Tunnel Forms

What is Tunnel Forms?

Definition of Tunnel Forms in Construction

Tunnel framing is a forming technique used on high rise buildings. The tunnel framing method uses formwork that looks like a tunnel. These forms are moved around the jobsite via cranes and are used to form both the walls and ceilings of multi story structures. The tunnel framing technique has been used in Europe extensively and there are several developers and builders that are starting to use the technique in the United States. The use of the tunnel forms require substantial space alongside the perimeter of the structure due to the need to shift the forms off the footprint of the structure and lift them to the next level of construction. The ends of the structure must be kept open to allow the movement of the forms. This eliminates the use of tunnel forms on very logistically tight projects. The tunnel forming system is a a very efficient and economical method for constructing a concrete structure. By placing the walls together with the ceiling, the need for scaffold or floor support is eliminated. In addition, the fire rating of the structure is enhanced by the use of concrete for the walls. The technique is definitely a skill that is improved upon experience and use of the forms. Many contractors, once they have experienced the method become very efficient and expert at its application.