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.

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