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<br /> <br />dation, Two ways to anchor posts are to embed <br />them in concrete or to fasten them to metal straps, <br />angles, plates, etc" that are themselves anchored <br />in concrete footings, piers, or pile caps. <br />Figure 3,17 shows one method of anchoring <br />wood posts in concrete, Spikes or lag bolts 5/8 to <br />3/4 inch in diamenter are driven into the post <br />around its base. The post is placed into the hole, <br />secured to bracing restraints to prevent movement <br />and the concrete is poured, <br /> <br />Slllt:esor <br />LIlgScrew8 <br /> <br />Figure 3.17 Post Anchoring <br /> <br />Above-grade wood posts supported by concrete <br />piers may also be considered as shown in Figure <br />3,18, In this case, the entire length of the post is <br />accessible for maintenance; however, the connec- <br />tion between post and pier must be designed to <br />resist all applied loads, <br /> <br />Anchor-Strap <br /> <br />, , <br />: : Hooklld5?od <br />..~".~P'''''F'otl'' <br />" .....~. : <br />.~..... i -'" :>' :.....-..... <br />r;:>:~: ~\ ~k~:'~.'?~~:"! <br /> <br />'<, < .",~(:~:> '. ./ /' <br /> <br />"""" ' ,(. // '" '''''~".'',,",' <br />...... ./. <br />....;..... <br /> <br />Figure 3.18 Post Anchoring <br /> <br />A calculational procedure, design guidelines, <br />and examples for determining the adequacy of a <br />particular post system design for elevating <br />manufactured homes under differing loads is <br />presented in Chapter IV, <br />Piles-Piles, as shown in Figure..3,19, are ver- <br />tical supports made of wood, steel, or reinforced <br />concrete which can be driven into the ground to <br />support a manufactured home, The use of properly <br />driven and embedded piles is an elevation tech- <br />nique that is appropriate in flood-prone areas sub- <br />ject to high water velocity and depth and having <br />poorly drained soils with low bearing capacity, <br />such as coastal areas, <br /> <br />Figure 3.19 Piles <br /> <br />Round timber piles, which are frequently used, <br />are generally available in longer lengths than <br />square timbers; and for lengths greater than 25 <br />feet, round piles are frequently the only piles <br />available, A minimum tip diameter of eight inches <br />and a butt or top diameter (at the floor beam level) <br />of 11 inches or more are recommended for round <br />piles, <br />There are several methods available for embed- <br />ding piles, Pile driving is an excellent method due <br />to the strength of the pile and earth interface to <br />resist vertical and horizontal loads, An alternative, <br />the drop hammer, consists of a heavy weight that <br />is raised by a cable attached to a power-driven <br />winch. The weight is then dropped five to 15 feet <br /> <br />25 <br />