Zideh Tunnel in Slovenia is the testing ground for Atlas Copcos latest Boodex system which uses an expanding drill head to install grout tubes into loose rock. In effect the system is a sophisticated forepoling technique to create a stable arch in the ground ahead and above the face of a tunnel.
The rotary bit cuts an oversize hole so that the grout tube can be advanced into the ground close behind, maintaining the drill hole in loose material and fitting within the bore where the bit passes through solid rock. Contrarotation disengages a cam within the drill head so that the cutter bit folds down and can be withdrawn and recovered before grout is pumped in. Zideh Tunnel is being driven by local contractor RGD and is part of 22km of tunnelling on the motorway project linking Llubljana and Maribor parallel to the north western border of Slovenia.
Boodex hardware will be on show at Bauma along with complete rigs such as the ROC F7 heavy crawler machine for quarry work and the ROC 642 which is intended for a variety of lighter rock cutting uses in quarries or on construction sites.
Also new is a range of hydraulic breakers with single piece castings for the body designed to cut down noise.