CN118390484A - Single probe rod integrated data acquisition device and use method - Google Patents

Abstract

The invention discloses a single-probe integrated data acquisition device and a use method, belonging to the technical field of geotechnical material testing instruments; the device realizes the integration of penetration test and pressure gauge test and can collect data in real time; the technical scheme is as follows: the device comprises a probe, a probe rod, a pressure gauge and a ground control device, the probe, the probe rod and the pressure gauge are provided with a detection device, the measured signal is transmitted to a CPT wireless data acquisition instrument through a signal transmission module, and the test progress and test data can be controlled in real time by using a touch control screen; the beneficial effects of the invention are as follows: real-time data collection is realized, and on-site operation is convenient; at the same time, the integration of penetration test and pressure gauge test is realized, which greatly saves the time of soil exploration in engineering.

Description

Single probe rod integrated data acquisition device and use method

Technical Field

The present invention relates to the technical field of geotechnical material testing instruments, and in particular to a single-probe integrated data acquisition device and a use method thereof.

Background technique

With the acceleration of infrastructure construction and urbanization in my country, some large projects and high-rise buildings are increasing day by day. It is extremely important to provide accurate and reliable survey work on the physical and mechanical parameters of foundation rock and soil. The pressure test is an in-situ horizontal load test. Its principle is to use an expandable circular pressure gauge in the borehole to pressurize it in the vertical borehole. The expansion of the pressure gauge deforms the soft rock of the hole wall, thereby determining the stress-strain characteristics of the soil. The static penetration test is to press the conical probe into the soil at a certain rate at a constant speed under static pressure, and measure its penetration resistance (including cone tip resistance and side wall friction resistance or friction resistance ratio). It can determine the deformation modulus, allowable bearing capacity and other mechanical properties of the soil, and divide the soil layer according to the size of the resistance it encounters.

The existing pressure drop tests are divided into three types: pre-drilling, self-drilling, and pressure-insertion. The pre-drilling pressure drop test requires pre-drilling to relieve the natural stress in the soil layer of the hole wall. In addition, the borehole diameter and the outer diameter of the pressure drop tester are difficult to effectively match, and the disturbance of the soil layer is inevitable, making the test effect less than ideal. The pressure drop test has a soil squeezing effect on the surrounding area during the pressure drop process, which has a certain impact on the test results. Although the self-drilling pressure drop test does not require pre-drilling, the equipment is complex and bulky, and the test cost is also high, which limits its application. Although the static penetration test is a continuous, fast and accurate exploration method, it is often necessary to combine it with the pressure drop test in engineering to determine the engineering properties of the soil. It is time-consuming and labor-intensive to conduct these two tests at the actual exploration site.

How to solve the above technical problems is the subject faced by the present invention.

Summary of the invention

In order to solve the above problems, the present invention proposes a single-probe integrated data acquisition device and a method of use, which can be regarded as a combination of a lateral pressure test and a static penetration test. The structural principle is to install a lateral pressure test device behind the static penetration probe, and the diameter of the lateral pressure device is the same as the diameter of the probe. During the normal static penetration test, a lateral pressure test can also be carried out simultaneously. When the probe reaches the intended depth, as in the lateral pressure test, pressure is applied to expand the lateral pressure membrane of the lateral pressure device, and the relationship between the applied pressure and the deformation of the surrounding soil is tested, thereby evaluating the bearing capacity, deformation and other properties of the soil measured around the hole. The single-probe integrated data acquisition device can perform static penetration and lateral pressure tests at the same time, and the data provided include: cone head resistance, side wall friction, pore water pressure, shear wave velocity, consolidation coefficient and lateral pressure curve, etc. This device can also convert the detection signal in real time through the AD conversion module. The penetration test data and the lateral pressure test data are transmitted to the CPT wireless collector in real time through the LORA wireless data transceiver module and the lateral pressure LORA wireless loading controller respectively. The computer acquisition and analysis software is used to realize the real-time acquisition of the penetration and lateral pressure test data, which greatly saves the time cost of soil exploration in the project and accurately obtains the engineering properties of the soil.

