CN106290145B - A kind of the bituminous pavement friction coefficient tester and its test method of simulated rainfall - Google Patents
A kind of the bituminous pavement friction coefficient tester and its test method of simulated rainfall Download PDFInfo
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- CN106290145B CN106290145B CN201610619164.1A CN201610619164A CN106290145B CN 106290145 B CN106290145 B CN 106290145B CN 201610619164 A CN201610619164 A CN 201610619164A CN 106290145 B CN106290145 B CN 106290145B
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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
Abstract
The present invention relates to the bituminous pavement friction coefficient testers and test method of a kind of simulated rainfall.It includes the rain case for being divided into capital equipment area and ancillary equipment area；Capital equipment area is divided into upper and bottom section by remittance rain bottom plate, and lower part is divided into collection box；The right half of upper part is equipped with the water distributor with spray head at top；The right half of upper part is set in bottom there are two strip, and die trial is placed in two strips centre；The upper surface of die trial is equipped with portable pendulum tester；Left half is equipped with water butt in bottom, which is connected to the water pump in collection box by water inlet pipe；Water butt is equipped with water pump at top, which is connected to water distributor by aqueduct；Aqueduct is up also disposed with threeway, flowmeter and solenoid valve；The return pipe for being connected to water butt of threeway connecting band regulating valve；Ancillary equipment area is equipped with control cabinet.The present invention has the characteristics that structure is simple, easy to operate.
Description
Technical field
The invention belongs to bituminous pavement property the field of test technology, it particularly relates to arrive a kind of pitch of simulated rainfall
Friction coefficient tester for pavement and its test method.
Background technique
With the development of economy, road quality classification is continuously improved, and the volume of traffic increases, and speed is accelerated, and the antiskid of bituminous pavement is asked
Topic becomes increasingly conspicuous, and especially in the rainy day, Bitumen Pavement Anti-Skid Performance is substantially reduced, and easily makes vehicle slip out of control, cause casualties,
The major accidents such as property loss.In order to verify whether Bitumen Pavement Anti-Skid Performance can satisfy requirement, we use pendulum-type
Instrument measures surface friction coefficient.But during the test, it is merely able to test the bituminous pavement coefficient of friction under the conditions of the non-rainy day,
It can not reflect the bituminous pavement coefficient of friction of different rainfall intensities under the conditions of the rainy day, overland flow coefficient.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of structures, simple, easy to operate and using effect is good
The bituminous pavement friction coefficient tester and its test method of simulated rainfall.
A kind of bituminous pavement friction coefficient tester of simulated rainfall of the present invention, the tester include being divided into master
The rain case 1 in battery limits and ancillary equipment area is wanted, capital equipment area is located at the left of rain case 1；Capital equipment area is by remittance rain bottom plate 15
It is divided into upper and bottom section, lower part is divided into collection box 17, and upper part is divided into left half and right half again；Right half is at top
Equipped with the water distributor 2 with spray head 3；Right half is set in bottom there are two strip 13, and die trial 19 is placed among two strips 13；
The upper surface of die trial 19 is equipped with portable pendulum tester 12；Left half is equipped with water butt 10 in bottom, which passes through water inlet pipe
14 are connected to the water pump A16 in collection box 17；Water butt 10 is equipped with water pump B11 at top, and water pump B11 passes through aqueduct
It is connected to water distributor 2；Aqueduct is up also disposed with threeway 9, flowmeter 4 and solenoid valve 5；Only surplus one of threeway 9
The return pipe 8 of a outlet connecting band regulating valve 7, the return pipe 8 are connected to water butt 10；Ancillary equipment area is equipped with control cabinet 24.
A kind of bituminous pavement friction coefficient tester of simulated rainfall of the present invention is set on the right side of the remittance rain bottom plate 15
Strip 13 and several " one " word vacancy sections there are two setting；The strip 13 is in cuboid.
