tm 5-274 portable steel highway bridges h-10 and h-20, 1943
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7/30/2019 Tm 5-274 PORTABLE STEEL HIGHWAY BRIDGES H-10 AND H-20, 1943
1/54
Y
Publ
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ARDEPARTMENT,
25,D.C., 18June1943.
AYBRIDGESH-10ANDH-20
highwaybridgeH-10.
__________ 1-6
t___________________ 714
----------------------15-16
oadingofequipment__ 17-18
party______________ 19
_____________________ 20-25
ge____________________ 26-27
ge maintenance_______ 28-29
_____________________ 30-32
pment_______________ 33-36
highwaybridgeH-20.
__________ 37-42
t___________________ 43-51
______________________ 52
oadingofequipment___ 5354
party______________ 55
_____________________ 5664
ge____________________ 65
ge maintenance_______ 66
_____________________ 67-68
pment_______________ 69
wtouse tablesIandIV __________ 53
AYBRIDGEH-10
__________ 1-6
t______________ ._____________________ 7-14
_______________ _'__________________ _ 15-Ki
oadingofequipment_________________ 17-18
party______________________________ 19
_______________ 20-25
ge________________ 26-27
ge maintenance___ :__________________ 28-29
__________ _______________________________ 30-32
pment______________________________ 33-30
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red4
5
entofequipment6
eH-10portablesteelhighwaybridge
ergapsnotwiderthan 96feet.Itis used
erbridgeis tooslowandbuildinga floating
eefig.1.)
Thebridgeis atimberdeckontwo
ssesofhigh-gradesteel.Trussesconsistof
tionsboltedtogetheratthebridgesite
antileveredintopositionon rollerswith
e.Clearwidthoftheroadway(fig.4) is
singportablesteelhighwaybridge11-10.
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YBRIDGESH-10AKDH-20
LAMPr-SIDERAIL
IOERAIL^SIDERAILCLAMP
tionofportablesteelhighwaybridge.
ssgap.
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Normallythebridgeisbuilt withtwo
entertocenter.Capacityisincreasedbyadding
nthesetwo.TableI givespostedcapacities
forcedbridgesforvariousspans.Italso
lemaycross.
Postedcapacities(valuesatwhichthe
)areshownat thetopoftableI. For
ithtwotrussesovera spanof60feetis
idgeshowingclearancebetweensiderails.
s.Iftheweightof thevehicleintonsis
dcapacityofthe bridge,vehiclemaycross
htisgreater thanthebridge'sposted
seeifthevehiclemaycross.If thetableis
ybe permittedtocrosswithcautionifits
5percentabovebridgecapacity(cautionis
example,ifa bridgeispostedat 18tons,
maycrosssafelyandvehiclesfrom18to 23
n.
herornot avehiclecancrossabridge
posted).LookattableI. Therearethree
esmaycrossatspeedsup to25milesper
eenvehiclesshouldbe80feet.
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YBRIDGESH-10ANDH-203
aution.Vehiclesmiiststayonthe
nevehicleat atimemaycross,withno
a maximumspeedof5milesperhour.
bridgemayfailif thevehicleiscrossed,
dgewillbegreaterthan isconsideredsafein
e.Vehiclesshownasunsafe~bythetables
xtremeemergencies.
yofportablesteelhiffhwaybridgeH-10(Tentative
subjecttorevisionbyfurthertests).
ow
ow.
10TONS
)11
-
A2
Ml
me
gun.
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hevehicletobe crossedisnotlistedin the
esttoit ingrossweightandaxlespacingor
uired.Normallyoneengineer
tructtheportablesteel highwaybridgeH-10
on."Withexperiencedpersonnela
anbeconstructedinabout1%hours inday-
atnight,providedno unusualdifficultiesare
ationofabutmentsandapproaches.Inex-
reabouttwiceaslong.
mentofequipment.a.Bridge
theequipment,enoughfor72feet oftwo-
eparts shownintableII.
entforoneunitofportablesteel highwaybridgeH10
for1-in.manilarope4
for1-in.manilarope2
quipment:
ction,\%in.x 21in118
il,H-10,14-in.jaw64
20
andM-316
te,H-108
/lever.2
500
0
n,15-degreeangle,1%-in.hexagonalnut2
eratchet,1%-in.hexagonalnut,18-in.handle-12
mallyavailablefromothersources
bridge:
Continued.Number
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AYBRIDGESH-10AK'DH-20
sstoredinappropriatedepotsin the
sincludedin depotstocklistsofconstruc-
ssuedfortrainingpurposes.
