CN221124178U - Quality and height measuring device for undisturbed soil shrinkage test - Google Patents
Quality and height measuring device for undisturbed soil shrinkage test Download PDFInfo
- Publication number
- CN221124178U CN221124178U CN202322481636.XU CN202322481636U CN221124178U CN 221124178 U CN221124178 U CN 221124178U CN 202322481636 U CN202322481636 U CN 202322481636U CN 221124178 U CN221124178 U CN 221124178U
- Authority
- CN
- China
- Prior art keywords
- undisturbed soil
- electronic balance
- range finder
- laser range
- bearing plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002689 soil Substances 0.000 title claims abstract description 80
- 238000012360 testing method Methods 0.000 title claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model provides a quality and height measuring device for undisturbed soil shrinkage test. The measuring device comprises an electronic balance base, an undisturbed soil bearing plate, a measuring bracket and a laser range finder, wherein the undisturbed soil bearing plate is fixed in the middle of the top surface of the electronic balance base, a plurality of undisturbed soil bearing holes are formed in the undisturbed soil bearing plate, the laser range finder is arranged above the electronic balance base through the measuring bracket, a scanning probe of the laser range finder faces the undisturbed soil bearing plate, and the laser range finder is arranged on the measuring bracket through a rotating motor. According to the utility model, the mass of the undisturbed soil sample can be monitored in real time through the electronic balance, the height of the undisturbed soil sample is measured in real time through the laser range finder, and the measured data is displayed or integrally output, so that a tester can conveniently calculate the linear shrinkage and the water content of the undisturbed soil sample, the shrinkage coefficient is calculated, and the accuracy of a measurement result is improved.
Description
Technical Field
The utility model relates to the field of geotechnical engineering investigation, soil mechanics and geotechnical test, in particular to a quality and height measuring device for undisturbed soil shrinkage test, which is used for measuring undisturbed soil quality and height through combination of laser scanning and a balance and calculating a shrinkage coefficient conveniently.
Background
Soil mechanical properties are one of the key parameters indispensable in the design and construction process of civil construction engineering. Undisturbed soil refers to a soil sample which is not subjected to any treatment and improvement in a natural state, and the shrinkage coefficient is an important index for representing the volume change caused by the change of the moisture content of the soil. The current common measurement method for the shrinkage coefficient of undisturbed soil is mainly based on indirect measurement of the change of the height and the quality of undisturbed soil; the existing measuring process for the undisturbed soil height is to measure the height of a soil sample by a dial indicator so as to determine the height change of the undisturbed soil sample and calculate the linear shrinkage of the undisturbed soil; and then measuring the mass of the pattern by a balance, calculating the water content, and calculating the shrinkage coefficient by combining the water content and the linear shrinkage.
The existing height measurement only assumes that the soil sample is an homogeneous mass, and when the changes of all parts in the shrinkage process are consistent, the obtained test parameters are effective, but most of soil bodies are uneven bodies, and the conditions are difficult to meet, so that the accuracy of the measurement result is affected, and the measurement result is inaccurate and reliable. In addition, in the quality and height measurement process, manual operation is needed, recording can be completed only in working time, and the test period is prolonged.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a mass and height measuring device for undisturbed soil shrinkage test, which measures the height and the mass of undisturbed soil through the combined use of laser scanning and a balance, and increases the accuracy of measurement.
The utility model provides a quality and height measuring device for an undisturbed soil shrinkage test, which comprises an electronic balance base, an undisturbed soil bearing plate, a measuring bracket and a laser range finder, wherein the undisturbed soil bearing plate is fixed in the middle of the top surface of the electronic balance base, a plurality of undisturbed soil bearing holes are formed in the undisturbed soil bearing plate, the laser range finder is arranged above the electronic balance base through the measuring bracket, a scanning probe faces the undisturbed soil bearing plate, and the laser range finder is arranged on the measuring bracket through a rotating motor.
The utility model further adopts the technical scheme that: the measuring support comprises four support rods, a support plate positioned at the top of the support rods and a protective cover positioned around the support plate, wherein the laser range finder is fixedly installed in the middle of the support plate, the protective cover adopts a transparent square cover body, the upper parts of the four support rods are enclosed, the top of the protective cover is fixed on the bottom surface of the support plate, and the laser range finder is completely covered.
