摘要
在粉砂、中砂、卵石等复杂地层施工大口径钻孔灌注桩，要尽量缩短钻孔的裸露（成孔）时间，孔壁稳定是基础，选择与各种地层相适宜的钻头是关键；同时也要正确使用各钻进参数。
The paper introduces the execution of a large diameter bored grouting pile on Jing-Kai High Way across Jing-Shan Railway Interchange During the execution of a large diameter bored grouting pile in the compound formation such as silt, medium sand, pebble and etc, the exposed time for drilled hole should be reduced as much as possible. The hole wall stability is a foundation and it is very important to select drilling bits which are suitable for various formations. Meanwhile. various drilling parameters should also be used correctly.
出处
《矿产勘查》
2001年第5期28-29,共2页
Mineral Exploration
关键词
大口径
成孔
护壁
泥浆
钻头
钻进参数
large diameter, hole forming, dado, mud, drilling bit, drilling parametr
