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<br />Pier Design E, as shown in Figure 4,30, con-
<br />sists of 161nch by 16 inch (two eight inch by 16
<br />inch) cotlcrete masonry units with four NO.5 steel
<br />reinforcement bars. Pier Design E is acceptable
<br />for the conditions labeled A, B, C, D, or E as shown
<br />in Table 4.11, based on a minimum CMU strength
<br />of 1500 psi.
<br />Pier Design F, as shown in Figure 4.31, consists
<br />of 16 inch by 16 inch cast-in-place concrete with
<br />four NO.5 steel reinforcement bars. Pier Design
<br />F is acceptable for all conditions shown in Table
<br />4.11, based on a minimum CMU strength of 1500
<br />psi.
<br />
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<br />4"mln.
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<br />2-112r
<br />
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<br />
<br />#5 Dowels
<br />
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<br />1'-6"
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<br />each W8Y
<br />
<br />12'mln.
<br />
<br />Figure 4.31 Pier Design F
<br />
<br />Ground anchors, over and above those required
<br />in state anchoring regulations, must be provided
<br />as shown in Table 4.12. Ground anchor location
<br />should be between two and three feet from the pier
<br />toward the center of the manufactured home and
<br />installed as shown in Figures 4.32 and 4.33.
<br />
<br />Table 4.12
<br />
<br />GROUND ANCHOR SPACINC
<br />
<br /> Height jlboveGrade (ft.)
<br />Wi'"
<br />"'"' 1 , 3 , , , 7 . , 10
<br />I (15 pst)
<br /> 20 Foot on Center
<br />II (25psC) I 10 Foot on Center
<br />
<br />
<br />Figure 4.32 Typical Ground Anchor Detail
<br />
<br />
<br />Figure 4.33 Longitudinal Spacing
<br />of Ground Anchors
<br />
<br />To provide additional stability and resistance to
<br />anticipated loads, all pier designs must have the
<br />bottom of the footing at least 30 inches below
<br />grade or to the frostline, whichever is greater.
<br />The bearing capacity of the soil must be greater
<br />than the maximum vertical load through the piers.
<br />Based on the information in Table 4.10, the max-
<br />imum vertical load is determined and must be
<br />added to the weight of each pier and footing. In
<br />calculating the vertical load, a weight of 150
<br />pounds per foot of pier should be used and 400
<br />pounds for each footing. Hence, a ten foot pier and
<br />footing would weight 1900 pounds. If the bearing
<br />capacity of the soil is exceeded, the footing area
<br />must be increased or additional piers added.
<br />
<br />52
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