To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a single-probe integrated data acquisition device, the device includes a probe, a probe, a pressure gauge, and a ground control device.

The front end of the probe is a cone head, above which is installed a pore pressure sensor for detecting pore water pressure, and inside the friction sleeve I above the pore pressure sensor are symmetrically installed a cone tip sensor for detecting cone tip resistance and a side wall sensor for detecting side friction resistance.

Furthermore, the signals measured by the cone tip sensor, pore pressure sensor, side wall sensor and dual-axis inclination sensor will be converted by 24-bit, 5-channel AD by the AD conversion module I in the probe rod, and then transmitted to the LORA wireless data transceiver module, which transmits the collected signals to the CPT wireless collector. The cone head resistance, side wall friction, pore water pressure and probe rod acceleration are monitored in real time using computer acquisition and analysis software.

The probe rod is equipped with a signal acquisition device for sending and receiving signals, a dual-axis inclination sensor for measuring the acceleration of the probe rod, and a 3-channel acceleration sensor for measuring the shear wave velocity of the probe rod.

Furthermore, the signal measured by the 3-channel acceleration sensor will be converted into 24 bits and 3 channels by the AD conversion module I in the probe rod, and then transmitted to the LORA wireless data transceiver module, which will transmit the collected signal to the surface CPT wireless collector and use computer collection and analysis software to monitor the shear wave velocity of the probe rod in real time.

The signal acquisition device includes an AD conversion module I and a LORA wireless data transceiver module.

Furthermore, the sensor is connected to an AD conversion module I in the probe rod, and the AD conversion module I is connected to a LORA wireless data transceiver module, which can realize wireless mutual transmission of signals with a CPT wireless collector.

Furthermore, a threaded sleeve is provided at the end of the probe rod, and a threaded rod is installed at the front end of the pressure relief device, so that the pressure relief device can be installed behind the probe rod.

The pressure transmitter comprises a diaphragm, a cylinder and an end sleeve. The pressure transmitter has a diaphragm on the outside and a cylinder on the inside. A pressure sensor is installed on the inner wall of the cylinder. Protective covers and locking nuts are installed at both ends of the diaphragm.

Furthermore, the pressure gauge adopts a single-chamber design. By selecting a reasonable aspect ratio, during the expansion process, an axisymmetric cylindrical hole is subjected to a uniform radial pressure, causing the soil around the hole wall to expand outward uniformly, thereby making the single-chamber pressure gauge close to the three-chamber design. The pressure gauge adopts a sealing method of slip-on plus locking nut at both ends, which solves the installation difficulty on the basis of improving the sealing effect. The diaphragm of the pressure gauge adopts a synthetic rubber formula, and the surface is reinforced by spiral winding. Without reducing the elasticity of the diaphragm, the service life, scratch resistance and wear resistance of the diaphragm are greatly improved.

Furthermore, the signal measured by the lateral pressure sensor will be converted into 24-bit, single-channel AD by the AD conversion module II on the surface, and then transmitted to the CPT wireless collector via the lateral pressure LORA wireless loading controller, and the corresponding relationship between pressure and deformation of the soil at each stage will be monitored in real time using computer collection and analysis software.

The ground control device includes a motor, a CPT wireless collector, and a liquid storage tank. The probe penetrates the soil under the action of the motor to perform a penetration test. When the probe reaches the planned depth, the touch control screen installed on the CPT wireless collector can be operated to allow the liquid storage tank to pressurize the lateral pressure device for a lateral pressure test. The CPT wireless collector is equipped with a lateral pressure LORA wireless loading controller, an AD conversion module II, and a touch control screen.

