A system and method for sediment thickness measurement

Abstract

The application discloses a system and method for sediment thickness measurement, the system comprises a probe body, a probe driving device, a probe assembly, a limiting float, a magnetic attraction switch assembly, a posture detection device and a control device, the probe driving device controls the probe body to be lowered into a building with sediment, the relative movement of the limiting float makes the magnetic attraction switch assembly generate a disconnection signal and send the signal to the control device, when the control device receives the disconnection signal, it determines that the measurement starts, at the same time, the probe in the probe assembly enters the sediment, and the posture detection device sends a position signal, according to the position signal, the measurement ends, and according to the distance of the probe advancing from the start of the measurement to the end of the measurement, the sediment thickness is calculated, the system does not need to configure a pressure sensor or a resistivity detection circuit on the probe, and the problems caused by mechanical structures and electrical connections are excluded, the system complexity is effectively reduced, and the production cost is reduced and the measurement reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sediment thickness measurement, and particularly relates to a system and method for sediment thickness measurement. BACKGROUND

[0002] Sediment, also known as virtual soil, drilling sludge, etc., is a certain thickness of relatively soft material formed at the bottom of the pile before the final hole and concrete pouring. It is often the gravel, quicksand, etc. dropped during the drilling process. During the process of lowering the reinforcement cage, new sediment may also appear due to hole collapse, sedimentation, etc. If the sediment is not cleaned, part of the sediment will be buried at the bottom of the hole after the concrete is poured, and part of the sediment will be overturned by the concrete and pressed all the way to the top of the pile to form floating slurry after the hole is poured.

[0003] Before the sediment in the cast-in-place pile is cleaned, the thickness of the sediment needs to be measured. The currently commonly used sediment thickness detection methods mainly include pressure probes and resistivity probes, which are respectively based on the sensing of pressure or resistivity changes and are realized by accurate analog sensing.

[0004] For example, patent document CN111042225A discloses a device for accurately measuring the sediment thickness of a cast-in-place pile, which includes an upper computer located on the ground and a sediment probe located in the pile and connected to the upper computer by a cable. The sediment probe includes a shell and a bottom plate. The shell has an upper sealing member, a circuit board, a motor, a mechanical probe, and a lower sealing member arranged in the shell from top to bottom. The mechanical probe extends outward through the lower sealing member and the bottom plate. The bottom surface of the bottom plate is uniformly provided with at least four first pressure sensors. The end of the mechanical probe is provided with a second pressure sensor for recording the real-time pressure value when entering the sediment layer to the bottom of the sediment layer. An angle sensor is also arranged on the body of the mechanical probe for measuring the inclination angle thereof. The first pressure sensor, the second pressure sensor, and the angle sensor are electrically connected to the circuit board and the upper computer. The bottom plate is provided with a weight adjusting device and / or an area adjusting device which can be adjusted in real time. However, the scheme has the following problems: first, the pressure sensor is arranged at the end of the probe. Considering that the sediment thickness measurement is often carried out in a muddy water environment, and the internal space of the probe is very small, such installation requirements and wiring will encounter great obstacles; second, the setting of the pressure sensor at the end of the probe needs to be directly contacted with the mud during use, which brings great challenges to the waterproofness and service life of the pressure sensor. Similarly, the sediment thickness measurement method based on the resistivity probe needs to configure a resistivity detection circuit on the probe, which makes the structure of the entire measurement system complex, the installation requirements high, and the wiring encounters great obstacles. SUMMARY

[0005] The application provides a system and method for sediment thickness measurement, which effectively reduces the system complexity without setting pressure sensor or resistivity detection circuit.

[0006] A system for sediment thickness measurement, comprising a probe body, a probe driving device, a probe assembly, a limit float, a magnetic attraction switch assembly, a posture detection device and a control device, the limit float is arranged at the bottom of the probe body, the magnetic attraction switch assembly is arranged in cooperation with the limit float and the probe body, the probe assembly is arranged in cooperation with the probe body, and the probe assembly comprises a probe.

[0007] The probe driving device is used for controlling the probe body to be lowered into a building body with sediment, the relative movement of the limit float makes the magnetic attraction switch assembly generate a disconnection signal and send it to the control device, the control device determines the start of measurement when receiving the disconnection signal, controls the probe in the probe assembly to enter the sediment, receives the posture signal sent by the posture detection device, determines the end of measurement according to the posture signal, and calculates the sediment thickness according to the distance of the probe advancing from the start of measurement to the end of measurement.

