| 摘要 |
<p>The anchor secures portions of rock, or structures to rock. The structure includes a tension member, which is pref. pre-stressed. The member is inserted in a bore-hole in the rock and it is secured thereby a hardening material. A heater warms this materil to the necessary temp. and maintains the correct temp. during the whole of the hardeningperiod. It can be fixed to the tension member, and encloses this tension member at the anchoring portion and it is situated in the annular space between it and the borehole wall.</p> |