ENT
7
on.Eachintermediatetrusssection
ape,measures2by4by 12feet,andweighs
reversible,end-for-endandtop-for-bot-
d,outsideandinsideeachcorner,through
epar.9) areinserted.Ateachcorner of
arshearlugora lug_recess(fig.6);when
ereachlug fitsintoalug recessoftheadja-
ashearlockunderload.Clips forcarrying
nnotin useareprovidedoninteriorfaces
trusssection.
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ubularsteelcarryingrods areweldedout-
paralleltothe longaxisofthe section.
UO
GS-
ationofintermediatetrusssection.
hend,ortriangular,truss sectionis
the endtobeattachedto theintermediate
nchesatthe abutmentend(figs.1and8).
unds.Thelowersurfaceof theabutment
ll ofthebankseat,measures2feet by1
tthebridgeend ofthesectionareidentical
atesections.Two1%6-inchholesin the
ord receivethepinsthatsecure thearmof
section.Theendsection,liketheinterme-
bracketsforits sixconnectingbolts.
onnectingboltsarel^-inchbolts,21
steel.The boltheadissquareand cannot
(fig.9);hencethehexagonalnutmaybe
ctionroller.Theerectionroller(fig.
eassembledtrusses.Therollerproperis
esindiameterand 3feetlong.Thespindles
sattachedtoa woodenbase.Ropelashings
ofacilitatehandling..
certainsituationstoplacethetrusses
ployedindismantlingthebridge.It isa
typegenerallyusedforriggingand
handmaybeextendedan additional3
isinsertedonthetop. Ithasa liftingrange
of12tons.
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YBRIDGESH-10AK'DH-2010-13
ocketwrench(fig.10)is ofthereversible
xagonalnutsof theconnectingbolts.
wrenchalsofitstheconnectingboltnuts.
eof15 withitshandle.It isemployedin
touse thesocketwrench.
ks.Theseare8-inchsteelblocksofthe
ging.
and1-inchthree-strandropeis provided
guy lines.
acilitatelaunchingandplacingthe
entincludestwolaunchingnoses.Eachis a
over-alllength.Theouterend orfrontof
wheels,each2feetin diameter.Theother
e twohorizontal1%-inchpinsbywhichthe
sionofthe endtrusssection.Tosimplify
chingnosebeamismadein twosections;
emblybyfourvertical1%-inchpinslocked
leteunitweighs1,076pounds(fig.11).
erpartsareofhighquality(fig.12).
y12inchesby12 feet.
nchesby12 feet.
esby12 feet.
siderailclamps,usedtoholdthedeck-
hapedscrewclamps.Thelowerjawofthe
nderthe trussangle(fig.13).
on(upsidedown).
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U6
RSHEARLUGS^ENDELEVATION
ationofendtrusssection.
tbeingtightened.
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YBRIDGESH-10ANDH-2013
atchetwrench.
se,dismantled.
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s.
p.
mp.
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YBRIDGESH-10AKDH-2014-15
chrampis.abuilt-upsteelsection12
figs.14and15).The webdepthtapersto
attachedtothebridge proper,andto3inches
ttachedtotheendtruss ofthebridgesec-
reespecialclampcatchesweldedtoeach
ints ofattachmentforthelowerjawsof
OOK-i3"x12"DECKPLANK-
on,:uiderectionprocedureofabutmentrump.
TE
heportablesteelbridgeislimitedto
hefollowingsiteconditionsaredesirable:
mitytoroadthat permitshaulingbridge
minimumofpreparation.
approximatelyequalheights.
oughto permituseoflaunchingnose,
erectionoftemporaryramptoreceivewheels
feetwideand 150feetlongandof fairly
ntonnearshore,to permitassemblyof
theirfinalpositions.Approachroadwill
paredbeforehandoralreadyexists.
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nd tackletofarbank,unlesscrossing
assaultboatorareconnaissanceboatserves
ybefelledacrossthestream.
a streamisbeingcrossed,topermit
nterferencefromswiftcurrentsorsoft
enatureofthebanksinfluencesthe
ndtruss sectionsattheabutments.Where
ble andthespanis sufficientlyshort,the
edto advantage.Evenso,itusuallyex-
htheend sectionstothefarends ofthe
ingnosesmaybeused.Theendsections are
sseshavebeenhauledacross.
NLOADINGOFEQUIPMENT
-footunitofbridgeisnormallytrans-
otrucks or2y2-tondumptrucksasshownin
ngofbridgeequipmenton8l,iton trucks
_ .
