Advancing standards for designing and constructing tunnels with steel fibre reinforced concrete

Santiago’s Américo Vespucio ring road project will transform urban transportation in the city and region with a new expressway. The AVO II phase of the project, includes construction of two tunnels, each 5.2km long, at depths of 23–54m below the existing Metro line 4. Once completed, each tunnel, will house three lanes of traffic, connecting to two previous road projects, and closing the ring.

The challenge

Initially planned for open cut construction, public feedback encouraged the Ministry to pursue mined tunnels that would be less disruptive and more environmentally friendly.

Further pursuing ways to enhance sustainability on the AVO II, the project team considered steel fiber reinforcement for the temporary shotcrete, even when local technical standards, did not yet exist in Chile.

The solution

Working with Subterra, Bekaert oversaw testing of 3D and 4D fibers in situ and at local laboratories.

These results helped to facilitate the creation of the first two steel fiber standards in Chile. The AVO II project is using Bekaert 3D 65/35BG fibers for its temporary shotcrete.

In addition, the testing demonstrated a 35% reduction in CO² emissions when compared to traditional mesh reinforcement. That translates to a 12% cost savings as well.

Talk to an expert

Let’s talk about your project and discover what Dramix® fibers can do for you.

Advancing standards for designing and constructing tunnels with steel fibre reinforced concrete

The challenge

The solution

Projects

Other Projects

Talk to an expert