CN103411493A - Drilling and powder charging method for goaf-penetrating deep hole presplitting blasting - Google Patents
Drilling and powder charging method for goaf-penetrating deep hole presplitting blasting Download PDFInfo
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- CN103411493A CN103411493A CN2013103519881A CN201310351988A CN103411493A CN 103411493 A CN103411493 A CN 103411493A CN 2013103519881 A CN2013103519881 A CN 2013103519881A CN 201310351988 A CN201310351988 A CN 201310351988A CN 103411493 A CN103411493 A CN 103411493A
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Abstract
A drilling and powder charging method for goaf-penetrating deep hole presplitting blasting belongs to a drilling and powder charging method used for forced caving of deep hole presplitting blasting for lower coal mining of a goaf. A drilled hole is formed in a cutting hole. When the drilled hole is communicated with the goaf, a seamless steel pipe with the diameter slightly smaller than that of the drilled hole penetrates the goaf and reaches a room working seam goaf top plate, and then a drill bit with the diameter slightly smaller than that of the seamless steel pipe is utilized to conduct secondary drilling to the designed depth. The drilled hole is straight-line-shaped to ensure normal powder charging. In a powder charging process, a wooden tamping bar is utilized to charge a powder roll into a polyvinyl chloride (PVC) sleeve and then charge the powder roll into a blasting hole, the length of a detonating cord is determined according to the length of the blasting hole, and then blasting is conducted. The method has the advantages of being simple in process, good in operability, wide in application range and capable of effectively achieving deep hole presplitting blasting penetrating a thick hard top plate above the goaf, improving drilling blasting efficiency and ensuring safety production of a coal mine.
Description
Technical field
The present invention relates to a kind of deep hole presplitting blasting boreholes loading method, especially a kind of method of passing goaf deep hole presplitting blasting boreholes powder charge of exploiting below formula goaf, room or old working that is applicable to.
Background technology
In coal production, the normal appearance because basic top intensity is large and the thick phenomenon that causes the top board large tracts of land to be pressed in rock stratum.The outstanding large tracts of land top board revealed is the utmost point disrumpent feelings being caving in the short time, cause the cover stress redistribution and produce impact failure power, more seriously adopted the air in space by instantaneous discharge, form the extremely strong hurricane disaster of destructive power, even cause casualties and equipment damage accident, be unfavorable for the safety and high efficiency of coal resources.Practice shows, by presplit blasting top board overhead caving, reducing top board, outstanding to show up long-pending be the effective measures that prevent that the top board large tracts of land from pressing.Because the basic top thickness degree of room formula above goaf is large and lithology is harder, easily cause the top board large tracts of land to carry out the pressure power disaster, therefore need cut intraocular at lower working face of coal seam carries out the presplit blasting overhead caving, reduces the first weight step pitch and carrys out Compressive Strength.But when contiguous seams carries out broadwall under formula goaf, room, because basic top is positioned on the room mining coal seam, deep hole presplitting blasting boreholes and powder charge need be passed formula goaf, room, and these are different from common deep hole presplitting explosion, and boring and powder charge have been proposed to requirements at the higher level.Up to now, there is not yet and wear the report that formula goaf, room borehole charge carries out deep hole presplitting explosion overhead caving.
Summary of the invention
Technical problem: the objective of the invention is to overcome the deficiency in prior art, a kind of goaf deep hole presplitting blasting boreholes loading method of wearing is provided, by adding sleeve splice, creep into, the pvc pipe continuous charging, thereby hole smoothly and charge explosion, for downhole safety exploitation provides safety assurance.
