CN104819669B - Medium-length hole blasting method - Google Patents
Medium-length hole blasting method Download PDFInfo
- Publication number
- CN104819669B CN104819669B CN201510195546.1A CN201510195546A CN104819669B CN 104819669 B CN104819669 B CN 104819669B CN 201510195546 A CN201510195546 A CN 201510195546A CN 104819669 B CN104819669 B CN 104819669B
- Authority
- CN
- China
- Prior art keywords
- blasting
- hole
- charge
- explosive
- crust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a kind of medium-length hole blasting method, comprise the following steps: check measurement, dynamite charge before boring, powder charge, dispose and lead quick-fried, priming device, quick-fried priming device is led in ignition.The present invention is suitable for mechanized charging and the application of on-site explosive Mixing charge, realize the optimal coupling of explosive and blasthole hole wall, prevent the explosive leakage waste caused because of underground opening, crack, eliminate the potential safety hazard caused because of the hole type patent medicine kettle that is connected with big gun hole, reduce manual work risk, improve the utilization rate of explosive.
Description
Technical field
The present invention relates to engineering explosion field, particularly relate to medium-length hole blasting method.
Background technology
Along with mechanized charging and the popularization of on-site explosive Mixing charge, the level of security of blasting engineering and machinery
Change degree achieves breakthrough progress.Along with the raising of world technology level, blasting engineering quotes machinery
Automation equipment is inevitable development trend.
The main process of medium-length hole blasting, is to be transported to inside blasting hole by explosive, then uses initiating equipment
Ignition fulfils assignment.But, current explosive shape is broadly divided into powdery, pulpous state and aqueous three classes, is inciting somebody to action
When explosive is transported in blasting hole, due to can exist under the conditions of different engineering geological various different hole and
Crack, big gun hole becomes Great possibility, hole and crack through the hole crack in ground and connects with big gun hole,
The explosive loading big gun hole flows in hole and crack, and explosive will certainly be caused to leak, or the hole adjacent in big gun hole
In crack, hole, form medicine kettle, change burden, form potential safety hazard, or cause the waste of explosive.
At present, in all kinds of surface mines, stone pit and other outdoor medium-length hole blasting operation, big gun hole checks
Exist invisible, it is impossible to survey, or use expensive acoustic detection device, but detection data is reliable
Property is not good enough.The dynamite charge overwhelming majority uses manual method, is disclosed one by one by package finished explosive products with tamper
Enter big gun hole, then clog aperture.This method powder stick is poor with big gun hole wall coupling, and labor strength is big, makees
Industry inefficiency, the dangerous height of workman's operation simultaneously.Also part is had to use mechanization loading mode by bulk
Explosive directly inputs the method in big gun hole, but cannot tackle the internal hole crack existed, big gun hole, causes explosive
Leakage waste, efficiency degradation, more cannot eliminate formation medicine kettle in the hole being connected with big gun hole and be caused
Potential safety hazard.
Just because of the existence of problem above, seriously constrain the development of medium-length hole blasting mechanized charging, special
It not the popularization and application of on-site explosive this advanced technology of mixed explosive.
Summary of the invention
Based on this, for the problems referred to above, it is necessary to propose a kind of medium-length hole blasting method, in big gun hole point
The hole crack of cloth, uses blasting charge crust to be introduced directly into inside blasting hole and carries out dynamite charge, eliminate
Because explosive leakage and medicine kettle form the potential safety hazard caused, it is suitable for mechanized charging and on-site explosive loads in mixture skill
The application of art, it is to avoid Traditional Man operation is inefficient, reduces manual work risk, adds the profit of explosive
By rate.
The technical scheme is that a kind of medium-length hole blasting method, comprise the following steps:
A, boring: use rig downward Drilling blasting hole, set blasting hole diameter d=50mm～
400mm, blast hole depth l=5m～30m, blasting hole is positioned at straight line and the horizontal plane angle α of its length direction
=45 °～90 °；
Check measurement before b, powder charge: whether the detection diameter of blasting hole, the degree of depth, gradient reach to design is wanted
Ask, observe, shoot and position the hole within blasting hole and crack, determine corresponding explosion disposal method；
C, dynamite charge: for the hole crack of distribution in big gun hole, lay outside the blasting charge bottom blasting hole
Skin, and outside the blasting charge Intradermal fill the most bottom-up preset explosive charge, filled after seal formation
The blasting charge；Inert material is laid as the wall between two blastings charge above the blasting charge after sealing；From
Under supreme be arranged alternately the blasting charge and wall successively until blasting hole is preset at blocking position；
Quick-fried, priming device is led in d, arrangement: arranges in blasting hole and leads quick-fried, priming device, and uses tamper
The opening part of blasting hole is blocked；
Quick-fried priming device is led in e, ignition.
