Title:
【発明の名称】空気式揚昇法用の穿孔装置
Document Type and Number:
Japanese Patent JP3260766
Kind Code:
B2
Abstract:
A drilling tool for drilling bore holes into the ground and for removing the drilled material using an air-lifting process. The drilling tool has a drilling head equipped at its lower surface with curing elements, whose upper surface is connected to hollow drilling rods having an inner conveying channel and from whose lower surface boring material mixed with a rinsing liquid is removed via the conveying channel. At the lower surface of the drilling tool head, inside a radial channel connected to the conveying channel, a cross-flow of the rinsing liquid, flowing radially inwards and having a high flow velocity, is produced for the purpose of carrying along the boring material.
Inventors:
Zibsek, Fritz
Application Number:
JP50371498A
Publication Date:
February 25, 2002
Filing Date:
May 14, 1997
Export Citation:
Assignee:
Bilt Maschinen-Und Borgerete-Fabrik Gaembacher
International Classes:
E21B3/00; E21B10/04; E21B10/06; E21B10/18; E21B10/28; E21B21/12; E21B21/14; (IPC1-7): E21B10/28; E21B3/00
Domestic Patent References:
| JP5061006A | ||||
| JP525988A | ||||
| JP4872906A |
Attorney, Agent or Firm:
Takehiko Suzue (4 outside)