34 BULLETIN 53, U. S. DEPARTMENT OF AGRICULTUEE. 



BRIDGE WORK, 1912-13. 



The office constructed bridges at Drake, S. C, and at Cheraw, S. C. Descrip- 

 tions are given below. 



Dkake, S. C.^A 25-foot span I-beam bridge with concrete floor, having a 

 clear roadway 16 feet wide, was constructed at Drake. Work began on July 29, 

 1913, and the bridge was entirely finished by August 23, 1913. It was necessary 

 to provide sluice gates in connection with this bridge, and the construction was 

 on that account made more difficult than it otherwise would have been. 



The abutments and wing walls contained 152.2 cubic yards of concrete, which 

 was mixed in the proportion 1:3:6, while the floor slab and parapets contained 

 12.6 cubic yards of concrete mixed in the proportions 1:2:4. It was necessary 

 to use 175 barrels of cement, 70 cubic yards of sand, 189.6 tons of gravel, nine 

 15-inch 42-pound I beams 28 feet long, 600 square feet of expanded metal, 

 56 linear feet of pipe railing, and 3,744 board feet of lumber. Convict labor 

 and county-owned teams were used. 



The total cost of the bridge, which includes the necessary convict camp 

 expenses, was $1,350.62. The principal items of cost were: Excavation, $18; 

 building forms, $58.50; laying concrete, $68.70; building sluice gates, $10; 

 placing I beams, $5.40; removing forms and back filling, $12.30; 175 barrels of 

 cement, at $1.70 per barrel, $297.50; 189.6 tons of gravel, at $1.45 per ton, 

 $274.92; nine 15-inch 42-pound I beams, at $42.04 per beam, $378.36; 600 

 square feet of expanded metal, at $0,044 per square foot, $26.40; paint for 

 I beams, $3.50; 56 linear feet of pipe railing, at $0.73 per foot, $40.88; 3,744 

 board feet of timber, at $15 per thousand, $56.16 ; hauling gravel, $45 ; hauling 

 sand, $50; and hauling. lumber, $5. 



Cheraw, S. C. — ^At Cheraw, S. C, a concrete bridge, which had been badly 

 damnged, was repaired under the supervision of the office. The repair work 

 began on August 27, 1913, and was finished on September 14, 1913. The total 

 cost of the work was $225.40, and the principal items of cost were: Hauling 

 the materials, $57; building da.ms and pumping water, $27.75; work on the 

 forms, $8; mixing and placing the concrete, $41.25; 924 feet board measure of 

 lumber, at $15 per thousand, $13.86; 102 sacks of cement, at $4.47 per sack, 

 $47.94; and wheelbarrows, drills, bolts, buckets, nails, etc., $29.60. 



PREPARATION OF PLANS. 



Typical designs were prepared during the past fiscal year for concrete bridges 

 and culverts ranging in span from 2 feet to 16 feet and for steel bridges rang- 

 ing in span from 30 feet to 150 feet. About 350 blue-print copies have already 

 been furnished from these plans for use at specific points. Special designs, 

 prepared to cover cases for which the typical designs could not be used, were 

 distributed by States as follows : Arizona, 1 ; Florida, 1 ; Iowa, 3 ; Kentucky, 

 7 ; Maryland, 4 ; Mississippi, 6 ; Nebraska, 2 ; North Dakota, 1 ; South Carolina, 

 2; Virginia, 1; and Wisconsin, 1. 



BRIDGE INSPECTIONS. 



Thirty-five separate inspections were made during the fiscal year 1912-13 

 in connection with which the local officials were given advice as to the most 

 practical types of bridges for the various locations in question and as to the 

 advantages to be derived from employing competent engineering supervision 

 for all bridge work. These inspections were distributed by States as follows: 

 Arizona, 1; Arkansas, 1; Iowa, 10; Kentucky, 9; Maryland, 3; Mississippi, 3; 

 North Carolina, 4 ; South Carolina, 2 ; Virginia, 1 ; and Wisconsin, 1. 



o 



