HAND BOMAG ROLLERS,TADEM ROLLERS AND ARTICULATED ROLLERS:

HAND BOMAG ROLLERS,TADEM ROLLERS AND ARTICULATED ROLLERS:

The hand roller is one of vibratory group available in single drum version or tandem rollers. These rollers are self-propelled with reversible travel direction. The steering rod is the control point however comparing with tampers and plates rollers their mobility enhances the compaction work. These rollers can be used both earthwork and asphalt compaction and most frequently for small area repair and patch work. Single drum rollers work with weights of 160 to 460kg and amplitude between 0.4 and 0.5mm. Hand guided tandem rollers have two drums of identical size with relatively small diameter. Tandem rollers are controlled by hydraulic which reduces controlling effort. On compacting the asphalt material the hydra statically driven system is applied to smoothen the layer. These tandem rollers have also two drums of identical diameter, each eguiped with a exciter shaft although the machines are powered by an air cooled engine.Travel and vibration systems are hydraulically driven.

The tandem rollers are available with hydrostatic articulated steering, heavier versions alternatively hydrostatic pivot steering. In these group there is light and heavy tandem rollers whereby they differ according to compaction capability. The heavy tandem has higher mobility and faster more manoeuvrable than light tandem rollers. These heavy tandem rollers are also known as articulated tandem rollers which are normally used for compaction of asphalt material. These rollers are eguipped  with washing sprinkler systems. These articulated machines are generally designed with double drum vibration and double drive which normally work with one freguency.According to engineers specification the machines sufficient power range from 3 to 4.5 t which is used  behind to paver with an output of 500 to 800m squre. The  heavy tandem rollers are equipped with automatic vibration, a system which swithes the vibration off when stopping the machine or change travel direction, thereby avowing tranverse depression and unevenness in asphalt course. Spit and non-split drums are very important in that they reduce the risk of shoving and cracking when compacting in tight curves. Tandem rollers are classified in two that is articulated steering and pivot steering, which enable different modes of steering. In conclusion rollers are foundation stability in road construction.