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 IHC HYDROHAMMER - OPERATING PRINCIPLE
The operating cycle begins with an upward movement involving the lifting of the ram (incorporating the ram, the ram point and the piston rod). Valve P in the pressure line is open and valve R in the return line is closed. Once the preset stroke has been reached, valve P closes and valve R opens, allowing the ram to start its downward movement. The ram is accelerated by a pressurised gas buffer above the main pistonnes, giving the ram an acceleration of up to 2 g. This reduces the actual stroke required and increases the blow rate of the hammers.
The ram is guided by upper and lower oil or grease lubricated bearings. This eliminates nearly all wear on the ram and allows the hammer to work at all inclinations, even horizontally in theory.
At impact the ram strikes either a solid steel anvil (for steel piles) or a helmet (for concrete piles). The helmet contains a hammer cushion at the top and a pile cushion at the bottom. All IHC hammers can be operated leader guided or free hanging, both above and below water.
- Valve plate
- Upper leader attachment
- Accumulator
- Pistonnes
- Upper bearing
- Hammer housing
- Ram
- Lower bearing
- Lower leader attachment
- Shock absorber
- Pile sleeve
- Pile
- Anvil/helmet
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