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f�cccinhcr 15 1�i92 K _ 927-11R4 <br />Drivi�ig Crileria - Speci(ic driving crileria rcquired lo oblain the allowable pile <br />capacilies can only be eslablished afler Ihe aclual piles, driving equipmenl, anJ <br />allow:.Gle loads are selected. Il is recommended Ihal a wave equ�!ion analysis <br />be coi;ipleled to detennine Ihc requircd driving sel crileria once the pilrs and <br />driving equipmenl are selected by Ihe conlraclor. It is Ihe inlent to provide <br />undamaged piles wilh a minimiun penelration of lhree fcet inlo the bcafli�g , <br />r-- ---- ---- <br />soils bclow lhe (ill and contpressible soils. As an examplc, the final blow munt <br />desired wo�ild bc approximalcly 30 blows/(oot with a liammcr delivcring 15,000 <br />to ?A,000 (ool-pounds of encrgy per blow. It is su�gested that Ihc ram wciglil <br />bc Icss than twice Ihc wcight of Ihc pilc. <br />Dotvn�ir� - ScUlemenl of Ihe pcat and ovcrlying fill tvill lend lo drag lhe pilc <br />down. This force is called dotvndrag. Flowever, as disoissed in Seclion S.G, we <br />mcommend preloading Ihe areas Ihat arc located in decp (ill and peat. 'i'he <br />prelond tvill minimize posl-conslniclion seltlement and eliminale Ihe need to <br />add do�vndra� loads provided Ihc piles arc driven aflcr prcloading. <br />I( ihe pil�s arc inslalled prior lo prcloaJin�, wc reconunrnd addec' � downdrag <br />load of 4 lons/pile to the requircd pile capacity. 'I�hus if the superimposed <br />slruclural load is 2.ri lons, Ihc pilc slwuld bc designed for 29 lons• <br />5.2,4 Ploor Slabs <br />The slabs should Uc suppoNed in Ihc satnc manner as the fow:dalions; i.c. on cilher piles or <br />on Ihe nalive "TilVcompacled fill over nalive lill. It is possible to pile su��porl Ihe slruclure <br />.��iJ "(IoaC' lhe slab on ihe loosc filV��c51. I lowcvcr, ��o not remnunend Iliis approach <br />since it niay restijl iii soiiie cracking belween lhe slab and�lhe foolings and Ihe adJilional cosl <br />o( a ��ile supporled slructural slab (or wuod frame apartmenl buildin�s is typically relalively <br />small. As an allemative lo � structural concretc pilc supporled slab, a r:iised pile su��parlc�l <br />(loor �eilh a crewl s��acc could be uliliuJ. <br />Slabs should bc undcrlain by a capillary brcak mnsisling o( al Icast fuur inches of cican, frcc- <br />draining sand �nd gravel or crushed rock containin�; Iess lhan Ihree percenl (ines (based on <br />Ihe tninus No. 4 Sieve fraclion). A vapor barrier consisling of reinforceJ heavy plaslic <br />shecling shoulJ be induded bchveen Ihe slab and Ihe capillary brcak. To Icssen shrinkaFc <br />cracking o( Ihe Iloor slab concrele, a ltvo-inch layer o( clean building sand should be plamd <br />on lop of Ihe plaslic sherling la accepl curing nwisture I( a cra�vl space is used, adjacent <br />�rades should bc drsigne�l lo drain atva}' from Ihr sliuclurc and lhc crawl space shoidd be <br />co�•emd willi ;ui imperv���iis nwislurc barrier. <br />5.3 I'a��emenls <br />7'hc majorily of ihc proposed E,�ved parking irca is undc�lain by caisling (ill and peal. 'Ihe <br />pavcuicnt design musl address two issucs: sclllemen; and pavemcnl sub�;radc siy>��orl. In <br />a:cas �vhcre Ihe exisling loosc fills and pral arc removed or lhesc soils do nol exist, Ihe <br />pavrments can be designeJ and construrtcd in a norn,al i�ianncr. <br />Goldcr Assoclales <br />