Membrane bag pile grouting quality control system and method based on geophysical exploration

Abstract

The present application belongs to the technical field of membrane bag pile grouting quality control, and provides a membrane bag pile grouting quality control system and method based on geophysical exploration, which has the technical scheme that a power cable lowering instruction is issued, and the number of times of lowering of the power cable is received; it is judged whether the number of times of lowering of the power cable continues to increase, when the number of times of lowering no longer increases, the number of times of lowering at this time is determined; the number of times of lowering and the depth of the borehole are compared, when the number of times of lowering and the depth of the borehole satisfy a set first condition, a water injection instruction is issued, in the process of water injection, the resistivity between electrodes is obtained; it is judged whether the resistivity between electrodes satisfies a set second condition, if yes, a grouting instruction is issued, sectional grouting is adopted, a pile forming model is obtained based on the reflected electromagnetic wave signal data obtained after grouting of the current section is completed, the inverted pile forming model and the theoretical pile forming model are compared, if the set condition is met, the grouting of the current section is completed, the next section grouting is carried out, and the grouting is completed.

Description

Technical Field

[0001] This invention belongs to the field of grouting quality control technology for membrane bag piles, and particularly relates to a grouting quality control system and method for membrane bag piles based on geophysical exploration. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] As a concealed engineering project, the quality of pile foundations is difficult to directly observe, especially in karst areas. Due to geological characteristics, the use of membrane bag grouting reinforcement can cause complex changes in the outer contour of the pile. The presence of karst caves can also lead to grout leakage and runoff. Therefore, strict control measures are necessary to ensure grouting quality. Traditional detection methods such as acoustic wave transmission and low-strain reflected wave methods can only be used to inspect the pile body after pile formation, and cannot perform segmented inspections during the grouting process. In addition, because the sound wave propagation path in these methods is limited to the inside of the pile, it is difficult to effectively reflect grout leakage outside the pile. Furthermore, since membrane bag grouting is a real-time changing process, real-time monitoring of the grouting process can promptly detect poor grouting phenomena, allowing for early intervention to avoid ineffective construction and saving significant resources. Existing monitoring methods, such as fiber optic monitoring, can roughly determine the grout diffusion range, but cannot accurately depict the grout leakage boundary, cannot construct the specific morphology of the membrane bag pile during the grouting process, and cannot control the grouting process in real time. Summary of the Invention

[0004] To address at least one of the technical problems in the background art, the first aspect of the present invention provides a membrane bag pile grouting quality control system based on geophysical exploration. Taking into account the real-time changing characteristics of membrane bag grouting, it adopts a segmented grouting method to monitor the grouting process in real time, which not only ensures the quality after grouting, but also ensures real-time monitoring of the quality of the grouting process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A first aspect of the present invention provides a geophysical exploration-based grouting quality control system for membrane bag piles, comprising a control host, a grouting system, a trans-hole resistivity CT monitoring system, and a borehole radar detection system; the grouting system includes a first controller, the trans-hole resistivity CT monitoring system includes a second controller, a third controller, a power supply cable, and multiple electrodes arranged on the power supply cable; one end of the power supply cable is connected to the second controller, and the other end is connected to the borehole radar detection system; the borehole radar detection system, the first controller, the second controller, and the third controller are respectively connected to the control host;

[0007] The control host is configured to send a power cable lowering command to the second controller and receive the number of times the power cable is lowered, determine the number of times the number of lowering will no longer increase; compare the number of lowering and the drilling depth, and when the number of lowering and the drilling depth meet the set first condition, send a water injection command to the third controller, and obtain the resistivity between the electrodes during the water injection process.

[0008] Determine whether the resistivity between the electrodes meets the set second condition. If so, interrupt water injection and send a grouting command to the first controller. Use segmented grouting. Based on the reflected electromagnetic wave signal data obtained after the current segment of grouting is completed, obtain the membrane bag pile inversion model. Compare the membrane bag pile inversion model with the theoretical model. If it meets the set conditions, the current segment of grouting is completed, and proceed to the next segment of grouting until the grouting is completed.

