Izinsiza ze-CFA zifaka phakathi kwemishini esebenzayo nezithako ezibalulekile zokusebenza kwe-continuous flight auger drilling, indlela evamile yokwakha amapile aphakeme emfundweni ye-geotechnical engineering yanamuhla. Le nkathazo ifaka phakathi amafliya e-auger, ama-bar e-hollow kelly, amathuluzi okusika, izinhlelo zokuhlangana, kanye nezici ezihlobene nokuboreka ezenzelwe ukusebenza ngokuhlanganyela nezinsiza ze-CFA. Le mishini kumele ikwazi ukumelana namandla aqinile okujikeleza kanye ne-axial ngenkathi igcina ukunemba kuyo yonke inqubo yokuboreka, okwenza ikhwalithi nokunakekelwa okufanele kube kubalulekile ukuze iphumelele emsebenzini wokwakha izisekelo. Ukuhamba kwemishini ye-continuous flight auger drilling kubonisa indlela ephusile yokufaka amapile lapho i-auger ejikelezayo eqhubeka phansi ngasikhathi sinye iphuma umhlaba ngama-auger flights. Njengoba i-auger ifinyelela ejulile elidingekayo, i-concrete ephezulu eguquguqukayo iphushwa nge-hollow kelly bese iya phansi ngekolomu ye-auger ngenkathi amafliya e-auger ekhishwa, eqhuba umhlaba futhi kwakha iphile ye-concrete eqinisiwe. Izinsiza ze-CFA kumele zakhiwe ukuze zisebenze kahle kule midlalo emibili, nezifliya ze-auger eziklanyelwe ukususa kahle imfucumfucu ezimweni zomhlaba ezihlukahlukene ukusuka ku-clay, silt kuya kumhlope nengwenya. Amathuluzi okusika endaweni ye-auger kumele asebenze ngokwethembeka ezitrateni eziphukile, kuhlanganisa neziphunga ezikhanyayo kanye nezimo zomkhawulo, ngenkathi zigcina ukuzinza kokuboreka ngaphandle kokuxhaswa kwe-bentonite noma kwe-polymer, okuvumela isiphetho esihle kunezinye izindlela zokwakha izisekelo ezijulile. Imishini esetshenziswa emisebenzini ye-CFA ifaka phakathi ama-augers amafliya anokunambitheka okwehlukile kwe-pitch kanye nosayizi, izinhlelo ze-hollow kelly ezisiza ukuhanjiswa kwe-concrete, ama-rods wokwandisa nezixhumi ezihlanganisayo, kanye nezihloko zokusika ezikhethekile ezivumelana nezimo zomhlaba zendawo. Iziqalo ezijikelezayo nezinhlelo zokushayela zikhonza ukujikeleza okuqhubekayo okudingekayo kokuboreka, ngenkathi izinhlelo zokuhanjiswa kwe-concrete eziphumayo kumele zixhunywe kahle nezinga lokukhishwa kwe-auger. Izinsiza ze-CFA zikwamukela ukuhluka okukhulu kwezimo zomhlaba, kusuka ku-clay ethambile lapho izidingo zokuqhuba zingaphansi, kuya kumsandvo onzima nezindonga ezithambile ezifuna izingxenye ezihamba phambili, ezingenakunqwabelana. Le miphumela ithathe izindlela zokuboreka eziqhamukayo ukuze zakhe izisekelo zezindlu, izakhiwo zezigijimi, nezinhlelo zokwakha izakhiwo kwezomnotho ezindaweni eziphakathi nezimboni lapho izikhala nezimo zemvelo zifuna izixazululo ezisezingeni. Izicelo zezinsiza ze-CFA zifaka phakathi izakhiwo zezimali, izindawo zokuhlala ezihlasimuli, izinsiza zokuhamba, kanye neminyango eyakhelwe kwezobunjiniyela lapho udinga amapile anamandla aphezulu ngaphandle kokuphazamisa umhlaba kakhulu. Ukusebenza kahle kwale ndlela ekulungiseni umhlabathi onezinkinga, lapho ukugwema imfucumfucu kwehlisa umthelela kwemvelo, kuqhubeke kwandisa ukuthathwa kwayo. Abakhi bezinhlelo abangochwepheshe kanyenochwepheshe bezisekelo bethembele ezinsizeni ze-CFA ezisezingeni ukuze bafeze izisekelo ezijulile ezihambisana nezindleko, ezikhiqizayo emvelweni, nezibopho ezihlala ziqinile ngaphakathi kwemihlahlandlela edingekayo nehlukahlukene yemithombo yokwakha yanamuhla emhlabeni wonke.
