Standard for setting reflective signs of waist line in coal mine roadway

Standard for setting reflective signs of waist line in coal mine roadway;

1, the roadway width of fully-mechanized excavation bolt (cable) and shotcrete support is within the allowable range, which is 0+ 100mm when there is a centerline and 0+200 mm when there is no centerline; With waist line 0+ 100mm and without waist line 0+200mm, the roadway height deviation is within the allowable range. ..

2, roadway help, bottom straight (floor 2m within the scope of concave and convex is not more than100 mm; Help department within the scope of 2m concave and convex is not more than 30mm), without sundry, shunting cavern construction according to the design, warning signs are set on both sides.

3. The working face permanent support and temporary support conform to the requirements of operation procedures, no empty roof operation phenomenon, support in place before succession.

4. The exposed length of metal anchor rod and anchor cable meets the standard requirements (the length of exposed nut of anchor rod is between10-50mm and 50 mm; The FRP anchor rod exposes 3-5 threads of the nut; Anchor cable out of the lock 150-250 mm). The angle of anchor rod (cable) should be perpendicular to the angle of roadway outline or to the cracks in bedding plane and joint surface. Reflective signs are widely used on expressways, so that vehicles can be clearly seen during the day or at night. Reflective signs are common signs in life.