[0009] Furthermore, the grouting system also includes a grout storage tank, a grouting pipe, a grouting pump, and a digital pressure gauge. The grouting pipe is connected to the outlet section of the grouting pump, the inlet section of the grouting pump is connected to the grout storage tank, the digital pressure gauge is installed on the grouting pipe at the outlet section of the grouting pump, the grouting pump is equipped with a first controller, the digital pressure gauge is connected to the first controller, and the first controller is connected to a control host.

[0010] Furthermore, the transpore resistivity CT monitoring system also includes a high-density DC resistivity instrument, an electric winch, and a water injection system. An electric measuring tape is installed at the bottom of the electric winch, and the electric winch and measuring tape are respectively connected to a power supply cable, which is connected to a second controller. The water injection system includes a water injection pipe, a water injection pump, a water storage tank, and a third controller. The water injection pipe is connected to the outlet section of the water injection pump, the inlet section of the water injection pump is connected to the water storage tank, and the water injection pump is equipped with a third controller, which is connected to a control host.

[0011] The borehole radar detection system includes a radar antenna, a radar host, and a communication cable. One end of the communication cable is connected to the top of the radar antenna, and the other end is connected to one end of the radar host. A spring clip is installed at the bottom of the radar antenna. The other end of the radar host is connected to one end of a power supply cable, and the other end of the power supply cable is connected to a high-density DC resistivity instrument.

[0012] Furthermore, the electric measuring tape includes an electric rotating shaft, a housing, a measuring tape, a ring, an iron sheet, and a metal induction counter; wherein, the electric rotating shaft is installed inside the housing, the measuring tape is fixed on the electric rotating shaft, the ring and the iron sheet are installed on the measuring tape, and the metal induction counter is installed at the outlet of the housing.

[0013] Furthermore, the first preset condition is the difference between the number of times the cable is lowered and the depth of the hole. If the difference is less than the set error, the power cable is successfully lowered; otherwise, a command to lower the power cable in the opposite direction is sent to the second controller.

[0014] Furthermore, during the grouting process, the grouting pressure and grouting volume are obtained. If either the grouting pressure or the grouting volume exceeds the limit, a stop grouting command is sent to the first controller.

[0015] Furthermore, the control host is also configured to: during the segmented grouting process, after each segment of grouting is completed, acquire the resistivity data between each electrode after the current segment of grouting is completed; if there is a resistivity greater than a set resistivity threshold, stop acquiring resistivity data and issue a water injection command to inject water into the borehole; if the resistivity between all electrodes is less than the set resistivity threshold, issue a stop water injection command.

[0016] Based on the first aspect of the present invention, a quality control system for grouting of membrane bag piles based on geophysical exploration is provided. The second aspect of the present invention provides a grouting control method for membrane bag piles based on geophysical exploration. Considering the real-time changing characteristics of membrane bag grouting, a segmented grouting method is adopted to monitor the grouting process in real time, which not only ensures the quality after grouting, but also ensures real-time monitoring of the quality of the grouting process.

[0017] To achieve the above objectives, the present invention adopts the following technical solution:

[0018] A second aspect of the present invention provides a method for controlling grouting of membrane bag piles based on geophysical exploration, comprising the following steps:

[0019] Issue instructions for lowering power cables and receive the number of times power cables are lowered;

[0020] Determine if the number of times the power cable is lowered continues to increase; if the number of times it is lowered no longer increases, determine the number of times it is lowered at this point.

[0021] The number of times the drilled hole is lowered and the depth of the hole are compared. When the number of times the drilled hole is lowered and the depth of the hole meet the first set condition, a water injection command is issued. During the water injection process, the resistivity between the electrodes is obtained.

[0022] Determine whether the resistivity between the electrodes meets the set second condition. If so, interrupt water injection, issue a grouting command, and adopt segmented grouting. Based on the reflected electromagnetic wave signal data obtained after the current segment of grouting is completed, obtain the pile model. Compare the inverted pile model with the theoretical pile model. If it meets the set condition, the current segment of grouting is completed, and proceed to the next segment of grouting until the grouting is completed.

