. Canadian engineer. set the concrete was placed and after this had setsufiiciently the lurnbucklis were released and the 60 ft. offorms were drawn ahead by the engine of the excavatingmachine. The brick invert was next laid. Then, 6-in. x6-in. timbers were placed on the brickwork just highenough to allow a 2-m. plank to be placed, to run the archforms on when released, the arch forms being blocked toproper elevation off the 6-in. x 6-in. timbers. When theconcrete had been poured and had set 48 hours the formswere released and drawn ahead as in the invert. Thesesteel forms were certainly a big
. Canadian engineer. set the concrete was placed and after this had setsufiiciently the lurnbucklis were released and the 60 ft. offorms were drawn ahead by the engine of the excavatingmachine. The brick invert was next laid. Then, 6-in. x6-in. timbers were placed on the brickwork just highenough to allow a 2-m. plank to be placed, to run the archforms on when released, the arch forms being blocked toproper elevation off the 6-in. x 6-in. timbers. When theconcrete had been poured and had set 48 hours the formswere released and drawn ahead as in the invert. Thesesteel forms were certainly a big improvement on woodenforms as they could be set up in much less time and gavea much more superior finish, requiring very little, if any,pointing up. The concrete in the first section of sewer completedwas all mixed at Sta. 16 + 35, where a steam plant wasinstalled to heat the material and run the mixer. Theaggregate was placed on a knoll just above the mixer andthe concrete dumped into cars below, which conveyed it. Fig. 6.—Junction Chamber. Viewed from Bellmouth of Section 4, Showing Section 3, Old 6 ft. 6 in. and Old 4 ft. 6 in. Garrison Creek Sewers on the Left and Right Respectively. Fig. 7.—Outlet of Main Garrison Creek Storm Overflow Sewer at the Foot of Strachan Avenue. In the balance of the open cut, 700 lin. ft. of it wasin the ravine where the excavation was very shallow andthe work went on very rapidly. Steel forms were usedin place of the wooden ones and by so doing 240 ft. ofinvert and 180 ft. of arch could be finished in six steel forms were manufactured by the Blaw SteelForm Co. They were made in 5-ft. sections and 12 com-plete sections (60 lin. ft.) were used. Each section wasmade in four pieces, two for arch and two for invert, thearch pieces being bolted together at the centre andseparated by tie rods, which were operated with a turn-buckle, at spring line and half-way between spring lineand centre of arch. The different sections were heldtoget
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