Lane opening driving safety measures

The second 1-11090 machine lane return airway is located 60 meters in front of the opening of the No. 1-11090 machineway, and the main service is the return air during the tunneling of the 1-11090 machine. The blasting method is used for excavation, and this measure is specially formulated to ensure the smooth and orderly construction of the roadway.

I. Overview of the excavation of 91031 lane

Lane 91031 9103 for the transport trough face, designed to dig tunnel 330 meters long, using mechanized digging excavation machine, both along the coal seam 9 # Driving half Roof coal roadway. The opening position of the roadway is located in the transportation lane of the panel, and is driven along the roof of the coal seam at a direction of 19°. 25 meters in front of the opening of the tunnel is a digging machine installed in the digging machine.

Second, roadway specifications and support requirements

The front face of the 91031 lane is a gradient end face, which is supported by the stone wall frame of the stone wall. The excavation and support specifications of this area are shown in the opening support diagram; the 5.6 to 15 m is supported by the I-beam, the beam length 3.3 meters, leg length 2.5 meters, the section of the roadway is 3.3 meters wide, the lower mouth is 3.7 meters wide, the height is 2.6 meters, the upper mouth is 3.0 meters wide, the lower mouth is 3.4 meters wide, and the net height is 2.4 meters. The 15-25m section adopts a 3.3-meter-long beam and a 2.3-meter-long leg. The section of the roadway is 3.3m wide, the lower mouth is 3.7m wide, and the height is 2.4m. The upper mouth is 3.0m wide. The net width is 3.4 meters and the net height is 2.2 meters.

Third, the construction process and requirements

1. Construction method: Roadway excavation uses coal electric drill (wind drill) to drill, blasting coal, artificial coal (rock), coal slip transport to the coal roadway.

2. Construction process: handover → preparation → drilling → charging → blasting → hanging net → temporary support → shipping coal → permanent support → pick-up

3. Construction organization: The roadway tunneling adopts the “three-eight system” operation mode, with 3 shifts per day, 2 shifts per shift, and a circulation progress of 0.8 meters.

4. Construction process requirements:

Blasting: the working face is made of MZ--1.2 hand-held electric drill (wind drill), the second-level coal mine allows emulsified (powdered) explosive, the 1--5 section of coal mine allows millisecond electric detonator, MFB--100 type detonator Detonation, the connection method is series.

Linked network maintenance: Blasting has been completed, the team leader and safety officer to face strict "knock asked to help top", refuse handling live off the top of activated carbon to help, then hung a layer of metal mesh # 12 in Roof metal mesh # 14 using a lead wire for coupling, the coupling length of 0.1 m.

Temporary support: the roadway excavation adopts the temporary support of wooden hooded poles, and the column spacing is 0.8 meters. During normal excavation, two rows of columns are arranged in each row (one at each 0.8 m on both sides of the center of the roadway); when the opening is progressively sectioned, the spacing between the columns is 0.8 m. Pallet specification: 0.8m × 0.2m × 0.05m. The depth of the point column is not less than 0.1 m and the support is firm.

Permanent support erection steps and requirements:

(1) The shed must be properly organized and closely coordinated under the command of the team leader. The support workers must operate and operate according to their operating procedures and operating standards.

(2) Before the pillars are dug, the team leader will organize the experienced old workers to use the special tools to knock on the working face and find out the live charcoal. (Before you ask the top, you must clean up the safe retreat). After confirming the safety, confirm the safety. In order to dig the nest, a special person must observe the roof when digging the column.

(3) The bracket shed legs must be supported on the solid bottom, and the depth of the column nest is not less than 0.1 m.

(4) After the shed legs are erected, a special person is responsible for supporting the legs, and then manually lifting the upper beam of the steel beam and the upper rod.

(5) Adjust the position of the shed beam according to the middle line. After the acceptance is passed, immediately fix the beam with wooden wedges, then back and back.

5. Construction methods and requirements for wall support

After 15 meters of roadway excavation, return to the opening wall to build a wall guard. The length of the wall is 4.8 meters before the opening of the roadway. Pay attention to:

(1) Hang the vertical and horizontal lines according to the middle and waist lines of the roadway. During the wall-laying process, the stone is not allowed to collide with the line.

(2) Before the wall is built, first place a wooden column on the underside of each I-beam, and the position of the point column is located at 0.8 meters on both sides of the roadway;

(3) When laying the wall, the stone must be placed flat and flat. When the time is not normal, the gravel pad should be applied flat and stable. In the inclined roadway, the large surface of the stone should be consistent with the slope of the roadway. During the process of wall-laying, the wall should be filled with the wall.

