加拿大威廉斯有限公司,制作了一种适合于采矿业和建筑业的高拉力“旋锁”岩石螺拴。在硬岩石和混凝土基础上,用来在坑道顶部悬挂设备(图1),拉紧钢丝绳(图2)和安装各种机器设备地脚螺栓(图3)。这种方法可大大节省时间。使用时只须把“旋锁”螺栓放入已钻好的岩孔中,用搬手旋紧螺帽,锥形螺母(注意在它的母线方向有凸 Williams, Inc. of Canada, has produced a high tensile “twistlock” rock bolt suitable for the mining and construction industries. Based on hard rock and concrete, used to hang equipment at the top of the tunnel (Figure 1), tighten the wire rope (Figure 2) and install various machine equipment anchor bolts (Figure 3). This method can save time. Use only the “twist lock” bolt into the hole has been drilled, tighten the nut with a hand, tapered nut (note that in its generatrix direction convex