A kind of bituminous pavement friction coefficient tester of simulated rainfall of the present invention, the die trial 19 include being trapped among bottom
Left side side form 28, right side side form 29, front side form 26, rear side form 27 and the left side baffle 20 of 30 4 side of plate and right side gear
Plate 21；The length direction of the left side side form 28 and right side side form 29 is parallel with load wheel direction of travel；The front side form 26
It is vertical with load wheel direction of travel with the length direction of rear side form 27；It is provided at the top surface edge of the left side side form 28
Left groove 22；Right groove 23 is provided at the top surface edge of the right side side form 29；The left side baffle 20 can be held
It is inserted in left groove 22；The right-hand apron 21 can be with socket joint in right groove 23, for adjusting PVvalue testing examination
The runoff coefficient on part surface；The lower surface of the bottom plate 30 is the plane of rectangle；The corresponding molding examination in the upper surface of the bottom plate 30
The region of part is the arc surface along front side form 26 to rear side form 27.
A kind of bituminous pavement friction coefficient tester of simulated rainfall of the present invention, the die trial 19 is in bottom plate 30
Locate corresponding space be irregular body, the top of the irregular body is the cuboid of long 50cm, width 50cm, high 5cm, it is described not
The plan view from above of the lower part of rule body is the square of long 50cm, width 50cm, the cross-sectional view of the lower part of the irregular body
For the arc surface of chord length 50cm, the bitumen mixture specimen of above-mentioned irregular body can be made.
A kind of bituminous pavement friction coefficient tester of simulated rainfall of the present invention, the control cabinet 24 is on panel
It is provided with display screen 33 and input keyboard 34, in the controller 25 for being internally provided with electronic circuit board connection.
A kind of bituminous pavement friction coefficient tester of simulated rainfall of the present invention, the solenoid valve 5, regulating valve 7,
Water pump B11 and water pump A16 connect with controller 25.
When carrying out the bituminous pavement PVvalue testing of simulated rainfall, the water in water butt 10 passes through the work of water pump B11
It is flowed into water distributor 2 with along outlet pipe 6, and raindrop is formed by the simulation of spray head 3 and are dropped in bitumen mixture specimen surface, rain
Water slides from surface of test piece to remittance 15 surface of rain bottom plate, and flows into collection box 17 along remittance rain bottom plate 15, the water in collection box 17
Water butt 10 is flowed by water pump A16 and water inlet pipe 14, feeds the water in water butt 10；Threeway 9 and regulating valve 7,4 and of flowmeter
The adjustable rainfall intensity of the synergistic effect of solenoid valve 5；By whether baffle 20 and right-hand apron on the left of the setting of die trial two sides
21 adjustable runoff coefficients.Under condition of raining, portable pendulum tester 12 is placed in the examination of the asphalt in die trial 19 and die trial 19
Part surface can carry out the bituminous pavement PVvalue testing of simulated rainfall.
A kind of test method of the bituminous pavement friction coefficient tester of simulated rainfall of the present invention, the test side
Method specific steps are as follows:
1) in 19 two sides of die trial of forming test specimen, the left side baffle 20 for being suitble to height is selected according to runoff coefficient
With right-hand apron 21, left side baffle 20 is inserted into the left groove 22 of die trial 19, right-hand apron 21 is inserted into the right side of die trial 19
In side groove 23；
2) water of 2/3 volume is added in water butt 10, the water of 2/3 volume is added in collection box 17, opens flowmeter
4, regulating valve 7, solenoid valve 5, water pump A16, water pump B11 adjust rainfall intensity, are then shut off rainer；
3) test specimen is fixed on to the centre of two strips 13 together with die trial 19, portable pendulum tester is placed on to the measuring point of surface of test piece
On, and make the swaying direction of pendulum with when specimen molding to roll direction consistent；
4) leveling bolt on portable pendulum tester pedestal is rotated, keeps air level placed in the middle, carries out instrument leveling；
5) loosen pinch grip, rotation lifting handle makes hoisting Gao Bingneng freely swing, then screws pinch grip, will
Pendulum is fixed on the cantilever of right side, makes pendulum in horizontal release position, and pointer is allocated to right end is parallel with swing rod to be located, and presses release
Switch makes to be flapped toward left drive balancing point swing, when falling after pendulum reaches extreme higher position, be caught swing rod with hand, pointer is answered at this time
