Ukwahlulwa kwezinto eziphathekayo yingxaki ekhoyo kuninzi logcino lwetekhnoloji.Njengoko imfuno yeemveliso ezikumgangatho ophezulu isanda, ingxaki yokwahlukaniswa kwempahla iba qatha ngakumbi.
Njengoko sonke sisazi, itelescopic radial stack conveyors sesona sisombululo sisebenzayo sokwahlula istaki.Banokudala uluhlu lweempahla kwiingqimba, uluhlu ngalunye lwenziwe ngamanani ezinto eziphathekayo.Ukudala uluhlu lwempahla ngale ndlela, umhambisi kufuneka aqhube phantse ngokuqhubekayo.Ngelixa intshukumo yeetelescopic conveyors kufuneka ilawulwe ngesandla, i-automation yeyona ndlela isebenzayo yokulawula.
Abahambisi abazenzekelayo abarhoxiswayo banokucwangciswa ukwenza uluhlu lwempahla ngokweendidi ezahlukeneyo zobukhulu, iimilo kunye noqwalaselo.Oku kubhetyebhetye okungenakulinganiselwa kunokuphucula ukusebenza kakuhle kunye nokuhambisa iimveliso ezikumgangatho ophezulu.
Iikontraka zichitha izigidi zeedola ngonyaka ngamnye zivelisa iimveliso ezidityanisiweyo zosetyenziso olubanzi.Izicelo ezithandwa kakhulu ziquka izinto ezisisiseko, i-asphalt kunye nekhonkrithi.
Inkqubo yokudala iimveliso zezi zicelo inzima kwaye iyabiza.Ukucaciswa okuqinileyo kunye nokunyamezela kuthetha ukuba ukubaluleka komgangatho wemveliso kuya kuba kubaluleke ngakumbi.
Ekugqibeleni, izinto eziphathekayo ziyasuswa kwi-stockpile kwaye zihanjiswe kwindawo apho ziya kufakwa kwi-subgrade, i-asphalt okanye ikhonkrithi.
Izixhobo ezifunekayo zokuhluba, ukuqhushumba, ukutyumza kunye nokuhlola zibiza kakhulu.Nangona kunjalo, izixhobo eziqhubela phambili ziyakwazi ukuvelisa iaggregate ngokweenkcukacha.Uluhlu lwempahla lunokubonakala ngathi luyinxalenye nje encinci yokwenziwa kwemveliso ehlanganisiweyo, kodwa ukuba yenziwe ngokungalunganga, inokubangela ukuba imveliso ithotyelwe ngokugqibeleleyo neenkcukacha ezingahlanganiyo neenkcukacha.Oku kuthetha ukuba ukusebenzisa iindlela zokugcina ezingalunganga kunokubangela ukulahlekelwa ezinye zeendleko zokudala imveliso esemgangathweni.
Nangona ukubeka imveliso kwi-inventri kunokuphazamisa umgangatho wayo, uluhlu lwempahla luyinxalenye ebalulekileyo yenkqubo yokuvelisa ngokubanzi.Yindlela yokugcina eqinisekisa ubukho bezinto eziphathekayo.Umlinganiselo wemveliso udla ngokwahlukileyo kumlinganiselo wemveliso efunekayo kwisicelo esinikiweyo, kwaye uluhlu lwempahla lunceda ukwenza umahluko.
Uluhlu lwempahla lukwanika iikontraka indawo eyaneleyo yokugcina ukuba ziphendule ngokufanelekileyo kwimfuno eguquguqukayo yemarike.Ngenxa yeenzuzo ezinikezelwa ngukugcinwa, kuya kuhlala kuyingxenye ebalulekileyo yenkqubo yokuvelisa ngokubanzi.Ke ngoko, abavelisi kufuneka baqhubeke bephucula itekhnoloji yabo yokugcina ukunciphisa imingcipheko ehambelana nokugcinwa.
Isihloko esiphambili seli nqaku sisodwa.Ukwahlula kuchazwa ngokuthi "ukwahlulwa kwezinto ngokuhambelana nobukhulu bamasuntswana".Usetyenziso olwahlukileyo lwe-aggregates lufuna amabakala athile kakhulu kunye nemathiriyeli efanayo.Ukwahlula kukhokelela kwiiyantlukwano ezigqithisileyo kwiintlobo zemveliso.
