Blasting workers under the most fire shaft should

2022-09-28
  • Detail

Underground blasters should know and be able to

1. Personnel who contact explosive materials above and below the well must wear cotton cloth or antistatic clothes

2. Electric detonators must be transported by blasters in person, and explosives should be transported by blasters or other personnel under the supervision of blasters

3. Explosive materials must be installed in non-metallic containers with pressure resistance, impact resistance, shock resistance and anti-static. Electric detonators and explosives shall not be installed in the same container. It is strictly forbidden to put explosive materials in pockets. After receiving the explosive materials, they should be sent directly to the work place. It is strictly forbidden to stay halfway

6. The underground blasting work must be undertaken by full-time blasters. In coal (rock) and gas (carbon dioxide) outburst coal seams, full-time blasters must be fixed in the same working face

7. The blasting operation must implement the "three inspection system for one shot", and the blaster must carry out the blasting operation in accordance with the instructions

8. Do not use expired or seriously deteriorated explosive materials. The unusable explosive materials must be returned to the explosive material warehouse

9. In the mining face, the coal mine allowable instantaneous power detonator or the coal mine allowable millisecond delay electric detonator must be used. When using millisecond delay electric detonators allowed in coal mines, the delay time of the last section shall not exceed 130ms. Electric detonators produced by different manufacturers or different varieties shall not be mixed and used

10. Millisecond blasting should be used in the mining face with gas or coal dust explosion risk. In the heading face, it should be detonated once in full face. If it cannot be detonated once in full face, safety measures must be taken; In the coal mining face, the explosive can be charged in groups, but each assembled explosive must be detonated at one time

11. It is strictly forbidden to use two detonators to blast at the same time in a coal mining face

12. When millisecond blasting is used in the mining face in the high gas area of high gas mines and low gas mines, if reverse blasting is used, safety technical measures must be formulated

13. Blasters must store explosives and electric detonators separately in special explosive material boxes and lock them; It is strictly forbidden to throw or place it randomly. The explosive material box must be placed in a place where the roof is intact and the support is complete, avoiding mechanical and electrical equipment. When blasting, the explosive material box must be placed in a safe place outside the warning line

14. When extracting a single electric detonator from the bundled electric detonators, it is not allowed to pull the tube body by hand, nor the tube body by hand. The bundled electric detonators should be straightened, and the front-end foot wire should be pulled out. After pulling out a single electric detonator, its foot wire must be twisted into a short circuit

15. When assembling the primary explosive roll, the following regulations must be observed:

①. It must be carried out near the blasting working place where the roof is intact, the support is complete, and the electrical equipment and conductors are avoided. It is strictly forbidden to sit on the explosive material box and assemble the detonator roll. The quantity of detonator roll assembled shall be limited to the quantity required at that time and place

② when assembling the primary explosive roll, the electric detonator must be protected from vibration and impact, breaking the foot wire and damaging the insulating layer of the foot wire

③ electric detonators must be installed from the top of the medicine roll. It is strictly forbidden to use electric detonators instead of bamboo and wooden sticks to pierce the eyes. All electric detonators must be inserted into the cartridge. It is strictly forbidden to insert the electric detonator obliquely in the middle of the medicine roll or bundle it on the medicine roll

④ after the electric detonator is inserted into the medicine roll, the medicine roll must be entangled with the foot wire, and the foot wire of the electric detonator must be twisted into a short circuit

16. Before charging, the pulverized coal or rock powder in the blast hole must be removed first, and then the roll of medicine must be pushed gently with a wooden or bamboo gun stick, which must not be collided or tamped. The rolls in the blast hole must be closely connected with each other. Water resistant explosives should be used in the blast holes with water

calculate the impact energy according to the damage degree of the pendulum to the impact sample. 17. After charging, the electric detonator pin line must be suspended. It is strictly prohibited for the electric detonator pin line and blasting bus to contact with the conductors such as transportation equipment, electrical equipment and mining machinery

18. Water cannon shall be used for hole sealing 4 Flatten the sample and put it into the holder to clamp the mud. The remaining blast hole outside the water cannon mud shall be sealed with clay cannon mud or cannon mud made of non combustible and plastic loose materials. It is strictly forbidden to use pulverized coal, blocky materials or other combustible materials as blast hole sealing mud. Blasting is strictly prohibited for blast holes without sealing mud, with insufficient sealing mud or with false sealing. Exposed blasting is strictly prohibited

19. The blast hole depth and the sealing mud length of the blast hole shall meet the following requirements:

① when the blast hole depth is less than 0.6m, charging and blasting are not allowed; Under special conditions, such as bottom excavation, side brushing, and roof lifting, if shallow hole blasting is indeed required, safety measures must be developed. The depth of the blast hole can be less than 0, and the cutting of the other two samples is required to be strictly controlled 6m, but it must be fully sealed with gun mud

② when the blast hole depth is 0.6 ~ 1m, the sealing mud length shall not be less than 1/2 of the blast hole depth

③ when the blast hole depth exceeds 1m, the sealing mud length shall not be less than 0.5m

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