[0008] Further, the posture detection device comprises a three-dimensional posture sensor, and the posture detection device is arranged at the top of the probe body.

[0009] Further, the magnetic attraction switch assembly comprises a magnet and a magnetic switch sensor, the magnet is arranged on the side wall of the limit float, the magnetic switch sensor is arranged on the inner wall of the probe body, and in a non-measurement state, the magnet and the magnetic switch sensor are attached, when the limit float and the probe body produce relative movement, the magnet and the magnetic switch sensor are separated, the magnetic switch sensor generates a disconnection signal and sends it to the control device.

[0010] Further, the bottom of the probe body is provided with a cavity for accommodating the limit float, the limit float is a columnar structure with one end open and the other end closed, the open end of the limit float extends outwardly with a step, the center axis of the limit float is collinear with the center axis of the probe body, the limit float can relatively move along the axial direction of the probe body by a preset distance, and the probe assembly is partially arranged in the limit float.

[0011] Further, the control device receives the posture signal, judges the inclination angle of the probe body according to the posture signal, generates a stop signal to control the probe in the probe assembly to stop advancing when the inclination angle reaches a preset threshold, and determines the end of measurement according to the change curve of the inclination angle.

[0012] Further, the probe assembly comprises a probe and a probe driving device, the probe and the probe driving device are cooperatively arranged, a through hole is arranged at the center of one end of the limiting float, one end of the probe is arranged in the probe body through the through hole, and the other end is used for entering the sediment; and the probe driving device is arranged in the limiting float.

[0013] Further, the probe driving device comprises a motor.

[0014] The control device calculates the distance of the probe advancing according to the rotation amount of the motor from the start of measurement to the end of measurement, and obtains the thickness of the sediment.

[0015] A sediment thickness measurement method using the above system, comprising:

[0016] The probe driving device controls the probe body to be lowered into the building body with the sediment;

[0017] The control device detects whether the disconnection signal sent by the magnetic attraction switch assembly is received in real time, and determines that the measurement starts when the disconnection signal is received.

[0018] The control device controls the probe in the probe assembly to enter the sediment, and receives the posture signal sent by the posture detection device;

[0019] The control device determines the end of measurement according to the posture signal, and calculates the thickness of the sediment according to the distance of the probe advancing from the start of measurement to the end of measurement.

[0020] Further, the control device determines the end of measurement according to the posture signal, comprising:

[0021] According to the posture signal, the inclination angle of the probe body is judged, when the inclination angle reaches a preset threshold, a stop signal is generated to control the probe in the probe assembly to stop advancing, and the end of measurement is determined according to the change curve of the inclination angle.

[0022] Further, the probe assembly further comprises a probe driving device, and the probe driving device comprises a motor.

[0023] The thickness of the sediment is calculated according to the distance of the probe advancing from the start of measurement to the end of measurement, comprising:

[0024] The control device calculates the distance of the probe advancing according to the rotation amount of the motor from the start of measurement to the end of measurement, and obtains the thickness of the sediment.

[0025] The system and method for measuring the thickness of the sediment provided by the application at least have the following beneficial effects:

[0026] (1) through the magnetic attraction switch assembly, limit floating disc, attitude detection device and the overall cooperation of the probe body, the measurement of sediment thickness is realized, without the need to configure pressure sensor or resistivity detection circuit on the probe, the problems brought by mechanical structure and electrical connection are excluded, the system complexity is effectively reduced, and the production cost is reduced and the measurement reliability is improved;

[0027] (2) the magnetic attraction switch assembly and the attitude detection device can be arranged in the probe body, on the one hand, the internal wiring is facilitated, on the other hand, the electronic device does not need to contact the sediment, and the waterproof component for the electronic device is not needed, and the production cost is further reduced;

[0028] (3) the measurement start of the probe starting to contact the sediment and the measurement end of the probe reaching the bottom of the building body are determined by a full digital approach, the problem of determining and configuring the comparison threshold value of the analog quantity (pressure sensor or resistivity detection circuit) detection method is avoided, the reliability of the detection process is improved, and the certainty and credibility of the detection result are increased. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The result diagram of one embodiment of the system for sediment thickness measurement provided by the application.

[0030] Figure 2 The schematic diagram of one embodiment of the measurement process of the system for sediment thickness measurement provided by the application.

