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水布垭左岸防淘墙中布置了3排锚索,来增加自身的稳定性。锚索钻孔时遇到软弱破碎的堆积体坡积物及强度高、硬度大的铁质石英砂岩等复杂地质情况;上部锚索孔要穿透相距50余m的拉锚洞和防淘墙廊道侧壁,钻孔精度要求高。施工中及时总结并制定出以风动潜孔冲击锤、偏心跟管钻进合理组合的钻孔施工方法,对孔斜进行了有效控制,对孔内事故处置有预案,提高了钻孔工效、获得满意效果。
Shuibuya left bank anti-pan-Tao in the layout of the three rows of anchor cable to increase their stability. When the anchor cable is drilled, it encounters complex geological conditions such as the weak and broken accumulation body slope sediment and the iron ore quartz sandstone with high strength and hardness. The upper anchor hole must penetrate the anchor hole and the anti-scouring wall Corridor sidewall, drilling accuracy requirements. During the construction, a drilling construction method with a combination of pneumatic down-hole impact hammer and eccentric-tube drilling was summarized and formulated in time to effectively control the hole inclination and preplan the accident disposal in the hole to improve the work efficiency of drilling, Get satisfactory results.