INTERNAL EXCAVATION METHOD THROUGH PILE, AND FOUNDATION PILE STRUCTURE

WIPO Patent Application WO/2004/035942

A1

An internal excavation method through a pile, comprising the steps of (a) fitting a tip metal device (13) to an existing concrete pile (1), inserting an excavating rod (15) without a soil discharging mechanism into the existing concrete pile, and excavating by a rotary excavating arm (21) of an excavator head (18) to immerse the existing pile (1), (b, c, d) excavating a ground, while loosening, with a diameter 1.4 times the outer diameter of the existing pile (1) or more and stamping the loosened excavated soil to the outside by the outer face of the exiting pile (1), and filling, agitating, and mixing cement mill in stratums (26A, 26B) designated by design to form solidified mixed layers (29A, 29B) with recovered or improved ground strength, (e) forming a foot protection layer (30) filled with cement mill on a pile hole bottom (31) side, and (f) raising the excavating head (18) to the ground, lowering the existing pile (1), and positioning the tip metal device (13) in the foot protection layer (30), whereby a supporting force of approx. two times that of an existing internal excavation method can be developed, and a soil discharge amount can be remarkably decreased.

KIYA YOSHINOBU (JP)

PCT/JP2003/012522

April 29, 2004

September 30, 2003

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MITANI SEKISAN KK (JP)
KIYA YOSHINOBU (JP)

E02D5/62; (IPC1-7): E02D7/28

JP2000144727A	2000-05-26
JPH0325121A	1991-02-01
JPH02108724A	1990-04-20

Suzuki, Shoji (16-2 Samonch, Shinjuku-ku Tokyo, JP)

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