CN112629975B - Geotechnical CBR test sample soaking device - Google Patents
Geotechnical CBR test sample soaking device Download PDFInfo
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- CN112629975B CN112629975B CN202011606026.2A CN202011606026A CN112629975B CN 112629975 B CN112629975 B CN 112629975B CN 202011606026 A CN202011606026 A CN 202011606026A CN 112629975 B CN112629975 B CN 112629975B
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- 238000002791 soaking Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 261
- 238000010438 heat treatment Methods 0.000 claims description 16
- 230000005291 magnetic effect Effects 0.000 claims description 12
- 238000005485 electric heating Methods 0.000 claims description 5
- 238000007572 expansion measurement Methods 0.000 claims description 3
- 238000007665 sagging Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
Abstract
The invention discloses a geotechnical CBR test sample soaking device, and relates to the field of civil engineering test detection. Comprises a test box, a water supply and drainage system, an expansion measuring device, a water level sensor, a water circulation system and a control system. The device is simple in principle, convenient to assemble, flexible to move, convenient to indoor arrangement, capable of automatically keeping water level and water temperature constant in the test process, capable of automatically completing test water supply and drainage, data recording and processing, accurate in test result, capable of greatly saving manpower compared with a traditional method and capable of avoiding test errors caused by manual operation.
Description
Technical Field
The invention belongs to the field of civil engineering test detection, and particularly relates to a geotechnical CBR test sample soaking device.
Background
The CBR test is used for evaluating the bearing capacity of the roadbed in an unfavorable state, and the CBR is used as a key mechanical index in the roadbed construction process, so that the accurate CBR value is of great significance to guiding construction. Three groups (nine) of samples are usually prepared during the test, and according to the standard requirements, a test cylinder with the test pieces is soaked in water for 4 days and days before the test, and the soaking water surface is kept at the upper part of the top surface of the test cylinder by 25mm.
In the actual operation process, a test cylinder with a test piece is generally put into a container such as a large storage box or a water basin, then water is injected to soak the test piece, the water surface can be reduced due to the water absorption of the test piece during the water soaking, and the water surface can meet the test requirement by manually observing for a long time and injecting water into the container in time; manually scooping out water in the container after the test piece is soaked; in the test process, the temperature of water in the container is changed continuously along with the change of the environmental temperature, so that the test result is affected, and the test cannot meet the high-precision requirement; in addition, the container with the test piece has large weight and inconvenient movement. The whole test piece soaking process has the defects of inconvenient water supply and drainage, lower precision and inconvenient movement of the test device, and needs to spend a great deal of manpower and time.
Disclosure of Invention
The invention aims to overcome the defects and provide a geotechnical CBR test sample soaking device.
The technical scheme of the invention is as follows: the geotechnical CBR test sample soaking device comprises a test box, an expansion measuring device and test cylinders for containing samples, wherein the test cylinders are placed in the test box, the expansion measuring device is used for measuring the soaking expansion amount of the samples, the geotechnical CBR test sample soaking device is also provided with a water supply and drainage system, a water circulation system and a control system, the test box is rectangular, a plurality of test cylinders are placed in the test box, a porous top plate is placed at the top of each test cylinder sample, an adjusting rod is fixed on the porous top plate, the expansion measuring device comprises an electronic dial indicator, a measuring head of the electronic dial indicator is positioned at the top of the adjusting rod, the electronic dial indicator is electrically connected with the control system, and the control system receives and automatically stores the expansion amount measured by the electronic dial indicator; the water supply and drainage system comprises a water storage tank, a water supply pump, a water supply pipe, a drainage pump, a drainage pipe and a water level sensor, wherein the water supply pump is connected with the water supply pipe, the water supply pump takes water from the water storage tank to the test tank, the drainage pump is connected