Nulling slightly can screw or unscrew the adjusting nut of pendulum if not nulling；It operates repeatedly, until pointer nulling, zeroing allowable error are
± 1, zeroing finishes；
6) it allows pendulum in the state that naturally droops, unclamps fixed handle, rotation lifting handle makes to accommodate drop；At the same time, it mentions
Playing lifting handle makes to be flapped toward left side movement, and then putting down lifting handle makes sheet rubber lower edge gently contact to earth, and puts sliding against sheet rubber
Length gage makes gage left end be directed at sheet rubber lower edge；Lifting lifting handle again makes to be flapped toward right side movement, and then putting down lifting handle makes
Sheet rubber lower edge gently contacts to earth, and checks that sheet rubber lower edge should be flushed with the right end of sliding length gage；If flushing, illustrate rubber
The distance (sliding length) that piece contacts to earth twice meets the regulation of 126mm；It, should be with sheet rubber long side just when checking sliding length
It contacts subject to road surface, the strength forward slip of pendulum can not be borrowed, do not conformed to the actual conditions with the sliding length of non-calibrating；If not flushing, rise
Height that is high or reducing pendulum or instrument base；With the height of the leveling serew adjustment instrument base on rotary apparatus pedestal when fine tuning
Method it is more convenient, but should be noted keep air level it is placed in the middle；Repetitive operation, until sliding length meets the regulation of 126mm；
7) pendulum is fixed on the cantilever of right side, makes pendulum in horizontal release position, and pointer is allocated to right end and is put down with swing rod
At row；
8) flowmeter 4, regulating valve 7, solenoid valve 5, water pump A16, water pump B11 are opened, rainfall intensity is adjusted, to one section of rainfall
After time, after the runoff coefficient of surface of test piece reaches preset value, the release switch on the cantilever of right side is pressed, keeps pendulum sliding on road surface
It crosses；It when swing rod is fallen after rise, is caught with hand, reads but do not record.Then swing rod and pointer is made to be replaced in horizontal release position.
9) operation 5 times of step 7) and step 8) are repeated, and read to remember the pendulum value measured every time；In 5 values of single point assay
The difference of maxima and minima is not greater than 3；When being greater than 3 such as difference, Producing reason should be checked, and repeat again aforementioned each
Item operation, until meeting regulation；Take pavement skid resistance value (i.e. pendulum value BPN of the average value of 5 measurements as single-point1), it is rounded
Number；
10) the road table temperature in the case where point position temperature measures note condition of raining, accurately to 1 DEG C；
11) each measuring point is made of 3 single-points, that is, needs to be measured in parallel 3 times at same observation station by the above process, with 3 times
Typical value (be accurate to 1) of the average value of measurement result as the measuring point；3 single-points should all be located at same surface of test piece, single-point
Between distance be 20cm-30cm；The position of measuring point is indicated with the position of intermediate single-point；
Compared with prior art, the bituminous pavement friction coefficient tester and test method of simulated rainfall of the present invention
It has the advantage that
1) the bituminous pavement portable pendulum tester simple structure and reasonable design of simulated rainfall used by and installation and operation letter is used
Just, input cost is lower, install compact, and occupied space is smaller；
2) the bituminous pavement portable pendulum tester parameter of simulated rainfall used by adjust it is easy, can to rainfall intensity, runoff coefficient,
The parameters such as rainfall duration are adjusted, and are provided with control cabinet, and control is simple, can accurately control raininess degree, runoff coefficient, drop
Rain lasts, so that the bituminous pavement PVvalue testing process under condition of raining is easily controllable；
3) left groove and right groove of the two sides setting parallel with direction of travel of die trial used by, can be according to need
Fixed left side baffle and right-hand apron are determined the need for, and then can be used for controlling the runoff on bitumen mixture specimen surface
Coefficient, for simulating the runoff coefficient situation of practical road surface；
4) using effect is good and practical value is high, and good appearance largely facilitates the bituminous pavement of simulated rainfall
Dynamic rotary type PVvalue testing, and it is easily controllable to test process, has many advantages, such as that test operation is convenient, it is accurate to control,
The accuracy of the PVvalue testing result of simulated rainfall can be effectively ensured.
