Patent ID: 6749372
Filing Date: 2004-06-15
Classification: E02D

Abstract:
A method for forming an underground shell-pile continuous wall, comprising the steps of:a) attaching a circular pile shoe having cutting faces on the bottom end of a barrel core space of each special-drill building cluster of shell-piles; b) locating a first special drill on the job position vertically standing on said pile shoe, and exert pressure on a vibrating head at the tip end of said special drill to press said special drill sinking into the ground to get a desired depth in the soft soil layer, the expelled soil is driven out along the inside wall of inner draining hole of said first special drill; c) locating and connecting a second special drill with the first special drill by coupling a male connector of the second special drill to a female connector of the first special drill, and process the second special drill as described in step b to sink into the desired depth; d) pouring concrete from a loading hopper of the first special drill, vibrate said special drill as pouring, and withdraw up said special drill simultaneously to depart said pile shoe from the bottom end of said barrel core space until the first special drill is dragged out from the ground completely to build a first shell pile; e) attaching a new pile shoe on the used first special drill or prepare a third special drill, repeat the step c to locate and connect the new special drill to the second special drill, and sink into the desired depth; f) repeating step d to withdraw the second special drill to form a second clustering shell pile in contact with the first shell pile; and g) repeating steps c through f until the underground shell-pile continuous wall is completed.