design of machinery foundations

7/28/2019 Design of Machinery Foundations

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1.1 .'\11 rnnchincry rounr!aUolI!l shollld be cksigncd 10 provicle the strcngth,rnass Hml 1"J.!ir.lity 1l(ccSfl:;lr.v to suppo!'t the statie loads imposed bythe rnachhe. This is ac(.!omptishccl by appJying the S3.me principIesof d ( ' ~ l n ("\s fOl' building founc1a!ions. TIowc>\'cr, maehinerj ' fOl.lOdalionssho\lhl nlso be: cnpal1Ic o fln;1portng" ul l dyn;1mic alld vil)l'a(ory loadlOwhich t1lt' m ~ c J l H ' m::y i l n p o ~ c . Thc offoci of lhc;e dyn:lmic lOllds onlhe;! fOllliclniol1 is Ilc' ,;ub.ie'cl ()f lbis dC':;;ill guidc.

1. 2 .'\11 mnehil1e1j,S '.:hicl. h ~ \ V l ' modng pi\l'ts 01' through which materialmO\"( ;5 , l rW1S11( :;;0111(' dyn::mie load to llle!r foundalioli. The type,sizc tind t!el:;il (A tlH' m:u'h;ncs lIsd in mincr:t! proccl


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following Iist gives allowoble machine foundntion soilp n ~ : : ; ; l U l ' ( : S fol' :;omc common son


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10 l1lac:hil"j\"Y fo'Ulld:\Lion. Ir sudt n C"onlwcti(n is un:woid;blc.ailO of lhe follCl\"'n;:: ST.


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wharc ~ { ~ 1 i3 lhu sl:ltic clil"pJ:H::ell"lClJt of tile foundntion i r octadup:>n by lhe d i : : ; l u l ' b ; n ~ f 'JIT, onu lhe value in lhe ul"ackl'!tis the ";\111.!:;lliiic;1tion Fnrtol' ' ' , whieh cno be obloined fl'om(he ChOl ' l "'Jo' ... n 01 \ 'Pagc / \-1 o[ l\ppcndi:: A.1\ f O : l I 1 d ~ l i o l l l ~ ) U ' y vihl 'ntc in llny one of [our possihlc mocles,(;1('111:.,]1:, \ h c n ~ ;I('C ,;i:>:, sine!.; 'll'! villralion in S ~ ' r \ s 4,4.2l\lId '1. 4. C;,('!l!i:I\"O l\'."O po,:


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. !;nn1e time. 'f'!IC n"(III' .,1 frl' I , !) Ot..Jn4 .7 After fi]I'g th" h l ; \ ~ : i m 1 l l 1 1 tll"ll;lJituCl(' of vibr:1tiQn, i t sho\!lc1 he

.comp:1l'('l1 In till' :111owahl t: "mpli1.\ldes fOj" par t icula l ' frcquencycurves on P:lgC' A


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5.1 A machinc 'y foundaiion \\ 'hkh i5 ilctcd UpO:l by incidental11ll'gC force!'>, I sm:h a$ those fO\ll1dalions which support machineryin G rO\lp C,1I1U !: t he c J c ~ i g l 1 c L l to 'csist impacto5. 2 lrnpacl lO:1ds r. disting,lishcd fl'om dynamic londa in thatcJyn:\1nic l,):\(H (\rigin:1tc fl'om u n l : , l ~ l l l r c d elc111cnls of cquipmentanrJ [ll'e lu,m:tlly p t ' I ' i ( J d j r : 1 i l ~ ' :1pplied; \\'hilc lhc imp:\cl load$gencrall :- l'c':.:\ll\ [)'I):11 the U/1(: \ c'ness of si?c, 1'1I1e ;111


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26-ABR-2007 18:31 DE A (hbr i91 Rojas

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7. O C01\ : \11; !':T/1I1 y_ .-_._ ..........- - -7.1 The f01"l11\11a ::iVC/1 n Seeto:"! 4.3 "m ! 4.4 are basen upon

tho Dssumpti(l/l tho.l Ihe m:\Chincry support cOI1Hist oC adgid founc\ntioll sUPPOt'\t)O by 1.111 elstic soil. Ir lb efoundnlioll is 1101. cr.sc:ntiall:v l'i;id (for c:>:0I1"lp1c it moyc;ol1:;isl oC bcanu;, cr)l\lrnns :1J1d pie!'s). Tha!!:e fOl'mulae nustbe rno:lificrJ. licf(!1' 10 I h ~ s i g n Guide (;- 207. OO.

7,2 FOI' tho I j ~ l l ' V ) S C uf Il1is d(;sign .;(uidc, Ihe dynnmic oeto/1oC 1110 soi l Ls no! I ~ : ! ; o n "lo ,1(;(,0\1111, Le. , lile soil 15considerad tu be a 11"1;1.5,;105:; sprin;.

7.3 COllshlcnltiol1 shot,ld he givol1 to tllo"o f1\CtCll'l; which mighttC:1d lo )'csll'ain lIle found;lliun. Sdc P l ' o : ; ~ ; \ 1 l ' c s oC $oil o:"!n deep fOUlld;).tioll, " ':ilah p ~ \ ! l ' e C 1 ,1P:lllst foumbticn, etc . ," " 1 )\\'ould :'111 1l'll1cl lo 1 ' r : ~ l u c ( j disp),(;el11cnt alid incrc:\$e naturalf l 'equcncv

7.4 Ecfc:l'oncr:: "Dyl1nmies of B:zcs nnd FO'Jndton" by D. D.J'k:1ll.

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k - SUffncss c o n ~ t o . l 1 t fo r Suppoding soilkv - vcdic;1.1 mode (" ..kh - !1ot'i7.onUtl moda hv Ce 0.\ (ukp pilching- mocla '2.5 h; C'f :::. e ..k "ow j Dei 1110de l.; Cr - I.:le .y "

W - \Vei&;l! t. of machinc :tnd founclationIIV - Weight m O m C l ~ ' of inertil'l of 11'o.chinc 8ndfOUfH);:jtioll c.hlJUI a:d!> O[ n,1L;ion th'Qugh the

ccnlroid oC tl:.' base arcr, A - .tiro;). o SUPPo'ling base!E - MocnlU$ of compr'cssion of soil

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17'.- Disturbing forceT - DisturLing cO\lplc, i. e. Fcl6 - Ma:dmtlm o.mplituuc of vilJl'ation

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ALW,'/{'.!3LE A1.\PLI TUDE OF VERTI CAL V 8RATI

500 1 00 O 2. 000 5.000 10.000FRF.QUENCY (CYCLES1,1\t :UTE)

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APPENDIX A

PROPERTIES OF COMPACTED MATERIALr - . - - - - , - - - - - - . - - - - - - - - - - - - - - - . - - - - ~ r _ - - - - T - - - _ _ ;

Rfll l j . [ ( ' 01 Umil.'q'ofe"jilf" 11:( ; . \ I I I ; l j l l l ,


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} \ P l > l ~ N D r X - D11/\Cll l::RY DESCRI l?'l'J:ON1. CJ:ushing lIead2. Crushing Ch amb3. Cli.lshin; Bo,,l4 Ilain Shaf t5. Ecc(!)ntric6 . Orive Gear7 Drive Pul ley

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, .G'iR.'\'l'ORY CRus;n::R: USED TO CH'JSH om:'rhe main s h a f t , c a r l : ~ ' i n g the crl lshing head, i5 gyrated al : the botto:by meon5 of eccen t r ic und clrive g Q ~ r . The crushinq head, as it g y ~;:ates i ns ids the cl"ushillg bO\,'1, n


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design of machinery foundations

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