Fig. 223.—Section of Rectangular Wall Column.
Two men, with sledge and drill, cut out the brick work amounting to about 12 cu. yds. for each column in 15 hours, at a cost of about 70 cts. per cu. yd., including removal to the street. The cost of moving and re-erecting the scaffolding was $2.94 per each move. The character of the reinforcement is shown by Fig. 223; it was erected as the concreting progressed, the main bars being in sections 15 ft. long, spliced with and distanced by side bars and cross bolts at the splices.
Fig. 224.—Staging and Forms Used in Building Column Shown by Fig. 223.
The concrete was hand mixed in 6-cu. ft. batches at the foot of the column, by three men with a fourth turning over and filling the buckets. The buckets, 12 ins. in diameter and 16 ins. high, were hoisted by a pulley line arranged as shown and pulled by a mule driven by a man, at $1 per day for the mule and $1.50 for the man, the cost of hoisting being 25 to 40 cts. per cu. yd., depending on the rapidity of the man inside the form. This man tamped the concrete which was emptied from the buckets by a man on the scaffolding. Each batch raised the level in the form 15 ins., and between batches a set of ties for the column rods was placed by the man during the tamping. It took from 1½ to 2 days to concrete a column of 12 cu. yds. The concrete was a 1-3.8-5.7 limestone screenings mixture, mixed wet enough to be easily pushed into the forms and worked around the reinforcement. The form construction is shown by Fig. 224. The form for one column required 650 ft. B. M. of lumber, and on an average, each form was used twice. As a matter of fact, the side strips and outside braces were used three times, while much of the ⅞-in. sheathing was destroyed by being used once. The lumber for shoring cost $23 per M. ft. B. M., and the light lumber for forms cost $18 per M. ft. B. M. All lumber was yellow pine. All labor was negro, at 15 cts. per hour; foremen who worked. 22½ cts. per hour. The cost of the several parts of the work compiled from records furnished by Mr. Keith O. Guthrie, engineer in charge, was as follows:
| Concrete. | Cost per column | Cost per cu. yd. |
| Lumber for forms | $ 4.81 | $0.40 |
| Setting up and removing forms | 11.32 | 0.95 |
| Cement, 10.17 bbls. at $2.40 | 24.40 | 2.03 |
| Sand, 5.87 yds. at $0.90 | 5.28 | 0.44 |
| Stone, 8.75 yds. at $1.35 | 10.94 | 0.91 |
| Mixing and wheeling | 15.73 | 1.31 |
| Hoisting by mule with driver | 4.80 | 0.40 |
| Handling bucket on scaffold | 2.93 | 0.25 |
| Tamping inside column | 2.93 | 0.25 |
| Painting with grout | 3.89 | 0.32 |
| Clearing away rubbish | 1.97 | 0.16 |
| Rigging, etc. | 2.64 | 0.21 |
| Tools | 0.59 | 0.05 |
| Moving scaffold | 2.94 | 0.25 |
| Moving mix board and rigging hoist | 1.62 | 0.14 |
| ——— | —— | |
| Total cost of concrete | $96.79 | $8.07 |
| Reinforcement. | Cost per column. | Cost cts. per lb. of bars. |
| Iron bars, 1,034 lbs. | $20.68 | $2.00 |
| Drilling iron bars | 1.44 | 0.14 |
| Setting iron bars in place | 1.23 | 0.12 |
| Bolts for splicing and spacing | 3.98 | 0.40 |
| Wire cross ties at 2-½, cts. lb. | 1.39 | 0.14 |
| Labor forming 130 cross ties | 1.13 | 0.11 |
| ——— | —— | |
| Total cost of iron and steel | $29.85 | $2.91 |
| Summary of Cost. | ||
| Per column. | Per cu. yd. | |
| Concrete in place | $96.79 | $8.07 |
| Steel in place | 29.85 | 2.49 |
| Cutting out and removing brick | 8.36 | 0.70 |
| Shoring floors and roof, labor | 5.87 | 0.49 |
| Ditto for lumber used 3 times | 3.44 | 0.29 |
| ——— | ——— | |
| Total | $144.31 | $12.04 |