Ukwahlula kungenzeka naphi na kwinkqubo yokwenziwa kweaggregate emva kokuba imveliso icunyuziwe, yahluzwa yaza yadityaniswa kudidi olufanelekileyo.
Indawo yokuqala apho ulwahlulo lungenzeka khona kuluhlu lweempahla (jonga uMfanekiso 1).Nje ukuba imathiriyeli ifakwe kwi-inventri, ekugqibeleni iya kuphinda isetyenziswe kwakhona ize isiwe kwindawo eya kusetyenziswa kuyo.
Indawo yesibini apho ukwahlukana kunokwenzeka ngexesha lokucubungula kunye nokuthutha.Kanye kwindawo ye-asphalt okanye isityalo sekhonkrithi, i-aggregate ifakwe kwi-hoppers kunye / okanye imigqomo yokugcina apho imveliso ithathwa kwaye isetyenziswe khona.
Ukwahlula kuyenzeka kwakhona xa kuzaliswa kunye nokukhupha izisele kunye nezisele.Ukwahlula kunokuthi kwenzeke ngexesha lokusetyenziswa komxube wokugqibela kwindlela okanye enye indawo emva kokuba i-aggregate ixutywe kwi-asphalt okanye i-concrete mix.
I-homogeneous aggregate ibalulekile kwimveliso yomgangatho ophezulu we-asphalt okanye ikhonkrithi.Ukuguquguquka komgangatho we-aggregable ekhutshwayo kwenza ukuba kube nzima ukufumana i-asphalt okanye ikhonkrithi eyamkelekileyo.
Amasuntswana amancinci obunzima obunikiweyo anomhlaba omkhulu opheleleyo kunamaqhekeza amakhulu obunzima obufanayo.Oku kudala iingxaki xa kudityaniswa iaggregates kwi asphalt okanye imixube ekhonkrithi.Ukuba ipesenti yeentlawulo kwi-aggregate iphezulu kakhulu, kuya kubakho ukungabikho komdaka okanye i-bitumen kwaye umxube uya kuba mkhulu.Ukuba ipesenti ye-coarse particles kwi-aggregate iphezulu kakhulu, kuya kubakho ukugqithisa komdaka okanye i-bitumen, kwaye ukuhambelana komxube kuya kuba kuncinci kakhulu.Iindlela ezakhiwe ngeeaggregates ezahlukanisiweyo zinolwakhiwo olulambathayo kwaye ekugqibeleni ziya kuba nexesha elisezantsi lokuphila kuneendlela ezakhiwe ngeemveliso ezahlulwe ngokufanelekileyo.
Izinto ezininzi ezikhokelela ekuhlulweni kwii-stocks.Kuba uninzi lweempahla zenziwe kusetyenziswa amabhanti okuhambisa, kubalulekile ukuqonda impembelelo yendalo yamabhanti okuhambisa ekuhleleni izinto.
Njengoko ibhanti lihambisa izinto phezu kwebhanti lokuhambisa, ibhanti libetha kancinci njengoko liqengqeleka phezu kwepuli engasebenziyo.Oku kungenxa yokucotha okuncinci kwebhanti phakathi kwepuli nganye yokungenzi nto.Le ntshukumo ibangela ukuba iincinci ezincinci zihlale phantsi kwecandelo lomnqamlezo wezinto eziphathekayo.Ukugqithisa iinkozo ezirhabaxa kuzigcina ziphezulu.
Ngokukhawuleza ukuba izinto zifikelele kwivili lokukhutshwa kwebhanti yokuhambisa, sele sele ihlulwe ngokuyinxalenye kwizinto ezinkulu phezulu kunye nezinto ezincinci ezisezantsi.Xa izinto ziqala ukuhamba ngegophe levili lokukhupha, iinqununu eziphezulu (zangaphandle) zihamba ngesantya esiphezulu kunezincinci ezisezantsi (zangaphakathi).Lo mahluko kwisantya emva koko ubangela ukuba amasuntswana amakhulu amke kumhambisi phambi kokuba awele kwisitaki, ngelixa amasuntswana amancinane awela ecaleni komhambisi.
Kwakhona, kunokwenzeka ukuba amasuntswana amancinci abambelele kwibhanti yokuhambisa kwaye angakhutshelwa de kube ibhanti lokuhambisa liqhubeka lihamba emoyeni kwivili lokukhupha.Oku kubangela amasuntswana acolekileyo ngakumbi abuyela umva ukuya ngaphambili kwesitaki.
