摘要
在易坍塌地层进行大口径灌注桩孔施工中，利用反循环钻进工艺，进行大口径灌注桩孔和排出渣土；采取超长护筒护壁的方法，这一技术措施是成功的，有效的。
The technological method of using ultralong protection pipe to protect the hole wall is very
successful and effective when,based on reverse circulation drilling technology,Large diameter
grouthole is worked in caving ground.
出处
《矿产与地质》
1999年第2期128-129,共2页
Mineral Resources and Geology
关键词
岩土工程
钻进工艺
超长筒护壁
灌注桩
建筑
Engineering of soil and rock,Drilling
technology,Ultralong pipe to protect the hole wall
