2007 0709 Ca
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2007_0709CA.pdf Technical Archives DATE: 9 July 2007 CLIENT: The Trenchless Company, Sacramento, CA JOB LOCATION: Agilent Technologies, Santa Clara, CA JOB: 200' sewer section replacement under parking lot divider planted with mature redwood trees, replacing 8" VCP line with 8" SDR7 PE, pulling upstream SPECIAL CONDITIONS: Product testing new 8" Footage/TRIC Unified Force impactor head TOOLS: WC22 hydraulic ram, Case 580 back hoe PROJECT LOG
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Transcript of 2007 0709 Ca
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
2007_0709CA.pdf 2
530�StevensCreekBoulevard,SantaClara,CA
2007_0709CA.pdf 3
Sewerrunsunderlot/lanedividerplantedwithmaturetrees.
2007_0709CA.pdf �
Fusionandlandingareaonlotside.
2007_0709CA.pdf 5
Viewfromentryend(downstreamexcavation).
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Entrypitis�0to�2feetdeepwithshoring.Existingclaypipeisbeddedinsand.Sewerwaslinedfromthispointtolowermanhole20-30feetdownstreaminordertoavoidexcavationorburstingaroundlargewatermaincrossingsewerpath.
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Usingjettertoretrieveandpullback220’ofairhose.
2007_0709CA.pdf 8
Attachingairhosetojetterhose.
2007_0709CA.pdf 9
Feedingbackairhosefromheadend.
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Airhosearrivesattailend.
2007_0709CA.pdf ��
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.
2007_0709CA.pdf �7
Directing force in line with pipe in deep, confined space is difficult.
2007_0709CA.pdf �8
Pullinganothertwofeetorso,withimpactor.
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Whenheadispulledasfarasspaceallows,backhoeismovedtoentrypitforattemptedpush.
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Cuttingpipeinentrypit,beingcarefulnottocutairhose.
2007_0709CA.pdf 2�
Pushingwithhammermakeslittleornoprogress.
2007_0709CA.pdf 22
Headassemblyismovedtocompressortoattemptremovalofimpactor.
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Hookingimpactoruptoairsupplyaftersettinghammerinreverse.
2007_0709CA.pdf 2�
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.