[0023] Furthermore, in the segmented grouting process, after each segment of grouting is completed, the resistivity data between each electrode after the current segment of grouting is completed is obtained. If there is a resistivity greater than the set resistivity threshold, the acquisition of resistivity data is stopped and a water injection command is issued to inject water into the borehole. If the resistivity between all electrodes is less than the set resistivity threshold, a stop water injection command is issued.

[0024] Furthermore, during the grouting process, the grouting pressure and grouting volume are obtained. If either the grouting pressure or the grouting volume exceeds the limit, a stop grouting command is sent to the first controller.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This invention takes into account the real-time changing characteristics of membrane bag grouting. It controls water injection by the number of times the power supply cable is lowered and the drilling depth, and controls grouting based on the resistivity during the water injection process. It adopts a segmented grouting method to monitor the grouting process in real time, which not only ensures the quality after grouting, but also ensures real-time monitoring of the quality of the grouting process.

[0027] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 A schematic diagram of the overall structure of the membrane bag pile grouting quality control system based on geophysical exploration provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the control host structure provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the grouting system provided in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram illustrating the cooperation between the grouting system and the trans-hole resistivity CT monitoring system provided in this embodiment of the invention;

[0033] Figure 5 This is a schematic diagram of the structure of an electric measuring tape provided in an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the borehole radar detection system provided in an embodiment of the present invention;

[0035] The system comprises: 1. Control host; 11. Control module; 12. Pressure monitoring module; 13. Grouting quality monitoring module; 14. Pile formation quality detection module; 2. Grouting system; 21. Grout storage tank; 22. Grouting pipe; 23. Grouting pump; 24. Digital pressure gauge; 25. First controller; 3. Transhole resistivity CT monitoring system; 31. High-density DC electrical resistivity instrument; 32. Power supply cable; 33. Battery; 34. Water injection system; 341. Water injection pipe; 342. Water injection pump; 343. Water storage tank; 344. Third controller; 35. Electric winch; 36. Second controller; 37. Electric measuring tape; 371. Electric rotating shaft; 372. Housing; 373. Measuring tape; 374. Ring; 375. Metal induction counter; 4. Drilling radar detection system; 41. Radar antenna; 42. Radar host; 43. Communication cable; 5. Drill hole; 6. Electrode; 7. Spring buckle. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] like Figure 1 As shown, as an embodiment of the present invention, this embodiment provides a membrane bag pile grouting quality control system based on geophysical exploration, including a control host 1, a grouting system 2, a cross-hole resistivity CT monitoring system 3, and a borehole radar detection system 4;

[0040] like Figure 2 As shown, the control host 1 includes a control module 11, a pressure monitoring module 12, a grouting quality monitoring module 13, and a pile formation quality detection module 14;

[0041] like Figure 3As shown, the grouting system 2 includes a grout storage tank 21, a grouting pipe 22, a grouting pump 23, a digital pressure gauge 24, and a first controller 25. The grouting pipe 22 is connected to the outlet section of the grouting pump 23, and the inlet section of the grouting pump 23 is connected to the grout storage tank 21. The digital pressure gauge 24 is installed on the grouting pipe 22 at the outlet section of the grouting pump 23. The first controller 25 is installed on the grouting pump 23. The digital pressure gauge 24 and the first controller 25 are connected. The first controller 25 is connected to the control host 1.

[0042] like Figures 4-5 As shown, the transpore resistivity CT monitoring system 3 includes a high-density DC resistivity instrument 31, a power supply cable 32, a battery 33, a water injection system 34, an electric winch 35, a second controller 36, and multiple electrodes 6 arranged on the power supply cable 32; an electric measuring tape 37 is installed at the bottom of the electric winch 35, one end of the power supply cable 32 is connected to the electric winch 35, and the other end is connected to the electric measuring tape 37; the electric winch 35 and the electric measuring tape 37 are respectively connected to the second controller 36.