[0031] Figure 3 The control block diagram of one embodiment of the system for sediment thickness measurement provided by the application.

[0032] Figure 4 The result diagram of one embodiment of the system for sediment thickness measurement provided by the application through the inclination angle to determine the measurement end.

[0033] Figure 5 The flowchart of one embodiment of the method for sediment thickness measurement provided by the application. DETAILED DESCRIPTION

[0034] In order to better understand the above technical solutions, the above technical solutions will be described in detail in combination with the drawings of the specification and specific embodiments.

[0035] REFERENCE Figures 1 to 3In some embodiments, a system for sediment thickness measurement is provided, comprising a probe body 1, a probe driving device 2, a probe assembly 3, a limit float 4, a magnetic attraction switch assembly 5, a posture detection device 6, and a control device 7. The limit float 4 is arranged at the bottom of the probe body 1. The magnetic attraction switch assembly 5 is arranged in cooperation with the limit float 4 and the probe body 1. The probe assembly 3 is arranged in cooperation with the probe body 1. The probe assembly 3 comprises a probe 31.

[0036] The probe driving device 2 is used to control the probe body 1 to be lowered into a building body with sediment. The relative movement of the limit float 4 causes the magnetic attraction switch assembly 5 to generate an open signal sent to the control device 7. When the control device 7 receives the open signal, it determines that the measurement starts. At the same time, the control device 7 controls the probe in the probe assembly to enter the sediment and receives the posture signal sent by the posture detection device 6. According to the posture signal, the control device 7 determines that the measurement ends. According to the distance of the probe advancing from the start of the measurement to the end of the measurement, the control device 7 calculates the sediment thickness.

[0037] The building body with sediment can be a cast-in-place pile.

[0038] Specifically, the probe driving device 2 is connected with the probe body 1 in cooperation and is used to drive the probe body 1 to be lowered into the cast-in-place pile or to lift the probe body 1 lowered into the cast-in-place pile. The limit float 4 is installed at the bottom of the probe body 1 and can produce relative movement in the axial direction within a preset distance with the probe body 1. The magnetic attraction switch assembly 5 is arranged in cooperation with the limit float 4 and the probe body 1. The magnetic attraction switch assembly 5 can sense the relative movement of the probe body 1 and the limit float 4. The probe assembly 3 is arranged in cooperation with the probe body 1. The probe in the probe assembly 3 can extend into the sediment. The posture detection device 6 detects the inclination angle of the probe body 1 in real time. The posture detection device 6 and the magnetic attraction switch assembly 5 are connected with the control device 7.

[0039] The probe driving device 2 can include a corresponding screw mechanism of a motor to drive the probe body 1 to be lowered into a building body with sediment, such as a cast-in-place pile, during measurement, when the sediment surface is reached, the limiting float 4 is upwardly moved relative to the probe body 1 due to the blockage of the sediment surface, and the magnetic attraction switch assembly 5 generates a disconnection signal during the movement and sends the signal to the control device, when the control device receives the disconnection signal, it indicates that the limiting float 4 has reached the sediment surface at this time, and therefore records the time when the disconnection signal is received as the start of measurement, and controls the probe in the probe assembly 3 to advance to the deep sediment, when the probe contacts the hard bottom of the cast-in-place pile, further advancement will cause the probe body 1 to tilt as a whole, and the attitude detection device 6 detects the tilt angle of the probe body 1 in real time, and determines the end of measurement according to the tilt angle: when the tilt angle reaches a preset threshold, the end of measurement is determined according to the change curve of the tilt angle, that is, the time when the probe reaches the bottom of the pile, and the thickness of the sediment is calculated according to the distance of the probe advancement from the start of measurement to the end of measurement.

[0040] The system provided by the above embodiment can accurately sense whether the probe body reaches the sediment surface through the cooperation and linkage of the magnetic attraction switch assembly and the limiting float, thereby recording the start of measurement and controlling the probe to start advancing downward, detecting the tilt angle of the probe body through the attitude detection device, determining the end of measurement, that is, the time when the probe reaches the bottom of the pile, and calculating the thickness of the sediment according to the distance of the probe advancement from the start of measurement to the end of measurement. Without configuring a pressure sensor or a resistivity detection circuit on the probe, the problems in mechanical structure and electrical connection are eliminated, the system complexity is effectively reduced, and the production cost is reduced and the measurement reliability is improved.

