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Pre-boring and final setting by blowing
Pre-boring and final setting by blowing
The example is shown although there are some from which a construction process differs.

After carrying out precedent boring by Auger and injecting slurry for to stabilize the pile circumference, the pile having a special tip shoe and tip metallic is inserted into the bored hole, a top or a tip part is driven by free drop hammer, and bearing capacity is made to ensure.  

It can construct in a comparatively low vibration and noise, and evaluation of the bearing capacity calculation formula is higher than a pre-boring with root hardening cement slurry method of construction.

For application of pile diameter, about 300-600mm and the maximum pile length are about 40m.

1) Boring to specify depth by Earth Auger, and pull it up while injecting hardening slurry at　the bottom part of bored hole.
2) The pile that attached the movable shoe in the tip part is inserted  in a hole.
3) Drive the movable shoe at the tip of a pile with a drop hammer in a pile hollow part.
4) Place cement paste in a pile tip part, and unify a movable shoe and the main part of a pile.