DRILLING AND STIRRING DEVICE AND METHOD FOR CONSTRUCTING GROUND IMPROVEMENT BODY USING SAME

WIPO Patent Application WO/2022/009439

A1

This device comprises: drilling blades 2 which are mounted to a rotating shaft 1 to excavate earth, and which have a first diameter D1; and a co-rotation prevention blade having a boss part 3 loosely fitted to the rotation axis and having a second diameter D2. A conditional engagement part 30 is provided only on the upper side of the boss part 3. The conditional engagement part 30 engages the boss part 3 with the rotating shaft 1 when the rotating shaft 1 rotates in a first rotation direction, but does not engage the boss part 3 with the rotating shaft 1 when the rotating shaft rotates in a second rotation direction. If the condition that drag on the co-rotation prevention blade 5 acts on the upper side and the rotating shaft rotates in the first rotation direction is satisfied, the co-rotation prevention blade 5 rotates synchronously with the drilling blades 2 to configure an enlarged-diameter part 11 having the second diameter D2.

JP2005113046	GROUT
JPH0657939	[Title of the Invention] Ground improvement method and apparatus by blowing fine powders and granules
JPS59173417	INJECTION OF GROUT MIXED WITH BLOWING AGENT

USUI HIROFUMI

PCT/JP2020/036063

January 13, 2022

September 24, 2020

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TENOX KYUSYU CORP (JP)

E02D3/12; E02D5/46; E02D5/48

JPH07109732A	1995-04-25
JP2002309568A	2002-10-23
JP2003278146A	2003-10-02
JPH0354882U	1991-05-27
JP5652972B1	2015-01-14
JPH0493410A	1992-03-26
JP2002294698A	2002-10-09
JP2000045274A	2000-02-15

HIRANO, Kazuyuki (JP)

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