The utility model has the preferable technical scheme that: the electronic balance base is internally provided with a measuring module and a processing module which are in communication connection, the electronic balance base is provided with a display screen, and the signal output end of the laser range finder is in communication connection with the processing module of the electronic balance base.
The utility model has the preferable technical scheme that: the undisturbed soil bearing plate is a porous plate; the middle part of the top surface of the electronic balance base is correspondingly provided with an installation groove of the undisturbed soil bearing plate, and the undisturbed soil bearing plate is embedded into the installation groove.
The utility model has the beneficial effects that:
According to the utility model, the laser scanning and balance measurement technology is combined, the mass of the undisturbed soil sample can be monitored in real time through the electronic balance, the height of the undisturbed soil sample is measured in real time through the laser range finder, and the measured data are displayed or integrally output, so that a tester can conveniently calculate the linear shrinkage and the water content of the undisturbed soil sample, the shrinkage coefficient is calculated, and the accuracy of a measurement result is improved; the device can realize automatic measurement, is simple and convenient to measure, is easy to implement, and reduces the operation difficulty and the time cost; according to the measuring bracket, the lower part is set to be in a ventilation state, so that a sample in the measuring bracket can be air-dried in a normal-temperature natural environment, deviation of a test result caused by increase of moisture in a closed environment is reduced, and the laser range finder can be protected by transparent acrylic at the top.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present utility model;
FIG. 2 is a schematic view of the structure of the measuring bracket in the present utility model;
FIG. 3 is a control schematic of the present utility model;
fig. 4 is a schematic diagram of the laser range finder according to the present utility model.
Wherein: 1-electronic balance base 1, 2-undisturbed soil bearing plate, 200-undisturbed soil bearing, 3-measuring support, 300-supporting rod, 301-supporting plate, 302-protective cover, 4-laser range finder, 400-scanning probe, 5-rotating motor and 6-undisturbed soil sample.
Detailed Description
The utility model is further described below with reference to the drawings and examples. Figures 1 to 4 are drawings of embodiments, drawn in a simplified manner, for the purpose of clearly and concisely illustrating embodiments of the present utility model. The following technical solutions presented in the drawings are specific to embodiments of the present utility model and are not intended to limit the scope of the claimed utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present utility model.
The embodiment provides a mass and height measuring device for undisturbed soil shrinkage test, which comprises an electronic balance base 1, an undisturbed soil bearing plate 2, a measuring bracket 3 and a laser range finder 4, as shown in figures 1 and 2; the undisturbed soil bearing plate 2 is a porous plate, and a plurality of undisturbed soil bearing holes 200 are formed in the porous plate; the middle part of the top surface of the electronic balance base 1 is correspondingly provided with a mounting groove of the undisturbed soil bearing plate 2, and the undisturbed soil bearing plate 2 is embedded into the mounting groove. The laser range finder 4 is arranged above the electronic balance base 1 through the measuring bracket 3, the scanning probe 400 of the laser range finder faces the undisturbed soil bearing plate 2, and the laser range finder 4 is an existing laser range finder with a self-rotation function; the measuring bracket 3 comprises four supporting rods 300, a supporting plate 301 positioned at the top of the supporting rods and a protective cover 302 positioned around the supporting plate 301, the laser range finder 4 is fixedly installed in the middle of the supporting plate 301, the protective cover 302 is a transparent square cover body, the upper parts of the four supporting rods 300 are enclosed, the top of the protective cover is fixed on the bottom surface of the supporting plate 301, and the laser range finder 4 is completely covered. The laser distance measuring instrument 4 is mounted on the measuring bracket 3 through a rotating motor 5.
The embodiment provides a quality and height measuring device for an undisturbed soil shrinkage test, as shown in fig. 1 to 3, a measuring module, a processing module and a display screen which are in communication connection are arranged in an electronic balance base 1, and the measuring module acquires the quality of an undisturbed soil sample placed on an undisturbed soil bearing plate 2 in real time, transmits the measuring result to the processing module and displays the measuring result through the display screen; the signal output end of the laser range finder 4 is in communication connection with the processing module of the electronic balance base 1, measures the distance between the emission point and the top surface of the undisturbed soil sample in real time, and transmits the measurement result to the processing module for carrying out; the processing module can adopt the existing calculation module of the laser range finder, the height of the sample can be obtained through measuring the distance, the measured height of the range finder can be directly subtracted from the distance between the measured distance and the base, and in order to ensure that the height of the sample can be measured accurately, the average height can be obtained through multiple times of measurement.
