CN105445180A - Pavement antiskid performance testing device and testing method thereof - Google Patents
Pavement antiskid performance testing device and testing method thereof Download PDFInfo
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Abstract
The invention provides a pavement antiskid performance testing device. The device comprises a testing stand in an environment control box, a horizontal connection rod, a vertically arranged pole, and a support, which is vertically fixed on the testing stand; the top end of the support is provided with a torque measuring device, the torque measuring device is fixedly connected to one end of the horizontal connection rod through a rotation shaft, the other end of the horizontal connection rod is connected to the top end of the pole through an angle adjusting mechanism, the bottom end of the pole is provided with a driving motor and a braking device; a testing wheel is arranged on the output shaft of the driving motor, at the same time, a speed and distance measuring device is arranged on the support; a weighting and pressurizing device is arranged on the pole, in testing, a test piece is fixed on the testing stand, and the testing wheel is driven by the driving motor to move in circles around the pole, which is taken as the center. Compared with the static measuring method in the conventional standards, the testing results of the provided measuring method is more direct, the application value is greater, the experimental conditions are more close to the real driving situation of vehicles, and the real antiskid performance of pavement can be better represented.
Description
Technical field
The present invention relates to proving installation and the method for testing thereof of a kind of Pavement Performance proving installation and method of testing, particularly a kind of pavement skid resistance condition, belong to pavement skid resistance condition determination techniques field.
Background technology
Pavement skid resistance condition be Pavement Design and construction time an important indicator, be the main design parameters determining that vehicle normal safe travels.The evaluation index provided in existing Pavement Design specification and delivery receiving acceptance standard and method have two kinds, and one adopts friction factor, and one adopts construction depth.
Friction factor adopts swinging friction coefficient instrument to measure, and it is smooth piece of the standard of employing after level altitude release, through with the pavement friction of water spray after, the maximum angle of pendulum and road surface vertical direction is the friction co-efficient value that this goes out road surface.Swinging friction coefficient instrument basic test method is as follows:
(1) instrument leveling: the leveling bolt on rotating base, makes air level placed in the middle.
(2) return to zero: press release-push, make to be flapped toward the left drive beat of pointer.When pendulum reach fall behind extreme higher position time, caught by fork with hand, now pointer answers nulling.
(3) check sliding length: the 1. clean road surface of broom, the loose pellet in hunting range on road surface removed by blend rubber scraper plate.2. allow pendulum free suspension, mention the lifting handle on yaw, cushion block on base is placed in below set screw, make smooth piece of rising on yaw, loosen pinch grip, rotate on column and be elevated handle, pendulum is slowly declined.When the sheet rubber on slide block has just contacted road surface, screw by pinch grip, yaw is fixed.3. mention lifting handle, take off cushion block, pendulum is moved right.Then, portable lifting handle makes pendulum slowly to left movement, until the edge of sheet rubber just contacts road surface.Gauge is set at the outside swaying direction of sheet rubber, this point of one end positive alignment of chi.Again with portable lifting handle, make smooth piece upwards to lift, and make pendulum continue to move to the left side, sheet rubber is returned and falls kiss the earth again, sheet rubber twice distance with road surface contact point should at 126mm(and sliding length) left and right.If when sliding length does not meet standard, then to raise or at the bottom of lowering apparatus, the leveling serew in front corrects, but need leveling air level, repeat this and check until sliding length meets the regulation of 126mm.
(4) water with the water of watering can and spill examination survey road surface, blend rubber scraper plate scraper surface mud.
(5) again sprinkle water, and press release-push, pendulum is slipped on road surface, pointer can indicate the pendulum value on road surface.But first time measures, and does not keep a record.When fork falls after rise, catch pendulum with left hand, the right hand mentions act long handle makes smooth piece of rising, is moved right by pendulum, and makes fork and pointer again be placed in horizontal release position.
