Ukuphakama okukhulu kwe-Down-The-Hole (DTH) hammering kubonisa indlela ebalulekile yokubhola nokwenza iziqiniseko emkhakheni we-soil nailing kanye nokuzinza komhlaba emkhakheni wezakhiwo ezijulile. Ama-DTH hammers alwa nemishini yokucindezela ye-pneumatic noma ye-hydraulic ethumela amandla ngqo kumtshina wezinto zokubhola nge-hollow drill string, kuvumela ukubhola ngokuphumelelayo ezimweni ze-geological ezinzima futhi kuvumela ukubhola nokuqedwa kwe-soil nails, ama-anchors, nezinto zokweseka ngesikhathi esisodwa. Le ndlela ibalulekile ikakhulukazi ezinhlelweni zokweseka umhlaba zedlulelwe kanye nezikhathi ezinzima, ukuthuthukiswa kwemidlalo, kanye nezinhlelo zokulungisa ukubhujiswa komhlaba lapho izindlela zokubhola ezijwayelekile zingase zinganelekile noma zibe nezinkinga. Le ndlela ixuba ijubane nokunemba kokucindezela ngaphakathi komhlaba nezinhlelo zokwenza umkhawulo zanamuhla, iyenza ithuluzi elibalulekile kwabangeni bezisekelo, onjiniyela be-geotechnical, kanye nochwepheshe bokuzinza komhlaba abasebenza ezindaweni ezahlukahlukene zezemvelo nezemifino. Ukusetshenziswa kwamahammer we-DTH amakhulu ekwakhiweni kwe-soil nailing kuhlanganisa ukufakwa kwama-elementi okuqinisa ezithombeni ezibalulekile nasezindaweni ezijulile ukuze kudalwe uhlelo lwe-soil-nail oluhlanganisa imithwalo ngokuqinisa kwe-frictional resistance kanye ne-mechanical interlock. Abaphakeli basebenzisa la mathuluzi ukufaka ama-soil nails anobubanzi obuvamile obuphumile phakathi kuka-25 no-60 millimitha, behlisa ezindaweni zomhlaba eziphansi noma eziqhamukayo, amatshe aphukile, nezendlalelo ezingazinzile. Ama-DTH hammers abakhona ezimeni ezixubile, ezindaweni ezinesisindo, amatshe athile, namathuba okuhlangana, eguquguqukayo ezimweni ezihlukahlukene zomhlaba ngaphandle kokufuna ukujikeleza okwandayo kwe-drilling fluid ezinhlelweni eziningi. La mathuluzi axhunywa kwezinto zokubhola ezithile, ama-DTH bits, nezinhlelo zokufaka ukuphatha i-borehole ngenkathi kudluliswayo amandla okucindezela adingekayo ukuze kuqhubeke ngaphakathi kwi-geology enzima yangaphansi. Izimo zomhlaba ezifana nezihlahla eziqinile, izihlahla, ama-clay anama-cobbles aphumelelayo, kanye namatshe aphukile ahlinzeka ngezimo ezihamba phambili lapho ubuchwepheshe be-DTH buveza ukusebenza kahle okungcono uma kuqhathaniswa nezindlela zendabuko zokubhola. Izicelo zokwakha emadolobheni, ukwesekwa okuphezulu kwe-dig, ukuthuthukiswa kwesikhashana se-slope, kanye nokufaka izakhiwo eziphelele kuxhomeke kakhulu kumasistimu we-DTH amakhulu. Ukuvuselelwa kwezimoto ze-highway kanye ne-railway, izindonga zokweseka ezi-deep basement, ukuvimbela ukuthuthumisa, ukwakha izindawo zomdabu ecaleni kolwandle, kanye ne-engineering ye-slope yokuhweba konke kusebenzisa la mathuluzi njengendlela ephambili yokwengeza umhlaba nokudlulisela imithwalo. Ukuxuba izinga lokubhola elisheshayo, ikhwalithi ye-borehole emangalisayo, kanye nokuhlanganiswa kahle nezinhlelo zokufaka i-nail kwehlisa isikhathi sonke somsebenzi ngenkathi kugcinwa ukuheha kwe-geotechnical. Imishini kuleli qembu ifaka ama-assembly we-DTH hammer aphelele, ama-drill bits akhethekile aphakathi kwemiphetho ye-button kuya kumakhoneni, ama-giide tubes, izinhlelo zokufaka, kanye nemishini ye-hydraulic noma ye-pneumatic ehlelwe ngokukhethekile ukuze kwenziwe imisebenzi yokubopha umhlaba. Izinhlelo zakamuva ze-DTH zinikeza izilinganiso eziguquguqukayo kanye namandla okucindezela, zivumela abaphakeli ukuba bahlanganise ukusebenza komsebenzi we-drilling ezimfanelo ezithile zomhlaba nezamatshe okuhlangabezana nazo ngesikhathi sokuhlola nokusebenza kokuthula.
