SHOP COSTS OF STEEL BRIDGES. 435 



SHOP COSTS OF BRIDGES AS A WHOLE. The cost will be taken up under the head 

 of pin-i-nmurtfd bridges, riveted bridges, plate girder bridges, combination bridge metal, and 

 Howe truss metal. 



Shop Costs of Pin-connected Bridges. The shop costs of pin-connected highway or railway 

 bridges, exclusive of fence and joists, are about as follows: 



Bridges weighing 5,000 Ib. and less 1.30 cts. per Ib. 



" " 5,000 to 10,000 Ib 1.20 " " " 



" " 10,000 to 20,000 Ib i.oo " " " 



20,000 to 40,000 Ib 0.90 ' 



44 " 40,000 to 60,000 Ib 0.80 ' 



44 44 60,000 to 100,000 Ib 0.75 " " " 



41 " 100,000 to 150,000 Ib 0.70 " " " 



44 <4 150,000 and up 0.65 " " " 



These costs include detailing and one coat of shop paint. For reaming add 0.15 cts. per Ib. 

 Shop Costs of Riveted Truss Bridges. The shop costs of riveted truss highway or railway 

 bridges, exclusive of fence and joists, are about as follows: 



Bridges weighing 5,000 Ib. and less 1.15 cts. per Ib. 



" 5,000 to 10,000 Ib i.oo " " " 



44 " 10,000 to 20,000 Ib 0.90 " " " 



44 4I 20,000 to 40,000 Ib 0.85 " " " 



44 " 40,000 to 60,000 Ib 0.75 " " " 



44 " 60,000 to 100,000 Ib 0.70 " " " 



44 4< 100,000 to 150,000 Ib 0.65 " " " 



150,000 Ib. and up 0.60" " " 



These costs include detailing and one coat of shop paint. For reaming add 0.15 cts. per Ib. 

 Shop Costs of Plate Girder Bridges. The shop costs of plate girder highway or railway 

 bridges, exclusive of fence and joists, are about as follows: 



Spans weighing 10,000 Ib. and less 0.90 cts. per Ib. 



14 " 10,000 to 20,000 Ib 0.85 " " " 



" " 20,000 to 40,000 Ib 0.75 " " " 



44 " 40,000 to 60,000 Ib 0.70 " " " 



41 " 60,000 to 100,000 Ib 0.60 " " " 



44 100,000 and up 0.50 " " " 



These costs include detailing and one coat of shop paint. For reaming add 0.15 cts. per Ib. 

 Shop Costs of Tubular Piers and Culverts. The shop costs of steel tubular pier shells and 

 steel culvert pipe are about as follows: 



Tubes 18 in. to 24 in. diameter, J in. metal i.oo cts. per Ib. 



44 24 in. to 30 in. diameter, J in. to f in. metal 0.75 to 0.65 " 



44 30 in. to 48 in. diameter, J in. to f in. metal 0.70 to 0.60 " " " 



" 48 in. to 72 in. diameter, J in. to i in. metal 0.65 to 0.50 " " " 



44 72 in. and up f in. to | in. metal 0.50100.45 " " " 



The above shop costs include detailing and one coat of shop paint. The necessary bracing 

 and rods for tubular piers are included. 



Shop Cost of Combination Bridge Metal. Where the bars and rods are standard and the 

 castings are made from standard patterns, the metal for combination bridges can be fabricated 

 at about the same cost per pound as for pin-connected spans weighing the same as the weight of 

 the metal in the combination bridges. 



