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BSP 300N - 600N Air Hammer
 Trench Control hire out the 300N 500N and 600N hammers. These are all well proven double acting impact pile hammers designed for operation by compressed air. These free hanging hammers are normally used in crane suspended mode and are generally employed to drive lighter sections of piles.
The tractomat is an air operated extractor hammer designed for economical recovery of trench sheets where ground conditions are often difficult.
Method
The air arrives under pressure in a valve box containing a slide valve, which sends it alternatively to each side of the ram, while the opposite side is connected to the exhaust ports. When falling, the ram hits a flat anvil, the pressure lifts the ram and allows it to be forced down again on to the anvil. The energy of each impact being transferred to the driven element.
The Air hammers rely on high speed of impact of the ram and the high number of impacts. The ram weight of double-acting air hammers tend to be only 10 - 20% of the overall hammer weight, but this is effectively increased by the pressure ( 5 - 8 bar) on the upper end of the ram. Up to 90% of the available energy blow is derived from the action of the air upon the ram.
It is not advisable to insert a driving cap between the hammer anvil and the element being driven since this leads to an enormous loss of efficiency.
In normal operation, the Air hammer is straddled over the sheet, the leg guides enabling stability and correct sheet alignment. Some Air hammers feature air-powered clamps that act continuously, or periodically at the moment of impact. These are present to prevent reaction bouncing at impact, and maximise the blow efficiency. These clamps are not designed to pitch sheets, and this should never be attempted, always use a quick release shackle.
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