I-Tunnel formwork iwuhlobo lwefomu yohlobo oluhlanganisiwe, oluhlanganisa i-formwork yodonga lwe-cast-in-place kanye ne-formwork ye-cast-in-place floor ngesisekelo sokwakhiwa kwe-formwork enkulu, ukuze kusekelwe i-formwork kanye, i-tie. ibha yensimbi kanye, futhi uthele udonga kanye ne-formwork ibe yisimo kanye ngesikhathi esifanayo. Ngenxa yomumo owengeziwe waleli fomu lifana nomhubhe ongunxande, ubizwa ngokuthi i-tunnel formwork.