JPS6245953B2 - - Google Patents
Info
- Publication number
- JPS6245953B2 JPS6245953B2 JP13934682A JP13934682A JPS6245953B2 JP S6245953 B2 JPS6245953 B2 JP S6245953B2 JP 13934682 A JP13934682 A JP 13934682A JP 13934682 A JP13934682 A JP 13934682A JP S6245953 B2 JPS6245953 B2 JP S6245953B2
- Authority
- JP
- Japan
- Prior art keywords
- drill pipe
- expansion
- drilling bit
- bit
- expanding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005553 drilling Methods 0.000 claims description 42
- 238000009412 basement excavation Methods 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 238000010276 construction Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13934682A JPS5931392A (ja) | 1982-08-11 | 1982-08-11 | 拡底用回転掘削ビツト装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13934682A JPS5931392A (ja) | 1982-08-11 | 1982-08-11 | 拡底用回転掘削ビツト装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5931392A JPS5931392A (ja) | 1984-02-20 |
| JPS6245953B2 true JPS6245953B2 (enExample) | 1987-09-29 |
Family
ID=15243184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13934682A Granted JPS5931392A (ja) | 1982-08-11 | 1982-08-11 | 拡底用回転掘削ビツト装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5931392A (enExample) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63184612A (ja) * | 1987-01-27 | 1988-07-30 | Hitachi Constr Mach Co Ltd | 拡底掘削機 |
-
1982
- 1982-08-11 JP JP13934682A patent/JPS5931392A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5931392A (ja) | 1984-02-20 |
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