Title:
地盤改良装置及び地盤改良方法
Document Type and Number:
Japanese Patent JP7393453
Kind Code:
B2
Abstract:
To provide a ground improvement device capable of securely reducing excess pore water pressure over hydrostatic pressure upon construction of a sand pile and shortening construction hours.SOLUTION: A ground improvement method for constructing a sand pile by repeating discharge and driving-back of sand pile material S when penetrating a casing pipe 20 in a ground D as rotating the same and pulling out the same includes: arranging a long-groove-shaped concave part 21 on the outer periphery of the casing pipe 20 so as to extend in a longitudinal direction Y; receiving discharge material 22 in the long-groove-shaped concave part 21; and sealing openings 21a of the long-groove-shaped concave part 21 having received the discharge material 22 with a lid body 23 having water entering holes 23a, to discharge pore water W to the ground through the discharge material 22 by making the pore water W between underground soil grains enter the inside of the long-groove-shaped concave part 21 from the water entering holes 23a of the lid body 23 upon occurrence of the pore pressure over a hydrostatic pressure during penetration and pulling-back of the casing pipe 20.SELECTED DRAWING: Figure 5
Inventors:
Yuji Yamashita
Kenji Harada
Kenji Harada
Application Number:
JP2022022198A
Publication Date:
December 06, 2023
Filing Date:
February 16, 2022
Export Citation:
Assignee:
Fudo Tetra Co., Ltd.
International Classes:
E02D3/10
Domestic Patent References:
| JP8041851A | ||||
| JP2015052253A | ||||
| JP2010013885A | ||||
| JP61151309A | ||||
| JP2132219A | ||||
| JP4115011A |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Masakazu Ito
Masakazu Ito
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