[0043] The water injection system 34 includes a water injection pipe 341, a water injection pump 342, a water storage tank 343, and a third controller 344. The water injection pipe 341 is connected to the outlet section of the water injection pump 342, the inlet section of the water injection pump 342 is connected to the water storage tank 343, and the water injection pump 342 is equipped with a third controller 344, which is connected to the control host 1.

[0044] Furthermore, the battery 33 is connected to the high-density DC power meter 31 to provide it with a stable DC power supply. The current is transmitted to a specific power supply electrode through a power supply cable. The electrode inputs a stable DC power into the ground, forming an artificial stable electric field in the underground medium.

[0045] In this embodiment, electrodes 6 are arranged on the tail 1 / 3 of the length of the power supply cable 32, and spring buckles 7 are attached to the end of the power supply cable 32; the length of the power supply cable 32 is at least three times the depth of the drill hole 5.

[0046] Furthermore, the electric measuring tape 37 includes an electric rotating shaft 371, a housing 372, a measuring tape 373, a ring 374, an iron sheet, and a metal induction counter 375; wherein, the electric rotating shaft 371 is disposed inside the housing 372, the measuring tape 373 is fixed on the electric rotating shaft 371, the ring 374 and the iron sheet are disposed on the measuring tape 373, and the metal induction counter 375 is disposed at the outlet of the housing 372.

[0047] Specifically, the measuring tape 373 has a ring 374 at the 0m mark, and a small iron piece is attached to each integer meter mark. The end of the measuring tape 373 is fixed to the electric rotating shaft 371.

[0048] like Figure 6 As shown, the borehole radar detection system 4 includes a radar antenna 41, a radar host 42, and a communication cable 43. The radar antenna 41 includes a transmitting antenna and a receiving antenna, and a spring clip 7 is attached to the tail of the radar antenna 41. The length of the communication cable 43 is at least three times the depth of the borehole 5.

[0049] The control host is configured to send a power cable lowering command to the second controller and receive the number of times the power cable is lowered, determine the number of times the number of lowering will no longer increase; compare the number of lowering and the drilling depth, and when the number of lowering and the drilling depth meet the set first condition, send a water injection command to the third controller, and obtain the resistivity between the electrodes during the water injection process.

[0050] Determine whether the resistivity between the electrodes meets the set second condition. If so, interrupt water injection and send a grouting command to the first controller. Use segmented grouting. Based on the reflected electromagnetic wave signal data obtained after the current segment of grouting is completed, obtain the membrane bag pile inversion model. Compare the membrane bag pile inversion model with the theoretical model. If it meets the set conditions, the current segment of grouting is completed, and proceed to the next segment of grouting until the grouting is completed.

[0051] The specific working principle includes:

[0052] The grouting process is monitored using a trans-hole resistivity CT monitoring system 3. An electric winch 35 is fixed at the outlet of a borehole 5. A second controller 36 is connected to a control host 1. Two interfaces are branched off from the other end of the second controller 36, which are connected to an electric tape measure 37 and an electric winch 35, respectively. A power supply cable 32 is connected to a high-density DC electrical resistivity instrument 31. The operation control module 11 sends a command to the second controller 36. The second controller 36 starts the electric winch 35 and winds the part of the power supply cable 32 with the electrode 6 onto the electric winch 35.

[0053] Connect the spring clip 7 to the ring 374, place the end of the power supply cable 32 directly above the borehole 5, and the operation control module 11 sends a command to the second controller 36. The second controller 36 starts the electric winch 35 to lower the power supply cable 32 into the borehole at a uniform speed. Every 1m that the end of the power supply cable 32 descends, it will cause the ring 374 to descend by 1m, thereby stretching the measuring tape 373 outward by 1m. Every time the measuring tape 373 is stretched outward by 1m, the metal induction counter 375 detects a tiny iron piece and transmits this information to the control module 11 via the second controller 36. The control module 11 automatically starts counting from 0 and increments by 1 each time.