In order to better achieve the above-mentioned purpose of the invention, the present invention also provides a method for using a single-probe integrated data acquisition device, which specifically includes the following steps:

S1: Screw the threaded rod at the front end of the pressure gauge into the threaded sleeve at the end of the probe rod, and then connect the water pipe on the liquid storage tank to the pressure gauge;

S2: Connect the motor to the probe. Under the action of the motor, the probe is pressed vertically and uniformly into the soil to carry out a static penetration test. The pore pressure sensor, cone tip sensor, side wall sensor, biaxial inclination sensor and 3-channel acceleration sensor in the probe and the probe rod are used to measure the cone head resistance, side wall friction resistance, pore water pressure, acceleration and shear wave velocity of the probe when penetrating the soil. Then the AD conversion module I converts the measured signal in real time and transmits the data to the CPT wireless collector through the LORA wireless data transceiver module.

S3: As the probe penetrates the soil, when the pressure gauge reaches the depth to be tested, stop drilling, fill the pressure gauge with water from the storage tank, and operate the pressure LORA wireless loading controller to pressurize the vertical hole of the pressure gauge, so that the diaphragm expands, and the diaphragm transmits the pressure to the surrounding soil, causing the soil to deform until it is destroyed. The pressure sensor in the pressure gauge can detect the pressure data signal generated when the surrounding soil deforms, and then the AD conversion module II can convert the measured signal in real time and transmit it to the CPT wireless collector via the pressure LORA wireless loading controller;

S4: The CPT wireless data acquisition instrument processes the collected signals in real time, and uses computer acquisition and analysis software to provide real-time feedback to the probe and the pressure transmitter, ultimately completing data collection.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention realizes the integration of penetration and lateral pressure test by installing a lateral pressure test device behind the static penetration probe rod. It has a simple structure and is easy to operate. When the probe penetrates the soil, the cone tip resistance, side wall friction resistance, and pore water pressure during the penetration process can be measured; when the probe reaches the intended depth, the lateral pressure test can also be performed to obtain the stress-strain characteristics of the soil, which greatly saves the time cost of soil exploration in engineering;

2. The present invention converts the sensor monitoring data in real time through the AD conversion module. The penetration test data and the lateral pressure test data are respectively transmitted to the CPT wireless collector through the LORA wireless data transceiver module and the lateral pressure LORA wireless loading controller in real time, thereby realizing the real-time collection of the penetration and lateral pressure test data.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

FIG. 1 is a schematic diagram of the internal structure of the probe of the present invention.

FIG. 2 is a schematic diagram of the external structure of the probe and the internal structure of the probe rod of the present invention.

FIG. 3 is a schematic diagram of the internal structure of the pressure relief device of the present invention.

FIG. 4 is a schematic diagram of a ground control device according to the present invention.

FIG. 5 is a CPT wireless data collector of the present invention.

FIG. 6 is a flow chart of test data collection of the present invention.

Among them, the accompanying drawings are marked as follows: 1. cone head; 2. permeable stone; 3. pore pressure sensor; 4. cone tip sensor; 5. side wall sensor; 6-1. friction sleeve I; 6-2. friction sleeve II; 7-1. signal line I; 7-2. signal line II; 8. cable channel; 9. dual-axis tilt sensor; 10. 3-channel acceleration sensor; 11. signal acquisition device; 11-1. AD conversion module I; 11-2. LORA wireless data transceiver module; 12. threaded sleeve; 13. lower end locking nut; 14. lower end protective cover; 15. diaphragm; 16. cylinder; 17. upper end protective cover; 18. upper end locking nut; 19. lateral pressure sensor; 20. bolt rod; 21. motor; 22. CPT wireless collector; 23. liquid storage tank; 22-1. lateral pressure LORA wireless loading controller; 22-2. AD conversion module II; 22-3. touch control screen.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 those skilled in the art without creative work are within the scope of protection of the present invention.

As shown in FIG. 1 to FIG. 3 , the present invention provides a single-rod integrated data acquisition device, including a probe, a rod, a pressure gauge, and a ground control device.