Izigaba ze-CFA auger zimelela izingxenye ezibalulekile zokubhoboza ngaphakathi kwendlela yokwakha izisekelo ezinzulu ye-continuous flight auger piling, zisebenza njengesitsha esiyisisekelo sokusika nokukhipha umhlabathi ekwakheni izisekelo ezinzulu. Lezi zingxenye ze-augers ezinemilomo emikhulu zenziwe ngokunembile ukuze zingene ezicini ezihlukene zomhlaba nezitini ngesikhathi ziphinde zisebenzise impahla ethathwe emhlabeni ibe phezulu ngesikhathi sokubhoboza. Izigaba ze-augers zakha umgudu oqhubekayo wokubhoboza ophenduka ngokumelana nomhlaba, ngezinhlelo zabo ezichwepheshile zepikiki ezihlose ukukhulisa ukunyakaza komhlaba nokugcina ukuzinza kokubhoboza. Izigaba ngazinye zixhunywe kahle kumasething ehlangene ngama-threa, kuvumela abaphathi ukuthi bandise ubunzima bokubhoboza kancane njengoba isisekelo sifinyelela ezingeni lakhe lokwakhiwa. Ikhwalithi nokunemba kokukhiqizwa kwezigaba ze-augers kuthinta ngqo ukusebenza kokubhoboza, ubuqotho bezikhukhula, kanye nempumelelo yonke ye-CFA pile installation, okwenza zibe izingxenye ezibalulekile kumabhizinisi asebenzayo ezimakethe ezinzulu zokwakha. Izigaba ze-CFA auger ziphumelela ezimweni zezindawo ezehlukene ezihlanganisa amapholisi ahlakaniphile nezinsibeni kuya kumhlabathi okhulu okuhlanganisa izihlabathi nezinsalela, nezinguquko ezikhethekile ezenziwe ukuze zisebenzise izitini ezibandayo kanye nemishini yokuhlanganiswa okubuthakathaka. Idizayini ye-continuous flight igcina ukuzinza komhlaba ebhodi ngokukhipha umhlaba ngaphandle kokudinga ikheshi yangaphandle ezimeni ezikhululekile, okuwenza kube yinzuzo ehlukile uma kuqhathaniswa nezindlela zokuhlanza ezisindisa noma ezidonsela phansi. Ububanzi be-augers ejwayelekile buphakathi kuka-300 mm kuya ku-1000 mm noma ngaphezulu, kanti ubude bezigaba bushintshekelwe ukuze kuthelwe kahle nokuxhumana okusheshayo ngesikhathi sokuqhuba. I-pitch ye-helical blade kanye nobubanzi be-core bwenziwa ukuze buhambisane nezimo zomhlaba nezimo zokubhoboza, kuvumela ukubhoboza okuphumelelayo ezindaweni ezingaphezu kuka-50 metres. Izicelo zokuthuthukisa umhlaba zivame ukusebenzisa izigaba ze-CFA auger lapho izisekelo ezinzulu zidinga ukungena ezindaweni ezithambile noma ezinzima, kuhlanganisa amapholisi agxilile, umhlaba ongenamphumela, kanye nezimo zomhlaba eziphakathi ezijwayelekile ezakhiweni zasemadolobheni nasezindaweni zokuthuthukisa ezimbonini. Ukwamukelwa kwemishini nokusebenza kwayo kusekelwe ezicini ezinembe ezimbhalweni ze-augers kanye nezinhlelo zokugcina ezimisiwe ngabakhi bokubhoboza kanye nabakhi bezisekelo. Izigaba ze-augers kufanele zixhumeke kahle nemishini yokubhoboza ephezulu, kuhlanganisa nohlelo lwe-top-drive, ama-kelly bars, nama-torque limiters, ukuqinisekisa ukudluliswa kwamandla okuvumelanayo nezinga lokuthuthuka kwemikhondo. Izinqubo