CN218204285U - Piezocone sounding probe calibrating device based on vacuum degassing - Google Patents
Piezocone sounding probe calibrating device based on vacuum degassing Download PDFInfo
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- CN218204285U CN218204285U CN202221835451.3U CN202221835451U CN218204285U CN 218204285 U CN218204285 U CN 218204285U CN 202221835451 U CN202221835451 U CN 202221835451U CN 218204285 U CN218204285 U CN 218204285U
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Abstract
The utility model provides a pore pressure static sounding probe calibrating device based on vacuum degassing, which comprises a first container, a second container, a vacuum pump, a high-pressure air source and a four-way pipe; the top of the second container is provided with a sealing top cover, the lower part of the second container is communicated with the lower part of the first container through a second liquid valve, and the outer side wall of the second container is provided with scale marks; the bottom of the vacuum pump is provided with a buffer plate; the four-way pipe comprises four branch pipes, wherein a pressure gauge is arranged on one branch pipe, the four branch pipes are respectively connected with the upper part of the second container through a first air valve, connected with the vacuum pump through a second air valve, connected with the atmosphere through a third air valve, and connected with an air source stop valve of a high-pressure air source through a fourth air valve. The utility model can carry out vacuum degassing on the closed environment where the probe is positioned, thereby improving the effectiveness of vacuum degassing; the probe can be fully saturated more effectively; the experiment operation is simple and convenient, and repeated addition of saturated liquid is avoided.
Description
Technical Field
The utility model relates to an environment reconnaissance testing arrangement, especially a piezocone sounding probe calibrating device based on vacuum degassing.
Background
The static cone penetration test has wide application in the field of environmental investigation, the static pressure is used for pressing a measuring probe into a soil layer sample at a constant speed, the resistance of the probe on the sample can be converted into an electric signal to be output, and then the soil engineering parameters are obtained through the correlation between the resistance and the geological characteristics. The technology can avoid disturbance to the original structure of the sample in the operation process of sampling or transportation to the maximum extent, and has the advantages of high efficiency, convenience, accuracy, economy and the like.
The pore pressure static sounding is a probe provided with a water permeable filter and a pore water pressure measuring element, can quickly acquire the macrostructure characteristics of a measured sample, and simultaneously measures the cone head resistance, the side friction resistance and the pore water pressure, thereby quickly determining a series of engineering information such as a soil layer profile, a consolidation coefficient and the like of the measured sample and further achieving the purpose of geological exploration.
Static sounding is used as one of engineering exploration in-situ test means, measurement needs to be carried out in a complex environment for a long time during actual exploration, and due to the fact that a probe is in direct contact with different soil or sediments, a permeable filter membrane device and related sensing elements of the probe are prone to corrosion, the measured pore water pressure value is affected, the measured values of cone end resistance and side friction resistance of a static sounding instrument are difficult to accurately obtain, high requirements on the accuracy and reliability of measurement of a static sounding system are provided, and therefore regular tracing of the pore static sounding is needed, and the accuracy and reliability of the measured values of the pore static sounding are guaranteed.
When the conventional piezocone penetration test probe is used for calibration test, the probe needs to be degassed and saturated, and if the probe is not degassed or not saturated completely, the variation of the pore water pressure in the soil body can be converted into the volume variation of air in the process of transmission, so that the pore pressure probe cannot obtain the truest pore water pressure value.
Traditional saturation device need carry out degasification and saturation simultaneously with piezocone penetration probe submergence in saturated liquid and handle, this will influence and will remain in the conduction storehouse of piezocone penetration probe and the hole of permeating water in the exhaust process and contain a large amount of air, consequently the probe can't be saturated by saturated liquid completely, under this condition, it can turn into the volume change of air at its variable quantity of transmission process to have a part pore water pressure during the measurement, cause the pore pressure test value to be on the low side and the peak-eliminating hysteresis effect than the true value, can't obtain the truest pore water pressure value, and after the experiment, get out the probe earlier and pour out the saturated liquid again, its operation is inconvenient, and lead to the saturated liquid to spill easily.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a pore pressure static sounding probe calibration device based on vacuum degassing, which can perform vacuum degassing on the closed environment where the probe is located, thereby improving the effectiveness of vacuum degassing; the probe can be fully saturated more effectively; the experiment operation is simple and convenient, and repeated addition of saturated liquid is avoided.