Ukukh drilling nge-DTH (Down-The-Hole) hammer enkulu kumelwe kube ingxenye ebalulekile yokwakha izisekelo ezijulile zanamuhla, ikakhulukazi kumaphrojekthi adinga amazinyo amakhulu we-borehole kanye nezixazululo ezinkulu ezithwele umthwalo. Le msebenzi ihluke kakhulu ifaka phakathi ukudrila nokumba ama-boreholes amakhulu ngendlela yokusebenzisa ubuchwepheshe be-DTH obusekelwe ekuphazamiseni, okuhlinzeka ngogesi lokuhlasela ngqo ebusweni be-drill bit ngomechanism ye-hammer ephansi. Ama-hammers amakhulu e-DTH akhiwe ngokuqondile ukuze angene ezindaweni eziqinile zomhlaba, amatshe aphelile, kanye nezakhiwo ezibucayi ze-badrock ezijulile, okwenza kube ngaphezulu okubalulekile emsebenzini wokwakha ama-pile, ukudrila ama-caisson, kanye namaphrojekthi okuzinza komhlaba. Le ndlela ibalulekile ezindaweni zasemadolobheni nasezindaweni zokwakha ezigcwele lapho isizungu sokuphazamiseka kwemikhondo kufanele sincishiswe ngesikhathi kugcinwa ukunemba kokudrila kanye nokusebenza kahle. Lezi zikhala zisebenza ngokuguqula ingcindezi ye-hydraulic kanye ne-pneumatic energy zibe yizihlaseli ezisheshayo eziphula futhi ziqhekeze izinto ezingaphansi komhlaba, ezisuswa ngokuphindaphindiwe kokuhamba okuphuzile kokuhamba kwamanzi okudlula nge-compressed air, kuya ngezimo zomhlaba kanye nezidingo zephrojekthi. Izicelo zokukh drilling nge-DTH hammer enkulu zifaka phakathi izigaba ezahlukene zokwakha izisekelo, kuhlanganisa ukudala izisekelo ezijulile zesikhala, ama-pile amakhulu anemigomo ethile phakathi kuka-1.5 kuya ku-4 meters noma ngaphezulu, nokwakha izindonga zokuhlola izisekelo ukuze kusekelwe izakhiwo eziphansi. Le ndlela yokudrila ibalulekile emaphrojekthini adinga izisekelo ezijulile ezihamba phansi kwendawo ephathekayo yokuphazamiseka noma kube kakhulu lapho ama-casing avamile nomjovo we-kelly-bar ebonakala engasebenzi. Lo mshini osebenza kahle kakhulu ezimweni ezinzima ze-geological ezifana ne-gravels eziqinile, ama-cobbles, izendlalelo ezihlotshisiwe, amatshe aphukile, nezindawo zokumba ezihlanganisiwe lapho ukudrila kwe-augular okujwayelekile noma izinhlelo ezijikelezayo ziba nemikhawulo yokukhiqiza. Ama-hammers amakhulu e-DTH angafinyelela izinga lokudrila elingu-2 kuya ku-6 meters ngehora kuya ngokuya ngekhono lamatshe, ubhardness bezakhiwo, kanye nespecifics ye-hammer, okuhlinzeka ngezixazululo zokudrila ezikhuthele ezinciphisa isikhathi sokwakhiwa kwezisekelo. Abasebenzisi kanye nabadayisi abathumela ama-hammers amakhulu e-DTH kufanele bagcine ukwazisa izimo zomhlaba ngokusebenza kwangaphambi kokudrila, ukuhlola isimo se-geological, kanye nohlu lwe-geotechnical ukuze baphakamise usayizi we-hammer ofanele, ukukhetha ibit, izincazelo ze-drilling fluid, nezinga lokuhamba. Ukuzinza kwe-borehole kanye nokuphathwa kwe-drilling fluid kubaluleke kakhulu ezinhlelweni ezinkulu ze-DTH, ikakhulukazi emhlabeni obuthaka noma ezimo ezingazinzile lapho izinhlelo ezifanele zokusekelwa—njenge-bentonite slurry enesisindo noma i-casing yesikhashana—kubalulekile ukuvimbela ukuwa kwe-borehole kanye nokugcina ukuma okuqondile. Le teknoloji ihlanganisa kahle nezinsiza zokwazisa ezihamba phansi, ukufakwa kwe-piezometer, kanye nezinhlelo ze-quality assurance eziqinisekisa ubuqotho be-borehole ngaphambi kokufakwa kwe-cage ye-pile kanye nezenzo ze-tremie zama-concrete. Izinsiza zokudhila nge-DTH hammer enkulu ziqhubeka nezinto ezihlanganisa izikhala zokuthola ezibekwe kumahhashi ezitrobhu zefektri kuya kuzinhlelo eziphathekayo ezikwazi ukusebenza ezindaweni ezikwazi ukhululiwe ngendawo encane, ukuqinisekisa ukufaneleka ezindaweni ezihlukene zephrojekthi kanye nezinqaba zamaphrojekthi phakathi nezinyathelo zokwakha izisekelo.
