Title:
DRAINAGE BORING
Document Type and Number:
Japanese Patent JP3163367
Kind Code:
B
Abstract:
PURPOSE: To drill a hole and install a drainage pipe in the hole in less numbers of process without flowing out of sand by treating only water and prevent sand after the installation by using the drainage pipe as a screen pipe and take in only water and perfectly prevent sand from flowing out during the work and also after the work.
CONSTITUTION: A guide pipe 2 in which a cut-off box 4 is attached to the opening of hole is installed. A lost bit 6 with a check valve 5 is provided at the front end thereof. A casing 7 in which the nearby place of the front end is formed as a screen pipe 9 and the upper part is formed as a pipe 15 without holes, is inserted in the guide pipe 2. An inner rod 34 is connected to the lost bit 6 and water passing the inner rod 34 is poured from the lost bit 6 at the front end on excavating to drain water and discharge mud from the clearance around the casing 7. After completion of boring only the inner rod 34 is removed.
Inventors:
Hashimoto, Akira
Eto, Masatsugu
Okada, Yasuhiro
Higuchi, Akira
Eto, Masatsugu
Okada, Yasuhiro
Higuchi, Akira
Application Number:
JP1994000147794
Publication Date:
March 02, 2001
Filing Date:
June 29, 1994
Export Citation:
Assignee:
NITTOC CONSTR CO LTD
HIGUCHI GIKOU:KK
HIGUCHI GIKOU:KK
International Classes:
E02D19/10; E02D3/10; E02D19/00; E02D3/00; (IPC1-7): E02D3/10