CN210294142U - Real-time continuous intelligent testing system for water content of roadbed - Google Patents
Real-time continuous intelligent testing system for water content of roadbed Download PDFInfo
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- CN210294142U CN210294142U CN201921204772.1U CN201921204772U CN210294142U CN 210294142 U CN210294142 U CN 210294142U CN 201921204772 U CN201921204772 U CN 201921204772U CN 210294142 U CN210294142 U CN 210294142U
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Abstract
The utility model discloses a real-time continuous intelligent test system of road bed moisture content, this test system are based on the resistivity theory to with wheeled mechanical assembly in order to detect the road bed moisture content, wheeled machinery is including the gyro wheel, test system includes: the detection parts of the four probes are linearly arranged on the roller, and the arrangement directions of the detection parts of the four probes are parallel to the axis of the roller; the data integration device is respectively connected with the four probes and is used for data calculation, analysis and transmission; and the power supply is connected with the data integration device and is used for supplying working current. The utility model discloses can realize the dynamic test of the automatic acquisition of signal, the nondestructive test of roadbed soil and moisture content.
Description
Technical Field
The utility model relates to a soil moisture content test technical field, in particular to road bed moisture content test.
Background
The roadbed is a strip structure which is a road foundation constructed according to a route position and a certain technical requirement, and is a foundation of a railway and a highway, and the roadbed is a linear structure constructed by soil, stone and the like. The roadbed can be divided into three types of soil roadbed, stone roadbed and soil-stone roadbed from the material aspect.
The water content of the filler in the process of compacting the roadbed is an important index influencing the overall quality of the roadbed, and has profound significance for researching the complex characteristics of the compacted soil. The existing roadbed intelligent compaction system is based on a vibration response mechanism between a roadbed structure and a roller of a road roller, and achieves the aim of roadbed compaction quality control by measuring the compaction mechanical property of roadbed soil. However, in the roadbed compaction process, the water content of the filler plays an indispensable role in the compaction quality, so a real-time continuous roadbed water content intelligent test system needs to be established, and the method has an extremely important value for perfecting the roadbed intelligent compaction system.
Methods for measuring the water content of soil bodies are divided into direct measurement methods and indirect measurement methods. The direct measurement method comprises a drying method, an alcohol combustion method and the like, and the traditional measurement methods cannot realize continuous dynamic detection and are relatively limited in measurement range, so that the method is not high in universality in the roadbed compaction process; the indirect measurement method is to measure a certain indirect variable affecting the water content of the soil body and establish a theoretical relation between the variable and the water content, so as to obtain the water content. These methods include neutron irradiation, time domain reflectometry, geological radar, resistivity, and the like. When the neutron radiation method and the time domain reflectometer method are used for measuring the water content of the soil body, the precision requirement is high, the sensor needs to be repeatedly calibrated by professional personnel, and the measurement range is small, so the field practicability is limited. The geological radar detection technology has the defects of low sensitivity, poor visual effect of a water content measurement result and the like on site, so that the technology is difficult to apply and popularize in engineering.
In view of this, it is necessary to develop a technology capable of continuously and accurately measuring the moisture content of the roadbed in real time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a real-time continuous intelligent test system of road bed moisture content to real-time, continuous, accurate measurement road bed moisture content.
In order to achieve the above object, on the one hand, the utility model provides the following technical scheme:
the utility model provides a real-time continuous intelligent test system of road bed moisture content, is based on the resistivity theory to assemble in order to detect road bed moisture content with wheeled machinery, wheeled machinery is including the gyro wheel, test system includes: the detection parts of the four probes are linearly arranged and are arranged on the roller at equal intervals, and the arrangement direction of the detection parts of the four probes is parallel to the axis of the roller; the data integration device is respectively connected with the four probes and is used for data calculation, analysis and transmission; and the power supply is connected with the data integration device and is used for supplying working current.
