. Concrete 82 CONCRETE SILOS. r Half round ..^:)toi/e Bo/to For the top section of the wall (last filling of the forms) the inner and outer forms are brought up to the line of the top of the completed wall. The forms are then filled to within one foot of the top, the outer form removed, and brackets attached. (If the stove bolts are already in place the form need not be removed to attach the brackets). The mold box will then be put in place. The cor- nice will be concreted at the same time as the roof, as will be ex- plained later. Roof Framing:—The roof framing may consist of two-by-
. Concrete 82 CONCRETE SILOS. r Half round ..^:)toi/e Bo/to For the top section of the wall (last filling of the forms) the inner and outer forms are brought up to the line of the top of the completed wall. The forms are then filled to within one foot of the top, the outer form removed, and brackets attached. (If the stove bolts are already in place the form need not be removed to attach the brackets). The mold box will then be put in place. The cor- nice will be concreted at the same time as the roof, as will be ex- plained later. Roof Framing:—The roof framing may consist of two-by-fours or similar material, resting on the top of the inner wall form as shown in the sectional view, and the lower left-hand quadrant of the plan view, Figure 68. In case of a silo with a water tank on top, the forms must be removed before the roof framing is put up, and the latter supported on a light framework erected within the tank. The roof frame may be boarded up as shown in the plan view, with boards running- either rad- ially or otherwise, as desired. , „ These boards should be placed ^ X Z Brocket close tog-ether to prevent the concrete from coming through when placed upon them. Table P shows the vertical rise to be given to roofs for silos of various diameters. A hole about 2\ feet square must of course be left for filling the silo, or if a roof covers a tank the hole will afford access to the latter. Before placing the reinforcing or the concrete, the top of the framing should be covered with old newspaper, building paper, or similar ma- terial, which will prevent the concrete from sticking to the forms. This will greatly facil- itate their removal. Placing the Reinforcing:—The lower right hand quadrant of the plan and the sectional view show the spacing of the radial and hoop reinforcing. The former is placed so as to be one Box for Cornice ^^^^ ^P^^^ i'^ J^'^ circum- ference, and the latter so Fig. 67. Mold box for Silo Cornice that the distance between the f
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookpublishernp, bookyear1912
