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' ' January 22,2003 <br />. IINA Projcct No. 2002-IRS <br />� <br />l <br />� <br />� <br />� <br />� <br />� <br />� <br />� <br />1� <br />� <br />A <br />� <br />' . <br />fomicd. A singlc largc rcinlorcin�� rod, or a rcinlurcim, r,i�,c, r;m bc installcJ li,r lhc tull <br />pile Icngth throuSh thc hollow-stem of thc augcr. <br />At the minimum spacing of lhrec pile diumcicrs apart (centcr-lo-ccnicr), the concrctc <br />grout should be allowed to cure a suflicicnt lenglh of timc su th�it it ���ould he sclf- <br />suppoiting prior to inslalling adjaccnt pilcs. No rcducli�in in �ril:cal pilc cap,�cit}� tor <br />group actior, is necessary. <br />The quality of auger-cast concrele piles is prinuuily drpendrnt on thc procrdures and <br />workmanship of thc Contraclor who installs thcm. A properly tunclioning pressure gagc <br />and tlow mctcr or pump strokc counlcr shoulJ bc prucidrd un thc �rout pum�� m assist iu <br />monitoring auger-casl pilc installation. "fhe counler is uscd t�, dclenninc thc approsimate <br />volume o('groul pumped by cuunting thc numbcr ufslrukcs ufa displaccroc�il�typc pump. <br />The pump shuuld, lhcreli�rc, be calibraUcd prior to ils usc. Altcrnativcly, a f1o«�'metcr <br />could be provided to directly mcasure the volume ol'gruul pwnped into cach pile. 'i'he' <br />pressure gage is uscd lo monitor the pressure of the gruut to cvaivatc tlie ralc at ���hich the <br />auger should be retracled, and if the augcr or hoses arc plugged. The auger should be <br />wilhdrawn with slow pusitive rotation al a slow stcady pull and shuuld not he pulled until <br />the grout has bcen pumped�a Icw fcet abovc fhe tip. <br />The installation of auger-cast concrctc piles, including mcasurcmcnt uf thc �•olutne of <br />grout pumped into each pile, should be monilorcd on a liill limc basis. <br />��ook Surroer <br />�Ue recommcnd tlmt tluor slabs also bc structurally suEiportcd, with gr.�dc bcams bcaring <br />on augcrcast pilcs. Thc gradc br.mis shoulJ bc licd to lhc pilcs supporting thc building <br />sln�cturc. In ordcr to rcducc forming costs, wc anticipalc lhal lhe slrucwral slab ��•ould bc <br />cast of grada Al�crnativcly, fimning mi�hl bc utilizcd anJ a cra�vl spacc pro� ided undcr <br />tlie slab if it would scn�c somc utility lu thc structurc. <br />If thc structural slab is c,�sl in conlacl with thc cxistin�� subgradc suils, ���c rccummcnd <br />that it should bc built on a minimum 4-incli.thick pca ��rcn�cl I:i��cr. �vith a platitic � apor <br />b.uricr on �up of thc pca �ravcl, in ordcr tu prcvcm potculi;d tilab ��•ctting li�om nwislurc <br />infilUation and capillary cf7ccts. Additionally, cxlcrior crading pru� isiuns shuidd bc <br />included lo prcvcnt polcntial runoff���alcr Gom ponJim� and/ur in�iltraling intu lhc <br />�ranular la��crs bcneath thc slab. <br />\�IODUL,Vt OFFICE I3UILDINC SUppOIt'I' <br />The modular oflice building could be supportcd on shalla��� picrs un sprcad fi�o�inLs. <br />Based on the density ofthc ncar-surfacc sand lill, as inlcn�cd tiom aur borines. ��c <br />considcr that an allo�vablc bcming pressurc of I500 psf is appruprialc firr thc dcsign of <br />70112-IS9 Suppl Lltduc <br />II\VA GcoScicnces Inc. <br />� <br />