2006 1114 Ca

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Technical Archives

DATE:14November2006

CLIENT:PatriotPlumbing,Torrance,CA

LOCATION:11653So.SierraBonita,LosAngeles,CA

JOB:50'sewerlateralreplacementfromrearofhousetopropertyline,replacing4”VCPbell-and-spigotlinewith4”SDR17PE,pullingupstream

SPECIALCONDITIONS:Dry,compactedsoil,combination90ºturnapproximately12to14feetdownstreamfrompullingpit

TOOLS:TC24hydraulicram,Enerpac13HPhigh-pressurepump

PROJECT LOG

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Fusingneartheentrypit,aslopingembankmentatsidewalk’sedge.

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3/4”swagedcableisstrungthroughthesewerfromedgeofsidewalktohouse.

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Sewerpathindicatedbydashedgreenline,withpullingpitatrightforeground.Note90ºbendbehindtree(twoop-posing45ºbends)13’to14’downstreamfrominitialpullingpit.Suchbendsarenotusuallyrecommended,butocca-

sionallymaybenegotiatedwhenclosetotheentrypit(whereasherethebendisclosetotheexit,orpullingpit).

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Crewexcavatestofreecableembeddedinground.Asexpected,the90ºbendclosetotheexitpitcausedthecableto“cutthecorner”andsliceintocompactedsoiloutsidethesewer’spath.Maximumhydraulicpressures

wereappliedandwaterwasintroducedtotheline,butthecornerwastooabruptandtoofarfromtheentry.

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Withinafewfeetoftheresistanceplate,thecablehasalreadybrokenoutsideclaysewer.Asmorehydraulicpressurewasapplied,thecableonlycutfurtheroutsidethesewerpath,intothecornerandunderthetree,while

theburstinghead50’downstreamdidnotevencompletelyentertheline.

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Cameralocatingthecombination90ºcornerfromtheexploratoryexcavation.Anotherexcavationnearthecornerwillbecomethenewpullingpit.

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Tostraightenoutthepullandcreateabettersewerpath,anewexitpitwillbeduginfrontoftheworkeratright.

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Diggingthenewexitpit.

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Amoredirectsewerpathiscutinfrontofthetree,ratherthanfollowtheoriginalpatharoundbehindit.

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Pullingfromtherelocatedexitpit.Evenwithwaterintroducedtothisstraight-linesectionofclaypipe,mid-rangepressures(translatingto14–16tonsofforce)arerequiredtoburst.

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Reroutedupperportionofsewerpath,priortoconnectionwithnewPEsection.