Is high gas tunnel safe construction?

The following is the relevant content about the safe construction of high gas tunnels brought to you by Zhongda Consulting for your reference.

1. Basic requirements

1. Before gas tunnel construction, a safety production management organization must be established, a safety production responsibility system must be established, various safety management systems must be established and improved, and effective implementation must be ensured . 2. A special construction plan must be prepared before gas tunnel construction; corresponding plans must be prepared. 3. Before construction of gas tunnels, all operating personnel should be trained and given safety education and signed for future reference. 4. During the construction of gas tunnels, a rescue team should be established and equipped with rescue equipment. 5. Gas monitoring should comply with the following regulations: ① A professionally trained full-time tile inspector must be installed at the entrance of a gas tunnel to be responsible for detection records. ②The instruments used to detect gas must be calibrated regularly. All instruments that have been overhauled must pass metrological verification before they can be used. ③ Locations prone to local gas accumulation must be inspected and effective measures must be taken to deal with them. ④ All metal pipelines entering the tunnel must be equipped with effective grounding devices outside the tunnel, and their resistance values ??must comply with relevant regulations.

2. Safety requirements for gas tunnel construction

Gas tunnel construction operations should comply with the following safety requirements: ① When the gas concentration in the air flow on the excavation working face exceeds the relevant specified parameters, work must be stopped. Evacuate the staff, cut off the power supply, and study prevention and elimination measures for treatment. ② If the main ventilator stops operating or the ventilation system is damaged due to temporary power outage or maintenance, after normal ventilation is restored, all areas affected by the wind stoppage must be inspected by inspectors to confirm that there is no danger before production can be resumed. ③ Explosion isolation (suppression) facilities should be installed on the excavation working face of high-gas tunnels.

3. Blasting operations

Blasting operations should comply with the following safety requirements: ① Strictly implement the "three-person chain blasting system" (meaning that the blaster will hand over the warning sign to the team leader before blasting, The team leader sends someone to be on guard to prepare the order for firing, and then hands his or her order sign to the gas inspector. After checking that the gas concentration meets the requirements, he hands the sign to the gunman.) ② Gas working surfaces must use electric detonation, and the use of half-second or second-level electric detonators is strictly prohibited. ③ Blasting at gas working surfaces must use coal mine permitted explosives and coal mine permitted electric detonators. ④ When blasting inside the cave, personnel should evacuate outside the cave. ⑤The charging and filling of blast holes must comply with relevant technical index and parameter requirements. Coal (rock) powder in the blast hole should be removed before charging. ⑥ The blasting busbar should use copper core insulated wires. It is strictly prohibited to use bare wires and aluminum core wires for blasting. The blasting busbars, connecting wires and lightning tube pins must be tightened and hung with each other, and must not be connected with tracks, metal pipes, steel wire ropes, and scraper conveyors. contact with electrical conductors.

4. Ventilation and dust prevention

The ventilator must be installed outside the cave or in the fresh air flow inside the cave to avoid the circulation of dirty air. The ventilator in the gas working area should be equipped with two power supplies and a wind power locking device. When one power supply stops supplying power, the other power supply can ensure the normal operation of the fan in time. Local ventilators near the excavation working face of gas outburst tunnels should be equipped with dedicated transformers, switches, lines and wind power blockade and gas electricity blockade for power supply. When high concentration gas is discharged, safety measures must be taken to remove the gas. The ventilation facilities of gas tunnels should be kept in good condition, and adjustment, relocation, and removal of ventilation facilities should be carried out by dedicated personnel. It is not suitable to stop the wind in the temporary suspension area; when the wind stops, the power supply should be cut off, fences and warning signs should be set up, and no one should enter.

5. Tunnel lighting

1. Lighting and electrical signals should meet the following requirements: ① Low gas tunnels should not be greater than 220V, high gas tunnels and gas outburst tunnels should not be greater than 110V. ② Sealed cables must be used for transmission lines, and bare wires and poorly insulated wires must not be used. ③The lighting appliances in gas outburst tunnels should be explosion-proof. 2. The charging room for the miner’s lamp should be 50m away from the hole. When using lighting such as miner's lamps, if there is any problem, do not use it. 3. It is strictly prohibited to use flame lights for lighting in gas tunnels. Anyone who enters the tunnel must undergo a safety inspection. It is strictly prohibited to bring items that may produce sparks or spontaneous combustion into the tunnel. 4. It is strictly prohibited to temporarily connect lights or other equipment to the cables already laid in the cave. 5. When the cables are connected in the hole, they should be connected in a special explosion-proof junction box or in electrical equipment with an explosion-proof junction box.

