(1) Explosive varieties
You must use coal mine methane in the mine permissible explosives and detonators mine allowable electricity, nor the low-gas coal mine explosives for high gas mine.
(2) Detonator requirements
In the case of a gas fired or a working surface not far from the gas working face, it is necessary to use a coal mine permitted instantaneous power detonator or a coal mine permitted millisecond delay electric detonator. The mine allows the millisecond detonator to be used without jumping. The interval between two adjacent segments is ≤ 50ms, and the total delay time of the last detonator is ≤ 130ms. Electric detonators produced by different manufacturers or of different varieties shall not be blended. Do not use a detonating tube or a common detonating cord. Do not use a detonator.
(3) Charge
1. Charge structure
Forward detonation can be performed when the mining face of the high gas mine and the high gas area of ​​the low gas mine uses millisecond blasting. Because the detonating charge of the positive detonation is located at the outer end of the column charge, close to the blasthole, the bottom of the detonator is toward the bottom of the blasthole, so the scattered explosive particles and detonation waves are directed inside the blasthole, and it is not easy to detonate the gas. If reverse detonation is used, safety technical measures must be established.
For the peripheral eye, it is advisable to use a non-coupling charge structure or an air column charge structure.
2, charging construction requirements
The inspection must be done before charging, including checking whether the position and depth of the blasthole meet the requirements of the blasting design. Remove debris and water from the blasthole.
When charging, it is necessary to load the electric detonators of different sections in strict accordance with the design regulations, and fill the blastholes according to the designed loading amount.
When charging, use a gun stick to gently press the explosive. Can not use guns to collide or tamper with the medicine roll, otherwise the density of the explosive will increase and the explosion will occur, and it will easily break the outer skin of the medicine roll, break the outer line of the detonator and scrape off the insulation of the foot line, so that the explosive is damp, The detonator is broken or short-circuited, and even the detonator is slammed, and an accidental explosion occurs.
3, sealing mud and filling requirements
The blasthole sealant is applied with water cannon mud, and the remaining blastholes outside the water cannon are partially sealed with clay mud or with a non-combustible, malleable loose material. It is strictly forbidden to use pulverized coal, block materials or other flammable materials for blasthole sealing.
Blasting without blasting mud, insufficient mud or false blast is strictly prohibited; bare blasting is strictly prohibited.
It is not allowed to install only water cannon mud without clay mud.
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