Safety technical measures for face bolting under s

Safety technical measures for making cover bolts under the stoping conditions of fully mechanized top coal caving face

I. Description: 10301 fully mechanized top coal caving face is close to stoping mining. In order to ensure the construction safety under the stoping conditions of the working face, the safety technical measures are specially prepared as follows

II. Removal route of main equipment in the working face and location of coal machine nest and winch nest:

1. The conveyor head and motor reducer in front and rear of the work, some chutes, cable troughs, all scraper chains, transfer machines, crushers, transportation trough support, and head end support are removed from the upper trough

2. Remove the hydraulic support in the working face from the lower trough

3. The tail of the front and rear conveyors, the motor reduction gearbox, some chutes, cable trays, and the mobile substation of the shearer, the track support, and the lower track are all removed from the lower track

4. The coal miner's nest is opened at the lower end of the working face, the winch nest is opened at the upper exit of the working face, the upper exit and the lower exit, and the middle of the working face. The winch sockets in the middle of the working face are selected at 99 #, 100 #, 49 #, 50 # (if the roof here is not suitable to be broken, two groups of supports with complete roof can be selected at the top and bottom according to the site conditions), which are aligned with the normal supports

III. preparatory work:

1. Before stopping mining and paving, the support must be pulled and moved to ensure that the support of the working face and the conveyor are straight

2. The mining height of the working face shall be strictly controlled at 3.2 0.2m, and the top and bottom plates shall be cut flat

3. Ensure that the air and water at the working face and the upper and lower ends are unblocked, and lay the air and water pipeline, corresponding tee and air bag at the working face. Prepare for bolting

4. The working face shall be formed into a natural slope to ensure smooth drainage

5. During stoping mining, the upper and lower trough shall adhere to the use of small end supports, and the roof shall not be repeatedly supported and damaged during lifting to ensure the integrity of the roof

6. Strengthen the support at the site where the roof is broken and where the roof is sinking, support the pillars and maintain the roof

7. Material preparation: 12 steel wire ropes (230m/piece, rope diameter ≥ 6 points), a total of 2760m, 150 large plates (specification: 3M 0.2m 0.05m), 60 single pillars, 870 pieces of metal (specification: 10M 1.3m), 3 tons of connecting wire, 86 2.9m mining I-beams, 10 3.2m I-beams, and 13 4.0m I-beams

IV. stoping construction method:

1. The working face is leveled to ensure that the working face is straight. Before stoping mining, the hydraulic lock of the support column is handled intensively to ensure that the support effectively supports the roof

2. When the production line is stopped for 15m, the single-layer metal shall be fully connected; After the single rooting is 14m away from the stoping line, the double connection shall be started (the specific construction method is as follows: every two groups of supports are separated, one group of support front beam shall be lowered, and the piece bound with the security plate shall be eaten into the top beam in a clockwise direction of not less than 1000mm to ensure that the piece is rooted, and then the large plate shall be bound on the metal, which shall be connected with the rooted piece to ensure that it will not fall, wear and tear when pulling the frame; after the single-layer metal takes root on the front beam, the double-layer metal connection shall be started). The double is required to overlap in fish scale shape. The lap joint along the working face tendency is not less than 200 mm, and the lap joint is 600 mm. The lap edges are connected by buckles. Each buckle is screwed 2 ~ 3 times, and it is necessary to flatten, and the buckle is tightened. The double connection ends at the coal wall, the side connection ends at the coal wall, the side connection ends at the roof crushing area, and the side connection ends at the bottom plate. Combined with the roof condition of the working face on site and the progress of coal mining, the working face should be gradually reduced until the coal caving is stopped

3. When it is 12m away from the stoping line, start to hang the steel wire rope. The first steel wire rope is laid under both sides 1m below the front detection beam, 300mm is buckled on both sides, and the rope distance is 900mm and 100 mm. A total of 10 ropes are laid. The first five ropes are 800mm apart, and the last five ropes are 1000mm long. A total of 10 ropes are laid (because the distance from the coal wall to the front detection beam after stoping mining reaches 2400mm, in order to ensure the integrity of anchor support, 1~2 ropes and other measures are taken according to the site conditions to ensure the conditions for stoping mining). The two ends of each steel wire rope are connected to the top of the roadway at the two lanes, and the rope ends in the face are overlapped and stubble pressed for more than 1000mm, which are connected by buckles. The joints of the two rows of steel wire ropes cannot be in the same support, and the steel wire ropes must be straightened and connected as a whole