As shown in Figure 1, the front end of the probe is a cone head 1, and a pore pressure sensor 3 for detecting pore water pressure is arranged above the cone head 1. Permeable stones 2 are symmetrically arranged on both sides of the pore pressure sensor 3, and the pore pressure sensor 3 is directly connected to the signal acquisition device 11. Cone tip sensors 4 for detecting cone tip resistance are symmetrically arranged on the inner wall of the friction sleeve I 6-1. The cone tip sensor 4 is connected to the signal acquisition device 11 through the cable channel 8 connected to the signal acquisition device 11 via the signal line I 7-1. Side wall sensors 5 for detecting side friction resistance are symmetrically arranged on the inner wall of the friction sleeve I 6-1 above the cone tip sensor 4. The side wall sensor 5 is connected to the signal acquisition device 11 through the cable channel 8 connected to the signal acquisition device 11 via the signal line II 7-2.

The above scheme is adopted: under the action of the motor 21, the probe is pressed vertically and uniformly into the soil to carry out a static penetration test. The pore pressure sensor 3, cone tip sensor 4, side wall sensor 5, dual-axis inclination sensor 9 and 3-channel acceleration sensor 10 in the probe are used to measure the cone head resistance, side wall friction resistance, pore water pressure and acceleration of the probe when penetrating into the soil. Then the AD conversion module I11-1 converts the measured signal in real time and transmits the data to the CPT wireless collector 22 through the LORA wireless data transceiver module 11-2.

Referring to Figure 2, the probe rod is provided with a signal acquisition device 11 for sending and receiving signals, a dual-axis tilt sensor 9, and a 3-channel acceleration sensor 10 from bottom to top. The signal acquisition device 11 includes an AD conversion module I11-1 and a LORA wireless data transceiver module 11-2. The outside of the rod is a friction sleeve II 6-2, a threaded sleeve 12 is provided at the end of the probe rod, and a bolt rod 20 is provided at the front end of the pressure gauge.

The above scheme is adopted: as the probe rod penetrates into the soil, the dual-axis inclination sensor 9 and the 3-channel acceleration sensor 10 in the probe rod are used to measure the dual-axis inclination angle and shear wave velocity of the probe rod when it penetrates into the soil, and the real-time transmission of the signal with the ground CPT wireless collector 22 is realized through the AD conversion module I11-1 and the LORA wireless data transceiver module 11-2; the lateral pressure device is connected to the probe rod through the connection between the threaded sleeve 12 and the bolt rod 20, so as to realize the integration of the penetration test and the lateral pressure test;

Referring to Figure 3, the pressure gauge has a diaphragm 15 on the outside and a cylinder 16 on the inside, with a lower protective cover 14 and an upper protective cover 17 at both ends respectively, and is sealed by a lower locking nut 13 and an upper locking nut 18; a pressure sensor 19 is provided inside the pressure gauge, and the pressure sensor 19 is connected to the ground CPT wireless collector 22 through a ground pressure LORA wireless loading controller 22-1.

The above scheme is adopted: when the lateral pressure gauge reaches the depth to be tested, drilling is stopped, the liquid storage tank 23 is filled with water into the lateral pressure gauge, and the lateral pressure LORA wireless loading controller 22-1 is operated to pressurize the vertical hole of the lateral pressure gauge, so that the diaphragm 15 expands, and the diaphragm 15 transmits the pressure to the surrounding soil, causing the soil to deform until it is destroyed. The lateral pressure sensor 19 provided in the lateral pressure gauge can detect the lateral pressure data signal generated when the peripheral soil is deformed, and then the AD conversion module II 22-2 can convert the measured signal in real time and transmit it to the CPT wireless collector 22 via the lateral pressure LORA wireless loading controller 22-1;

4 and 5 , the ground control device includes a motor 21 , a CPT wireless collector 22 , and a liquid storage tank 23 . The CPT wireless collector 22 is equipped with a LORA wireless loading controller 22 - 1 , an AD conversion module II 22 - 2 , and a touch control screen 22 - 3 .

The above scheme is adopted: after the CPT wireless collector 22 receives the data transmitted by the signal acquisition device 11 and the lateral pressure LORA wireless loading controller 22-1, the CPT wireless collector 22 processes the data, and further controls the motor 21 and the liquid storage tank 23 through the computer acquisition and analysis software to provide feedback to the probe and the lateral pressure sensor to realize data collection. The CPT wireless collector 22 is provided with a touch control screen 22-3, which is convenient for real-time control of the sounding and lateral pressure test process and data visualization.

