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Large span blast hole groove broaching process

A large-span, blasthole technology, applied in ground mining, earth-moving drilling, underground mining, etc., can solve the problems of low trough efficiency, poor safety, complex production organization, etc., and achieve simple construction, convenient management, and large span. Effect

Inactive Publication Date: 2005-07-06
宝钢集团上海梅山有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this process to pull grooves, the production organization is complicated, the safety is poor, and the initial groove pulling efficiency is very low

Method used

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  • Large span blast hole groove broaching process
  • Large span blast hole groove broaching process
  • Large span blast hole groove broaching process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: the 18-24 meter long roadway 2 top surface is divided into left and right groups according to the principle of symmetry, and each large group of roadway top surface starts from the symmetrical plane 3 and drills 3 groups of blastholes 1 from the symmetrical plane 3 to both sides. The symmetry plane 3 is called the first group, the second group and the third group successively from the inside to the outside. The third group drills 3 rows of blastholes 1, and each row drills 4 blastholes 1. The other groups drill 2 rows of blastholes 1, and each row drills 2 rows of blastholes 1. Drill 4 blastholes 1, two large groups of blastholes are symmetrical to each other, the diameter of the blastholes 1 is 100 mm, the longitudinal distance between the blastholes of the same row of blastholes 1 is 1.0 meters, the minimum resistance line is 2.2 meters, and the blastholes The value of the hole density coefficient is 0.5, and the angle of the first row of blastholes is 50...

Embodiment 2

[0014] Embodiment 2: divide the 18~24 meter long roadway 2 tops into two groups, left and right according to the principle of symmetry, and each large group of roadway tops starts from the symmetrical plane 3 and drills 4 groups of blastholes 1 to both sides. The team drilled 2 rows of blastholes 1, and each row drilled 5 blastholes 1. The blastholes in the two groups were symmetrical to each other. The diameter of the blastholes 1 was 95 mm, and the longitudinal distance between the blastholes in the same row was 0.9 meters. The value of the minimum resistance line is 2.3 meters, the value of the density coefficient of blastholes is 0.45, and the angle of the first row of blastholes is 52°; when blasting, two groups of blastholes 1 are blasted each time, and a small group of blastholes 1 is blasted on the left and right sides of the symmetrical plane 3. The blasting sequence starts from From the side of the symmetry plane 3, start from the inside to the outside, first blast th...

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PUM

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Abstract

A large span blast hole trench excavated process is disclosed. Separating the roadway top surface to left and right group symmetrically, drilling 2 to 5 subgroups of blast holes from symmetry plane to both sides in each group of roadway top surface, drilling 2 to 3 rows of blast holes for each subgroup, drilling 3 to 5 blast holes for each row, keep the blast holes of the two group in symmetry. The blasting should carried out from symmetry plane from inside to outside in order, each time two subgroups of symmetrical blast holes being blasted, then enters normal trench excavating region after the whole blast holes finish blasting. The beneficial effect of the present invention lies in that it completely adopts blast holes to excavate trench leading to a simple operation and convenient management, the initial formed cutting trench has a large span which accelerate the supply of back reduction condition.

Description

1. Technical field: [0001] The invention relates to an underground mining technology, which is a cutting and slotting process, in particular to a large-span blast hole slotting process. 2. Background technology: [0002] The groove cutting process in mining technology is the first process for mining to enter a new level and for a new panel area. The quality of the groove pulling effect directly affects the normal production preparation and follow-up work in the area, and may even cause a decline in mine output. Generally, the cutting and pulling grooves of mines adopt the raising fluting process, that is, the cutting raising is firstly constructed on the top of the roadway, and then the blast holes are constructed on both sides of the raising, and the cutting grooves are formed after blasting in a certain order. Using this process for slotting, the production organization is complicated, the safety is poor, and the initial slotting efficiency is very low. 3. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
Inventor 范庆霞
Owner 宝钢集团上海梅山有限公司