A monitoring device and method for overfilling of cast-in-place piles based on measured resistivity method

Abstract

The invention relates to a bored pile over-pouring device based on a measured resistivity method. The device comprises: a first sensor and a second sensor, wherein the first sensor and the second sensor are respectively arranged at the bottom of the bored pile and at an appropriate position covering an elevation position inside the bored pile, and all measuring electrodes of the first sensor and the second sensor are placed on the inner wall of an insulating pipe sleeve and fixed by a binding belt. A control host determines the resistivity of pure concrete at the bottom of the bored pile, and calculates in real time the resistivity of an appropriate position covering the elevation position inside the bored pile. The control host compares in real time the proximity of the resistivity values ​​of the second sensor and the first sensor at the positions thereof, determines the position of the poured concrete reaching the inside of the pile, controls an over-pouring traffic light to display different colors, reminds staff to adopt different over-pouring speeds and stop pouring concrete in time, thereby achieving the purpose of early warning and precise control of concrete over-pouring.

Description

Technical Field

[0001] The invention relates to the technical field of monitoring over-filling of cast-in-place piles, and in particular to a monitoring device and method for over-filling of cast-in-place piles based on a measured resistivity method. Background Art

[0002] In the construction of bored piles, over-pouring is common. The reasons are as follows: the height of the upper interface of pure concrete is not visible when pouring concrete; when pouring concrete, the sediment at the bottom of the pile and the impurities precipitated in the mud during the pouring process will accumulate to a certain thickness on the concrete surface, and the pile head is prone to form floating slurry; the pouring process requires continuous construction, otherwise bubbles will be generated in the pile, affecting the quality of the pile. In order to ensure the quality of the pile, over-pouring is carried out in actual construction. However, it is necessary to monitor the over-pouring concrete to avoid excessive over-pouring and waste of concrete.

[0003] Since the overfilling concrete liquid level is uncontrollable at the construction site, the overfilling height can reach 2 to 3 meters. The piles are often of different heights, resembling a "stone forest". Such overfilling causes concrete waste, and removing excess pile heads consumes more resources. Therefore, it is necessary to effectively monitor overfilling to minimize the overfilling amount while ensuring the quality of the piles. Common overfilling monitoring methods include the volume method and the heavy hammer method. If the diameter of the pile hole changes during construction, it is not feasible to control overfilling by the volume method; and the heavy hammer method basically relies on the experience of workers, and the measurement results vary from person to person, which may still produce a lot of uneven overfilling heights.

[0004] The prior art proves that resistivity can be used as a parameter to characterize the strength of concrete. Technicians can determine the exact location of the interface layer between concrete and mud based on the resistivity conductive mechanism. Patent document with application number CN201410833047.6 discloses a bored pile concrete interface monitoring device, which can test the electrical impedance physical properties and sensitivity of concrete, mud, water and other media during the underwater concrete pouring process of bored piles, and locate the concrete pouring interface by measuring the electrical impedance difference between water, mud and concrete during the pouring process. However, during the pouring process, since the mud and concrete are flipped up and down, the fluid medium in the borehole changes greatly, and the electrical parameter value changes violently and is not easy to stabilize, which affects the monitoring device's measurement of the fluid medium's electrical impedance. The patent document with application number CN201911338295.2 discloses a force-electricity complementary detection probe and over-pouring detection device, which selects the concrete used for on-site pouring before formal pouring, calibrates its electrical parameter rotation torque parameter, and continuously compares the real-time electrical parameters and torque values ​​during the pouring process with the calibrated preset values ​​to achieve the goal of controlling the pouring liquid level. However, the invention needs to calibrate the parameters of the concrete before pouring the concrete, and its measurement environment is quite different from the actual environment of the bored pile, and the preset value cannot be well matched with the concrete parameters during the pouring process; secondly, the device only sets one measuring point at the elevation position, and even if the alarm sounds, the concrete pouring process cannot be stopped immediately; in addition, there are differences in the resistivity values ​​of each batch of concrete, and the detection probe is affected by the surrounding environment of the borehole, especially the steel cage, which cannot be ignored. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to determine the position of the upper interface of pure concrete in the cast-in-place pile in advance and achieve accurate control of the over-casting amount while avoiding interference of the steel cage on the measurement.

