434: 



ESTIMATES OF STRUCTURAL STEEL. 



CHAP. XIII. 



SHOP COSTS OF BINS AND STAND-PIPES. Shop costs for circular and rectangular 

 bins and stand-pipes are given in Table IV, while shop costs for bin and elevated tank bottoms 

 are given in Table V. The shop cost of towers for elevated tanks are given in Table VI. 



TABLE V. 

 SHOP COST OF BOTTOMS FOR CIRCULAR AND RECTANGULAR BINS AND STAND-PIPES. 



TABLE VI. 

 SHOP COST OF TOWERS FOR ELEVATED TANKS AND BINS. 



SHOP COSTS OF INDIVIDUAL PARTS OF BRIDGES. The cost of fabricating joists 

 and other similar members should be estimated on the basis of mill details, which see. 



Eye-Bars. The shop cost of eye-bars varies with the size and length of the bars and the 

 number made alike. The following costs are a fair average: Average shop costs of bars 3 in. and 

 less in width and f in. and less in thickness is from 1.20 to 1.80 cts. per lb., depending upon the 

 length and size. A good order of bars running 2\ in. X f in. to 3 in. X f in., and from 1 6 to 20 

 ft. long, with few variations in size, will cost about 1.20 cts. per lb. Large bars in long lengths 

 ordered in large quantities can be fabricated at from 0.55 to 0.75 cts. per lb. To get the total cost 

 of eye-bars the cost of bar steel must be added to the shop cost. Half card extras given in Table 

 III should ordinarily be added to the base price of plain steel bars. 



Chords, Posts and Towers. In lots of at least four, the shop cost is about as follows: Members 

 made of two channels and a top cover plate with lacing on the bottom side, or two channels laced 

 on both sides cost about i.oo to 0.85 cts. per lb. for pin-connected members weighing from 600 

 to 1,500 lb.; and about 0.80 to 0.70 cts. per lb. for members with riveted end connections. Mem- 

 bers made of four angles laced cost from 0.80 to i.io cts. per lb. for members with riveted ends. 

 Members made of two angles battened will cost about 0.50 cts. per lb. Angles used without end 

 connections should have their cost estimated on the basis of mill details, which see. 



Pins. The cost of chord pins will vary with the size, number and other requirements. The 

 shop cost of chord pins and nuts may be estimated at from 2.00 to 3.00 cts. per lb. Rollers will 

 cost practically the same as pins. Rolled rounds (pin rounds) are used for making pins and 

 rollers. 



Latticed Fence. The shop cost of light simple latticed fence made of two 2 in. X 2 in. 

 angles, with double lacing and about 18 in. deep, will be about 2.00 cts. per lb.; while the shop 

 cost of latticed fence, with ornamental rosettes OB ornamental plates, may be as much as 4.00 to 

 5.00 cts. per lb. 



Floorbeams and Stringers. Plate girders used for floorbeams and stringers will cost from 

 0.60 to 1.25 cts. per lb. depending upon the weight, details and number made at one time. Floor- 

 beams made of rolled I-beams will cost from 0.50 to 0.75 cts. per lb. 



