Steel Reinforcement Placement
The steel reinforcement may be placed before or after the tunnel forms are placed. When placed before the forms, the steel reinforcement for the walls is erected first, followed by placement of the tunnel form and finally the slab reinforcement. The second method uses preassembled sections of reinforcing steel for the walls and slabs. Once the forms are in place, the preassembled sections are lowered in place. Door and mechanical blockout, as well as electrical equipment, can be installed at this time.