with the drainage pipe, the drainage pump enables water to be drained from the test tank to the water storage tank, the water level sensor is arranged in the side wall of the test tank and is electrically connected with the control system, the control system is electrically connected with the water supply pump and the drainage pump, the water level sensor measures water level signals in the test tank, the signals are transmitted to the control system, and the control system controls the water supply pump and the drainage pump to work according to water levels; the water circulation system comprises a water outlet pipe, a water inlet pipe, a water flow circulation pump, a water temperature sensor, a refrigerating device, a heating device and a water circulation controller, wherein the water outlet pipe and the water inlet pipe are all connected with the bottom of the test box, the refrigerating device and the heating device are both positioned inside the water circulation system, the inlet and the outlet of the water flow circulation pump are respectively connected with the water outlet pipe and the water inlet pipe, the water temperature sensor is arranged in the test box, the water temperature sensor is electrically connected with the control system, the control system is connected with the water circulation controller, the water flow circulation pump, the refrigerating device and the heating device are electrically connected, the heating device is an electric heating sleeve and is sleeved on the water outlet pipe or the water inlet pipe, the refrigerating device is an annular sleeve wrapping water inlet pipe or the water outlet pipe, condensate is filled in the annular sleeve, the water temperature sensor measures the water temperature in the test box, a water temperature signal is transmitted to the control system, the control system controls the working state of the water circulation pump, the heating device and the water circulation controller is controlled to display the temperature of the water in the test box.
The water supply pump is located the water storage tank bottom, and water supply pipe one end stretches into the test box, and the drain pump is located the test box inside, and drain pipe one end stretches into the water storage tank.
Further, the bottom of the test box is provided with a universal wheel at the bottom of the test box, the universal wheel at the bottom of the test box is provided with a braking structure, one corner in the test box is provided with a groove, and the groove is used for placing a drainage pump.
The bottom of the water storage tank is provided with a universal wheel at the bottom of the water tank, and the universal wheel at the bottom of the water tank is provided with a braking structure.
The expansion measurement device is of a detachable and adjustable structure and comprises a magnetic gauge stand, a stay bar connector and an electronic dial indicator, wherein the magnetic gauge stand is adsorbed on the surface of a test box, the stay bar is a bar with threads, the stay bar connector is a member with two vertical screw holes, the lower part of the vertical stay bar is connected with the magnetic gauge stand, the upper part of the vertical stay bar is in threaded connection with the stay bar connector, two ends of the horizontal stay bar are respectively connected with the stay bar connector, the electronic dial indicator measuring head faces downwards, the upper part of the electronic dial indicator measuring head is connected onto the stay bar connector at the tail end, the connection length of the stay bar and the stay bar connector is adjustable through the threaded connection, and the sagging degree of the electronic dial indicator measuring head is adjustable.
The bottom of the water circulation system is provided with a water circulation system universal wheel which is provided with a brake structure.
The invention has the beneficial effects that: (1) The water storage device is provided with a water supply pump and a drainage pump, an external water source is not needed, and the water can be reused;
(2) Compared with the traditional test method, the water level sensor is adopted to control the water level in the test box, and water can be automatically supplemented when the water level drops, so that the water level is stable, and the manpower is greatly reduced;
(3) The water in the test box can be controlled to be constant, so that the accuracy of test data is ensured;
(4) The device can automatically save data after the test is finished, and can automatically drain water in the test box;
(5) The universal wheels are arranged at the bottoms of all the components of the device, so that the test device can be flexibly moved, the manpower is greatly saved, and the space utilization rate of a laboratory is improved;
(6) The device is simple and convenient to operate, can be repeatedly used, and can automatically measure the expansion of the test and process and store the data.