Xa imathiriyeli iwela kwi-stack, amasuntswana amakhulu anesantya esingaphezulu sangaphambili kunamasuntswana amancinci.Oku kubangela ukuba imathiriyeli erhabaxa iqhubeleke nokuhla ngokulula kunemathiriyeli ecolekileyo.Nayiphi na imathiriyeli, enkulu okanye encinci, eyehla emacaleni emfumba ibizwa ngokuba kukuchitheka.
Ukuchitheka sesinye sezizathu eziphambili zokwahlukana kwempahla kwaye kufuneka kuphetshwe nanini na kunokwenzeka.Njengoko ukuchitheka kuqalisa ukuqengqeleka ukuhla kwithambeka lenkunkuma, amasuntswana amakhulu athanda ukuqengqeleka kubude bonke bethambeka, ngeli lixa imathiriyeli ecolekileyo ithande ukuzinza emacaleni enkunkuma.Ngenxa yoko, njengoko ukuchitheka kuhambela ezantsi emacaleni emfumba, amasuntswana amahle ambalwa nambalwa asalayo kwizinto ezibhilwayo.
Xa izinto zifikelela kumda ophantsi okanye inzwane yemfumba, iqulunqwe ngokukodwa ngamaqhekeza amakhulu.Ukuchithwa kubangela ukuhlukana okuphawulekayo, okubonakalayo kwicandelo lesitokhwe.Inzwane yangaphandle yemfumba iquka izinto ezirhabaxa, ngelixa imfumba yangaphakathi nangaphezulu iqulethe izinto ezicolekileyo.
Ubume bamaqhekeza nawo bunegalelo kwimiphumo emibi.Amalungu agudileyo okanye arawndi athanda ukuqengqeleka ezantsi kwithambeka lestake kunamasuntswana amahle, aqhele ukuba nesikwere ngokwemilo.Ukugqithisa imida kunokukhokelela kumonakalo kwizinto eziphathekayo.Xa amasuntswana eqengqeleka kwelinye icala lengqumba, ayakhuhlana omnye komnye.Oku kunxitywa kuya kubangela ukuba amanye amaqhekeza aphule ukuya kwiisayizi ezincinci.
Umoya sesinye isizathu sokuzahlula.Emva kokuba izinto zishiya ibhanti lokuhambisa kwaye ziqala ukuwela kwi-stack, umoya uchaphazela umzila wokuhamba kweengqungquthela zobukhulu obuhlukeneyo.Umoya unempembelelo enkulu kwizinto ezibuthathaka.Oku kungenxa yokuba umlinganiselo womphezulu womhlaba kubunzima bamasuntswana amancinane mkhulu kunobo bamasuntswana amakhulu.
Ubunokwenzeka bokuqhekeka kwi-inventri inokwahluka ngokuxhomekeka kuhlobo lwezinto eziphathekayo kwindawo yokugcina impahla.Eyona nto ibaluleke kakhulu ngokumalunga nokwahlula yinqanaba lokutshintsha ubungakanani bamasuntswana kwizinto eziphathekayo.Izinto eziphathekayo ezinokwahluka okukhulu kwesayizi ye-particle ziya kuba neqondo eliphezulu lokuhlukana ngexesha lokugcinwa.Umgaqo oqhelekileyo wesithupha kukuba ukuba umlinganiselo wesayizi enkulu kunazo zonke ukuya kwi-particle encinci ye-particle idlula i-2: 1, kunokubakho iingxaki ngokuhlukana kwephakheji.Ngakolunye uhlangothi, ukuba i-particle size ratio ingaphantsi kwe-2: 1, ulwahlulo lomthamo luncinci.
Ngokomzekelo, izinto eziphantsi kwe-subgrade eziqukethe amaqhekeza ukuya kwi-200 mesh inokunciphisa ngexesha lokugcinwa.Nangona kunjalo, xa ugcina izinto ezifana nelitye elihlanjiweyo, ukugquma kuya kuba yinto encinci.Ekubeni uninzi lwesanti lumanzi, ngokufuthi kunokwenzeka ukugcina isanti ngaphandle kokwahlula iingxaki.Ubumanzi bubangela ukuba amasuntswana ahlangane, athintele ukwahlukana.
