qDTicTF Tr- f . rnrnhl BORED PILES (Cont 'd ) .

Behavlor

SECTION Z

2.1 GENERAL

iJ':

The dravr ings shcw:-_

(a) the macrni tudes and disposi t ions of thev'Jorr i ing Loads anci moments that wi t r l :etransmit ted to the pi les at t r lmmedIcrre: I .

(b) ah: Ie l ,out . types and cl imensicns of thepi l -es which are those consldered to ; ;sui tablr : by the Enqj-neer having regardto. the rcquirenents of the t jor [s to Uebui l t upon the pi les and the groundcondi t ions revealecl by the s i teinvest igat ion.

n. !y changcs in the rayout type a.nd dimensionsof the p1-1es_nay af fe i t t r re ' ' i ; i ructural a" i ignand shal l only be made i f agreed vr i th theEnginees.

2.1.2 Sg

I ' ihen al l Tr ia l p i les have been approved theContract p l le s ize and lengths s i raf l beagreei l .

2.L.1 Pi le Lt>ads, I ,aycut and L_oad Def lect ion

2.I . 3 thq-Ugjn j l tund Condit ions

f f _ t lur ingr the instal lat ion of the Contracrl : i : " . lhu ground, condir ions Drove di f ferenrtrom thosc observed in the t r iat p i les crthose shown in the Si te Tnvest iqat ion Report .of i f such condi t ions are suspected theContractor shal l . vary the s izLs an(r . f engtnsof the r : i les vr i thtn lhe l imi ts ugi . .a-- 'between the Enqineer and the coni . . . " to, tor :nsure that the pi les are capable of meeCingthe recruirements of the Speci t lcat ion.

Should t l - re .Contractor conclude that hecannof rneet i l :e requirements of the Specif ica_t ion by construct ing pi les wi i :h in the l imi tsof s izes and lengths agreed he shal l at oncenotify the , inqi ineer .

$:, :

SPL-CTFICATTON. BOP.FD prLnS (Conttd) ,

2.2 DESIGNcll lTEF.I/\ "

2.2.1 Ul t imate Load

*

I ' Ihen a Tr ia l p i le test is carr ied out theUlt imate Load is def ined as th; constantload at which the Tr la l p1le cont inues tosett le at a steady rate or the ]oad at whichthe maximum sett lement_ of the pi le topdur ing one cont inuous foaaing iycf . is onetenth of the pi le base dlamei.er 'vrhichever lsthe lesser. When no tr ia l p i le test iscarr led cut i l re ul t lmate r ,o ia is def ined asthe i \greed C.r lculated Ult imate ioaa.

2.2.2 L.=.igg_L_""9_

The Desiqn Load is def inecl ln rerat ion to api le loaded 1n is.c lat ion, no nearby pi lesexcept those provldlng test react i in beingIoaded " .

tr,Jhen the Ult imate Load is measured. theDesign Load is the Ul t imate Load div ided bythe specl f ied Load Factor.

I '7hen trre ul t imate Load is not measured theDesign Load is the lesser of : - -

(a) the Agreed calculated ul t lmare Loadfor- the pl le div ided b,y the speci f led

. Load Factor.

(b) the A,greed carcurated ul t imate Load oft ! " -p i le base dlv ided by a Load Factorof_3.5 together wl th rhl agreedcalculated shaft adhesion.

2.2.J Load Factors

The over.al l Load Factors isof) \

2.2.4 y/orf1ry_!,oad

i

S.-rf f i i

to be a mini:num

The Working Load is the Design Load modlf ledtr-r a l lo l for group Lct ion pf ie "pu"fng-o,

anyother factors. changing the ef f lc iency'of thetotal foundat ion f iom that of a sfngie-lsolated pi le.

SPECIT'TCATIObI. BORID PILES (Cont 'd) "

?i : ; :

2,2 DESIGNCR.ITERTA(Contrd)

"

2.3 TnI i l I , PILES,

2.2.5 Sett lement

2.2.6 Pr:rmlssi l : Ie Overloac' l due to l . l ind

t t , Shafts -qtress

The sebt lement of a pl le shal l rnean thcvert ical mcvcment f rom the pcsi t lon beforethe conunencement of loaci lng. For a pi leuncler test the sett lernent at an\ , load( includinq zerc lord at end

" i - ; i " "Jr"g

cycle) is that at wrr lch the rate of vert icalmc.rvement bt- :comes less than sp€ci f ic :c l rate(see Appeni l i : i A). For pi les 1oaded andunlc.eded. throuqh a numh,Lr of "y; i ; ; " . i t ro_tnent stral l ] re the cumulat ive vert ical

movement.

The tr^lor\ irg Load cleflned above may beexceeded

-bV not more than 25g vrhen t l i ._character ist lc wlnci 1cad as c lef ined in Cpr t 0 is . rdded to the most adverse comntnl l ion

of character ist ic dead ancl imposer l Loar ls.

*4s-

Thc al10lvab1: compressive stress on the shaftof any plre due t ; the hrorki"g- i "oo sha1l notexceed one cluarter of the spe6i i reA cubecrushing strength at Zg davl l - - - -

2 .,-3.'L 9_.,ne!gg!1gl

Trial p i les shal l be of the same maLerialsand drrven cr forrned with i r .oJJ*. prant andin the same manner as Contract p l les unlessothervr ise agreecl . Tfru-posi t ions ane Iengthsof the rr ia l p i les shal i b; - ; ; ; ; .d

wirh theEnqineer

2.3.2 Arr . rngement for Loat l ing

Detal Is , r . f the- proposecr arranc{ement for testloac1lnq sha11 l r l .subrnl t ted r . r i - f i - ,e aoprovarcf the Sry1rr:gr. n,ei i .r" instarl-arion of Trlalp l les or-EEEFassembl ies .

