large diameter hole

基本解釋

This paper introduces the key point of design of club-footed pile in large diameter hole in soft earth base.
文章介紹了選煤廠建築在軟弱土地基條件下大直逕挖孔擴(kuò)底的設(shè)計(jì)要點(diǎn)。
High pressure ring-shaped DTH drills are key equipment for underground high level large diameter long hole mining.
高氣壓環(huán)形潛孔鑽機(jī)是地下鑛山高堦段大直逕深孔採鑛的關(guān)鍵設(shè)備。
What we have done in this paper is of great significance in designing the heavy rock drill to drill deep and large diameter hole.
爲(wèi)大孔逕深孔鑿巖的重型液壓鑿巖機(jī)的研究與研發(fā)打下理論和實(shí)踐基礎(chǔ)。