Title:
ROTARY PENETRATION STEEL PIPE PILE AND METHOD FOR CONSTRUCTING ROTARY PENETRATION STEEL PIPE PILE
Document Type and Number:
WIPO Patent Application WO/2023/013563
Kind Code:
A1
Abstract:
Provided are: a rotary penetration steel pipe pile which is placed so as to be located in an intermediate layer without allowing a pile end to reach a bearing layer, and can exhibit a sufficient bearing capacity and reduce cost; and a method for constructing the rotary penetration steel pipe pile. A rotary penetration steel pipe (1) according to the present invention is placed so as to be located in an intermediate layer without allowing a pile end to reach a bearing layer, and has: a single-turn lowermost blade (3) provided in the vicinity of the pile end and having a substantially spiral shape; and a single-turn upper blade (5) provided in a plurality of stages above the lowermost blade (3) at regular intervals in the range of 1.25 to 7.5 times the blade diameter. The outer diameter of the lowermost blade (3) is set to be larger than the outer diameter of the upper blade (5) and 1.5 to 3 times the pile diameter. The outer diameter of the upper blade (5) is set to be smaller than the outer diameter of the lowermost blade (3) and smaller than or equal to 1.6 times the pile diameter, and the pitch thereof is set to be the same as the pitch of the lowermost blade (3).
Inventors:
KAWAI MARINA (JP)
SHINOHARA TOSHIO (JP)
FUKAYA TOSHIYUKI (JP)
SHINOHARA TOSHIO (JP)
FUKAYA TOSHIYUKI (JP)
Application Number:
PCT/JP2022/029408
Publication Date:
February 09, 2023
Filing Date:
July 29, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
CHIYODA GEOTECH CO LTD (JP)
CHIYODA GEOTECH CO LTD (JP)
International Classes:
E02D5/56
Domestic Patent References:
| WO2015141639A1 | 2015-09-24 |
Foreign References:
| JPH01142122A | 1989-06-05 | |||
| JP2002348864A | 2002-12-04 | |||
| JP2009209675A | 2009-09-17 | |||
| JPH11303069A | 1999-11-02 | |||
| JP2016125316A | 2016-07-11 | |||
| JPH0198231U | 1989-06-30 | |||
| JP2015143462A | 2015-08-06 | |||
| JP2004011204A | 2004-01-15 | |||
| US20150368870A1 | 2015-12-24 | |||
| JPH09195271A | 1997-07-29 | |||
| JP2006283341A | 2006-10-19 | |||
| JP2005299192A | 2005-10-27 | |||
| JP6749718B1 | 2020-09-02 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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