[0006] The present invention solves the above technical problems through the following technical means:

[0007] The embodiment of the present invention provides a bored pile overfilling monitoring device based on the measured resistivity method, the device comprising: a first sensor, a second sensor, a cable, a control host, and an overfilling traffic light;

[0008] The first sensor comprises a first electrode and a first insulating sleeve, and is used to measure parameter data of the resistivity of pure concrete at the bottom of the cast-in-place pile, wherein the first electrode comprises at least two measuring electrodes separated by a distance from each other.

[0009] The second sensor includes a second electrode and a second insulating sleeve, and is used to measure in real time the parameter data of the resistivity of the slurry between all measuring electrodes above and below the elevation position in the cast-in-place pile during the pouring process. The second electrode includes at least two measuring electrodes separated by a distance from each other.

[0010] It is the most ideal state that the overfilling level of concrete in the cast-in-place pile just reaches the elevation position. However, since the concrete and mud are constantly turning during the pouring process, the voltage between adjacent measuring electrodes is unstable. By arranging the second sensor including multiple measuring electrodes separated by a distance at a place covering the elevation position in the cast-in-place pile, and the number of measuring electrodes of the second sensor located below the elevation position in the cast-in-place pile is greater than the number of measuring electrodes located above the elevation position in the cast-in-place pile, the resistivity of the slurry at each position in the cast-in-place pile can be calculated as soon as possible according to the parameter data, and the distance between the upper interface of the pure concrete and the elevation position in the cast-in-place pile during the pouring process can be judged in advance.

[0011] The control host supplies power to the two power supply electrodes of the first sensor and the second sensor through two cores of the cable to ensure that the working voltages of the first sensor and the second sensor are consistent, and the remaining cores are used to connect to the measuring electrodes of the first sensor and the second sensor. The control host receives the current value between the two power supply electrodes of the first sensor and the voltage between the two measuring electrodes, and then calculates and determines the resistivity of the bottom position of the cast-in-place pile when it is covered by the pure concrete according to Ohm's law; the control host obtains the voltage between each two adjacent measuring electrodes according to the current value between the two power supply electrodes of the second sensor and the potential of each measuring electrode, and calculates the resistivity of each position within the length range of the second sensor in real time. The first sensor and the second sensor cooperate with the control host to realize the calculation of the resistivity of the slurry in the over-casting process of the cast-in-place pile.

[0012] The control host monitors the pouring process of concrete in the cast-in-place pile in real time.

[0013] The advantage of a bored pile overfilling monitoring device based on the measured resistivity method is that: a sensor is respectively placed above and below the bored pile, the real resistivity of the bored pile concrete is determined according to the measurement data of the first sensor, and the current position of the upper interface of the pure concrete is judged according to the measurement data transmitted in real time by the second sensor, thereby eliminating the step of calibrating the concrete resistivity parameters in advance before each bored pile is poured, and avoiding the situation where the pre-calibrated concrete resistivity parameters are inaccurate due to the different qualities of different batches of concrete.

[0014] Furthermore, the cable connected to the first sensor is a multi-core cable, and the four taps of the cable are used as the first electrode. The first electrode includes two power supply electrodes and two measuring electrodes. The two power supply electrodes are located at both ends of the first sensor, and the two measuring electrodes are spaced a distance apart and distributed between the two power supply electrodes of the first electrode. The first sensor is fixed to the bottom of the cast-in-place pile by a binding belt to measure parameter data, and the parameter data includes the current value between the two power supply electrodes and the voltage between the two measuring electrodes. During the pouring process, when the bottom of the cast-in-place pile successively experiences the three states of the slurry in mud, a mixture of mud and concrete, and pure concrete, the control host will correspondingly calculate the resistivity ρ in the three states 泥浆 , 泥浆-混凝土 , 混凝土 .

[0015] Furthermore, the second sensor is fixed to an appropriate position covering the elevation position inside the cast-in-place pile by a binding belt; the cable connected to the second sensor is a multi-core cable, and n+2 of the cable taps are used as second electrodes. The length of the second sensor is L, and the second electrode includes 2 power supply electrodes and n measuring electrodes, and the 2 power supply electrodes are located at both ends of the second sensor, and the n measuring electrodes are equally spaced and distributed between the 2 power supply electrodes. The second electrode spacing is The spacing between the n measuring electrodes is the same as the spacing between the first electrodes of the first sensor, and the measuring electrodes are numbered M1 to M2 from bottom to top. n According to the potential value of each two adjacent measuring electrodes, the voltage between the two adjacent measuring electrodes and the current value between the two power supply electrodes are obtained, and then the resistivity between each two adjacent measuring electrodes is calculated as ρ MiMi+1 (i∈[1, n-1]); the spacing between all measuring electrodes of the second sensor is equal to the distance between the two measuring electrodes of the first sensor, so as to reduce the error caused by other factors as much as possible, so that the judgment effect of the position of the interface on the pure concrete is more accurate.