The working principle of the present invention is as follows: when the motor 21 drives the probe to penetrate the soil, the signals measured by the cone tip sensor 3, pore pressure sensor 4, side wall sensor 5 and dual-axis tilt sensor 9 in the probe and the probe rod will be converted into 24 bits and 5 channels by the AD conversion module Ⅰ11-1 in the probe rod, and then transmitted to the LORA wireless data transceiver module 11-2 in the probe rod, which transmits the collected signals to the surface CPT wireless collector 22 in the form of radio waves; the signals measured by the 3-channel acceleration sensor 10 will be converted into 24 bits and 3 channels by the AD conversion module Ⅰ11-1 in the probe rod, and then transmitted to the LOR A wireless data transceiver module 11-2, which transmits the collected signals to the surface CPT wireless collector 22 in the form of radio waves; when the probe reaches the planned depth, the liquid storage tank 23 is filled with water into the lateral pressure gauge, and the lateral pressure LORA wireless loading controller 22-1 is operated to pressurize the vertical hole of the lateral pressure gauge to conduct a lateral pressure test. The signal measured by the lateral pressure sensor 19 will be converted into 24 bits and single channels by the AD conversion module II 22-2, and then transmitted to the surface CPT wireless collector 22 via the lateral pressure LORA wireless loading controller 22-1; finally, the test data can be detected in real time using computer collection and analysis software.

The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. A single probe rod integrated data acquisition device is characterized in that: comprises a probe, a probe rod, a side pressure device and a ground control device;

The probe comprises a conical head (1), a permeable stone (2), a pore pressure sensor (3), a conical tip sensor (4), a side wall sensor (5), a friction sleeve I (6-1), a signal wire I (7-1), a signal wire II (7-2) and a cable channel (8);

The probe rod comprises a friction sleeve II (6-2), a double-shaft inclination angle sensor (9), a 3-channel acceleration sensor (10), a signal acquisition device (11) and a threaded sleeve (12); the signal acquisition device (11) comprises an AD conversion module I (11-1) and a LORA wireless data receiving and transmitting module (11-2);

The side pressure device comprises a lower end locking nut (13), a lower end shield (14), a diaphragm (15), a cylinder body (16), an upper end shield (17), an upper end locking nut (18), a side pressure sensor (19) and a bolt rod (20);

The ground control device comprises a motor (21), a CPT wireless acquisition instrument (22) and a liquid storage tank (23), wherein a side-pressure LORA wireless loading controller (22-1), an AD conversion module II (22-2) and a touch control screen (22-3) are arranged on the CPT wireless acquisition instrument (22).

2. The single probe integrated data acquisition device of claim 1, wherein: the outer wall of the probe is a friction sleeve I (6-1), the foremost end of the probe is a conical head (1), a pore pressure sensor (3) is arranged above the conical head (1), permeable stones (2) are symmetrically arranged on two sides of the pore pressure sensor (3), and a conical tip sensor (4) and a side wall sensor (5) are symmetrically arranged on the inner wall of the friction sleeve I (6-1); the pore pressure sensor (3), the cone tip sensor (4) and the side wall sensor (5) are connected with the AD conversion module I (11-1) through the cable channel (8), and the measured signals are transmitted to the AD conversion module I (11-1) in real time.

3. The single probe integrated data acquisition device of claim 1, wherein: the outer wall of the probe rod is a friction sleeve II (6-2), a threaded sleeve (12) is arranged at the tail end of the probe rod, a double-shaft inclination angle sensor (9) and a 3-channel acceleration sensor (10) are arranged in the probe rod, the double-shaft inclination angle sensor (9) and the 3-channel acceleration sensor (10) are connected with an AD conversion module I (11-1), and measured signals are transmitted to the AD conversion module I (11-1) in real time.

