The Cornell Civil Engineer Volume 17 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...to the difficulty. The work was done in the summer of 1906. The concrete plant was arranged very economically and satisfactorily as there was considerable concrete to place at this point in addition to the wasteway, there being another tunnel portal, over two hundred feet of canal lining and nearly four hundred feet of tunnel lining. No attempt was made to save in the preliminary expense in locating and erecting the concrete plant. A one-half-yard Smith mixer was installed on a bench about 25 ft. above the grade of the canal and about 20 ft. back from the slope, at a point about opposite the wasteway culvert. Sand and gravel were obtained on top of a hill back of the mixer. A one-foot layer of earth was first stripped off the pit by teams and scrapers. The sand and gravel was then shoveled by hand into wheelbarrows and carried about 40 ft. to a trestle where it was dumped into screens, from which the separated and graded materials were carried by gravity through spouts to bins back of the mixer. A car holding a two-sack batch of concrete was used to deliver sand and gravel from the bins to the mixer, the length of haul being about 15 ft. The concrete was dumped from the mixer into a car which in turn dumped into a chute about 20 ft. away. The chute emptied into a bin from which the concrete was taken in ' Sterling ' carts having a capacity of 7 cu. ft. and wheelbarrows, the maximum length of haul being 120 ft. A runway was built above the forms and the concrete was deposited in the forms through jointed spouts. The joints were about 30" in length with a diameter of 6" at the top and 5" at the bottom. Two eyelets were riveted at both top and bottom and joints were wired together. Water was obtained from the river, about 200 ft. from the mixer, ...