Do I need to make explosion proof water bags when drilling roadway for coal mine excavation downhill

The auxiliary explosion-proof water shed is installed in the roadway of the two grooves of the excavation face and the mining face.

If it is a coal roadway, then explosion-proof water bags must be installed.

If it is a rock roadway, it can be left uninstalled.

Or the roadway you said is no longer excavated, but the last process is sprayed downhill, then there is no need to install it.

Major explosion-proof water shelters must be installed at the following locations.

1. The main transportation alley and return air alley that communicate with the shaft on both wings of the mine.

2. Centralized transportation roadway and return air roadway between adjacent mining areas.

3. The transportation stone gate and the return air stone gate between adjacent coal seams.

Auxiliary explosion-proof water shelters must be installed at the following locations.

1. The inlet and return air roadway of the coal mining face.

2. Coal seam excavation roadway in the mining area.

3. Adopt independent ventilation and other roadways with coal dust danger.

The amount of water in the water shed:

The water consumption of the water shed is calculated according to the roadway section, and the main water shed is not less than 400L m2, and the auxiliary water shed is not less than 200L m2.

The row spacing of the water shed is not less than 30 meters for the main water shed, not less than 20 meters for the auxiliary water shed, and not less than 120 meters for the decentralized arrangement.

The gap between the water shed and the roof beam and the two gangs is not less than 100 mm. The water shed is not less than a meter from the roadway rail surface. The water shed should be kept at the same height, and when it is necessary to pick the roof, the roadway section of the water shed area should be consistent with the 20-meter-long roadway section before and after.

The hook for hanging the water shed should be hung with a 45° oblique hook.

The water shed shall be set up in the straight section of the roadway, and the distance between it and the intersection and turn of the roadway shall not be less than 50 meters.

Water bags of the same size must be used for each shed, and no mixing is allowed.

When the operation of hanging water shed is carried out in the roadway with support, the original support shall not be destroyed. If it is really necessary to change, special measures should be formulated and construction should be carried out according to the measures.

The water source at the outlet point is intercepted, and temporary drainage holes are excavated to concentrate on drainage.

First determine the water inflow** and the nature of the water inflow, and then determine the water treatment plan according to the nature of the water source Generally, the grouting is water blocking, which is better, and it is estimated that the grouting time will be a little long, and there will be a certain investment, but the effect is good.

Explosion-proof water sheds should be installed in the inlet inclined shaft, stone gate, mining face inlet and return air lane, excavation roadway, and total return air roadway.

The water bag is mainly made of plastic products, and the water bag must be able to withstand long-term immersion in water, the material does not rot and the mechanical strength does not decrease, and has flame retardant and anti-electric properties. The shape of the water bag is a garden arc, and its placement mode is mainly hanging and horizontally arranged. The vertical distance between the edge of the water bag and the roadway wall, pillar and roof (beam) is not less than 100mm, and the distance between the water bag and the roof (beam) is not greater.

Water bag structure: The water bag must comply with the provisions of MT157-87 "Technical Conditions for Ventilation of Explosion-proof Water Tanks and Explosion-proof Water Bags for Coal Mines", and be inspected and qualified by the national quality inspection department.

The water bag shed consists of a water bag and a water bag mounting frame. The water bag mounting frame consists of two load-bearing beams that are parallel to each other, and the two load-bearing beams should be made of rigid materials and avoid downward bending and deformation after hanging the water bag. The net spacing between the two load-bearing beams should be 40mm larger than the width of the water bag, and the water bag hook is fixed on the load-bearing beam on both sides of the root in the opposite direction, and the hook cannot produce a free swing along the direction of the force by the action of horizontal force.

The distance between two adjacent hooks on the same beam is equal to the hole center distance of the two lifting rings on the same side of the water bag.

Explosion-proof water bags need to be installed at the inlet (return) air inlet (return) of the excavation face and the coal mining face and the Shimen roadway, and according to the calculation of the roadway section area, each square section is not less than 200 liters of water.

1. Of course, it is necessary to consider that if there are many equipment, the total load can be calculated according to the simultaneous coefficient and the demand factor, and if the equipment that is not used at the same time can be clearly distinguished, the total load can be calculated according to the maximum load (excluding the different simultaneous use, the total load can be calculated by considering the simultaneous coefficient and the demand factor).

2. In addition to equipment selection, the complete power supply design also includes cable selection, switch selection, protection setting calculation, power consumption estimation, etc. It depends on your requirements and how far you go.

It should be considered, otherwise the overload power supply will overheat and cause disaster.

What I know is that the underground tunnels are all illuminated, and each working face has its own power supply facilities

You check it in the coal mine survey regulations, I don't know, if there are results, share them.

He has provisions, mainly a matter of 3 points of distance

The spacing between the two bag groups is 10-30m

The distance between the water shed and the roof beam, and the gap (longitudinal projection) between the two sides (columns) shall not be less than 100mm

The height of the water shed from each track is not less than meters, the hook angle is 60-65 degrees, and the hook length is 25mm

Article 285 of the Coal Mine Safety Regulations stipulates that mines must do a good job of water hazard analysis and forecasting, and adhere to the principle of exploring and discharging water before digging when in doubt. Before excavating or approaching a waterlogged area or discharging water from a flooded roadway, a water exploration and discharge design must be prepared, and safety measures such as preventing gas and other harmful gas hazards must be taken.

The layout and advance distance of the water seepage are specified according to the height of the water head, the thickness and hardness of the coal (rock) seam and the safety measures.

Definitely, what else would the water do!