[0041] Further, the attitude detection device 6 includes but is not limited to a three-dimensional attitude sensor, and as an optional embodiment, the attitude detection device 6 is arranged at the top of the probe body 1.

[0042] Specifically, the attitude detection device 6 detects the pose signal of the probe body 1 in real time and sends it to the control device 7, and the control device 7 calculates the tilt angle of the probe body 1 according to the pose signal, and the probe body 1 should maintain a vertical attitude without tilting during the lowering process of the probe body 1 and the advancement process of the probe, when the probe reaches the hard bottom of the cast-in-place pile, further lowering will cause the probe body to tilt as a whole, and the time when the probe reaches the bottom of the cast-in-place pile can be obtained through the change of the tilt angle, thereby determining the end of measurement.

[0043] Further, the magnetic attraction switch assembly 5 comprises a magnet 51 and a magnetic switch sensor 52, the magnet 51 is arranged on the side wall of the limiting float 4, the magnetic switch sensor 52 is arranged on the inner wall of the probe body 1, the magnetic switch sensor 52 is connected with the control device 7, and in the non-measuring state, the magnet 51 is attached to the magnetic switch sensor 752, when the limiting float 4 and the probe body 1 produce relative movement, the magnet 51 and the magnetic switch sensor 52 are separated, the magnetic switch sensor 52 generates a disconnection signal and sends it to the control device 7.

[0044] Specifically, the magnet 51 and the magnetic switch sensor 52 are oppositely arranged and attached to each other in the non-measuring state, the magnetic switch sensor 52 senses the magnetic signal of the magnet 51 in real time, when the limiting float 4 reaches the upper surface of the sediment, the limiting float 4 is blocked by the upper surface of the sediment and produces relative movement with the probe body 1, which causes the magnet 51 and the magnetic switch sensor 52 to be separated during the movement, at this time the magnetic switch sensor 52 cannot sense the magnetic signal of the magnet 51, thereby generating a disconnection signal and sending it to the control device 7, the control device 7 can determine that the magnetic switch sensor 52 and the magnet 51 have been disconnected at this time according to the disconnection signal, that is, the limiting float has reached the sediment surface, and the time when the disconnection signal is received is determined as the start of measurement and is recorded.

[0045] Further, the bottom of the probe body 1 is provided with a cavity for accommodating the limiting float 4, the limiting float 4 is a columnar structure with one end open and the other end closed, the open end of the limiting float 4 extends outwardly with a step 41, the center axis of the limiting float 4 is collinear with the center axis of the probe body 1, the limiting float 4 can move relative to the probe body 1 by a preset distance in the axial direction of the probe body 1, and the probe assembly 3 is partially arranged in the limiting float 4.

[0046] Specifically, the magnet 51 is arranged on the outer wall of the columnar structure part of the limiting float 4, the magnetic switch sensor 52 is arranged on the inner wall of the probe body 1, the center axis of the limiting float 4 is collinear with the center axis of the probe body 1, when the limiting float 4 moves relative to the probe body 1, the center axis of the limiting float 4 and the center axis of the probe body 1 still remain collinear, the open end of the limiting float 4 extends outwardly with a step, when the limiting float 4 reaches the sediment surface, the sediment has a certain supporting effect on the step 41 of the limiting float 4, the limiting float 4 moves upward relative to the probe body 1, and the probe body 1 falls on the step of the limiting float 4, at this time the control device receives the disconnection signal and controls the probe to extend into the sediment, and at the same time controls the probe driving device 1 to stop driving so that the probe body 1 is stationary.

[0047] Further, when the probe starts to enter the sediment under the pushing of the driving device thereof, the control device 7 receives the pose signal sent by the pose detection device in real time, judges the tilt angle of the probe body 1 according to the pose signal, generates a stop signal to control the probe in the probe assembly to stop advancing when the tilt angle reaches a preset threshold, and determines the end of measurement according to the change curve of the tilt angle.

[0048] In actual application, slight shaking of the probe body may occur during the descending process, and such slight shaking is captured by the pose detection device and is shown as oscillation of the tilt angle in a small range at the initial stage of the descending process of the probe body.

[0049] Therefore, in some embodiments, the control device 7 receives the pose signal sent by the pose detection device according to a preset sampling period, judges the tilt angle of the probe body 1 according to the pose signal, and obtains the change curve of the tilt angle by curve fitting according to the tilt angle, and determines the end of measurement according to the change curve of the tilt angle, which can be determined as the end of measurement when the tilt angle starts to rise regularly.