Drawings
FIG. 1 is a southwest isometric view of the present device;
FIG. 2 is an isometric southeast view of the present device;
FIG. 3 is a top view of the present device;
FIG. 4 is a southwest isometric view of the water supply and drainage system of the device
FIG. 5 is a southwest isometric view of the electronic dial indicator of the present device;
FIG. 6 is a southwest isometric view of the cartridge with test piece and the adjustment lever of the present device;
icon: 1-a test box; 2, a universal wheel at the bottom of the test box; 3-a water supply and drainage system; 4-a water storage tank; 5-a water supply pump; 6, a water supply pipe; 7-draining pump; 8-a drain pipe; 9-universal wheels at the bottom of the water tank; 10-an expansion measurement device; 11-a magnetic gauge stand; 12-stay bar; 13-stay connector; 14-electronic dial indicator; 15-a water level sensor; 16-a water circulation system; 17-a water outlet pipe; 18-a water inlet pipe; 19-a water flow circulating pump; 20-a water temperature sensor; 21-a refrigerating device; 22-heating means; 23-a water circulation control device; 24-universal wheels of a water circulation system; 25-a control system; 26-a test cartridge with test piece; 27-adjusting rod.
Detailed Description
As shown in the figure, the geotechnical CBR test sample soaking device comprises a test box 1, an expansion measuring device 10 and test cylinders 26 for containing samples, wherein the test cylinders 26 are placed in the test box 1, the expansion measuring device 10 is used for measuring the soaking expansion amount of the samples, a water supply and drainage system 3, a water circulation system 16 and a control system 25 are further arranged, the test box 1 is rectangular, a plurality of test cylinders 26 are placed in the test cylinders 26, a porous top plate is placed at the top of the test samples, an adjusting rod 27 is fixed on the porous top plate, the expansion measuring device comprises an electronic dial indicator 14, a measuring head of the electronic dial indicator 14 is positioned at the top of the adjusting rod 27, the electronic dial indicator 14 is electrically connected with the control system 25, and the control system 25 receives and automatically stores the expansion amount measured by the electronic dial indicator 14.
The water supply and drainage system 3 comprises a water storage tank 4, a water supply pump 5, a water supply pipe 6, a drainage pump 7, a drainage pipe 8 and a water level sensor 15, wherein the water supply pump 5 is connected with the water supply pipe 6, the water supply pump 5 takes water from the water storage tank 4 to the test box 1, the drainage pump 7 is connected with the drainage pipe 8, the drainage pump 7 discharges water from the test box 1 to the water storage tank 4, the water level sensor 15 is arranged inside the side wall of the test box 1, the water level sensor is electrically connected with a control system 25, the control system 25 is electrically connected with the water supply pump 5 and the drainage pump 7, the water level sensor measures water level signals in the test box, and the signals are transmitted to the control system 25, and the control system 25 controls the working states of the water supply pump 5 and the drainage pump 7 according to water level. The water level in the test box 1 is kept 25mm above the top surface of the test tube 26 through the water supply and drainage system 3, a specific water level value can be measured by the water level sensor 15 and fed back to the control system 25, when the water level is lower than a set water level, the control system 25 controls the water supply pump 5 to be opened, the water level rises, and when the water level reaches a required value, the water supply pump 5 is controlled to be closed. When the test is completed, the control system 25 controls the drain pump 7 to drain the water in the test chamber 1 back to the water reservoir 4 through the drain pipe 8. The water circulation system 16 remains open during the specimen soaking process.
