Due to the excessive pressure of the 50108 inlet passage, the top of the roadway is seriously deformed and cannot meet the requirements of ventilation and pedestrians. According to the arrangement of the Ministry of Mine Production Technology, our team will expand the side of the side of the bridge to the outer side of the roadway, and the whole section will be carried out. The bottom is ensured that the width of the roadway is not less than 4m, the height to the lower edge of the shed beam is not less than 2.6m, and the expansion of the front axle is not less than 5m. In order to ensure the safe and smooth construction, this safety technical measure is specially prepared.
Second, the construction plan, method
1. Before the construction, prepare the tool materials required for the construction. After checking and confirming the permanent support of the construction section, perform the knocking on the top to handle the live rock. It is found that the unloaded or damaged monomer should be re-suppressed twice in time. Inject or replace. Before the expansion, the cable should be hung neatly. During the construction process, the tool material should be damaged.
2. After the bottoming, the height of the roadway to the lower edge of the shed beam is not less than 2.6m (full-section bottoming). The hard rock layer of the bottom plate is excavated with a loose dynamic vibration gun. The depth of the eye is 1000mm, and the distance between the blastholes is 400-500mm. eyes than 5, selected YT-28 type drill pneumatic drill, "word" type alloy steel drill bit, drill diameter Φ43mm, a hollow hexagonal rod, the length of 1500mm.
3, the choice of coal mine detonator deferral milliseconds electric detonators, the choice of explosive mine two permissible emulsion explosive, selected FMB-100 detonation type blasting machine.
4, single hole charge does not exceed 2 rolls (400g), must adhere to the positive charge, series line, one charge, one line initiating.
5, before shooting, the first construction site 20m Feng Shui conduit, cables, electrical equipment and the like is covered with a waste belt protection, and banding with iron wire, the roadway lighting floor and covered protection waste belt protection belt joints phase mixed is not less than 200mm . The blasthole is covered with a waste belt and protected by a chute.
6. After blasting, first enter the working site to check the support of the top plate and the gang. For the tilting unit, timely correct the right and secondary injection to ensure one beam and three columns, and the bridge to the suspended part is made of slabs.
7. After the blast, the stone will be transported to the 50108 wind-driven belt head with a belt and then loaded out of the mine truck.
8, expand the use of the wind with the artichokes to spread the brush into place, artificially out of the coal (矸) on the belt (or bridge). When expanding, follow the roadway from the inside to the outside, the cycle progress is 800mm, the maximum empty top distance is no more than 200mm, and the maximum support top distance of temporary support is not more than 1000mm.
9. During the expansion process, the saw bolts should be sawed off in time to remove the exposed bolts, and the original support trays and nets should be removed. The length of each construction is 800mm, and the expansion of the construction can complete one cycle before the next cycle construction. . The hydraulic monomer is used as a temporary support during the construction process.
10, permanent support: after the expansion of the use of anchor cable + I-beam hydraulic single shed support, the anchor rod used ? 20 × 2200mm rebar anchor, rectangular arrangement, the top row spacing is 800 × 800mm. The top anchor tray uses a 150 x 150 x 8 mm iron tray, and the gang bolt tray uses a 300 mm long W tray plus an iron tray. The anchor cable is made of 17.8×7300mm steel strands, arranged one by one, with a row spacing of 1600mm. The anchor cable tray is made of Q235 steel plate with a specification of 300×300×12mm. The top mesh adopts the metal mesh made of GB10 wire. The mesh specification is 900×2600mm, the mesh is 50×50mm, the mesh must use 12# double-strand iron wire and the hole must be connected; the gang adopts double-resistance net, the specification is 900 × 3000mm (model JDPP30-30MS), the network is woven with cross-hole cross-connection and a knot every 300mm. The anchoring agent adopts MSZ23/35 resin coil, each anchor rod uses 2 knots, the anchoring force is not less than 85KN, the torque is not less than 160N.M; each anchor cable uses 5 knots, and the pre-tightening force is not less than 20MPa. The anchor rod is exposed to the outer thread of the anchor nut 10-40mm, and the anchor cable is exposed to expose the lock 150-250mm.