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.
Izigubhu ze-Ring zimele amathuluzi abalulekile wokusika emsebenzini yokubhoboza ngezinga elikhulu, ikakhulukazi emkhakheni wobunjiniyela bokwakha izisekelo ezijulile kanye nokwakhiwa kwezobuningi. Lezi zinsiza zokubhoboza ezikhethekile ziyingxenye ebalulekile yezinhlelo ze-DTH hammer ezisetshenziselwa ukumba izimbobo emlandweni onzima wezemvelo nezigodi. Izitsha ze-Ring zinefomethi yokusika eyindilinga enezinsiza zokusika ze-tungsten carbide noma zensimbi ezihlelwe ngaphandle, okuvumela ukungenelela kahle ezindaweni ezinzima zomhlaba ngenkathi kugcinwa izilinganiso ezicacile zezimbozo. Ngokuhambisana nokwakhiwa kwezisekelo, izitsha ze-Ring zenza kube lula ukumba izimbobo ezinkulu ezidingekayo ukuze kufakwe izikhala ezithunyelwe, ama-caissons, kanye nezisekelo ezincane ezisekela amaphrojekthi amakhulu. Ukusebenza kwezitsha ze-Ring kuthinta izindlela eziningi zokwakha izisekelo ezijulile, kuhlanganisa ukumbiwa kokujikelezisa, ukumbiwa ngokushaywa ngezikhangiso ze-DTH, kanye nezindlela zokuhlanganisa zokujikelezisa-nokushaywa. Uma zisetshenziswa nezinhlelo ezilungile ze fluid yokubhoboza nezinsiza ezisizayo, izitsha ze-Ring zenza kube nokwenzeka okungaguquguquki kokungenelela kwezimbobo kanye nokunemba kokulinganisa okubalulekile ukuze kugcinwe ubuqotho bezisekelo. Lezi zinsiza zisebenza kahle emaphrofayilini ahlukahlukene omhlaba, kusuka ezimbanjeni ezidinga ingcindezi yokubhoboza ephansi kuya kumaklayi ahlanganisiwe kanye nezindonga ezibuthakathaka ezidinga ukusika okuhlosiwe. Ukukhetha izincazelo zezitsha ze-Ring - kuhlanganisa nezinga le-tungsten carbide, ubukhulu besikhumba sokusikayo, kanye nomklamo wesisekelo sensimbi - kumele kuhlangane nezimo zangaphansi ukuze kuthuthukiswe ukusebenza kahle kokubhoboza nokuphila kwezinsiza. Ezimweni zokusebenza ezinkulu ze-DTH hammer, izitsha ze-Ring zisebenza ngokubambisana nezinsiza zamandla amanzi, ama-drill rods, kanye nezinhlelo zokuhamba ukuze zisuse okumbiziwe futhi zigcine uzinzo lwezimbozo ngesikhathi sokubhoboza izisekelo. Izitsha ze-Ring zenze imisebenzi ebalulekile ekuhloleni izinzwa, ekubhobozweni kwezimbobo zokuqinisekisa izimbobo ezihlisiwe, nasekubhobozweni kokukhiqiza izakhi zezakhiwo. Ukusebenzisa kwazo kuvumela abafaki zicelo ukuba bathuthuke izimbobo emhlabeni ohlanganisa ukujula komhlaba okungaguquguquki, izindawo ze-adak, nezindonga eziqinile ezizokwenza kube nzima izindlela zokubhoboza ezijwayelekile. Imiklamo ekhethekile ye-ring bit iyahambisana nezimo ezithile ze-lithological: amafomu ethambile ajabulela izitsha ezivulekile ezithuthukisa ukuhlinzekwa kokumbiziwe, kuyilapho izindonga ezinzima noma