In the embodiment, the laser range finder 4 can be controlled to perform 360 ° rotation ranging along the maximum offset angle θ max according to the angle resolution α, the maximum offset angle θ ma of the laser range finder 4 is to align the center of the sample with the center position of the laser radar, measure the vertical distance l from the center point to the center point of the laser radar, and calculate the maximum offset angle θ max required by the laser radar to measure the sample according to the vertical distance l and the original radius r of the undisturbed soil sample:
The laser range finder 4 can be set to perform rotary ranging along the maximum offset angle theta max according to the angle resolution alpha, after 360-degree periodic ranging is completed, the angle of theta max/x+1 is stepped to the circle center, the rotary ranging is performed again according to the angle resolution alpha, and the 360-degree periodic ranging … … is completed, and repeated x times of ranging are performed, wherein x is more than or equal to 10, so that the included angle theta i of the laser range finder in each ranging can be calculated, and the calculated view is shown in fig. 4:
θi＝θmax-y(θmax/x+1)
Wherein: x is the number of measurements; y is the number of steps;
x and y are integers, y is 0, x+1.
Setting 19 times of distance measurement, wherein the actual use is 20 circles, and each time of stepping theta max/20;
The theta value of the outermost ring is theta i＝θmax-y(θmax/x+1)＝θi＝θmax-0×(θmax/20)＝θmax
Second circle (first step toward circle center) distance measurement sampling value theta i＝θmax-y(θmax/x+1)＝θi＝θmax-1×(θmax/20
Third circle (step toward circle center for the second time) of distance measurement sampling value theta i＝θmax-y(θmax/x+1)＝θi＝θmax-2×(θmax/20
……
Theta i＝θmax-y(θmax/x+1)＝θi＝θmax-19×(θmax/20 of 20 th turn (nineteenth step toward center) of ranging samples.
In the embodiment, the processing module may use an existing control module to calculate the height H of the sample according to a conventional calculation formula:
hi＝li·cosθi
Wherein: l i is the distance measurement of any point i on the top surface of the undisturbed soil sample scanned by the laser distance meter at the moment t once;
θ i is the laser included angle of single ranging sampling of the laser range finder at the moment t;
h 1、h2、h3、h4…hi is 1, 2, 3 and 4 … i of the time t laser distance measuring instrument to the top surface of the undisturbed soil sample respectively
The vertical distance of the points;
Finally, the original height H 0 of the original soil sample is combined to calculate the linear shrinkage delta st of the original soil sample at different moments:
δst＝((H0-Ht)/H0)*100
Wherein H t is the height of the undisturbed soil sample at time t.
The electronic balance base can measure the mass of the undisturbed soil sample, and calculate the water content w t of the undisturbed soil sample at a plurality of moments according to the following formula; and drawing a relation curve of the linear shrinkage and the water content at different moments by taking the linear shrinkage as an ordinate and the water content as an abscissa, and calculating the shrinkage coefficient lambda s of the undisturbed soil sample, wherein the calculation process is as follows:
wt＝(mt/m0-1)*100
λs＝Δδst/Δw
Wherein: w t is the water content of the undisturbed soil sample at the time t,%;
m 0 is the dry soil mass of the undisturbed soil sample, and the unit is: g;
m t is the wet soil mass of the undisturbed soil sample at the time t, and the unit is: g;
Δδst is the difference (%) between the shrinkage of the phase I2 line on the shrinkage curve;
Δw is the difference (%) between the two water contents corresponding to Δδst.
The foregoing description is of one embodiment of the utility model and is thus not to be taken as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.
Claims (4)
1. A quality and high measuring device for undisturbed soil shrinkage test, its characterized in that: the measuring device comprises an electronic balance base (1), an undisturbed soil bearing plate (2), a measuring bracket (3) and a laser range finder (4), wherein the undisturbed soil bearing plate (2) is arranged in the middle of the top surface of the electronic balance base (1), a plurality of undisturbed soil bearing holes (200) are formed in the undisturbed soil bearing plate, the laser range finder (4) is arranged above the electronic balance base (1) through the measuring bracket (3), a scanning probe (400) faces the undisturbed soil bearing plate (2), and the laser range finder (4) is arranged on the measuring bracket (3) through a rotating motor (5).
