ZFY1.8/40/250適(shi)應于(yu)各種(zhong)地下(xia)礦山及(ji)水利工程的大(da)斷面天(tian)井和溜井的掘進；具(ju)有高效(xiao)(xiao)能、高質量、高效(xiao)(xiao)率的特(te)點，其天(tian)井成(cheng)孔(kong)(kong)(kong)(kong)效(xiao)(xiao)果好，偏斜(xie)率小，孔(kong)(kong)(kong)(kong)壁光(guang)滑。施(shi)(shi)工開始(shi)開鉆(zhan)導孔(kong)(kong)(kong)(kong)孔(kong)(kong)(kong)(kong)徑(jing)250mm,偏移角1%,然后開始(shi)擴孔(kong)(kong)(kong)(kong)到1.5m,工程順利完成(cheng),實踐證明反井鉆(zhan)機施(shi)(shi)工天(tian)井，溜井具(ju)有安全高效(xiao)(xiao)優勢。

打通的250mm小孔

卸反井(jing)鉆機小(xiao)鉆頭

反井(jing)鉆機(ji)1.5米刀盤開始反孔