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HOLLOW ROCK BOLT, SELF -DRILLING ROCK BOLT AND METHOD OF FORMING A HOLLOW ROCK BOLT
HOLLOW ROCK BOLT, SELF -DRILLING ROCK BOLT AND METHOD OF FORMING A HOLLOW ROCK BOLT
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机译:空心岩石螺栓,自钻式岩石螺栓和形成空心岩石螺栓的方法
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摘要
A hollow rock bolt comprising a shaft having a spiral form protruding from the exterior surface of the shaft, wherein the spiral form has a flank angle of between 30° and 60°.
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