(6) repeat the time-and-motion study 5 times of (5), and read to remember each pendulum value measured, i.e. BPN, in 5 numerical value, the difference of maxima and minima must not be greater than 3, as difference be greater than 3 time, should Producing reason be checked, and again repeat above-mentioned operations, to conforming with the regulations.Get the antiskid value of mean value as each measuring point road surface of 5 mensuration, i.e. pendulum value BPN, round numbers, represents with BPN.
(7), in the temperature of point position Shang Yong road table temperature measurement note wet road surface, be accurate to 1 DEG C.
(8) by above method, same place replicate determination is no less than 3 times, and 3 measuring points are all positioned on wheel path, and measuring point is asked apart from 3 ~ 5m.This place locates with the positional representation of middle measuring point.The mean value of 3 measurement results is all got as test findings in everywhere, is accurate to 1BPN.
The construction depth of construction depth and road surface is the important indicator of surface roughness, and be the depth degree in gap between the table building stones of road, degree of roughness is larger, and corresponding pavement skid resistance condition is also higher.Construction depth generally adopts sand patch method to measure, and can be further divided into hand lay-up or electronic sand patch method, and occurred the method for measuring of employing laser texture meter in recent years, work efficiency is higher.Wherein the method for manual sand patch method is as follows:
With broom or hairbrush the road cleaning near measuring point is clean, area is not less than 30cm × 30cm.
(2) use scuppit sand loading, fill sand along barrel in cylinder, above portable cylinder, on hard road surfaces, percussion 3 times lightly, makes sand closely knit, supplies sand face steel ruler and once strike off.
Note: not directly consumption sand wound packages sand, in order to avoid the homogeneity of influence amount sand density.
(3) sand is poured on road surface, what be stained with sheet rubber with bottom surface is bulldozed plate, repeat from inside to outside to pave motion do rotation, slightly firmly sand is carefully outwards spread out as much as possible, sand is made to insert in the space of rough road surfaces, as far as possible sand is spread out circular, and the remaining sand that floats must not be left from the teeth outwards.Note, can not exert oneself excessive when paving or outwards push.
(4) measure institute by Steel Ruler and form the diameter of two vertical direction justified, get its mean value, accurately to 5mm.
(5), by above method, same place replicate determination is no less than 3 times, and 3 measuring points are all positioned on wheel path, measuring point spacing 3 ~ 5m.To same place, should be measured by same laboratory technician.This place locates with the positional representation of middle measuring point.
(6) by following formulae discovery result
In formula: TD-road surface construction degree of depth (mm);
Volume (the 25cm of V-sand
3);
The mean diameter (mm) of D-shakeout sand.
(7) the mean value of the measurement result of 3 pavement structural depths is all got as test findings in everywhere, accurately to 0.01mm.
The method specified in above two kinds of specifications can be found out, is no matter to adopt friction factor or construction depth is all to evaluate the cling property on road surface with indirect indexes.In addition, actual wheel is all the state of motion when braking, and the friction force of tire is also rolling friction is main, therefore can not well simulate the situation of braking in actual vehicle driving process.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of proving installation and method of testing thereof of pavement skid resistance condition, can intend being used for the designing material on road surface or the cling property on actual road surface in sensing chamber; Also can be used for evaluating through test of long duration, simulate the attenuation of ground surface material cling property under different service condition, and estimate the life-span of pavement skid resistance condition.
In order to solve above technical matters, the proving installation of a kind of pavement skid resistance condition provided by the invention, comprise the testing table be arranged in environment control case, transverse link, the pole of vertical setting and the support be vertically fixed on described testing table, the top of described support is provided with torque sensing system, described torque sensing system is fixedly connected with one end of transverse link by rotating shaft, the other end of described transverse link connects pole top by angle adjusting mechanism, drive motor and brake gear are installed in the bottom of described pole, installation test wheel on the output shaft of described drive motor, simultaneously, described support is provided with speed and Distnace determination device, described pole is provided with counterweight and pressue device, when testing, test specimen is fixed on described testing table, and described experimental wheel can circle under the driving of drive motor centered by support on test specimen.