[0016] Furthermore, the first insulating sleeve and the second insulating sleeve are both hollow structures, the first electrode of the first sensor is placed on the inner wall of the first insulating sleeve, the second electrode of the second sensor is placed on the inner wall of the second insulating sleeve, and the first sensor and the second sensor are both fixed at a distance from the steel cage and on the side away from the grouting pipe; all measuring electrodes are fixedly adhered to the inner wall of the insulating sleeve, and the first sensor and the second sensor are both fixed at a distance from the steel cage and on the side away from the grouting pipe by binding tape, so as to reduce the interference of the surrounding environment of the steel cage and the grouting pipe drilling on the sensor measurement and improve the accuracy of the parameter measurement of the first sensor and the second sensor.

[0017] Furthermore, the device also includes an over-filled traffic light, which is connected to the control host and can display three states: green light, yellow light, and red light. The control host compares the real-time resistivity of each position within the length range of the second sensor with the resistivity of the pure concrete determined at the bottom position of the cast-in-place pile, and controls the over-filled traffic light to display lights of different colors based on the comparison results.

[0018] Furthermore, when the over-filling traffic light is green, concrete is poured at a normal speed; when the over-filling traffic light shows yellow, the concrete pouring speed is gradually reduced; when the over-filling traffic light shows red, the concrete pouring is stopped, thereby achieving the purpose of accurately controlling the over-filling amount; when the over-filling traffic light shows green, it means that the over-filling liquid level has not reached the first group of measuring electrodes at the lowest end of the second sensor, and the pouring liquid level has not reached the elevation position, and the staff continues to perform pouring work according to the current pouring pressure; when the over-filling traffic light is yellow, it means that the pouring liquid level is close to the elevation position, and the staff gradually reduces the pouring pressure, thereby slowly reducing the pouring speed; when the over-filling traffic light is red, it means that the pouring liquid level of the slurry has reached the elevation position, and the staff stops the pouring work, thereby achieving the purpose of accurately controlling the over-filling amount.

[0019] Furthermore, the device is used in batches, and the measured parameter information is notified to the manager in real time, so that the manager can remotely monitor the pouring progress of all bored piles on the entire construction site; multiple devices can monitor the pouring construction work of multiple bored piles, and send the parameter information in the control host to the manager's mobile phone, so that the manager can supervise the multiple bored piles in real time. When using a public network or a specially arranged network, the manager can remotely monitor all the bored piles on the entire construction site.

[0020] The embodiment of the present invention further provides a method for monitoring the over-filling of a bored pile by measuring resistivity, the method comprising:

[0021] According to the parameter data of the first sensor, the resistivity of the pure concrete at the bottom of the cast-in-place pile is determined; the resistivity of the pure concrete at the bottom of the cast-in-place pile is determined by the control host according to the current value between the two power supply electrodes of the first sensor and the voltage between the two measuring electrodes, and the control host sequentially receives and calculates the resistivity ρ of the slurry at the location of the first sensor in the three states of mud, a mixture of mud and concrete, and pure concrete 泥浆 , 泥浆-混凝土 , 混凝土 ;

[0022] The control host receives parameter data of each position within the length range of the second sensor in real time, and calculates the resistivity above and below the elevation position in the cast-in-place pile; the control host calculates the resistivity between each measuring electrode in the second sensor in real time according to the current value between the two power supply electrodes of the second sensor and the voltage between each two adjacent measuring electrodes;

[0023] The resistivity of the cast-in-place pile at the upper and lower elevation positions is compared with the resistivity of pure concrete determined at the bottom position of the cast-in-place pile;

[0024] The pouring process of concrete in the cast-in-place pile is monitored in real time.

[0025] The control host is connected to the first sensor and the second sensor respectively through cables. The control host calculates and determines the resistivity of pure concrete at the bottom of the cast-in-place pile according to the parameter data of the first sensor and the second sensor, and calculates the resistivity of each position within the length range of the second sensor in real time; the control host calculates the resistivity of the slurry in different states according to the parameter data of the slurry in the cast-in-place pile when it is in three states of mud, a mixture of mud and concrete, and pure concrete. Since the resistivity value of pure concrete is the largest, the control host calculates the resistivity value from small to large according to the parameter data of the first sensor until the calculated resistivity value remains unchanged at the maximum value, and the resistivity of the cast-in-place pile when it is covered by the pure concrete can be determined.