zokufaka ze-CFA zisebenza ngokuqhubeka kokuhamba kwe-augers ngaphandle kokuphazamiseka ngesikhathi sokukhishwa, kuvumela izigaba ze-augers ukuthi zithathe umhlabathi ophakathi ngokuphumelelayo ngesikhathi umphumpi wokufaka uhamba phambili udlulisa i-concrete eqinile ngaphakathi emhlolanjeni. Abasebenzi abangochwepheshe bayazi ukuthi isimo sezigaba ze-augers sithinta ngokuqondile ukusebenza kokubhoboza, ikhwalithi yokufaka i-concrete, kanye nokusebenza kwe-pile yoyilo. Ukutshalwa kwezimali ekukhiqizweni kwezigaba ze-augers ezisezingeni eliphakeme, izinqubo zokuhlola ezijwayelekile, kanye nezimo zokugcina ezifanele kuholela emiphumeleni engabhalwa ngempumelelo ngezikhathi ezincane, ikhwalithi yokuveza ihlandla, kanye nokuthenjwa kwezinsiza zokwakha ze-geotechnical ezihlanganisa ukwakhiwa kwemizi emidala, izimpande zezimoto, nezinhlelo zokwakhiwa ezidinga izixazululo eziphezulu zokuhlanza umhlaba.
Amathuluzi e-CFA pilot ayizithako ezibalulekile ezikhethekile eziqinisekisa inqubo yokubhoboza nge-auger yokuhamba okuqhubekayo ekwakheni izisekelo ezijulile. Lezi zibhengezo ezakhiwe kahle zisetshenziswa ekusungulweni kwezimbobo, zisebenza ukuthinta izendlalelo zomhlaba eziphezulu futhi zakhe ivulekile yokuqala ye-shaft ehola yonke i-auger assembly phansi. Emisebenzini yokubhoboza nge-auger yokuhamba okuqhubekayo, ama-pilot bits abhekelela ukuvula umhlaba nokusungula ukuhlelwa kwezakhiwo ngaphambi kokuba ama-auger flights agcwale ubuqotho. Uk dizayini kanye nezincazelo zalezi bits ziba nomthelela oqondile ekuphumeleleni kokubhoboza, ikhwalithi yemigudu, kanye nesikhathi sokuphothulwa kwephrojekthi. Ama-pilot bits kufanele akwazi ukuhambisana nezimo zomhlaba ezihlukahlukene ezitholakala ezindaweni ezincane, kusukela kumathuli omhlabathi owamukelayo nendawo encane kuya kumsand и uphiko olujulile, okwenza ukwakhiwa kwabo nezimo zokugijima zibe sezingeni eliphezulu ukuze kuqinisekiswe impumelelo yokubhoboza. Ukusetshenziswa kwama-CFA pilot bits kuqhubeka kulo lonke uchwepheshe bokwakha izisekelo, kufaka phakathi ukwakhiwa kwezimbobo ezijulile, ama-piles aborwe, kanye nezisekelo ezijulile zezakhiwo eziphakeme, izigcawu, amaphrojekthi ezokuthutha, kanye nezikhungo zezimboni. Abaphakeli bezobunjiniyela be-geotechnical basebenzisa ama-pilot bits ukuze basungule izimbobo ezinzima lapho kuthuthukiswa umhlaba noma zidingeka izindlela zokubhoboza ezikhethekile. Lezi bits zibalulekile ezindaweni zasemadolobheni lapho ukubhoboza okuqondile nokunganciki kokushaya ukuphuka kuyadingeka, kanye nasezindaweni ezinokufinyelela okukhawulelwe lapho amathuluzi wokubhoboza aconiwe kanye nezithako ezisebenzayo zikhombisa ngqo ezinhlelweni zephrojekthi. Ikhono le-pilot bit lokungena ngokushesha ezindaweni zomhlabathi eziphezulu kukhuthaza izinhlelo zokubhoboza