CN110031395B - Transverse force coefficient testing method and road surface water film thickness control method - Google Patents
Transverse force coefficient testing method and road surface water film thickness control method Download PDFInfo
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- CN110031395B CN110031395B CN201910333672.7A CN201910333672A CN110031395B CN 110031395 B CN110031395 B CN 110031395B CN 201910333672 A CN201910333672 A CN 201910333672A CN 110031395 B CN110031395 B CN 110031395B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/084—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention discloses a system and a method for testing a transverse force coefficient, a water spraying device and a method for controlling the thickness of a road surface water film. The method for controlling the thickness of the road surface water film for the transverse force coefficient test comprises the following steps: detecting the structural depth TD of the tested pavement; driving a water spraying device on the test pavement for a certain distance according to the water spraying amount of 5 +/-0.5L/s and the preset speed, and measuring the width b of a water band left on the test pavement by the water sprayed by the water spraying device; calculating the water spraying quantity Q required by reaching the preset water film thickness according to a formula; and adopting the water spraying device to run at the preset speed and spray water according to the water spraying quantity Q to obtain a water film with preset thickness. The method for controlling the thickness of the road surface water film for testing the transverse force coefficient can control the thickness and the water spraying amount of the water film according to the road surface structure, and reduce or even eliminate the influence of the water film thickness on the SFC test value of the transverse force coefficient.
Description
Technical Field
The invention relates to the technical field of pavement testing, in particular to a transverse force coefficient testing method and a road surface water film thickness control method.
Background
For the determination of the SFC value of the transverse force coefficient of the road surface, a transverse force coefficient test system introduced in a national standard system is an SCRIM system in the UK, and is used as a supplement of large-scale equipment in practical application, a Mu-meter friction coefficient test system and a test method are also included in the specification in China, and the application is common in recent years. Both the SCRIM system and the Mu-meter system require manual watering in front of the test wheel in the test process to wet the road surface, so that the most unfavorable driving state in rainy days is simulated, and meanwhile, in order to ensure that the test condition is stable, certain requirements are provided for the thickness of a water film of the road surface in the test process. In the practical application process, through a large number of comparison tests, the fact that the magnitude of the water spraying amount in front of the test wheel has a certain influence on the measured value of the transverse force coefficient SFC is found, and generally, the larger the water spraying amount is, the lower the value of the transverse force coefficient SFC is, and the smaller the water spraying amount is, the higher the value of the transverse force coefficient SFC is.
At present, the water spraying mode of the domestic transverse force testing system mainly comprises pressurized water spraying and automatic water spraying. Wherein the pressurized water spray is mainly used for spraying water to the front of the test wheel in a water pump pumping mode, and is mostly applied to an SCRIM system. The water pump is not arranged in the self-flowing mode, water flows to the front of the test wheel automatically through the water spraying opening by water pressure, and the self-flowing water meter is mainly applied to a Mu-meter system. However, in both the pressurized water spraying mode and the artesian water mode, the control of the water spraying amount is random, the amount of the pressurized water is influenced by the power of the water pump, the amount of the artesian water is influenced by the water level height of the waterwheel, the thickness of the water film on the road surface cannot be controlled, the water sprinkling amount cannot be strictly controlled, and the influence of the thickness of the water film on the SFC test value cannot be eliminated.
In addition, the road surface structure depths of different structure types are different, the same water amount is sprayed to the road surfaces with different structure depths, the formed water film thickness is different, and the water spraying amount is not controlled differently when the domestic detection unit carries out transverse force coefficient test on the road surface structures with different forms at present, so that the water film thickness cannot be controlled.
Disclosure of Invention
Based on the above, the present invention needs to provide a road surface water film thickness control method for lateral force coefficient test, which can control the water film thickness and the water spraying amount according to the road surface structure, and reduce or even eliminate the influence of the water film thickness on the lateral force coefficient SFC test value.
The invention also provides a transverse force coefficient testing method.
The invention also provides a water spraying device for testing the transverse force coefficient.