[0026] As a further optimization scheme, based on the comparison results, the distance between the upper interface of the concrete and the elevation position inside the cast-in-place pile is judged, and the over-casting traffic light is controlled to display lights of different colors.

[0027] The advantages of the present invention are:

[0028] 1. The real resistivity of the concrete at the bottom of the cast-in-place pile is measured without calibrating the resistivity parameters of the concrete sample in advance, thus solving the problem of recalibrating different batches of concrete;

[0029] 2. All electrodes of the first sensor and all electrodes of the second sensor are placed inside the insulating casing of the hollow structure to reduce the interference of the steel cage and the surrounding environment of the grouting borehole on the resistivity measurement of the slurry in the cast-in-place pile, and improve the measurement accuracy of the slurry in the cast-in-place pile during the pouring process;

[0030] 3. Continuously measure the distance above and below the elevation position of the cast-in-place pile in real time to improve the measurement accuracy and achieve the effect of early warning;

[0031] 4. The control host controls the status of the over-filling red and green lights in real time according to the resistivity value, which can remind the construction personnel that the green light means normal concrete pouring, the yellow light means slowing down the concrete pouring, and the red light means stopping the concrete pouring, which can intuitively and effectively remind the construction personnel to monitor the over-filling of concrete;

[0032] 5. It can be applied to all bored piles on the construction site, allowing managers to remotely monitor the pouring progress of all bored piles, improve the accuracy of over-pouring, and reduce concrete waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a bored pile overfilling monitoring device and a construction diagram provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a first sensor provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of a second sensor provided in an embodiment of the present invention.

[0036] Description of the numbers in the figure:

[0037] 1. First sensor; 2. Second sensor; 3. Cable; 4. Binding belt; 5. Control host; 6. Over-filling traffic light; 7. Grouting pipe; 8. Steel cage; 9. Steel bars; 10. Bottom position of cast-in-place pile; 11. Inner elevation position of cast-in-place pile. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] This embodiment provides a bored pile overfilling monitoring device based on the measured resistivity method.

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, a bored pile overfilling monitoring device based on the measured resistivity method includes a first sensor 1, a second sensor 2, a cable 3, a binding belt 4, a control host 5, and an overfilling traffic light 6.

[0042] The first sensor 1 comprises a first electrode 101 and a first insulating sleeve 12, and is used to measure parameter data of the resistivity of pure concrete at the bottom position 10 of the cast-in-place pile;

[0043] The second sensor 2 comprises a second electrode 201 and a second insulating sleeve 22, and is used for real-time measurement of the resistivity parameter data of the slurry between all the measuring electrodes above and below the elevation position 11 in the cast-in-place pile;

[0044] The control host 5 is connected to the first sensor 1 and the second sensor 2 respectively through the cable 3. The control host 5 determines the resistivity of pure concrete at the bottom of the cast-in-place pile according to the parameter data of the first sensor 1 and the second sensor 2, and calculates the resistivity of the slurry in the cast-in-place pile in real time;

[0045] The control host 5 monitors the pouring process of concrete in the bored pile in real time.

[0046] For example, Figure 1 , Figure 2 As shown, the steel cage 8 is lowered to the bottom position 10 of the cast-in-place pile by a crane, the first electrode 101 of the first sensor 1 includes four electrodes A, M, N, and B, wherein A and B are two power supply electrodes, and M and N are two measuring electrodes. The cable 3 connected to the first sensor 1 is fixed inside the first insulating sleeve 12, and the cable 3 is a multi-core cable. Four taps of the cable 3 are used as four electrodes of the first sensor 1, wherein two of the electrodes are used as two power supply electrodes of the first sensor 1, and the other two electrodes are used as two measuring electrodes of the first sensor 1. The control host 5 determines the resistivity of the concrete at the bottom position 10 of the cast-in-place pile according to the current value between the two power supply electrodes and the voltage between the two measuring electrodes, and the first sensor 1 is fixed to a side that is a distance away from the steel bars 9 in the steel cage 8 and away from the grouting pipe 7 by a binding belt 4.

