TABLE XVIII.—ITEMIZED COST OF CONCRETING NORTH CAISSON FOR BROOKLYN TOWER OF THE WILLIAMSBURG BRIDGE:
| COST OF CONCRETING CAISSON ABOVE ROOF (5,692 cu. yds.) | ||||
| Materials. | Quantity. | Rate. | Amount. | |
| Cement | 6,707½ | bbls. | $1.57 | $10,531.00 |
| Sand | 2,133 | cu. yds. | .40 | 845.00 |
| Broken stone | 4,938 | cu. yds. | 1.10 | 5,432.00 |
| Water | 51.00 | |||
| —————— | ——— | ———— | ||
| Total | 5,692 | cu. yds. | $2.96 | $16,859.00 |
| Labor. | ||||
| Mixing and placing | 5,692 | cu. yds. | $0.73 | $4,159.00 |
| Plant charges | 2,952.00 | |||
| Plant labor | 517.00 | |||
| —————— | ——— | ———— | ||
| Total | 5,692 | cu. yds. | $0.61 | $3,469.00 |
| Total cost | 5,692 | cu. yds. | $4.30 | $24,487.00 |
| General expenses, 10% | 5,692 | cu. yds. | .43 | 2,448.00 |
| Grand total | 5,692 | cu. yds. | $4.73 | $26,935.00 |
| COST OF CONCRETING SHAFTS. | ||||
| Materials. | Quantity. | Rate. | Amount. | |
| Cement | 614½ | bbls. | $1.57 | $965.00 |
| Sand | 204 | cu. yds. | .40 | 82.00 |
| Stone | 521 | cu. yds. | 1.10 | 574.00 |
| —————— | ——— | ———— | ||
| Total | 576 | cu. yds. | $2.82 | $1,621.00 |
| Labor. | ||||
| Mixing and placing | 576 | cu. yds. | 1.70 | 982.00 |
| Plant charges, etc. | 576 | cu. yds. | 1.36 | 795.00 |
| —————— | ——— | ———— | ||
| Total | 576 | cu. yds. | $5.88 | $3,398.00 |
| General expenses, 10% | 576 | cu. yds. | .59 | 339.00 |
| —————— | ——— | ———— | ||
| Grand total | 576 | cu. yds. | $6.47 | $3,737.00 |
| COST OF CONCRETING WORKING CHAMBERS (1,566 cu. yds.). | ||||
| Materials. | Quantity. | Rate. | Amount. | |
| Cement for concrete | 1,559 | bbls. | $1.51 | $2,446.00 |
| Cement for mortar | 442 | bbls. | 1.51 | $694.00 |
| Sand for both | 630 | cu. yds. | .40 | 252.00 |
| Broken stone | 1,380 | cu. yds. | 1.10 | 1,518.00 |
| —————— | ——— | ———— | ||
| Total | 1.566 | cu. yds. | $3.14 | $4,910.00 |
| Labor. | ||||
| Top labor, mixing and placing | 1,566 | cu. yds. | $0.78 | $1,198.00 |
| Pneumatic labor | 1,566 | cu. yds. | 4.91 | 7,694.00 |
| Compressor house labor | 1,566 | cu. yds. | .11 | 180.00 |
| —————— | ——— | ———— | ||
| Total labor | 1,566 | cu. yds. | $5.80 | $9,072.00 |
| Plant. | ||||
| Coal at $2.40 per ton | 1,566 | cu. yds. | .06 | 87.00 |
| Concrete plant | 1,566 | cu. yds. | .86 | 1,352.00 |
| Pneumatic plant | 1,566 | cu. yds. | .81 | 1,272.00 |
| —————— | ——— | ———— | ||
| Total plant | 1,566 | cu. yds. | $1.73 | $2,711.00 |
| —————— | ——— | ———— | ||
| Totals | 1,566 | cu. yds. | $10.67 | $16,693.00 |
| —————— | ——— | ———— | ||
| General expenses, 10% | 1,566 | cu. yds. | 1.06 | 1,669.00 |
| —————— | ——— | ———— | ||
| Grand total | 1,566 | cu. yds. | $11.73 | $18,362.00 |
COST OF FILLING PIER CYLINDERS.—The following costs were obtained in mixing and placing concrete in steel cylinder piers. The sand and gravel were wheeled 100 ft. to the mixing board at the foot of the cylinder, mixed and shoveled into wooden skips, hoisted 20 ft. by horsepower and dumped into the cylinder. The foreman worked on the mixing board and the men worked with great energy. The costs were as follows:
| Item— | Per day. | Per cu. yd. |
| 6 men wheeling materials and mixing at 15 cts. per hour | 9.00 | $0.45 |
| 2 men dumping skips and ramming at 15 cts. per hour | 3.00 | 0.15 |
| 1 team and driver at 40 cts. per hour | 4.00 | 0.20 |
| 1 foreman at 30 cts. per hour | 3.00 | 0.15 |
| —— | —— | |
| Totals | $19.00 | $0.95 |
PIERS, CALF KILLER RIVER BRIDGE.—The following methods and costs of building two new piers and extending three old piers with concrete are given by Mr. J. Guy Huff. The work was done by the railway company's masonry gangs. Figure 94 shows the arrangement of the several piers and the character of the work on each and Fig. 95 gives the detail dimensions of the three main piers.
The sand and aggregate, consisting of blast furnace slag, were unloaded from cars to platforms on a level with the top of rail, placed about 100 ft. south from the south end of the bridge. A cubical 1/6 cu. yd. mixer was used. This was operated by a gasoline engine, and was located on a platform about 50 ft. south of the south end pier. A tank near the mixer to supply water was elevated enough to get the desired head, and was kept filled by a pump run by another gasoline engine located down by the river bank. The cement house was located between the mixer platform and slag pile.
Fig. 94.—Diagram Arrangement of Piers, Calf Killer River Bridge.