2.3.3 Not j_ce of Comlrencement of fnstal lat icn

sh.r l l be gr lven at least 24of thc cof iunencement c, f eachand each tcst .

The Enqineerhours nc, t iceinstal lat ion

SPECTFTCATION. BORtrD FILES (Corrt ,d ) .

2.3 TRrALPILES.(Cont rd)

"

2.4 LOAD TESTSOI'i CONTRACTPTLES.

I f one or inore Tr ia l p i les arean instruct ion wi I I be issuedContractor to instal l and testTr ia l p i le.rs

"

2. 3.4 Sequence of Loacl i rg

Loadlng shal1 fo l low the test procedurespecl f ied in Anpendix B.

Thu sequence of loading shaLl be CyclesI to 5 inclusive fo l lowed by Cycle 6 whichsha1l he ei ther Incremental- lo ld ing to 2\r)esign Load or constant Rate of penetrat ionto Ul t imate Load as speci f ied in Appendix A.

2. 3.5 App-rgval of Tr i i r1 pl les

, f , - , . : , A Tr ia l p l le-wi l l be approved af terk.-- l?- j . , i cornplet lon of test loadinq i f : _

(a) the Ul t l_mate Load is equal to orgreater than the Design Loadnul t ip l ied t ry the f .oad Factor.

(b) the mater ia ls vrorkmanshlp and methodof construct ion are accepted.

f f a l l Tr ia l p i les are approved an lnstruc_t ion wi l l be issued for Lire Contractor toproceed with the instal l -at ion of theContract p i les whlch shal l be s imi lar to theTr ia l p i les or such modif led s ize (s) andlength(s) as agreed.

not approvedfor the

addi t ional

2. '4.L Instruct ion to Test

2.4.2 Select ion of p i l_e_s to be Tested

The Contractor may be instructed to tescload Contract p i les ln orcler to conf l rmthat they meet the rcquirements of thespeci f icat ion for road-defrect i -on behavior.

fhe F: l rg i leer wi l l select the pi les to becesred at ter thelr instal lat lon.

Detal ls of the proposed arrangement for testloadlng shal f b; =.r f ,* t t t "a to the Enqlneerfor approval before rhe inst i r i " t r#f f i .ntest assemblv,

2.4"3

SPECIFICATION " BORED PILES (Cont 'd) .

i€\#._,i

2.4 LOP,D TBSTSOI{ CONTRACTPILES(Cont 'd ) "

2"4.5

2,4 .6

2 .5 MATERIALS . 2. ,5 .1

2q)

2.4.4 Not lce of Commencement of Te,sts

The Eng-yr'rgr shall be gi-ven at l-east 24hourE-ffifdG of the commencement ofeach test .

_SSS.nce of Lcst foading

The- seouence of loading shal l be Cycles tto 3 using the test procedure srreci f iedin Appendix A.

Load Def lect ion Cr l ter ia

Contract Pl les shal l be deencd to complvwlth the requirements of the Speci f tc i t loni f : -

L:#&**-:aE"d

(a) the cumulat ive set t lement of theContract p i le at ] l t i :nes DesignLoad does not exceed one and naftt i rnes the cumulat lve set t lemenr_ ofa s i rn l lar f r la l p i le at Lr , t imesDesign Load.

(b) the residual set t lement when testload is removed is less than C"002 in.per ton of the test load or O.2S 1n.whichever - ls the lower.

Qual i ty of Mater ig ls

l 'Jhere the speci f icat ion and drawlngs al lowthe Contractor a cholce of mater la ls to beused, in the V,Ir-;rks, the materiaLs chosen andtheir proposed sources of supply shal l besubject to approval .

AI l mater ia ls shal l comply wi th theappropr iate Br j_t- i -sh Sirndard asspeci f ied or approved.

Concrete

Ccncrete shaI l be made vr l th cement,aggregate anC water. I 'Jo other inguedlentswi l - l be perni t ted unless specl f led.

AI1 cement shal l be del ivered to the s i - te inscaled containers or bulk cement lorr i -es cfsui table design and shal l be stored in awaterproof shed with a raised f lcor or asi lo of an accepted type.

SPECfFTCATTCN " BORED Pf LES (Cont,d) .

2. 5 I.'IhTFRr/TLS(Cont 'd) .

2tr ,? Concretc (Cont 'd) .

Cement shal l be used in the order 1t lsr i :ceived cn si te.

Aggregates del ivered to the s i te shal l beclean and sha1l be kept f ree f romdereter ious matter. Aggregates of dr f ferenttypes and sizes s l - ra lL be stored in separatehopRers or sel f . -c l ra intng concrute paveadrt :d,s separated by div id ing vral ls.

Admixtures may be permlt ted provided thedetairs of the ad.mixture and the associatedconcrete ni ix and tr ia l resul ts are approved.

Calcium chlor ide and admixtures containlngcalc ium, chlor ide wi l l not be permit ted.

2r5"3 Concrete Mixes

.+'5l:::.

ffi

The concrete shal l be a Deslgned l41x inaccordance with the recommendat ions ofc lauses 6.5 of Cp t f 0 and colrnply wi th thereguirements l1sted in Appendix B of th isspeci f icat ion.