ezinqunyiwe zidinga izitsha ezikhazimulayo ezinezingqimba ze-tungsten carbide eziphakeme. Ukusebenza kahle kokubhoboza kwe-ring bit kuthinta ngqo izinhlelo zephrojekthi kanye nokuphathwa kwezindleko zezisekelo, ikakhulukazi ezimweni zokubhoboza ezijulile lapho izinga lokukhiqiza izimbobo lihambisana nemigomo yokwakha jikelele. Ukugcina kahle kanye nezinhlelo zokubuyiselwa kwe-ring bits kubaluleke kakhulu emisebenzini yokuphathwa kwephrojekthi. Izindawo zokusika ezigugile noma ezilimazekile zinciphisa ukusebenza kahle kokubhoboza, zikhuphule ingcindezi yokusebenza, futhi ziphazamise izinhlelo zokuhlala kwezimbobo. Ukuvumelana kwezinto ze-ring bit, okuhlanganiswe nezinsizakalo ze-professional bit rejuvenation ezinikeza ukushintshwa kwe-carbide kanye nokuhlolwa komzimba wensimbi, kuveza indlela yokuphatha izindleko zokubhoboza ezinhle kubafana basebenzelana nezinkinga eziningi zezisekelo. Ukuhlanganiswa kweteknoloji ye-ring bit nezinhlelo zokuhlola zesimanje kuvumela ukulandelela okukholisayo kwezimpawu zokubhoboza ngesikhathi sangempela, kukhuthaza amasu okumbiwa ahambisana okukhulisa ukusebenza kwezinsiza kanye nokuhlala kwezimbobo kuzo zonke izigaba zomsebenzi wezobunjiniyela.
Ibhithi enezigaba ezingathwalwa ifanekisela ubuchwepheshe obukhethekile bokubhoboza obubalulekile bokubhoboza obukhulu be-diameter ngaphansi komhlaba (DTH) bokuphuma kwethusi ezinhlelweni ezinzima zokusebenza kwezimiso zokwakha nezizinda. Lezi zibhithi ezithuthukisiwe zinezingxenye ezivulekile zokusika ezingenziwa zanda ngesikhathi sokubhoboza futhi zibuye zibe nezinzuzo zokuhoxisa kahle emholes, zenza kube nemigomo ecacile yokubhoboza ngaphezulu kwezimo ezixakile zomhlabathi, i-rock ebhujiswe, nezimo ezihlangene ezvamanda ezijwayelekile emsebenzini wezizinda ezinjini. Ukuklanywa okususwayo kuvumela abakhiqizi ukuba bartheze isivinini sokubhoboza kanye nekhono ngenkathi kugcinwa izinga eliphezulu lokuphuma komhubhe kanye nezimo, okubalulekile ezinqubweni zokubhoboza umhlabathi, ukufakwa kwezikhala ezincane, kanye nezinhlelo zokubhoboza ezinkulu. Ngokusho kwezimo ezithile zomhlaba ngesikhathi sangempela, lezi zibhithi zinciphisa isikhathi sokusebenza kanye nezindleko zokubhoboza ngenkathi zithuthukisa ukuphepha kanye nokunemba ekwakheni izizinda. Ubuchwepheshe bokubhoboza obusebenzisa ibhithi enezigaba ezingathwalwa buhlanganisa amandla wokuphuma kwe-DTH hammer nezinhlangano zokulungisa zezingqimba zokusika ukuze kudlulelwa ezisemazingeni ehlukeneyo nasentwasahlobo yomhlaba. Abasebenzi bangathanda izingxenye ukuze kuqukethwe ububanzi obukhulu nokufika okuqondile emalungwini anzima njenge granite, limestone, nezindlalifa zecement, bese bezaabuyisela