Technical scheme: the goaf deep hole presplitting blasting boreholes loading method of wearing of the present invention comprises the steps:
A, contiguous seams is cut intraocular construction borehole under formula goaf, room, bores be " one " font straight line a plurality of and once creeps into boring along cutting a direction, once creeps into bore diameter and is
φ 1, length passes the once boring plagioclase of immediate roof for tilting
l 1 , the spacing of wells and the degree of depth are determined according to basic rimrock stone mechanical property and thickness;
When b, boring and goaf are got through, first with diameter, be slightly less than bore diameter
φ 1Seamless steel pipe pass goaf, after arriving room mining coal seam goaf top board, the drill bit secondary that is slightly less than seamless steel pipe with diameter creeps into, until projected depth; Described seamless steel pipe diameter is
φ 2, length is the secondary drilling plagioclase from origin or beginning to goaf top plate
l 2 Described secondary creeps into bore diameter
φ 3, length is
l 3 -
l 2 , complete the construction of borehole;
C, borehole is implemented to powder charge, its process is as follows:
(1) on ground, in advance explosive and stemming are installed, until the advance of the face, together with the timber wedge of plugged perforation, be transported to down-hole during to the powder charge position and install;
(2) first peace and quiet borehole before powder charge, use wooden tamper that powder stick is packed into after the PVC sleeve pipe and packed in the big gun hole, according to the big gun hole length, determine primacord length, at the bottom of powder stick is pushed into to hole, load real, adopt continuous coupling manner powder charge, and adopt double detonator, primacord to ignite, wherein the primacord two ends all extend to the borehole bottom, and fix with stopper, and double detonator exposes the primacord connection in series-parallel with the big gun hole and is connected, the bus of blowing out is unsettled to be hung, adopt the copper core to blow out line, all boreholes all adopt a powder charge of forward, segment blast;
(3) extremely closely knit with yellow mud filling plugged perforation, after completing, plugged perforation carries out line, and then adopt the cap sensitive primacord to blow out.
Beneficial effect, owing to having adopted such scheme, the present invention can make drilling rod pass goaf normal charge, enforcement explosion, to guarantee the successful implementation of basic top presplit blasting.When the present invention exploits below formula goaf, room or old working, by at lower working face of coal seam, cutting intraocular, carry out the presplit blasting overhead caving, efficiently solve and wear the thick plate deep hole presplitting explosion difficult problem of resisting stubbornly of above goaf, for due to the basic top thickness of above goaf and hard, easily cause large tracts of land to press the efficiency of disaster problem, raising drillhole blasting that a new approach is provided, guarantee Safety of Coal Mine Production.Its major advantage has:
(1) efficiently solving boring while wearing goaf or old working creeps into and the continuous charging problem continuously;
(2) adopt the drilling rod of three kinds of different-diameters to realize wearing the goaf powder charge, construction technology is simple, workable;
(3) the method can be used for wearing the empty caves such as formula goaf, room, old working, applied widely.
The accompanying drawing explanation
Fig. 1 is formula goaf, room of the present invention below coal seam deep hole presplitting explosion overhead caving horizontal layout schematic diagram;
Fig. 2 is the A-A profile of Fig. 1;
Fig. 3 (a) is enforcement borehole boring step 1 structural representation of the present invention;
Fig. 3 (b) is enforcement borehole boring step 2 structural representation of the present invention;
Fig. 3 (c) is enforcement borehole boring step 3 structural representation of the present invention.
In figure: the 1-seat earth, the 2-working seam, the 3-immediate roof, 4-room formula coal column, 5-pushes up substantially, the 6-point of cutting of coal face, the 7-haulage way, the 8-tailgate, No. 1 boring-B(1), No. 2 boring-B(2), No. n boring-B(n), No. n+1 boring-B(n+1)
L-face length,
l 1 -the plagioclase of once holing,
l 2 -secondary drilling plagioclase,
l 3 -boring total length,
D-two drilling horizontal spacings,
α-boring and top board angle,
φ 1-once creep into bore diameter,
φ 2-seamless steel pipe diameter,
φ 3-secondary creeps into bore diameter.
