Microdrilling

<strong>ST-60</strong> tunnelling rig project was developed to meet the growing need for sub-horizontal consolidation in large-section tunnels using single-boom equipment working with the full section method as an excellent alternative to the double-boom type system traditionally used for this type of job. The equipment is very flexible and fast to use, also in relation to the importance of the treatments to perform. To reach the maximum heading stroke points with respect to ground level, a special system of thrust blocks and sliding blocks was designed to reach these points in total safety. The machine has a mast for 19000 mm treatments in one pass and 24000 m treatments with matching chuck and optional extensions. The maximum extension height at 0° with respect to ground level is 10700 mm. The variability of the height of the thrust block axis of rotation from 850 mm to 4250 mm combined with the column extension allows a work radius of from 3700 mm to 6500 mm. Tunnel lining is over 180°. Fitted with two motors (diesel and electric) for both drilling and traversing, guaranteeing performance also in case of a breakdown of one of the two units. <strong>The following drilling techniques can be applied using the ST-60:</strong> - Rotation (with or without casing) - Rotopercussion by means of Top Hammer (with or without casing) - Rotopercussion by means of Down the Hole Hammer (with Tubex, Odex or Simmetrix superjews system)