tm 5-274 portable steel highway bridges h-10 and h-20, 1943

7/30/2019 Tm 5-274 PORTABLE STEEL HIGHWAY BRIDGES H-10 AND H-20, 1943

1/54

Y

Publ

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athitrust.org/access_

use#pd-google


2/54

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

PublicDomain,Google-digitized

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use#pd-google


3/54

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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4/54

YBRIDGESH-10AKDH-20

LAMPr-SIDERAIL

IOERAIL^SIDERAILCLAMP

tionofportablesteelhighwaybridge.

ssgap.


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5/54

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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6/54

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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7/54

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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8/54

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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9/54

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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10/54

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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11/54

U6

RSHEARLUGS^ENDELEVATION

ationofendtrusssection.

tbeingtightened.


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12/54


atchetwrench.

se,dismantled.


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13/54

s.

p.

mp.


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14/54

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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15/54

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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16/54

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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17/54

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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19/54

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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edistancementionedabove,forthenthetruss

hesillandtends tocreepunderalive load.

dneverbesoplacedthatthe edgeofthe

dof thetruss.

esectionbeingunloadedfromtruck.

rmediatesectionsbeingboltedtogether.


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21/54

oflaunchingnosebeingattachedtoendsection.

noflaunchingnosebeingattachedtorearsection.


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22/54


erbeiuginsertedbenentutruss.

oftrussbeingbolted.


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23/54

erinplacebehindabutmentsill.

nbankforabutmentsill.


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24/54


traeutsillon lootings.

lbeingsecuredinplace.


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25/54

utmeiitsill.

vveenabutmentsillsbeingchecked.


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26/54

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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28/54


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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29/54

ngfarbank.

nubline.


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YBRIDGESH-10AX'DH-2023

ockandtackleconnectedtolaunchingnose.

selieiughauledupon afarbank.


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31/54

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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32/54


inplaceonabutmentsill.

ssectioninordertodisengagelaunchingnose.


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33/54

usedasrampforreceptionoflaunchingnose.

mentrampbeingplaced.


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34/54


planks.

derails.


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35/54

on.

bridge.


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36/54

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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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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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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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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econnectingboltsarespecial1%-inch

hsquareheadsand hexagonalnuts.The

the nuts,2y2pounds.

G

atimiofendwction.

on,anderectionprocedureofabutmentplan.

ard%-inchcarriagebolts,12inches

ches,securetheguardrailstothe deck


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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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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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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


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


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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