[0050] Reference Figure 4 , the abscissa is the distance of the probe advancement, the ordinate is the tilt angle, the curve a is the change curve of the tilt angle obtained by fitting, and a g is a preset threshold, and the probe stops advancing when the tilt angle reaches the preset threshold. In some embodiments, the least square method can be used to fit the tilt angle in the figure to obtain the change curve of the tilt angle, and then the end of measurement can be determined when the tilt angle starts to rise regularly, for example, h2 in the figure.

[0051] Further, the probe assembly 3 includes a probe 31 and a probe driving device 32, the probe and the probe driving device 32 are cooperatively arranged, and the probe driving device 32 is connected with the control device 7. A through hole is arranged at the center of the closed end of the limiting float 4, one end of the probe 31 passes through the through hole and is arranged in the probe body 1, and the other end is used to enter the sediment, and the probe driving device 32 is arranged in the limiting float 4.

[0052] In some embodiments, the probe driving device 32 is fixed to the inner wall of the probe body, and the probe driving device 32 is arranged in the limiting float 4, and the probe driving device 32 has a certain limiting effect on the limiting float 4, so that the limiting float 4 will not be separated from the probe body 1.

[0053] Specifically, the probe driving device 32 is used to drive the probe 31 to extend out of the probe body 1 or to reset the probe 31 into the probe body 1. During measurement, when the control device 7 receives the disconnection signal and records the starting time of measurement, the probe driving device 32 is controlled to drive the probe 31 to advance into the sediment. After the measurement is completed, the probe driving device 32 is controlled to drive the probe to reset into the probe body 1.

[0054] In some embodiments, the probe driving device 2 includes a motor, and the rotation of the motor and the advancing distance of the probe have a corresponding relationship. Therefore, the control device 7 calculates the distance of the probe advancing according to the rotation amount of the motor from the start of measurement to the end of measurement, so as to obtain the sediment thickness.

[0055] In summary, the above-mentioned embodiments provide a cast-in-place pile sediment thickness measurement system, and the working principle is as follows:

[0056] Before the measurement starts, the probe driving device 2 drives the probe body 1 to lower into the cast-in-place pile, and the control device 7 detects in real time whether the disconnection signal sent by the magnetic attraction switch assembly 5 is received. When the disconnection signal is received, it indicates that the limiting floating plate 4 has reached the sediment surface at this time, the limiting floating plate 4 moves relative to the probe body 1 to make the magnet 51 arranged on the limiting floating plate 4 disconnected with the magnetic switch sensor 52 arranged on the inner wall of the probe body 1, and the measurement is determined to start. At the same time, the probe driving device 32 is controlled to drive the probe 31 to advance into the sediment. When the probe 31 reaches the bottom of the cast-in-place pile, the probe body 1 will be tilted as a whole if the probe 31 continues to advance. The control device 7 receives the posture signal sent by the posture detection device in real time, judges the inclination angle of the probe body 1 according to the posture signal, generates a stop signal to control the probe driving device 32 to stop driving when the inclination angle reaches a preset threshold, so that the probe 31 stops advancing. The control device 7 determines the end of measurement according to the change curve of the inclination angle, and obtains the sediment thickness according to the distance of the probe advancing from the start of measurement to the end of measurement. Then, the control device controls the probe driving device 2 to drive the probe body 1 to lift from the cast-in-place pile, and drives the probe to reset through the probe driving device, and the measurement is completed.

[0057] The system for measuring sediment thickness provided by the above-mentioned embodiments has at least the following beneficial effects:

[0058] (1) Through the cooperation of the magnetic attraction switch assembly, the limiting floating plate, the posture detection device, and the probe body, the measurement of the sediment thickness is realized. Without configuring a pressure sensor or a resistivity detection circuit on the probe, the problems in mechanical structure and electrical connection are eliminated, the system complexity is effectively reduced, and the production cost is reduced and the measurement reliability is improved.

[0059] (2) The magnetic attraction switch assembly and the posture detection device can be arranged inside the probe body, which is convenient for internal wiring and avoids the need for waterproof components for the electronic devices, thereby further reducing production costs;

[0060] (3) The measurement start of the probe contacting the sediment and the measurement end of the probe reaching the bottom of the cast-in-place pile are determined by a fully digital approach, which avoids the need to determine and configure a comparison threshold value in the analog (pressure sensor or resistivity detection circuit) detection method, thereby improving the reliability of the detection process and increasing the certainty and credibility of the detection results.

