Izicathulo zamacala (casing shoes) zimele ingxenye ebalulekile ekwakhiweni kwezisisekelo ezijulile nasekusebenzeni kokubhoboza imithombo, zisebenza njengomhlahlandlela kanye nesici sokuvikela ezansi kwemigqa yokufaka izicathulo. Lezi zixhumo ezikhethekile zenzelwe ukuvumela ukufakwa kwezicathulo phakathi kwezilimo eziyinkimbinkimbi futhi ukuvimbela ukuvaleka kwezicathulo ngesikhathi sokungena ezimweni ezihlangene, ezikhashayo, nezindladla. Ngcontext yokuhlasela umhlabathi (soil nailing) kanye nezinye izindlela zokuvuselela umhlaba, izicathulo zamacala zisebenza njengezinto ezibalulekile ezivumela abakontraka ukuba baphumelele ekufakeni amathube ensimbi avikela ngezimo zomhlaba ezihlukahlukene ngenkathi kugcinwa ukujula nokuma kwazo. Ukufakwa kwezicathulo zamacala kudinga izindlela zokubhoboza eziyinkimbinkimbi ezihambisana nezinsiza zokuthuthukisa imigqa yokufaka izicathulo, kufaka phakathi imishini yokubhoboza ethwele efana nemishini yokubhoboza ye-rotary, imishini ye-crawler, kanye nemishini yokufaka izicathulo ekhwalithi ephezulu. Abakontraka basebenzisa izicathulo zamacala ngokuhlanganyela namahhamba aphrinta (vibratory hammers), amahhamba e-diesel, kanye nezinhlelo zokushayela ze-hydraulic ukuze baphumelele ekwehliseni ukushelela nezithiyo njengoba izicathulo zingenela ezimfihlakalweni z Sands ezikhulu, izihlalo eziqinile ze-clay, izindlalifa ezimnandi, nezinye izinto eziphula umhlaba. Umklamo wamasici wezicathulo zamacala kumele uhambisane nezindlela ezithile zokubhoboza — kungaba ukubhoboza kwe-rotary ngokuphuma kwamanzi noma ngaphandle, ukubhoboza ngokuphikisana, noma ukubhoboza nge-sonic — futhi kufanele kube nemandla afanele ukuze kwenziwe kahle ngesikhathi sokushaya nokuphuma. Izimo zomhlaba ezifana nezilimo ezihlangene, izindawo ezinamatshe, kanye nezindlalifa ezingazinzile zifaneleka kakhulu ezinhlelweni eziklanyelwe kahle ze-casing shoe ezivikelayo zombili imigqa yokufaka izicathulo kanye nemishini yokubhoboza. Ukuhlola izinhlelo zomhlaba ezijulile kuhlanganisa ukufakwa kwezicathulo ezihlabayo, ukwakhiwa kwamamicro pilayi, izinhlelo zokunamathela, kanye nezinhlelo zokuhlola izinzwa lapho ukuvikela izicathulo kubalulekile ukuze kufezwe ukujula okuthile nokugcina ukuzinza kwemithombo yokubhoboza. Izicathulo zamacala zivumela abakontraka ukuba basebenze kahle ezindaweni zasemadolobheni lapho kudinga khona ukukhawulelwa komsindo nokuhumushi, njengoba izinhlelo zokuthuthukisa izicathulo zanamuhla zinikeza ukusebenza okuthulile uma kuqhathaniswa nezindlela zokushayela zendabuko. Ijeometri kanye ne-material yeziqathulo zamacala — etholakala ezingeni lokuqina nezimo ezihlukahlukene — ithinta ngokuqondile isivinini sokubhoboza, ukuphila kwezicathulo, kanye nezezimali zephrojekthi. Ezimweni ezinzima zokwakhiwa, izicathulo zamacala ezisezingeni eliphakeme zehlisa ingozi yokulimala kwezicathulo, zinciphisa imisebenzi yokuphinda, futhi zandisa ukukhiqiza kwemishini yokubhoboza yeziqalo ezibizayo. Ukuqokelwa kwezichasiselo zeziqathulo zamacala ezifanele kudinga ukuhlolwa okubucayi kokwakhiwa komhlaba kanye nokuwiniswa phakathi kwabahloli bezikara bezinhlaka ezikhethekile ukuze kuthuthukiswe ukusebenza phakathi kwezakhi zemhlaba ezahlukahlukene ezitholwe ngesikhathi sokwakhiwa kwezizinda ezijulile.
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