Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 / The Bergen Hill Tunnels. Paper No. 1154

by F. Lavis

E. CUTTER FOR REMOVING OBSTRUCTIONS IN CONDUITS.

F. ISOMETRIC SKETCH SHOWING METHOD OF BREAKING JOINTS AND POSITION FORKED BONDS.

G. PLAN AND SECTIONS OF EXPANDING MANDREL.

MANDREL DETAILS
[ (Larger view)]

DETAILS OF FINAL RODDING MANDRELS

	Multi-Duct Mandrel	Single-Duct Mandrel
A	3¼”	3⅜”
B	¾”	⅞”
C	2½”	2⅝”