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(I) General Provisions 1. In the unstable rock formation, the roadway must be supported. Excavation in soft or sandy sand layers, permanent support to the working face, temporary support or special support should be erected. The distance between the support and the working road, the support and the working surface shall be specified in the construction design; when stopping the excavation in the middle, the support must be followed to the working surface in time.
2. Regular inspections should be carried out on all supported shafts. The wellbore of the underground safety exit and the lift personnel shall be inspected at least once a month; the mine roadway with large ground pressure and the mining roadway with frequent personnel activities shall be inspected every shift. The problems detected should be handled in a timely manner and recorded.
(II) Roadway Construction 1. The construction of the inclined shaft and the surface of the roadway shall be carried out in strict accordance with the design, and timely support and masonry retaining walls shall be carried out.
2. The secondary excavation in the cemented backfill shall be carried out after the cemented backfill has reached the specified curing period and strength, and reliable support shall be erected.
3. Maintenance of inclined shafts and flats must comply with the following regulations:
(1) For the repair or enlargement of the roadway, the bracket near the work site should be first reinforced, then the bracket at the work site should be removed, and the temporary support work should be prepared.
(2) The number of brackets to be removed each time shall be determined according to the specific conditions, and the removal of dense brackets shall not exceed two at a time.
(3) Remove the brackets in the soft place, or repair the intersection of the roadway and the severe roofing area. The brackets should be supported or erected between the brackets.
(4) When cleaning pumice , the tool should be operated in a safe place.
(5) When repairing the inclined shaft, the vehicle should be stopped and the warning and obvious signs should be set.
(6) When the single-headway bracket is removed, there shall be no inside.