Detailed description of the invention
Fig. 1: tester schematic diagram of the present invention；Fig. 2: remittance rain floor diagram；Fig. 3: die trial structure chart；Fig. 4: left side
Baffle figure；Fig. 5: right-hand apron figure.1- rain case, 2- water distributor, 3- spray head, 4- flowmeter, 5- solenoid valve, 6- outlet pipe, 7- tune
Save valve, 8- return pipe, 9- threeway, 10- water butt, 11- water pump B, 12- portable pendulum tester, 13- strip, 14- water inlet pipe, 15- remittance rain
Bottom plate, 16- water pump A, 17- collection box, 19- die trial, the left side 20- baffle, 21- right-hand apron, 22- left groove, the right side 23-
Groove, 24- control cabinet, 25- controller, the front 26- side form, the rear 27- side form, the left side 28- side form, the right side 29- side form, 30-
Bottom plate, display screen -33, input keyboard -34.
Specific embodiment
Below with reference to specific embodiment to the bituminous pavement friction coefficient tester of simulated rainfall of the present invention and
Test method is described further, but the scope of protection of the present invention is not limited thereto.
Embodiment 1
A kind of bituminous pavement friction coefficient tester of simulated rainfall, the tester include being divided into capital equipment area and auxiliary
The rain case 1 of battery limits is helped, capital equipment area is located at the left of rain case 1；Capital equipment area is divided into upper part by remittance rain bottom plate 15
With lower part, lower part is divided into collection box 17, and upper part is divided into left half and right half again；Right half is equipped with band spray head 3 at top
Water distributor 2；Right half is set in bottom there are two strip 13, and die trial 19 is placed among two strips 13；The upper table of die trial 19
Face is equipped with portable pendulum tester 12；Left half is equipped with water butt 10 in bottom, which is connected to charge for remittance by water inlet pipe 14
Water pump A16 in case 17；Water butt 10 is equipped with water pump B11 at top, and water pump B11 is connected to water distributor by aqueduct
2；Aqueduct is up also disposed with threeway 9, flowmeter 4 and solenoid valve 5；The only surplus one outlet connecting band of threeway 9
The return pipe 8 of regulating valve 7, the return pipe 8 are connected to water butt 10；Ancillary equipment area is equipped with control cabinet 24.
There are two strip 13 and several " one " word vacancy sections for setting on the right side of the remittance rain bottom plate 15；The strip 13 is in rectangular
Body.The die trial 19 includes left side side form 28, right side side form 29, front side form 26, the rear side form 27 for being trapped among 30 4 side of bottom plate,
And left side baffle 20 and right-hand apron 21；The length direction of the left side side form 28 and right side side form 29 and load wheel walking side
To parallel；The length direction of the front side form 26 and rear side form 27 is vertical with load wheel direction of travel；The left side side form
Left groove 22 is provided at 28 top surface edge；Right groove is provided at the top surface edge of the right side side form 29
23；The left side baffle 20 can be with socket joint in left groove 22；The right-hand apron 21 can be with socket joint in right groove 23
It is interior, for adjusting the runoff coefficient of PVvalue testing surface of test piece；The lower surface of the bottom plate 30 is the plane of rectangle；It is described
The region that the upper surface of bottom plate 30 corresponds to shaping test piece is arc surface along front side form 26 to rear side form 27.The die trial
19 at bottom plate 30 corresponding space be irregular body, the top of the irregular body is the length of long 50cm, width 50cm, high 5cm
Cube, the plan view from above of the lower part of the irregular body are the square of long 50cm, width 50cm, the lower part of the irregular body
Cross-sectional view be chord length 50cm arc surface, the bitumen mixture specimen of above-mentioned irregular body can be made.The control
Case 24 is provided with display screen 33 and input keyboard 34 on panel, in the controller 25 for being internally provided with electronic circuit board connection.
The solenoid valve 5, regulating valve 7, water pump B11 and water pump A16 connect with controller 25.Temperature is equipped in the ancillary equipment area
Spend sensor and heating device；The connecting shaft is equipped with displacement sensor.
