. Journal of the New England Water Works Association . driven inside of the original set. This was the onlyplace where a double set was required. Method of Concreting Core-Wall. As soon as the earth was excavatedfrom the northerly end of the trench, the concreting of the core-wall wasbegun. Aggregate was obtained from m gravel bank on the opposite sideof the river located on a terrace about :>.> ft. above river level about one- 464 THE DEEP CORE-WALL OF THE WANAQUE DAM. half mile away from the core-wall. The material was excavated bymeans of a steam shovel, hauled to and run through a cr
. Journal of the New England Water Works Association . driven inside of the original set. This was the onlyplace where a double set was required. Method of Concreting Core-Wall. As soon as the earth was excavatedfrom the northerly end of the trench, the concreting of the core-wall wasbegun. Aggregate was obtained from m gravel bank on the opposite sideof the river located on a terrace about :>.> ft. above river level about one- 464 THE DEEP CORE-WALL OF THE WANAQUE DAM. half mile away from the core-wall. The material was excavated bymeans of a steam shovel, hauled to and run through a crusher and a revolv-ing screen. The portion of the output of the screening plant which couldbe used at once was hauled directly to the concrete mixer and the remain-der stored in the excavated part of the pit for future use. There was about50 per cent, of excess sand in the pit which had to be wasted. The con-crete mixing plant located 300 ft, from the core-wall trench consisted ofaggregate storage piles feeding into bins by a derrick and two Ransome,. Bottom of Deep Core-Wall Contact Between Steel Sheet Piling and Rock. size 53, mixers. Mixed concrete mostly proportioned 1: 2\: 5 was depositedin bottom-dump buckets hauled to the core-wall trench on narrow-gageflat cars and transferred by stiff-leg derricks to the concrete forms. Inthe bottom of the trench, on account of the interference of timbering,concrete was placed through hoppers feeding into a vertical 10-in. steelpipe. In the first part of the work the water in the bottom was handledwith no difficulty by means of blind drains or pipes on the sides of thetrench next to the sheeting, but as the deeper portion of the trench wasreached the quantity of water increased and begun to interfere with plac-ing the concrete. The ground water back of the sheeting began to leakthrough and flow onto the concrete up to a level some 20 ft. above thebottom of the trench. To obviate this trouble holes were burned in the sheeting
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