A guide and its anchor for placing poured concrete, particularly for lining a tunnel

摘要

1,042,781. Anchoring bolts; nuts; cotters. C. I. WILLIAMS. Nov. 8, 1963 [April 15, 1963], No. 44121/63. Heading F2H. [Also in Division E1S] A nut on an anchor rod 30 which secures a shuttering for a tunnel floor (see Division E1) is an elongated cone having an hexagonal recess for a spanner. A cap 42 over the end of the nut prevents ingress of concrete. A cotter 24 secures a rail 16 in position.