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Tunnel Bags

ULO has installed a number of specially designed and manufactured fabric formwork bags into tunnels which, when grouted, form water seals in the annulus between inner and outer tunnel pipes or, a full diameter tunnel cofferdam/plug.

The unique fabric, developed by ULO for its fabric formwork products, makes tunnel bag applications very effective as its ability to expand to produce a tight fit against the tunnel perimeter when the grout is injected and the bag fills to capacity. Once the grout has cured, the plug or seal becomes a permanent feature of the tunnel structure.
Several examples are shown below.

Tunnel-Bag-Illustrations