[0047] The cable 3 and the first electrode 101 connected to the first sensor 1 are fixed to the inner wall of the first insulating sleeve 12, and the cable 3 and the second electrode 201 connected to the second sensor 2 are fixed together to the inner wall of the second insulating sleeve 22. The first sensor 1 and the second sensor 2 are fixed together through the binding belt 4 at a distance from the steel bars 9 in the steel cage 8 and away from the grouting pipe 7, so as to avoid interference of the drilling holes of the steel cage 8 and the grouting pipe 7 with the resistivity measurement of the slurry during the over-pouring monitoring of the bored pile. There is no material limitation for the binding belt 4, as long as the binding belt does not affect the quality of the pile and does not affect the measurement of the resistivity of the concrete during the over-pouring process, and can be tied firmly.

[0048] During the pouring process of the cast-in-place pile, the slurry experiences three states: mud, a mixture of mud and concrete, and pure concrete. The resistivity of the slurry in the three states is recorded as: ρ 泥浆 , 泥浆-混凝土 , 混凝土 During the pouring process, the grout at the bottom of the pile is initially mud without concrete, followed by a mixture of mud and concrete poured from the bottom of the pile through the grouting pipe 7. The concrete accumulates at the bottom of the pile and pushes the mud upward. As the grouting pipe 7 is lifted upward, the concrete gradually accumulates upward from the bottom of the pile and reaches the bottom position 10 of the pile where the first sensor 1 is located. The control host 5 first calculates the resistivity ρ of the displaced mud based on the current value between the two power supply electrodes A and B of the first sensor 1 and the voltage between the two measuring electrodes M and N. 泥浆 The mud continues to be pushed upward by the concrete, exceeding the M electrode of the first sensor 1, and the control host 5 calculates the resistivity ρ of the mixed slurry of the concrete and the mud 泥浆-混凝土 , and from common knowledge, ρ 泥浆 < 泥浆-混凝土 < 混凝土 , so the resistivity of the mixed slurry is 泥浆-混凝土 is a dynamic value that changes from small to large. When the concrete completely displaces the mud beyond the N electrode of the first sensor 1, the control host 5 calculates the resistivity ρ of the pure concrete. 混凝土 At this time, the resistivity value ρ of the pure concrete at the bottom position 10 of the bored pile during the overfilling of the bored pile in the embodiment can be determined. 混凝土 .

[0049] During the pouring process, the pure concrete will accumulate from the bottom of the bored pile through the grouting pipe 7, and the pure concrete will gradually displace the mud originally retained in the bored pile upward. During the displacing process, the pure concrete and the mud will be mixed due to the continuous stirring of the pure concrete and the mud. Therefore, when the slurry in the bored pile reaches the first sensor 1, the control host 5 successively calculates a dynamically changing resistivity value. When the pure concrete completely displaces the mud and the slurry of the mixture of mud and concrete from the bottom and exceeds the N electrode of the first sensor 1, the control host 5 can calculate the resistivity of the pure concrete in the bored pile. Since the purpose of pouring is to fill the entire space of the bored pile from the bottom position 10 of the bored pile to the elevation position 11 inside the bored pile with the pure concrete, and the overall quality parameter of the concrete material used in the same bored pile over-pouring process changes little, the resistivity of the bottom position 10 of the bored pile calculated by the control host 5 based on the parameter data of the first sensor 1 can be used as a comparison reference value of the pure concrete slurry inside the entire bored pile during the over-pouring process.

[0050] like Figure 1 , Figure 3 As shown, the second sensor 2 is fixed by the binding belt 4 at a distance from the steel bar 9 in the steel cage 8 and on a side away from the grouting pipe 7, the second sensor 2 is connected to the first sensor 1 by the cable 3, the first sensor 1 and the second sensor 2 are fixed by the binding belt 4 and kept in the same straight line, and the middle part of the second sensor 2 is located at the elevation position 11 inside the cast-in-place pile, and can also be located slightly below the elevation position 11 inside the cast-in-place pile, to ensure that the second sensor 2 covers the elevation position 11 inside the cast-in-place pile as a whole, and the length of the second sensor 2 below the elevation position 11 inside the cast-in-place pile is not less than the length above the elevation position 11 inside the cast-in-place pile, so as to achieve a better early warning effect. All electrodes of the first sensor 1 and the second sensor 2 are arranged along a straight line and the distance between every two measuring electrodes is equal. It is assumed that the second electrodes 201 of the second sensor 2 have a total of 21, of which 2 are the power supply electrodes and 19 are the measuring electrodes. The 2 power supply electrodes are A1 and B1 respectively. The 19 measuring electrodes are numbered M1 to M2 from bottom to top. 19 The resistivity measured between each two adjacent electrodes is ρ MiMi+1 (i∈[1,18], i is a positive integer), due to ρ 泥浆 < 混凝土 , ρ can be seen in the actual perfusion process MiMi+1 The value of is a value that increases from small to large and stabilizes at ρ 混凝土When the control host 5 calculates that the resistivity value between two adjacent measuring electrodes reaches ρ 混凝土 , indicating that the pure concrete level has reached the Mth i+1 In particular, the elevation position 11 of the cast-in-place pile in Example 1 is located at the upper half of the second sensor 2, that is, the measuring electrode M 10 Below the elevation position 11 in the cast-in-place pile.

