Tubular Void Former

Inflatable & Reusable Duct Tube Inflata-Void Hose

Industry Problem

How to create an economical tubular void former for use on concrete segmental bridges to pass post-tension strands and other items through a concrete form while preventing damage to the duct and ingress of concrete grout into the end of the void. Our Inflata Void hose assembly is a real problem solver- easy to use, saves time and money, and is reusable.

The Diebolt Solution

Our Inflata-Void hose is a unique air mandrel assembly that becomes a rigid tubular void form when inflated with compressed air. Inflata-Void air mandrel systems use a rubber compound virtually impervious to the chemicals in concrete. This durability is combined with a proprietary reinforcement to provide controlled and uniform inflation along the entire length of the air mandrel assembly. Custom-engineered thermoplastic hose ends, one with an auto tire style inflation (Schrader) valve, complete the assembly. The thermoplastic hose ends can be field attachable and reusable to augment our product’s value further. Inflata-void air mandrel hose assemblies are often reused hundreds of times.

How to Order:

Call our office. We have 30 years of experience using our void former successfully all over the USA and internationally.

Significant Projects Include:

  • Baldwin Bridge- Spanning the Connecticut River-Old Lyme, CT

  • Bay Bridge-Spanning San Francisco Bay

  • JFK Airport People Mover

  • Sunshine Skyway-Tampa FL area

  • Woodrow Wilson Bridge-Alexandra VA

  • Champlain Bridge-Montreal Canada

  • And many, many other projects.

Inflata-Void Air Mandrel Examples