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Compacting In Small Space-Tamping Rammer

2015-6-15 14:49:02

The rammer, also called a tamperrammer,  is the brute-force member of the light-compaction-equipment family, using percussive action to consolidate material, versus the high-frequency vibratory action of plate compactors, walk-behind rollers, and trench compactors.

The vibratory action of the latter three machines results from rapidly rotating shafts with eccentric weights (exciters), while the percussive force of most rammers results from the action of two large springs that are cycled via linkage driven by the rammer’s engine. A plate compactor’s vibration system, for example, might cycle 4,000 or more times per minute and move its plate vertically just a fraction of an inch; a rammer, on the other hand, might deliver only 600 blows per minute and move its tamping foot vertically 3 inches or more.

The rammer’s percussive force makes it a good tool for compacting cohesive materials—usually soils with high clay content—because the shearing action of the machine’s foot breaks bonds between soil particles and displaces air and water trapped between soil layers. On many job sites, however, especially where space is tight, the rammer is the compaction tool of choice and used in a variety of soil types.

Most rammers use a four-stroke-cycle (four-cycle) gasoline engine, which has largely displaced two-stroke-cycle (two-cycle) engines that were once widely used, because the two cycle’s lack of an oil sump eliminated fouling the cylinder, air filter, muffler or carburetor with oil if the rammer tipped over. The design of many small four-cycle engines today eliminates that problem, however, accounting for the four-cycle’s general use—although some rammers still use two-cycle engines and a few use diesel engines.

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