The tr ia i rn lx desiqn ancl the resul ts of a l lprel i rn inary tests shalr be submit ted as soonas' they are avai lable and before concretework starts on s1te.

Mix proport lcns may be adjusted 1n accord,ancewlth Clause 6.7.6 of Cp l f 0 except thatapproval shal l be gained for any change lncement or the current margin"

5.4 Ready-mj-xed Concrete

Subject to apDroval for each srade ofconcrete the Contr i -c '1or rnay use ready-mixed concrete complying wlth th is Specl f ica-t lon ln the pi l lng works" Apprcval- may bewithdrawn i f thc concrete fa i ls to conr l ly .

l4 ix lng, del iveryr supply and j -ndependenttests shal l be in accordance vr i th RS 1926:1962 exccpt where directed otherwise ln th isSpeci f icat ion.

Each load shal l be accompanled by a del iverynote stampcd with the t ime of mixlng andstat lng t l ie c( , 'nsiqnee and quant i t les of theconst i tuent rnater la l_s lncJ-uding water andacidl t ives.

SPFC TFIC.I \TION . BORED PILES (Contf d) .

2 " 5 I'IATERrALS(Cont 'd) .

5 " 5 Sampl ing and Test inq Concrete

Thc sampl ing of v lorks concrete f romdesigned nr ixes s l : raI l be ln accordance withclause 6.8.2,2 of Cp 110 except that samplesshal l be takan at the mlxer or at the pointcf cast inq as directed. At least one sampleshal l be taken on each day that ccncrete ofthe grade is used.

' Ihe workabi l i ty of each sample: shal t bechecked and shal l be wl th in the } imits givenln ippendix C. In the case cf ready rnlxedccncrete a s lump test shal l be made on eachtruck loacl pr ior to thc concrete beingplaced.

The concrete f rc,m designed mixes sha1lccmply wi t f r c lause 6.8-"2.2 of CP f 10. i \nyccncrete which does not comply wi th thesereguirements wi I l not be accepted.

5, 6 Reinf orce-ment

Relnforcement shal l be del lvered tc s i te 1na clean condl t ion and shal l be kept c leandur l -ng stor ing, f lx ing and placlng. f ts i ra l - I Lre stored on racks c lear cf the grcund.Loose rust and mi l l scale sh.el l be removedbel iore placing.

Reirr forcement shal l be bent in accordancewj- th BS 4466 to the correct shape beforef lx lng and placing. Samples for bend testsl f required wi l l be selected bv the Englneer.

l ' i telding shall be carried out only with theagreemcrr ' t of the Engineer. Weldingmater ia ls shal l conform to and weldingprocedures shal l be carr ied out in accord-ance with the appropr iate Br l t lsh Standard.Cold-worked relnforcement to ES 446L shal lnot be welded.

' . i i

i i :

SPECIFICATION " BORED PILnS (Cont 'd )

2 .6 COIISTIIUCTf OI\ iGENERAL.

2.6. I Flacinq concrete

Site mixed concrete shal ] be placed in t tsf lnal posl t icn as soon as possible, and inno casu mL\r i i than hal f an hour af ter rn lx ing,Rr:ady-mlxei l concrete shaLl be pl t rced withinthc aqrecd t ime af ter addinq water andimrnediately l t leaves th. mixing truck oragi tatc ' r .

Concrete shal l be t ransported from the mixerto the posi t lon of the pi le in such a mannerth:r t segre<lat lon of the mix does not occur.The method of p lacing shal l be such as toensure that L.he concrete in i ts f inalposlt ion ls clense i. trr( i homr:geneous. Adequateprecaut lons shal l be taken by the use of ahonper,cr by cther approved means to ensurethat the concrete is not contaminated.Concre: te shal I only be placed through vraterl f agreeC by the Engineer. t rVcrter shaLl notbe allovred to bullE-[p-6 top of tiieconcrete c lur lng the placing of ctxcrete,Any such water shalt be rt?rnoV€d beforefurther concrete is placed "

Each pl}e shal1 be concrcted in one cont ln-uous operat ion imm,. :Cietely af ter the excava_t lon'has been completed and inspected. I fth ie cont inui ty of p lacing the c6ncreEe 1sinterrupted, nc fur ther concrete shaI l beplaced unt i l agreed by the Enqineer.

nt a l l t imes when concrete is being placed asteel f ixer shal l he in cont inuous at tend:ance to adjust and correct the posl t ion ofany reinforceinent whlch may be displaced.

2.5,2 Reouired relnforcement

The rninimum relnforcement reguirements aresirown on the Drawings.

2^ 6.3 Flacinq {y lnforceTent

I ie lnforcement shal l not be placecl unt i linspected and accepted.

\{ '":t :

SPECTFICATION " BORED rILES (Cont 'C) "

i:*'

2 .6 CONSTRUCTTOIJ - 2 .6 ,3GENERAI,(Cont 'd ) .

2.6 ,4

l i laci-r i re inforcem+nt (Cont!d).

Reinfcrc. :mr:nt ca.gt ls shal l be suf f ic lent lyIcnq tc ensurc that they remain at theircorrect level dur lng the placlng of thecr-rncrete and the extract ion of tempcrarvl in ing tubes. Wherc the ternporary- t ln ingtubc do(. 's nct extencl to the bottom of theexcavat i -cn thc distance by which therr : infc,rcement cagc shal l Lxtencl bclovr thebottom of the temporary l in ing tubc shal lextend be:lcr,r the bottcm of the temporaryLinincl tube shal l br : 3m"

The ln in imum cover to al l re inforcementshal l not be less than that speci f led onthe drawings.