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AYBRIDGESH-10AKDH-2017-19
ngofbridgeequipmenton2%-tontruck*.Continued.
6
te_ -_ -
toolsshouldbeunloadedfirst.Tore-
),thetrusssections shouldbeunloadedas
nalassemblypositions.Sectionsmaybe
ckbyraising thetruckbedwhichwill allow
ndout asthetruckmovesahead.
beunloadedascloseas trusssectionsto
s.Allpartsshould beunloadedandpiled
etotheworkingparty,butwith aclear
ndlaunchingthe trusses.Deckplanksand
asnear theabutmentaspossible.Deck
adeduntildeck layingistostart;the trucks
ear endofthebridgeand theplanks
KINGPARTY
rty19
gparty.a.Constructionofthe
mandofanofficerwhosupervisesall
stitutedas follows:carryingdetail,a
and16men;boltingdetail,anoncommis-
and abutmentdetail,anoncommissioned
ng detailisdividedintofour crews:
doneoftwomen.Thefour-mancrews
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ERS
ectingbolts,whilethetwo-mancrewremoves
gclips.
een placedacrossthegap,thecarrying
signedto carryandlaydeckingandside-
abovedoesnotprovidefor construction
afficcontrolandsecurity.Additionalmen
tasks iftheyarecarriedonsimultaneously.
workingpartyas outlinedaboveisthe
nanemergency,thebridgemaybeerected
missionedofficerand16men.
rdinarilyassignedtoconstructthe
almencanbeusedeffectivelyifavailable.
scanconstructtwotrussessimultaneously.
GE
21
4
ails25
a.Thetrusssectionsareeasilyassem-
tting thesectionstogetherandbolting
eis slightlyirregular,twosectionsmaybe
ecarryingdetail whileoneofthebolting
nstogether.Ifthe groundisveryuneven,
dtochockthesectionsinto alinement.
partarebolted first.
shouldordinarilybe performedinthe
rstend sectionabout25feetfrom
rstintermediatesectioninproper
he twosectionstogether(fig.19).
carriedout,carryingdetailplacessec-
ensecuressecondintermediatesection
slaunchingnosetoendsection(figs.
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YBRIDGESH-10AK'DH-2020
d beneathfirstintermediatesection.
nonfrontend oflaunchingnose,raisingin-
ercanbeplacedbeneath(fig.22).
hirdintermediatesection.
third intermediatesectiontosecond.
eerectedinthesame manner(fig.23).
tingcrewoftwomenhasbeen removing
sectionframesandgiving themtoother
hiscrewhasalso placedsafetypinsbehind
eendrawntightlytogether.
placeddirectlybehindandparallelto
Anotherroller isplacedparalleltothe
ermediatesection(see&(7)above),anda
eenthem,itsexactlocationdependingupon
oftground,itisadvisableto useafourth
the onebeneaththefirstintermediate
the twotrussesareassembledsimultane-
ingplacedalternately.Thismakesitpos-
sto worksimultaneouslyandthusspeeds
bolting.
dingoftruckNo.1.
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ssembledsothatwhencompletedtheymay
ard.
nts.a.Whilethetrussesarebeing
detailestablishesthecenterlineforthe bridge,
essary(fig.25),placesthe sills,reevesand
paresholdfastson bothbanksforusein
nfirmsoil,standard6- by8-inchsillswill
e.However,withunstableorsoftbanks,it
onabroaderbaseof planks2or3 inches
ngths,andlaidasfootingsperpendicularto
nt,thesills shouldbeanchoredbystakes
nds(fig.27),andearthor othermaterial
hem(fig.28).
re exactly12feetlong,thedistancebe-
ultiple of12feet,less2 feet(fig.29).This
heabutmentend oftheendsectionsfull
rn oftheendsectionmeasures1foot in
ofthe sillis8 inches,thetrussshouldbe
llowanoverhangof 4inchesbehindtheedge
nk.Noattemptshouldbemadeto decrease
he endsectiontoprojectbeyondtheabut-
ngoftruckNo.2.
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YBRIDGESH-10AK'DH-2021
edistancementionedabove,forthenthetruss
hesillandtends tocreepunderalive load.
dneverbesoplacedthatthe edgeofthe
dof thetruss.
esectionbeingunloadedfromtruck.
rmediatesectionsbeingboltedtogether.
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oflaunchingnosebeingattachedtoendsection.
noflaunchingnosebeingattachedtorearsection.