Further restriction technical scheme of the present invention, the proving installation of aforesaid pavement skid resistance condition, described transverse link adopts adjustable length structure, to meet the requirement of different tests condition.
The proving installation of aforesaid pavement skid resistance condition, described testing table surrounding is provided with the bolt for fixing test specimen, in order to be fixed on testing table by test specimen, to avoid test specimen to offset when testing, affecting test result.
The proving installation of aforesaid pavement skid resistance condition, temperature and humidity control device is provided with in described environment control case, in environment control case can simulated roadway dry, moist, rain, to snow and low temperature to freeze etc. under particular surroundings, the situation of pavement skid resistance condition, being convenient to whether vehicle is applicable to road and continuing currently to provide test figure, be convenient to highway administration department and take corresponding measure, ensure traffic safety.
A method of testing for pavement skid resistance condition, this method of testing implements based on aforesaid proving installation, and described method of testing comprises the steps:
(1) test specimen is fixed on testing table, and clean to the test zone cleaning of major general's surface of test piece;
(2) first surface of test piece is sprayed water before test, keep surface of test piece moistening, set the temperature humidity parameter in environment control case;
(3) experimental wheel is placed in surface of test piece, and needs according to test the angle setting balance weight and pole and transverse link on pole;
(4) start drive motor motoring ring test wheel by static setting in motion, rise to test speed V
arear maintenance velocity-stabilization, open brake gear and brake experimental wheel, writing speed is from V
abe reduced to the distance of experimental wheel process in during zero and corresponding moment size;
(5) press the operation of step (1) to step (4), replicate determination is no less than 3 times;
(6) press formula M=L*F result of calculation,
In formula: M-moment (Nm),
The distance vector (m) of L-from rotation axis to center of effort,
F-vectorial force (N),
Friction force f during brake is put to the test wheel situation, pavement state, there is larger difficulty owing to directly measuring friction force in the impact of normal pressure and counterweight Q, adopt the moment M size of different time points during the brake of torque sensing system record, during experiment, distance L is the radius R that experimental wheel rotates; The vectorial force F of different time points when therefore going out to brake by moment formula inverse, vectorial force F is larger, shows that the friction force that can provide on road surface is under this condition larger, also just shows that the cling property on road surface is better.
The method of testing of aforesaid pavement skid resistance condition, when described test specimen is asphalt, adopt polylith rut plate to splice, every block plate is of a size of 300mm*300mm*50mm.
The method of testing of aforesaid pavement skid resistance condition, when described test specimen is cement concrete, obtains test specimen after adopting corresponding die trial to build health.
The method of testing of aforesaid pavement skid resistance condition, when described test specimen is cement concrete, adopts the rear assembled test specimen fixedly obtained of actual road surface to be measured cutting.
The invention has the beneficial effects as follows: the present invention compares the method for static measurement in existing specification, test findings is more direct, and have more and have using value, experimental technique, closer to situation during vehicle actual travel, can better react the actual cling property on road surface; Major parameter in test, normal pressure and counterweight Q, test speed V
a, test temperature T and humidity U, all adjustable with vertical direction angle a, different car weight can be simulated, different normal pressure, friction speed, under different temperatures and humidity, vehicle keep straight on turn round time, the cling property on road surface, its result can for design, detection and Maintenance Decision making time; By adopting the mode loaded continuously, the continuous continual road pavement of wheel can be allowed to rub, under tire continuously rubs, ground surface material cling property reduces fast, therefore, by the attenuation of experiment checking and appraising pavement skid resistance condition, and estimate the life-span of ground surface material cling property accordingly, when being convenient to late maintaining maintenance activity, adopt corresponding disposing technique to recover pavement skid resistance condition.
Accompanying drawing explanation
Fig. 1 is the structural representation of the proving installation of pavement skid resistance condition in the present invention one exemplary embodiments.
