| 摘要 |
<p>In a process for positioning of a strengthening rod in mine levels and public works, a thermosetting resin compsn. is introduced into a long bore made in the surface to be strengthened, together with a metal rod of substantially the same length as the bore. The rod is rotated at a speed such that it heats up by friction to the hardening temp. of the compsn. The rod is sealed in the bore by the hardening of the compsn. With this process it is possible to mechanise completely the positioning of the rods, while avoiding any installation for heating the rods beforehand.</p> |
