. Handbook of construction plant, its cost and efficiency. otal rental to Jan. 1 $1, $1, $1, $1, $6, Total yds. mixed. 12,350 15,500 10,500 19,000 57,350 Plant cost per yd. $ $ $ $ $ III.—COMPARISON OF OWNED AND RENTED PLANTS. Mixer No. 2 3 4 6 Totals Plant cost per yd., Table 1 $ $ $ $ $ Table°S2.^er.^.. cent saving byowning plant, based on rental „ , „ .-„„ cost MIXERS 421 The cost of unloading and placing in condition for workaverages abou
. Handbook of construction plant, its cost and efficiency. otal rental to Jan. 1 $1, $1, $1, $1, $6, Total yds. mixed. 12,350 15,500 10,500 19,000 57,350 Plant cost per yd. $ $ $ $ $ III.—COMPARISON OF OWNED AND RENTED PLANTS. Mixer No. 2 3 4 6 Totals Plant cost per yd., Table 1 $ $ $ $ $ Table°S2.^er.^.. cent saving byowning plant, based on rental „ , „ .-„„ cost MIXERS 421 The cost of unloading and placing in condition for workaverages about $65 to $75 per mixer. Gravity Mixers. The most common form of gravity mixersconsists of two or four small hoppers (depending upon the sizeof the mixer) set upon a frame support, which latter also carriesa platform on which the men are stationed to load the materialsinto the hoppers. Below these top hoppers three large hoppersare set, one below another. To operate the mixer after thetop hoppers have been charged the gates of these are opened,. Fig. 179. Showing an Arrangement of the Hains Concrete Mixer, and material allowed to pass into the hopper below, where it iscaught and held until this hopper is full, upon which the gatesare opened and the material allowed to flow into the nextlower hopper and so on until the concrete is received in thebottom hopper ready to be taken to the forms. This is properlya batch mixer, but the charging is carried on while the materialis being mixed in the lower hoppers. Only the metallic parts of this mixer, that is, the hoppers,chutes, gates, etc., and not the wooden framework, are furnishedby the manufacturer. 422 HANDBOOK OF CONSTRUCTION PLANT Stationary Gravity Concrete Mixer. (Figs. 179, 180) Smallsize, capacity %, cu. yd. per batch, weight of metallic parts2,840 lbs. Price, f. o. b. nearest station, $1,250. Medium size, capacity 1% cu. yd. per batch, weight of metallicparts 7,060 lbs. Price $1,400. This type of mixer is also ma
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
