Izixhumi zomoya zisebenza njengemishini ebalulekile yokuxhasa kwezobunjiniyela bemifantu emikhulu, zinikeza umoya ophansi onethemba lwezikhala ezinhlobonhlobo zama-tools neziqhelo ezisetshenziswa phakathi kokwakhiwa kwemishini ye-diaphragm wall, ukufakwa kokugwema okuphakamile, kanye nemisebenzi ethile yokuthuthukisa umhlaba. Njengemishini ebalulekile yokuxhasa, izixhumi zomoya zenza kube nokwenzeka ukusetyenziswa kwemishini esebenza ngogesi kumasayithi akhululekile lapho ezinye izinsiza zamandla zingase zibe nzima, ngenkathi zikhulula umoya ophansi oqhubekayo, ophathwayo okungafani nemingcele yokwakha. Ezinhlelweni zokwakha imifantu emikhulu, izixhumi zomoya zisebenza ezindaweni eziningi zokusebenza. Ngesikhathi sokwakhiwa kwemishini ye-diaphragm wall, ziqhuba ama-drill abangelwayo, ama-chisel aphumayo, nezinye amathuluzi abalulekile ukuze kufakwe ukuqina nobuchwepheshe bokwakha izinto. Emisebenzini ye-jet grouting—kungaba uhlelo lwezinto ezithile noma ukuwatshala—izixhumi zisebenzisa umoya omkhulu osetshenziselwa ukwehlisa amathuba ahlanganisayo kanye nokukhipha izinsalela zomhlaba. Ukufakwa kwemibhoshongo yokugwema kuvame ukufuna umoya ohlangene ukuze kuvinjwe uthuli ngesikhathi sokumba, ukusebenza kwemishini yokuphuka amatshe, kanye nezinhlelo zokukhulula amanzi. Ngaphezu kwalokho, izixhumi zixhasa imisebenzi yokushaya ama-pile intersection ne-pile sheet ngokuphakelwa kwe-impact breakers kanye nemishini yokuvusa umoya, ngenkathi zivumela ukuhlolwa kwama-pile aphothuliwe kanye nok upkeep kwezinqubo ze-hydraulic. Umqondo wokusebenza ugxile ekucindezelweni komoya okukhethiwe ngama-rotary screw, ama-piston aphumayo, noma izinhlelo ze-centrifugal, kanye nokulethwa komoya ophansi ngemali ebekiwe (imvamisa 6–10 bar kumathuluzi ajwayelekile, 20–40 bar kumasiko okhethekile) nokugeleza okulinganiswa nge-cubic meters ngomzuzu (m³/min). Umoya ophansi uyabanda ngemuva kokuphakelwa ukuze kuncishiswe okuqukethwe komswakama, uhlanzwa ukuze kukhishwe izinto ezincane, futhi kulawulwa ukuze kuhlale kunomfutho ophumayo ongu-constant phakathi kwezingcaphuno ezahlukene. Izingunitshe ze-mobili ezi-m304 zisebenza ngokuvamile zifakwe kumaphethini anemikhono noma amenezi amabhasi emanzini ukuze kube nokuthuthuka. Ukuhlelwa okukhona kufaka phakathi izixhumi zokukhishwa kwemoya eziphakanyisiwe (37–75 kW) ezifanelekile emisebenzini yokukhuthaza ukuze kudlule kumathuluzi amaningi, kwi trailer-mota ebaleleni (75–300+ kW) enokuphakelwa okuphezulu okuqhubekayo. Izinhlobo ze-compressor zifaka phakathi ama-rotary screw angasebenzi ngefutha—okuthandwa kum hindla ezidinga ikhwalithi yomoya ngaphandle kokuhlanza i-oil—nema-designs anama-lubrication afanelekile ukunikela ngempumelelo engcono kumasilisili aphakeme. Umthamo we-tank uvame ukuba ngaphakathi kwama-litha angu-500–4000 kuya kwezezimali zemisebenzi nezikhala zamafuthi. Izigaba zokukhetha zifaka phakathi umoya ophansi ohlangene oludingekayo nemfutho; ukwakhiwa kokukhuthaza (ukuphakathwa kwe-siphonic, ukufinyelela ku-diesel fuel); imvamisa yaso sokusebenza isikhathi; imikhawulo yokuhamba kwemvelo (izinga lokuhamba, imithetho yokukhishwa); kanye nokutholakala kwezinsizakusebenza zokukhulisa. Abakhiqizi bacaca kakhulu ukukhetha izixhumi ukuze bahlangabezane nemikhawulo yokuhamba nokukhuthaza amandla amathuluzi aphakeme, umthamo weta ngempela ukuze kube nokungaguquki kwemiphumela yokugqamisa, kanye ne-capacity ye-aftercooler eyanele yezozimali eziphezulu noma ezihlinzekwa ngamanzi. Ukwethembeka kwemishini nokuqinisekisa ukuxhaswa kwezinsizakusebenza kubalulekile kumaphrojekthi amade. Ukuhambelana kwemishini ngokuvamile kuhlobene ne-ISO 1217 (ukuhlala komoya ophansi), EN 12922 (ukuphepha kwezixhumi zomoya), nezindinganiso zikazwelonke ezikhona. Imishini ye-diesel kufanele ihlangabezane nemithetho yokukhishwa ethile (Isigaba V eYurophu), ngenkathi umoya ophuma uvame ukuhamba ngaphansi kwemikhawulo yamasayithi wokwakha (80–85 dB(A) ngemuva kwesikhala esingu-1 meter). I-Certification yomthombo wokucindezelwa kanye nezidingo zokuhlola ezikhawulelwe zilandela i-PED (Pressure Equipment Directive) noma izinhlelo zikazwelonke ezifanayo.
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