Railroad Structure And Estimates

Cover Railroad Structure And Estimates

PREFACE THE SECOND EDITION. THE chapters of this book have been rearranged to conform, as near as may be, with the classification of accounts as prescribed by the Interstate Commerce Commission, issue of 1914 there has also been added a large amount of new material and wherever possible the unit cost or an estimate is given for all items of track work, track structures and buildings. A feature has also been made of quantities for track material, that to a very t large-extent is not dealt with in

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other textbooks. It has often been said that cost figures are not of much value unless accompanied by exhaustive detail. This probably is correct from a contractors standpoint, but it-is also true that even with detailed figures any two jobs, built exactly alike and under the same conditions, will vary more in the details item for item than in the totals and it is with the latter figures especially that the engineer is mostly concerned, as in the multiplicity of work usually dealt with there is seldom time to analyze details until the work is authorized. For this reason the quantities and cost data have been arranged for handy reference, ereby a quick total estimate can be made that may serve as a guide when more authentic information is lacking and in this connection it should be remembered that in the final analysis the figures depend not from what can be had from a book but rather on the judgment and experience of the estimator and his knowledge of the labor and material market in the vicinity in which the proposed work is to be executed. Acknowledgment is here made to the various technical mag azines, Engineering News, Railway Age Gazette, Ilfaintenance. of Way Engineer, Railway World, Engineering and Contracting, and. many others for material incorporated either in whole or in part under the various subjects dealt with also to many members of the engineering staff of the various railways for valuable information received and courtesies extended. J. W. ORROCK. New York, November, 1917. v TABLE OF CONTENTS. PART ONE. TRACK AND TRACK STRUCTURES. CHAPTER I. TRACK MATERIAL AND ESTIMATES. P A Q Rail properties Rail feet into tons Rail tons into track miles Rail joints and bolts Elements of various joints Track work and material Cost above subgrade Tumouts - quantities and cost Crossovers-quantities md cost Track material for quick estimating Rail and fastenings per mile Rail renewals Switch ties for turnouts Switch ties for crossovers. ............................... 4-23 CHAPTER 11. STRUCTURAL MATE IAC AND ESTIMATES. Weighta of bridge spans Weights of steel trestles Wooden trestles . Subways Highway bridges Gravity retaining walls Concrete culverts Buildings and miscellaneous. ....................... 24-39 CHAPTER 111. COST OF RAILROADS. Unit prices Clearing and grubbing Cost of train service Equipment and rent. ................................................. 40-51 CHAPTER IV. GUDE SEPARATION. Benefits and objections Fill or excavation Costs Street grades Clearances Equipment cost and rental rates.. .................. 52-61 CHAPTER V. TUNNELS AND SUBWAYS. Tunnel sections Driving Design Cost Drainage Floors Subways - Types Weight of steel Reinforced con - c rete Estimates 62-82 vii CONTENTS CHAPTER VI...

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