On the other hand, the utility model provides a following technical scheme:
a real-time continuous intelligent testing method for roadbed moisture content is applied to a testing system and comprises the following steps: when a set of electrode contacts the soil body, the soil body advances along with the roller of the road roller, a probe a, a probe b, a probe c and a probe d in a set of electrode contact roadbed soil with different water contents, the probe a and the probe d are connected with a constant current source, the voltage Ubc between the probe c and the probe d and the potential difference Us at two ends of a standard resistor Rs are measured through a data integration device, and therefore the test resistance can be calculated:
according to the formula:
dab and dbc are respectively the distance between the probe a and the probe b and the distance between the probe b and the probe c, dab ═ dcd ═ ndbc, wherein n is a positive integer; calculating the resistivity rho of the roadbed soil; and determining the water content of the roadbed soil according to the corresponding relation between the pre-calibrated soil body resistivity and the water content, thereby obtaining the water content of the soil body at any position of the roadbed.
To sum up, because the probe follows the gyro wheel and removes, the utility model discloses utilize resistivity theory (Wenner theory), can realize the real-time, continuous measurement to subgrade soil moisture content, the probe is fixed and can bear the same vibratory pressure with the gyro wheel on the gyro wheel to for guaranteeing the connectivity with the soil body, the top shape system is 1-2 mm's circular arch, real-time dynamic test moisture content, the precision is very improved, synthesize the accuse road bed compaction quality, thereby can realize the automatic acquisition of signal, the nondestructive test of subgrade soil and the dynamic test of moisture content.
Drawings
FIG. 1 is a schematic diagram of an apparatus of an embodiment of the system of the present invention;
fig. 2 is a schematic diagram of a probe according to an embodiment of the system of the present invention;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and fig. 2, the system of the present invention includes at least one set of electrodes (four probes) 1, a data integration device 10 for intelligent moisture content testing, a constant current source 11 as a power source, and a visual mobile device 12 for acquiring data and sending operation instructions in real time, wherein the probes 1 and the constant current source 11 are electrically connected to the data integration device 10 through wires 7. The data integration device 10 is provided with a wireless communication module and is in wireless communication connection with the visual mobile equipment 12.
Fig. 1 also shows the foundation soil 13 in order to clarify the contact of the probe with the foundation soil. When testing the moisture content, four probes 1 fully contact the tested road foundation soil 13 because the top ends (outer ends) are raised.
The group of electrodes 1 comprises four probes a, b, c and d, the four probes 1 have certain strength, are fixed on a roller 8 of the road roller through preset holes, can bear the pressure in the advancing process of the road roller and the vibration pressure during vibration compaction, and the top end of each probe 1 is provided with a circular bulge with the diameter of 1-2mm to ensure that the probe fully contacts the roadbed soil 13.
As shown in fig. 2 in detail, an insulating isolation layer 2 is disposed between the probe a, the probe b, the probe c, the probe d and a predetermined hole of the roller 8, and preferably, the insulating isolation layer 2 is made of a hard insulating material such as teflon. The outer ends of the probe a, the probe b, the probe c and the probe d protrude out of the inner surface of the roller 8, an insulating gasket 3 is arranged at the inner surface of the roller, the roller is fixed by a nut 4, a wiring terminal 5 is arranged, then the wiring terminal 5 is fixed by a nut 6, the wiring terminal 5 is connected with one end of a signal wire 7, and the four signal wires 7 are a plurality of wound copper core wires in a four-core shielded cable. The probes a, b, c and d are distributed on the roller 8 in parallel, preferably, the distance between adjacent probes in the four probes is equal, and the connecting line of the four probes is parallel to the axis of the roller 8, so as to ensure that the four probes 1 contact the roadbed soil 13 at the same time. Preferably, an insulating coating 14 having a thickness of about 2mm is applied to the outer surface of the roller 8 within a test influence range of 100cm long and 50cm wide except for the outer end surface of the probe 1, so as to exclude the influence of the outer surface of the roller 8 on the test potential. Of course, other ranges of the insulating coating 14 are also possible as an option.
Further, the signal wire 7 is arranged in the hard PE pipe to avoid exposure, and the hard PE pipe is arranged on the inner surface of the roller 8 through a hoop.
