2007_0709CA.pdf �

Technical Archives

DATE:9July2007

CLIENT:TheTrenchlessCompany,Sacramento,CA

JOBLOCATION:AgilentTechnologies,SantaClara,CA

JOB:200'sewersectionreplacementunderparkinglotdividerplantedwithmatureredwoodtrees,replacing8"VCPlinewith8"SDR�7PE,pullingupstream

SPECIALCONDITIONS:Product testing new 8" Footage/TRIC Unified Force impactor head

TOOLS:WC22hydraulicram,Case580backhoe

PROJECT LOG

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530�StevensCreekBoulevard,SantaClara,CA

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Sewerrunsunderlot/lanedividerplantedwithmaturetrees.

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Fusionandlandingareaonlotside.

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Viewfromentryend(downstreamexcavation).

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Entrypitis�0to�2feetdeepwithshoring.Existingclaypipeisbeddedinsand.Sewerwaslinedfromthispointtolowermanhole20-30feetdownstreaminordertoavoidexcavationorburstingaroundlargewatermaincrossingsewerpath.

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Usingjettertoretrieveandpullback220’ofairhose.

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Attachingairhosetojetterhose.

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Feedingbackairhosefromheadend.

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Airhosearrivesattailend.

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Impactorattachestohoseandthenslidesintosealedburstinghead.

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Drillingandsecuringpipetoheadwithsetscrews.

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Attachedtostandardclevisandreadytotest.

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WC22ramsetonpulleybaseinexitpit,readytoinsertcable.

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Pullerisremovedwhencableclevisapproachespulleywheel,thencableisdetachedandreplacedwithachaintohooktobackhoebucket.

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Shoring/excavationisperpendiculartopipeline,sospaceislimitedforbuckettopullwithhammerassist.

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Directing force in line with pipe in deep, confined space is difficult.

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Pullinganothertwofeetorso,withimpactor.

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Whenheadispulledasfarasspaceallows,backhoeismovedtoentrypitforattemptedpush.

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Cuttingpipeinentrypit,beingcarefulnottocutairhose.

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Pushingwithhammermakeslittleornoprogress.

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Headassemblyismovedtocompressortoattemptremovalofimpactor.

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Hookingimpactoruptoairsupplyaftersettinghammerinreverse.

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Impactor is firmly wedged inside head.

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Stillnoseparation.Applyinganti-seizeonimpactorshaftpriortousemightfacilitateremovalafterjob,orperhapsstandingtheunitonitsnoseagainst a solid surface would help the hammer release itself. Otherwise, modification of mating surface inside mole may be in order.