rod (63) is fixedly connected to the bottom of the straight rod (62), and a high-density resistivity meter (7) is placed in a groove in the middle of the bottom plate (65); a counterweight (61) is placed at the other end of the bottom plate (65) to increase its own weight.

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