. Journal of the New England Water Works Association . steam shovel, giving a level path upon which to ereel ?Chief Engineer North Jersey District Water Supply Commission, Newark, N J 458 THE DEEP CORE-WALL OF THE WANAQUE DAM. the frame for guiding the piling and for working the two pile-driving rigs,one on each side of the trench. These rigs had an A-frame 75 ft. high,with an extension to a total height of 92 ft., giving a clearance sufficientU) handle and mesh one 50-ft. pile into another when the latter has beendriven about 10 ft. Rigs were equipped with Warrington No. 1 steamhammers and mo
. Journal of the New England Water Works Association . steam shovel, giving a level path upon which to ereel ?Chief Engineer North Jersey District Water Supply Commission, Newark, N J 458 THE DEEP CORE-WALL OF THE WANAQUE DAM. the frame for guiding the piling and for working the two pile-driving rigs,one on each side of the trench. These rigs had an A-frame 75 ft. high,with an extension to a total height of 92 ft., giving a clearance sufficientU) handle and mesh one 50-ft. pile into another when the latter has beendriven about 10 ft. Rigs were equipped with Warrington No. 1 steamhammers and mounted on skids sliding on sills laid normal to the Methods. In driving the piling the method used wasto put the sheeting down as a wall and not as a series of individual a portable guide frame 48 ft. long made of 12 x 12-in. timbers wasset up over the deepest part of the trench. This frame was constructedso that it could be adjusted to various widths. The aim being to obtain Flo// fine of reser/oir ?t$rr//c&rA. ^ - Future dam ^ ^ iv be but if under ^ ^ another contract ^ ^ Refitt- Originalsurface, EL ??3~jr. mpw*mmELzjz -Stee/ sheefpiiing•Ft/80 _^-B/eeder pipes Section of Dam at Maximum Core-Wall Depth. a trench 20 ft. wide at the bottom, and there being no experience uponwhich to determine the probable deviation of sheeting for such deep driv-ing, the guide frame was first set to a width of 22 ft. After the piling wasdriven, the average top width was found to be actually ft. The devia-tion from the vertical at the rock was found to be about 6 in. for each wallof piling, sometimes wider and sometimes narrower than the width at thetop. On top of the rock the slope of the ledge surface forced the piling outof line so that the narrowest trench was ft. and the widest was on with this experience to govern and for the shallower trench thewidth was reduced to 14 ft. A wall of 50 ft. steel piling was set up on each side of the g
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