Ithuluzi le-Kelly libalulekile ekwakheni izisekelo ezijulile, lenzelwe ngokukhethekile ukusetshenziswa ngemishini yokudrill e-phakathi ukuze kube nokuthuthukiswa kwezinsiza zokudrill zingena emhlabeni. Lezi zithuluzi zokudrill ezikhethekile zihlukaniswa ngokwakhiwa kwazo okuqinile, okuvamise ukwenziwa ngensimbi enamandla, okuqinisekisa ukuhlala kahle nokwethembeka ezimeni ezinzima zomhlaba. Ukuze kusebenze ngokusebenziseka kodwa ngempumelelo, ama-Kelly bars axhunywe kumugqa wokudrill futhi azungeza nemishini yokudrill, adlulisa i-torque futhi avumele ukuhamba kwejaji. Le mekhani ehlukile ivumela ukudrill kwezimbobo ezijulile nokufakwa kwezingxenye ezahlukene zezakhiwo, njengama-piles nama-caisons, emhlabeni. Emkhakheni wezobunjiniyela bokuhlola umhlaba kanye nomsebenzi wezisekelo ezijulile, ama-Kelly bars adlala indima ebalulekile ezinhlelweni ezahlukahlukene. Avamise ukusetshenziswa ekufakeni ama-shafts amade adrilled, ama-micro-piles, kanye nama-augers, okwenza kube kwadingeka emaphrojekthini adinga ukuvikeleka okuphakeme ezimeni zokwakhiwa eziyinkimbinkimbi zomhlaba. Umsebenzi wama-Kelly bars ubonakala kakhulu kumaphrojekthi wokwakha edolobheni lapho izinkinga zokuhamba nokuqapha ukuhamba okufanele kubalulekile. Ngaphezu kwalokho, ukuhlekisana kwawo kuvumela ukusetshenziswa kwi-technique ezahlukene zokuthuthukisa umhlaba, njengokuhlanganiswa komhlabathi kanye nokumisa, okubalulekile ekuqinisekiseni ubuqotho bezakhiwo ezakhiwe ezindaweni ezinzima. Uma ukhetha ama-Kelly bars ezinhlelweni ezithile, kumele kubhekwane nezinkomba ezithile. Lokhu kuhlanganisa ububanzi be-bar, ubude, nomqondo wethethi, okungaba nemthelela omkhulu ekusebenzeni kahle kokusebenza kokudrill. Ububanzi obujwayelekile buphakama ukusuka ku-10 kuya ku-20 amayindi, kanti ubude buhluka ngokuya ngobude bendawo efunwayo. Ngaphezu kwalokho, ukukhetha phakathi kwezinhlelo ze-Kelly bar ezinkulu noma ezimbili kungaba nomthelela empumelelweni yokudrill; ama-Kelly bars amabili anikeza ukusimama okukhulile kanye ne-torque, okwenza kube kuhle kakhulu ezinhlelweni ezinzima. Enye into ebaluleke kakhulu ekukhetheni kwalesi simo ukuxhumana kwama-Kelly bars nemishini yokudrill esebenziswayo. Izingqikithi ezahlukene zingase zidinge imiklamo ethile ye-Kelly bar ukuqinisekisa ukusebenza okuhle nokuphepha phakathi kokusebenza. Ngaphezu kwalokho, ukuhlola izimo zomhlaba kanye nezidingo zephrojekthi kuzoholela ekwenzeni isinqumo sokuthi iyiphi uhlobo lwe-Kelly bar olufanele, njengoba emiklamo ethile ingase ifaneleka kangcono emhlabeni obambekayo noma owokuphalaza. Ngamafuphi, ama-Kelly bars iyithuluzi eliyisisekelo ekwakheni izisekelo ezijulile nasemiqondisweni ehlolayo, evumela ukusebenza kahle futhi okuphumelelayo kokudrill ezinhlelweni ezahlukahlukene. Ukuklama kwawo okuqinile, ukuhlekisana, kanye nekhono lokudlulisa i-torque kwenza kube kwadingeka kumakhenikha nabobunjiniyela abafuna ukuqinisekisa ukuzinza nokuphepha kwezikhungo zabo. Ngokuqonda izinkomba ezibalulekile kanye nezimfuneko zokukhetha, ochwepheshe embonini bangakwenza izinqumo ezihlakaniphile ezithuthukisa impumelelo yamaphrojekthi abo.
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