The instrument used is an asphalt oscillating friction coefficient tester. 1. Selection point: On the test section, the left wheel track in the direction of the taxi, select five representative points, each measuring point is about 5~10m, and the edge of the road should not be less than 1m. 2. Instrument leveling: 1 Place the instrument on the measuring point and make the swinging direction of the pendulum coincide with the driving direction. 2 Turn the leveling screw to center the level. 3, zero adjustment: (1) Loosen the fixed handle, turn the lifting handle, raise the pendulum and swing freely, then tighten the handle. (2) Move the pendulum to the right and press the release switch. The snap ring enters the release switch slot and is in the horizontal release position, then releases the release switch, at which point the pointer should be pulled to the pin. (3) Press the release switch, swing to the left, and move the pointer upwards. When the pendulum reaches the highest position and then fall, use the left hand to catch the pendulum. At this time, the pointer should be zero. If not, it can be zero. Slightly tighten or loosen the felt ring adjustment nut. Repeat this operation until the pointer points to zero. 4. Calibration slide length: (1) Use a brush to remove loose particles and debris on the road surface within the swing range (2) Let the pendulum hang freely, set a standard ruler (126mm) in the direction parallel to the outer side of the rubber piece, loosen the tightening handle, and turn the lifting handle. Slowly lower the pendulum. When the rubber piece on the slip block just touches the road surface, lift it up. Raise the handle to raise the slide block, move the pendulum to the right, and turn the lift handle to lower the pendulum for a distance, then lower the lift handle to move the pendulum slowly to the left until the edge of the rubber piece just touches the road surface, 126mm aligned At one end of the ruler, lift the lift handle by hand to lift the slide block upwards, and move the pendulum to the left, lower the lift handle, and then slowly move the pendulum to the right to make the edge of the rubber sheet touch the road surface again. The distance between the rubber sheet and the contact point of the road surface should be 126mm (sliding length). If it does not meet the 126mm, turn the lifting handle and repeat the above steps for coarse adjustment. When the basic fits 126mm, tighten the fastening handle, then Correct once, if the sliding length does not meet the standard, raise or lower the leveling screw on the front of the instrument base to correct, but level the level bubble. Make the sliding length meet the requirements. Then, place it in the horizontal release position. 5. Measurement: Sprinkle the road with water and scrape it with a rubber brush to wash off the mud, then sprinkle the water, and press the release switch to slide over the road. The pointer can indicate the friction coefficient of the road surface. For the first time, do not record.) When swinging back, hold the swing lever with your left hand, lift the lift handle with your right hand to raise the slide block, move the swing to the right and press the switch to make the swing ring enter the release switch. And set the needle to the pin, repeat this item, measure five times (each time should be sprinkled), record the value of each time. The difference between the five times is not more than three units (ie one of the dials) Half) If the difference is greater than three units, the cause should be checked and the above operations repeated again until the specified requirements are met. 6, the measurement results: (1) The average value of the five readings of each measuring point represents the friction coefficient value of the measuring point, and the average value of the friction coefficient of the five measuring points is used to represent the friction coefficient value of the measuring section. (2) The measurement reading, that is, the reading of the pointer on the dial (referred to as “swing valueâ€), divided by 100, is the friction coefficient of the road surface. For example, the pendulum value of 33, the friction coefficient is 0.33. 7, note: (1) Since the friction coefficient of the road surface is affected by the season and temperature, the test date and the temperature of the wet road surface should be recorded. (2) The test section should describe the type, appearance and age of the pavement structure. (3) When swinging to the left and then returning, be sure to catch the pendulum by hand to avoid damage to the slippery block and the pointer. (4) There should be no obvious convexity and concave shape in the effective range of sliding of the rubber sheet on the slipper block, so as not to affect the measured value. (5) When calibrating the sliding length, the rubber sheet should be in contact with the road surface. It should not be slid forward by the force of the pendulum to avoid the calibration sliding length being too long. (6) The road surface friction coefficient varies along the cross section of the road. Usually the road is small and the road side is large. To reflect the most unfavorable situation of the test road section, the friction coefficient should be selected to be small, and the position where the brake is frequent is used. Reel wheel. (7) When using a new rubber sheet on the slippery block, it should be tested on the dry road for several times before use. The long side of the rubber sheet should not exceed 3.2mm, and the short side should not exceed 1.6mm. Otherwise, the new rubber sheet should be replaced. In addition, the rubber sheet can not be used after being contaminated by oil. The effective use period of the rubber sheet is one year. After one year, no matter whether it has been used or not, it can not be used for measurement. Because the rubber is aging, the elasticity and hardness change. Affect the test results. 