| 摘要 |
<p>INSTALLATION OF TUNNEL LININGS A tunnel or shaft lining is installed nondisruptively in a medium such as soil by longitudinally advancing an assembly (10) of tunnel lining sections (12-1 to 12-8) arranged in end-to-end relationship and having an inflatable torus (22-1 to 22-7) interposed between adjacent sections. Worm-like advancement is effected by simultaneously inflating in sequence the tori 22-1, 22-4, 22-7 etc; the tori 22-2, 22-5 etc and the tori 22-3, 22-6 etc, and repeating the inflation procedure as necessary until sufficient advance has been achieved.</p> |