Embodiment
embodiment 1
The present embodiment provides a kind of proving installation of pavement skid resistance condition, the support 4 comprising the testing table 1 be arranged in environment control case, transverse link 2, pole 3 and be vertically fixed in the middle part of testing table, temperature and humidity control device is provided with in environment control case, can simulated roadway dry, moist, rain, to snow and low temperature to freeze etc. under particular surroundings, the situation of pavement skid resistance condition; Testing table surrounding is provided with the bolt 5 of fixing test specimen, in order to fixing test specimen 12 on testing table, transverse link adopts adjustable length structure, the top of support is provided with torque sensing system 6, torque sensing system is fixedly connected with by rotating shaft one end with transverse link 2, the other end of transverse link passes through pole 3 top of angle adjusting mechanism 7 vertical connecting setting, drive motor and brake gear 8 are installed in the bottom of pole, installation test wheel 9 on the output shaft of drive motor, experimental wheel circles under the driving of drive motor centered by support on testing table; Support is provided with speed and Distnace determination device 10, measures translational speed and the distance of experimental wheel; Pole is provided with counterweight and pressue device 11, normal pressure can be produced downwards, normal pressure and counterweight size adjustable, the Pavement Skid Resistance performance under simulation Different Weight condition.
The method of testing of a kind of pavement skid resistance condition that the present embodiment provides, comprises the steps:
(1) choose test specimen to be placed on rigidity and the enough testing table of size and to be bolted, test specimen is asphalt, polylith rut plate is adopted to splice, every block plate is of a size of 300mm*300mm*50mm, with hairbrush by clean for the cleaning of test specimen measuring point surface, sweep-out pattern is not less than 300mm*300mm;
(2) first surface of test piece is sprayed water before test, keep surface of test piece moistening, set the temperature humidity parameter in environment control case;
(3) experimental wheel is placed in surface of test piece, and needs according to test the angle setting balance weight and pole and transverse link on pole;
(4) start drive motor motoring ring test wheel by static setting in motion, rise to test speed V
arear maintenance velocity-stabilization, open brake gear and brake experimental wheel, writing speed is from V
ato distance and the corresponding torque of zero experimental wheel process; Braking distance S tested person speed V
a, the impact of normal pressure F and counterweight Q, S is less, shows that the friction force that can provide on road surface is under this condition larger, also just shows that the cling property on road surface is better;
(5) press the operation of step (1) to step (4), replicate determination is no less than 3 times;
(6) press formula M=L*F result of calculation,
In formula: M-moment (Nm),
The distance vector (m) of L-from rotation axis to center of effort,
F-vectorial force (N),
Friction force f during brake is put to the test wheel situation, pavement state, there is larger difficulty owing to directly measuring friction force in the impact of normal pressure and counterweight Q, adopt the moment M size of different time points during the brake of torque sensing system record, during experiment, distance L is the radius R that experimental wheel rotates; The vectorial force F of different time points when therefore going out to brake by moment formula inverse, vectorial force F is larger, shows that the friction force that can provide on road surface is under this condition larger, also just shows that the cling property on road surface is better.
Vehicle is when actual travel, and when entering bend because road surface can produce superelevation, road superelevation refers to time road route is turned and offsets away by centrifugal forces affect when tempo turn to reduce vehicle, and high outside and low outside form is made on road surface.Superelevation adjusts by superelevation horizontal wall inscription, generally there is 1.5%-6%, special circumstances can be larger, now there will be difference when tire force and normal traveling, therefore the angle regulator between connecting rod and pole can be utilized to simulate different superelevation sections wheels travel situation, and actual pavement skid resistance condition is detected, obtain a result.Because friction force is subject to test speed V
a, normal pressure F, the impact such as counterweight Q and pavement state, by this experimental technique and relevant device, can probe into Different Effects condition further affects situation to final pavement skid resistance condition.
As above, although represented with reference to specific preferred embodiment and described the present invention, it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite not departing from claims definition, various change can be made in the form and details to it.