1. Selection point: On the test section, the left wheel track in the direction of the taxi, select five representative points, each measuring point is about 5~10m, and the edge of the road should not be less than 1m. 2. Instrument leveling: 1 Place the instrument on the measuring point and make the swinging direction of the pendulum coincide with the driving direction. 2 Turn the leveling screw to center the level. 3, zero adjustment: (1) Loosen the fixed handle, turn the lifting handle, raise the pendulum and swing freely, then tighten the handle. (2) Move the pendulum to the right and press the release switch. The snap ring enters the release switch slot and is in the horizontal release position, then releases the release switch, at which point the pointer should be pulled to the pin. (3) Press the release switch, swing to the left, and move the pointer upwards. When the pendulum reaches the highest position and then fall, use the left hand to catch the pendulum. At this time, the pointer should be zero. If not, it can be zero. Slightly tighten or loosen the felt ring adjustment nut. Repeat this operation until the pointer points to zero. 4. Calibration slide length: (1) Use a brush to remove loose particles and debris on the road surface within the swing range (2) Let the pendulum hang freely, set a standard ruler (126mm) in the direction parallel to the outer side of the rubber piece, loosen the tightening handle, and turn the lifting handle. Slowly lower the pendulum. When the rubber piece on the slip block just touches the road surface, lift it up. Raise the handle to raise the slide block, move the pendulum to the right, and turn the lift handle to lower the pendulum for a distance, then lower the lift handle to move the pendulum slowly to the left until the edge of the rubber piece just touches the road surface, 126mm aligned At one end of the ruler, lift the lift handle by hand to lift the slide block upwards, and move the pendulum to the left, lower the lift handle, and then slowly move the pendulum to the right to make the edge of the rubber sheet touch the road surface again. The distance between the rubber sheet and the contact point of the road surface should be 126mm (sliding length). If it does not meet the 126mm, turn the lifting handle and repeat the above steps for coarse adjustment. When the basic fits 126mm, tighten the fastening handle, then Correct once, if the sliding length does not meet the standard, raise or lower the leveling screw on the front of the instrument base to correct, but level the level bubble. Make the sliding length meet the requirements. Then, place it in the horizontal release position. 5. Measurement: Sprinkle the road with water and scrape it with a rubber brush to wash off the mud, then sprinkle the water, and press the release switch to slide over the road. The pointer can indicate the friction coefficient of the road surface. For the first time, do not record.) When swinging back, hold the swing lever with your left hand, lift the lift handle with your right hand to raise the slide block, move the swing to the right and press the switch to make the swing ring enter the release switch. And set the needle to the pin, repeat this item, measure five times (each time should be sprinkled), record the value of each time. The difference between the five times is not more than three units (ie one of the dials) Half) If the difference is greater than three units, the cause should be checked and the above operations repeated again until the specified requirements are met. 6, the measurement results: (1) The average value of the five readings of each measuring point represents the friction coefficient value of the measuring point, and the average value of the friction coefficient of the five measuring points is used to represent the friction coefficient value of the measuring section. (2) The measurement reading, that is, the reading of the pointer on the dial (referred to as “swing valueâ€), divided by 100, is the friction coefficient of the road surface. For example, the pendulum value of 33, the friction coefficient is 0.33. 7, note: (1) Since the friction coefficient of the road surface is affected by the season and temperature, the test date and the temperature of the wet road surface should be recorded. (2) The test section should describe the type, appearance and age of the pavement structure. (3) When swinging to the left and then returning, be sure to catch the pendulum by hand to avoid damage to the slippery block and the pointer. (4) There should be no obvious convexity and concave shape in the effective range of sliding of the rubber sheet on the slipper block, so as not to affect the measured value. (5) When calibrating the sliding length, the rubber sheet should be in contact with the road surface. It should not be slid forward by the force of the pendulum to avoid the calibration sliding length being too long. (6) The road surface friction coefficient varies along the cross section of the road. Usually the road is small and the road side is large. To reflect the most unfavorable situation of the test road section, the friction coefficient should be selected to be small, and the position where the brake is frequent is used. Reel wheel. (7) When using a new rubber sheet on the slippery block, it should be tested on the dry road for several times before use. The long side of the rubber sheet should not exceed 3.2mm, and the short side should not exceed 1.6mm. Otherwise, the new rubber sheet should be replaced. In addition, the rubber sheet can not be used after being contaminated by oil. The effective use period of the rubber sheet is one year. After one year, no matter whether it has been used or not, it can not be used for measurement. Because the rubber is aging, the elasticity and hardness change. Affect the test results. 