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Title:
ROTARY PRESS-IN STEEL PIPE PILE
Document Type and Number:
WIPO Patent Application WO/2021/235450
Kind Code:
A1
Abstract:
Provided is a rotary press-in steel pipe pile which can prevent or reduce damage caused by resistance during penetration, without preventing smooth penetration characteristics into the ground and expression of supporting force.　A rotary press-in steel pipe pile 10 is a steel pipe pile with a blade which has a spiral blade 12 at the tip thereof, and which is rotated and pressed into the ground by drilling performed by the spiral blade 12 while rotating. The spiral blade 12 is provided with an opening having an area from 0.1 to 0.9 times inclusive of an area of a circle, the diameter of the circle being the outside diameter of the steel pipe pile, and is welded and fixed concentrically to a steel pipe pile tip part 13 having an asymmetric tip shape when viewed from a side. The spiral blade 12 projects to the inside and outside of the steel pipe pile 10.

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Inventors:
SAWAISHI MASAMICHI (JP)
OKI HITOSHI (JP)
FUKUMURA KOKA (JP)
SHOJI TOMOYUKI (JP)
SAWADA TAKESHI (JP)
Application Number:
PCT/JP2021/018853
Publication Date:
November 25, 2021
Filing Date:
May 18, 2021
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
E02D5/56
Domestic Patent References:
WO2010116884A12010-10-14
Foreign References:
JP2004019238A2004-01-22
JP2005220662A2005-08-18
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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