[0051] 23 cores are pulled out of the cable 3 connected to the control host 5, of which 2 cores are connected to the 2 power supply electrodes of the first sensor 1 and the 2 power supply electrodes of the second sensor 2. The control host 5 supplies power to the first sensor 1 and the second sensor 2 through the 2 cores of the cable 3, and ensures that the working voltages of the first sensor 1 and the second sensor 2 are consistent; the remaining 21 cores are respectively connected to the 2 measuring electrodes of the first sensor 1 and the 19 measuring electrodes of the second sensor 2. The power supply electrodes and the measuring electrodes of the first sensor 1 and the second sensor 2 are connected to the control host 5 through the cable 3, so as to realize information communication and data transmission between the first sensor 1 and the second sensor 2 and the control host 5.

[0052] The control host 5 calculates the real-time resistivity of each position within the length range of the second sensor according to the parameter data of the second sensor 2, and accurately grasps the position of the upper interface of the pure concrete in the cast-in-place pile according to the resistivity value of the position of each measuring electrode of the second sensor 2, and controls the over-filling traffic light 6 to display lights of different colors. When the over-filling traffic light is green, it means that the upper interface of the pure concrete has not reached the first group of measuring electrodes at the lower end of the second sensor, and the staff continues to perform the pouring work. When the over-filling traffic light is yellow, it means that the upper interface of the pure concrete is close to the elevation position 11 in the cast-in-place pile, and the staff reduces the pouring pressure, thereby slowing down the pouring speed of the concrete. When the over-filling traffic light is red, it means that the upper interface of the pure concrete has reached or even exceeded the elevation position 11 in the cast-in-place pile, and the staff stops the pouring work, thereby achieving the purpose of accurately controlling the over-filling amount.

[0053] The process of monitoring using the above-mentioned bored pile overfilling monitoring device based on the measured resistivity method is as follows:

[0054] The first sensor 1 will go through three stages in sequence: mud, a mixture of mud and concrete, and pure concrete. The control host 5 calculates the resistivity of the slurry in different states based on the voltage between the two measuring electrodes M and N of the first sensor 1 and the current value between the two power supply electrodes A and B. When the control host 5 calculates that the resistivity value between the two measuring electrodes M and N of the first sensor 1 changes from small to large and finally remains unchanged at the maximum value, it means that the liquid level of the pure concrete reaches or even exceeds the N electrode of the first sensor 1, that is, the bottom position 10 of the cast-in-place pile has been completely covered by the pure concrete. At this time, the resistivity calculated by the control host 5 is the true resistivity ρ of the pure concrete. 混凝土 During the concrete pouring process, the control host 5 calculates the resistivity of each measuring electrode of the second sensor 2 in real time. The control host 5 calculates the resistivity ρ between the measuring electrodes according to the current value between the two power supply electrodes of the second sensor 2 and the voltage between the 19 measuring electrodes. MiMi+1 If the control host 5 calculates the resistivity ρ between the measuring electrodes M1 and M2 of the second sensor 2 M1M2 < 混凝土 , it means that the upper interface of the pure concrete has not reached the lowermost end of the second sensor 2, that is, it has not reached the position of the measuring electrode M1, the control host 5 controls the super-filling traffic light 6 connected thereto to display a green light, and the on-site construction personnel continue to pour concrete into the cast-in-place pile at the original speed; if the resistivity ρ between the measuring electrodes M1 and M2 of the second sensor 2 is calculated M1M2 =ρ 混凝土 , and M9, M 10 The resistivity ρ between the measuring electrodes M9M10 < 混凝土 , and the resistivity of the measuring electrode Mj+1 at the same level as the elevation position 11 in the cast-in-place pile is ρMjMj+1<ρ 混凝土 , indicating that the liquid level of the pure concrete slurry reaches the lower half of the second sensor 2, that is, the upper interface of the pure concrete is located between M1 and M2 of the second sensor. 10 The control host 5 controls the overfilling traffic light 6 to display a yellow light, and the on-site construction personnel adjust the pressure to reduce the speed of concrete pouring and continue to pour concrete on the cast-in-place pile; if the M9 and M 10 The resistivity ρ between the measuring electrodes M9M10 =ρ 混凝土 , and the measuring electrode M is flush with the elevation position 11 in the cast-in-place pile i+1 Resistivity ρ at the locationMiMi+1 =ρ 混凝土 , it means that the upper interface of the pure concrete has reached the elevation position 11 inside the cast-in-place pile, the control host 5 controls the over-filling traffic light 6 to display a red light, and the construction personnel immediately stop the concrete pouring operation.

