Ubakaki osohlangothini olulodwa wuhlelo lwe-formwork lokusakazwa kokhonkolo odongeni oluseceleni olulodwa, olubonakala ngezingxenye zalo zomhlaba wonke, ukwakhiwa okulula nokusebenza okulula nokusheshayo. Njengoba ingekho induku yokubopha odongeni, umzimba wodonga ngemva kokuphonswa awunamanzi ngokuphelele. Isetshenziswe kabanzi odongeni olungaphandle lwesitezi esingaphansi, indawo yokuhlanza indle, umgwaqo ongaphansi komhlaba kanye nokuvikela umthambeka oseceleni komgwaqo nebhuloho.