Xa imveliso igcinwa, ukuzihlukanisa ngamanye amaxesha akunakwenzeka ukukhusela.Umda wangaphandle wemfumba ogqityiweyo uquka ubukhulu becala izinto ezirhabaxa, ngelixa ingaphakathi lemfumba liqulethe ukuxinwa okuphezulu kwezinto ezintle.Xa uthatha izinto ezivela ekupheleni kweemfumba ezinjalo, kuyimfuneko ukuthatha i-scoops kwiindawo ezahlukeneyo ukuxuba izinto.Ukuba uthatha imathiriyeli kuphela ngaphambili okanye ngasemva kwesitaki, uya kufumana yonke imathiriyeli erhabaxa okanye yonke imathiriyeli entle.
Kukwakho namathuba okugquma okongeziweyo xa kulayishwa iilori.Kubalulekile ukuba indlela esetyenziswayo ayibangeli ukuphuphuma.Layisha umphambili welori kuqala, uze emva, kwaye ekugqibeleni ube phakathi.Oku kuya kunciphisa iziphumo zokugcwala kakhulu ngaphakathi kwilori.
Iindlela zokuphatha emva koluhlu lwempahla ziluncedo, kodwa injongo ifanele ibe kukuthintela okanye ukunciphisa ukuvalelwa kwabantu bodwa ngexesha lokwenziwa koluhlu lwempahla.Iindlela eziluncedo zokuthintela ukuba wedwa ziquka:
Xa zipakishwe elorini, kufuneka zipakishwe ngokucocekileyo kwizitaki ezahlukeneyo ukunciphisa ukuchitheka.Izinto eziphathekayo kufuneka zihlanganiswe kunye kusetyenziswa umlayishi, ukunyusa ukuphakama kwebhakethi epheleleyo kunye nokulahla, okuya kuxuba izinto eziphathekayo.Ukuba umlayishi kufuneka ahambe kwaye aphule izinto, musa ukuzama ukwakha iimfumba ezinkulu.
Ukwakhiwa kwe-inventri kwiileya kunokunciphisa ulwahlulo.Olu hlobo lwesitora lunokwakhiwa ngebulldozer.Ukuba izinto zihanjiswa eyadini, i-bulldozer kufuneka ityhale i-material kwi-sloping layer.Ukuba isitakhi sakhiwe ngebhanti yokuhambisa, ibulldozer kufuneka ityhale impahla ibe umaleko othe tye.Kwimeko nayiphi na into, kufuneka kuthathwe unonophelo ukuba ungatyhala izinto phezu komphetho wemfumba.Oku kunokukhokelela ekuphuphumeni, enye yezizathu eziphambili zokuhlukana.
Ukupakisha ngeebulldozers kunento engalunganga.Imingcipheko emibini ebalulekileyo kukuthotywa kwemveliso kunye nokungcoliswa.Izixhobo ezinzima ezisebenza ngokuqhubekayo kwimveliso ziya kudibanisa kwaye zityumze izinto.Xa usebenzisa le ndlela, abavelisi kufuneka balumke bangayithobi kakhulu imveliso kwiinzame zokunciphisa iingxaki zokwahlukana.Umsebenzi owongezelelekileyo kunye nezixhobo zokusebenza ezifunekayo kaninzi zenza le ndlela ibize kakhulu, kwaye abavelisi kufuneka babhenele ekwahlukaneni ngexesha lokulungiswa.
Ukuhanjiswa kweRadial stacking kunceda ukunciphisa impembelelo yokwahlukana.Njengoko uluhlu lwempahla luqokelelana, umhambisi uhamba ngemitha ukuya ngasekhohlo nasekunene.Njengoko umhambisi ehamba ngemitha, iziphelo zezitaki, ngokuqhelekileyo zemathiriyeli erhabaxa, ziya kugqunywa ngezinto ezintle.Iminwe yangaphambili nasemva iya kuba rhabaxa, kodwa ingqumba iya kuxutywa ngakumbi kunemfumba yeecones.
Kukho ubudlelwane obuthe ngqo phakathi kokuphakama kunye nokuwa kwamahhala kwezinto kunye neqondo lokuhlukana okwenzekayo.Njengoko ukuphakama kunyuka kwaye i-trajectory yezinto eziwayo iyanda, kukho ukuhlukana okunyukayo kwezinto ezintle kunye ne-coarse.Ngoko ke abahambisi bobude obuguquguqukayo yenye indlela yokunciphisa ulwahlulo.Kwinqanaba lokuqala, umqhubi kufuneka abe kwindawo ephantsi.Umgama oya kwipuli yentloko kufuneka uhlale umfutshane kangangoko.
