Title:
METHOD AND DEVICE FOR EXCAVATING VERTICAL SHAFT
Document Type and Number:
Japanese Patent JP3420115
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method and device for excavating a vertical shaft that can easily collect and discharge the excavated soil for enhanced efficiency of excavation by avoiding the use of a hollow pipe that penetrates the ground to be excavated causing a decrease in excavation performance.
SOLUTION: A casing pipe 1 with joints that can be added as excavation progresses, a face plate 2 attached to the lower end of the casing pipe 1, and a plurality of excavating blades 3 disposed on the lower surface of the face plate 2 in such a way as to have a downward pitch toward the center of excavation are prepared. An excavation soil storage hole S is excavated in the center of the bottom face of a vertical shaft excavated, and the casing pipe 1, together with the face plate 2 is rotated so that the bottom face T of the vertical shaft is excavated into a conical shape by the excavating blades 3. The soil excavated is made to drop into the excavation soil storage hole S along the conical bottom face T and is discharged out of the shaft from the storage hole S through the casing pipe 1 by a soil discharge means 5 such as a hydraulic grab.
Inventors:
Shimai Moriyuki
Application Number:
JP17054599A
Publication Date:
June 23, 2003
Filing Date:
June 17, 1999
Export Citation:
Assignee:
Kashima Construction Co., Ltd.
International Classes:
E21B3/02; E21D1/04; E21D1/06; (IPC1-7): E21D1/06; E21B3/02; E21D1/04
Domestic Patent References:
| JP7331978A | ||||
| JP1146018A | ||||
| JP10266194A | ||||
| JP6294277A | ||||
| JP8105054A |
Attorney, Agent or Firm:
Toshitada Takahashi (1 outside)