First-time topping and cycle to pressure safety technical measures
The +450m horizontal Xisi Shimen coal slope three-slot wall has now entered the initial ceiling period, to ensure the safety of personnel during the initial ceiling and period pressure, to prevent the damage caused by the initial collapse of the direct roof, and to ensure the safety of construction. Prepare this safety technical measure.
2 work surface overview
The east side of the working face is bounded by a wall opening and cutting; the west is bounded by a three-slot main Shangshan coal column line; the south is bounded by a wall on the north side; This work surface has now advanced 4.2m (as of the night of February 3rd).
3 Safety technical measures
3.1 roof board stepping distance prediction
3.1.1 Direct top initial stepping distance
L. =
≈ 37m
Where: MZ is the direct top thickness; M1 is the total thickness of the old top and the direct top; σ is the direct top tensile strength; γ is the rock bulk density;
3.1.2 Direct top cycle fall step:
L1 = (1/3) L.
=37/3
≈ 12.3m
3.1.3 Old top first step:
L2 =
=
=160m
3.1.4 Old top cycle to step:
L3=(1/3)L2
L3=160/3
≈ 53m
3.2 Working face top management
3.2.1 Point column: When the roof of the mining face is partially broken, the cap column is added in time between the broken part and the basic column to strengthen the roof support.
3.2.2 Use of signal column: When the working surface advances 15m along the strike direction, the direct top of the goaf still does not fall. Before the column is returned, the bamboo signal column must be laid. The direction of the signal column is: the distance along the trend is 10m, along the direction It is 5m.
3.3 Safety technical measures for the prevention of roof fall induced coal cannon
3.3.1 with electrical equipment, the switch bifilar lead wire 8 is fixed on the top, to help the anchor and firmly tied; other materials, tools and accessories into the box and the box must lead wire 8 is fixed by the number of double-stranded Control the anchor, and the binding is firm.
3.3.2 It is forbidden to accumulate debris in the roadway to ensure the smooth exit of the safety exit. All spare equipment and materials are cleaned up to the outside of the rocky alley or work site, and the well-ventilated lanes where people do not pass frequently are placed.
3.3.3 Each class must have a full-time listening to the top of the wall, and find abnormal conditions (such as the roof sinking, breaking, the single hydraulic valve, the three-use valve is generally venting, the top plate is frequently audible, etc.) It is necessary to quickly whistle to inform the on-site personnel to evacuate to the +570m level five-slot floorway or the +450m level of the West Sishimenjing coal slope. After the pressure is restored to stability, the staff and the squad leader will inspect the work surface to confirm the safety and recover. jobs.
3.4 Work surface support quality management
3.4.1 When the coal thickness is less than 2.4m, the bottom is seen at the bottom, and no bottom coal is left. When the coal thickness is greater than 2.4m, the bottom coal must be left, and the mining height is controlled at 2.4m. The single column must wear iron shoes.
3.4.2 The support should be stabilized and fastened. The column claws are stuck in the alveolar socket of the top beam. The pillars are strong against the mountain and it is strictly forbidden to hit the floating coal floating raft. The initial support force of the single pillar is not less than 90KN.
3.4.3 Pillars must be lined up and ensure that the support is effective.
3.4.4 After each shift, the squad leader sent a special person to replenish all the concrete pillars on the wall to ensure the working resistance of the single column.
3.5 Roof management during the initial collapse and periodic collapse
3.5.1 Top management of the initial collapse of the direct top
3.5.1.1 Strengthening support measures: When approaching the initial top stepping distance (30m working face), strengthen the support with column-column combined columns, with a pair of column spacing of 2.0m and a pair of column spacing of 5.0m. Not less than 5 per cluster.
3.5.2 Roof management of direct top cycle collapse
During the period of 3.5.2.1 cycle, the column is 2m pair, and a column is set at 8.0m intervals, and the column is not less than 3 pieces/æ’®.
3.6 Roof management during the initial pressure and cycle pressure of the old top
3.6.1 Close to the old top first step (the working surface is propelled 150m) and the cycle to the step, the column is combined with the column to strengthen the support, the column spacing is 2.0m, the column spacing is 5.0m. , no less than 5 per cluster.
3.7 Close to the direct top step and the old top step, the underground workers will participate in the top-level disaster avoidance exercise.
4 other
4.1 Participants who participate in this work surface must study this measure and can take up the post after passing the test.
4.2 In addition to the implementation of this measure, other unfinished matters, strict implementation of the "coal safety regulations", "coal safety production operation regulations" and company, mine related regulations.
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