The invention also provides a transverse force coefficient testing system.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a road surface water film thickness control method for a transverse force coefficient test comprises the following steps:
detecting the structural depth TD of the tested pavement;
driving a water spraying device on the test pavement for a certain distance according to the water spraying amount of 5 +/-0.5L/s and the preset speed, and measuring the width b of a water band left on the test pavement by the water sprayed by the water spraying device;
calculating the water injection quantity Q required for reaching the preset water film thickness according to the following formula:
wherein v is the running speed of the water spraying device, km/h; delta is the thickness of the water film, mm; d is the maximum nominal grain diameter of the sand used for detecting the structural depth TD of the tested pavement, and is mm; b is the width of the water band m; TD is the depth of construction, mm;
and adopting the water spraying device to run at the preset speed and spray water according to the water spraying quantity Q to obtain a water film with preset thickness.
In some embodiments, the method for detecting the structural depth TD of the test pavement comprises: the test was carried out according to T0961-1995 of Standard on-site test of road pavements (JTG E60-2008).
In some embodiments, when the width b of the water belt left on the test road surface by the water sprayed by the water spraying device is measured, the driving speed of the water spraying device needs to be stabilized at the preset speed.
In some of these embodiments, the water film thickness δ is 0.5mm and the maximum nominal particle diameter d is 0.3 mm.
The invention also provides a transverse force coefficient testing method, which adopts the road surface water film thickness control method for the transverse force coefficient testing to control the water spraying device to run at the preset speed and spray water according to the preset water spraying quantity Q to obtain a water film with the preset thickness, and then the transverse force coefficient testing is carried out.
The invention also provides a water spraying device for testing the transverse force coefficient, which comprises:
a water supply unit;
the water spraying component comprises a water spraying pipe and a water spraying nozzle arranged on the water spraying pipe, and the water spraying pipe is communicated with the water supply component;
a pressing member attached to the water spray pipe;
a flow control member mounted to the spout and positioned between the spout and the pressurizing member.
In some embodiments, the water spraying nozzle of the water spraying part is in a fishtail shape, and the size of the water outlet of the water spraying nozzle is larger than that of the water inlet.
In some embodiments, the water flow adjusting range of the pressurizing part is 1m3/h-60m3And h, the water flow control range of the flow control component is 0L/s-20L/s.
In some embodiments, the water supply part comprises a vehicle body and a water tank mounted on the vehicle body.
The invention also provides a transverse force coefficient testing system which comprises the water spraying device for testing the transverse force coefficient.
Drawings
FIG. 1 is a schematic structural diagram of a water spraying apparatus for transverse force coefficient test according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lateral force coefficient testing apparatus according to a preferred embodiment of the invention.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Examples
The invention provides a road surface water film thickness control method for a transverse force coefficient test, which is used for controlling the water film thickness of a test road surface during the transverse force coefficient test so as to ensure the accuracy of test data, and comprises the following steps:
detecting the structural depth TD of the tested pavement;
driving the water spraying device on a test road surface for a certain distance according to the water spraying amount of 5 +/-0.5L/s and the preset speed, and measuring the width b of a water band left on the test road surface by water sprayed by the water spraying device;
calculating the water injection quantity Q required for reaching the preset water film thickness according to the following formula:
wherein v is the running speed of the water spraying device, km/h; delta is the thickness of the water film, mm; d is the maximum nominal grain diameter of the sand used for detecting the structural depth TD of the tested pavement, and is mm; b is the width of the water band m; TD is the depth of construction, mm;
and (3) adopting the water spraying device to run at a preset speed and spray water according to the water spraying quantity Q to obtain a water film with a preset thickness.
The thickness of the water film is the requirement of test specification, delta is generally 0.5mm, and the maximum nominal particle size d required by the specification is 0.3 mm. The traveling speed of the water jet device was set to 50km/h according to the specification, and the values required by the specification were used here.
The method for detecting the structural depth TD of the test pavement comprises the following steps: the test was carried out according to T0961-1995 of Standard on-site test of road pavements (JTG E60-2008). The selected test pavement section should be representative during detection, namely the construction depth TD of the test pavement section should be representative of the average construction depth TD of the test pavement section, so that the control is more accurate. If the selected test pavement section is representative during detection, the control of the test pavement section has deviation, but the control method is superior to the accuracy of the current test method for controlling test data.
When the width b of the water belt left by the water sprayed by the water spraying device on the test road surface is measured, the running speed of the water spraying device needs to be stabilized at a preset speed, and the average value is obtained at three positions. The water hose is wider due to the fact that water overflows due to the fact that the speed is lower when the vehicle body starts, and the width of the water hose is more representative after the vehicle speed is stable.
