1. Uluhlu olubanzi lwemimandla yesicelo
Semi-iinqwelwana ezirhuqwayo zisetyenziswa kakhulu kuthutho lwempahla, ukuhanjiswa kwempahla, ulwakhiwo lobunjineli kunye namanye amacandelo ngenxa yomthamo wazo owomeleleyo wokuthwala kunye nokuzinza okulungileyo. Ingakumbi-kuhambo olude kunye nothutho lohola wendlela, isiqingatha{3}}iitreyila ziphumelele ukuqondwa ngokubanzi kunye nendumiso ngokusebenza kwazo okuphezulu kunye nokhuseleko.
2. Iingenelo ezibalulekileyo
1 Oku kwenza ukuba isemi{4}}itreyila ibenemfezeko ephezulu yothutho kuthutho lolungiselelo kwaye icuthe iindleko zothutho.
(2) Uzinzo oluhle: Uyilo lwee-semi{1}}ezirhuqwayo luqwalasela ngokupheleleyo imiba yozinzo ngexesha lokuqhuba. Ngokusebenzisa i-counterweight counterweight kunye nesetingi zokunqunyanyiswa kwenkqubo, i-semi{3}}iitreyila zinokugcina uzinzo olulungileyo kwizantya eziphezulu kunye neemeko ezintsonkothileyo zendlela, ziqinisekisa ukhuseleko lokuthuthwa kwempahla.
3 ISemi-ikhompatimenti zetreyila ezinobude obahlukeneyo kunye nobubanzi zinokuhlangabezana neemfuno zothutho lwemithwalo eyahlukeneyo. Ukongeza, ii-semi{5}}ezirhuqwayo zinokudityaniswa neentlobo ezahlukeneyo zeetrektara ukuphumeza indibaniselwano yezothutho ezahlukeneyo.
(4) Ukugcina lula: I semi{1}}itreyila inesakhiwo esilula nesicacileyo, esilungele ukuhlolwa nokugcinwa kwemihla ngemihla. Oku kwenza ukuba isiqingatha-itreyila igcine imeko entle yokusebenza ngexesha lokusetyenziswa kwaye yandise ubomi bayo benkonzo.