Typical Work Cycle

Tunnel forms allow for swift erection of a building’s skeleton. Each day a new room can be formed per tunnel for each tunnel form available. The following steps demonstrate the sequence of activi­ties that cover the life cycle starting from the ground level.

Starter Slab and Wall

Construction usually begins with the casting of the ground slab to the desired configuration of the room. Included on the ground slab is a starter wall approximately 3 to 6 in. (76.2 to 152.4 mm) high, providing dimensional accuracy when setting the width of the forms (Figure 4.10).

First Cycle

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Typical Work Cycle

Once the starter slab and wall have gained sufficient strength, the placement of steel reinforcement and the tunnel forms may pro­ceed.