適用范圍:
用(yong)(yong)于各類鉆孔(kong)(kong)(kong)(kong)先導孔(kong)(kong)(kong)(kong)成孔(kong)(kong)(kong)(kong)后的(de)擴孔(kong)(kong)(kong)(kong)鉆進,適用(yong)(yong)于軟-中硬(f=1-6)地層的(de)鉆進,不宜(yi)在破碎(sui)、裂隙、強研磨性地層使用(yong)(yong)。
技術特點:
常用于孔口段(duan)擴孔施工(gong),加工(gong)成本低,性價比高。
常用規格:
Φ94/133mm、Φ94/153mm、Φ113/193mm、Φ193/300mm等(deng)。