4. When the first steel wire rope reaches the middle of the support tail beam, the last steel wire rope reaches the front beam, and the tail pressure of the plug plate reaches more than 1000mm, stop pulling the frame (until the mining is stopped, the support will not move)

5. The coal machine cuts coal upward from the lower 148 # frame. After cutting, the distance from the front detection beam to the coal wall is 1700mm (the cutting depth of the coal machine is 1000mm, and the end face distance is 700mm). Extend the plug plate to protect the top, hit the protective plate to protect the top, and remove the support connector. Use a single hydraulic prop (a sub beam) to push the chute out of 700mm. After the coal machine reaches the upper head and cuts through, eat the knife normally, cut the triangle coal, and go down to the tail of the machine to draw the machine to 7 # frame, At this time, the distance between the coal wall of 1 ~ 7 # frame and the front detection beam reaches 2400mm, the front machine head is pushed out 600mm, and the end mouth of the coal machine is wiped up to 3000mm, which is convenient for removing the equipment. The coal machine then continues to go down, ensuring that the distance between the coal wall and the front detection beam reaches 2400mm. After the tail of the machine is cut, the coal machine is pumped above the 137 # frame, and the 137 # ~ 148 # chute is pushed to the coal wall in a natural bending section. Then the coal machine goes down and wipes out the mouth, which is 3400mm to the front detection beam of the support. So far, the coal machine nest is opened

6. Finally, empty the coal machine to more than 128 # racks, bring back the part pushed out by the tail section chute, and straighten it with all supports in the working face, and then pull the coal machine to the tail machine nest, cut off power and lock it

7. When the working face is 10m away from the stoping position, lay 2.9m I-steel under the front beam metal of the upper 1-3 # frame and the lower 146 # - 148 # frame. Lay a row every 1m, with two staggered rows. Arrange the I-steel and steel wire rope as far as possible, and the rows are parallel to the working face

8. Clean the front, between, behind and at both ends of the rack, and level with the chute and support base plate. There is no floating coal and gangue. Power off and lock after the three machines are empty

9. After connecting the coal wall, bolt the coal wall for maintenance. The top row is required to be 500mm away from the shoulder socket, and then bolt another row every 1.1m below. Ensure that there are 3 rows of anchor bolts on the coal wall

v. support method of working face:

(I) construction method of bolting the coal side and roof after stoping Mining:

after stopping the frame removal, the relevant units will use the method of bolting the coal side and roof to maintain the roof in the frame section with intact roof at that time. The bolt spacing is 750mm and 100mm. See the attached schematic diagram for the row spacing

(II) construction method of supporting and sticking pillars after stoping Mining:

after stopping the frame removal, when the roof cannot be maintained by injecting anchor bolts in the roof broken frame section, the probe plate (I-steel) must be used to maintain the roof in the way of cooperating with the single pillar. The specific methods are as follows:

1. When the front probe beam reaches 1700mm of the coal wall, the protective plate must be extended to protect the roof, and the temporary large plate can be used to protect the roof at the place where the roof is broken, The top plate must be maintained in rows with I-steel

2. When the front probe beam reaches 2400mm of the coal wall, the probe plate must be immediately lifted for effective support. Each section of the coal machine is cut and stopped for support (1~5 groups of supports per section can be determined according to the situation of the top plate). At the broken part of the top plate, one must be cut and one must be maintained, and the probe plate must be replaced by I-steel. The specific method is: on each support (double down), pick two pieces of probe plate (I-steel), middle-middle 750mm 100mm, and then close to the side of the coal wall and under the probe plate (I-steel), set up a hydraulic monomer prop sticking to the upper. At present, the minimum model of this kind of experimental machine is 50kN, and the hydraulic monomer prop must be supported on the solid bottom