Detai ls cf the means by which theContractor plans to ensur€ the correctccver to and posi t ion of the reinforcementshaI l be agreed.

Tolerances

The maximurn permisslble deviat lon att r i -mmed Ievel of the centre of eachcompletec- l p i le f rom the correct centrepolnt is 75mm in any , i i rect ionf . t f ,enaxlmum permi-sslble deviat lon t f iom thevert ical at any ]eve] of a f ln lshedpi le is I in 75,

Consecut ive ! : i1es

6i*

{*- 'ir*-- :, . {', - -J5 *.- , .. -*1{.^ ---- { l.*.-

$A-

{,&, n-<1)

C""vz.$ i._

t-r, '2- 1-{-;

2.6 .5

Pi les shal l be formed in an order and lnslrch a manner that no damage Ls sustalnedby previcusly f ormed p j_1es.

2.6. 6 Tempr>rar l r L in ings__gt_lcasings

Temporary l in ings shal l be of qual l ty ofmater la l lenqth and thickness adequate tothe purpose r : f prevent j_ng water andunstable soi l f rcn enter ing the pi leexcavat i . )ns.

Ecah tc:mpey6ry l ining shall be straight andtrue . lnd of uni form cross sect ion th ioughout.The intcrnal surface shal l be c lban anosmooth and free from dlstort lons that mavaffect p l le integr i ty dur ing removal ofthe tcmporary l in in. l .

SP6CIFICATION BORED PILES (Contta)

2.6 CONSTRUCTIONgeneraJ.(Cont t a)

2.6.6 Temporarv Li .n ings or Casinss (Contt AJ

Temponary h-nings shal l be placedwhenever water and soi l nray enterthe pi1e excavat ions, and shal lmaintain the excavat ions to theirful l r l i mensions and ensure thatpi les are completed to their ful lcross sect ional r l ' imensions.

Each temporany l in ing shal l beremoved in the line of the pil.ein such a nanner that no damageis caused to the newly cast p i le.

Temporary c 'asings shal l beextracted whi- le the concretewj-thin them remains suff ic ient lyworkable to ensure that theconcrete is not l i f ted.

When the casing is being extracteda suff ic ient quant i ty of concreteshal l be rnaintained within i t toenslre that pressure from externalwater, dr i l l ing fJ-uid on soi l isexceeded and that the pi le isneither reduce.d in sect ion norcontanr-Lnated.

No concrete shalJ. be placed i .n the-excavat ion once the bottom of the

casing has been J- i f ted above thetop of the concretei i t shal l beplaced cont inuously as the casingi-s extracted unt i ] - the desiredhead of concrete is obtained.

Adequate precaut ions shal.J- betaken in a] . ] . cases where excessheads of rvater or dr i l l i -ng f lu idcould be caused as the casing i -swithdrawn because of the.1i splacement of water or f lu id bythe concrete as i t f lows into i tsf inal . posi t ion agaJ-nst the wal-1.of the piJ.e shaft . Where doublecasings are used in theexcavat ion, the proposed methodof working shal l be approvedo

;Jtri-'.

s-1 .1

SPECIFICATION BORED PILES (Contta)

2,6 CONSTRUCTIONgeneral( Cont t a)

2,6.7 Concreted Level

After concret ing and removal ofal l temporary l i -nings the levelof the concrete surface ( t f reConcreted Level) shal l be asfo]. ] -ows. Tr i-mmed 1evel is theleveJ- of the head of a piJ.eafter trimrulng to remove surplusconcrete below the concretedlevel and is the level of thehead of the pi le shorv-n on thedrarv j-ngs.

i ) Fon a pi le with tr immed-level not more than 41 6t lground J-evel the concretesurface j .s to be betweenbelow 6'r and 1t 6 ' r abovetrimmed ]-eve]..

i i ) For each L0rt by whi-ch thedepth of trimmed levelexceeds 41 6n the upperlirrri-t for the concretesurface is raised above1t6' t by 2"o

i i i ) Where temporary l in ingsare used to prevent rvaterenter ing the pi l .e excavat ionthe concreted level shal]-be at least l0rr above thestanr{ ing level of groundwater.

iv) Where concnete is placedunder water or driJ.J.ingf lu id the concreted levelshal l be at least Zr abovetr immed leveln

2.6, B Backf i l l ing emptrr bor ing

Every empty boring shal l - bebackf i ] - ] -ed above concreted levelto ground J-evel not more than24 hours af ter concret ing iscompleted. The lorvest 6r of thebackf i l l . lng shal- l be wi th sandof colour contras'bing with theadjacent soi- lo

t li:i

SPECIFICATION BORTD PILES (Contta)

1

2.6 CONSTRUCTIONgeneral(Contt 6)

2.7 DETAILS OFCONSTRUCTIONBORED PILES

2.6.9 Records

The Contractor shal l make acomplete record of each pi le.

One set of the records for a] . ] .pl les shal- l be kept on si teand be avai lable for inspect ionduring the progress of theContract .

