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Don't forget to tamp the hole well. Tamping is as important as the hole depth.
别忘了填井, 填井和井深一样重要.
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The edge distance or span of the Concrete Anchor Bolts is 3.5 times hole depth.
膨胀螺栓与混凝土结构边缘的间距,膨胀螺栓之间的间距,宜大于3.5倍孔深.见下图.
炮眼深度???由炮眼底至工作面的垂直距离。???
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