When carrying out the bituminous pavement PVvalue testing of simulated rainfall, the water in water butt 10 passes through the work of water pump B11
It is flowed into water distributor 2 with along outlet pipe 6, and raindrop is formed by the simulation of spray head 3 and are dropped in bitumen mixture specimen surface, rain
Water slides from surface of test piece to remittance 15 surface of rain bottom plate, and flows into collection box 17 along remittance rain bottom plate 15, the water in collection box 17
Water butt 10 is flowed by water pump A16 and water inlet pipe 14, feeds the water in water butt 10；Threeway 9 and regulating valve 7,4 and of flowmeter
The adjustable rainfall intensity of the synergistic effect of solenoid valve 5；By whether baffle 20 and right-hand apron on the left of the setting of die trial two sides
21 adjustable runoff coefficients.Under condition of raining, portable pendulum tester 12 is placed in the examination of the asphalt in die trial 19 and die trial 19
Part surface can carry out the bituminous pavement PVvalue testing of simulated rainfall.
A kind of test method of the bituminous pavement friction coefficient tester of simulated rainfall of the present invention, the test side
Method specific steps are as follows:
1) in 19 two sides of die trial of forming test specimen, the left side baffle 20 for being suitble to height is selected according to runoff coefficient
With right-hand apron 21, left side baffle 20 is inserted into the left groove 22 of die trial 19, right-hand apron 21 is inserted into the right side of die trial 19
In side groove 23；
2) water of 2/3 volume is added in water butt 10, the water of 2/3 volume is added in collection box 17, opens flowmeter
4, regulating valve 7, solenoid valve 5, water pump A16, water pump B11 adjust rainfall intensity, are then shut off rainer；
3) test specimen is fixed on to the centre of two strips 13 together with die trial 19, portable pendulum tester is placed on to the measuring point of surface of test piece
On, and make the swaying direction of pendulum with when specimen molding to roll direction consistent；
4) leveling bolt on portable pendulum tester pedestal is rotated, keeps air level placed in the middle, carries out instrument leveling；
5) loosen pinch grip, rotation lifting handle makes hoisting Gao Bingneng freely swing, then screws pinch grip, will
Pendulum is fixed on the cantilever of right side, makes pendulum in horizontal release position, and pointer is allocated to right end is parallel with swing rod to be located, and presses release
Switch makes to be flapped toward left drive balancing point swing, when falling after pendulum reaches extreme higher position, be caught swing rod with hand, pointer is answered at this time
Nulling slightly can screw or unscrew the adjusting nut of pendulum if not nulling；It operates repeatedly, until pointer nulling, zeroing allowable error are
± 1, zeroing finishes；
6) it allows pendulum in the state that naturally droops, unclamps fixed handle, rotation lifting handle makes to accommodate drop；At the same time, it mentions
Playing lifting handle makes to be flapped toward left side movement, and then putting down lifting handle makes sheet rubber lower edge gently contact to earth, and puts sliding against sheet rubber
Length gage makes gage left end be directed at sheet rubber lower edge；Lifting lifting handle again makes to be flapped toward right side movement, and then putting down lifting handle makes
Sheet rubber lower edge gently contacts to earth, and checks that sheet rubber lower edge should be flushed with the right end of sliding length gage；If flushing, illustrate rubber
The distance (sliding length) that piece contacts to earth twice meets the regulation of 126mm；It, should be with sheet rubber long side just when checking sliding length
It contacts subject to road surface, the strength forward slip of pendulum can not be borrowed, do not conformed to the actual conditions with the sliding length of non-calibrating；If not flushing, rise
Height that is high or reducing pendulum or instrument base；With the height of the leveling serew adjustment instrument base on rotary apparatus pedestal when fine tuning
Method it is more convenient, but should be noted keep air level it is placed in the middle；Repetitive operation, until sliding length meets the regulation of 126mm；
7) pendulum is fixed on the cantilever of right side, makes pendulum in horizontal release position, and pointer is allocated to right end and is put down with swing rod
At row；
8) flowmeter 4, regulating valve 7, solenoid valve 5, water pump A16, water pump B11 are opened, rainfall intensity is adjusted, to one section of rainfall
After time, after the runoff coefficient of surface of test piece reaches preset value, the release switch on the cantilever of right side is pressed, keeps pendulum sliding on road surface
It crosses；It when swing rod is fallen after rise, is caught with hand, reads but do not record, swing rod and pointer is then made to be replaced in horizontal release position；
9) operation 5 times of step 7) and step 8) are repeated, and read to remember the pendulum value measured every time；In 5 values of single point assay
The difference of maxima and minima is not greater than 3；When being greater than 3 such as difference, Producing reason should be checked, and repeat again aforementioned each
Item operation, until meeting regulation；Take pavement skid resistance value (i.e. pendulum value BPN of the average value of 5 measurements as single-point1), it is rounded
Number；
10) the road table temperature in the case where point position temperature measures note condition of raining, accurately to 1 DEG C；
11) each measuring point is made of 3 single-points, that is, needs to be measured in parallel 3 times at same observation station by the above process, with 3 times
Typical value (be accurate to 1 unit) of the average value of measurement result as the measuring point；3 single-points should all be located at same test specimen table
Face, distance is 20cm-30cm between single-point；The position of measuring point is indicated with the position of intermediate single-point.
