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Hydraulic Hammer Method
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Percussion method is the best among ready-made pile driving methods because of high bearing capacity and low cost .
Hydraulic Hammer method use Hydraulic cylinder to lift up the ram
Superior to diesel hammer type regarding environment because of no scattering of fuel oil
Working efficiency is very high because of high speed of tamping by adoption of free drop way.
Can adjust percussion energy for the most suitable to pile strength by adjusting height of ram. It can secure stability and suitable designed bearing capacity of ground

Item	Hydraulic hammer	Diesel hammer
Adjust the falling height of ram	Possible	Impossible
Noise	Low	High
Scattering of fuel oil	No	Yes
Weight ratio against identical energy	Heavy	Light
Superiority according to working ground	Soft ground	Hard Ground
Tamping efficiency	High (DKH=75~100%)	Low ( Less than 30% )
Change at Tamping efficiency based on heat	Light	Heavy

1. Set the order of construction management for pilot percussion
2. Decide height of ram
3. It is recommended to keep tamping height lower than allowed
4. Check penetrated depth whether penetrated as planned depth
Check tamping sound of hammer and vibration of hammer. When it reached the fixed bearing layer, the sound will be bigger and hammer body will rebounded
5.Try retesting percussion when it is not reached at fixed bearing layer.
6. When it reached, record the depth of penetration and rebound volume on pilot report
7. Put those results on the calculation formula of active bearing force and confirm whether the results are larger than the designed bearing capacity.
8. Decide the final height of ram based on result
9. If you have any doubt of the above items, adopt Dynamic Loading Test (PDA) or Static Loading Test to insure.