Amamasti ophakathi (leader masts) ayizithako ezibalulekile zama-rigs aphakamisayo ajolise ekwandiseni ukusebenza kahle kanye neprecision kumaphrojekthi okugxila ezindaweni ezinzulu nezobuchwepheshe bokwakha. Lezi zakhiwo eziqinile zinikeza ukwesekwa okudingekayo kanye nokuhlanyisayo kokuhanjiswa nokufakwa kwamapile, ukuqinisekisa ukusebenza kahle okuphezulu ezimweni ezihlukahlukene zomhlaba. Ngokuvamile efakwe phezulu kwesizinda se-crawler se-rig yokuphakamisa, amamasti ophakathi ahlinzeka ngempumelelo yokunyakaza kwesiqondisi kanye nemigqa edingekayo ukuze kubekwe kahle ithuluzi lokuvala amapile. Le msebenzi ibalulekile ekwenzeni imisebenzi yokuphakamisa eyinkimbinkimbi, kufaka phakathi amapile aphakanyisiwe, amapile abhujiswa, kanye namapile amancane (micropiles). Umqondo wokusebenza komasti ophakathi (leader mast) ulula kodwa uphumelelayo. Inezixhumanisi ezilandelanayo eziqondile ezivumela umshini wokuphakamisa (piling hammer) noma ithuluzi lokugaya (auger) ukuba lehle ngesikhathi esifanele. Ukuklanywa komasti kuvumela umqhubi ukuthi agcine i-angular efanele kanye nokuhlanganiswa ngesikhathi sokufakwa kwamapile, okubalulekile ukuze kufezwe umthwalo odingekayo kanye nokwakheka okuqinile ezinhlelweni zokwakha ezijulile. Ukuhluka kokusetshenziswa kwamamasti ophakathi kwenza kube kuhle kumaphrojekthi ahlukahlukene, ukusuka ezakhiweni eziphakeme, ezindaweni zokwakha kanye nezindonga zokugcina. Ngokwezimfuneko, amamasti ophakathi ahluka kakhulu kuye ngenjiniyela kanye nezidingo ezithile zephrojekthi. Izici ezijwayelekile zivamise ukufaka ukuphakama okungashintshi, amandla ahlukahlukene okubeka, kanye nokuhlangana nezinsiza zokuphakamisa ezahlukene, ezifana nezinsiza eziphoqayo, ukuvuvukala (vibratory drives), kanye nezihloko ezijikelezayo. Izimfuneko zokukhetha umasti ophakathi ofanele kufanele zicatshangelwe izinto ezifana nezimo zomhlabathi, usayizi wephrojekthi, kanye nohlobo lwamapile oluphakanyisiwe. Ukucabangela okwengeziwe kungase kufake phakathi isisindo somasti, ubukhulu bezinhlaka, kanye namandla okuphakamisa e-rig ye-crawler, ukuqinisekisa ukuthi yonke indlela ihlonyiswa ukuze ifane nekhono lokusebenza nokuphepha. Izicelo ezisemqoka zamamasti ophakathi kumsebenzi wokwakha ezijulile nezobuchwepheshe kubandakanya izimo ezihlukahlukene. Zisetshenziswa kakhulu ezinhlelweni zokwakha ezisemadolobheni lapho isikhala sikhulu, futhi ukufakwa okuqondile kubalulekile. Ngaphezu kwalokho, amamasti ophakathi adlala indima ebalulekile ekuthuthukiseni umhlaba, njenge-stabilization yomhlabathi nokuphakanyiswa kwezisekelo, lapho zisebenza ukuze zifake amapile akhethekile okwandisa ikhono lokuthwala umhlabathi nokunciphisa izinkinga zokuhlala. Ngokukhula kwezidingo zokwakha ezihlala zisebenza, amamasti ophakathi asetshenziswa nasezinhlelweni ezihambisana nemvelo ezidinga ukuphazamiseka okuncane endaweni nasemthethweni. Kulabo abahlanganyela ukuthenga noma ukuqasha amamasti ophakathi ngamajigi aphakamisayo, kubalulekile ukukhetha imishini ehambisana nezidingo ezithile zephrojekthi zakho. Ukuxhumana nabahlinzeki abaziwayo abahlinzeka ngama-masts anemisebenzi ethuthukisiwe kungathuthukisa kakhulu ukusebenza kahle nokuphumelela kwephrojekthi. Noma kungabe ubandakanyeka ekuthuthukiseni izindlu, ezohwebo, noma ezokwakha izikhungo, ukutshalwa kwemali kumamasti ophakathi aphezulu kuyingxenye ebalulekile ohambweni lokuphumelelisa umsebenzi wokwakha izisekelo ezijulile kanye nezixazululo zobuchwepheshe.
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