4. The single probe integrated data acquisition device of claim 1, wherein: the diameter of the side pressure device is the same as that of the probe rod, the diaphragm (15) is arranged outside the side pressure device, the cylinder (16) is arranged inside the side pressure device, the lower end shield (14) and the upper end shield (17) are respectively arranged at two ends of the side pressure device, the side pressure device is sealed by utilizing the lower end locking nut (13) and the upper end locking nut (18), the side pressure sensor (19) is arranged on the inner wall of the cylinder (16), the side pressure sensor (19) is connected with the AD conversion module II (22-2), and the measured signal can be transmitted to the AD conversion module II (22-2) in real time.

5. The single probe integrated data acquisition device of claim 1, wherein: the AD conversion module I (11-1) is connected with the LORA wireless data receiving and transmitting module (11-2), the AD conversion module I (11-1) can conduct 24-bit and 5-channel AD conversion on signals measured by the pore pressure sensor (3), the cone tip sensor (4), the side wall sensor (5) and the double-shaft inclination sensor (9), conduct 24-bit and 3-channel AD conversion on signals measured by the 3-channel acceleration sensor (10), and transmit collected data to the CPT wireless collector (22) in real time through the LORA wireless data receiving and transmitting module (11-2).

6. The single probe integrated data acquisition device of claim 1, wherein: the AD conversion module II (22-2) can perform 24-bit single-channel AD conversion on the signal measured by the side pressure sensor (19), and the signal is transmitted to the CPT wireless acquisition instrument (22) in real time through the side pressure LORA wireless loading controller (22-1).

7. The single probe integrated data acquisition device of claim 1, wherein: the CPT wireless acquisition instrument (22) is connected with a computer for data processing, the motor (21) and the liquid storage tank (23) are further controlled by computer acquisition analysis software to feed back the probe and the side pressure device, data acquisition is achieved, the CPT wireless acquisition instrument (22) is provided with a touch control screen (22-3), and the touch detection and side pressure test process is convenient to control in real time, and data visualization is achieved.

8. The single probe integrated data acquisition device of claim 1, wherein: the tail end of the probe rod is provided with a threaded sleeve (12), and the probe rod is connected with the side pressure device through the threaded sleeve (12) and a threaded rod (20) at the front end of the side pressure device, so that the integration of the touch probe and the side pressure test is realized.

9. A method of using a single probe integrated data acquisition device as set forth in claim 1, wherein: the method comprises the following steps:

S1: screwing a threaded rod (20) at the front end of the side pressure device into a threaded sleeve (12) at the tail end of the probe rod, and then connecting a water pipe on a liquid storage tank (23) into the side pressure device;

S2: the method comprises the steps that a motor (21) is connected with a probe, the probe is vertically pressed into soil at a constant speed under the action of the motor (21), a static cone penetration test is carried out, cone head resistance, side wall friction resistance, pore water pressure, acceleration and shear wave speed of the probe when penetrating into the soil are measured by using a hole pressure sensor (3), a cone tip sensor (4), a side wall sensor (5), a double-shaft inclination sensor (9) and a 3-channel acceleration sensor (10) in the probe and a probe rod, then an AD conversion module I (11-1) converts the measured signals in real time and transmits data to a CPT wireless acquisition instrument (22) through a LORA wireless data transceiver module (11-2);

S3: when the probe penetrates into soil body and the side pressure device reaches the depth to be tested, drilling is stopped, the liquid storage tank (23) is filled with water into the side pressure device, the side pressure LORA wireless loading controller (22-1) is operated, the side pressure device is pressurized in a vertical hole, the diaphragm (15) is expanded, the pressure is transmitted to surrounding soil body by the diaphragm (15), the soil body is deformed until the soil body is damaged, the side pressure sensor (19) arranged in the side pressure device can detect side pressure data signals generated when the peripheral soil body is deformed, and then the AD conversion module II (22-2) can convert the detected signals in real time and transmit the signals to the CPT wireless acquisition instrument (22) through the side pressure LORA wireless loading controller (22-1);

s4: the CPT wireless acquisition instrument (22) processes the acquired signals in real time, and the computer acquisition analysis software can feed back the probe and the side pressure device in real time to finally finish the data acquisition.