I-Northwest Boring Co. Inc. (NWB) yase-Woodinville, eWashington, yathotyelwa ikontraka yi-Shoreline Construction ukuze kufakwe indawo kaxakeka yeSixeko sase-Mill Creek esingaphumelelanga kwi-36-in.umbhobho wesinyithi wamanzi esiphango obangele izikhukula kwindawo yasedolophini, emantla eSeattle.
Isidingo sokulungiswa kwesixokelelwano samanzi emvula siye sabonakala xa kwavela i-sinkhole ngoDisemba 2017, phakathi kwe-Sweetwater Ranch kunye neendawo zaseDouglas Fir.Kwenziwa umsebenzi wokulungisa okwexeshana, kodwa kwavela omnye umjelo kwakuloo ndawo inye kwinyanga nje enye kamva.Emva kokuhlolwa, kwagqitywa ukuba i-coupler engaphumelelanga kunye nomonakalo kwi-36-in.umbhobho wawungunobangela.Ngenxa yokuba isiXeko saseMill Creek sibhengeze le projekthi kaxakeka enohlahlo lwabiwo-mali olungaphantsi kwe-300,000 yeedola, inkqubo yokubhida kuluntu ibingafuneki.I-Shoreline Construction yakhethwa njengonokontraka, owathi wanikezela ngekontraka engaphantsi kwe-NWB.
Ulungelelwaniso olucwangciselwe ukutshintshwa lubekwe ngaphakathi kwe-easement emxinwa phakathi kwamakhaya amabini kubunzulu be-11-ft kumhlaba onzima.Ngemihlaba encinci, ubunzulu bofakelo kunye neemeko zejoloji, i-NWB yayazi ukuba inkqubo yayo ekruqulayo ye-Akkerman iya kuba lolona khetho lufanelekileyo lofakelo lodibaniso olutsha lwamanzi esitshi.
I-NWB iqeshe i-Akkerman GBM 4800 Series Jacking Frame yayo ene-torque ephezulu encamathele kwicasing ye-adaptha ye-auger ekruqulayo.Ukudibanisa kwenze ukuba kube lula ukufakela iipaseji zetyhubhu yokulinga kunye neesegmenti zemibhobho ye-10-ft kunye ne-torque kunye ne-jacking force yomatshini wokudinwa kwe-auger kodwa ngaphakathi kwe-shaft encinci.Uyilo lusebenzise ishafu yokuphehlelelwa ukuqalisa ukuhamba ukusuka kumacala omabini okuthe kwanciphisa ngakumbi ukuphazamiseka kwiipropati zabahlali kwaze kongiwa kwiindleko zeprojekthi.
Imeko yomhlaba eyayikho yayiyi-glacial till enamatye, nto leyo eqhelekileyo kulo mmandla.Lo mhlaba awunakususwa ngentloko yetyhubhu yokulingwa esemgangathweni ukuze i-NWB ilungiselele ukusebenzisa izixhobo ezikhethekileyo ukuya kuthi ga kwi-12,000 psi UCS yomhlaba.I-drill bit yokuzikhethela, i-Adapter ye-Rock Drill kunye ne-TriHawk drill bit, ikhokele i-pilot tube passes eyaseka i-140- kunye ne-110-lf ulungelelwaniso kumgca oyimfuneko kunye nebakala lokuhamba komxhuzulane.Kwangaxeshanye, inkqubo yokuthambisa efanelekileyo yomhlaba yasetyenziswa ukugungxula amagatya agrunjiweyo abuyele kwishaft yokuqalisa ukuze asuswe.
Abasebenzi ke balungiselela ukuqondisa ujack i-110- kunye ne-140-lf, 36-in.isitya sentsimbi.Phambi kwe-casing, i-NWB yazisa i-swivel yentonga yesikhokelo kunye ne-36-in.cutterhead ehambelana ne-36-in.i-casing diameter.Inxalenye ejikelezayo yesixhobo ifunxa ukujikeleza kwe-auger ngelixa i-cutterhead, ixhotyiswe nge-carbide gage cutter bit tooling, igrumba umhlaba onzima.Oku kudlula kwesibini kugqitywe nge-swivel yentonga yesikhokelo ene-cutterhead kuwo omabini amacandelo amanzi esiphango.
Ulungelelwaniso lwagqitywa nge-27-in.Umbhobho othwala i-Vylon obekwe ngaphakathi kwingxowankulu phambi kokuba uqhagamshelo lwenziwe.Ukususela ekuqaleni ukuya esiphelweni iprojekthi iyonke yaqukunjelwa kwisithuba nje senyanga, kusonjululwa ingxaki yeSixeko kwangexesha nongenelelo olungephi kubahlali.
Ixesha lokuposa: Nov-04-2019