Ukuwa ngokukhululekileyo kwibhanti lokuhambisa kwisitaki sesinye isizathu sokwahlukana.Izitebhisi zamatye zinciphisa ulwahlulo ngokuphelisa izinto eziwa ngokukhululeka.I-staircase yamatye sisakhiwo esivumela izinto ukuba zihambe phantsi ngamanyathelo kwiimfumba.Iyasebenza kodwa inosetyenziso olulinganiselweyo.
Ukwahlula okubangelwa ngumoya kunokuncitshiswa ngokusebenzisa ii-chutes zeteleskopu.Iichute zeTelescopic kwizithungu zokukhupha zomthuthi, ukusuka kwisithungu ukuya kwisipaki, zikhusela emoyeni kwaye zinciphise impembelelo yazo.Ukuba iyilwe ngokufanelekileyo, inokukhawulelana nokuwa kwamahhala kwezinto.
Njengoko kukhankanyiwe ngaphambili, sele kukho i-insulation kwibhanti yokuhambisa ngaphambi kokufikelela kwindawo yokukhupha.Ukongezelela, xa izinto eziphathekayo zishiya ibhanti lokuhambisa, ulwahlulo olongezelelweyo lwenzeka.Ivili le-paddle linokufakwa kwindawo yokukhupha ukuze udibanise le nto.Amavili ajikelezayo anamaphiko okanye iipaddles ezihamba kunye nokuxuba indlela yezinto.Oku kuya kunciphisa ucalucalulo, kodwa ukuthotywa kwezinto kunokungamkeleki.
Ukwahlukana kunokubandakanya iindleko ezibalulekileyo.Uluhlu lwempahla olungahambelaniyo nemigaqo lunokukhokelela kwizohlwayo okanye ukukhatywa kwalo lonke uluhlu lwempahla.Ukuba izinto ezingahambelaniyo zihanjiswa kwindawo yomsebenzi, izohlwayo zingadlula i-$ 0.75 ngetoni nganye.Iindleko zabasebenzi kunye nezixhobo zokubuyisela kwisimo sangaphambili iimfumba ezikumgangatho ophantsi zihlala zinqabile.Iindleko zeyure zokwakhiwa kwendawo yokugcina impahla enebulldozer kunye nomsebenzisi ziphezulu kunexabiso lesixhobo sokuhambisa iteleskopu esizenzekelayo, kwaye imathiriyeli inokubola okanye ingcoliseke ukuze kugcinwe ukuhlelwa ngendlela eyiyo.Oku kunciphisa ixabiso lemveliso.Ukongeza, xa izixhobo ezifana ne-bulldozer zisetyenziselwa imisebenzi engeyiyo imveliso, kukho ithuba leendleko ezihambelana nokusebenzisa izixhobo xa zisetyenziselwa imisebenzi yokuvelisa.
Enye indlela inokuthathwa ukuze kuncitshiswe ifuthe lokuzihlukanisa xa usenza uluhlu lwempahla kwizicelo apho ukwahlukana kunokuba yingxaki.Oku kubandakanya ukupakisha ngokwemigangatho, apho umaleko ngamnye wenziwe ngothotho lwezitaki.
Kwicandelo lokupakisha, isitaki ngasinye siboniswa njengestakhi esincinci.Ukwahlula kusenzeka kwimfumba nganye ngenxa yeempembelelo ezifanayo ebezixoxiwe ngaphambili.Nangona kunjalo, ipateni yokwahlula idla ngokuphindaphindiweyo kulo lonke icandelo lomnqamlezo wemfumba.Ezo mfumba kuthiwa “zinesisombululo sokwahlulwa” okukhulu ngenxa yokuba ipateni yokuthambeka ecacileyo iphinda rhoqo kwizithuba ezincinci.
Xa ucubungula izitaki kunye nomlayishi wangaphambili, akukho mfuneko yokuxuba izinto, njengoko i-scoop enye ibandakanya iimfumba ezininzi.Xa i-stack ibuyiselwe, iileyile zomntu ngamnye zibonakala ngokucacileyo (jonga uMfanekiso 2).
Izitaki zingenziwa ngokusebenzisa iindlela ezahlukeneyo zokugcina.Enye indlela kukusebenzisa ibhulorho kunye nenkqubo yokuhambisa yokuhambisa, nangona olu khetho lufanelekile kuphela kwizicelo ezimileyo.Isithintelo esibalulekileyo seenkqubo zokuhambisa ezimileyo kukuba ubude bazo buqhele ukumiswa, nto leyo enokukhokelela ekwahlukaneni komoya njengoko kuchaziwe ngasentla.
