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Exploration hole drilling in Guilin Xiong Bei Ling tunnel

Details：SANYOU | 2021-01-20

桂林熊背嶺公路隧道勘查孔鉆探報道續：桂林三友王牌金剛鉆，堅硬打滑地層特制產品，0-5B配方進口料繩索鉆頭，鉆進下圖堅硬鈣質砂巖，班進尺15-20米，總進尺165米。

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