ezisheshayo, kunciphisa isikhathi sokuphumula kwemishini futhi kuthuthukise umkhiqizo wabasebenzi kuma-oda wokwakha acushiwe. Ama-pilot bits e-CFA kufanele asebenze ngokuthembekile ezimweni ezahlukene zomhlabathi nezimo zomhlaba, kusukela kumagcobo aphezulu angenamandla kuya emhlabathini abhulwa ngemigqa efanele. Ababholi bakhetha izincazelo zama-pilot bits ngokuya ngemininingwane yokuhlola engaphansi komhlaba kanye nokulindelwa kokumelana nokubhoboza, balinganisa ezimeni ezifana nombala wesihlabathi, ukujula komswakama, nokuba khona kwezindlovu noma izendlalelo ezivimbela. Ama-bits kufanele agcine ukunembile kokuma ngesikhathi sokuqala ukuze kuqinisekiswe ukuthi ama-auger flights alandelayo evola phezulu futhi ablebhuze, kuvinjelekile ukunyakaza okungase kwezomzimba ukwehlisa i-shaft. Ukubhoboza nge-auger yokuhamba okuqhubekayo ngezitholelo ezikhethiwe ze-pilot bits kukhuthaza ubuhlobo obuhle bemigudu nokhwalithi yezindonga uma kuqhathaniswa nezindlela ezijwayelekile ze-rotary, ikakhulukazi ezimweni zokungazinzile zomhlaba lapho ubuhlobo bemigudu phakathi kokubhoboza bukhala. Ukutholwa kwama-CFA pilot bits afanele kubonisa ukutshalwa kwemali okukhulu empumelelweni yomsebenzi wokubhoboza. Abahlinzeki bemishini abaqondene nobuchwepheshe bokubhoboza be-auger yokuhamba okuqhubekayo banikeza izimo ezihlukene zama-pilot bits ezithuthukisiwe kwezimo zomhlaba ezithile nezindawo zokubhoboza, kusukela kuma-pilot bits okwakhiwa ngezisekelo eziphakeme ukuya kwama-variations okuphuthumayo okubuyela kokubhoboza izimbobo ezijulile ezidlula kumamitha angama-40. Ukugcina kahle ama-pilot bits, okubandakanya ukulungisa imiphetho kanye nezikhathi ezikulungile zokushintshwa, kuqinisekisa ukusebenza okuvamile kokubhoboza futhi kwandisa ubude bokuphila kweziqeshana. Abapheki bokwakha abaphethe izisekelo belindele ukuthi lezi bits ezikhethekile zisebenze kahle ekwandiseni ukusetshenziswa kwe-auger rig, ezifinyelela ezindleleni ezivunyelwene zokuqhuba, futhi zigcine ukunemba kobuchwepheshe okudingekayo ngezinga lokwakha lemiphakathi yanamuhla.
Izingxenye ze-Continuous Flight Auger (CFA) zibonisa izingxenye ezibalulekile zomshini phakathi kwezinhlelo ezikhethekile zokwakha izisekelo ezijulile kanye nezinhlelo zokufaka amapayipi. Ukuhlinzwa kwe-CFA kubonakala njengendlela ephumelelayo futhi ehlukeneyo yokwakha amapayipi ajulile anobubanzi obukhulu ezindaweni zejoloji ezihlukahlukene. Izingxenye ze-CFA auger zisebenza njengokwakhiwa okwenziwe ngokunembile okuxhumanisa izingxenye ze-auger zodwa, kuqinisekisa ukuhlala kwezokwakha kanye nokudluliswa kwamandla okuqinisekisiwe phakathi nenqubo yokuhluza. Lezi zingxenye kufanele zikwazi ukumelana nezinsiza ezinkulu zokuhlabana, amandla okuhlanganisa axialis, kanye nesenzo sokucindezela kwezakhamzimba