Two cross sectional designs are required with labeling and acurate dimensions of a horse shoe shaped tunnel showing details of reinforced concrete supports.
Cable bolts 20mm dia at 2m spacing along tunnel profile
Wiremesh 4mm dia and 4x4 inches gap in wire strands
Steel arches 210 mmm depth of w200 x 59 steel arches at 2m spacing along longitundal axis of tunnel
Concrete 130mm on top of the wire mesh
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