Books Group Surveyor Volume 18

ISBN 13: 9781235914959

Surveyor Volume 18

9781235914959: Surveyor Volume 18
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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. 1900 Excerpt: ...detailed cost per yard of single track, on the two systems, based on the price of materials delivered at Bradford, is as follows:--Although it will be seen from the foregoing tables that the first cost of the Demerbe track is cheaper than the girder track, this point is not the most important. There iB the cost of maintenance to consider, and, judging from the condition of the Demerbe track in Leeds-road after six yeara' wear and tear, it does not appear that any repairs will ever be necessary during the life of the rail, onoe it is properly laid. This life I should estimate to be about twenty years, while the girder rail has to be renewed in sixteen years. The opponents of the Demerbe system, when they compare theBe rails with the girder type, state that the latter rail, when laid on two supports, will carry a heavier load than the Demerbe rail under the same conditions. This is quite trne, but the Demerbe rail does not act, nor is it intended to act, as a girder. It is supported by a ridge of conorete, and the rail merely aots as a metallic covering. ADVANTAGES OF THE DEMERBE SYSTEM. The advantages of the Demerbe system of tramways over other systems may be summarised as follows: (1) The system is simple, being composed of very few parts. It is also oheaper, and can be laid more quickly than the girder system. (2) The rail and concrete resist the heaviest loads without displacement, depression or other alteration of the track. (3) The cost of maintenance of rails and paving is reduced to a minimum. (4) The tie-bars are constructed without rivets or nuts. No punching or drilling of the rails is therefore necessary, as the tie-bars can be fixed to any part of the rail by means of the slots. (5) Curves of quick radii are made at the works, and are laid as qu...

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