zomhlabathi kanye nezindonga ezitholakala ngesikhathi sokungena ngaphansi komhlaba. Ikhwalithi yobunjiniyela kanye nezincazelo zezinye izithako zalezi zingxenye ziphumelela ngqo ekusebenzeni kahle kokuhlinzwa, ukuqina kwemishini, kanye nempumelelo jikelele yokufaka izisekelo emaphakathini, ezihlahleni, nasemaphandleni ayizinsiza ezibalulekile emhlabeni jikelele. Imisebenzi yokuhlingwa kwe-CFA esebenzisa izingxenye ze-auger eziphephile nezisezingeni eliphakeme ingaphefumula kuphela izimo zomhlabathi abazikhaliphayo, kusukela kumasekeli maphakathi nesihlahla ukuya kumayelana nohlelo lwezihlahla zezindonga, izingcezu ezigoqayo, namahlathi aqhamukayo. Uhlelo lwe-continuous flight auger lusebenza ngokujikeleza kokwakha okuhlinzekayo okuhamba phambili kuhlangene nokukhipha izinto eziphuma ngaphansi komhlaba, kuqeda izinqubo zokuhlinza ezidingekayo ezindaweni zokuhlinziwa ezijwayelekile. Izingxenye ezihlanganisayo ezihlangene ze-auger zedlula izigidi zokuphindaphinda ngesikhathi semisebenzi evamile futhi kufanele zibe nekhono elikhethekile lokumelana nokudlula ukunqoba kokukhathala kanye nokuzinza okungokwengxenye. Izimo ezingafani zomhlaba—kubandakanya izakhiwo eziphathekayo, umhlaba okhuphuka, izinto ezimahamba kahle, kanye nezingxenye eziphazamisekile—zibonisa izidingo ezahlukene ezikhuluma ngokuqondile kumafani e-CFA. Osebenza ezokwakha kanye nososayensi bezisekelo bakhetha ukuhlinzwa kwe-CFA ukuze kwakhiwe izisekelo, amaphoyisa ephilisi, izigaba zemikhumbi kanye nemikhakha yokuthuthukiswa komhlaba, lapho izinzuzo zokwakha ezisheshayo, umsindo ophansi, kanye nokuncipha komsindo kube yizici ezinkulu ezibalulekile ezindaweni ezinamaphakheji. Izingxenye ze-auger ze-CFA zanamuhla zifaka izinzuzo zokwenziwa kwezinto kanye nolwazi lokusebenza oluqoqiwe ezinkulungwaneni zezinhlelo zokwakha ezijulile eziphethwe emhlabeni jikelele. Abahlinzeki kanye nochwepheshe bokuhlinza baphendukisa ezinhlelweni ze-auger ezihlanganisiwe eziphephile ukuze bagcine izinga lokukhiqiza elibucayi ukuze kudayiswe okuncintisana, ikakhulukazi emisebenzini yezinsiza nezithuthukisi ezidinga ukuphuthuma. Ukuhlala kwezingxenye zokuxhumanisa kwe-flange kuthinta ngqo ukusebenza kweqembu, ukutholakala kwemishini, izikhathi zephrojekthi, kanye nokwaneliseka kokuhweba. Ukuze kuvunyelwe izincazelo ezikhona, izinqubo zokugcina, kanye nokushintshwa kwesikhawudlanzana sezinto ezikhubazekile noma eziphukile, kubalulekile ekuphathweni okuhle kwezimoto kwezakhiwo ezikhethekile ezisebenza ezindaweni ezinhlobonhlobo nezimo zejoloji ezinzima. Imakethe ye-CFA yokuhlinzwa emhlabeni jikelele ibonisa ukufunwa okukhulayo okuvela ezibhedlela, emaphakathini, kanye nabasizi bezinsiza abafuna izixazululo ezijulile ezinamazinga aphansi, ezisendleleni, nezisebenziseka ngokuthuthukisa aeze zemvelo.