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YBRIDGESH-10ANDH-2021
erbeiuginsertedbenentutruss.
oftrussbeingbolted.
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erinplacebehindabutmentsill.
nbankforabutmentsill.
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YBRIDGESH-10ANDH-2021
traeutsillon lootings.
lbeingsecuredinplace.
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utmeiitsill.
vveenabutmentsillsbeingchecked.
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YBRIDGESH-10AKDH-2021-22
nksare notatthesameelevation,the
gitudinally;theabutmentdetailshould
rectlytothe sillsortostakes ornatural
ntcreeping.Thepositionsof thetrusses
kedfrequently,topreventanyfromslip-
erend.
ssaryto erectthebridgewithoneend
of thetwotrussesmustalwaysbein the
ndlevellaterally.Thereforetheabutment
llstomakecertainthat theyarelevel
gs.30,31,and 32).a.Withend
e. (1)Thetrussis pushedoutonerection
20menworkingalongsidetherearend.
ted inparagraph20c.Thefirstroller,
esill onthenearbankandsomewhatabove
theendof thetrussintoits seat.Theend
roller withoutdifficulty,ifthebankbelow
forthe dropofthetruss.A snatchblock
arendofthe trusstoa holdfast;theline
ytwomenoftheabutmentdetail (fig.33).
forwardat aconstantspeedandnot
unchingnosehasrolledupthe farbank
rbankisnot toosteep,thetrussis pushed
nearbank;otherwise,thefar-bankabutment
eattachedtotheringsonthe launching
enthefarendof thetrussisaboveits
mentsill,thenear endshouldberesting
endisonly2 or3inchesaboveits sill,
nto placebyremovingthepinsconnecting
rop isgreater,thetrussis loweredwith
hsmallblocksandtheblocksknockedout
d.Whentheendsectionfalls onthesill
aunchingnosereston alowerlevelthan
aisedtodisengagethe launchingnose.This
draulicjackorbypryingunderthetruss
Smalladjustmentsof thetrussonthe
h pinchbars.Wheretheerectionrollers
it ispossiblethatthetruss maytopple
reattachedtobothsidesof thetrussat
dfastsonthefar bank.
safetyandefficienterectionprocedure
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russes.
pushedoutonerectionrollers.
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YBRIDGESH-10ANDH-2022
ol.
ght.
ar.
.launchingnose. (1)Whenthetrusses
ndsectionsandlaunchingnose,a second
eddirectlybehindthefirst andtemporarily
uss isthenrolledinto position,usingthe
enas acounterweight.Withthefirsttruss
thesecondisunboltedfromit.With two
k,the secondtrussisloweredintoplace.
maybehauleddirectlyintoplaceby
chbank.
ensavedbytemporarilyattachingan
nosetothe farendsoftrusseswhenthey
dsections.
houtlaunchingnose.Occasionallyicris
aunchthetrusseswithoutthe launching
sectionsareto beused.Undersuchcircum-
nchedandplacedwiththe aidofagin pole
erpossible,poweredmechanicalequip-
dformanhandlinginorder tosavebothtime
acethetrussesacrossa streamwhere
konthenear sideandaverticalor steep
klemustberiggedonthefar banktolift
tvertically.Sometimesitisevendesirable
temporarilytothe nearendofthetruss to
ectandpartlycounterbalancetheweight
kroller.
eoustoplaceafewdeckplanksonthe
intheformofa rampandtrackon
wheelsmayroll(fig.38).
capacitymaybeimprovisedfrom
gtreeora trestlepostwithchainhoist
aybeused.
ssembledsuccessively,theentirebolting
yingdetail,isavailabletomovethetruss
otofourmen shouldmanagetherollersand
hesnubbingl inesholdingthetrusserect.
edbetweenthetwobanks,paysoutthe
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ngfarbank.
nubline.
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YBRIDGESH-10AX'DH-2023
ockandtackleconnectedtolaunchingnose.
selieiughauledupon afarbank.
