CN102620615A - Coal face blasting charge method - Google Patents

Abstract

The invention discloses a coal face blasting charge method, which is performed in sequence according to the following operation steps of: a, drilling in a coal wall along a coal face and then sealing the holes and injecting water for fracturing; b, forming blast holes on the coal face according to design, wherein the blast holes are arranged in a cinquefoil shape; c, filling a blister strip, a cartridge, a detonator and a blister strip into the blast holes in sequence; d, leading blasting wires out and sealing the remaining blast holes with stemming; and e, mutually connecting the blasting wires and connecting a bus to a blaster. After blasting, the blocky carbon rate can reach about 45 percent, rib spalling points of the coal wall are reduced, a support is difficult to collapse, and safe production is guaranteed.

Description

A kind of coal-face blast charging method

Technical field

The invention belongs to blast mining face in coal mine perforating blast charging technical field.

Background technology

The coal-face mining way generally is divided into machine instruction statement mining and blows out two kinds of blasting excavations under the coal mine, and blast mining face adopts the coal blasting mode always.Detailed process is: according to designing at the coal-face blast hole drilling; In borehole, insert powder stick, detonator, stemming successively, draw blasting wire; Seal borehole with stemming; Interconnect blasting wire; Bus is connected on the blaster.Borehole is arranged as five presbyopia, and ordinary circumstance onepull length is 3 meters, such blast charging technology, and actual production Central Plains coal block coal rate is not high, remains on about 28%, influences the selling price of raw coal; On the other hand, wall caving often takes place and causes potential safety hazard in working face.

Summary of the invention

The purpose of this invention is to provide a kind of coal-face blast charging method that the raw coal block coal rate is higher, wall caving is less of producing.

To achieve these goals, the present invention is undertaken by following operating procedure successively:

A. hole in the rib interior construction along coal-face, pressure break is carried out in the sealing of hole water filling then;

B. according to designing at the coal-face blast hole drilling, borehole is arranged as five presbyopia;

C. in borehole, insert blister band, powder stick, detonator, blister band successively;

D. draw blasting wire and remain borehole with the stemming sealing;

E. interconnect blasting wire and bus is connected on the blaster.

The present invention compares with blast charging method in the past, and following advantage is arranged:

Because first water filling pressure break coal seam makes the coal seam produce the crack, the pressure that has produced when the interaction of blister band has reduced explosion inside and outside adding, after the actual explosion, block coal rate can reach about 45%, has improved the whole price and the benefit of coal.Coal wall caving point reduces, and is difficult for the support that collapses, and has guaranteed safety in production.

The specific embodiment

In rib interior construction boring, adopt hole packer to carry out sealing of hole along coal-face then, sealed borehole length 15m injects 10MP hydraulic pressure and carries out pressure break, and the pressure break time is controlled to be 25 minutes; At the coal-face blast hole drilling, borehole is arranged as five presbyopia according to design, amounts to 9 boreholes, borehole depth 1.3m; In borehole, insert bubble belt in the 0.2m, 2.4kg powder stick successively, insert detonator, insert bubble belt outside the 0.2m; Draw blasting wire and remain borehole with the stemming sealing; Interconnect the hole firing electric wire and bus is connected on the blaster.Onepull length is 2.3 meters, and after the explosion, block coal rate reaches 44%; Coal wall caving and the support phenomenon that collapses does not take place.

Claims (1)

1. coal-face blast charging method is characterized in that being undertaken by following operating procedure successively:

A. hole in the rib interior construction along coal-face, pressure break is carried out in the sealing of hole water filling then;

B. according to designing at the coal-face blast hole drilling, borehole is arranged as five presbyopia;

C. in borehole, insert blister band, powder stick, detonator, blister band successively;

D. draw blasting wire and remain borehole with the stemming sealing;

E. interconnect blasting wire and bus is connected on the blaster.