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
In Fig. 1 Fig. 2, seat earth 1 also can be described as the direct end; Working seam 2 adopts the comprehensive mechanized coal mining method exploitation; Immediate roof 3 is between formula goaf, the room of working seam 2 and top; Room formula coal column 4 is that coal column is left in the formula goaf, room formed after the formula coal-mining method exploitation of employing room, coal seam, top; Basic top 5 i.e. old top; Point of cutting of coal face 6 is tunnels for the installation fully-mechanized mining equipment of digging in coal seam; Haulage way 7 is mainly used in installing rubber conveyer transportation coal; Tailgate 7 is mainly used in discharging the dirty wind in working face.The goaf deep hole presplitting blasting boreholes loading method of wearing of the present invention, concrete steps are as follows:
A, in fully-mechanized mining working, length is below formula goaf, room
LThe intraocular of cutting carry out bore operation, contiguous seams is cut intraocular construction borehole under formula goaf, room, along cutting a direction, bore a plurality of borings that are " one " font straight line, as shown in Figure 1: No. 1 boring-B(1), No. 2 boring-B(2), No. n boring-B(n), No. n+1 boring-B(n+1), boring with the immediate roof angle be
α, the two parallel spacings of wells are
D, after passing immediate roof 3, boring enters goaf, and the employing rig carries out bore operation, once creeps into bore diameter and is
φ 1, length passes the once boring plagioclase of immediate roof 3 for tilting
l 1 , the spacing of wells and the degree of depth are determined according to basic rimrock stone mechanical property and thickness;
B, once creep into hole and goaf while getting through, enter formula goaf, room due to boring after passing immediate roof 3, first with diameter, be slightly less than and once creep into bore diameter
φ 1Seamless steel pipe pass goaf, after arriving room formula goaf top plate, the drill bit secondary that is slightly less than seamless steel pipe with diameter creeps into, until projected depth, and requires boring to be a straight line, to guarantee normal charge; Described seamless steel pipe diameter is
φ 2, length is the secondary drilling plagioclase from origin or beginning to room formula goaf top plate
l 2 Described secondary creeps into bore diameter
φ 3, length is
l 3 -
l 2 , wherein
l 3 For the boring total length, complete the construction of borehole;
C, borehole is implemented to powder charge, its process is as follows:
(1) borehole adopts continuous coupling manner powder charge, first on ground, in advance explosive and stemming is installed, and until the advance of the face, together with the timber wedge of plugged perforation, is transported to down-hole during to the powder charge position and installs;
(2) first peace and quiet borehole before powder charge, used wooden tamper that powder stick is packed into after the PVC sleeve pipe and packed in the big gun hole, determines primacord length according to the big gun hole length, and primacord cuts with sharp knife, forbids impact extruded; At the bottom of powder stick is pushed into to hole, load in fact, yellow mud wants filling closely knit, then blows out.Adopt continuous coupling manner powder charge, and adopt double detonator, primacord to adopt cap sensitive, wherein the primacord two ends all extend to the borehole bottom, and fix with stopper, double detonator exposes the primacord connection in series-parallel with the big gun hole and is connected, the bus of blowing out adopts the copper core to blow out line, must insulation good, and unsettled hanging.All boreholes all adopt a powder charge of forward, segment blast;
(3) extremely closely knit with yellow mud filling plugged perforation, after completing, plugged perforation carries out line, and then adopt the cap sensitive primacord to blow out.
Claims (1)
1. wear goaf deep hole presplitting blasting boreholes loading method for one kind, it is characterized in that, comprise the steps:
A, contiguous seams is cut intraocular construction borehole under formula goaf, room, bores be " one " font straight line a plurality of and once creeps into boring along cutting a direction, once creeps into bore diameter and is
φ 1, length passes the once boring plagioclase of immediate roof for tilting
l 1 , the spacing of wells and the degree of depth are determined according to basic rimrock stone mechanical property and thickness;
When b, boring and goaf are got through, first with diameter, be slightly less than bore diameter