emuva lapho behamba phakathi kwezinto ezithambile ezifana ne-clay, silt, nezimfunda ze-sand. Lezi zinguquko zikhombisa ukwethenjwa ezinhlelweni zokuhlola umhlaba, ukubhoboza ama-caisson, kanye nokufakwa kwezikhala zokuphela lapho izinga lokufika eliqhubekayo nemiphumela yebhithi ibaluleke kakhulu. Izigaba ezithwalisakele futhi zisebenza kahle ekukhishweni ngokusebenzisa ama-casing wesikhashana nezimo ezinzima zokubhoboza, zinciphisa ingozi yokubamba ibhithi futhi zinciphisa umonakalo wombhobho wezinsiza zokubhoboza kanye nomhlaba ozinzile ophakeme. Izicelo zezigaba ezithwalwe ibhithi ziqhubeka kuhlu oluphelele lwezobunjiniyela bezizinda ezijulile, kusukela ekwenzeni izakhiwo ezisebenzayo nasezinhlelweni zokuhlola umhlabathi zokutholwa kwezinhlelo zokubhoboza kuze kube sekuthatheni izingxenye ezikhokhelwayo ezimangalisa, izakhiwo eziphakeme, kanye nezinsizakalo ezibalulekile. Lezi zibhithi zikhombisa ubuchwepheshe ekwenzeni umhlaba lapho kubalulekile ukubhoboza kahle phakathi kwezindawo zomhlaba nezindonga, njengoba kusebenza ekwakheni izindonga zokuhamba, iziqeshana, kanye neziphila ezinkulu ezidinga umhubhe ocacile, ozinzile kuzo zonke izinkomba ezichaziwe. Abakhiqizi abasebenza ezindaweni ezehlukene ze-geo-logical ezineqembu lokuhlanganiswa komhlaba ne-rock, njengezindaweni ezishunqayo ezibomvu ngaphansi komhlaba noma endaweni yokugcina ye-glaciated enezinhlaka ezinqwabelene, babezuza ekuqhubekiseleni phambili ukuphumelela kokubhoboza nezinga elihamba phambili elilethwa ubuchwepheshe bebhithi enezigaba ezithwalwe. Lezi zibhithi zihambisana nezinyathelo ze-DTH hammer eziyindilinga ezivela kumamodeli aphezulu ubukhulu, okuvumela ukuhlanganiswa okungabizanga ezinsizeni zokubhoboza ezikhona ngenkathi kuthola uzuza okuthile ekuphuculweni kwamazinga, ubuxhakaxhaka bomhubhe, kanye nokuphila kwezinsiza. Ukukhetha okukhona kwezincazelo zezibhithi ezithwalwe kufanele kuhlukile uvivinywe ukufaka isimo somhlaba, ubude obahlukene bokubhoboza, ububanzi bemhubhe, kanye nemithetho ethile yokumelana nezindonga nezithombe. Abanye ababhali bokwakha kanye nabahlola umhlaba bahlanganyela ukuze kuvunyelwe ukwakhiwa kwabithitha, ukukhetha ibhithi, nezimo zokusebenza—kufaka phakathi izinga lokuhamba kwamanzi, umfutho wezwi, nokujikisa—ukuze kufezekiswe izinjongo zokubhoboza ezithile zenhlangano ngenkathi kugcinwa ukwethembeka kwezinsiza nezindinganiso zokuphepha. Ukutshalwa kwe-premium retractable segment bits kuyinzuzo ngezikhathi zokubhoboza ezincane, ekufuna izibonakude, kanye nezakhiwo ezinzima ezibhekisela kwezenzakalweni ezithinta ukuphakama komnyango, indlela yokwakha, kanye nezindleko zomsebenzi omkhulu emakethe yokwakha eyalimelayo.