The water circulation system 16 comprises a water outlet pipe 17, a water inlet pipe 18, a water flow circulation pump 19, a water temperature sensor 20, a refrigerating device 21, a heating device 22 and a water circulation controller 23, wherein the water outlet pipe 17 and the water inlet pipe 18 are connected with the bottom of the test box 1, the refrigerating device 21 and the heating device 22 are both positioned in the water circulation system 16, an inlet and an outlet of the water flow circulation pump 19 are respectively connected with the water outlet pipe 17 and the water inlet pipe 18, the water temperature sensor 20 is arranged in the test box 1, the water temperature sensor 20 is electrically connected with a control system 25, the control system 25 is connected with the water circulation controller 23, the control system 25 is electrically connected with the water flow circulation pump 19, the refrigerating device 21 and the heating device 22, the heating device 22 is an electric heating sleeve, the electric heating device is sleeved on the water outlet pipe 17 or the water outlet pipe 18, the refrigerating device 21 is an annular sleeve for wrapping the water inlet pipe or the water outlet pipe 17, and condensate is filled in the annular sleeve. The water temperature sensor 20 measures the water temperature in the test box, a water temperature signal is transmitted to the control system 25, the control system 25 controls the working states of the water flow circulating pump 19, the heating device 22 and the refrigerating device 21 according to the water temperature, and the water circulation controller 23 is controlled to display the temperature of water in the test box 1. When the measured water temperature is lower than the set temperature value, the control system 25 controls the water flow circulating pump 19 and the heating device 22 to be started, so that the water flows and circulates to heat the water in the test box. When the measured water temperature is higher than the set temperature value, the control system 25 controls the water flow circulating pump 19 and the refrigerating device 21 to be started so as to cool the water in the test box.
Preferably, the water outlet end of the water supply pipe 5 is positioned at the bottom of the groove of the test box 1, the water outlet pipe 17 and the water inlet pipe 18 are positioned at the bottom of the test box, and water is positioned at the bottom of the test box 1 during water flow replenishment and water circulation, so that the influence on the electronic dial indicator 14 is small.
The pump can select pipeline pump, immersible pump etc. this embodiment is with the underwater pump, and feed pump 5 is located water storage tank 4 bottom, and feed pipe 6 one end stretches into in the test box 1, and drain pump 7 is located inside test box 1, and drain pipe 8 one end stretches into water storage tank 4. For thorough drainage, a recess is provided in one corner of the test chamber 1 for placement of the drain pump 7.
The electronic dial 14 is a precision instrument that is preferably kept in a good environment when not in use, so the present device further contemplates the inflation measuring device as a detachable, adjustable structure. The expansion measuring device comprises a magnetic gauge stand 11, a stay 12, a stay connector 13 and an electronic dial gauge 14. The magnetic gauge stand 11 is adsorbed on the surface of the test box 1 (the outer wall of the test box is made of ferromagnetic materials), and is convenient to install, take down and adjust. The stay bar 12 is a rod with threads, the stay bar connector 13 is a component with two vertical screw holes, the lower part of the vertical stay bar 12 is connected with the magnetic gauge stand 11, the upper part is in threaded connection with the stay bar connector 13, two ends of the transverse stay bar are respectively connected with the stay bar connector 13, the measuring head of the electronic dial indicator 14 faces downwards, the upper part is connected to the stay bar connector 13 at the tail end, the connection length of the stay bar 12 and the stay bar connector 13 is adjustable due to threaded connection, and the sagging of the measuring head of the electronic dial indicator 14 is adjustable. The position of the magnetic gauge stand 11 and the screw connection position of the stay bar 12 and the stay bar connector 13 can be adjusted, and the orientation angle of the screw holes of the stay bar connector 13 enables the measuring bar measuring head of the electronic dial indicator 14 to contact the top of the adjusting rod 27.
In order to facilitate the movement of the device, a test box bottom universal wheel 2 is arranged at the bottom of the test box 1, and the test box bottom universal wheel 2 is provided with a brake structure; the bottom of the water storage tank 4 is provided with a tank bottom universal wheel 9, and the tank bottom universal wheel 9 is provided with a brake structure; the bottom of the water circulation system 16 is provided with a water circulation system universal wheel 24, and the water circulation system universal wheel 24 is provided with a brake structure.