[0061] Reference Figure 5 In some embodiments, a sediment thickness measurement method using the above system is provided, comprising:

[0062] S1, the probe driving device controls the probe body to be lowered into a building with sediment;

[0063] S2, the control device detects in real time whether a disconnection signal sent by the magnetic attraction switch assembly is received, and determines the measurement start when the disconnection signal is received;

[0064] S3, the control device controls the probe in the probe assembly to enter the sediment while receiving the pose signal sent by the posture detection device;

[0065] S4, the control device determines the measurement end according to the pose signal and calculates the sediment thickness according to the distance of the probe advancing from the measurement start to the measurement end.

[0066] Specifically, in step S1, at the measurement start, the control device generates a lowering control signal and sends it to the probe driving device, and the probe driving device controls the probe body to be lowered into the cast-in-place pile according to the lowering control signal, wherein the probe driving device can include a corresponding screw mechanism of the motor.

[0067] Further, in step S2, during the lowering of the probe body, the control device detects in real time whether a disconnection signal sent by the magnetic attraction switch assembly is received, and when the surface of the sediment is reached, the upward movement of the limiting float relative to the probe body occurs due to the blockage of the sediment surface. During the movement, the magnetic attraction switch assembly generates a disconnection signal and sends it to the control device. When the control device receives the disconnection signal, it indicates that the limiting float has reached the surface of the sediment at this time, and therefore records the time when the disconnection signal is received as the measurement start.

[0068] Further, in step S3, the control device receives the disconnection signal at the same time, controls the probe in the probe assembly to advance into the sediment, and receives the pose signal sent by the posture detection device during this process.

[0069] Further, when the probe contacts the hard pile bottom in the pile, the further advancement in step S4 will cause the probe body to tilt as a whole, the control device calculates the tilt angle of the detection probe body according to the pose signal sent by the pose detection device, and determines the measurement end according to the tilt angle, that is, the time when the probe reaches the pile bottom. Wherein, the control device determines the measurement end time according to the pose signal, including:

[0070] According to the pose signal, the tilt angle of the probe body is determined, and when the tilt angle reaches a preset threshold, a stop signal is generated to control the probe in the probe assembly to stop advancing, and the measurement end is determined according to the change curve of the tilt angle.

[0071] In some embodiments, the control device receives the pose signal sent by the pose detection device according to a preset sampling period, determines the tilt angle of the probe body according to the pose signal, and performs curve fitting according to the tilt angle, for example, least squares method can be used for curve fitting to obtain the change curve of the tilt angle, and the measurement end is determined according to the change curve of the tilt angle. When the tilt angle starts to rise regularly, the measurement end is determined.

[0072] Further, the probe assembly further comprises a probe driving device, and the probe driving device comprises a motor;

[0073] The distance of the probe advancing from the start of the measurement to the end of the measurement is calculated to obtain the thickness of the sediment, including:

[0074] The control device calculates the distance of the probe advancing from the start of the measurement to the end of the measurement according to the rotation amount of the motor to obtain the thickness of the sediment.

[0075] The specific working principle can refer to the system embodiment, which will not be described here.

[0076] The above-mentioned embodiment provides a cast-in-place pile sediment thickness measurement method, which has at least the following beneficial effects:

[0077] (1) Through the cooperation of the magnetic attraction switch assembly, the limiting floating disc, the pose detection device and the probe body, the measurement of the sediment thickness is realized, without the need to configure a pressure sensor or a resistivity detection circuit on the probe, which eliminates the difficulties brought by mechanical structure and electrical connection, effectively reduces the system complexity, and further reduces the production cost and improves the measurement reliability;

[0078] (2) The magnetic attraction switch assembly and the pose detection device can be arranged inside the probe body, on the one hand, the internal wiring is convenient, and on the other hand, the electronic device does not need to contact the sediment, and the waterproof component for the electronic device is not needed, further reducing the production cost;

[0079] (3) The starting time of the probe contacting the sediment and the ending time of the probe reaching the bottom of the cast-in-place pile are determined by a full digital approach, which avoids the problem of determining and configuring a comparison threshold value in the analog quantity (pressure sensor or resistivity detection circuit) detection method, improves the reliability of the detection process, and increases the certainty and reliability of the detection results.