(4) The length of a wall is 4 meters, and the height of a wall must not exceed 1.2 meters. The excess should be built after the initial setting of the mortar.

(5) The mortar mix ratio for the wall is cement: sand = 1:3.5 (volume ratio). When laying bricks, the mortar is even and full, without dry quilting, and it is strictly forbidden to dry.

(6) The pressure of the stone is obvious. Under normal circumstances, the width of the pressure is not less than 1/3 of the width of the stone. The pressure must be tight, and it is strictly forbidden to appear seams, heavy seams and uniformity. The interface must be kept long and short to ensure the next interface is tight.

(7) At the junction of the new wall and the old wall, the coal shovel and other debris must be cleaned and rinsed with water.

(8) The masonry wall of this lane is a single layer of stone (the thickness of the stone wall is 0.3 m), the foundation depth of the stone wall is 0.3 m, and the foundation is double-layered stone (thickness 0.6 m). The foundation must be dug to the real bottom.

(9) When the steel beam is placed on the stone wall, the length of the steel beam at both ends is 0.3 m.

Fourth, the production system

1, ventilation system

91031 lane excavation adopts the partial fan press-in ventilation, and the fan is installed in the inlet airflow in the panel transportation lane which is not less than 10 meters away from the opening. Ventilation route: bureau fan → air duct → working surface → panel return wind lane.

2. Coal transportation (矸) route: working surface → working surface coal slip → panel transportation lane coal slip → coal storage.

3. Transportation route: ground → monorail lane → transportation lane → transportation lane in Wu mining area → material oblique inclined well → return wind lane in the panel → 2# contact lane → panel transportation lane → working surface.

V. Safety technical measures

1. Before the opening construction, the surveying personnel of the geodetic surveying department shall calibrate the opening position of the roadway and the waistline in the roadway according to the design, and the construction team shall strictly follow the line for construction.

2. Before the opening construction, the feng shui pipelines on both sides of the opening shall be protected by a wooden raft with a length of 2.4m. The protective length shall not be less than 15m. The cable shall be covered with the old belt and covered with an old belt on the wrapped cable. The protective length shall not be less than 40m.

3. Before the opening construction, the construction team will lead the Feng Shui pipeline to the construction site to ensure normal construction.

4. The monitoring center is responsible for installing the monitoring facilities in place during the opening construction. After 5 meters of opening construction, the ventilation department will promptly introduce fresh air flow (air duct) to the excavation site to ensure normal ventilation.

5, 5 meters in front of the opening of the roadway using small artillery excavation (ie: the amount of charge in the gutter is not allowed to exceed 1 roll / eye, other eyes are not allowed to exceed 0.5 roll / eye), and wipe the angle (smear opening left left, mouth The width of the touch angle is 2.3 meters, and the section of the opening of the roadway is shown in the enlarged view of the opening.

6. When blasting, the opening 5 meters is divided into several parts by blasting operation, first blasting the grooving eye, then blasting the auxiliary eye, and finally blasting the surrounding eye and bottom eye, the amount of charge in the sulcus is not more than 4 knots, auxiliary The amount of eye-loading does not exceed 2 knots, the peripheral eye does not exceed 2 knots, the bottom eye charge is 3 knots, and the eye ditch charge is 3 knots.

7. Before the shooting, the personnel in the working face were evacuated to the intersection of -50 East Main Lane and one Lane. And the team leader is responsible for sending special personnel at the intersection of A, 50 Dongda Alley and Yilian Lane: B, 11 and the rear end of the roadway up 25m: C, 50 Dongda Lane and Erlian Lane intersection Be alert to prevent personnel from entering the gun area.

8. When blasting, it is necessary to strictly implement the "one shot three inspections" and "three-person chain" shooting system, and the team leader counts the number of people to confirm the safety and correct the order.

9. During the construction, the construction team must clean the floating raft and the ditches of the ditch to ensure the smooth flow of the transportation lines and the ditch.

10. During the construction of the roadway, the inspectors of the tile must check the gas situation at the blasting site before and after the shooting. When the gas concentration exceeds 0.5%, the blasting is strictly prohibited.

11. During the construction process, each team leader and team leader must carry a sensitive and reliable portable instrument. One is carried by the captain of the shift team, and the other is suspended by the team leader in the head. The suspension height is no more than 0.3m from the top plate. The air duct is not less than 0.2m, and the gas is monitored at any time.

12. During the construction process, each team leader must do a good job of knocking and helping the top, timely handling the two sets of umbrella rock and live rafts in the roadway, and strengthen the roof management to prevent the rock from falling and hurting people.

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