[0055] Embodiment 2

[0056] Based on the first embodiment, the present embodiment uses the device in batches to carry out the pouring construction of multiple bored piles at the same time. Each control host 5 is connected to a client terminal, such as a computer or mobile phone used by a manager. The parameter information of the control host 5 is sent to the manager's terminal. The parameter information includes pouring not started, pouring in progress, approaching elevation, and completed, etc., which enables the manager to monitor multiple bored piles in real time. When connected to a public network or a specially arranged network, the manager can remotely monitor all the bored piles on the entire construction site.

[0057] The present invention fixes all measuring electrodes on the inner wall of the insulating sleeve, and the first sensor and the second sensor are at a distance from the steel cage, so that the interference of the steel cage on the electrical measurement can be avoided; there is no need to calibrate the concrete sample in advance, and the real resistivity value of the current concrete is directly measured at the bottom of the pile by the first sensor, which solves the problem that different batches need to be recalibrated; continuous measuring points with equal spacing are set at a distance below the elevation position of the concrete liquid surface designed for pouring, so that both early warning and accurate control of over-pouring can be achieved; the control host controls the over-pouring red and green light status according to the resistivity value in real time, so as to remind the construction personnel that the green light pours the concrete normally, the yellow light slows down the concrete pouring, and the red light stops the concrete pouring, so as to intuitively and effectively remind the construction personnel to monitor the over-pouring of concrete; the device and the method are applied to all the bored piles in the construction site, so as to realize the remote monitoring of the pouring process, reduce the waste of concrete, and improve the efficiency of the pouring work on the construction site.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A monitoring device for overfilling of cast-in-place piles based on measured resistivity method, characterized in that: The device comprises: a first sensor (1), a first electrode (101), a second sensor (2), a second electrode (201), a cable (3), and a control host (5); The first sensor (1) comprises a first electrode (101) including at least two measuring electrodes separated by a distance, and a first insulating sleeve (12), and is used to measure parameter data of the resistivity of pure concrete at the bottom position (10) of the cast-in-place pile; The second sensor (2) comprises a second electrode (201) including at least two measuring electrodes separated by a distance, and a second insulating sleeve (22), and is used for real-time measurement of resistivity parameter data between all measuring electrodes above and below the elevation position (11) in the cast-in-place pile; The control host (5) is connected to the first sensor (1) and the second sensor (2) respectively via the cable (3); the control host (5) determines the pure concrete resistivity at the bottom position (10) of the cast-in-place pile according to the parameter data of the first sensor (1) and the second sensor (2), and calculates the grout resistivity above and below the elevation position (11) in the cast-in-place pile in real time; The control host (5) monitors the pouring process of concrete in the bored pile in real time.

2. The overfilling monitoring device for cast-in-place piles based on the measured resistivity method according to claim 1, characterized in that: The cable (3) connected to the first sensor (1) is a multi-core cable, and four taps of the cable (3) are used as the first electrodes (101). The first electrodes (101) include two power supply electrodes and two measuring electrodes. The two power supply electrodes are located at two ends of the first sensor (1), and the two measuring electrodes are spaced a distance apart and distributed between the two power supply electrodes of the first electrode (101).

3. A monitoring device for overfilling of cast-in-place piles based on the measured resistivity method according to claim 2, characterized in that: The cable (3) connected to the second sensor (2) is a multi-core cable, and n+2 taps of the cable (3) are used as the second electrodes (201). The second electrodes (201) include two power supply electrodes and n measuring electrodes. The two power supply electrodes are located at two ends of the second sensor (2). The n measuring electrodes are evenly spaced and distributed between the two power supply electrodes of the second electrode (201). The spacing between the n measuring electrodes is the same as the spacing between the two measuring electrodes of the first sensor (1).