[0054] When the control module 11 detects that the number is no longer increasing, it automatically sends a command to the second controller 36 to stop the electric winch 35 and the lowering of the power cable 32. If the number in the control module 11 is close to the depth of the borehole 5 (within 1m of error), it indicates that the power cable 32 has been successfully lowered; if the number in the control module 11 is significantly less than the depth of the borehole 5, it indicates that the end of the power cable 32 has not been lowered to the bottom of the borehole 5. The control module 11 automatically sends a command to the second controller 36, which starts the electric winch 35 to rotate in the opposite direction and simultaneously starts the electric shaft 371 to retract the power cable 32 and the measuring tape 373. The electric winch 35 and the electric shaft 371 rotate at the same linear speed. Every time the measuring tape 373 is retracted by 1m, the metal induction counter 375 detects a small piece of iron and transmits this information to the control module 11 via the second controller 36. The control module 11 automatically starts counting from the number at the time of stopping and decrements by 1 each time.

[0055] When the control module 11 detects a value of 0, it automatically sends a command to the second controller 36 to stop the operation of the electric winch 35 and to stop the retraction of the power supply cable 32 and the measuring tape 373. The on-site personnel then inspect and address the issue at borehole 5, after which the process of lowering the power supply cable 32 is repeated.

[0056] The power supply cable 32 was laid down in the remaining holes using the same method.

[0057] After the control module 11 detects that all power supply cables 32 have been successfully lowered, it automatically sends a command to the third controller 344 to start the water injection pump 342, which draws water from the reservoir 343 and injects it into the borehole 5 through the water injection pipe 341. Simultaneously, the high-density DC resistivity instrument 31 monitors the resistivity between the electrodes 6. When the resistivity between all electrodes 6 is less than a predetermined value, the control module 11 automatically sends a command to the third controller 344 and the high-density DC resistivity instrument 31 to stop the water injection pump 342. Data acquisition can then commence, specifically by one or a pair of power supply electrodes supplying power to the underground, while another one or a pair of measuring electrodes collects potential or potential difference data. By arranging and combining the power supply and measuring electrodes, resistivity information at different underground locations can be obtained.

[0058] A segmented grouting method is used for membrane bag grouting. During the grouting process, the digital pressure gauge 24 monitors the grouting pressure in real time and transmits the pressure information to the pressure monitoring module 12 of the control host 1. The pressure monitoring module 12 determines whether the pressure exceeds the limit value. If it does, the control host 1 automatically sends a command to the first controller 25 to stop the grouting pump 23 from continuing grouting. In addition, grouting is also stopped when the grouting volume in a certain segment is significantly greater than the expected grouting volume.

[0059] After each grouting section is completed, a high-density DC resistivity instrument 31 is used for data acquisition. During the data acquisition process, the grouting quality monitoring module 13 automatically saves the acquisition progress. If the resistivity of electrode 6 is too high, the high-density DC resistivity instrument 31 automatically stops acquisition. The grouting quality monitoring module 13 receives the information and transmits it to the third controller 344. The third controller 344 starts the water injection pump 342 to inject water into the borehole 5. When the resistivity between all electrodes 6 is less than the limit value, the control module 11 automatically sends a command to the third controller 344 and the high-density DC resistivity instrument 31 to stop the water injection pump 342 and continue the data acquisition work. The grouting quality monitoring module 13 automatically reads the saved acquisition progress and continues the data acquisition task from the interrupted position.

[0060] Based on the site conditions, a theoretical membrane bag pile model is generated in the grouting quality monitoring module 13 for comparison with the inversion results. After the potential or potential difference at different electrodes is collected by the cross-hole resistivity CT, the grouting quality monitoring module 13 is used for inversion to convert the collected potential or potential difference data into the resistivity values ​​of the grid cells in the model.

[0061] It should be noted that the specific inversion method only needs to use an inversion model that can achieve the desired result, and the detailed process will not be described further.

[0062] After the inversion is completed, the theoretical model and the inverted model are compared. If the inverted model shows obvious bulging, grout leakage, or other problems, subsequent segmented grouting will not be carried out, and on-site personnel will investigate the issues. If the inverted model shows good pile formation results, the next segment of membrane bag grouting will begin until grouting is complete.

