JPS63156294U - - Google Patents

Info

Publication number

JPS63156294U

JPS63156294U JP4901087U JP4901087U JPS63156294U JP S63156294 U JPS63156294 U JP S63156294U JP 4901087 U JP4901087 U JP 4901087U JP 4901087 U JP4901087 U JP 4901087U JP S63156294 U JPS63156294 U JP S63156294U

Authority

JP

Japan

Prior art keywords

diameter pipe

excavation head

fixing rings

small

main body

Prior art date

1987-04-02

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.)

Pending

Links

• Espacenet
• Global Dossier
• Discuss

• 238000009412 basement excavation Methods 0.000 claims description 3
• 238000010586 diagram Methods 0.000 description 2
• 230000008878 coupling Effects 0.000 description 1
• 238000010168 coupling process Methods 0.000 description 1
• 238000005859 coupling reaction Methods 0.000 description 1
• 238000005553 drilling Methods 0.000 description 1