CN209069128U

CN209069128U - Sectional type cut structure

Info

Publication number: CN209069128U
Application number: CN201821414151.1U
Authority: CN
Inventors: 刘涛; 焦满岱; 柴衡山; 严文炳; 张晨洁
Original assignee: Northwest Research Institute of Mining and Metallurgy
Current assignee: Northwest Research Institute of Mining and Metallurgy
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2019-07-05
Anticipated expiration: 2028-08-30

Abstract

The utility model relates to a sectional type cut structure. The specific technical scheme comprises the following steps: a square cut area is arranged on a tunnel cut surface, a first group of blast holes are respectively arranged at the middle points of four sides of the square cut area, a second group of blast holes are respectively arranged at four corners of the square cut area, and a compensation hole is arranged at the center of the square cut area; charging powder at the bottoms of the first group of blastholes and the second group of blastholes to plug the orifices of the blastholes; the first set of blastholes detonate first and the second set of blastholes detonate in a delayed manner. Because the depth of the cut hole of the sectional cut structure is different along the depth of the tunneling direction, a free surface is created for blasting of the second group of blast holes after blasting of the first group of blast holes, the cut effect is increased, the blasting clamping performance of the blasting bottom is reduced, and the blasting effect of the blasting bottom is greatly improved.

Description

A kind of segmented slotting structure

Technical field

The utility model relates to a kind of segmented slotting structures.

Background technique

In tunnel excavating process, the arrangement of borehole is very crucial, determines the superiority and inferiority of route sinking and blasting effect, tradition The arrangement of borehole is divided into two classes, burn cut and angled cut substantially, wherein being applied with burn cut than wide；Strabismus The advantages of slotting, is to form compensation space effectively by outside the rock ejection aperture within the scope of slotting, be formed needed for compensation space The blasthole number wanted is few and blast hole utilization factor is high, but the required precision of borehole inclination angle is very high simultaneously, and single explosion drilling depth is limited System；Burn cut is to dig the depth of all boreholes to same depth, and all borehole bottoms are parallel, the depth and driving of borehole Depth is consistent, and blast hole utilization factor is low, and borehole is easy to produce explosion clipping, influences slotting effect.

Utility model content

The purpose of this utility model is in view of the problems of the existing technology to provide a kind of segmented slotting structure.

The specific technical solution of the utility model is as follows:

A kind of segmented slotting structure, including the square slotting region being set on tunnel slotting face, the square First group of borehole is respectively set in the midpoint on four side of slotting region, is respectively set second group on the quadrangle in square slotting region Compensation hole is arranged in borehole at square slotting regional center；First group of borehole and second group of borehole bottom hole powder charge, borehole Aperture blocked；When detonation slotting, first group of borehole detonates first, second group of borehole delay detonation.

The four side side lengths in the preferred square slotting region are 500mm, first group of borehole and second group of borehole it is straight Diameter is 38mm, and the hole depth of first group of borehole is 1.8m, and the hole depth of second group of borehole is 3m, and the diameter of compensation hole is 90mm, compensation The hole depth in hole is 3.2m；The loaded length of first group of borehole is 1.2m, and the loaded length of second group of borehole is 1m, first group of borehole Aperture stemming length with second group of borehole is 0.6m, and second group of borehole functioning delay is 50ms.

The utility model has the following beneficial effects:

1, the scope of freedom is increased

It is second after first group of hole firing since the depth of stage cutting method keyhole is different along tunneling direction depth Group hole firing creates the scope of freedom, increases slotting effect, reduces the explosion clipping of explosion bottom, so that explosion bottom Demolition effect be greatly improved；

2, the thrown results of borehole bottom are enhanced

Due to using Application of Sectional Cutting, first group of borehole hole depth is 1.8m, and first group of borehole bottom hole rock debris can easily be thrown Blasthole is thrown out, the new scope of freedom is formed, second group of borehole carries out explosion on the scope of freedom that first group of hole firing is formed, and solves Since explosion clipping causes the borehole bottom landwaste to be difficult to the problem of dishing out；

3, improve slotting condition

In tunnel piercing, the quality of demolition effect and the quantity of emptying aperture and there is important relationship.In stage cutting method, It is practical to increase for first group of keyhole detonation due to 1.8m not powder charge before second group of keyhole in first group of keyhole explosion The new scope of freedom and compensation space, increases the slotting effect of first group of keyhole, compared with traditional burn cut, the stage is drawn Slot is that loaded hole creates the more scope of freedom and compensation space, significantly improves slotting condition.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the side sectional view of Fig. 1.

Specific embodiment

A kind of segmented slotting structure as depicted in figs. 1 and 2, including the square slotting being set on tunnel slotting face Region 1, first group of borehole 2 is respectively set in the midpoint on square 1 four side of slotting region, the four of square slotting region 1 Second group of borehole 3 is respectively set on angle, compensation hole 4, the square slotting region are set at square 1 center of slotting region 1 four side side lengths are 500mm, and the diameter of first group of borehole 2 and second group of borehole 3 is 38mm, and the hole depth of first group of borehole 2 is 1.8m, the hole depth of second group of borehole 3 are 3m, and the diameter of compensation hole 4 is 90mm, and the hole depth of compensation hole 4 is 3.2m；First group of borehole 2 and second group of 3 bottom hole powder charge of borehole, the aperture 5 of borehole blocks, and the loaded length of first group of borehole 2 is 1.2m, second group of borehole 3 loaded length is 1m, and 5 stemming length of aperture of first group of borehole 2 and second group of borehole 3 is 0.6m.

When carrying out detonation slotting, first group of borehole 2 detonates first, and second group of borehole 3 postpones 50ms detonation.

Square slotting region 1 is arranged in tunnel slotting face in the utility model, on four sides and four in square slotting region 1 First group of borehole 2 and second group of borehole 3 are set on angle, first group of borehole 2 detonates first, second group of delay detonation of borehole 3, due to First group of borehole 2 reduces the minimum burden of first group of borehole 2 in the line center of second group of borehole 3, further increases Add the slotting effect of borehole, in order to make the demolition effect of first group of borehole 2 more preferably, in the center in entire slotting region 1, The compensation hole 4 of not powder charge is arranged, so that first group of borehole 2, which detonates after detonating for second group of borehole 3, forms enough compensation spaces.

Claims

1. a kind of segmented slotting structure, it is characterised in that: including the square slotting region being set on tunnel slotting face (1), first group of borehole (2) is respectively set in the midpoint on (1) four side of square slotting region, in square slotting region (1) second group of borehole (3) is respectively set on quadrangle, compensation hole (4) are set at square slotting region (1) center.

2. a kind of segmented slotting structure as described in claim 1, it is characterised in that: the square slotting region (1) Four side side lengths are 500mm, and the diameter of first group of borehole (2) and second group of borehole (3) is 38mm, the hole depth of first group of borehole (2) For 1.8m, the hole depth of second group of borehole (3) is 3m, and the diameter of compensation hole (4) is 90mm, and the hole depth of compensation hole (4) is 3.2m.

3. a kind of segmented slotting structure as described in claim 1, it is characterised in that: first group of borehole (2) and second Group borehole (3) bottom hole powder charge, the aperture (5) of borehole are blocked, and the loaded length of first group of borehole (2) is 1.2m, the The loaded length of two groups of boreholes (3) is 1m, and the aperture stemming length of first group of borehole (2) and second group of borehole (3) is 0.6m.