Enye indlela kukusebenzisa i-telescopic conveyor.Izihambisi zeTelescopic zibonelela ngeyona ndlela isebenzayo yokwenza izitaki kwaye zihlala zikhethwa kunezixokelelwano ezimileyo njengoko zinokushukunyiswa xa kufuneka, kwaye uninzi luyilelwe ukuba luthwalwe endleleni.
Iiconveyors zeTelescopic ziquka iiconveyors (abagcini babalindi) ezifakwe ngaphakathi kwiconveyors zangaphandle ezinobude obufanayo.Umhambisi wencam unokuhamba ngomgca kubude bomthumeli wangaphandle ukuze atshintshe indawo yepuli yokothula.Ukuphakama kwevili lokukhupha kunye nesikhundla se-radial somhambisi kuyaguquguquka.
Utshintsho lwetriaxial lwevili lokothula lubalulekile ekudaleni iimfumba ezinomaleko ezoyisa ucalucalulo.Iinkqubo zewinch zentambo zikholisa ukusetyenziselwa ukwandisa kunye nokurhoxisa izihambisi zefidi.Ukunyakaza kwe-radial ye-conveyor kunokwenziwa ngekhonkco kunye nenkqubo ye-sprocket okanye nge-hydraulically driven planetary drive.Ubude bomhambisi budla ngokutshintshwa ngokwandiswa kweesilinda ze-telescopic undercarriage.Zonke ezi ntshukumo kufuneka zilawulwe ukwenza ngokuzenzekelayo iimfumba ze-multilayer.
Iiconveyors zeTelescopic zinesixhobo sokwenza izitaki ezininzi.Ukunciphisa ubunzulu bomaleko ngamnye kuya kunceda ukunciphisa ukuhlukana.Oku kufuna ukuba umhambisi aqhubeke ehamba njengoko uluhlu lwempahla lusanda.Isidingo sokuhamba rhoqo senza ukuba kube yimfuneko ukwenza i-automate telescopic conveyors.Kukho iindlela ezininzi ezahlukeneyo zokuzenzela, ezinye zazo zingabizi kakhulu kodwa zinemida ebalulekileyo, ngelixa ezinye zicwangciswa ngokupheleleyo kwaye zibonelela ngokuguquguquka ngakumbi ekudaleni uluhlu lwempahla.
Xa umhambisi wempahla eqala ukuqokelela imathiriyeli, ishukuma ngokukhawuleza ngelixa ihambisa imathiriyeli.Umhambisi uyashukuma de umda wokutshintsha unyuswe kwishaft yokuhambisa uqaliswe ecaleni kwendlela yayo yeradial.I-trigger ibekwe ngokuxhomekeke kubude be-arc ukuba umqhubi ufuna ibhanti lokuhambisa lihambe.Ngeli xesha, umthumeli uya kwandiswa ukuya kumgama osele umiselwe kwaye aqalise ukuhamba kwelinye icala.Le nkqubo iyaqhubeka de i-stringer conveyor yandiswe kwi-extension yayo ephezulu kwaye umaleko wokuqala ugqityiwe.
Xa inqanaba lesibini lakhiwe, i-tip iqala ukuhoxiswa kwi-extension yayo ephezulu, ihambisa i-radially kunye ne-retracting kumda we-arcuate.Yakha iileya de i-tilt switch ifakwe kwivili lokuxhasa isebenze yimfumba.
Umhambisi uya kunyuka umgama obekiweyo kwaye aqale ilifti yesibini.Umntu ngamnye ophakamisayo unokuba nemigangatho emininzi, ngokuxhomekeke kwisantya sezinto eziphathekayo.Ukuphakanyiswa kwesibini kufana neyokuqala, kwaye njalo kuze kube yilapho yonke imfumba yakhiwe.Inxalenye enkulu yemfumba eyisiphumo iye yabekwa yodwa, kodwa kukho ukuphuphuma kwincam yemfumba nganye.Oku kungenxa yokuba amabhanti okuhambisa akakwazi ukulungelelanisa ngokuzenzekelayo indawo yokutshintsha umda okanye izinto ezisetyenzisiweyo ukuzivula.Umyinge wokubuyisela umva kufuneka ulungelelaniswe ukuze i-overrun ingangcwabi i-shaft yokuhambisa.