10. The bridge motor is extended to the outer section and the lag is extended to help the 5m erected steel shed to strengthen the support. The shed legs are hydraulic single-pillars. The specification model is DW31.5-250/100X, and the shed beam is 3.6m long I-beam. Lace beam, shed distance 500mm, each shed has a beam and three columns, the two heads are 150mm from the beam head, and the middle one is 100mm away from the belt frame. All the monomers must be hit on the solid bottom, and must be straight and straight, wear shoes and hang anti-back rope, the top of the I-beam steel shed beam must be tightly connected with the back of the plate, and the ends are tied with 12# double-strand wire. On the top mesh. The single-pillar support must be set as a line against the center line, the allowable deviation is not more than ±100mm, and the initial load of the unit is not less than 50KN.
Third, safety technical measures
1. Before construction, carefully check the top support situation at the work site, and promptly help the top of the top to handle the live coal gangue to ensure the safety of the top of the work site and prepare the materials and tools required for the operation.
2. Before the construction, the signal and the coal sweeper must be installed in place. The belt H frame is fastened with double strands of 8# wire. After the bottom, the H frame adjuster is replaced in time.
3. Persist in using temporary support and protective net during construction, and temporary support is supported by hydraulic unit.
4. Before the construction, the double-resistance net and the anchor tray of the original gang must be removed row by row, and each row of the construction should be supported in a row.
5. During the construction process, insist on short excavation and short support, and it is strictly forbidden to control the distance.
6. Observe the top plate at any time and find the problem in time. In the case of serious sinking of the roof, the shed will be strengthened in time.
7. When you are eye-catching, the personnel should stand in the correct position to prevent the rig from tripping over, breaking the braze and so on.
8, the eye-catching personnel are forbidden to bring gloves, the sleeves, the corners of the clothes should be fastened, the towels should be tight, so as not to be entangled in the wounds.
9. When pulling the anchor cable, no one is allowed under the jack to prevent the jack from falling and hurting people.
10. If the construction needs to cross the belt, the pedestrian must cross the bridge. It is strictly forbidden for personnel to climb over the bridge.
11. During the operation of the belt, it is strictly forbidden for the personnel to enter the inner side of the belt or to start the bottom under the belt. During the construction process, the personnel should maintain a certain safe distance from the belt to prevent the large coal gang from rolling down and injuring people.
12. When the belt is under the belt, the belt must be locked off.
13. During the operation of the belt, it is strictly forbidden for personnel to clean the rotating parts of the belt to float coal.
14. During the construction process, it is necessary to promptly send people to clean up the coal piled up by the coal sweeper. It is strictly forbidden for the personnel to directly use the iron shovel or hand to clean the coal gangue on the bottom belt of the coal sweeper.
15. Due to the narrow space of the roadway and the difficulty of construction, personnel should pay attention to the improper use of operating tools and materials during the construction process, pay attention to personal standing.
16, the slider head expansion personnel should pay attention to the nose of the coal gangs rolling down wounded, when the situation can be pressed the emergency stop button.
17. Any personnel shall not arbitrarily start the electrical equipment of other districts during the construction process. If necessary, they shall inform the on-site team leader, and the responsible area team shall arrange personnel to cooperate.
18. After each class is permanently supported, the inspector must use the torque wrench to check the pre-tightening force of the bolt one by one. It is found that the pre-tightening force is less than 160N·M and the broken anchor rod is immediately tightened or re-wrapped on duty. The pre-tightening force of the anchor cable must reach 20Mpa.
19, the construction process should pay attention to the protection of the cable, beware of improper damage to the tool materials or personnel.
20, when handling the unit, the beam, must cooperate with each other, lightly lift slowly, it is strictly prohibited to throw freely, to avoid rubbing your hands.