The method can accurately control the water spraying amount and the water film thickness, and the pavement can be tested after the water film thickness is controlled by the method.
The invention also provides a transverse force coefficient testing method, which is characterized in that the method for controlling the thickness of the road surface water film by the transverse force coefficient test is adopted, the water spraying device is controlled to run at the preset speed, water is sprayed according to the calculated water spraying quantity Q, the water film with the preset thickness is obtained, and then the transverse force coefficient test is carried out. When the vehicle runs at the original speed, the influence of the speed factor on the thickness of the water film can be eliminated.
The above-described test method and the method for controlling the thickness of the road surface water film may be performed by using any water jet device, for example, the following water jet device.
Referring to fig. 1, a water spraying apparatus 100 for testing a transverse force coefficient includes a water supply unit 10, a water spraying unit 20, a pressurizing unit 30 and a flow control unit 40, wherein the water supply unit 10 is used for providing a water source, the water spraying unit 20 is communicated with the water supply unit 10 and draws out water in the water supply unit 10, the water spraying unit 20 includes a water spraying pipe 21 and a water spraying nozzle 22 installed on the water spraying pipe 21, the water spraying pipe 21 is communicated with the water supply unit 10, the pressurizing unit 30 is installed on the water spraying pipe 21 and used for pressurizing water in the water spraying pipe 21 to spray, and the flow control unit 40 is installed on the water spraying pipe 21 and located between the pressurizing unit 30 and the water spraying nozzle 22 and used for adjusting water flow sprayed from the water spraying pipe 21 and further adjusting water spraying amount Q.
In one embodiment, the water supply unit 10 includes a vehicle body 11 and a water tank 12 mounted on the vehicle body 11. The vehicle body 11 can walk on the road surface with the water tank 12, so that the water spraying component 20 can follow the movement to spray water on different positions of the road surface. The shape and structure of the water tank 12 are not limited, and the water can be stored and communicated with the water spraying part 20.
In one embodiment, the water nozzle 22 of the water spraying component 20 is in the shape of a fish tail, and the size of the water outlet of the water nozzle 22 is larger than that of the water inlet. Therefore, the water flow can be sprayed out in a waterfall shape, and the spraying position of the water flow can be adjusted by adjusting the direction of the water spray nozzle. The number of the water jet nozzles 22 is one, two or more, and each is installed to one water jet pipe 21. The number of the water spraying parts 20 may be plural, and plural water spraying parts 20 are controlled by one flow control part 40 or each water spraying part 20 is controlled by one flow control part 40.
In one embodiment, the water flow adjustment range required by the pressurizing member 30 is 1m3/h-60m3And h, so as to adapt to more pavement tests.
In one embodiment, the pressurizing member 30 is a pressurizing water pump.
The water flow control range required by the flow control component 40 is 0L/s-20L/s, so that the water flow is adjusted according to the requirement, and the aim of accurately controlling the water yield in unit time is fulfilled.
In one embodiment, the flow control member 40 is a constant flow valve, and the amount of water flow can be accurately controlled by adjusting the valve. Of course, in other embodiments, the flow control component 40 may be other flow regulating components as long as the purpose of accurately controlling the water output per unit time can be achieved.
Referring to fig. 2, the present invention also provides a system 200 for testing a transverse force coefficient, which includes the water spraying device 100 for testing a transverse force coefficient and the testing assembly 101, wherein the testing assembly 101 is installed at one side of the water supply component 10 and is arranged close to the water spraying component 20, and after the water spraying component 20 sprays water on a test road surface to form a water film, the testing assembly 101 tests the road surface.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A road surface water film thickness control method for a transverse force coefficient test is characterized by comprising the following steps:
detecting the structural depth TD of the tested pavement;
driving a water spraying device on the test pavement for a certain distance according to the water spraying amount of 5 +/-0.5L/s and the preset speed, and measuring the width b of a water band left on the test pavement by the water sprayed by the water spraying device;
calculating the water injection quantity Q required for reaching the preset water film thickness according to the following formula:
wherein v is the running speed of the water spraying device, km/h; delta is the thickness of the water film, mm; d is the maximum nominal grain diameter of the sand used for detecting the structural depth TD of the tested pavement, and is mm; b is the width of the water band m; TD is the depth of construction, mm;
and adopting the water spraying device to run at the preset speed and spray water according to the water spraying quantity Q to obtain a water film with preset thickness.