[0080] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to encompass within their scope all possible variations and modifications of the preferred embodiments. It is apparent that those skilled in the art can, without departing from the spirit and scope of the application, make various changes and modifications of the application. Thus, if these modifications and variations do not depart from the scope of the application, they are intended to be included within the spirit and scope of the application.

Claims

1. A system for measuring sediment thickness, characterized in that, The device includes a probe body, a probe drive device, a probe assembly, a limiting float, a magnetic switch assembly, an attitude detection device, and a control device. The limiting float is disposed at the bottom of the probe body. The magnetic switch assembly is configured to cooperate with the limiting float and the probe body. The probe assembly is configured to cooperate with the probe body and includes a probe. The probe driving device controls the lowering of the probe body into the building containing sediment. The relative movement of the limiting float causes the magnetic switch assembly to generate an open signal, which is sent to the control device. Upon receiving the open signal, the control device determines the start of the measurement and simultaneously controls the probe in the probe assembly to enter the sediment. It also receives a pose signal from the attitude detection device and determines the tilt angle of the probe body based on the pose signal. When the tilt angle reaches a preset threshold, a stop signal is generated to stop the probe in the probe assembly from advancing. Curve fitting is performed based on the tilt angle to obtain a curve showing the change in tilt angle. The measurement ends when the tilt angle begins to rise regularly, according to this curve. The sediment thickness is calculated based on the distance the probe advances from the start to the end of the measurement. The magnetic switch assembly includes a magnet and a magnetic switch sensor. The magnet is disposed on the side wall of the limiting float, and the magnetic switch sensor is disposed on the inner wall of the probe body. In the non-measuring state, the magnet and the magnetic switch sensor are in contact. When the limiting float and the probe body move relative to each other, the magnet and the magnetic switch sensor separate, and the magnetic switch sensor generates a disconnect signal and sends it to the control device. The bottom of the probe body is provided with a cavity for accommodating the limiting float. The limiting float is a columnar structure with one end open and the other end closed. One end of the limiting float extends outward with a step. The central axis of the limiting float is collinear with the central axis of the probe body. The limiting float can move relative to the probe body along the axial direction of a preset distance. The probe assembly is partially disposed inside the limiting float. The probe assembly also includes a probe driving device. The probe and the probe driving device are configured to work together. A through hole is provided at the center of one closed end of the limiting float. One end of the probe passes through the through hole and is placed in the probe body, while the other end is used to enter the sediment. The probe driving device is disposed inside the limiting float and is fixed to the inner wall of the probe body.

2. The system according to claim 1, characterized in that, The attitude detection device includes a three-dimensional attitude sensor, which is disposed at the top of the probe body.

3. The system according to claim 1, characterized in that, The probe driving device includes a motor; The control device calculates the probe advance distance based on the amount of rotation of the motor from the start to the end of the measurement, and obtains the sediment thickness.

4. A method for measuring sediment thickness using the system described in any one of claims 1-3, characterized in that, include: The probe drive device controls the probe body to be lowered into the building body containing sediment; The control device detects in real time whether it receives a disconnect signal from the magnetic switch assembly. When the disconnect signal is received, the measurement is started. The control device controls the probe in the probe assembly to enter the sediment, and at the same time receives the pose signal sent by the attitude detection device; The control device determines the end of the measurement based on the position signal and calculates the sediment thickness based on the distance the probe advances from the start to the end of the measurement. The control device receives the pose signal sent by the attitude detection device according to the preset sampling period, determines the tilt angle of the probe body according to the pose signal, and performs curve fitting based on the tilt angle to obtain the tilt angle change curve. Based on the tilt angle change curve, the measurement ends when the tilt angle just begins to rise regularly.

5. The method according to claim 4, characterized in that, The control device determines the end of the measurement based on the pose signal, including: The tilt angle of the probe body is determined based on the pose signal. When the tilt angle reaches a preset threshold, a stop signal is generated to control the probe in the probe assembly to stop advancing. The measurement ends based on the change curve of the tilt angle.

6. The method according to claim 4, characterized in that, The probe assembly also includes a probe driving device, which includes a motor; The thickness of the sediment is calculated based on the distance the probe travels from the start to the end of the measurement, including: The control device calculates the probe advance distance based on the amount of rotation of the motor from the start to the end of the measurement, and obtains the sediment thickness.

Images