Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 872
piston. Air feed pipes enterthrough the side of the cylindrical ring and also Into theredufing elbow at tin- bottom of the mixer. The aggre-gates and cement are fed into the mixer from a measur-ing hopper set above it. water is turned on, and the doorclosed. The air valve is then opened, and the… … uicved ahead beneath the other forms and then raised intoplace. The jumbo is constructed so as to allow passageof muck cars beneath it and thus forms can be movedahead and set up without interfering with the concretingof adjacent section or the excavation of the tunnel. The inside footing forms are…
Architecture · Building · Construction industry · Engineering
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