Title:
CASING TUBE
Document Type and Number:
Japanese Patent JP3299023
Kind Code:
B2
Abstract:
PURPOSE: To provide a casing tube which can excavate the ground in order to draw out an existing pile without damaging it.
CONSTITUTION: A spiral blade 16 in which an existing pile 15 can be inserted is formed at the inner periphery of a casing tube 10 having a diameter with which the casting tube defines a predetermined gap A between itself and the outer periphery of the existing pile 15, extending from the front end to rear end of the casing tube 10 which is therefore thrust into the ground by swinging or rotating the casing tube 10. The ground is excavated by cutting blades 17, 18 at the front end of the casing tube 10 while sediment around the pile 15 is discharged upward in order to remove friction between the pile 15 and the ground, thereby it is possible to easily withdraw the pile 15.
Inventors:
Akira Iwakura
Application Number:
JP1460494A
Publication Date:
July 08, 2002
Filing Date:
February 08, 1994
Export Citation:
Assignee:
Nippon Vehicle Manufacturing Co., Ltd.
International Classes:
E21B17/00; E02D9/02; (IPC1-7): E02D9/02; E21B17/00
Domestic Patent References:
| JP51121907A | ||||
| JP615121A |
Attorney, Agent or Firm:
Tsutomu Adachi