Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
Chinese
⇄
English
G
o
o
g
l
e
|
Forvo
|
+
覆盖层钻孔法
该法用于开挖有软弱覆盖表土层的基岩。它的要点是:在外套管中用旋转钻孔法穿透覆盖层,到达坚硬岩层时,再在内套管中以旋转冲击方式钻孔。钻到设计深度后在炮孔中插人塑料管,防止软弱覆盖层崩坍堵孔,并通过它往孔中装药起爆,简称 OD 法
expl.
overburden drilling method
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">
Add
|
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">
Report an error
|
Get short URL
|
Language Selection Tips