. Concrete 36 conc:rete silos Foundations Laying Out the Work:—The site of the silo having been selected and its size determined, the excavation should be laid out. This may be done conveniently with a sweep similar to the one shown in Figure 24. A heavy stake is driven in the center of the spot selected for the silo and allowed to project above the surface about one foot. The arm of the sweep may be made of a two-by-four at least two feet longer than one-half the inside diameter of the silo. The arm swings about the stake as a center, being held to the latter by a large spike. A chis
. Concrete 36 conc:rete silos Foundations Laying Out the Work:—The site of the silo having been selected and its size determined, the excavation should be laid out. This may be done conveniently with a sweep similar to the one shown in Figure 24. A heavy stake is driven in the center of the spot selected for the silo and allowed to project above the surface about one foot. The arm of the sweep may be made of a two-by-four at least two feet longer than one-half the inside diameter of the silo. The arm swings about the stake as a center, being held to the latter by a large spike. A chisel-shaped board or template is placed as shown on the arm of the sweep, so that when the latter is swung around the stake, the l)oard will describe a circle with a diameter lYz feet greater than the inside diameter of the completed silo. This will give the outer line ol the excavation and also Figure 24. Simple sweep, convenient in laying out excavation. Excavating:—The cxcavatinn sliotild be carried to a depth not to exceed (> feet behiw tlic lldur of llic barn where tlie silage is to be fed. The objection to going deeper is tliat il adds to the labor in remov- ing the silage. In all cases. ho\\e\er, the foundation should be estab- lished below frost. All of the earth within the line described by the sweep should be removed down to a point one foot from the bottom, and below this the excavation should be made the shape and size of the foundation, 2 feet wide by 1 foot in depth, so ])laced that the outer edge will come directly up to the ctiV^o: of the excavation, assuming that the sides of the latter are perpendicular. If the silo is to be equipjied with a concrete chute, the founda- tion for the chute should be put in at the same time as that for the silo. As the chute is rectangular in sha])e, no difficultv should be encountered in excavating for the foundation, which will be at the same depth as the silo foundation, and two feet in width b
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookpublishernp, bookyear1912
