Safety technical measures for partial expansion of belt dark inclined shaft

The belts of the dark inclined shafts from 90 to 130 are severely deformed under pressure and the end face is reduced by less than 80% of the original design, which cannot meet the safety production needs. According to the mine arrangement, in order to ensure the safety of pedestrians and transportation, it is decided to expand the lot by the opening team. To ensure construction safety, the construction measures are specially prepared:

Second, the location and scope of expansion:

The deformation of the roadway from 90 to 130 parts of the belt inclined deep well requires serious expansion.

Third, the roadway section and support form:

1. The expansion adopts 4.25m 36U arch bracket support. After expansion, the net width is 4.20-4.30 meters, the net height is 3300mm, the pipe side is 1600mm wide, the column depth is 150mm, and the bracket shed is 0.6m. Must be planted to the real bottom, the beam mouth is tightly jointed and does not drink the wind. When the roof is broken, the temporary support method is the front wedge support method.

2, using the back shed 0.8mX8m metal diamond mesh, Wattle Tree back shed, back to the field. Each 0.2 m is connected with a buckle, and the mesh is connected to the net by 0.1 m. The double-sided lap joints are connected neatly and tightly by the continuous mesh, and arranged according to the “three flowers”.

3, each of the back wood is a group, each back of a group of 0.4 meters back; The shed and the shed are connected by metal connecting plates, and the screws are tightened and screwed.

4. After the shed, the tidal spray is closed. The spray thickness is 100mm. Ash: sand = 1:2.5, the quick-setting agent blending ratio is 2.5~4%, the water-cement ratio is 0.45, and the water wind pressure is adjusted beforehand to reduce the rebound.

5, spray spray should be sprayed to the real bottom, no honeycomb surface, wearing a skirt phenomenon.

6. The construction is strictly in accordance with the strict construction of the production line inspection department. Slope - 12.5 degrees.

Fourth, security technical measures:

1. Each class must be supervised by the team leader on the spot and responsible for the safety and engineering quality of the class.

2. Before each shift, after the shift, before and after the blasting, before the workers enter the construction site, the team leader and team leader should strictly check the brackets, belt racks, tops, gangs and exposed old anchors from the outside to the inside. Strictly implement the knock-on top system and the special person supervision system. The team leader personally arranged two experienced old workers to carry out the package. One person uses a long-handled tool to knock the top of the top to deal with the live sputum, and the other person monitors the top plate full-time and finds hidden dangers in a timely manner. Operators must operate in a safe location under permanent support and ensure that the retreat is unobstructed and that empty top operations are strictly prohibited.

3. When dismantling the abortion and blasting operations, the team leader and the team leader must arrange for the experienced old workers to look after the roof to prevent accidents and remove at most one at a time. Temporary support is to use the ∮18~22cm pit wood to hit the pole (lifting shed) or 36U shed in front of the steel pipe to support the back top gang. It is necessary to use the 18~22cm diameter pit wood before and after the construction blasting point to make a solid and reliable double lifting shed (100mm thick wooden board and old belt) or construction protection platform for effective protection. When the top plate is broken, the top gang must be controlled by the wedge method. When going to an abortion, no one is allowed within 20 meters below, otherwise it is strictly forbidden to carry out this work.

4, the shed is strictly in accordance with the waist line of the local survey department. The shed should meet the mountain, and the angle of the mountain should be no more than 2 degrees. It should not be flowed and swayed.

5, the empty top is not more than 0.4 meters, with semi-circular wood, old road wood and other back strict, real-time operation is strictly prohibited.

6. Adequate semi-circular wood, iron anchor, old water gun, pit wood, etc. should be prepared near 20 meters above the construction point, so that the hitting rod and the wedge support should be timely (when the top is controlled by the wedge method, it must be densely arranged to ensure Safe and effective).

7. Before expanding the area, it is necessary to clean up the debris in the road and the top of the roadway within 10 meters of the expansion point and the debris in the roadway.

8. When you are eye-catching, it is strictly forbidden for the person to work on the eye to prevent the person from being broken.

