21.75-27 / 2.5 Rim kwimigodi engaphantsi komhlaba

Iivili eziphantsi komhlaba zizinto ezikhethekileyo zeentlobo zamavili ezenzelwe ukuba basebenzise kwimigodi engaphantsi komhlaba kunye nemisebenzi yokuphumelela. La mavili anikiwe ukumelana neemeko ezinobunzima kunye nocelomngeni ezifumaneka kwiindawo eziphantsi komhlaba, kubandakanya neendawo ezirhabaxa, izixhobo zokuphemba, kunye nezithuba ezivaliweyo. Kukho iintlobo ezahlukeneyo zeevili eziphantsi komhlaba, nganye isebenze ngeenjongo ezithile kwimigodi kunye nemisebenzi yokuphumelela. Eminye imizekelo eqhelekileyo ibandakanya: 1. Amavili ezilori ayilenzelwe ukuba athwale imithwalo enzima, anikezele ngenkani indawo engalinganiyo, kwaye ukuxhathisa impahla kunye nokukrazula kwizixhobo ezizonakalisayo. I-2. Amavili kwezi zithuthi aqinile kwaye aqine, ebavumela ukuba bakwazi ukujikeleza iindlela ezixineneyo nezingalingani. I-3. ** I-Tunnel Boring yoMatshini (i-TBM) ivili **: I-Tunnel Countring yomatshini omkhulu osetyenziselwa ukuqhuba imijelo kwimigodi nakwiiprojekthi zokwakha. Amavili koomatshini enzelwe ngokukodwa ukuphatha imikhosi enkulu ebandakanyekayo ekutshweni nasekuchaseni ubume belitye kunye nomhlaba abadibana nabo. I-4. Amavili kwiinkqubo zokuhambisa zenzelwe ukuxhasa imithwalo enzima kwaye ibonelele ngentshukumo egudileyo kwiindlela zokuhambisa. I-5. Amavili kwezi zithuthi zenzelwe ukuba isebenze kwiingoma ze-gage-gaiges kwizithuba ezivaliweyo. Amavili angaphantsi komhlaba adla ngokwenziwa kwizinto ezinamandla ezinamandla, njengentsimbi okanye i-alloy, ukumelana neemeko ezifunwayo phantsi komhlaba. Banokuxhotyiswa ngamanqaku ongezelelweyo afana nokuncitshiswa kwemali, iingubo ezikhethekileyo, okanye unyango lokufumana ubushushu ukonyusa ukuqina kunye nokusebenza kwabo. Ngenxa yendawo enomngeni kunye nokuqwalaselwa kwezokhuseleko kwimigodi engaphantsi komhlaba kunye nokutsalwa, uyilo nolwakhiwo lwamavili aphantsi komhlaba kubaluleke kakhulu ekuqinisekiseni imisebenzi eqhubekayo kunye neyokhuseleko kula mashishini.