4. The overfilling monitoring device for cast-in-place piles based on the measured resistivity method according to claim 1 is characterized in that: The first insulating sleeve (12) and the second insulating sleeve (22) are both hollow structures, the first electrode (101) of the first sensor (1) is placed on the inner wall of the first insulating sleeve (12), the second electrode (201) of the second sensor (2) is placed on the inner wall of the second insulating sleeve (22), and the first sensor (1) and the second sensor (2) are both fixed at a distance from the steel cage (8) and on a side away from the grouting pipe (7).

5. The overfilling monitoring device for cast-in-place piles based on the measured resistivity method according to claim 1 is characterized in that: The device further comprises an overfilled traffic light (6), the overfilled traffic light (6) being connected to the control host (5), the control host (5) comparing the real-time resistivity of each position within the length range of the second sensor with the resistivity of the pure concrete determined at the bottom position (10) of the cast-in-place pile, and controlling the overfilled traffic light (6) to display lights of different colors according to the comparison result.

6. The overfilling monitoring device for bored piles based on the measured resistivity method according to claim 5 is characterized in that: When the overfilling traffic light (6) displays a green light, concrete is poured at a normal speed; when the overfilling traffic light (6) displays a yellow light, the concrete pouring speed is gradually reduced; and when the overfilling traffic light (6) displays a red light, concrete pouring is stopped.

7. The device for monitoring overfilling of a bored pile based on the measured resistivity method according to claim 1, characterized in that: The device is used in batches, and the measured parameter information is notified to the manager in real time, so that the manager can remotely monitor the pouring progress of all the bored piles on the entire construction site.

8. A method for monitoring overfilling of a bored pile based on measured resistivity method according to any one of claims 1 to 7, characterized in that: The method comprises: Determining the resistivity of pure concrete at the bottom position (10) of the cast-in-place pile according to the parameter data measured by the first sensor (1); Real-time measurement of parameter data at each position within the length range of the second sensor (2), and calculation of the resistivity above and below the elevation position (11) within the cast-in-place pile; The resistivity above and below the inner elevation position (11) of the cast-in-place pile is compared with the resistivity of pure concrete determined at the bottom position (10) of the cast-in-place pile; The pouring process of concrete in the cast-in-place pile is monitored in real time.

9. The method of using a bored pile overfilling monitoring device based on measured resistivity method according to claim 8, characterized in that: The control host (5) calculates the resistivity of the slurry in different states based on the voltage between the measuring electrodes of the first sensor (1) and the current value between the power supply electrodes. When the resistivity value between the measuring electrodes calculated by the control host (5) changes from small to large and finally remains unchanged at the maximum value, it means that the bottom position (10) of the cast-in-place pile has been completely covered by the pure concrete. At this time, the resistivity calculated by the control host (5) is the real resistivity ρ of the pure concrete. 混凝土 ; During the concrete pouring process, the control host (5) calculates in real time the resistivity of each measuring electrode of the second sensor (2) at a location where the measuring electrodes are located, and calculates the resistivity ρ between the measuring electrodes based on the current value between the power supply electrodes of the second sensor 2 and the voltage between the measuring electrodes. MiMi+1 , if the control host (5) calculates the resistivity ρ between the two measuring electrodes at the bottom of the second sensor (2) M1M2 < 混凝土 , it means that the upper interface of the pure concrete has not yet reached the lowest end of the second sensor (2); if the resistivity ρ between the two measuring electrodes at the lowest end of the second sensor (2) is calculated M1M2 =ρ 混凝土 , and the measuring electrode M is flush with the elevation position (11) inside the cast-in-place pile j+1 Resistivity ρ at the location MjMj+1 < 混凝土 , indicating that the liquid level of the pure concrete slurry has reached the lower half of the second sensor (2); if the measuring electrode M of the second sensor (2) is flush with the elevation position (11) inside the cast-in-place pile j+1 Resistivity ρ at the location MjMj+1 =ρ 混凝土 , it means that the upper interface of the pure concrete has reached the inner elevation position (11) of the cast-in-place pile.

10. The method of using a bored pile overfilling monitoring device based on measured resistivity method according to claim 8, characterized in that: Based on the comparison result, the distance between the upper interface of the concrete and the elevation position (11) inside the cast-in-place pile is determined, and the over-casting traffic light (6) is controlled to display different colors.

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