The utility model discloses a realize like this: a pore pressure static sounding probe calibration device based on vacuum degassing comprises a first container, a second container, a vacuum pump, a high-pressure air source and a four-way pipe; the top of the first container is provided with a container cover, and the lower part of the first container is provided with a first liquid valve; the top of the second container is provided with a sealing top cover, the middle of the sealing top cover is provided with a through hole, a sealing ring is arranged in the through hole, the lower part of the second container is communicated with the lower part of the first container through a second liquid valve, and the outer side wall of the second container is provided with scale marks; the bottom of the vacuum pump is provided with a buffer plate; the top of the high-pressure gas source is connected with a gas source stop valve through a pipeline; the four-way pipe comprises four branch pipes, wherein a pressure gauge is arranged on one of the branch pipes, the four branch pipes are respectively connected with the upper part of the second container through a first air valve, connected with the vacuum pump through a second air valve, connected with the atmosphere through a third air valve and connected with an air source stop valve of the high-pressure air source through a fourth air valve.
Furthermore, still include a base, first container, second container, vacuum pump and high pressurized air source all set up in on the base, one side of base is equipped with the leader, the bottom of base is equipped with the area brake wheel, makes things convenient for the device to remove and fix.
Furthermore, the inner bottom wall of the first container is obliquely arranged, and the first liquid valve is connected with the lowest point of the inner bottom wall, so that saturated liquid in the first container can be conveniently discharged from the first liquid valve.
Furthermore, the lower part of the second container is also provided with a third liquid valve, so that saturated liquid in the second container can be conveniently discharged from the third liquid valve.
Furthermore, the second container and the sealing top cover are fixed in a sealing mode through a fixing clamp, and the second container is guaranteed to be in close contact with the sealing top cover.
The utility model has the advantages that: the utility model relates to a pore pressure static sounding probe calibrating device based on vacuum degassing, 1, the two container designs that adopt first container and second container can be gone on degassing treatment and saturation treatment substep, at first can carry out vacuum degassing with the airtight environment at probe place, have improved the validity of vacuum degassing, secondly can more effectively get to make the probe can obtain abundant saturation. 2. In a laboratory, the pressure can be controlled to be increased and released slowly through the air valve, and the calibration of the piezocone is carried out, so that the precision of the piezocone penetration probe in the detection process is ensured. 3. After the experiment is finished, the operation that the probe is taken out firstly and then the saturated liquid is poured out in the traditional method is avoided, so that the operation is more convenient and faster, meanwhile, the saturated liquid can be prevented from spilling and leaking, and the operation is more environment-friendly. 4. The suitable sealing ring can be selected according to the probes of different models, so that the device meets the majority of static penetrometer on the market.
Drawings
The present invention will be further described with reference to the following examples and drawings.
Fig. 1 is the utility model relates to a piezocone sounding probe calibrating device's schematic structure based on vacuum degassing.
The reference numbers indicate: the device comprises a first container 1, a container cover 11, a first liquid valve 12, a second container 2, a sealing top cover 21, a through hole 211, a sealing ring 212, a second liquid valve 22, a scale mark 23, a third liquid valve 24, a fixing clamp 25, a vacuum pump 3, a buffer plate 31, a high-pressure air source 4, an air source stop valve 41, a four-way pipe 5, a pressure gauge 51, a first air valve 52, a second air valve 53, a third air valve 54, a fourth air valve 55, a base 6, a handle 61, a wheel 62 and a probe 7.