VI. construction and support methods of coal machine nest, end mouth and winch nest:

1. At the coal machine nest, on the basis of the original anchor support, a 3.2m iron shed is lifted on each support, with a middle to middle 1.5m and 0.1M. The inclined plate is added on the lifting shed, and the machine nest wall is well connected. A single column is set under the head of the front end of the shed

2. End mouth maintenance method: the inner roof of the working face shall be well overlapped with the roadway top, and a pair of door sheds shall be lifted at the lower exit with a 4.0m shed, which must be well supported and firmly supported on the lower exit roof (). Install anchor bolts at the upper outlet

3. Two winch sockets are respectively opened at the center line of the conveyor in the front and rear of the upper and lower upper sides of the upper outlet. The specification of the winch socket at the lower outlet is 2.5m deep, 2.3m high and 2.5m wide; Specification of upper winch socket at upper outlet: 2.5m deep, 2.3m high, 2.5m wide, rectangular section

support method:

(1) the material is supported by single columns in the direction of the direction, the distance between the shed and the middle is 0.8m, one beam and two columns, the top and side are paved, the back and top of the security board, and the shed and shed are firmly fixed. The thermal stability and heat resistance are very high

(2) the paving is adopted, and the reinforcement ladder is used to cooperate with the bolt support, and the row spacing between the bolts is 1.0m

VII. Roof management:

1. When it is 10m away from the stope line, start to pick the inclined shed along the trough (the upper shed is 4.0m long and the lower shed is 2.9m long) with a spacing of 1.0m to ensure effective support of the roadway in block B

VIII. After the expanded winch nest is removed, sandbags shall be used to make sandbags

IX. blasting construction method:

use air drill to drill holes, mine millisecond delay detonator to detonate, and mine emulsion explosive to blast. See the blast hole layout and blasting instructions for details

X. safety technical measures:

I. General Provisions:

1. Before construction, this measure must be communicated to all construction personnel and learned to sign, otherwise it is not allowed to go down to the well to engage in this work. Strictly implement the pre shift and post shift meeting system and the six no go down system

2. Strictly implement the system of knocking on the side and asking for the top, and timely arrange experienced team leaders and old workers to use long handled tools to find out the dangerous rocks on the roof and coal wall, so as to eliminate potential safety hazards

3. Equip and use qualified protective articles according to work needs to ensure construction safety

4. Where the coal body is relatively loose and the coal body is seriously chipped in the working face, before working close to the top and side of the working face, you must first be able to complete the control function with a delicate body and abandon the connection of PC, and then carry out the construction after protecting the coal side with a large plate and a hydraulic monomer prop

5. No empty roof. They bought a whole 3-story office building in CIMC smart Valley for empty roof operation, adhered to the "first pay then return" system, and no blind work and risky operation are allowed; Ensure working space and smooth evacuation route during work

6. Strengthen the equipment maintenance quality of the working face, ensure that the support is in good condition, all kinds of jacks are used normally, and ensure that the support system is free of leakage, liquid channeling and self lowering. When working in the rear, first cut off and lock the rear conveyor, and assign a special person to open the conveyor, then confirm that the support is in good condition, ensure the working space and clean it up, and clean up the obstructed materials to ensure that the retreat route is smooth

7. Check whether there is gangue leakage between the racks. If there is a problem, it must be dealt with first, and then enter the work after maintenance

8. The person in charge of safety must be defined at each work site, and the individual shall be responsible for the division of labor. Work must be done according to your ability. It is strictly forbidden to work overload or engage in work incompatible with your physical ability

9. When the working face is injecting anchor bolts and cleaning floating coal, the conveyor and shearer must be powered off and locked, and the locking shall be supervised by a specially assigned person to prevent the conveyor and shearer from suddenly starting. If it is necessary to start the conveyor and shearer, it must be confirmed that all personnel are removed to a safe place before starting the conveyor and shearer; After the conveyor and shearer stop running and confirm that the power has been cut off and locked, the construction personnel can enter the construction site for construction only after confirming that the conveyor and shearer are no longer started

10. The portable dual-purpose instrument must be hung at the upper winch nest. If the gas is found to be excessively high, ventilation, dust spraying and other measures must be taken in time. The construction can be carried out after the gas concentration is normal. If the harmful gas continues to be excessively high, it must be reported to the person on duty in time