Construction Time

The tunnel formwork system uses an accelerated method of curing the concrete. Typically, automatically controlled heaters are placed inside the tunnel formwork to accelerate the concrete cur­ing process. After about 14 hours, the concrete reaches a sufficient compressive strength for the formwork to be removed. Other fac­tors attributed to shortening construction time include:

• The use of metal skin plates provides a smooth finish, thus eliminating shoring and finishing of the concrete walls and slabs.

• The floors and walls are cast monolithically, therefore re­ducing time and cost as well as the need for two separate forming systems.

• Faster learning cycle: Once workers become familiar with the cycle, the time for each cycle will be reduced.