Detailed Description
Referring to fig. 1, the present invention relates to a calibration device for a piezocone sounding probe based on vacuum degassing, which comprises a first container 1, a second container 2, a vacuum pump 3, a high pressure gas source 4, a four-way pipe 5 and a base 6; the top of the first container 1 is provided with a container cover 11, the lower part of the first container is provided with a first liquid valve 12, the inner bottom wall of the first container 1 is obliquely arranged, and the first liquid valve 12 is connected with the lowest point of the inner bottom wall, so that saturated liquid in the first container 1 can be conveniently discharged from the first liquid valve 12. The top of the second container 2 is provided with a sealing top cover 21, the second container 2 and the sealing top cover are sealed and fixed through a fixing clamp 25, so that the second container 2 is in close contact with the sealing top cover 21, a through hole 211 is formed in the middle of the sealing top cover 21, a sealing ring 212 of different specifications is arranged in the through hole 211, the sealing ring 212 with the inner diameter matched with the probe 7 is selected according to the overall dimension of the probe 7 to be calibrated, the outer diameter of the sealing ring 212 is matched with the size of the through hole 211 of the sealing top cover 21, the lower part of the second container 2 is communicated with the lower part of the first container 1 through a second liquid valve 22, the outer side wall of the second container 2 is provided with scale marks 23, the liquid level of saturated liquid in the second container 2 can be observed through the scale marks 23 during testing, and the lower part of the second container 2 is further provided with a third liquid valve 24, so that the saturated liquid in the second container 2 can be conveniently discharged from the third liquid valve 24. The bottom of the vacuum pump 3 is provided with a buffer plate 31 for buffering the vibration generated in the operation process; the top of the high-pressure air source 4 is connected with an air source stop valve 41 through a pipeline; the four-way pipe 5 comprises four branch pipes, wherein one branch pipe is provided with a pressure gauge 51, the pressure gauge 51 can monitor the air pressure in the whole air path system, and the four branch pipes are respectively connected with the upper part of the second container 2 through a first air valve 52, connected with the vacuum pump 3 through a second air valve 53, connected with the atmosphere through a third air valve 54 and connected with the air source stop valve 41 of the high-pressure air source 4 through a fourth air valve 55. Still include a base 6, first container 1, second container 2, vacuum pump 3 and high pressurized air source 4 all set up in on the base 6, one side of base 6 is equipped with a leader 61, the bottom of base 6 is equipped with takes brake wheel 62, makes things convenient for the device to remove and fix.
The working principle is as follows: and installing a matched sealing ring 212 on the outer wall of the static sounding probe 7 to be calibrated, then sleeving the sealing ring on a through hole 211 in the center of the sealing top cover 21, covering the sealing top cover 21 on the second container 2, further enabling the sealing top cover 21 to be in close contact with the second container 2 through the fixing clamp 25, ensuring the air tightness of the sealing top cover, and arranging the probe 7 at a position which is less than one third of the height of the second container 2. The high-pressure gas source 4 is connected with the gas source stop valve 41 through a pipeline, all liquid valves and gas valves are closed, the container cover 11 is opened, the first container 1 is filled with saturated liquid, and then the container cover 11 is tightly covered.