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ERS
elaunchingnose intoplaceonthefar
sembledconcurrently,thefirsttrusscon-
ecarryingdetailand twoboltingcrews
boltingdetail completestheassemblyof
acingbetweentrusses isthatafforded
desirabletousetheend sections(whichplace
hords10inchesabovethesillinsteadof 4
ducesideswayundermovingloads.Also,
uallyfacilitatespreparationofthe
rthetrusseshavebeenplacedonthe
so thattheendsectionsareexactlyper-
tsills.Thetrussesare thenmeasuredto
feet8inchesapart,centertocenter,and
ealined.
ps.Assoonasthemaintrussesare
psareplacedbythe abutmentcrews(fig.
krampmaybe delayeduntilthebridge
tpoint.Insoftsoil, improvisedsillsmay
dendsof theramps.
derails.Whenthenear-bankabut-
ced,thedeckingislaid.Deckplanks should
ttoallowspaceforsiderail clampstobe
n,thecarryingdetailbecomesaplank-
fig.40),and theboltingdetailplaces
withclamps(figs.41 and42).Theabut-
eparesroad-to-bridgeconnectionsatboth
restackleforloading.Thebridge isthen
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YBRIDGESH-10ANDH-2025
inplaceonabutmentsill.
ssectioninordertodisengagelaunchingnose.
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usedasrampforreceptionoflaunchingnose.
mentrampbeingplaced.
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YBRIDGESH-10AK'DH-2025
planks.
derails.
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on.
bridge.
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YBRIDGESH-10ANDH-2026-29
GE
naltrusses26
ediatesupports27
itionaltrusses.Thebridgemaybe
ditionaltrussesplacedbetweentheoriginal
beleveledandsquaredtoplacethe addi-
plane asthefirsttwo;this isnecessaryso
distributedover thedeckplanks.Forthe
cedbyextratrusses,seetableI.
rmediatesupports.Inanemer-
einforcedbyintermediatesupports.De-
tionofsoil directlyunderthespan,stream
ussesabovethefoundation,anyofthe
used:timbertrestlebents,pile bents,
ndardtrestlesfromtheequipageof 10-and
esupportmustbeplaceddirectlybelow
ctions,andnever beneaththemiddleofan
henintermediatesupportsareused,the
bovethesupport,whichareintension,
RIDGEMAINTENANCE
covertheH-10bridgemustbeclosely
omptpassageof importanttacticalvehicles,
hoseweightexceedsthecapacityofthebridge,
spacingofvehicles,toprovidefortwo-way
geandto takeanyothermeasuresnecessary
iclesandtopreventdamageto thebridge.
rafficcontrolseeFM5-10.
Abridgeguardshouldbeinconstant
Thedutiesofthe bridgeguardareto
ht.
ght.
sliponabutmentsills.
ches.
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37/54
ERS
E
ngeneral,thebridgeisdismantledby
efollowedinerection.Siderailclamps,side-
ovedfirst,followedbytheabutmentramps.
onthenearbankmust beraisedafewinches
allowinsertion oftheroller.Onemaydo
draulicjackorbyinvertingtheabutment
hooksbeneaththeendsection,andemploying
ttermethodis thequicker.Theendsec-
raisedand thelaunchingnoseattached
ussis placedonaroller,twoother rollers
neatabout15-footintervals,andtheentire
ebankwith a1-inchropepulledbya truck
thegroundonthebankis softatruck
vantageously.
Thetrussisdismantledbyrevers-
y.Theboltsthat areincompressionare
gboltsshouldbesecuredintheirrespective
onsareseparated.Allpartsoftheequipment
ksby hand;however,mechanicalmeans
yed,ifavailable.
retheterrainon thenearbankis
nydanger ofthetrusstopplinginto thera-
a steepbankonthefarshore, sideguylines
cularcareshouldbetakenthatguylines led
hefarshoredonot tightenup.Otherwise
lyandwillcausethetruss tooverturnasit
ruckwinch.
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38/54
YBRIDGESH-10ANDH-2032
sbymeansofaninvertedrampin preparationfordismantling.
auledoutbytruck.
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39/54
ERS
QUIPMENT
t.Thesteelelementsofthebridge
construction,butmustneverthelessbehan-
oadingthe trusssectionsfromtrucks,care
emfrom strikingagainsthardobjects.The
areallheavyandare noteasilydamaged.
blocks,wrenches,andjacksareessentially
edandused assuch.
lstructuralsteelpartsaregiven two
thepriming coatbeingred-leadrust-pre-
ond,olive-draboilpaint.This covering
tectagainstrust.The olive-drabpaint
vernecessary;andanylossofpaintthat
ecorrectedatonceby theapplicationofa
tandasecondcoatofolivedrab.
