Author: Theodore Cooper

Publisher:

Published: 2015-06-28

Total Pages: 218

ISBN-13: 9781330470749

Excerpt from General Specifications for Iron and Steel Railroad Bridges and Viaducts 1. All parts of the structures shall be of wrought-iron or steel, except tics and guard rails. Cast-iron or steel may be used in the machinery of movable bridges and in special cases for bed-plates. Generally "double tracks through" bridges will have but two trusses, to avoid spreading the tracks at bridges. In calculating strains the length of span shall be understood to be the distance between centres of end pins lor trusses, and between centres of bearing plates for all beams and girders. 3. The girders shall be spaced, with reference to the axis of the bridge, as required by local circumstances, and directed by the Engineer of the Railroad Company. ( 5.) Longitudinal floor girders shall in 110 case be less than three feet and three inches from centre line of tracks. ( 6.) 4. For all through bridges and overhead structures there shall be a clear head-room of 20 feet above the base of the rails. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."