Izigaba zebhithi zibalulekile njengezinsiza zokugaya ezisetshenziswa ezinhlelweni zokugaya nge-hammer ezinkulu (DTH), zigcina umphakathi obalulekile ekwakhiweni kwezinhlaka ezijulile nasezinhlelweni ze-geotechnical. Lezi zifaki ezishintshwayo zifakwe entanjeni yebhithi yokugaya futhi zisetshenziswa njengendawo yokugaya eyinhloko phakathi kwezinsiza zokugaya nezakhi zofuzo phezulu komhlaba. Ngokuqondene nemisebenzi yeziqalo ezijulile, ikakhulukazi lapho kubhekwa izinhlelo zokusebenza zesilinganiso somhlabathi nezidingo zokugaya ezinkulu, izigaba zebhithi zakhiwe ukuze zikwazi ukumelana nezimo ezinzima zokuphuca, izinto ezahlukahlukene, nezimo zomhlaba eziguquguqukayo ezitholakala ngesikhathi sokwakhiwa kwemigodi. Ikhwalithi nekhono lezigaba zebhithi zithinta ngqo ukusebenza kahle kokugaya, izindleko zokusebenza, kanye nokuphepha kwezinhlelo zokwakha izisekelo. Abakhi abasebenzela ukushayelwa kwephahla, ukufakwa kwemicropile, nezinye izinhlelo zokwakha ezijulile bathembele ezigabeni zebhithi ezisebenza kahle ukuze bagcine ukukhiqiza ngenkathi behlisa kwizendlalelo zomhlabathi ezinzima, itshe elizoshintsha, izitini eziphukile, kanye nezinqubo ezihlanganisiwe zokwakha ezivamile ezindaweni zokwakha ezinzima. Ukukhetha nokusebenza kwezigaba zebhithi kuhluke kakhulu kuye ngezimo zomhlaba nezindlela zokugaya. Amaphampu e-DTH anezidingo ezikhethekile eziphakeme zezigaba zebhithi ezikwazi ukuhlinzeka nge-fragmentation ye-roc enembile nezinga lokungena ezinhlelweni ezahlukahlukene zobuchwepheshe bokwakha izisekelo. Izigaba zebhithi kufanele ziqinise ukugqoka nokuphuka lapho kugaya ngezinto ezithile ezifana ne-sandstone, granite, kanye nezakhiwo ezihlanganisiwe, ngenkathi zigcina ukusebenza ezindaweni zomhlabathi ezithambile nezimvula zomhlaba. I-geometry ye-profi yezigaba zebhithi—including usayizi wefaka, ukukhala komkhawulo, kanye nesakhiwo se-carbide—kubalulekile ukufanisa izicelo zokugaya ezithile, noma ngabe zisebenza ezimithini eziqukethe ukujula okuqhubekayo noma ezingezinhle ezilindele ukukhetha okuqinile. Abakhi bezisekelo nezinkampani zokugaya ezikhethekile kumele bacabange kahle izimpawu zezigaba zebhithi ukuze baphendule ezimeni ezitholakalayo zomhlaba, kuqinisekisa ikhwalithi ye-borehole efanele nokunciphisa izikhathi ezibizayo zokuphendula ibhithi phakathi kwezinhlelo eziphathelene nezisekelo. Izicelo zezigaba zebhithi emsebenzini wezisekelo ezijulile zifaka imibiko ehlukile yokwakha ehlanganisa ukufakwa kwephahla elikhulu, ukugaya kwe-caisson, ukuhlinzekwa kwesikhwama somhlaba, nezinhlelo zokwenza umhlabathi ezidinga imigodi ejulile. Ukuhlola kwezimayini nokugaya kokuhlola kwezobuchwepheshe kuyathandwa kakhulu ngezigaba zebhithi ze-DTH ukwenza ukususa amasampula amakhona nokwakha imigodi yokuchaza umhlaba. Ukuphila nokwethembeka kwezigaba zebhithi kuthinta ngqo izikhathi zohlelo nezabelomali, ikakhulukazi ezimweni ezinzima zomhlaba lapho izindlela zokugaya ezijwayelekile zikhombisa ukungasebenzi kahle. Njengoba ubuchwepheshe bokwakha izisekelo bukhula kahle kakhulu ngokuqinisa izinhlelo ezijulile nezimo zomhlaba ezinzima, ukubaluleka kwezigaba zebhithi ezisezingeni eliphezulu ezikhiqizwe ngempahla ye-carbide ethuthukisiwe nezakhiwo zokwakha ezenziwe ngokuqondile kuyaqhubeka nokukhula. Ukukhetha abahlinzeki abaqinisekisiwe bezigaba zebhithi ezisezingeni eliphezulu kuqinisekisa ukuthi abathengi bezokwakha bagcina izinga eliqhubekela phambili, kwehlisa isikhathi sokuma ngenxa yokwehluleka kwezinsiza, futhi bafinyelele izinga eliphezulu lekhwalithi ye-borehole elibalulekile ekuwakhiweni kwezisekelo ezijulile eziphephile nezizinzile.
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