[0063] After grouting is completed, the control module 11 of the operation control host 1 sends a command to the second controller 36. The second controller 36 starts the electric winch 35 to rotate in the opposite direction, and simultaneously starts the electric shaft 371 to retract the power supply cable 32 and the measuring tape 373. The electric winch 35 and the electric shaft 371 rotate at the same linear speed. Every time the measuring tape 373 is retracted by 1 meter, the metal induction counter 375 detects a tiny iron piece and transmits this information to the control module 11 via the second controller 36. The control module 11 automatically starts counting from the number at the time of stopping, decrementing by 1 each time. When the control module 11 detects a number of 0, it automatically sends a command to the second controller 36 to stop the electric winch 35 and stop the retraction of the power supply cable 32 and the measuring tape 373.

[0064] During the lowering process, the radar antenna 41 transmits electromagnetic wave signals, and the receiving antenna receives the reflected electromagnetic wave signals and transmits them to the radar host 42. The radar host 42 then transmits the received signal data to the pile quality detection module 14 in real time.

[0065] Piling quality inspection is performed using a borehole radar inspection system 4. Ensure there is no other equipment inside the borehole 5 and that the borehole is dry. Connect the head of the communication cable 43 to the radar host 42. The control module 11 sends a command to the second controller 36, which starts the electric winch 35, winding the tail 1 / 3 of the communication cable 43 onto the winch 35. Connect the tail end of the communication cable 43 to the radar antenna 41. Connect the ring 374 to the spring clip 7. Fix the electric winch 35 beside the borehole 5, and place the radar antenna 41 directly above the borehole 5. The operation control module 11 sends a command to the second controller 36, which starts the electric winch 35, lowering the communication cable 43 and radar antenna 41 into the borehole at a uniform speed. For every 1m the radar antenna 41 descends, the ring 374 descends by 1m, thus stretching the measuring tape 373 outward by 1m. For every 1 meter the measuring tape 373 extends outward, the metal induction counter 375 detects a tiny piece of iron and transmits this information to the control module 11 via the second controller 36. The control module 11 automatically starts counting from 0 and increments by 1 each time. When the control module 11 detects that the number is no longer increasing, it automatically sends a command to the second controller 36 to stop the electric winch 35 and stop lowering the radar antenna 41. If the number in the control module 11 is close to the depth of the borehole 5, it indicates that the radar antenna 41 has been successfully lowered; if the number in the control module 11 is significantly less than the depth of the borehole 5, it indicates that the end of the radar antenna 41 has not been lowered to the bottom of the borehole 5. In this case, the control module 11 automatically sends a command to the second controller 36, which then starts the electric winch 35 to rotate in the opposite direction and simultaneously starts the electric shaft 371 to retract the radar antenna 41, communication cable 43, and measuring tape 373. The electric winch 35 and the electric shaft 371 rotate at the same linear speed. Every time the measuring tape 373 is retracted by 1 meter, the metal induction counter 375 detects a tiny iron piece and transmits the information to the control module 11 via the second controller 36. The control module 11 automatically starts counting from the number at the time of stopping and decrements by 1 each time.

[0066] When the control module 11 detects a value of 0, it automatically sends a command to the second controller 36 to stop the operation of the electric winch 35 and to stop the retrieval of the radar antenna 41, communication cable 43, and measuring tape 373. The drill hole 5 is then inspected and repaired by on-site personnel, after which the process of lowering the radar antenna 41 is repeated.

[0067] After the radar antenna 41 is successfully lowered, the control module 11 automatically sends a command to the second controller 36. The second controller 36 starts the electric winch 35 to rotate in the opposite direction and simultaneously starts the electric shaft 371 to retract the radar antenna 41, communication cable 43, and measuring tape 373. The electric winch 35 and the electric shaft 371 rotate at the same linear speed. Every time the measuring tape 373 is retracted by 1 meter, the metal induction counter 375 detects a tiny piece of iron and transmits this information to the control module 11 via the second controller 36. The control module 11 automatically starts counting from the number at the time of stopping and decrements by 1 each time.

[0068] When the control module 11 detects a number of 0, it automatically sends a command to the second controller 36 to stop the operation of the electric winch 35 and to stop the retraction of the radar antenna 41, communication cable 43 and tape measure 373.