Further, the probe 1 is made of titanium-iron alloy with good conductivity, and the cross section of the probe is made of a special shape: the large diameter of the outer part and the small diameter of the inner part are beneficial to bearing the impact vibration pressure and keeping the probe 1 in full contact with the roadbed soil 13. Each probe 1 is a screw structure with the length of 60mm, the diameter of the outer side section of 20mm and the inner side section of 6mm, the outer side length is 12mm, the inner side length is 48mm, the length of the part extending out of the inner surface of the roller 8 is 20mm, and the length of the thread part is 20 mm. Furthermore, the outer insulating layer of the probe 1 also adopts a special shape, and the transition form is properly changed at the contact position of the insulating layer and the probe in order to reduce the influence of shear damage. Furthermore, an insulating spacer 3 is arranged on the inner surface part of the roller 8, which extends out of the roller, so as to prevent the probe and the roller from forming an equipotential body, and then the nut 4, the connecting terminal 5 and the nut 6 are arranged in sequence. The connecting terminal 5 is in a copper ring shape and is welded with the signal wire 7.
The signal wire 7 connecting the probe 1 and the data integration device 10 is preferably a single stranded pure copper wire enameled wire, the specific specification is preferably 4 x 0.75 individual shielding signal wires, the outer side of each shielding wire is a copper winding wire, the individual shielding capability is improved, the outer side is a silica gel skin protection, the total thickness is 0.3mm, and the high strength, the superconductivity and the high flexibility of the cable are ensured.
Test signals of the test probe 1 are collected to a signal input port of the data integration device 10 through the lead 7, and the data integration device 10 has the functions of collecting, calculating, analyzing and wirelessly transmitting test data of roadbed soil moisture content. The data integration device 10 is preferably an integrated circuit, and the integrated circuit mainly comprises a standard resistor, a voltmeter, an ammeter (necessary device for Wenner theory implementation) and a wireless transmission module. The voltmeter tests the standard resistance and the potential of the resistance of the probes b and c contacting the roadbed soil 13, the ammeter tests the current passing through the roadbed soil resistance, and the wireless transmission module transmits the data to the visual mobile device 12. The constant current source 11 is preferably a nickel-metal hydride battery, and is connected to the data integration device 10 through the conductive connector 9 for supplying a constant current to the data integration device 10. However, the application program APP (the development process of the APP commonly used in the mobile device is already mature, and is not described herein), and after authorized approval, the moisture content of the roadbed soil 13 can be tested by clicking "continuous test".
The APP for testing the water content can be provided with two buttons, a 'connection device' provides a real-time connection authorization function, and a 'continuous measurement' can provide a function that data is automatically recorded into a Resistity folder. The moisture content display interface can realize real-time visualization of the moisture content.
The data integration device 10 and the constant current source 11 are disposed in a resin square box with a suitable size, wherein the two ends of the box wall of the data integration device 10 are respectively provided with a preset hole, and only one end of the box wall of the constant current source 11 is provided with a preset hole which is specially used for fixing the conductive connector 9, preferably a four-wire connector. The two cubes are secured to the inner surface of the roller 8 by clips.
In the embodiment, the resistivity of the soil body is tested based on the Wenner theory, a probe a, a probe b, a probe c and a probe d are inserted into a roller 8 of the road roller, and according to the theory, when the probes contact the soil body, constant current is applied between the probe a and the probe d, and voltage is generated on a standard resistor and the other two electrodes. The detailed steps of the specific operation are as follows:
when the probe a, the probe b, the probe c and the probe d contact roadbed soil 13 with different water contents when the roller of the road roller moves forward, the visible mobile equipment 12 is connected, a continuous measurement instruction button on the visible mobile equipment is clicked to connect the probe a and the probe d with the constant current source 11, the voltage Ubc between the probe c and the probe d and the potential difference Us at two ends of the standard resistor Rs are measured through a voltmeter in the data integrated circuit 10, and therefore the test resistor can be calculated
According to the formula:
typically dab ═ dcd ═ ndbc, where n is a positive integer; programming in an integrated circuit to calculate the resistivity rho of the roadbed soil.
The relation of the resistivity and the water content of the soil body is influenced by the temperature, so that the resistivity-water content relation taking the temperature influence into consideration is established as follows:
ω＝aln[b(0.45+1.4e-t/27)ρ]
wherein, a and b are resistivity-water content relation parameters, are influenced by different soil properties, and are subjected to calibration tests of soil samples with at least four equal-difference water contents (such as 4%, 6%, 8%, 12% and the like) under given compaction at the room temperature of 25 ℃ before construction to determine the parameters a and b; t is the real-time temperature of the on-site pressure, unit ℃; rho is the resistivity of the soil body obtained through the test of the invention.
