Northwest Boring Co. Inc. (NWB) na Woodinville, Washington, Shoreline Construction ne ya ba shi kwangila don maye gurbin gaggawa na City of Mill Creek ya gaza 36-in.bututun ruwan guguwa na karfe da ya yi ta haddasa ambaliya a unguwar da ke bayan gari, arewa da Seattle.
Bukatar gyaran tsarin ruwan guguwa ya bayyana a lokacin da tudun ruwa ya bayyana a watan Disamba 2017, tsakanin unguwar Sweetwater Ranch da Douglas Fir.An gudanar da aikin gyare-gyare na ɗan lokaci, amma an sake samun wani rami a wuri ɗaya bayan wata ɗaya.Bayan dubawa, an ƙaddara cewa an gaza ma'aurata da lalacewa ga 36-in.bututu ne tushen dalilin.Domin Birnin Mill Creek ya ayyana wannan aikin gaggawa tare da kasafin kuɗi ƙasa da dala 300,000, ba a buƙatar tsarin ƙaddamar da jama'a ba.An zaɓi Ginin Shoreline a matsayin ɗan kwangila, wanda ya ba da kwangilar aikin da ba shi da tushe ga NWB.
An sanya jeri-jefi da aka shirya don maye gurbinsu a cikin ƴan ƴar ƴar sauƙi tsakanin gidaje biyu a zurfin 11-ft a cikin ƙasa mai wahala.Tare da ƙarancin ƙasa, zurfin shigarwa da yanayin yanayin ƙasa, NWB ya san cewa tsarin sa na ban sha'awa na Akkerman zai zama kyakkyawan zaɓi na shigarwa don sabbin hanyoyin haɗin ruwa.
NWB ya yi amfani da Akkerman GBM 4800 Series Jacking Frame tare da babban abin da aka makala adaftar casing don auger m.Haɗin ya ba da damar shigar da bututun matukin jirgi da sassan bututun 10-ft tare da juzu'i da ƙarfin juzu'i na na'ura mai ban sha'awa amma a cikin ƙarami.Ƙirar ta yi amfani da shingen ƙaddamarwa guda ɗaya don ƙaddamar da gudu daga bangarorin biyu wanda ya ƙara rage rushewa ga kadarorin mazaunin kuma an adana shi akan farashin aikin.
Yanayin ƙasa ya kasance glacial har zuwa dutsen, wanda ya saba da wannan yanki.Ba za a iya raba wannan ƙasa tare da daidaitaccen shugaban tuƙi na matukin jirgi don haka NWB ya shirya don amfani da kayan aiki na musamman don ƙasan psi 12,000 UCS.Zaɓin rawar soja, Adaftar Dutsen Drill tare da TriHawk drill bit, ya jagoranci bututun matukin jirgi wanda ya kafa alignment na 140- da 110-lf a layin da ake buƙata da daraja don kwararar nauyi.A lokaci guda, an yi amfani da tsarin maɗaɗɗen ƙasa da ya dace don zubar da ɓangarorin da aka tono a mayar da mashin jefar don cirewa.
Crews sannan suka shirya don jagorantar jack 110- da 140-lf, 36-in.karfe casing.A gaban casing, NWB ya ƙaddamar da sandar jagora tare da 36-in.cutterhead wanda yayi daidai da 36-in.casing diamita.Bangaren jujjuyawar kayan aikin ya ɗauki jujjuyawar auger yayin da mai yankan, sanye da kayan aiki mai ɗorewa na carbide gage cutter bit tooling, ya tono ƙasa mai wahala.An kammala wannan wucewa ta biyu tare da sandar jagora tare da mai yanke kan sassan ruwa na guguwa.
An gama jeri-jefi da 27-in.Bututun mai ɗaukar hoto na Vylon wanda aka sanya a cikin kwandon kafin a yi haɗin kai zuwa abubuwan da ke akwai.Tun daga farko har ƙarshe an kammala aikin gabaɗaya a cikin ƙasa da wata guda, inda aka warware matsalolin birnin cikin lokaci tare da ɗan kutsawa ga mazauna.
Lokacin aikawa: Nov-04-2019