[0069] During the ascent of radar antenna 41, the transmitting antenna emits electromagnetic wave signals, and the receiving antenna receives the reflected electromagnetic wave signals and transmits them to the radar host 42. The radar host 42 then transmits the received signal data to the pile quality detection module 14 in real time.

[0070] The pile quality inspection module 14 automatically processes and inverts the data to determine whether there are defects in the pile foundation.

[0071] like Figure 2 As shown, as an embodiment of the present invention, this embodiment provides a method for quality control of membrane bag pile grouting based on geophysical exploration, including the following steps:

[0072] Step 1: Issue the power cable lowering instruction and receive the number of times the power cable is lowered;

[0073] Step 2: Determine if the number of times the power cable is lowered continues to increase. If the number of times it is lowered no longer increases, determine the current number of times it is lowered.

[0074] Step 3: Compare the number of times the hole is lowered and the depth of the hole. When the number of times the hole is lowered and the depth of the hole meet the set first condition, issue a water injection command. During the water injection process, obtain the resistivity between the electrodes.

[0075] Step 4: Determine whether the resistivity between the electrodes meets the set second condition. If so, interrupt water injection, issue a grouting command, adopt segmented grouting, and obtain the reflected electromagnetic wave signal data after the current segment of grouting is completed.

[0076] As a further implementation, during each grouting process, the grouting pressure is acquired, and it is determined whether the pressure exceeds the pressure limit. When the limit is exceeded, a grouting stop command is issued, and resistivity data between electrodes is acquired after the current grouting is completed.

[0077] In this embodiment, after each grouting section is completed, the resistivity data between the electrodes is acquired. If there is a resistivity greater than the set resistivity threshold, the acquisition of resistivity data is stopped and a water injection command is issued to inject water into the borehole. If the resistivity between all electrodes is less than the set resistivity threshold, a stop water injection command is issued.

[0078] Step 5: Based on the reflected electromagnetic wave signal data obtained after the current grouting is completed, a pile model is obtained. The inverted pile model is compared with the theoretical pile model. If the set conditions are met, the current grouting is completed, and the next grouting is carried out until the grouting is completed.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A grouting quality control system for membrane bag piles based on geophysical exploration, characterized in that, The system includes a control host, a grouting system, a cross-hole resistivity CT monitoring system, and a borehole radar detection system. The grouting system includes a first controller, and the cross-hole resistivity CT monitoring system includes a second controller, a third controller, a power supply cable, and multiple electrodes arranged on the power supply cable. One end of the power supply cable is connected to the second controller, and the other end is connected to the borehole radar detection system. The borehole radar detection system, the first controller, the second controller, and the third controller are all connected to the control host. The control host is configured to send a power cable lowering command to the second controller and receive the number of times the power cable is lowered, determine the number of times the number of lowering will no longer increase; compare the number of lowering and the drilling depth, and when the number of lowering and the drilling depth meet the set first condition, send a water injection command to the third controller, and obtain the resistivity between the electrodes during the water injection process. The first preset condition is the difference between the number of times the cable is lowered and the depth of the hole. If the difference is less than the set error, the power cable is successfully lowered; otherwise, a command to lower the power cable in the opposite direction is sent to the second controller. Determine whether the resistivity between the electrodes meets the set second condition. If so, interrupt water injection and send a grouting command to the first controller. Use segmented grouting. Based on the reflected electromagnetic wave signal data obtained after the current segment of grouting is completed, obtain the membrane bag pile inversion model. Compare the membrane bag pile inversion model with the theoretical model. If it meets the set conditions, the current segment of grouting is completed, and proceed to the next segment of grouting until the grouting is completed.

2. The geophysical exploration-based membrane bag pile grouting quality control system as described in claim 1, characterized in that, The grouting system also includes a grout storage tank, a grouting pipe, a grouting pump, and a digital pressure gauge. The grouting pipe is connected to the outlet section of the grouting pump, the inlet section of the grouting pump is connected to the grout storage tank, the digital pressure gauge is installed on the grouting pipe at the outlet section of the grouting pump, the grouting pump is equipped with a first controller, the digital pressure gauge is connected to the first controller, and the first controller is connected to a control host.