Paintonthetimber partsofthe
whennecessary.Issueolive-drabpaintis
esandotherdamagedpartsare replaced.
orage,trusssectionsmaybestackedin
edthelowermostsectionisplacedupona
s properlychockedup.Lumberparts
dinsuchawayasto preventwarpingand
fairthroughoutthe stacks.Covered
bsolutelynecessary,shouldbeprovidedwhen-
oorstorageofthebridgeparts cannotbe
houldbecoveredbyheavycanvastarpaulins,
fromtimetotime toallowforsunningand
oragefor anyappreciableperiod,all
becleanedandinspected.Allmetalnot
hreadsandthe machinedpartsoftools)
in filmofoilor grease,andpaintedsurfaces
touchedup orrepainted.
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40/54
AYBRIDGESH-10ANDH-2037-38
AYBRIDGEH-20
42
t43-51
52
oadingofequipment53-54
party55
6-64
ge65
ge maintenance66
7-68
pment69
red40
41
entofequipment42
esteelhighwaybridgeH-20provides
ossing forheavierloadsthancanbe carried
aybridgeH-10,or forspanninglonger
by theH-10bridge.
edesignoftheH-20bridge issim-
ge(par.2) exceptforminorchangesneces-
ction.
nstructed inmultiplesof121/2feetup
5 feet.Clearwidthoftheroadwayis10
heedgesoftheflooring,which isbolted
beneaththetop chordmemberofthe
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41/54
videdwith thisbridge;becauseofits
renecessarytoerectthetrusses.
ythebridgeisconstructedwithtwo
hesapart,center-to-center.Capacityis
rtwotrusses betweenthenormallyspaced
pacitiesofthe normalandreinforced
Thistablealso showswhetherornot
s.
pleof howtousethistable.
quired.Normallyonereinforced
edtobuild theportablesteelhighwaybridge
AI
vationofportablesteelhighwaybridge.
tion.Withexperiencedpersonnel,a
canbebuiltin about3hoursin daylight
ht,providednounusualdifficultiesare met
dapproaches,andthatmechanicalequip-
on(seepar.57)is available.Inexperienced
wiceaslong.
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42/54
YBRIDGESH-10ANDH-20
tyofportablesteelhighwaybridgeH-20(Tentative
subjecttorevisionbyfurthertests)
How
How
ns
)
-
w.,
r.
e
A2
Ml
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43/54
nmentofequipment.a.Bridge
equipment,enoughfor125feetoftwo-truss
s shownintableV.
ntforoneunit ofportablesteelhighwaybridgeH-%0
n__8
,for1-in.manilarope4
,for%-in.wirerope5
,2-in.thread,w/nutandwasher54
,3-in.thread,w/nutandwasher108
quipment:
ction,1%by25J4in176
210
36
te,H-2016
8
ctions1
pletew/pin2
d,%-in92
ever2
0
n.,galvanized,6x19(ft.) 1,000
8-ft12
n.(Ib.)100
und,%-in.(Ib.)25
,15 angle,%-in.squarenut12
,15 angle,l^-in.hexagonalnut4
eratchet,%-m.squarenut..8
eratchet,lJ4-hi.hexagonalnut12
sstoredinappropriateengineersupply
perations,andisincludedindepotstock lists
t.
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44/54
YBRIDGESH-10ANDH-2043-44
ENT
43
tion.Anintermediatetrusssection
by12feet6 inchesover-all,andweighs1,730
ectedduringassemblyofthetrussesasin
ngbolts,bolt-carryingclips,semicircular
esare insimilarpositions.Thesectionsare
dtop-for-bottom.Eachpanelofthe section
s;inthelight bridge,eachpanelhasbutone.
endtrusssection(fig.48) is12feet
tthe endtobeattachedto theintermediate
ootattheabutmentend.Thelowersurface
hrestsuponthe sill,measures2feetby 1
weighs1,235pounds.Thesectionsare
blyofthetrussesasinthe H-10bridge.
G
RSHEARLUGS^ENQELEVAT10N
vationofIntermediatesection.
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45/54
econnectingboltsarespecial1%-inch
hsquareheadsand hexagonalnuts.The
the nuts,2y2pounds.
