254 



BRIDGE ABUTMENTS AND PIERS. 



CHAP. VI, 



EXAMPLES OF RAILWAY BRIDGE ABUTMENTS. Standard stone masonry abut- 

 ments designed by the Baltimore & Ohio Railway are shown in Fig. 3. These abutments are 

 to be used for deck and through girder spans. The plans are worked out in detail and give data 

 for different conditions. 



Standard designs for a straight abutment and for a wing abutment designed by the N. Y. C. 

 & H. R. R. R, are shown in Fig. 4. Data for different conditions are given on the plans. The 

 quantity of masonry and of old railroad rails required for the N. Y. C. & H. R. R. R. abutments 

 shown in Fig. 4 are given in Fig. 5. The wings are the length required for a flare of 30 degrees and 

 a side slope of roadway of 15 to I. 



d 



14 



'18 



v 



& 



30 



JOO 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Cubic Yards of Masonry 



NOTE '-H equals distance from top of 



foundgtion to Base of Pail. 

 Quantities shown by curves are /VET. 

 Foundation based on depth of 4 feet, 



FIG. 5. QUANTITIES IN MASONRY ABUTMENTS, N. Y. C. & H. R. R. R. 



The quantity of concrete in single track railway bridge abutments as designed by the Illinois 

 Central R. R. are given in Fig. 6. The quantities in double track abutments may be calculated 

 as shown in Fig. 6. 



Cooper's Standard Abutments The abutment in (a), Fig. 7, is from Cooper's "General 

 Specifications for Foundations and Substructures of Highway and Electric Railway Bridges." 

 The length, /, and the thickness, a, for highway and single track electric railway bridges are as 



