2006_1114CA.pdf 1
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
2006_1114CA.pdf 2
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.
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