Gunited concretes

Until about 1950, the construction of galleries was dominated by wood carpentry; in slow succession were introduced the metallic carpentry, the gunited concrete, the anchorages and finally the systematical use of a combination of those support measures.

The development of gunited concrete technology started with the invention of the "concrete gun", patented in America in 1911; in 1914 the U.S. minerary department began the substitution of wood carpentry with gunited concretes in the experimental mine of Bruceton.  For the first time, in the '20s, appeared the term "method with gunited concrete" which later became a true "construction method"; from then the use of gunited concrete grew larger and larger, and nowadays it's the most common construction method for building galleries. During last years, a growing interest on spritz beton and fiber-reinforced shotcrete has taken place, because it's easy and quick to use, cheap and it improves the safety of workers. It is clear that the quicker is the application of a covering, the quicker will proceed the work.

The employment of gunited concrete strenghthened with steel fibers instead of the traditional reinforcement meshes, grants a quicker work, safer conditions of yard and workers, safety, quickness and lesser costs.

The FIBROCEV technical service is at the disposal of designers, whom it may aid, backed by its own experience, in identifying the optimal fiber reinforcement according to the engineering problems to be solved.