Firstly, degassing treatment is carried out on a static cone penetration probe 7 to be calibrated, and the degassing treatment steps are as follows: the vacuum pump 3 is started firstly, after the operation is normal, the second air valve 53, the fourth air valve 55 and the air source stop valve 41 are opened, after the air pumping is carried out for a period of time, the pressure gauge 51 is observed, whether the pressure value displayed by the pressure gauge 51 is-0.1 MPa or not is checked, if the pressure value is smaller than-0.1 PMa, whether the pipeline connection positions among the four-way pipe 5, the second container 2, the vacuum pump 3, the atmosphere and the high-pressure air source 4 are sealed or not is checked, the air leakage position is removed in time, and otherwise, the air pumping cannot be continued. If the pressure value displayed by the pressure gauge 51 is-0.1 MPa, the fourth air valve 55 and the air source stop valve 41 are closed, the first air valve 52 is slowly opened, at this time, the air in the second container 2 is pumped out by the vacuum pump 3, the air in the second container 2 is fully exhausted after the air is pumped out for a period of time, whether the pressure value displayed by the pressure gauge 51 is-0.1 MPa is checked, if the pressure value is less than-0.1 MPa, whether each sealing part of the second container 2 is improperly sealed or not is checked, the air leakage part is timely removed, and otherwise, the air pumping cannot be continued. And when the continuous vacuum pumping is kept for more than 60min, the pressure value displayed by the pressure gauge 51 is always-0.1 MPa after the period of time, which indicates that the air in the second container 2 is fully exhausted, the second air valve 53 is closed, whether the pressure value displayed by the pressure gauge 51 changes or not is observed after the period of time, and if the negative pressure degree is weakened, the sealing part of the device needs to be inspected again and air is pumped again. If the pressure value displayed by the pressure gauge 51 does not change after the second air valve 53 is closed, it indicates that the device is sealed well and the degassing process of the probe 7 is completed, and the next saturation process can be continued.
The saturation treatment steps are as follows: at this time, when the degassing process of the probe 7 is completed, the first air valve 52 is closed, the second liquid valve 22 is opened, and under the action of the negative pressure, the saturated liquid in the first container 1 flows into the second container 2, and the liquid level of the scale mark 23 can be observed, and when the liquid level displayed by the scale mark 23 enables the conical head part at the front end of the probe 7 to be completely immersed in the saturated liquid, the second liquid valve 22 can be closed, and at this time, the pore pressure element and the sensor of the probe 7 are completely saturated, and the saturation process is completed. The next step of the piezocone penetration pressure calibration may be continued.
And (3) pressurizing calibration: firstly, the first air valve 52 and the air source stop valve 41 are opened, the fourth air valve 55 is slowly opened, air of the high-pressure air source 4 slowly enters the second container 2, along with the entering of the air, the air pressure of the second container 2 is gradually increased, the pressure can be displayed by the pressure gauge 51, the increasing speed of the air pressure in the second container 2 can be regulated and controlled by controlling the fourth air valve 55, the fourth air valve 55 is closed when the pressure value displayed by the pressure gauge 51 reaches the expected pressure value, and the indicating value sensed by the probe 7 is recorded at the moment. And then the pressure value displayed by the pressure gauge 51 is gradually increased by controlling the fourth air valve 55, indication values sensed by the probe 7 under different expected pressure values are recorded, pressurization calibration is completed, and pressure relief calibration of the next piezocone penetration test can be carried out.
Pressure relief calibration: the fourth air valve 55 and the air source stop valve 41 are closed, the third air valve 54 is opened slowly, the air in the second container 2 is discharged into the air gradually, the air pressure in the second container 2 is reduced gradually along with the discharge of the air, the pressure can be displayed by the pressure gauge 51, and the speed of the reduction of the air pressure in the second container 2 can be regulated and controlled by controlling the third air valve 54. When the displayed pressure value of the pressure gauge 51 reaches the expected pressure value, the third air valve 54 is closed, and the indication value sensed by the probe 7 at this time is recorded after stabilization. And then, the third air valve 51 is controlled to gradually reduce the pressure value displayed by the pressure gauge 51, and the indication value sensed by the probe 7 under different expected pressure values is recorded to finish the calibration of the pressure relief of the pore pressure static.
