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Safety protocols for the management of blasting operations in mining&tunneling
The work processes conducted underground in the mine are of paramount importance. Today, the edition of the TDvent will discuss essential precautions for the blasting process within the mine and tunneling to identify any imperfections in your operational procedures.
1. Blasting Management
(1) Drilling Requirements:
1. Prior to commencing work, it is imperative to conduct a preliminary inspection and ascertain the presence of live waste rock at the top.
2. Operators using coal electric drills must possess a thorough understanding of drill principles and master key drilling techniques.
3. When handling drills, personnel should secure them with either a hand or rope; dragging by cable is strictly prohibited.
4. Before utilizing coal electric drills, it is crucial to meticulously inspect for any damage to the casing, looseness of screws, and integrity of cable connections; exposed copper wires must be addressed promptly. Each shift requires testing integrated protection devices on coal electric drills before operation begins.
5. A visual assessment should first focus on waistline alignment; subsequently, outline markings for roadways must adhere to blasting instructions as per specifications provided in blasting charts using appropriate measuring tools marked with yellow mud.
6. During drilling operations, lightly touch the drill pipe against the coal wall before initiating drilling; excessive force or reliance on foot pedals or multiple individuals pushing forward is discouraged.
7. Drillers are required to maintain "three tight" (tight cuffs and neckline) while ensuring clothing fits snugly without gloves or towels extending beyond collars.
8. Coal electric roughnecks must remain stationary during operations; unauthorized personnel are not permitted to operate equipment freely.
9. Operations must cease immediately if abnormal odors arise from working surfaces, temperature fluctuations occur, unusual sounds are detected, or signs of water emerge; if pressure increases within drilled holes during operations—extraction attempts should be avoided altogether.
(2) The transportation of explosives can only be performed by certified blasting workers who shall adhere strictly to regulations when manually transporting explosive materials from storage facilities directly to job sites:
1.The blaster personally transports electric detonators while explosives may only be transported by blasters themselves or under their supervision by other authorized personnel.
2.Explosive materials need containment in non-metallic containers that withstand pressure impacts shocks and static electricity; mixing detonators with explosives in one container is strictly forbidden—explosives cannot be carried in pockets—and upon receipt they should proceed directly towards designated workplaces without delay.
3.No individual shall transport more than 20 kg worth of explosives at once.
(3) Hole depth requirements along with sealing lengths necessitate compliance with these stipulations:
1.For hole depths less than 0.6m no charges nor blasts shall occur unless special conditions warrant shallow-hole blasting where specific criteria apply: each charge limited up-to 150g filled adequately with mud sprayed down prior checking gas concentrations which shouldn’t exceed 1% near blast zones alongside reinforced support checks requiring team leaders present onsite throughout execution maintaining minimum resistance lines above .5 meters respectively.
2.Holes ranging between depths from 6-1m require sealing lengths equating half their respective depths minimally enforced accordingly
3.Should hole depths surpassing over one meter then seal length mandates being no less than half-meter long.