φ 1Seamless steel pipe pass goaf, after arriving room mining coal seam goaf top board, the drill bit secondary that is slightly less than seamless steel pipe with diameter creeps into, until projected depth; Described seamless steel pipe diameter is
φ 2, length is the secondary drilling plagioclase from origin or beginning to goaf top plate
l 2 Described secondary creeps into bore diameter
φ 3, length is
l 3 -
l 2 , complete the construction of borehole;
C, borehole is implemented to powder charge, its process is as follows:
(1) on ground, in advance explosive and stemming are installed, until the advance of the face, together with the timber wedge of plugged perforation, be transported to down-hole during to the powder charge position and install;
(2) first peace and quiet borehole before powder charge, use wooden tamper that powder stick is packed into after the PVC sleeve pipe and packed in the big gun hole, according to the big gun hole length, determine primacord length, at the bottom of powder stick is pushed into to hole, load real, adopt continuous coupling manner powder charge, and adopt double detonator, primacord to ignite, wherein the primacord two ends all extend to the borehole bottom, and fix with stopper, and double detonator exposes the primacord connection in series-parallel with the big gun hole and is connected, the bus of blowing out is unsettled to be hung, adopt the copper core to blow out line, all boreholes all adopt a powder charge of forward, segment blast;
(3) extremely closely knit with yellow mud filling plugged perforation, after completing, plugged perforation carries out line, and then adopt the cap sensitive primacord to blow out.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266557A (en) * | 2014-07-31 | 2015-01-07 | 山东华联矿业股份有限公司 | Precontrol roof sublevel ore breaking once shaft forming method |
| CN103791786B (en) * | 2014-03-12 | 2015-07-08 | 中铁二局股份有限公司 | Underground diaphragm wall bed rock grooving pre-splitting blasting method |
| CN105865279A (en) * | 2016-04-15 | 2016-08-17 | 中国矿业大学(北京) | Block cutting type cut hole forced caving detonation method |
| CN106643355A (en) * | 2017-01-19 | 2017-05-10 | 中国矿业大学(北京) | Forced roof caving method for hugely-thick hard roof in deep coal mine |
| CN109470100A (en) * | 2018-12-25 | 2019-03-15 | 中矿科创(北京)煤炭技术有限公司 | A kind of coal mine roof plate Deephole pre-splitting blasting method |
| CN110553558A (en) * | 2019-07-21 | 2019-12-10 | 西山煤电(集团)有限责任公司 | Deep hole presplitting blasting method during initial mining and initial setting period of working face of extra-thick coal seam |
| CN111622758A (en) * | 2020-05-15 | 2020-09-04 | 中煤科工开采研究院有限公司 | Pressure relief method for relieving rock burst disaster |
| CN112033245A (en) * | 2020-09-14 | 2020-12-04 | 中国矿业大学(北京) | Long-distance blast hole charging device and charging method |
| CN113654422A (en) * | 2021-08-17 | 2021-11-16 | 华能铜川照金煤电有限公司西川煤矿分公司 | Forced caving technical scheme for advanced presplitting blasting of two ends of working face |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791786B (en) * | 2014-03-12 | 2015-07-08 | 中铁二局股份有限公司 | Underground diaphragm wall bed rock grooving pre-splitting blasting method |
| CN104266557A (en) * | 2014-07-31 | 2015-01-07 | 山东华联矿业股份有限公司 | Precontrol roof sublevel ore breaking once shaft forming method |
| CN105865279A (en) * | 2016-04-15 | 2016-08-17 | 中国矿业大学(北京) | Block cutting type cut hole forced caving detonation method |
| CN105865279B (en) * | 2016-04-15 | 2017-06-23 | 中国矿业大学(北京) | Stripping and slicing formula cuts an overhead caving blasting method |
| CN106643355A (en) * | 2017-01-19 | 2017-05-10 | 中国矿业大学(北京) | Forced roof caving method for hugely-thick hard roof in deep coal mine |
| CN106643355B (en) * | 2017-01-19 | 2019-07-09 | 中国矿业大学(北京) | A kind of overhead caving method of the huge thick tight roof of deep coalmine |
| CN109470100A (en) * | 2018-12-25 | 2019-03-15 | 中矿科创(北京)煤炭技术有限公司 | A kind of coal mine roof plate Deephole pre-splitting blasting method |
| CN110553558A (en) * | 2019-07-21 | 2019-12-10 | 西山煤电(集团)有限责任公司 | Deep hole presplitting blasting method during initial mining and initial setting period of working face of extra-thick coal seam |
| CN111622758A (en) * | 2020-05-15 | 2020-09-04 | 中煤科工开采研究院有限公司 | Pressure relief method for relieving rock burst disaster |
| CN112033245A (en) * | 2020-09-14 | 2020-12-04 | 中国矿业大学(北京) | Long-distance blast hole charging device and charging method |
| CN112033245B (en) * | 2020-09-14 | 2021-08-13 | 中国矿业大学(北京) | Long-distance blast hole charging device and charging method |
| CN113654422A (en) * | 2021-08-17 | 2021-11-16 | 华能铜川照金煤电有限公司西川煤矿分公司 | Forced caving technical scheme for advanced presplitting blasting of two ends of working face |
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Application publication date: 20131127 |