29 CFR 1926.913 - Blasting in excavation work under compressed air.

§ 1926.913 Blasting in excavation work under compressed air.

(a) Detonators and explosives shall not be stored or kept in tunnels, shafts, or caissons. Detonators and explosives for each round shall be taken directly from the magazines to the blasting zone and immediately loaded. Detonators and explosives left over after loading a round shall be removed from the working chamber before the connecting wires are connected up.

(b) When detonators or explosives are brought into an air lock, no employee except the powderman, blaster, lock tender and the employees necessary for carrying, shall be permitted to enter the air lock. No other material, supplies, or equipment shall be locked through with the explosives.

(c) Detonators and explosives shall be taken separately into pressure working chambers.

(d) The blaster or powderman shall be responsible for the receipt, unloading, storage, and on-site transportation of explosives and detonators.

(e) All metal pipes, rails, air locks, and steel tunnel lining shall be electrically bonded together and grounded at or near the portal or shaft, and such pipes and rails shall be cross- bonded together at not less than 1,000-foot intervals throughout the length of the tunnel. In addition, each low air supply pipe shall be grounded at its delivery end.

(f) The explosives suitable for use in wet holes shall be water-resistant and shall be Fume Class 1.

(g) When tunnel excavation in rock face is approaching mixed face, and when tunnel excavation is in mixed face, blasting shall be performed with light charges and with light burden on each hole. Advance drilling shall be performed as tunnel excavation in rock face approaches mixed face, to determine the general nature and extent of rock cover and the remaining distance ahead to soft ground as excavation advances.

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United States Code

Title 29 published on 05-Jun-2018 04:21

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 29 CFR Part 1926 after this date.

  • 2018-05-21; vol. 83 # 98 - Monday, May 21, 2018
    1. 83 FR 23534 - Cranes and Derricks in Construction: Operator Qualification
      GPO FDSys XML | Text
      DEPARTMENT OF LABOR, Occupational Safety and Health Administration
      Notice of proposed rulemaking.
      Comments: Submit comments to this proposed rule, including comments to the information collection requirements (described under the section titled “Agency Determinations”), hearing requests, and other information by June 20, 2018. All submissions must bear a postmark or provide other evidence of the date submitted. Informal public hearing: A hearing can be requested by following the procedures listed under ADDRESSES . If a hearing is requested, OSHA will announce the hearing on its website, www.osha.gov, and publish a hearing notice in the Federal Register .
      29 CFR Part 1926