RU2364828C1 - Formation method of compound blast - Google Patents

Abstract

FIELD: explosive works.

SUBSTANCE: invention relates to mining engineering and can be used for hole loading when carrying out explosive works in mining engineering and construction. Formation method of compound blast provides for forming blast from water-resistant blasting powder in water-cut hole part, placing foamed polystyrene on the mirror of water displaced upward the hole, forming blast from non-water-resistant blasting powder on it and installing stem. Float, made from material with flotation properties and able to stand weight of blast obtained from non-water-resistant blasting powder, is placed on the mirror of water displaced upward the hole. Pieces of rocks or drill cuttings in tissular or polyethylene envelope with diametre not bigger than hole diametre are put onto the float.

EFFECT: reducing cost of explosive works production due to replacing expensive water-resistant blasting powder with cheaper non-water-resistant blasting powder and simplifying water-cut hole loading.

1 ex, 1 dwg

Description

The invention relates to mining and can be used for loading wells during blasting in mining. The invention can also be used in the production of explosions in construction.

Known methods of loading flooded wells that use expensive waterproof explosives (BB) (V.L. Baron, V.Kh. Kantor "Technique and technology for blasting in the USA" M., Nedra, 1989, 376 p .; BN Kutuzov "Destruction of rocks by explosion. Explosive technologies in industry", Moscow, Publishing House of Moscow State Mining University, 1994, 446 pp.), Which increases the cost of preparing 1 m ^{3 of} blasted rock mass.

There is also known a method of forming a combined charge (V.L. Baron, V.Kh. Kantor "Technique and technology of blasting in the USA" M., Nedra, 1989, 376 pp .; B.N. Kutuzov "Destruction of rocks by explosion Explosive technologies in industry ”, Moscow, Publishing House of the Moscow State Mining University, 1994, 446 pp.), In which a granulated waterproof explosive (granulotol) is poured into the water, which is heavier than water, and after filling the well with it, it is non-waterproof BB But this explosive is 2.0-2.5 times more expensive than a waterproof emulsion explosive and is currently practically not used.

A known method of forming a charge and metal stemming for its implementation (RF application No. 2006108299, IPC E21C 37/00, F42D 1/00, publ. 09/27/2007), adopted as a prototype, including the formation of a charge from a waterproof explosive in the flooded part of the well, placement on a mirror of the expanded polystyrene water displaced up the well, the formation of a charge on it from a non-water-resistant explosive and the installation of a clog.

The disadvantages of this method: the difficulty of loading flooded wells, the high cost of blasting, low quality preparation of the blasted mass.

The objective of the invention is to reduce the cost of blasting by replacing an expensive waterproof BB with a cheaper non-waterproof BB, simplifying the loading of flooded wells.

These tasks are achieved by the fact that in the method of forming a combined charge, which includes forming a charge from a waterproof explosive in the flooded part of the well, placing expanded polystyrene on the water displaced upstream of the well, forming a charge from the non-waterproof explosive on it and installing a clogging device, according to the invention, to the displaced mirror a float is made up the water well, made of a material having floating properties, capable of supporting the weight of the charge from a non-water-resistant explosive, on which allowed pieces or rock cuttings placed in tissue or polyethylene sheath diameter is larger than the borehole diameter.

The inventive method is illustrated in the drawing, which shows a loading diagram of a waterlogged well.

The method is as follows. First, gun 1 is lowered to the bottom of the well, then water-resistant explosive 2 is poured into the minimum amount allowed for the blast passport. Then, a float 4 made of a material having floating properties is lowered onto a mirror of water 3 displaced upstream by a water-resistant explosive 2, then pieces of rock or drill cuttings placed in a fabric or polyethylene sheath 5, the diameter of which is larger, are lowered onto the float 4 diameter of the well, to close the gaps between the float 3 and the wall of the well, and then lower the next gun 1 and put in the well non-waterproof BB 6 in the amount necessary for a quality explosion according to the passport of the explosive. Carry out the stemming of the well.

An example of a specific implementation of the method.

The method was carried out at the Kedrovsky coal mine, a branch of the coal company Kuzbassrazrezugol, on a mining site No. 3, horizon +174, in case of a rock explosion with a strength of 9.5 on the scale of prof. Protodyakonova M.M. The block was drilled with a drilling rig ZSBSh-200N with a grid of 6 m by 6 m wells, a depth of 15 m and a diameter of 215.9 mm. Wells are drilled vertical. The inventive method was tested on 10 wells. First, the fighter PT P750 was lowered to the bottom of the well on a detonating cord, then an expensive waterproof BB - Sibirite 1200 - 470 kg was poured, then a float was lowered onto the surface of the water displaced by the waterproof BB (for example, an empty plastic 5-liter drinking water bottle) and pieces of rock or drill cuttings placed in a fabric sheath (for example, a polypropylene bag with a pin), the diameter of which is larger than the diameter of the well, were lowered onto the float, after which the next PT П500 fighter was lowered and It fell into the well nevodoustoychivoe BB beads UP-1 - in an amount of 400 kg, the required quality for explosion passport BB. Well clogging was carried out. Thus, 10 wells were charged. Before the explosion, the distance from the surface to the top of the charge in the borehole was measured. It has not changed during the charging of the entire unit. Despite the fact that part of the expensive explosive was replaced by a cheaper explosive, the quality of preparation of the blasted rock mass of ten control wells remained the same as in the remaining wells.

The inventive method allows to simplify the loading of flooded wells, reduce the cost of blasting, without compromising the quality of preparation of the blasted mass.

Claims (1)

A method of forming a combined charge, including the formation of a charge from a waterproof explosive in the flooded part of the well, placing expanded polystyrene on the water displaced upstream of the well, forming a charge from the non-waterproof explosive on it and installing a stemming device, characterized in that the water is displaced upstream of the well an object with floating properties, capable of supporting the weight of the charge from a non-water-resistant explosive, onto which pieces of rock or drill cuttings placed in tissues are lowered o or polyethylene sheath, the diameter of which is greater than the diameter of the well.

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