G
atimiofendwction.
on,anderectionprocedureofabutmentplan.
ard%-inchcarriagebolts,12inches
ches,securetheguardrailstothe deck
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46/54
YBRIDGESH-10ANDH-2047-51
Standard34-inchcarriagebolts,16
or3 inches,securethedeckplankstothe
ampingbeamconsistsoftwo3-inch
cheslong,spacedbackto backby3spacing
els.Twobeamsarepassedtransverselyun-
htrusssectionandabutmentrampandare
by meansofclamping-beambolts.The
erampisofthesamedimensionsand
nthe H-10bridgewithtwoprincipalex-
atchesareeliminatedbecausesiderailclamps
eeramphooks,insteadof two,areprovided
russ section(fig.49).
eerectionrollerissimilarto thatused
or slightlyheavierconstruction.
s exactlythesameasthatusedin
lethetrusssectionsbycraneconsistof
part.Inthe topofeachhookisa drilled
edringfits, andthebottomofeachhook
sectionsmaybereadilyengaged.The
movingblockon thecranecables.Each
pounds.
enttotheforwardendsectionandis used
truss. Itisan A-shapedweldedsteel
nchsteelrods.It is2feet high,measures
egsofthe assembly,andisdesignedsothatit
ofatruss section.Neartheendsofthe
chthe yokepinfits.Toattachtheyoketo
insertedthroughtheholesprovidedforit
lumberpartsareof thesamemate-
dgeandhavethe followingdimensions:
0inchesby11feetand weighsabout130
esby12 feet6inchesandweighabout100
12inchesby12feetand weighabout300
esby4 feetandweighabout100pounds.
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47/54
E
Ingeneral,siterequirementsfor
measfortheH-10.However,becauseof
cessarytounloadthesectionsandto launch
rgerworkingspaceis requiredfortheH-20
n paragraph15.Also,levelgroundismore
becausethegreaterweightofthe,truss sec-
yin buttingandboltingthesectionstogether.
NLOADINGOFEQUIPMENT
oughtablesfordistributionofthe
shavenotbeencompiled,it canbetrans-
ucks.Itis alsofeasibletotransportthis
onsemitrailers,whensuchvehiclesare
1X1BB ffl((!)'
LE
andassemblingtrusssection.
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48/54
YBRIDGESH-10ANDH-2054-55
lpartsofequipmentareunloadedby
funloadingthesectionsis madepartof
s.Thetruckcraneis placedabout100feet
fterthetongs areattachedtothecrane
edupinthe immediatevicinity.Thesec-
etrucksand placedonpreviouslyposi-
epar.58).Eachsectionis buttedtotheun-
andbolted on(fig.50).Asthe trusssec-
hecompletedportionis-movedriverwardand
rogressesuntiltheentiretruss iscompleted.
NGPAKTY
arty55
gparty.a.Constructionofthe
andoftwoofficers,oneofwhomsupervises
etail,whilethe othersupervisestheremain-
s constitutedasfollows:
pressoroperators4
inplace,theentire workingpartyisre-
aceandsecuresiderails,andplaceand
workingpartyof sixnoncommissioned
nedaboveis themostefficient.However,
tivelybeemployed.Normally,areinforced
edtoerectthebridge.
uggestedabovedoesnotprovideforcon-
es,orfortrafficcontrolandsecurity.Addi-
edto thesetasksifperformedconcurrently.
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49/54
ERS
GE
0
ail- 61
3
andclampingbeams64
theirweight,thesectionsshouldbeun-
bly,andlaunchedbymechanicalmeans.The
bleitemsofequipmentshouldbeused:
nload sections.Mayalsobeusedto
gsectionsintoplacesothattheycanbe bolted
idin launchingtrusses.
ontrucksortractors,alsoto aidinlaunch-
ngline,suppliesthe powernecessaryto
span;thesecond,thebackline,isused for
mallerthan%-inchmustbe used.
umaticdrillattachment,todrillholes
sthroughwhichclamping-beamboltsand
dsecured.
Theproperalinementofthetrussis
terline.The.truss thendropsapproxi-
ar abutmentbutmustbejackedoverfrom
depositiononthefarabutment.Tostart
rmediatesectionisplacedon apairofrollers.
n frontofthisandis buttedandboltedtoit;
ensionboltsarefirst tighteneddown.Sub-
tionsareunloadedandboltedtotheincom-
hetrussis underconstruction,itisrolled
nunevengroundwhereitis impossible
thetrussonall therollers,itmaybe neces-
hetrussuntil thesectionsarebuttedand
assemblingstarts,therollerdetail
rane;the threeremainingrollersareplaced
elto andnearertheabutmentsill.Each
llofthemshouldbe placedatthesameele-
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50/54
AYBRIDGESH-10ANDH-2058-62
psmaintainthe alignmentofthetruss
assemblypoint.Likewiseitattachesthe
ardendsection.