The working steps of the device are as follows:
(1) 9 CBR test pieces were prepared with reference to Highway geotechnical test procedure (JTG E40-2007);
(2) The test box 1, the water storage tank 4 and the water circulation control device 23 are reasonably arranged in a laboratory through all universal wheels;
(3) Placing 9 test pieces into a test box 1 in sequence with reference to the attached drawings;
(4) The magnetic gauge stand 11 is adsorbed on the outer surface of the test box 1, the relative positions of the stay bar 12 and the stay bar connector 13 are adjusted, and the axial angle of the vertical screw hole of the stay bar connector 13 enables the measuring bar of the electronic dial indicator 14 to be vertical to the horizontal plane, and the measuring head touches the top surface of the adjusting rod 27;
(5) Starting the test by the control system 25;
(6) The control system 25 controls the water feeding pump 5 and the water level sensor 15 to be opened, water in the water storage tank 4 flows into the bottom of the test box 1 through the water feeding pipe 6, when the water level meets the test requirement, the water level sensor 15 feeds back information to the control system 25, the control system 25 closes the water feeding pump 5, the control system 25 controls the electronic dial indicator 14 to be opened, and the control system 25 controls the water circulation control device 23 to be opened;
(7) In the test process, the water level sensor 15 monitors the water level change in the test box 1at any time and feeds back the water level change to the control system 25, and when the water level of the test piece is lowered due to water absorption, the water supply pump 5 is turned on, so that the water level is kept constant;
(8) During the test, the water circulation control device 23 is kept open to keep the water temperature in the test chamber 1 constant;
(9) The electronic dial indicator 14 measures the expansion amount of the test piece and feeds information back to the control system 25;
(10) When the test piece soaking time reaches 4 days and nights, the control system 25 automatically ends the test, the control system 25 controls the water circulation device 23 and the electronic dial indicator 14 to be closed, controls the drain pump 7 to be opened, and water flows through the bottom groove of the test box 1, the drain pump 7 and the drain pipe 8 and flows back to the water storage tank 4.
Claims (4)
1. The utility model provides a geotechnical CBR test sample soak device, has test box (1), inflation measuring device, dress sample's test tube (26), and test tube (26) are placed in test box (1), and inflation measuring device is used for measuring the expansion volume of soaking of sample, characterized by: the device is also provided with a water supply and drainage system (3), a water circulation system (16) and a control system (25), wherein the test box (1) is rectangular, a plurality of test cylinders (26) are arranged in the test box, a porous top plate is arranged at the top of a test sample of each test cylinder (26), an adjusting rod (27) is fixed on each porous top plate, the expansion measuring device (10) comprises an electronic dial indicator (14), a measuring head of the electronic dial indicator (14) is positioned at the top of each adjusting rod (27), the electronic dial indicator (14) is electrically connected with the control system (25), and the control system (25) receives and automatically stores the expansion amount measured by the electronic dial indicator (14); the water supply and drainage system (3) comprises a water storage tank (4), a water supply pump (5), a water supply pipe (6), a drainage pump (7), a drainage pipe (8) and a water level sensor (15), wherein the water supply pump (5) is connected with the water supply pipe (6), the water supply pump (5) takes water from the water storage tank (4) to the test tank (1), the drainage pump (7) is connected with the drainage pipe (8), the drainage pump (7) enables water to be drained from the test tank (1) to the water storage tank (4), the water level sensor (15) is arranged in the side wall of the test tank (1), the water level sensor is electrically connected with a control system (25), the control system (25) is electrically connected with the water supply pump (5) and the drainage pump (7), the water level sensor measures water level signals in the test tank, and the signals are transmitted to the control system (25) and the control system (25) controls the water supply pump (5) and the drainage pump (7) to work according to the water level; the water circulation system (16) comprises a water outlet pipe (17), a water inlet pipe (18), a water circulation pump (19), a water temperature sensor (20), a refrigerating device (21), a heating device (22) and a water circulation controller (23), wherein the water outlet pipe (17) and the water inlet pipe (18) are connected with the bottom of the test box (1), the refrigerating device (21) and the heating device (22) are both arranged in the water circulation system (16), the water inlet and the water outlet of the water circulation pump (19) are respectively connected with the water outlet pipe (17) and the water inlet pipe (18), the water temperature sensor (20) is arranged in the test box (1), the water temperature sensor (20) is electrically connected with a control system (25), the control system (25) is connected with the water circulation controller (23), the control system (25) is electrically connected with the water circulation pump (19), the refrigerating device (21) and the heating device (22), the heating device (22) is an electric heating sleeve, the electric heating sleeve is sleeved on the water outlet pipe (17) or the water inlet pipe (18), the refrigerating device (21) is an annular sleeve which wraps the water inlet pipe or the water outlet pipe (17), annular sleeve is filled with condensate, the water temperature sensor (20) measures the test box, the water temperature signal is transmitted to the control system (25), and the control system (25) is controlled by the water circulation pump (22) according to the water temperature signal The refrigerating device (21) is in a working state, and the water circulation controller (23) is controlled to display the temperature of water in the test box (1);
The bottom of the water storage tank (4) is provided with a water tank bottom universal wheel (9), and the water tank bottom universal wheel (9) is provided with a braking structure;
the bottom of the water circulation system (16) is provided with a water circulation system universal wheel (24), and the water circulation system universal wheel (24) is provided with a brake structure.