Two signed. copies of the completerecords shal l be suppl ied to theEngineer wi-thin two weeks ofcomplet ion of s i te worksr

This sect ion of the Specif i -cat ion shal.J.apply to pi l ing operat ions in which soi lis excavated by grab or drop bucket orby mechanical . augerr

2.7.1 Use of dr i1 l ing f lu id

DriJ. l ing fJ.uid shal l be used inconjunct ion rvi th temporary casingto maintain stabi l i tv ofexcavated hole.

2.7.2 Dni l l ine F]-uj .d

The fJ-uid shal.J. be preparedssampled and tested as speci f ied.as in Appendlx C. I f testsshorv the fJ.uid does not complythe f lu id shal- l . be whol ly orpart ly replaced beforereinforcement and concrete areplaced.

2.7. J Sqrface Level of Dr i l l ine Fluid

The surface 1-evel of dr iJ- l ingf lu id shalJ. be kept at least 3 tabove the standing J.eveJ' ofgroundwatero I f this levelcannot be kept the Engineershal] . immerl i ately be inf ormedand the Contractor shal1 takemeasured to prevent col l .apse ofthe ground,

te+

SPECIFICATION BORED PILES (Conttd)

2.7 DETAILS OF 2.7.6 Cleaning of Pi le BasesCONSTRUCTIONBORED PILES On complet ion of excavat i-orr ,(Contta) al l loose r l is turbed and

remoulded soi l shal l beremoved from the base of thepi le.

2.7. / Pi le Inspect ion

The Contractor shal l a l low foreach piJ.e excavat ion to beinspected by the Engineerbefore reinforcement and concreteare placed.

The Contractor shalJ. provide al1necessary faci l i t i -es to enable

. the Engi-neer to rnake theinspect ion of each pi le excavat ionincluding faci l i t ies to checkthe depth vert ical i ty and posi t ion.

2.7 . B Fi-eld Control in Construct ion

2.7,8.L Determ-inat ion of p i le lengthand founding strata of the pi les

The tenderer shal l al ] -ow j .n histender for carry ing out f ieJ-dcontrol tests for detern- iningthe length of each pi le to becast"

Any control method based soJ.elyon a qual i tat ive visualexarn-Lnat ion of the soi l samplestaken out of the boreholedur ing instal l not be accepted.

A control method in the form ofquant i- tat j -ve tests shal1 be thecr i ter ion for acceptance. Inthis respect, a preferred methodof control is the StandardPenetrat ion Test (S.P.T.) orDeep Sounding performed inaccordance with B.S.L377 or anyother equivalent quant i tat ivetest to be approved by theEngineer "

l

t i

SP iJCI. ITICATION BORED PILES (Contta)

'1 "7 uii ' t 'ArLS 0F

C(]NSTlTUCTIONtJ0tioD I ' ILts( Corr . t t d)

, .7Q'ra a / CA a L

' )1R')'a / ava-

Deterrninat ion of p iJ.e lengt l - rand founr l i ng stra 'ba of the

Should the tenderer elect touse S.P.T. as the f ie ld controltest , S.PoT. shal l be carr ied"oub a'b every 510'r j_nterval orat any change of soi l strata i fthe carry ing capaci ty of thepi le is part ia l ly based on pi leshaft resistance.

Soundness of the Cast-1n-si tuConcrete

The tenderer shal l proposemethod for checking the soundnes;of the cast- in-s i tu concrete ofthe pi- les instal .J.ed" One of thepreferred rnethod is to load. test5% of the pi- les instal led. tot l ice rvorking loado Horvever,the tenderer i .s at l j .berty topropose any ot i rer- met l - rod forchecking the sound:ress of thecast- i -n-s i tu concrete of thepi le.

t

SPECTFICATION. BORED ITf LES (Cont 'd ) .

,2.8 FTLE TESTASSEMBLYAI.JD TESTPI?OCEDUNN(APPEITDD{ A)

trILE TEST ASSEI4BJ,Y

2.8.1

The test e issembly shal l be capable of thesafe appl icat ion of the fo l lowlng lc,ads.The method of concluct lng the stx ih cycle ofPreLlmlnary Fl le lo:ding ls sneci f ie&. (Tr,is incrernentar LoadinE and cRt,L is constanti iate of penetrat ion Loadirg) .

Dcsiqn+

Loada

(a ) Tr ia lPi . les

Required TestCaeac l ty

qf*.,re ron,E ror, ii.Cl

q$t

-t;r:,lTtnn

Tonw3

Y"

-T-t

(b) Cc.ntract Test capaci ty tc be I f t lmesP1les Design Loacl stated in the

[ ' i ] -e ScheduLe Appendix A

., 2 . B. 2 T-e_:!_,19 egm]:fy

Laycuts of the test assembly must beapprcved by the Enqinecr.

Thg test asse,rnbl l r shal l be constructe, j andsupporter l such that safe access to al lparts of the assembly may be maCe at aI It imes tLur inr : a test "

The force tr: lo.rd the pire shalr be provrd.ed,by jacklng aqalnst the react j .on of k lnt ledge.

I f ln the opinicn of the Encineer the s l teis such that pl l , : upl i f t caiseATy Criv lngadjacent pi les mav occur the r* .c l ion fort r ia l 1r i1e tests shal l be provlc led bytension 1; j fgs vrhich shal t bc , f r j_ven i -n anorder to be asreed wlth the Englneer.

Dr lven pi les shat l not be use- l 3s tensionni les for contract p, , i le tests.

fr r'. -- ?uc t J- I r . B1 /671 ^ TOWtrk pIL"

TTT / I {

ECTFICI,TION. BOttED I ILES (Cont 'd) .

a'":

2.8 ITLE TESTASSEI4BLY1\ND TESTPR.OCEDURE(appsr.rou( A)(Cont 'd ) ,

2.8.4

Z " 8, . t I . I

2. 8.4.2

2.8.2 39:. ! .- l€-:g! ly (cont 'd) .

The Sul : -Contractcr shal l sutrmit completedetai ls of the test assembly he oroposesto adopt for the Encl lneeros-AccenEance.Thesa ctetairs shaf-ll-riFrfiEE a comprere rlstof al l equipment to be, usecl in the testincluding rnanufacturer 's namc anc cataroguenunrber and any other ident l f icat lon marks.

2.8 .3 ! te! !c, i of annly inq Load to the Test pi les

The test force shal l be annl ieC concentr i -cal ly to the test p i le by means of a s inglehyCraul lc jack. hthen the Ccrnstant p.ate ofPenetrai : icn test is specl f led the jack punpcapaci ty shal1 be aclequate tc maintain thereguire<1 rate of p i le movement.

The permlssible extenslon of the jack shal lbe such that for each tr ia l p l1e lhe pl tecan be moved cont lnuously and withoutrep,ackingl for a dj-stance f 5t of the testpl le base diameter. Al lovrance sha11 l : ,emarlc for " take-ul-r" cf the react icrn c- tsst- ,ml- , .1 w

pi1_C*_tgs.t_ e_rs_1bl1 s-vver!'v*i '

l:Ie a s _u.r e-me n L - _g r_*I, o a aThe'whole load shal l be measureC l :y acal ibratecl sauge cal lbrat ,ed hy an ipprorreoauthor i ty.

Vert j -cal movement shal l be measured by fourr1lal gnucre extensometers.

Th.: extensometers shal l be posi t ionedmutual ly at r ight anqles and at esualdistanct: f rom the ccntre of the tJst p i le.

The plur igers of the extensonreters shalr bearon plane glass or machined metal p latcs setIevcl .

Tc extencl the ranle of the extensometers 1, ,th lck metal or ! ; lass blocks wi th paral Ie lsurfaces shal l be prcvic lecl in suf i ic ientnunber to a] Icw cont lnuous measure.ncnts ofdef lect ion up to I 0t of the test p i lec. l ianeter.

B. ] ] I I , " 81 / 6'1 - j r lArrrr lr . i r ;rr

SI ' l IC I i : ICA' I TON BORED I) ILES (Cont 'd) .

?. B. PILE TXST 2* B_-1.3ASSJ]I!$LY

A}{D T]1STPnoctrDUrdl/ lr D Drr l.Trt T1: Z' \\ (^r A! ! rv.gL rL/

(Cont ' d )

2.8'*1. t ' i

) . R q4 av. J

)Ct( lL at v. J a*

?(. \C1PaatJ.-

?AR?LavaJrJ

1:, benchmark rvhich hc-\s i tsr : f s i te con.- l i t ions shaI l

The levcl instrument anCsult r ) - le to ql iv lnq dj . rcctr .ccuracy of . 0 04 " (* .g " awith e pt ic.r l rn icrom*tcr,

IeVi :1 indcpcnJcntl -

- . , , ^ - . '1

staf f shal l i :craacl incrs to annr, , r - i q. ' - I cv. . I

and an Invar staf f )

shal l keep the t ;sts undcrcor lpe-tcDt supervis ion to t i rc

the Enoineer.

Referunce Beams and Renchmark

T'hc ref crerrce i - reams shel l L- ,c securely f ixedLr: adequatc supports , e . qt " i :o l ted r-rr welc ledto str le l stakes clr iven intcr the qround.

i rote:ct ic,n cf the Test Assenb,Iy

The ent l re mi,rasur ingr assembly shal l l :eprotr-ctet" . throu. lhout test ing against ra in,c l l rect sunl ic;ht anC any cther dlsturbancewhich coulr l af fect the rel iabl ] i tv ofreaci ing s .

A nraxinrum/minimuni thermometcr (oC) shal l i ,enr^rr i r l , . r l an. ' l f

- rmnr. f a i - t t f i : r r ,at l i nc:s sh,r I I ber{vur u !vr .urrrr>

taken at r . ,qular lntervals throuqhout t i retcst ner ic. i :@Concretr : Strenr i th

i i l t :s sclect . :C for test ing shal l not beIoaded unt i l the ccncrete strenqth is shownl- ,y cube tests ( the resul ts of which ,ere1n b.rrpretc- :C ln the rnann-r spcc i f icC ) to beat least twice the pi le stress at thegreat i :st test load ( ignor lng any reinforce-mcnt) or the pl le concrete is at l "east seven.1avs olr l whicht ,v.rr g iv. :s the lcwer per iodcf t i-mr: .

Sup( i rv i .s ion cf TesLs

Tfrc C<rrr t r , lc torcont inu. iLrs and,sat is f act j - , - r r j of

I raci l l t rcs icr thc Enl incer

- i , I l r lccessarv faci l i t ies sha]1 I e proviCeCti , . :n;rhle tht- I lnqinecr tc, t . lk t t nt l ch, :ckrsJi l in,- ,s r l r - r r inc the, p iogress of the te sts.

SFECIFICT,TIOI ' I . BORED PILES (CONI'd) .