1. Selection point: On the test section, the left wheel track in the direction of the taxi, select five representative points, each measuring point is about 5~10m, and the edge of the road should not be less than 1m. 2. Instrument leveling: 1 Place the instrument on the measuring point and make the swinging direction of the pendulum coincide with the driving direction. 2 Turn the leveling screw to center the level. 3, zero adjustment: (1) Loosen the fixed handle, turn the lifting handle, raise the pendulum and swing freely, then tighten the handle. (2) Move the pendulum to the right and press the release switch. The snap ring enters the release switch slot and is in the horizontal release position, then releases the release switch, at which point the pointer should be pulled to the pin. (3) Press the release switch, swing to the left, and move the pointer upwards. When the pendulum reaches the highest position and then fall, use the left hand to catch the pendulum. At this time, the pointer should be zero. If not, it can be zero. Slightly tighten or loosen the felt ring adjustment nut. Repeat this operation until the pointer points to zero. 4. Calibration slide length: (1) Use a brush to remove loose particles and debris on the road surface within the swing range (2) Let the pendulum hang freely, set a standard ruler (126mm) in the direction parallel to the outer side of the rubber piece, loosen the tightening handle, and turn the lifting handle. Slowly lower the pendulum. When the rubber piece on the slip block just touches the road surface, lift it up. Raise the handle to raise the slide block, move the pendulum to the right, and turn the lift handle to lower the pendulum for a distance, then lower the lift handle to move the pendulum slowly to the left until the edge of the rubber piece just touches the road surface, 126mm aligned At one end of the ruler, lift the lift handle by hand to lift the slide block upwards, and move the pendulum to the left, lower the lift handle, and then slowly move the pendulum to the right to make the edge of the rubber sheet touch the road surface again. The distance between the rubber sheet and the contact point of the road surface should be 126mm (sliding length). If it does not meet the 126mm, turn the lifting handle and repeat the above steps for coarse adjustment. When the basic fits 126mm, tighten the fastening handle, then Correct once, if the sliding length does not meet the standard, raise or lower the leveling screw on the front of the instrument base to correct, but level the level bubble. Make the sliding length meet the requirements. Then, place it in the horizontal release position. 5. Measurement: Sprinkle the road with water and scrape it with a rubber brush to wash off the mud, then sprinkle the water, and press the release switch to slide over the road. The pointer can indicate the friction coefficient of the road surface. For the first time, do not record.) When swinging back, hold the swing lever with your left hand, lift the lift handle with your right hand to raise the slide block, move the swing to the right and press the switch to make the swing ring enter the release switch. And set the needle to the pin, repeat this item, measure five times (each time should be sprinkled), record the value of each time. The difference between the five times is not more than three units (ie one of the dials) Half) If the difference is greater than three units, the cause should be checked and the above operations repeated again until the specified requirements are met. 6, the measurement results: (1) The average value of the five readings of each measuring point represents the friction coefficient value of the measuring point, and the average value of the friction coefficient of the five measuring points is used to represent the friction coefficient value of the measuring section. (2) The measurement reading, that is, the reading of the pointer on the dial (referred to as “swing valueâ€), divided by 100, is the friction coefficient of the road surface. For example, the pendulum value of 33, the friction coefficient is 0.33. 7, note: (1) Since the friction coefficient of the road surface is affected by the season and temperature, the test date and the temperature of the wet road surface should be recorded. (2) The test section should describe the type, appearance and age of the pavement structure. (3) When swinging to the left and then returning, be sure to catch the pendulum by hand to avoid damage to the slippery block and the pointer. (4) There should be no obvious convexity and concave shape in the effective range of sliding of the rubber sheet on the slipper block, so as not to affect the measured value. (5) When calibrating the sliding length, the rubber sheet should be in contact with the road surface. It should not be slid forward by the force of the pendulum to avoid the calibration sliding length being too long. (6) The road surface friction coefficient varies along the cross section of the road. Usually the road is small and the road side is large. To reflect the most unfavorable situation of the test road section, the friction coefficient should be selected to be small, and the position where the brake is frequent is used. Reel wheel. (7) When using a new rubber sheet on the slippery block, it should be tested on the dry road for several times before use. The long side of the rubber sheet should not exceed 3.2mm, and the short side should not exceed 1.6mm. Otherwise, the new rubber sheet should be replaced. In addition, the rubber sheet can not be used after being contaminated by oil. The effective use period of the rubber sheet is one year. After one year, no matter whether it has been used or not, it can not be used for measurement. Because the rubber is aging, the elasticity and hardness change. Affect the test results. 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