2. The geotechnical CBR test sample soaking device according to claim 1, wherein: the water supply pump (5) is located at the bottom of the water storage tank (4), one end of the water supply pipe (6) stretches into the test box (1), the drainage pump (7) is located inside the test box (1), and one end of the drainage pipe (8) stretches into the water storage tank (4).
3. The geotechnical CBR test sample soaking device according to claim 2, wherein: the bottom of the test box (1) is provided with a universal wheel (2) at the bottom of the test box, the universal wheel (2) at the bottom of the test box is provided with a braking structure, one corner in the test box (1) is provided with a groove, and the groove is used for placing a drainage pump (7).
4. The geotechnical CBR test sample soaking device according to claim 1, wherein: the expansion measurement device is of a detachable and adjustable structure and comprises a magnetic gauge stand (11), a stay bar (12), a stay bar connector (13) and an electronic dial indicator (14), wherein the magnetic gauge stand (11) is adsorbed on the surface of a test box (1), the stay bar (12) is a threaded bar, the stay bar connector (13) is a component with two vertical screw holes, the lower part of the vertical stay bar (12) is connected with the magnetic gauge stand (11), the upper part of the vertical stay bar is in threaded connection with the stay bar connector (13), two ends of the transverse stay bar are respectively connected with the stay bar connector (13), the measuring head of the electronic dial indicator (14) faces downwards, the upper part of the electronic dial indicator is connected onto the stay bar connector (13) at the tail end, the connecting length of the stay bar (12) and the stay bar connector (13) is adjustable, and the sagging degree of the measuring head of the electronic dial indicator (14) is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011606026.2A CN112629975B (en) | 2020-12-30 | Geotechnical CBR test sample soaking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011606026.2A CN112629975B (en) | 2020-12-30 | Geotechnical CBR test sample soaking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112629975A CN112629975A (en) | 2021-04-09 |
| CN112629975B true CN112629975B (en) | 2024-07-12 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214427090U (en) * | 2020-12-30 | 2021-10-19 | 甘肃畅陇公路养护技术研究院有限公司 | Geotechnical CBR test sample soaking device |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214427090U (en) * | 2020-12-30 | 2021-10-19 | 甘肃畅陇公路养护技术研究院有限公司 | Geotechnical CBR test sample soaking device |
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Inventor after: Zhang Tangyu Inventor after: Bao Dexiang Inventor after: Cao Qingxia Inventor after: Yang Kecheng Inventor after: Ma Lina Inventor after: Zhang Rongling Inventor after: Xue Yanjin Inventor before: Bao Dexiang Inventor before: Cao Qingxia Inventor before: Zhang Tangyu Inventor before: Yang Kecheng Inventor before: Ma Lina Inventor before: Zhang Rongling Inventor before: Xue Yanjin |
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