After the experiment is finished, the second air valve 53 and the third air valve 54 are opened, the vacuum pump 3 is enabled to be communicated with the atmosphere, and the vacuum pump 3 is closed. Closing the second gas valve 53 and the third gas valve 54, opening the second liquid valve 22 and the first gas valve 52, slowly regulating and controlling the fourth gas valve 55 to increase the gas volume of the high-pressure gas source 4, returning the saturated liquid in the second container 2 to flow into the first container 1 through the gas pressure, judging that the saturated liquid basically flows back into the first container 1 by observing the liquid level of the scale mark 23, closing the second liquid valve 22, and opening the first liquid valve 12 of the first container 1, wherein the saturated liquid can be discharged from the first liquid valve 12.
The utility model has the advantages of: the utility model relates to a pore pressure static sounding probe calibrating device based on vacuum degassing, 1, adopt the design of the two containers of first container 1 and second container 2, can handle degassing and saturation step by step and go on, at first can carry out vacuum degassing with the airtight environment at probe place, improved the validity of vacuum degassing, secondly can more effectively get to make the probe can obtain abundant saturation. 2. In a laboratory, the pressure can be controlled to be increased and released slowly through the air valve, and the calibration of the piezocone is carried out, so that the precision of the piezocone penetration probe in the detection process is ensured. 3. After the experiment is finished, the operation that the probe is taken out firstly and then the saturated liquid is poured out in the traditional method is avoided, so that the operation is more convenient and faster, the saturated liquid can be prevented from being leaked, and the operation is more environment-friendly. 4. The suitable sealing ring can be selected according to the probes of different models, so that the device meets the majority of static penetrometer on the market.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (5)
1. The utility model provides a piezocone sounding probe calibrating device based on vacuum degassing which characterized in that: comprises that
The top of the first container is provided with a container cover, and the lower part of the first container is provided with a first liquid valve;
the top of the second container is provided with a sealing top cover, the middle of the sealing top cover is provided with a through hole, a sealing ring is arranged in the through hole, the lower part of the second container is communicated with the lower part of the first container through a second liquid valve, and the outer side wall of the second container is provided with scale marks;
a vacuum pump, the bottom of which is provided with a buffer plate;
the top of the high-pressure air source is connected with an air source stop valve through a pipeline;
and the four-way pipe comprises four branch pipes, wherein one branch pipe is provided with a pressure gauge, and the four branch pipes are respectively connected with the upper part of the second container through a first air valve, connected with the vacuum pump through a second air valve, connected with the atmosphere through a third air valve and connected with an air source stop valve of the high-pressure air source through a fourth air valve.
2. The calibration device for the piezocone penetration test probe based on vacuum degassing as claimed in claim 1, wherein: the vacuum pump is characterized by further comprising a base, wherein the first container, the second container, the vacuum pump and the high-pressure air source are arranged on the base, a handle is arranged on one side of the base, and a brake wheel is arranged at the bottom of the base.
3. The calibration device for the piezocone penetration test probe based on vacuum degassing as claimed in claim 1, wherein: the inner bottom wall of the first container is obliquely arranged, and the first liquid valve is connected with the lowest point of the inner bottom wall.
4. The calibration device for the piezocone penetration test probe based on vacuum degassing as claimed in claim 1, wherein: and the lower part of the second container is also provided with a third liquid valve.
5. The piezocone penetration test probe calibration apparatus based on vacuum degassing of claim 1, wherein: the second container and the sealing top cover are fixed in a sealing mode through a fixing clamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221835451.3U CN218204285U (en) | 2022-07-15 | 2022-07-15 | Piezocone sounding probe calibrating device based on vacuum degassing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221835451.3U CN218204285U (en) | 2022-07-15 | 2022-07-15 | Piezocone sounding probe calibrating device based on vacuum degassing |
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| CN218204285U true CN218204285U (en) | 2023-01-03 |
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| CN202221835451.3U Active CN218204285U (en) | 2022-07-15 | 2022-07-15 | Piezocone sounding probe calibrating device based on vacuum degassing |
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- 2022-07-15 CN CN202221835451.3U patent/CN218204285U/en active Active
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