6. Fire prevention

The fire prevention work of gas tunnels should comply with relevant regulations. Fire prevention measures must be formulated for the construction of gas tunnels. Operations that generate high temperatures and sparks are strictly prohibited in the tunnel.

Electric welding, gas welding, blowtorch welding and other operations are not allowed in the cave. Corresponding safety measures must be taken when welding is really necessary.

7. Rescue

Gas tunnels should be equipped with first aid and rescue equipment, maintain their good performance and assign dedicated personnel to take care of them. High gas and gas outburst work areas should be equipped with rescue teams. The rescue team must carry out rescue work under unified command, and individuals are strictly prohibited from acting alone.

8. Coal exposure and outburst prevention should comply with the following regulations

①Construction workers must wear self-rescuers. ② When blasting coal seams in the excavation working face, all personnel must evacuate outside the cave. ③Ventilation management should be strengthened and the excavation surface should have enough fresh air. ④ Strengthen geological prospecting and investigation to collect relevant data on adjacent tunnels, mines, etc. ⑤ For coal seams that are not known to have outburst risk, preliminary exploration and gas inspection must be conducted to check whether they have outburst risk. Sufficient safety distance must be ensured during pre-exploration. The specific operations are carried out in accordance with the specific requirements of the "Fa'er Tunnel Prevention and Control Design for Coal and Gas Outbursts". ⑥ When it is predicted that there is a risk of outburst, construction management must be carried out according to the outburst coal seam, and the provisions of the "Coal Mine Safety Regulations" and "Detailed Implementation Rules for Outburst Prevention" must be strictly followed.

9. Construction safety measures

1. Tunnel construction should carefully prepare construction site safety implementation details, comprehensive planning, reasonable arrangements, and standardized command.

2. The implementation construction organization design must be in accordance with the "Specifications", "Safety Regulations" and design requirements, combined with topography, landforms, and hydrogeological conditions, scientifically select construction techniques, and formulate detailed and specific safety technical measures and Continuously supplement and improve during construction, and carefully conduct safety education and technical briefings.

3. For adverse geology and special geology, technical demonstrations should be organized to determine drilling and blasting, excavation, and support plans.

4. Ventilation, lighting, wires, etc. in the cave must be planned in a unified manner, and maintenance must be strengthened to ensure that the layout is neat and in good condition.

5. The construction in the cave should be under the unified command of the leader on duty, and the excavation, lining and transportation operations should be reasonably arranged according to the construction organization design.

6. Blasting design should be made for blasting excavation, and parameters such as peripheral eye spacing, external insertion angle and charge amount should be strictly controlled to reduce disturbance to surrounding rocks and the number of over- and under-excavations.

7. After blasting, special personnel should be assigned to inspect, handle dangerous and hanging rocks, and provide supervision. Only after confirming safety, other personnel are allowed to enter the working surface.

8. Temporary support should be based on the design documents and specifications. Generally, the maximum distance should not be greater than the footage distance of two shots.

9. The grid arch frame and spray-anchor support must strictly control the arch spacing and anchor spacing, anchor length, direction and concrete spray thickness in accordance with the design standards, and records must be carefully made for future reference.

10. Changing the type and standard of temporary support must be approved by the project manager, design and supervision department. It is strictly prohibited to lower the support standards on your own at the construction site.

11. The ventilation system in the cave should be designed, comprehensive dust prevention measures should be taken, and the concentration of dust and harmful gases should be tested regularly.

12. A strict system for receiving and returning blasting equipment should be established, and storage outside the warehouse is strictly prohibited. On-site blasters should be specifically responsible for the approval of use and control of the quantity used and returned to the warehouse.

13. Publicity slogans and warning signs should be set up inside and outside the cave so that workers can see them everywhere to increase the safety awareness of the "three no harms".

14. Full-time security personnel must conduct a comprehensive inspection of the construction site every shift, paying special attention to strengthening the inspection of the surrounding rock and temporary support status, not letting go of any small changes, and keeping records. . If any problems are discovered, report them to the competent authorities in a timely manner for proper handling.

15. Tunnel construction should formulate emergency plans to prevent collapse, water intrusion, gas and other emergencies, equip with necessary rescue machinery and materials, clearly define the organization and division of labor, and take measures quickly to reduce losses when problems arise.

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