etailisdividedintothree crewsoffour
lowingduties:onecrewloosensandre-
clipsontruss sections;thesecondcrew
eboltswhilesectionsare atassemblypoint;
d tightensinteriorboltsastruss moves
ail.Thisdetailattachesandmain-
backline.Theguylines consistoftwo
100feetlong.Theyare attachedtothe
titsmidpoint.Therunningends ofeach
a suitableholdfast,suchasatreeor a
ekepttaut duringlaunchingtokeepthe
ebacklineconsistsofa %-inchsteelcable
rendsection.Thislineis heldandpayed
atruckortractor.Itsfunctionis to
hedacrossthegap.
detail.a.Whilethetrussesare be-
preparesthenear-and far-shoreabutments.
essaryandsubsillsleveledoff andputinto
line ofthebridge.Foursubsillsare used
utmentsillsarethen laidacrossthesubsills.
ngsteelpicketsintothe groundattheir
rthersecuredbytampingearthandother
oleis prepareddirectlybehindthefar-
centerline. Steelsnatchblocksaresecured
op andnearthebase.
exactly12i/2feetlong,thedistance
emultipleof 12%ieet,less2^2feet(length
lls).
g.51).a.Afterthetrusseshave
edonthenearbankandthelaunchingyokeis
a%-inchwinchcable,ispayedout and
Next,theendof thecableispulledthrough
eof theginpoleandis takenupthepoleand
earthetop,after whichitisstretchedback
roughasnatchblockpreviouslyhookedtothe
ecableisstretchedbackacrossthegap
oftheginpole.
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52/54
YBRIDGESH-10ANDH-2062-64
edacrossthegapbythe winch.When
enterpointitshouldbe allowedtodipone-
ordertolessen thestressesinthe tackle.It
andbacklinesbekeptas tautaspossiblein
mtopplingsidewaysorslidinguncheckedon
enhauledintoplaceonthe abutmentsill.
mustbemadebyjacks;lateraladjustments
s.
ps.Theprocedureforplacingthe
ythesameasdescribedin paragraph24.
ails,andclampingbeams.When
ampshavebeenplaced,thedeckingislaid.
alongtheouterendsof thedecking,parallel
dge.Holesforthe siderailsandtheclamp-
witha pneumaticdrill.Theclamping
dsecuredwithbolts,perpendicularandjust
fthetruss sections(fig.52).
ngbeaminstalled.
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53/54
ERS
GE
5
ge.TheH-20bridgeisreinforcedin
ortheH-10bridgeas discussedinparagraphs
RIDGEMAINTENANCE
maintenance66
gemaintenance.Paragraphs28
d bridgemaintenanceoftheH-10bridge
E
ngeneral,thebridgeisdismantled
durefollowedinerection.Theclamping-
ms,siderailbolts,siderails,anddeckingare
theabutmentramps.Toremovetruss,
ar-shoreendandrunline toginpole.Raise
htruckcraneand insertrollerbetweensill
section.Placeotherrollersas requiredby
Haul intrussbytruckor tractorwinch
uyl inesshouldbeemployedexactlyas
g.
Similarlythetrussitselfis dis-
rocessofassembly.Removeconnecting
nfirst)and,as soonassectionsareseparated,
s.
QUIPMENT
ment6!>
uipment.Paragraphs33to36,in-
eofH-10bridge equipmentapplyequally
ent.Storage,maintenance,andhandling
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54/54
YBRIDGESH-10ANDH-2069
ackleoftenis necessaryinmovingtruss
SETABLESIANDIV
;table IVisusedin thesameway.
comestoa H10bridge.Bridgeisnot
asbeen killed.Bridgeisfoundtobe
es.Find thiscombinationintableI.
ank,M3,weight14tons.Opposite"light
"caution."Thetankcrossesthebridge
g15tons isatthesamebridge. There
ble;but,sincethe14-tontank iscloseto
tontankalsocancrosswith caution.
eiscontinued.Anengineerofficer
areplacementforthebridgeguard.The
romthe columnheadedbythe72-footspan
nhereadsthebridge'scapacity,postsitat
owinginstructionstothenewbridgeguard:
ghlessthan13 tonstocrossatnormal
13and16tonsmaycrosswith caution
s.Ifanyload over16tonswantsto cross,
companyheadquarters."
econtinued.An18-tonlighttankcomes
altsitandsendsfor Lt.X,hisplatoon
andseesthatthetank isintheunsafe
nsheisbadlyneededon atacticalmission,
ankcross,butheexplainsthe riskto
extremecaution.Hadthebridge beenin
ouldnothavebeenallowedto cross.
TARYOFWAR:
(6);C5(10).
lsseeFM21-6.)
dentofDocuments,U.S.GovernmentPrintingOffice
5cents
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