And finally, determining the water content of the roadbed soil according to the corresponding relation between the pre-calibrated soil Resistivity and the water content, thereby obtaining the water content of the soil at any position of the roadbed, and storing the water content in a resistance folder for uploading and summarizing.
To sum up, the utility model discloses realize the real-time continuous intelligent test of road bed moisture content based on the Wenner theory, owing to adopt the probe of certain hardness, can be under the vibration load direct contact roadbed soil, improve the measuring accuracy of roadbed soil moisture content greatly, have real-time, continuous, not damaged, advantage such as visual, further combine together moisture content and intelligent compaction system. In particular, the probe is reasonable in shape design, good in insulativity with the roller and capable of reducing the influence of test errors. The mobile device can remotely control the test system, and then control the compaction quality. The utility model discloses it is easy and simple to handle, the test range no longer limits, greatly improves road bed compaction quality control's level.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Claims (13)
1. The utility model provides a real-time continuous intelligent test system of road bed moisture content, is based on the resistivity theory to assemble in order to detect road bed moisture content with wheeled machinery, wheeled machinery is including the gyro wheel, its characterized in that, test system includes:
the detection parts of the four probes are linearly arranged on the roller, and the arrangement directions of the detection parts of the four probes are parallel to the axis of the roller;
the data integration device is respectively connected with the four probes and is used for data calculation, analysis and transmission;
and the power supply is connected with the data integration device and is used for supplying working current.
2. The testing system of claim 1, wherein the four probes have their detecting portions arranged on the roller in a linear arrangement at equal intervals, and the arrangement direction of the four probes is parallel to the axis of the roller.
3. The test system according to claim 1 or 2, wherein the wheeled machine is a road roller, the roller is a roller of the road roller for compacting a roadbed, and the data integration device and the power supply are positioned inside the roller.
4. The test system of claim 3, wherein a portion of the probe is embedded in the roller and the detection site protrudes from an outer surface of the roller.
5. The test system according to claim 4, wherein four probes are in a round bar structure, the outer surface of the roller is provided with a deep hole, the probes are fixedly inserted into the deep hole, and the detection parts at the outer ends of the probes protrude out of the outer surface of the roller.
6. The test system of claim 5, wherein the probe comprises at least two parts: the outer diameter of the inner part is smaller than that of the outer part, and the structure of the deep hole corresponds to that of the probe;
the inner end of the probe protrudes out of the inner surface of the roller and is connected with the data integration device.
7. The test system as claimed in claim 6, wherein an insulating spacer, a first nut, a connecting terminal and a second nut are sequentially disposed at an inner end of the probe, the first nut is used for fixing the insulating spacer on the inner surface of the roller, the second nut is used for fixing the connecting terminal on the probe, and the connecting terminal is used for connecting with the data integration device.
8. The test system of claim 7, wherein a hard insulating material is disposed in the deep hole between the probe and an inner wall of the deep hole.
9. The test system of claim 8, wherein the hard insulating material is teflon.
10. The test system of claim 9, wherein at least a portion of a surface of the roller around the probes is covered with an insulating layer to exclude potential effects of the roller surface on testing.
11. The test system of claim 1 or 2, wherein the data integration device is an integrated circuit, and is used for accurately calculating resistivity and obtaining roadbed moisture content according to the calibrated relation between the soil body resistivity and the moisture content.
12. The test system according to claim 1 or 2, wherein the data integration device has a computing function and a wireless transmission function, so that moisture content visualization is achieved through mobile equipment, wireless connection is established with the intelligent compaction cloud platform, and the moisture content is uploaded to the cloud platform.
13. A test system as claimed in claim 1 or 2, wherein the power supply is a nickel-hydrogen rechargeable battery pack providing a constant current source for the entire system.
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| CN201921204772.1U CN210294142U (en) | 2019-07-29 | 2019-07-29 | Real-time continuous intelligent testing system for water content of roadbed |
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| CN201921204772.1U CN210294142U (en) | 2019-07-29 | 2019-07-29 | Real-time continuous intelligent testing system for water content of roadbed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243875A (en) * | 2019-07-29 | 2019-09-17 | 石家庄铁道大学 | The real-time continuous intelligent test system of roadbed moisture content and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243875A (en) * | 2019-07-29 | 2019-09-17 | 石家庄铁道大学 | The real-time continuous intelligent test system of roadbed moisture content and method |
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