Claims (5)
1. a kind of bituminous pavement friction coefficient tester of simulated rainfall, which is characterized in that the tester includes being divided into mainly
The rain case (1) of battery limits and ancillary equipment area, capital equipment area is located at the left of rain case (1)；Capital equipment area is by remittance rain bottom plate
(15) it is divided into upper and bottom section, lower part is divided into collection box (17), and upper part is divided into left half and right half again；Right half
The water distributor (2) with spray head (3) is equipped at top；Right half is set in bottom there are two strip (13), in two strips (13)
Between place die trial (19)；The upper surface of die trial (19) is equipped with portable pendulum tester (12)；Left half is equipped with water butt (10) in bottom, the storage
Bucket (10) bottom is connected to the water pump A (16) in collection box (17) by water inlet pipe (14)；Water butt (10) is equipped at top
Water pump B (11), water pump B (11) are connected to water distributor (2) by aqueduct；Aqueduct is up also disposed with threeway
(9), flowmeter (4) and solenoid valve (5)；The return pipe (8) of the only surplus one outlet connecting band regulating valve (7) of threeway (9), should
Return pipe (8) is connected to water butt (10)；Ancillary equipment area is equipped with control cabinet (24)；
There are two strip (13) and several " one " word vacancy sections for remittance rain bottom plate (15) the right half setting；The strip (13) is in
Cuboid；
The die trial (19) include be trapped among the left side side form (28) of (30) four side of bottom plate, right side side form (29), front side form (26),
Rear side form (27) and left side baffle (20) and right-hand apron (21)；The left side side form (28) and right side side form (29)
Length direction is parallel with load wheel direction of travel；The length direction of the front side form (26) and rear side form (27) and load wheel
Direction of travel is vertical；Left groove (22) are provided at the top surface edge of the left side side form (28)；The right side side form
(29) right groove (23) are provided at top surface edge；The left side baffle (20) can socket joint in left groove (22)
It is interior；The right-hand apron (21) can socket joint in the right groove (23), for adjusting the diameter of PVvalue testing surface of test piece
Flow coefficient；The lower surface of the bottom plate (30) is the plane of rectangle；The upper surface of the bottom plate (30) corresponds to the area of shaping test piece
Domain is the arc surface along front side form (26) to rear side form (27).
2. the bituminous pavement friction coefficient tester of simulated rainfall according to claim 1, which is characterized in that the die trial
(19) corresponding space is irregular body at bottom plate (30), and the top of the irregular body is long 50cm, width 50cm, high 5cm
Cuboid, the plan view from above of the lower part of the irregular body is the square of long 50cm, width 50cm, the irregular body
The cross-sectional view of lower part is the arc surface of chord length 50cm, and the bitumen mixture specimen of above-mentioned irregular body can be made.
3. the bituminous pavement friction coefficient tester of simulated rainfall according to claim 1, which is characterized in that the control
Case (24) is provided with display screen (33) and input keyboard (34) on panel, in the control for being internally provided with electronic circuit board connection
Device (25).
4. the bituminous pavement friction coefficient tester of simulated rainfall according to claim 1, which is characterized in that the electromagnetism
Valve (5), regulating valve (7), water pump B (11) and water pump A (16) connect with controller (25).
