I-tunnel formwork luhlobo lohlobo oludibeneyo, oludibanisa i-formwork ye-cast-in-place wall kunye ne-formwork ye-cast-in-place floor ngesiseko sokwakhiwa kwe-formwork enkulu, ukwenzela ukuxhasa i-formwork kanye, ukubopha. intsimbi yentsimbi kanye, kwaye ugalele udonga kunye nefomwork ibe yimilo kanye ngexesha elinye. Ngenxa yokuma okongeziweyo kolu luhlu lufana netonela elixande, libizwa ngokuba yitonela formwork.