Reducing costs and increasing productivity with the B.Zero Tondo™. Our patented B.Zero Tondo™ Tunnel Support System is a new solution in tunnelling and provides extremely efficient first stage support. B.Zero.Tondo™ are unique tubular steel-arch ribs, filled with pumped concrete in-situ and offering greater structural efficiency than traditional steel-arch supports. Therefore fewer B.Zero Tondo™ arches are needed, reducing costs and increasing tunnel productivity.
Wirand® steel fibre reinforced shotcrete (including the additives Rocksil or Apral as required) is then applied as a primary lining, limiting initial deformation of the gallery.