5. the test method of the bituminous pavement friction coefficient tester of simulated rainfall according to claim 4, feature exist
In the test method specific steps are as follows:
1) in die trial (19) two sides of forming test specimen, according to runoff coefficient select the left side baffle (20) for being suitble to height and
Right-hand apron (21) are inserted into the left groove (22) of left side baffle (20) insertion die trial (19) and are tried by right-hand apron (21)
In the right groove (23) of mould (19)；
2) water of 2/3 volume is added in water butt (10), the water of 2/3 volume is also added in collection box (17), opens flow
(4), regulating valve (7), solenoid valve (5), water pump A (16), water pump B (11) are counted, rainfall intensity is adjusted, is then shut off rainer；
3) test specimen is fixed on to the centre of two strips (13) together with die trial (19), portable pendulum tester (12) is placed on surface of test piece
On measuring point, and make the swaying direction of pendulum with when specimen molding to roll direction consistent；
4) leveling bolt on portable pendulum tester pedestal is rotated, keeps air level placed in the middle, portable pendulum tester (12) are leveled；
5) loosen pinch grip, rotation lifting handle makes hoisting Gao Bingneng freely swing, then screws pinch grip, and pendulum is solid
It is scheduled on the cantilever of right side, makes pendulum in horizontal release position, and pointer is allocated to right end is parallel with swing rod to be located, press and discharge
It closes, makes to be flapped toward left drive balancing point swing, when falling after pendulum reaches extreme higher position, be caught swing rod with hand, pointer should refer at this time
Zero, if not nulling, slightly screw or unscrew the adjusting nut of pendulum；It operates repeatedly, until pointer nulling, zeroing allowable error is ± 1,
Portable pendulum tester (12) zeroing finishes；
6) it allows pendulum in the state that naturally droops, unclamps fixed handle, rotation lifting handle makes to accommodate drop；At the same time, lift act
Rising handle makes to be flapped toward left side movement, and then putting down lifting handle makes sheet rubber lower edge gently contact to earth, and puts sliding length against sheet rubber
Gage makes gage left end be directed at sheet rubber lower edge；Lifting lifting handle again makes to be flapped toward right side movement, and then putting down lifting handle makes rubber
Piece lower edge gently contacts to earth, and checks that sheet rubber lower edge should be flushed with the right end of sliding length gage；If flushing, illustrate sheet rubber two
The secondary distance contacted to earth meets the regulation of 126mm；When checking sliding length, the sheet rubber long side that should be subject to just contacts road surface, no
The strength forward slip that pendulum can be borrowed, is not conformed to the actual conditions with the sliding length of non-calibrating；If not flushing, pendulum or pendulum-type is raised and lowered
The height of instrument zeroing pedestal；Compared when fine tuning with the method for the height of the leveling bolt adjustment instrument base on rotary apparatus pedestal
It is convenient, but should be noted and keep air level placed in the middle；Repetitive operation, until sliding length meets the regulation of 126mm；
7) pendulum is fixed on the cantilever of right side, makes pendulum in horizontal release position, and pointer is allocated to right end is parallel with swing rod to be located；
8) flowmeter (4), regulating valve (7), solenoid valve (5), water pump A (16), water pump B (11) are opened, rainfall intensity are adjusted, wait drop
Rain for a period of time after, after the runoff coefficient of surface of test piece reaches preset value, press right side cantilever on release switch, the road Shi Bai
Face slips over；It when swing rod is fallen after rise, is caught with hand, reads but do not record, swing rod and pointer is then made to be replaced in horizontal release position
It sets；
9) operation 5 times of step 7) and step 8) are repeated, and read to remember the pendulum value measured every time；It is maximum in 5 values of single point assay
The difference of value and minimum value is not greater than 3；When being greater than 3 such as difference, Producing reason should be checked, and repeat aforementioned every behaviour again
Make, until meeting regulation；Take pavement skid resistance value of the average value of 5 measurements as single-point, round numbers；
10) the road table temperature in the case where point position temperature measures note condition of raining, accurately to 1 DEG C；
11) each measuring point is made of 3 single-points, that is, needs to be measured in parallel 3 times at same observation station by the above process, is measured with 3 times
As a result typical value of the average value as the measuring point, precision are 1 unit；3 single-points should all be located at same surface of test piece, single-point
Between distance be 20cm-30cm；The position of measuring point is indicated with the position of intermediate single-point.
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| CN101408499A (en) * | 2008-11-11 | 2009-04-15 | 长安大学 | Device for testing anti-skid performance of road surface |
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