. Bulletin. Agriculture; Agriculture -- Arizona. 94 Bulletin 86 Avenue, built in 1914, and the other the outfall sewer, built in 1917. The same forms were used on both jobs. They are four feet long and the pipe is 30 inches inside diameter with a shell 3^ inches thick. The pipe for the water-supply line was made at a yard, in the center of which was a high derrick. The boom was long and reached over a wide area. Each pipe was moved from the pouring floor out into the yard just before removing the forms and the der- rick was used again later to load the pipe for hauling to place along the trenc
. Bulletin. Agriculture; Agriculture -- Arizona. 94 Bulletin 86 Avenue, built in 1914, and the other the outfall sewer, built in 1917. The same forms were used on both jobs. They are four feet long and the pipe is 30 inches inside diameter with a shell 3^ inches thick. The pipe for the water-supply line was made at a yard, in the center of which was a high derrick. The boom was long and reached over a wide area. Each pipe was moved from the pouring floor out into the yard just before removing the forms and the der- rick was used again later to load the pipe for hauling to place along the trench. The concrete mixture was 1 of cement, 2 of sand, and 4 of broken stone or screened gravel. The reinforcement was of round iron wound spirally and was designed to withstand an inter- nal pressure, varying from zero at the upper end to 30 pounds per square inch at the lower end of the line, with 15,000 pounds per square inch allowable working stress in the steel. For the outfall sewer the pipe was made along the trench and the forms were moved along as the work progressed. This obviated the necessity of hauling the pipe long distances, but required much hauling while making and curing the pipe. The mixture was the same as for the water-supply line, but the reinforcement was uni- form the whole length of the line and consisted of 3^ inch round iron rings spaced 6 inches apart, and 4 rods of the same size running longitudinally through each joint from the end of the tongue to the end of the groove. The maximum dif- ference in elevation in the sewer line is 7?) feet. The only criticism of the pipe just described is that the longitudinal reinforce- ment does not extend con- tinuously across the joints. This continuity can be ob- tained in various ways, and some ingenious joints have been patented, notably the Johnson and the Meri- wether, the former of which is shown in Fig. 15. The Johnson pipe uses special bar reinforcement, and the Meriwether uses "Triangle ; Ord
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Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectagriculture
