Tandem Roller. Monday , June 04th , 2018 - 15:04:43 PM
The final wear course of asphalt concrete (a.k.a. asphalt or blacktop in North America or macadam in England) is laid using a paver and compacted using a tandem smooth drum roller a three-point roller or a pneumatic tyre roller. Three point rollers on asphalt were very common once and are still used but tandem vibrating rollers are the usual choice now with the pneumatic tyre roller s kneading action being the last roller to seal off the surface.
The next machine is usually a single smooth drum compactor that compacts the high spots down until the soil is smooth and this is usually done in combination with a motor grader to get a level surface. Sometimes at this stage a pneumatic tyre roller would be used. These rollers feature two rows (front and back) of pneumatic tyres that overlap and the flexibility of the tyres provides a kneading action that seals the surface and with some vertical movement of the wheels enables the roller to operate effectively on uneven ground. Once the soil base is flat the pad drum compactor is no longer used on the road surface.
Since the idler gear contacts directly both the smaller and the larger gear it can be removed from the calculation also giving a ratio of 42/13≈3.23. The idler gear serves to make both the drive gear and the driven gear rotate in the same direction but confers no mechanical advantage.
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