CN101349533A

CN101349533A - Dip laneway digging hole layout mode

Info

Publication number: CN101349533A
Application number: CNA2008101387783A
Authority: CN
Inventors: 王洪立; 张宪堂; 陈士海; 周红敏; 鲍伟
Original assignee: SCIENCE TECHNOLOGY INDUSTRY CO SHANDONG SCIENCE AND TECHNOLOGY UNIV
Current assignee: SCIENCE TECHNOLOGY INDUSTRY CO SHANDONG SCIENCE AND TECHNOLOGY UNIV
Priority date: 2008-08-05
Filing date: 2008-08-05
Publication date: 2009-01-21
Anticipated expiration: 2028-08-05
Also published as: CN101349533B

Abstract

The invention discloses a mine downhill roadway tunnelling shot hole arrangement way, which comprises cut holes, auxiliary holes, a peripheral hole and a bottom hole, wherein the cut holes are in a wedge arrangement way, and are arranged on the middle upper portion of a roadway cross section, wherein the pitch of two rows of wedge cut holes is larger 30% than the pitch of current wedge cut holes, a row of auxiliary straight holes are arranged between two rows of wedge cut holes, and the width of the auxiliary straight hole is 0.5 time than that of the cut holes, and a row of auxiliary throwing holes are further arranged under the two rows of the cut holes, and the drilling direction of the auxiliary throwing holes is drilled to the oblique upper portion in smaller than 90 degrees with the roadway cross section, and the auxiliary throwing holes are finally detonated with the bottom hole in the same section. The invention fully utilizes the least resistance line principle, reasonably distributes the wedge cut holes, and increases the blasting efficiency and tunnelling velocity.

Description

A kind of dip laneway digging hole layout mode

Technical field

The invention belongs to the mining excavation technology, especially the drill eye blasting method.

Background technology

In coal mining, open up a large amount of underground passages, generally all adopt drilling and blasting method.Borehole generally is divided into snubber, reliever, periphery hole, end eye; Arrangement is, the drift section middle and lower part is a snubber, be reliever (or claiming avalanche eye) around the snubber, and it is periphery hole that section top and two is helped on the outline line, and the base outline line is an end eye.Because the tunnel belongs to the explosion of single scope of freedom, snubber is the key of demolition effect.The type of arrangement of snubber is a lot, comprises V-cut eye (being the V-arrangement slotting), cone cut eye and fan cut eye.Wherein the V-cut eye is made up of two row's inclined holes, and two row's spacings are decided according to the section size, are generally 0.5-1.0 rice, though these cutting methods application are many, blasting efficiency promptly bores 2 meters borehole all below 85%, about 1.7 meters of length of shot.Especially the working face blast hole utilization factor of go-downhill roadway is lower, and quick-fried heap can not be dished out on request after the explosion, be deposited on the working face, had a strong impact on raking loader work, thereby increased the engineering time of concerned process steps, break the normal construction circulation, cause existing tunneling construction speed can not satisfy construction period.Therefore reasonable Arrangement borehole mode is the key that addresses the above problem.

Summary of the invention

The present invention can not effectively cast the working face problem aside for solving the low and quick-fried back of go-downhill roadway driving blasting efficiency sillar, proposes a kind of new borehole arrangement.

A kind of dip laneway digging hole layout mode, it comprises snubber, reliever, periphery hole and end eye, snubber is the wedge-shaped arrangement mode, it is characterized in that, snubber is arranged in the drift section middle and upper part, and wherein the existing V-cut eye spacing of gap ratio of two row's V-cut eyes is big by 30%, arranges the auxiliary straight eye of a row between two rows, the degree of depth of auxiliary straight eye is 0.5 times of snubber, is used for broken large rock mass; Two rows arrange that delegation assist the throwing eye below the snubbers again, and auxiliary throwing eye jewel hole direction is with drift section＜90 ° of angles creep into obliquely upward, throw the slag distance to strengthen the throwing effect to rock, to increase, and section detonate at last together with end eye.

Good effect of the present invention is: make full use of the minimum burden principle, increase two row's wedge shapes and draw a spacing, with the broken scope of freedom of increase to rock, thereby form bigger vallecular cavity, improve blasting efficiency.The V-cut eye is arranged in the middle and upper part, arrange to go up the auxiliary throwing eye that creeps on tiltedly below, and detonate at last with section with end eye, thereby the thrown direction of sillar after the change explosion, quick-fried heap is beneficial to raking loader work away from operating surface after making explosion, for follow-up explosion provides the better scope of freedom, thereby accelerate cyclic advance, improve driving speed.

Description of drawings

Fig. 1 is a borehole cross sectional plane layout drawing of the present invention;

Fig. 2 is the sectional drawing of 20-13-11-1-4-18-19 gunfire eye among Fig. 1;

Fig. 3 is the sectional drawing of 26-8-2-15-13 gunfire eye among Fig. 1.

The specific embodiment

Embodiment is an inclination angle W=23 ° a go-downhill roadway.Driving borehole arrangement as shown in Figure 1-Figure 3.As can be seen from Figure 1 it is furnished with 49 boreholes altogether, wherein is the auxiliary straight eye of slotting, the dark h=0.8-1.0 rice of eye 1-3 number; Two rows are arranged in the drift section middle and upper part for the V-cut eye about being divided into for 4-7 number and 8-11 number, two row's spacing a=1.0-1.2 rice; Be auxiliary throwing eye 12-19 number, jewel hole direction and section are the angle of γ=85 ° and creep into obliquely upward; 20-32 number is periphery hole, be evenly arranged in that section two is helped and the overhead pulley profile on; 33-39 number is end eye, is evenly distributed on the section bottom wheel profile; All the other unnumbered boreholes are reliever, are evenly arranged on the space between snubber and the periphery.

Claims

1, a kind of dip laneway digging hole layout mode, it comprises snubber, reliever, periphery hole and end eye, snubber is the wedge-shaped arrangement mode, it is characterized in that, snubber is arranged in the drift section middle and upper part, wherein the existing V-cut eye spacing of gap ratio of two row's V-cut eyes is big by 30%, arranges the auxiliary straight eye of a row between two rows, and the degree of depth of auxiliary straight eye is 0.5 times of snubber; Two rows arrange that delegation assist the throwing eye below the snubbers again, and auxiliary throwing eye jewel hole direction is with drift section＜and 90 ° of angles creep into obliquely upward, and detonate at last for same section with end eye.