Izinsiza ezikhethekile ze-CFA zimele amathuluzi abalulekile nezithako ezithembisa amandla ezinhlelo zokushaya i-auger eziphakathi kokwakhiwa kwemigqa e deep foundation kanye nezicelo ze-geotechnical. Lezi zinsiza ezikhethekile zandisa ukuhlela nokusebenza kwe-CFA rigs ngesikhathi sokufaka izimbobo eziyinkimbinkimbi, ukuthuthukiswa komhlaba, kanye nemisebenzi yokuzinza komhlaba ezimweni zejogazi ezahlukene. Noma kunjalo ekubhekaneni nezithombe zomhlaba ezinzima, ukuthuthukisa amandla okuphawu, noma ukusebenzisa izindlela zokudrill ezikhethekile, izinsiza ezikhethekile ze-CFA zivumela abaqashi ukuba bahlale belungile ezixazululweni zabo zokwakha izisekelo nangokwenza umsebenzi ophumelelayo emakhaya. Uhlu lwezithako ezikhethekile olukhona luvumela abasebenzi ukuba benze ngezindlela zabo ezivamile ze-auger ukuze zihambisane nezidingo zomsebenzi ezingehilelanga izinhlelo zokushaya eziyinzima ngokwakho, okwenza kube yisixazululo esiphumelelayo sezindleko kwabathengi abaphatha izinkinga eziningi zokwakha izisekelo. Ekukhathaleleni izisekelo, ukuhamba kwe-CFA kuvunywa kakhulu ngokusebenza kahle kwawo ekufakeni izimbobo zokuhamba ezinciphisa ukuphazamiseka komhlaba ngenkathi kuthuthukisa amandla aphezulu okusindisa. Amathuluzi akhethekile ezinhlelo ze-CFA ahlanganisa ama-casing oscillators, ama-casing wesikhashana anemihlahlandlela ethile, ama-kelly bars aneziro ezithuthukisiwe, kanye nezindawo zokuxhuma kumathuluzi okuthuthukisa umhlaba njengezinhlelo zokugrouta kanye nezinsiza zokudlidliza. Lawa mathuluzi avumela abasebenzi ukuthi benze i-CFA drilling ezimakethe eziphakathi kwe-clays ezinzima kanye nezinsizakalo ze-granular nakuba kunezindlela ezihlanganisiwe lapho izindlela zendabuko zingase zibe nzima. Ikhono lokwethula izindlela zokuthuthukisa umhlaba ezilawulwayo ngesikhathi sokufaka izimbobo kwenza izinsiza ezikhethekile ze-CFA zibe nezindleko kakhulu kumaphrojekthi adinga ukuthuthukiswa kokucindezela kwangaphakathi, zithuthukise amandla wokuphatha, noma zisebenze ngokuhlanganyela. Izicelo ziya emiphakathini yasemadolobheni lapho ukungqubuzana nokukhala kuncane kubalulekile, kanye nasezindaweni zokwakha ezisemva kwemanzini futhi ezikude lapho ukufaneleka kokuthuthuka nezimo zokusebenza kubalulekile. Ukusebenza kahle kwezinsiza ezikhethekile ze-CFA kusekelwe ekukhetheni izithako ezihambisana nezimo zomhlaba, izinhlelo zamanzi angaphansi, nezidingo zokwakha. Abakhiqizi abathola izimfuno ezihambisana nezinhlelo ezimaphakathi ze-auger bathola inzuzo yokufinyelela kumathuluzi okudrill akhethekile athuthukisa ukufaka ngokusebenzisa izindawo ezinzima, izithombe zomhlaba ezingafani, kanye nezimo ezisezingeni eliphezulu noma eziphikisanayo. Izinsiza zanamuhla ze-CFA ezikhethekile zifaka izinhlelo zokwakha ezinemigomo yokuhambisana ezinhlelweni ezihlukahlukene ze-rig ngenkathi zigcina ukusebenza kahle kokudrill nokuphepha ngesikhathi sokufaka izimbobo. Ochwepheshe bokuthuthukisa umhlaba babaluleka kakhulu kulawa mathuluzi ngenxa yekhono lawo lokuhlanganisa imisebenzi yesibili efana nokufaka izinto zomgogodla eziphansi, ukufaka ukuphakela, noma ukuvibro-compaction ngaphakathi komjikelezo owodwa. Uma ekhethwe kahle futhi ukusebenza kahle, izinsiza ezikhethekile ze-CFA zithuthukisa kakhulu imiphumela yephrojekthi ngokunciphisa isikhathi sokwakha sonke, kunciphisa umthelela kwendawo, futhi kuvumela abaqashi ukuba bafeze izidingo ezicatshangelwe kahle kumaphrojekthi ezisekelo ezezakhiwo, ezentengiso, ezimboni, kanye nezabasebenza kahle kwezomnotho.
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