436 ESTIMATES OF STRUCTURAL STEEL. CHAP. XIII. 



Shop Cost of Howe Truss Bridge Metal. The shop cost of highway bridge castings made 

 from standard patterns, is from 1.50 to 2.00 cts. per Ib. The shop costs of the plates, rods and 

 other miscellaneous iron work will be from 2.00 to 2.50 cts. per Ib. 



COST OF ERECTION OF STEEL FRAME OFFICE AND MILL BUILDINGS AND 

 MINE STRUCTURES. In estimating the cost of erection of structural steel work it is best to 

 divide the cost into (a) cost of placing and bolting steel, and (b) cost of riveting. The cost will 

 be based on labor at an average price of $3.20 per day of 8 hours or 40 cts. per hour. 



(a) Cost of Placing and Bolting. The cost of placing and bolting mill buildings for ordinary 

 conditions may be estimated at from $6.00 to $8.00 per ton. The cost of placing and bolting up 

 steel office buildings may be estimated at from $5.00 to $9.00 per ton. The cost of placing and 

 bolting up steel bins may be estimated at from $10.00 to $15.00 per ton. The cost of placing 

 and bolting up head frames may be estimated at from $12.00 to $18.00 per ton. 



(b) Cost of Riveting. It will cost from 6 to 10 cts. per rivet to drive f or f in. rivets by 

 hand in structural framework where a few rivets are found in one place. A fair average is 7 cts. 

 per rivet. The same size rivets can be driven in tank work for from 4 to 7 cts. per rivet, with 

 5 cts. per rivet as a fair average. 



The cost of riveting by hand is distributed about as follows: 



3 men, 2 driving and I bucking up, at $3.50 per day of 8 hours $10.50 



I rivet heater at $3.00 per day of 8 hours 3.00 



Coal, tools, superintendence 1.50 



Total per day $15.00 



On structural work a fair day's work driving f in. or f in. rivets will be from 150 to 250, 

 depending upon the amount of scaffolding required. This makes the total cost from 6 to 10 cts. 

 per rivet. 



On bin work when the rivets are close together and little staging is required the gang above 

 will drive from 200 to 400 rivets per day. This makes the total cost from about 4 to 7 cts. per rivet. 



Rivets can be driven by power riveters for one-half to three-fourths the above, not counting 

 the cost of installation and air. The added cost for power and equipment makes the cost of 

 driving field rivets with pneumatic riveters about the same as the cost of driving field rivets by 

 hand. 



Soft iron rivets f in. and under can be driven cold for about one-half what the same rivets 

 can be driven hot, or even less. 



Cost of Erection. Small steel frame buildings will cost about $10.00 per ton for the erection 

 of the steel framework, if trusses are riveted and all other connections are bolted. The cost of 

 laying corrugated steel is about $0.75 per square when laid on plank sheathing, $1.25 per square 

 when laid directly on the purlins, and $2.00 per square when laid with anti-condensation lining. 

 The erection of corrugated steel siding costs from $0.75 to $1.00 per square. The cost of erecting 

 heavy machine shops, all material riveted and including the cost of painting but not the cost of 

 the paint, is about $8.50 to $9.00 per ton. Small buildings in which all connections are bolted 

 may be erected for from $5.00 to $6.00 per ton. The cost of erecting the structural framework 

 for office buildings will vary from $6.00 to $10.00 per ton. 



Actual Costs of Erection. The cost of erecting the East Helena transformer building, 1897, 

 was $12.80 per ton, including the erection of the corrugated steel and transportation of the men. 

 The cost of erecting the Carbon Tipple was $8.80 per ton, including corrugated steel. The cost 

 of erection of the Basin & Bay State Smelter was $8.20 per ton, including the hoppers and corru- 

 gated steel. 



The cost of erecting the structural steel work for the Great Northern Ry. Grain Elevator, 

 Superior, Wisconsin, was $13.25 per ton including the driving of all rivets. There were 10,600 

 tons of structural steel work, and 2,000,000 field rivets, or nearly 200 field rivets per ton of struc- 

 tural steel. 



