Public works . mber one 24 x 24-inch and eleven6 X gates were specifications providedthat all gates be securelyblocked and fastened in posi-tion before concreting. Thegates will be operated by stemsvarying in length from 50 feetto 75 feet and were requiredto be set exactly plumb, butas each gate weighs 4,700 lbs.,it was practically impossible,with the means available, tosustain them in place whileconcreting around them. Inconstruction, therefore, thebolts for the gate frames wereset as the concrete was depos-ited and the gates and gateframes were set after concret-ing of th
Public works . mber one 24 x 24-inch and eleven6 X gates were specifications providedthat all gates be securelyblocked and fastened in posi-tion before concreting. Thegates will be operated by stemsvarying in length from 50 feetto 75 feet and were requiredto be set exactly plumb, butas each gate weighs 4,700 lbs.,it was practically impossible,with the means available, tosustain them in place whileconcreting around them. Inconstruction, therefore, thebolts for the gate frames wereset as the concrete was depos-ited and the gates and gateframes were set after concret-ing of the gate chamber hadbeen completed. The rock stratification onthe east hillside is so much in-clined from the horizontal thatit was impossible to expose alarge face without causing arock slide. It was possible,however, by stepping the foun-dation, to keep a rugged wallof rock against which to placeconcrete. About 2,000 yardsof solid rock was estimated,but owing to the sliding ten- 462 PUBLIC WORKS Vol. 52, No. 25. FIG. 3. ROCK SLIDE AT FURTHER END OF DAM. dency, over 5,000 yards was excavated. Excavationfor the east abutment was started before completionof the construction plant, yet, due to the difficultiesencountered, this portion of the dam was the lastcompleted. CONTRACTORS PLANT In order to convey concrete from the mixers onthe west side of the river to the easterly part of theeast abutment, the concrete was rehandled at the easttower. An elevator bucket within the tower was filledfrom the line chute, then elevated, and the contentsemptied into a second chute higher on the east tower = 168 feet high and the west tower204 feet high. The towers are 340 feet apart andconnected by a l^^-inch cable which carries theconcreting chute. The capacity of the plant is about 600 cubic yardsof concrete per 10-hour day, although at times 700cubic yards have been placed in that time. The aver-age per working day was 300 cubic yards. A con-siderable portion of the contractors plant
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