Claims (8)
1. the proving installation of a pavement skid resistance condition, it is characterized in that comprising the testing table be arranged in environment control case, transverse link, the pole of vertical setting and the support be vertically fixed on described testing table, the top of described support is provided with torque sensing system, described torque sensing system is fixedly connected with one end of transverse link by rotating shaft, the other end of described transverse link connects pole top by angle adjusting mechanism, drive motor and brake gear are installed in the bottom of described pole, installation test wheel on the output shaft of described drive motor, simultaneously, described support is provided with speed and Distnace determination device, described pole is provided with counterweight and pressue device, when testing, test specimen is fixed on described testing table, and described experimental wheel can circle under the driving of drive motor centered by support on test specimen.
2. the proving installation of pavement skid resistance condition according to claim 1, is characterized in that: described transverse link adopts adjustable length structure.
3. the proving installation of pavement skid resistance condition according to claim 1, is characterized in that: described testing table surrounding is provided with the bolt for fixing test specimen.
4. the proving installation of pavement skid resistance condition according to claim 1, is characterized in that: be provided with temperature and humidity control device in described environment control case.
5. a method of testing for pavement skid resistance condition, it is characterized in that described method of testing implements based on the proving installation according to any one of claim 1-4, and described method of testing comprises the steps:
(1) test specimen is fixed on testing table, and clean to the test zone cleaning of major general's surface of test piece;
(2) first surface of test piece is sprayed water before test, keep surface of test piece moistening, set the temperature humidity parameter in environment control case;
(3) experimental wheel is placed in surface of test piece, and needs according to test the angle setting balance weight and pole and transverse link on pole;
(4) start drive motor motoring ring test wheel by static setting in motion, rise to test speed V
arear maintenance velocity-stabilization, open brake gear and brake experimental wheel, writing speed is from V
abe reduced to the distance of experimental wheel process in during zero and corresponding moment size;
(5) press the operation of step (1) to step (4), replicate determination is no less than 3 times;
(6) press formula M=L*F result of calculation,
In formula: M-moment (Nm),
The distance vector (m) of L-from rotation axis to center of effort,
F-vectorial force (N),
Adopt the moment M size of different time points during the brake of torque sensing system record, during experiment, distance L is the radius R that experimental wheel rotates; The vectorial force F of different time points when therefore going out to brake by moment formula inverse, vectorial force F is larger, shows that the friction force that can provide on road surface is under this condition larger, also just shows that the cling property on road surface is better.
6. the method for testing of pavement skid resistance condition according to claim 5, is characterized in that: when described test specimen is asphalt, and adopt polylith rut plate to splice, every block plate is of a size of 300mm*300mm*50mm.
7. the method for testing of pavement skid resistance condition according to claim 5, is characterized in that: when described test specimen is cement concrete, obtains test specimen after adopting corresponding die trial to build health.
8. the method for testing of pavement skid resistance condition according to claim 5, is characterized in that: when described test specimen is cement concrete, adopts the rear assembled test specimen fixedly obtained of actual road surface to be measured cutting.
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| CN108508190A (en) * | 2018-04-18 | 2018-09-07 | 长沙理工大学 | A kind of vehicle tracking test instrument under simulation braking state |
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| CN110441227A (en) * | 2019-08-13 | 2019-11-12 | 河海大学 | The synchrometer and test method of bituminous concrete antiskid performance and attenuation law |
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| CN110618090A (en) * | 2019-09-27 | 2019-12-27 | 佛山科学技术学院 | Road surface skid resistance testing arrangement |
| CN110629641A (en) * | 2019-09-27 | 2019-12-31 | 齐鲁交通发展集团有限公司 | Device and method for uniformly paving thin-layer modified emulsified asphalt |
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| CN113418861B (en) * | 2021-06-17 | 2022-04-15 | 东南大学 | Device and method for indoor research on decay law of skid resistance of pavement material |
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| CN114047054B (en) * | 2021-11-15 | 2024-03-26 | 中国第一汽车股份有限公司 | Rolling test device and test method thereof |
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