Amabitsi wokuhlola ama-diameter amakhulu ku-DTH (down-the-hole) hammers ayizinsiza zokubhoboza ezikhethekile eziklanyelwe ukuqala nokuhola ukuveliswa kwemibhobho ezinzima ezimeni ze-geotechnical nezisisekelo ezijulile. Lezi zinsiza zisebenza ngendlela ebalulekile ezinhlelweni zokubhoboza ngokuqhumisa ngokusungula ubuningi bemibhobho obuqondile kanye nokuzinza ngaphambi kokuba kubhujiswe ngokugcwele noma kufakwe imikhono. Amabitsi wokuhlola asebenza ndawonye nezinhlelo zamahhashi e-DTH ukuze akhe imibhobho yokuqala esebenza njengokuhola ezinyathelweni ezilandelayo zokubhoboza, ikakhulukazi ezicini ezidinga ukuhlinzeka ngezindawo zokubhoboza ezinembile nokunembile kokuhlola. Ukusetshenziswa kwamabitsi wokuhlola nezinsiza ezinkulu ze-DTH kubalulekile ezinhlelweni zokunamathela emhlabathini, lapho ukushelelela kwemibhobho okuqondile kuthinta ngqo ubuqotho bokwakha nokwakha okusebenzayo kokufakwa kokugcina. Lezi zinsiza zakhiwe ukuze zihlale zikhona ngamandla amakhulu okuphumelela nezimo zomhlaba ezishisayo ngenkathi zigcina ukuthobela kwemingcele edingekayo ukuze kufakwe kahle imikhono nokwakha umhlaba. Izindlela zokubhoboza ezisetshenziswa namabitsi wokuhlola emakhanda amakhulu e-DTH zihlanganisa ukuphindaphinda okuqhubekayo okuxhunyiwe nezinhlelo zokuphaka ezisusa izincwajana futhi zigcine ukuzinza kwemibhobho esikhathini sokubhoboza. Ubuchwepheshe bokubhoboza ngokuqhumisa be-DTH bubavumela abaphathi ukuthi bangenise kahle ezinkingeni zembifilo zomhlaba, kuhlanganisa nama-clays anokuqiniswa, amatshe adlulelwe isikhathi, kanye nezimo zomhlaba ezixubile eziphikisana nezindlela zokubhoboza ezijwayelekile. Ibhitsi lokuhlola lisungula indlela yemibhobho ezinzile engathuthukiswa noma iguqulwe njengoba kudingekile ezicini zokwakhiwa ezilandelayo, okwenza kube usizo ikakhulukazi ezindaweni zokwakha ezisemadolobheni lapho ukunembile nokuphazamiseka komhlaba kuncane kubalulekile. Ukuhlanganiswa komoya ocindezelwe noma izinhlelo zokuphaka ezisekelwe emanzini namabitsi wokuhlola kubonakala kuqinisekiswa ukuthi kukhishwe kahle izincwajana nokuhlanzwa kwemibhobho, okubaluleke kakhulu ekugcineni ukunembeka kokubhoboza nokuphila kwesikhathi sokusebenza kwezinsiza emsebenzini wokwakha ezijulile. Izinhlelo ezinkulu ze-DTH hammers ezinamabitsi wokuhlola zisetshenziswa ezinhlelweni ezahlukene ze-geotechnical kuhlanganisa ukugcinwa kwezindonga, ukufakwa kwezindonga eziphekte zobufakazi, izinhlelo zokwesekela ezitugwini, kanye nezinhlelo zokuxhaswa kwezakhiwo. Lezi zinsiza zikhombisa ukusebenza okuphumelelayo ezimweni ezinomhlaba ohlukanisiwe noma ohlangene lapho ama-strata omhlaba nokuwa aphezulu edinga izindlela zokubhoboza ezivumelanayo. Ikhono lokusungula imibhobho yokuhlola ngokuqondile kuvumela abasizi ukuthi bakhombe izimo zezindawo eziphakanyiswa, bahlolisise ikhwalithi yamatshe, futhi balungiselele izindlela zokwakha ngokufanele ngaphambi kokuba baqinisekise ukusebenza ngokuphelele kokunamathela emhlabathini noma imikhono. Ekujuleleni kokwakhiwa, ukubhoboza kwamabitsi wokuhlola nge-DTH hammers amakhulu kwehlisa isikhathi sephrojekthi kanye nezindleko ngokwenza kube lula inqubo yokwakha imibhobho futhi kuvumele ukufakwa kahle kwemikhono ezindaweni ezibalwe nezinhlangothi. Ukuthembeka nezici zokusebenza kwamabitsi wokuhlola akamuva kuqinisekisa ukuba nekhwalithi emishubhu elungile, okuphindelelayo kuqhubekisela phambili ukusebenza ngokuphepha i-collapsed soils, ama-embankments aphakanyisiwe, nezinye izinhlelo zokuphucula ezisetshenziswa kunkambo yokwakhiwa kwezikhungo nezinhlelo zokuthuthukiswa kwemhlaba.
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