2. A mass and height measurement device for undisturbed soil shrinkage test as defined in claim 1, wherein: the measuring support (3) comprises four supporting rods (300), a supporting plate (301) positioned at the top of the supporting rods and a protective cover (302) positioned around the supporting plate (301), the laser range finder (4) is fixedly installed in the middle of the supporting plate (301), the protective cover (302) is a transparent square cover body, the upper parts of the four supporting rods (300) are enclosed, the top of the protective cover is fixed on the bottom surface of the supporting plate (301), and the laser range finder (4) is completely covered.
3. A mass and height measurement device for undisturbed soil shrinkage test as claimed in claim 1 or claim 2, wherein: the electronic balance is characterized in that a measuring module and a processing module which are in communication connection are arranged in the electronic balance base (1), a display screen is arranged on the electronic balance base (1), and the signal output end of the laser range finder (4) is in communication connection with the processing module of the electronic balance base (1).
4. A mass and height measurement device for undisturbed soil shrinkage test as defined in claim 1, wherein: the undisturbed soil bearing plate (2) is a porous plate; the electronic balance is characterized in that an installation groove corresponding to the undisturbed soil bearing plate (2) is formed in the middle of the top surface of the electronic balance base (1), and the undisturbed soil bearing plate (2) is embedded into the installation groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322481636.XU CN221124178U (en) | 2023-09-13 | 2023-09-13 | Quality and height measuring device for undisturbed soil shrinkage test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322481636.XU CN221124178U (en) | 2023-09-13 | 2023-09-13 | Quality and height measuring device for undisturbed soil shrinkage test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221124178U true CN221124178U (en) | 2024-06-11 |
Family
ID=91341090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322481636.XU Active CN221124178U (en) | 2023-09-13 | 2023-09-13 | Quality and height measuring device for undisturbed soil shrinkage test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221124178U (en) |
-
2023
- 2023-09-13 CN CN202322481636.XU patent/CN221124178U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105571758B (en) | The dilatometer of constant volume method measurement expansive force | |
| CN210833527U (en) | Measuring instrument suitable for slope | |
| CN110763110A (en) | Three-jaw internal diameter ruler automatic calibration device | |
| CN221124178U (en) | Quality and height measuring device for undisturbed soil shrinkage test | |
| CN220084014U (en) | Land gradient measuring device for land engineering | |
| CN214310045U (en) | Sand content apparatus metrological verification device | |
| CN111650072A (en) | Device for rapidly measuring water content of sand and stone and using method thereof | |
| CN208847114U (en) | A kind of battery parameter test device | |
| CN209706913U (en) | Adjustable groundwater level monitoring device | |
| CN111089879A (en) | Indoor testing arrangement of soil body resistivity with adjustable size | |
| CN212674691U (en) | Quick determination device for water content of sand and stone | |
| CN111271052A (en) | Combined device and method for measuring pile depth, pile diameter and pile hole perpendicularity | |
| CN108548756A (en) | Deposit unit weight measuring device and method | |
| CN109901245A (en) | A kind of comprehensive wind speed calibrating installation of Atmospheric Survey | |
| GB2092308A (en) | Concrete Workability Meter | |
| CN117030783A (en) | Undisturbed soil shrinkage coefficient measuring device and method | |
| CN110398222B (en) | Leveling angle and erecting angle measuring method, device and system | |
| CN114993162A (en) | Device and method for measuring circumferential strain and axial stress of grouting material | |
| CN207148099U (en) | Automatically determine retractometer | |
| CN210180515U (en) | Measuring device for wave profile | |
| CN111060134B (en) | Device for measuring follow-up error of magnetic heading sending device | |
| CN221078452U (en) | Indoor rock test piece measuring device | |
| CN112710549A (en) | Non-contact type rock-soil triaxial test piece body strain testing device | |
| CN220170241U (en) | Gradient detection device | |
| CN216049615U (en) | Water-swelling rock-soil cylinder perimeter creep measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant |