d.f.i. helical presentation 7.ppt

8/9/2019 D.F.I. Helical Presentation 7.ppt

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INTRODUCTION TO HELICAL PILES &

HELICAL ANCHORS

**1/27/09 VERSION**

DRAFT – For Committee Use Onl! Not "or Distri#$tion

%RE%ARED &' T(E (E)ICA) FOUNDATIONS AND TIE&AC+S

CO,,ITTEE OF T(E DEE% FOUNDATION INSTITUTENote to Instr$-tor. Te DFI oes not o-te eli-l "o$ntions oer

oter t3es o" "o$ntion n n-orin4 sstems5 It is intene tt

tis 6ill #e one o" mn instr$-tionl tools o" te DFI5


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O$tlineI5 (eli-l %iles n An-ors

De"ine

II5 (istori-l Deelo3mentIII5 Teor Desi4n

A5 Teoreti-l C3-it

&5 Instlltion Tor8$e Correltions

C5 &$-lin4 n )terl Resistn-e

D5 ,inim$m De3t

E5 :ro$3 E""e-tsF5 Corrosion n )i"e E;3e-tn-

IV5 %r-ti-l A33li-tions A5 Sorin4 n Ert Retention

&5 Uner3innin4

C5 Ne6 Fo$ntionsD5 %i3elines n Utilit To6ers

V5 Cse (istor

VI5 Contin$e St$ A5 Re"eren-es

&5 Or4ni


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(eli-l %iles n

An-ors De"ine


4/68

(eli-l %ile. =F-tormn$"-t$re steel"o$ntion 3ile -onsistin4 o" -entrl s"t 6itone or more eli-l #erin4 3ltes5 Term

4enerll $se "or -om3ression 33li-tions>

(eli-l An-or. =Sme s #oe e;-e3t teir3rimr 3$r3ose is "or ert n-or4e n

oter tension 33li-tions5>

Oter Terms. s-re6 3ile! eli; 3ier! s-re6 n-or! eli-l 3ier! tor8$e 3ile!

n tor8$e n-or

De"initions


5/68

(eli-l Fo$ntion. =A "o$ntion sstem "or

#$ilin4 or oter str$-t$re -om3rise o" tlest one eli-l 3ile or eli-l n-or element5>

De"initions


6/68

De"initions

Common Com3onents

Terminolo4

Centrl S"t

%ier C3

E;tensionsCo$3lin4

)e Se-tion

(eli-l &les

%it-

%ilot %oint


7/68

E;m3le Instlltion %ro-essDe"initions

Instlltion

15? Rotte le se-tion into

te 4ro$n $sin4 r$li-

tor8$e rie5

25? Att- one or more

e;tensions n -ontin$e

rottion5

@5? (lt instlltion 6ens3e-i"ie tor8$e is -iee5


8/68

De"initions

TORQUE

MOTOR

TORQUEINDICATOR

HYDRAULIC

MACHINE

HELICAL PILE

LEAD SECTION

DRIVE TOOL

DRIVEPIN


9/68

Vei-le,o$nte Tor8$e ,otor

3,500 FT-LB

6,000 FT-LB

12,000 FT-LB

20,000 FT-LB

And !"#nd

De"initions


10/68

De"initions

TORQUE

MOTOR

REACTION

BAR

FOOT

CONTROL

HELICALPILE

SHAFT

DRIVE

TOOL

DRIVEPIN


11/68

S$%&'! S(&)*Un4ro$te?

S$%&'! S(&)*:ro$te?

R#%nd S(&)*:ro$te?

T3es o" (eli-l %iles/An-orsDe"initions

R#%nd S(&)*Un4ro$te?

Note. Oter t3es in-l$e -om#intions o" tese5


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Ant4es o" (eli-l Fo$ntions )o6 mo#ili


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Disnt4es o" (eli-l

Fo$ntions Un#le to 3enetrte -om3etent #ero- 6ito$t

3rerillin4

%otentil re"$sl in e -o##le n #o$lers

Instlltion i""i-$lt in trs "ill 6it -on-rete n

oter #$ilin4 mteril e#ris

)o6 strt$3 -ost -n res$lt in less 8$li"ie-ontr-tors

&$-lin4 limits -3-it in er so"t soils

)o6er lterl -3-it m re8$ire $4menttion

in some -ses

Use o" tor8$e s eri"i-tion o" -3-it neesto #e tem3ere 6it -l-$lte teoreti-l

-3-it n en4ineerin4 B$4ment

S3e-il ins3e-tion is re-ommene

De"initions


14/68


15/68

(istori-l %ers3e-tie(istori-l %ers3e-tie 1st Re-ore $se o" S-re6 %ile 6s # Ale;ner ,it-ell

in 1@ "or ,oorin4s n 6s ten 33lie # ,it-ell to,3lin Sns )i4to$se in En4ln in 1@5

In 1@! te 1st S-re6 %ile )i4t (o$se in te U5S5 6sConstr$-te # C3t5 illim (5 S6i"t t &l- Ro-

(r#or in Conne-ti-$t5 S6i"t $se ,it-ell S-re6 %ileTe-nolo45

In te 10Gs n GH0Gs! ,ore Tn 100 S-re6 %ileFo$ntion )i4t (o$ses 6ere Constr$-te Alon4 te EstCost! te Flori Cost n te :$l" o" ,e;i-o5

To! eli-l "o$ntions re $se re4$lrl tro$4o$tte 6orl5

(istori-l Deelo3ment


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Erl %re1900? Uses o" S-re6 %iles

)i4to$se "o$ntions ,oorin4s O-en "ront 3iers Ril6 #ri4es

Uner3innin4



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,it-ellGs S-re6 %ile 1@(istori-l Deelo3ment


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“on Submarine Foundations; particularly Screw-Pile and

Moorings”, by Alexander Mitchell, i!il "ngineer and Architects #ournal, $ol% &', &()(%

“ whether this broad spiral *lange, or “+round Screw,” as it may be

termed, be applied to support a superincumbent weight, or be

employed to resist an upward strain, its holding power entirely

depends upon the area o* its disc, the nature o* the ground into which

it is inserted, and the depth to which it is *orced beneath the sur*ace%”



19/68

,ile Er 190019H0?

Tere 6s =8$iet> 3erio tt s6 te rise o" oter"o$ntion te-nolo4ies! n te e-rese in $se o" S-re6%iles5

D$rin4 tis time oter ee3 "o$ntions s$- s Rmon!Drille Fo$ntions! Enlr4e &se Fo$ntions! Frni%iles! et-5 eelo3e lon4 6it mBor eelo3ments inme-ni-l e8$i3ment! e545! r$li-s5

In 19H0! :$l- ilson 3$#lise =Te &erin4 C3-it o"S-re6 %iles n S-re6-rete Cliners>



20/68

,oern Er 19H0%resent?

An-es in instlltion e8$i3ment

An-es in 4eometries

In-rese nee "or lterntie "o$ntion sol$tions

In-rese reser- into #eior

In-rese 33li-tions tro$4 44ressie

mretin4



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Typical Helical

Foundations



22/68

Teor

Desi4n


23/68

Fo$ntion An-or C3-it

Desi4n Consiertions. Teoreti-l C3-it

C3-it.Tor8$e Correltions

Vrio$s A$4menttion ,etos

%reio$s E;3erien-e t Site Contr-tor E;3erien-e

)terl Resistn-e

Corrosion

:ro$3 E""i-ien-

S3e-i"i-tions

Site A--ess

Contminte Soils

E-onomi-s

Teor Desi4n

)o-tion o" ter T#le

%resen-e o" &o$lers

Do6n Dr4

&$-lin4


24/68

Desi4n Cl-$ltions

Teoreti-l $ltimte -3-it no #etter tn. In3$t Dt

Soil 3ro3erties ter t#le lo-tion "l$-t$tion

)os %reio$s e;3erien-e t te site

In3$t Ass$m3tions Estimtes Correltions Dist$r#n-e/Remolin4

Teor Desi4n


25/68

Inii$l &erin4 %lte ,oel

Totl -3-it e8$l to s$m o"inii$l eli; #erin4-3-ities

C3-it $e to "ri-tion lon4

s"t 4enerll ss$mene4li4i#le

E;m3le.

( J Σ A-NC K 8N8 K 1/2γΒΝγ ?

6ere A J Are o" eli-l #erin4 3lte - J Soil Coesion 8 J Oer#$ren Stress γ J Unit ei4t o" Soil & J (eli; Dimeter NC! N8! Nγ J Tritionl &erin4

C3-it F-tors

Teor Desi4n

Tis Term T3i-ll Omitte in

(eli-l %ier Cl-$ltions

2 to times

imeter o"

eli-l #erin4

3lte! t3i-l


26/68

T3i-l &erin4/%$llo$t C3-it

S"t Si250> SR

257H>@5H> O5D5 RND>> O5D5 RND

>12> O5D5 RND

Allo6#le C3-it

10 to @0 tons

10 to @0 tons20 to 100 tons

L100 tons


27/68

E""e-t o" :ro$te S"t

. / ΣΑ(Νcc + 010)

"nd 2earing Stratum

Stable 3!erlying Strata

* / Σ[π4* s∆5* 66ere.

D J Dimeter o" :ro$te S"t

" s J Sie Fri-tion n Aesion

∆)" J In-rementl %ile )en4t

t / . 7 * +rade

+routedSha*t Section

.elix Plates

Teor Desi4n

Note. :ro$tin4 te s"t o" eli-l "o$ntion is 3ro3rietr 3ro-ess tt -n onl #e one $sin4-ertin mn$"-t$rerGs 3ro$-ts5 Noneteless! i" one! te -3-it m #e -l-$lte s so6n #oe5


28/68

E""e-t o" Do6n Dr4

. / ΣΑ(Νc + 010)

"nd 2earing Stratum

onsolidating 3!erlying Strata

* / Σ[π4* s∆5* 6

t / . - * +rade

Sha*t Section

.elix Plates

Teor Desi4n

Note. Do6n r4 -n o--$r "or eiter 4ro$te or $n4ro$te s"ts5Te e""e-t is 3ro3ortionte 6it s"t imeter5


29/68

Instlltion Tor8$e Correltions

$lt J +tT

ere.

$lt J Ultimte C3-it in Tension or Com3ression Ml# N?

+t J C3-it to Tor8$e Rtio M"t1 m1?

T3i-l Vl$e J 10 @@? "or 15H> 157H> S8$re S"t

T3i-l Vl$e J 9 @0? "or 257H> OD Ro$n S"t T3i-l Vl$e J 2? "or @> OD Ro$n S"t T3i-l Vl$e J 7 2@? "or @5H> OD Ro$n S"t

T J Finl Instlltion Tor8$e M"tl# Nm?

The Torque Required to Install a HelicalFoundation or Anchor is Empirically and

Theoretically Related to Ultimate Capacity.

Teor Desi4n


30/68

Instlltion Tor8$e s5 Ultimte C3-itInstlltion Tor8$e s5 Ultimte C3-it

+t is not -onstnt m rn4e "rom @ to 20 "t5*1 10 to m*1?5 De3ens on rio$s "-torsin-l$in4. S#+ C#nd+*+#n &nd P'+#' E./!'+!n! &* S+*!

Normll -onsolite -l – +t J 10

Oer-onsolite -l – +t J 121 Sensitie -l – +t 10

Sns – +t J 12K

C!n*'& S*!! S(&)*H!+. S+! +t inersel 3ro3ortionl to s"t si


31/68

Reli#ilit o" Tor8$e/C3-it ,oel

U3li"t C3-it o" (eli-l An-ors in Soil (ot Clemen-e 199? Anl


32/68

F-tor o" S"et

Sele-t n 33ro3rite F-tor o" S"et FS? to #e33lie to te Ultimte C3-it o" te

n-or/"o$ntion to eelo3 esi4n! or orin4

C3-it 3er n-or/"o$ntion5

In 4enerl! it is re-ommene to $se minim$m

FS J2505

For eli-l n-or 3roBe-ts 6ere si4ni"i-nt

"r-tion or ll n-ors re 3roo" teste FSJ15H is

-ommon5

Teor Desi4n


33/68

Slenerness Rtio/&$-lin4

Reser- so6s elsti- #$-lin4 is 3r-ti-l -on-ern onlin te so"test soils5 Soil 3roies lterl s$33ort to s"t5

%r-ti-l :$ieline. Soil 6it AST, D1H #lo6 -o$nt o"

or less5 Ver so"t so"t -ls

Ver loose sns

Com3$ter 3ro4rms il#le "or nlsis )%I)E ENSOFT5 A$stin! TP?

Finite Element So"t6re ANS'SQ

Teor Desi4n


34/68

S-re6 An-or/Fo$ntion S3-in4

D

D or "t5

Re-ommene

@ "t5 ,inim$m

D or "t5

Re-ommene

@ "t5 ,inim$m

φ

Teor Desi4n

T D i


35/68

Enlr4e S"t

Se-tion&enin4 ,oment

Distri#$tion in %ile

)terl )o C3-it

Anlsis ,etos.

15 &roms

25 Finite Di""eren-e )%I)E?

@5 Finite Element

Teor Desi4n

T D i


36/68

%ssie Ert

%ress$re Resistn-e

:re &em %ile C3

O3tionl )terl Tie#-

)terl )o

C3-it

Teor Desi4n

T D i


37/68

&ttere

%iles

%ile C3

)terl )o

C3-it

Teor Desi4n

T D i


38/68

Corrosion

= Te t ini-te tt $nist$r#e soils re soe"i-ient in o;4en t leels "e6 "eet #elo64ro$n line or #elo6 te 6ter t#le


39/68

Corrosion

For 3ermnent str$-t$res! -orrosion m #e--o$nte "or B$stin4 s"t se-tion 3ro3erties #te s-ri"i-il ti-ness 3er ICCES AC@H5

AC@H Se-tion @59 Te ti-ness o" e-

-om3onent sll #e re$-e # Ts on e- sie"or net re$-tion in ti-ness o" Ts5

T J TnTs6ere Tn is nominl ti-ness n Ts is s-ri"i-ilti-ness tJH0 rs?5

in--ote steel. Ts J 2Ht05H J 0501@ in

&re steel. Ts J 0t050 J 050@ in

%o6er -ote steel. TsJ0t1?050 J 0502 in

Teor Desi4n

Teor Desi4n


40/68

,oel S3e-i"i-tion Re8$irementsF-tors tt ""e-t te 3ro3er 3er"ormn-e o" eli-l 3iles n eli-l n-ors5

%ro3er si


41/68

T3es o" S3e-i"i-tions

O3en S3e-i"i-tions Contr-tor s sole res3onsi#ilit "or te s-o3e! esi4n! -onstr$-tion!-3-it! n 3er"ormn-e o" te n-or/"o$ntion

%er"ormn-e S3e-i"i-tions Contr-tor s te res3onsi#ilit "or -ertin esi4n n/or -onstr$-tion

3ro-e$res

Testin4 or oter m$t$ll 4ree $3on --e3tn-e -riteri i5e5 instlltiontor8$e? re re8$ire to emonstrte n-or/"o$ntion lo -3-it toO6ner5

Contr-tor n O6ner sre res3onsi#ilit "or te 6or ,ost -ommon s3e-i"i-tion $se

%res-ri3tie ,ens ,eto? S3e-i"i-tions O6ner s sole res3onsi#ilit "or s-o3e! esi4n! instlltion 3ro-e$res n

3ro3er 3er"ormn-e o" te n-or/"o$ntion Contr-tor is res3onsi#le "or "$l"illin4 re8$irements s s3e-i"ie in te

-onstr$-tion o-$ments

Teor Desi4n


42/68

A33li-tion


43/68

E;-tion Sorin4

A33li-tion

A33li-tion


44/68

Ert Retention

A33li-tion

A33li-tion


45/68

Ele-tri- Trnsmission Str$-t$res A33li-tion

A33li-tion


46/68

To6er :$ An-ors A33li-tion

A33li-tion


47/68

%i3eline &$on- Control33

A33li-tion


48/68

Floor Sl#s33

A33li-tion


49/68

Resientil Fo$ntions33

A33li-tion


50/68

Commer-il Fo$ntions33

A33li-tion


51/68

l6s "or etlns

A33li-tion


52/68

Nt$re ls

A33li-tion


53/68

Resientil Aitions

A33li-tion


54/68

De-s :


55/68

Uner3innin4

A33li-tion


56/68

Uner4ro$n Str$-t$res

A33li-tion


57/68

Oter A33li-tionsSignage Elec Util Government Industrial Soil Control

Awnings/Canopies Elec Trans Guys Airports Equipment Fdn Agriculture

utdoor Advertising Elec Trans Fdn !ridges "ines Erosion Control

Sound #alls Su$station Fdn %U& %ousing 'uclear/C(em Sites Slope )etention

)oadway #ind Generators Flagpole Aquaculture

"ilitary Commercial

Amusement "arine *ar+s Commercial Structure "iscellaneous

*ar+s !ul+(eads "etro )ail Constr Equip Fdns !urial ,aults

At(letic Fields "oorings 'ative Amer )eserv Elevator *its -oad Test Anc(ors

Circus "arine Constr )ailroad *ar+ing -ots -ogging

Gol. )ural )oadway/&T *reEngr "etal !uildings Seismic Areas

Stadiums TE-C" Tunnel Approac( Tie$ac+s Specialty -ig(ting

oos Call !o0 Ur$an )oadway

Cell Towers #aste #ater Facilities )esidential

Cell Twr Site Equip Fdn )esidential Fdn 1 #alls

Tie$ac+s

il

il.ield

*ipeline


58/68

Cse (istor

Cse (istor


59/68

%r-ti-l Desi4n A33li-tion

For FielDetroit )ionsG Ne6 Sti$m

Cse (istor


60/68

%ln Vie6

Cse (istor


61/68

Desi4n %ro"ile

Cse (istor


62/68

Desi4n Cross Se-tion


63/68


64/68

Contin$e

St$

Contin$e St$


65/68

In$str Or4ni


66/68

Tre So6s / Seminrs

&$ilers Orlno! F)

orl o" Con-rete )s Ve4s! NV

Ntionl Asso-ition o" To6er Ere-tors Dlls! TP

To6er So6 Ne6 Orlens! )A

Con E;3o )s Ve4s! NV

)i4t So6

Contin$e St$


67/68

&oos

(o6r A5 %ero! Helical Piles: A Practical Guide to

Design and Installation! ile! Ne6 'or

Donl %5 C$$to! Foundation Design Principlesand Practices

:$l- ilson! =Te &erin4 C3-it o" S-re6

%iles n S-re6-rete Cliners>

Romno""! National Bureau of Standards Monograph

12


68/68

Con-l$sion(eli-l Fo$ntions An-ors re

Vl$#le Fo$ntion Tool

DFI Dis-limer.

Tis 3resenttion is intene s n intro$-tion to eli-l3iles n eli-l n-ors5 It is neiter intene to #e

-om3reensie or e;$stie5 Te 4ol o" te 3resenttion

is to -om3lement $ner4r$te or 4r$te -o$rse6or in

te st$ o" ee3 "o$ntion n n-or #eior5 (eli-l

3iles n eli-l n-ors re s$#Be-t to mn o" te sme

limittions s oter t3es o" "o$ntion n n-orin4sstems5 Tere is no one sol$tion "or eer 4ro$n

-onition5 %rior to em#rin4 on te esi4n o" eli-l

"o$ntion sstems! te st$ent is ise to see "$rter

st$ in te 3ro3er esi4n! instlltion! n 33li-tion o"

d.f.i. helical presentation 7.ppt

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