'2 .9 " I , f L] l Ti is ' t 2 .B .5 . ,^) D ia , l Gauc, le l ic .ad inqs/,li S iltvi-D,L'yAIID 'L ig,T DiaI . lauqc rcacl ings of p i lc rnovement sh: I lI ,ROCtrDII ITJI ] :e mac, le at f reguent intervals c lur inr l each(; : tPPEl i i -D.al : A) pi le loaLin, l cvcle as agreer l vr i th the(ConL'c l ) Fn'1 i l l . " r r -

2.8.5,5 i iat_. : , f Vert ic: I l . lovcurcnt Def in inc:9.Elach incrernent of lc t36 shal l i :e malntainedunt i l tht rate of set t l rNrent does notcrcceC " 002 " in hal f an hcur rneisurer l cvera hal f hour interval- anci thc amount ofsct t lernr,nt shaII be that recorclecl vrhen thisrata= is reachec.

2. 8.5. 6 ' lc ,st Lc,e:L.Cyc. lg:_ 1 _Ic 5

Loet l inS ; ind unloacl inc_- and the taking ofl "evei rcac- l1nqs straI I ] :e made in thefc l lowing s€eu€ncu of each Test Loa, l CycIe.

( f ) T 'ake l t :vel reaJlngs of the suppcrtsc: i t i l . , reference l - :eams ani test p i l -e, l : r turn

Teet LceC Cl lcIe

CYclc C,tcfe Cycle Cycle CycIer23-1 5

( i j - ) / ippIyLoar-1 t.:q iv. , txDL DL I lxDL I \xDL I laxDl,

( i i i ) Di t t , - r lxDL r txDL I \xDL l .*xDL 2xDL

(iv) Di t t . txDL(rr) Di t tc DL

I . l i , : Dl , = De si l rn Loat- l

(v1) Take l .e l 'e l raadinqs of the supports ofof thr , : rcferencc beams an,J testrr i .Lc c latum .

(v i i ) Unloac1 i r r thrce 3pproxim.: t ; ly t rc iualStr, ,DS "

SFIICII : ICATI ON I_rOi€D i . ILt : tS (Ccnt ' t r ) ,

2.,8" pfLE TI jST 2.8.5.6 ISst r ,o"a Cy.fr" f to S (Cont,d)./TSSEI'IBLt'

fLl{D TlilLlTPiIOCEDUIIll(i\PPtrt:lDr.){ A )(conb 'd )

(v j - l i ) At zero load al lovr pl le to recoverunt i l the rate of rebouncl does norexceecl 0.05mm ln hal f an hour.

( ix) ' Ia l ie Lcvel readings of the supportsof the reference beams and testpi1 c datum.

2.8.5,7 Tcst Load Cycle 6

Incrcrnental loading ( IL )

blhcn incrernerr ta l lo.rdinq is spcci f ieC f orthr Cyclc 6 the proc! :dure shal l be asf o l - Iows: *

( i ) Take }evel readings of the supportsof the referc-nce-, beams and the testpi le daturn.

( i i ) Apply 2 t imes Design Load"

( i i i ) ipp ly ' ) , t ime s De-s 1gn Load .

( iv) arr l ly 2\ t jm.:s Desisn Load"

(v)_ Tlakc, level readings of th. : supportsof the refera,nce beams ancl the-testpi lc datum.

(vi) Unl-oad in t l . . ree approximatcly r .eualstcps "

(v i l ) At zero load al low the pi le torecovcr unt i l the rate Of raL,ounddo*s not exceed "0C2' , per hal f -hour.

(v i i - i ) t 'ake l r :Vcl readings of the supportsof t -ht : refurcnca beams and the testpi le daturn.

Constant Ratc of Penctrat ion Loadlng (CRPL).

( f l :en constant r :ate of penetrat ion loadlngls spccl f ied for the Slxth cycly, loadlngshal l be in such a manner as to malncal ,n aconst;rnt ratc of penetrat lon t i i roughout,TI-rc rate of pene trat ion 36lnn1- ' : r l qh.- ' l I h -

0.003 " per minute.

SPEC TI i ICATIOI. I BORED PILES (Conttd)

?t i

2.,9.

j ' IUJ TtrST Z.8.5. '7;iSS]i}{BLY

A}JD TiIS'rlPROCXDLNTI(APPEitDIX A )(Cont 'd ) .

2t8.5,8

CONCR.BT'E(APPEtrDn{ B)

T,:st Load Cycl-e 6 (Cont 'd) .

Rcadings of load and movement shal l betaken at intervals of f 5 seconcls to designLoad and thereafter at suf f ic ient f requencyto control- the rate of penatrat ion anddef ine proper ly the load-s-t t lenrent curve.The elevat ion of the datum beam suppol : tsshal l be checked L,v precise levef wi t f ,refcrence to a f ixed bench mark before theconnencement of the test and at t i rcmaximum load.

' Iest Reports

At the conclusion of work each day theContractor shal l send to thc Engincer acopy of h is dai ly record shceEl--

The Contractor shal l send to the Engineervrithin one week of the completicn-6E-EEEftest four copies of a l - l records graphs andresul- ts of laboratory and in-s l tu testsrc late:d to the lnstal lat ion and test ing ofeach pi le tested. This inf ornrat j -on shal linclude load against set t lement diaqrams.

Gradc

I ' l in lmum cement content whereconcrete 1s to be placed by t ramic

l t laximum cement content

l ' laxinrum frce water/cement rat ic

i rJorkabi l i ty

*0.5

The measured slump valuesshal l be wi th ln the ranqeof 6" to 8".