3. The geophysical exploration-based membrane bag pile grouting quality control system as described in claim 1, characterized in that, The transpore resistivity CT monitoring system also includes a high-density DC resistivity instrument, an electric winch, and a water injection system. An electric measuring tape is installed at the bottom of the electric winch, and both the electric winch and the electric measuring tape are connected to a power supply cable, which is connected to a second controller. The water injection system includes a water injection pipe, a water injection pump, a water storage tank, and a third controller. The water injection pipe is connected to the outlet section of the water injection pump, and the inlet section of the water injection pump is connected to the water storage tank. The water injection pump is equipped with a third controller, which is connected to a control host. The borehole radar detection system includes a radar antenna, a radar host, and a communication cable. One end of the communication cable is connected to the top of the radar antenna, and the other end is connected to one end of the radar host. A spring clip is installed at the bottom of the radar antenna. The other end of the radar host is connected to one end of a power supply cable, and the other end of the power supply cable is connected to a high-density DC resistivity instrument.

4. The geophysical exploration-based membrane bag pile grouting quality control system as described in claim 3, characterized in that, The electric measuring tape includes an electric shaft, a housing, a measuring tape, a ring, an iron sheet, and a metal induction counter; wherein, the electric shaft is installed inside the housing, the measuring tape is fixed on the electric shaft, the ring and the iron sheet are installed on the measuring tape, and the metal induction counter is installed at the outlet of the housing.

5. The geophysical exploration-based membrane bag pile grouting quality control system as described in claim 1, characterized in that, During the grouting process, the grouting pressure and grouting volume are obtained. If either the grouting pressure or the grouting volume exceeds the limit, a stop grouting command is sent to the first controller.

6. The geophysical exploration-based membrane bag pile grouting quality control system as described in claim 1, characterized in that, The control host is also configured to: during the segmented grouting process, after each segment of grouting is completed, acquire the resistivity data between each electrode after the current segment of grouting is completed; if there is a resistivity greater than the set resistivity threshold, stop acquiring resistivity data and issue a water injection command to inject water into the borehole; if the resistivity between all electrodes is less than the set resistivity threshold, issue a stop water injection command.

7. A method for quality control of grouting in membrane bag piles based on geophysical exploration, characterized in that, The geophysical exploration-based membrane bag pile grouting quality control system according to any one of claims 1-6 includes the following steps: Issue instructions for lowering power cables and receive the number of times power cables are lowered; Determine if the number of times the power cable is lowered continues to increase; if the number of times it is lowered no longer increases, determine the number of times it is lowered at this point. The number of times the drilled hole is lowered and the depth of the hole are compared. When the number of times the drilled hole is lowered and the depth of the hole meet the first set condition, a water injection command is issued. During the water injection process, the resistivity between the electrodes is obtained. Determine whether the resistivity between the electrodes meets the set second condition. If so, interrupt water injection, issue a grouting command, and adopt segmented grouting. Based on the reflected electromagnetic wave signal data obtained after the current segment of grouting is completed, obtain the pile model. Compare the inverted pile model with the theoretical pile model. If it meets the set condition, the current segment of grouting is completed, and proceed to the next segment of grouting until the grouting is completed.

8. The method for quality control of membrane bag pile grouting based on geophysical exploration as described in claim 7, characterized in that, During the segmented grouting process, after each segment of grouting is completed, the resistivity data between each electrode after the current segment of grouting is completed is acquired. If there is a resistivity greater than the set resistivity threshold, the acquisition of resistivity data is stopped and a water injection command is issued to inject water into the borehole. If the resistivity between all electrodes is less than the set resistivity threshold, a stop water injection command is issued.

9. The method for quality control of membrane bag pile grouting based on geophysical exploration as described in claim 7, characterized in that, During the grouting process, the grouting pressure and grouting volume are obtained. If either the grouting pressure or the grouting volume exceeds the limit, a stop grouting command is sent to the first controller.

Images