21. If the unloading, liquid leakage or failure of the monomer is found during the construction process, the liquid injection or replacement must be carried out in time. The principle of first support and back must be adhered to.
22, the interface between the monomer and the shed beam must be added with waste belt for anti-slip, column shoes, anti-back rope complete.
23, the wind pipe joints must be connected with a regular U-shaped card, it is strictly prohibited to use the wire instead. After each use of the hydraulic gun, the shut-off valve should be closed in time to relieve the pressure.
24, when the shed, the belt must be power-off lockout and listing, there is a special person command, the staff must cooperate with the beam to prevent the beam from hurting people.
25. During the shed process, no random personnel are allowed to pass through the shed area. Pipes and cables must be erected on the inside of the shed leg. During the construction process, cable and feng shui pipelines should be protected.
26. When it is found that the sound of the sound, the slag, the chip, the crack, the separation layer, the leaking roof, the sudden increase of gas emission, and the increase of the amount of water on the roof increase, the personnel must be evacuated immediately, and the risky operation is prohibited.
27. During the construction process, materials, tools, etc. must be placed neatly to keep the road open.
28, when pulling the end of the belt, no one is allowed in the ropeway.
29. When the coal machine passes the machine head, the personnel must be evacuated to the coal wall at least 5m outward to prevent the old anchor rods from being thrown during the coal cutting process.
30. Stones with a block diameter of more than 300mm are strictly prohibited from being directly attached to the belt. They must be crushed before they can be used on the belt. When smashing large pieces of meteorites, you must bring your eye protection cover to prevent Mars from splashing people.
31. Anchors, plates, nets and other sundries are strictly prohibited on the belt.
32. Do not drill with the drug at the same time.
33. The blasting operation shall be carried out by a full-time blaster, and the “one gun and three inspections†and “three-person chain shooting system†shall be strictly implemented. When the gas concentration reaches 0.8%, it is strictly forbidden to drill, shoot, and handle. The shooting must be set to alert and pull the warning line, the warning location: 50108 wind tunnel and cut-off distance 120m away from the blasting site. All personnel in the warning area are withdrawn, and personnel are strictly prohibited from entering the warning.
34. The blaster must separately store the explosives and electric detonators in a special explosive material box and lock them; it is strictly forbidden to throw or throw them. The explosive material box must be placed in the top plate intact and fully supported, avoiding the location where the machinery and electrical equipment are not wet. The explosive material box must be placed in a safe place outside the warning line during blasting.
35. The firing of the gunner must be carried out in the vicinity of the blasting work site where the roof is intact, the support is complete, and the electrical equipment and electrical conductors are avoided. It is strictly forbidden to sit on the explosive material box and assemble the explosive charge. The number of assembled explosive charges is limited to the amount required at the time. The remaining detonators and explosives must be returned to the explosives store for management.
36. The key of the detonator must be carried by the blaster and it is strictly forbidden to transfer it to others. Do not insert the handle or key into the detonator until the blast is energized. Immediately after blasting, the handle or key must be removed, the busbar removed and the kinks twisted into a short circuit.
37. The last of the gunners is away from the open gun site, and must be fired at a safe location with a cover 100 meters away from the shooting position. A clear shot signal must be issued before the shot (ie, three screams "fired").
38. Before the blasting, the connection work of the foot line is assisted by the blaster by the specially trained team leader. The blasting busbar is connected to the foot line, the inspection line and the power-on work are only allowed to be operated by one blaster. The number of the team leader before the shooting will be counted, and the order will be issued after the confirmation is correct.
39. The blasthole must use water cannon mud and loess to seal the mud.
40. After the guns are blown away, after the captains, the class (workers) and the security inspectors, carefully check from the outside to the inside, after confirming the safety, other personnel can enter the work place.
41. Water must be sprinkled before and after shooting.
42. This measure does not mention the contents. If it is involved, it is strictly in accordance with the relevant provisions of the “Safety Regulations for Coal Mines†and “Technical Operation Procedures for Coal Mine Workersâ€.
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