9. During the whole expansion work, the safe retreat under the construction site must be kept open, and there is a special person to supervise the roof and prevent the material from rolling down. Otherwise, construction is strictly prohibited.

10. The number of blastholes per gun should not exceed 3, the depth of the blasthole should not be less than 0.6m, and the charge per eye should not exceed 1 knot.

11. Before the construction, the team leader must assign a special person to bury the cable of the upper and lower 20 meters of the construction roadway into the bottom 20cm below the floor and cover the old belt and planks for proper protection. The board and the old belt are effectively shielded to prevent collapse or slag damage.

12. Before the shooting, the team leader and the team leader should assign a special person to inform the electromechanical three team belts to stop the operation in advance and get a special person return signal to confirm that the belt stops running.

13. Before the shooting, the team leader on duty should assign a special person to advance to all the passages that can reach the shooting point. The warning distance is 150 meters. And personally count and evacuate all the staff to avoid the safe places outside the cordon. During the shooting, the guards are strictly forbidden to enter any warning area.

14, the team leader must wear a portable tile detector, when the gas concentration is greater than 0.5%, it is strictly prohibited to shoot.

15. Adhere to the use of water cannon mud and a clean water curtain covering the entire section at 10 meters and 20 meters below the working point, and ensure that it can be sprayed normally.

16. After shooting, after the guns are blown away, the team leader and the squad leader must first inspect the blasting site to check the gas, brackets, belt racks, ventilation, dust, roof and residual blast, and find problems in a timely manner.

17. When personnel enter the work, they must first use the long-handle tool of 2.5 meters or more to make a detailed knock-out of the top from the top of the guard under the supervision of full-time top-view workers, and find that the active endangered stone must be disposed of. When knocking on the top, the person must stand in the upper part to help the safe position, and pre-clean up the safe retreat. No one should work or stay in the lower 10 meters.

18. Due to the large section of the roadway, when working on eye-catching and shed work, a firm working platform must be built with 100 mm thick pine boards in advance, and the belt should not be ≤600 mm from the upper belt.

19. The signal device must be installed near the construction site of 10m. The blasting operation must notify the electromechanical three teams to stop the belt operation and be in the no-load state. Otherwise, the blasting operation is strictly prohibited.

20. Performing shotcreting operations According to the conditions of the construction site, use colored strips and old belts to protect pipelines and facilities. To protect equipment and facilities from dust and dust, you must cover the equipment, facilities and pipelines with color strips in advance.

21, the nozzle and the surface to be sprayed should be as perpendicular as possible, and the distance from the surface to be sprayed should be controlled at 50-100cm. When spraying, the nozzle should be rounded around the surface to be sprayed. The sprayer should be adjusted according to different injection locations and angles. The position and pre-adjust the water pressure and then feed, to reduce the rebound. If you need to spray the second layer, the interval between the two layers should be 15~20min, the spray sequence should be high to low, first top back .

22. Before each shift, check whether the hose of the pneumatic tool and the metal pipe of the air supply are firmly connected. Before the work, the pipe should be ventilated and blown at any time. people.

23. The air supply pipe shall not become an acute angle, and shall not be twisted or deformed; the hose for transportation shall be firmly twisted and knotted by double-stranded network.

24. When replacing tool attachments or exchange tools in use, the air duct valve should be closed beforehand, and the remaining air in the tube should be drained before replacement.

25. The pneumatic conveying hose is not allowed to clean dust and debris from the personnel.

26. Before the expansion, the third team of the electromechanical team installed the bottom belt cleaner at about 15m below the construction point. During the construction period, the three teams were responsible for daily maintenance.

27. Construction must be tightly tightened on the cuffs of the pants, concentrate on the situation, and look forward to the future, do autonomous security and mutual security.

28. After the end of each shift, the environmental sanitation of the upper and lower 10 meters of the working section must be cleaned up and the materials should be neatly arranged.

29. This measure is copied to the third team of electromechanical.

30. This measure must be implemented in detail to all construction personnel and perform the signing procedures.

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