2) bore expanded hole
钻孔扩孔
3) piercing
[英]['pɪəsɪŋ] [美]['pɪrsɪŋ]
钻进;钻孔
4) Piercing reaming
火钻扩孔
5) Ream bit
扩孔钻头
1.
When wind force cutting pick-up drilling is applyed in coal seam if dedusting equipment is installed in the opening of the bore,it should enlarge drilling bore with ream bit so that dedusting equipment can be installed,and then retreat drilling and replace bit of drill.
在煤层采用风力排渣打钻时,如果在钻孔孔口处安装除尘设备,在打钻前要采用扩孔钻头打一个能够安装除尘器的钻孔,然后退钻更换钻头钻进。
6) bored and bottom-enlarging
钻孔扩底
1.
This paper introduces boring method of bored and bottom-enlarging mudjack pile in dry operation.
本文简单介绍了干作业钻孔扩底桩的成孔处理方法。
补充资料：扩孔
holeexpansion：减小空心毛坯壁厚而增加其内、外径的锻造工序称为扩孔。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条