Two gangs were employed in assembling forms and a portion of the men in each gang also shaped and placed the reinforcement and placed and tamped the concrete in the forms so that no exact division of labor is possible. The organization of these gangs and the wages paid were as follows:
| Derrick Gang: | |
| 1 foreman, at 36 cts. per hour | $ 3.94 |
| 1 crabman, at 30 cts. per hour | 2.70 |
| 2 topmen, at 27 cts. per hour | 4.86 |
| 2 bottom men, at 23 cts. per hour | 4.14 |
| ——— | |
| Total per 9-hour day | $15.64 |
| Assembling Gang: | |
| 1 boss carpenter, at 47 cts. per hour | $ 4.23 |
| 2 carpenters, at 36 cts. per hour | 6.48 |
| 2 carpenters, at 30 cts. per hour | 5.40 |
| 2 carpenters' helpers, at 25 cts. per hour | 4.50 |
| 4 men forming and placing reinforcing steel | |
| and rethreading bolts, at 23 cts. per hour | 8.28 |
| ——— | |
| Total per 9-hour day | $28.89 |
| ——— | |
| Grand total | $44.53 |
These gangs assembled and erected the molds and concreted 80 columns in 22 working days, including 2 days lost on account of cold weather, so that 4 columns were completed per day of 9 hours. We can subdivide the cost as follows:
| Item. | Per cu. yd. |
| Erecting forms and concreting | $0.81 |
| Assembling forms and reinforcement | 1.56 |
| —— | |
| Total | $2.37 |
Charging the 4 men placing reinforcement and rethreading bolts to forming and placing reinforcement alone we can figure the cost of fabrication and erection of reinforcement very closely. There were 160 lbs. of reinforcing steel in each column, hence $8.28 ÷ (160 × 4) = 1.3 cts., was the cost per pound of forming and placing it. This includes handling.
The stripping of the forms was carried on by another gang using a derrick similar to the first one described, except it could be of lighter construction as it had to handle only the separate parts of each form and not the forms assembled. The derrick shown in Fig. 232 was a 33-ft. A-frame, with wheels at the bottom of each leg. It had a friction crab hoist driven by an electric motor, both of which were fastened to the derrick frame between the shear legs.
Fig. 231.—Derrick for Erecting Wall Column Forms Shown by Fig. 230.
The operation of stripping required only four men and the crabman. The outside flat panel was removed first, and left leaning up against the concrete while the inside trough shaped panel was pried loose and lowered onto the ground with its inside face uppermost. The side panels being comparatively light, were stripped without the use of the derrick, and these panels were assembled on the ground with the inside piece. The derrick then picked up the outside panel again, and placed it in its proper place. After the bolts were put in place, the assembled form was moved on rollers to another point in the line of columns where it was again erected. The arrangement of derricks for erecting and stripping forms is shown in Fig. 233.
The gang stripping forms was made up as follows: