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accident prevention adequate Ammonium nitrate barricades blade blasting blasting caps bracing brake bucket building cable center to center clean cofferdam concrete considered as arising construction contractor course of employment crane Crossbraces danger derrick devices drum electric employee engine equipment explosives factor of safety fastened feet fire extinguishers flagman flammable liquids flash point floor foot foreman gases gasoline guard rails handling hoist Illustration inches inspected installed instructions June ladders lifting lights load located machine material metal minimum nails National Safety Council operator person personnel pile plank platform powder actuated tools proper protection recommended removed repair rip saws safe safety safety engineer scaffold Section securely shoring side signal signs slings steel storage stored Stringers structure timbers for depths timbers spaced tion traffic trench truck unloading Uprights vapors vehicles walkways weight welding wire rope workmen worn