* l . i l4

J I JW IJJ1

61 5 lbr /cu . yd .

s 5 0 kglo3

S[ 'LC l FI .CATIOI. ] . BORIID PILTS (Cont ud ) "

2 " t )

2 .10.

col:x3Rli'ru(iPPitNDrx(cont 'd ) .

DnII,I.,IblGI l I , .J ID

B)

Trlal mi:<es. For each grade fcur consccut lvcbatches siral I bc made and six comnressirre strengthspecimens takcn from each batch. Two specimcnsfrom eacir batch shal l be tested af ter cur ing forj d." . rz. ' l 1. wo ;r f { - . , r - n,rr i nn €or ?B daws ,rrrd LWO af tcf,gqj /J/ug-) 'J

cur lng ln 3ny othcr , rgr- ;d reglmc for an agreedper lod. I ' lorkabi l l ty and compressive strengthtests shal l bc made as spccj- f ied. The concretewl} l l - .e accepted i f i t compl ics wi th the speci f ledconpl iance l in i ts for concrete cured ln accordancewith BS IB6I.

De:tal Is cf test procedures

Method of ass.ssment of concrete

As BS TBB}

^ -a^^AS IJb fJZO

(apprilorx F)

2. I0. I Bentoni tc

Thc qual i ty of Bentoni te suppl ied to s i tefor use in the Works shal l accord wi thSpeci f lcat ion DICP4 of the OiI Companj-esI ' tater la ls , ' issociat i -on " Eentoni te sha] l - beobtained froni an approved manufacturer andshaI l be dc, I i lzered to s i te 1n bplkcontainers or sealed bags marked with theidcnt l ty of the manufacturer " The Contrac-tor shal l - cbtain the m.ansfacturcr 's cert i f i -cate chovr i i rg the fo l lov,r ing propclr ies ofeach consignmen'c c ie l ivered to e i te.

s. (a)

I l - \ l

Apparent v iscosi t .y in cont ipoises

Gel strength range in \Tewtonsper sguare rcetre

2 " , 10,3

2. 'LO-2 Storaqe of Bentoni te

Bentoni te shal l be stored in s i los oi anaccoptcd type or in a vraterproof shedrvi th raised f loor.

}!i::i+q qf Lb'_iF

Bentoni te, c lean t lat<=,r and approvcd sl- Ia11be mixed within thc agreed proport ions inan acceptcd nannor ' to produce a dr i l l ingf l r - r id sui table to r , ra intaininq thestabi l i tv of excavat ions "

SPECIFIC;,TION BORED PILES (Cont 'd) .

) 10. Dg,ILLIi, IO.PLUX,O(APPENDIX T )(cont 'd ) .

2. j .o. , i lgnrpl ing and Test int t

Each batch of f reshly prepared or reconst i -tuted slurry shal l be sampled and testedand th: resul ts accepted befcre i t ls usedir-r excavi i t ions. The f requcncy of sanrpl ingand tcst lnr l s lurry f rom var ious parts ofthe ( jxcavat ions shal l be aqrccrd.

T-ellsThe Corrtractor shaII establ lsh a sui tablyequipped and propvr ly malntained si telaboratory and providc skl l led staf f andaII necessery anparatus to undertake thesanrpl inq . rnd te st lng.

Th.: tests glven in the fo l lowj-ng tableshal l be carr ied out in acccrCance withthe procedures given ln AFI F.P]38 SixthEdit lon . l ipr i l I97 6. Var lat ions ln testprocedure ani t .he number of tests madc oncach sample shal l be agreed.

2.10.5

Tests and compl lance values. for dr l l I ing f lu lCprenared f rom Bentoni te nanuf acturer l in the U. K.

Froperty Test m,=thodto be andm;.. qt t r r , r l - r r1r , a r a l - r r cJl , | - ' \ } I u uuJ

Compl iance v: IucsI leasured at 2 0oC

API R.P I 3Sect lon

lq ql lnr ! l i ; r l" - r L-

to pi le( :mn I c.

f rompl lenr i r . rt ' t r \ / r

tonl rni na

concret

S.[ 'ECII ' ICATION " BOIIED DILES (Cont ,c ' l ) .

2 " I0. n&rLl . r l , la 2 r 10.5 ISgq: (cont 'c l ) "r.'LUID(Ap'E'DIX Densi ty l {ud }ralance I Less than Less than

F) l .LOglml l . r5glml

(cont 'd) ' F lu ic l loss Lorv tcml.rera* 3 Less than Lcss thanIoss ture test 40mI 60mI(30 nln" f lu ld losstest)

Viscosi tv l {arsh cone 2 30 to 70 Lcss thanseconds 9 Lr seconds

Shear She .eromcter 2 19 to l0 l ' l / ? ^to

10N/strength ml nr '( I0 min .gerstrengt i r )

" Fann yisco* ' t 4 ^to

40N/ 4. to 4011/meter m' mz

Sand Sand screen 4 Less than Lcss thanccntent SeE 5Z I 08

pH Electr ical pH 9 . 5 to 9. 5 toIneter to 1 0. I 11 . 7BS 3445irange pH 1 tc

' r4

2. IO-6 CoTpI lance

Cumpl lance wi l l be accepted t f the const i -tu:nt mater ia ls neet L.he requiremcntsspuci f ied and thc tcst resul ts are vr i th int .hc ranges shovrn 1n the Table above or suchother ranges as are agreed.