2. The method for controlling the thickness of the road surface water film for the transverse force coefficient test according to claim 1, wherein the method for detecting the structural depth TD of the test road surface comprises the following steps: the detection is carried out according to T0961-1995 in the specification JTG E60-2008.
3. The method for controlling the thickness of the water film on the road surface for the transverse force coefficient test according to claim 1 or 2, wherein when the width b of the water belt left on the test road surface by the water sprayed by the water spraying device is measured, the driving speed of the water spraying device needs to be stabilized at the preset speed.
4. The method for controlling the thickness of the road surface water film for the transverse force coefficient test according to claim 1 or 2, wherein the water spraying device comprises: a water supply unit;
the water spraying component comprises a water spraying pipe and a water spraying nozzle arranged on the water spraying pipe, and the water spraying pipe is communicated with the water supply component;
a pressing member attached to the water spray pipe;
a flow control member mounted to the spout and positioned between the spout and the pressurizing member.
5. The method for controlling thickness of road surface water film in transverse force coefficient test of claim 4, wherein the water spraying nozzle of the water spraying component is fishtail shaped, and the size of the water outlet of the water spraying nozzle is larger than the size of the water inlet.
6. The method for controlling the thickness of the road surface water film for the transverse force coefficient test according to claim 4, wherein the water flow regulation range of the pressurizing component is 1m3/h-60m3And h, the water flow control range of the flow control component is 0L/s-20L/s.
7. The method for controlling thickness of road surface water film according to claim 4, wherein the water supply part comprises a vehicle body and a water tank mounted on the vehicle body.
8. The road surface water film thickness control method for the transverse force coefficient test according to claim 4, further comprising at least one of the following schemes:
the pressurizing part is a pressurizing water pump;
the flow control component is a constant flow valve;
the number of the water spray nozzles is at least one, and the water spray nozzles are all arranged on one water spray pipe;
the number of the water spraying parts is at least one, and the water spraying parts are all controlled by one flow control part;
the number of the water spraying parts is at least one, and each water spraying part is controlled by a corresponding flow control part.
9. A method for testing the transverse force coefficient is characterized in that the method for controlling the thickness of the road surface water film for testing the transverse force coefficient is adopted, the water spraying device is controlled to run at the preset speed and spray water according to the preset water spraying quantity Q, a water film with the preset thickness is obtained, and then the transverse force coefficient test is carried out.
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| EP0793207A2 (en) * | 1996-03-02 | 1997-09-03 | Daimler-Benz Aktiengesellschaft | Procedure for determining the road gripping of motor vehicle wheels |
| CN203243777U (en) * | 2013-05-06 | 2013-10-23 | 长安大学 | Rail-mounted soil watering cart for laboratory |
| CN203259890U (en) * | 2013-04-17 | 2013-10-30 | 南京熙赢测控技术有限公司 | Automatic sprinkling device for road friction coefficient tester |
| CN205941314U (en) * | 2016-08-27 | 2017-02-08 | 北京今谷神箭测控技术研究所 | Vehicular road surface transverse force friction coefficient test car |
| CN107132060A (en) * | 2017-06-27 | 2017-09-05 | 山东建筑大学 | Tyre tread drainage experimental bench and experimental method |
| CN206954082U (en) * | 2017-07-18 | 2018-02-02 | 中国重型汽车集团唐山市宏远专用汽车有限公司 | A kind of road detection vehicle Sideway force coefficient test Two dimensional control water system |
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2019
- 2019-04-24 CN CN201910333672.7A patent/CN110031395B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0793207A2 (en) * | 1996-03-02 | 1997-09-03 | Daimler-Benz Aktiengesellschaft | Procedure for determining the road gripping of motor vehicle wheels |
| CN203259890U (en) * | 2013-04-17 | 2013-10-30 | 南京熙赢测控技术有限公司 | Automatic sprinkling device for road friction coefficient tester |
| CN203243777U (en) * | 2013-05-06 | 2013-10-23 | 长安大学 | Rail-mounted soil watering cart for laboratory |
| CN205941314U (en) * | 2016-08-27 | 2017-02-08 | 北京今谷神箭测控技术研究所 | Vehicular road surface transverse force friction coefficient test car |
| CN107132060A (en) * | 2017-06-27 | 2017-09-05 | 山东建筑大学 | Tyre tread drainage experimental bench and experimental method |
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