In the present invention, in the big gun hole being drilled under different engineering geological condition, there is the connection of hole crack
Situation, after blasting hole Drilling completes, also need to detect device to the position of blasting hole, blast hole depth,
The parameter such as hole within blasthole diameter and big gun hole and fractured zones inspects for acceptance, then to being drilled
Borehole carries out scarfing cinder and draining.
The powder charge process of the present invention is to use mechanized charging, first to blasting hole internal importing blasting charge crust,
Again by the powder charge machine explosive charge that intradermal delivery is preset outside the blasting charge, powder charge is complete, and direct envelope is formed
The blasting charge, then above the blasting charge, lay the isolation as adjacent two blastings charge of the one layer of inert material sealing coat
Band, can the fill blasting charge again on sealing coat.The present invention adapts to the requirement of loading machinery, also improves simultaneously
Working performance.
Preferably, before carrying out step a, also include design and determine the parameter of blasting hole, explosive
Dosage and the modes of emplacement of the blasting charge, owing to blasthole diameter and the corresponding blasting charge of explosion ground are straight
There is vital impact in footpath on blasting engineering, so, in explosion early stage, the diameter of design blasting hole,
The degree of depth, Holespacing and array pitch, explosive kind and the number of blasting hole, arrangement mode and arrangement position
Blasting engineering is had vital effect.
Preferably, between step a and b, also include cleaning rock slag within blasting hole and waste liquid, no
The blasting hole got with the rock-soil layer of geology is different, there will be big inside the blasting hole that some areas are got
The hydrops of amount, in order to not affect blasting quality, before blasting charge bag, it is necessary to by internal rock slag and hydrops
Clean out.
Preferably, described step b also includes step in detailed below:
B1, with ocular estimate observe blasting hole profile whether have deformation or subside；
B2, with inside caliper measure blasting hole diameter, with measure the fathom amount blasting hole degree of depth, utilization is inclined
Slope-measuring instrument is measured blasting hole and is positioned at straight line and the horizontal plane angle α of its length direction；
B3, utilize the detection equipment of band photographic head, transfer to blasting hole internal observation, shoot and position quick-fried
Break the hole within big gun hole and crack；
B4, according to the image parameter that collects, determine the processing scheme in hole crack within blasting hole.
Preferably, described step c also includes step in detailed below:
C1, to blasting hole laid inside blasting charge crust；
C2, loading pipeline Intradermal outside the blasting charge is utilized successively by the explosive of bottom up fill predetermined amount, to make
The outer surface of blasting charge crust is fitted with blasting hole inwall gapless；
C3, by blasting charge crust seal, formed the blasting charge.
Preferably, described blasting charge crust is flexible protective film bag, flexible material can preferably ensure explosive and
Blasting hole inwall gapless is fitted, and this structure can maximally utilise the energy of explosive release.
Preferably, the position that hole Fracture Width is bigger at big gun hole depth, use 2 layers or layer flexible protection
Film bag does blasting charge crust.To ensure that the intensity of blasting charge crust can bear explosive and multiple-row blasting thing in big gun hole
The static pressure produced, it is ensured that medicated bag will not rupture, eliminates because explosive leakage and medicine kettle form the potential safety hazard caused
Meanwhile, make explosive not leak, stably detonate, propagation of explosion.
Preferably, the thickness of described blasting charge crust is 0.03mm～2mm, and present explosive is mainly powdery
Explosive, bulk explosive, three kinds of forms of aqueous explosive, the thickness degree of blasting charge crust also directly affects explosive
Laminating degree with blasting hole inwall.The blasting charge and the good coupling of blasting hole, it is ensured that during explosive charge
The energy produced is on the wall of blasting hole so that it is given play to optimum efficiency and usefulness, to greatest extent profit
With releasing energy of explosive.
The invention has the beneficial effects as follows:
(1) use flexible protective film bag as blasting charge crust, it is to avoid explosive leaks to big gun hole inner void,
Ensure simultaneously explosive in blasting hole with the optimal coupling of blasting hole inwall so that it is can land productivity to greatest extent
With releasing energy of explosive；
(2) in the internal directly fill of blasting hole, the poor efficiency of Traditional Man powder charge is changed；
(3) it is suitable for mechanized charging, is particularly suitable for the application of on-site explosive Mixing charge, improve explosion and make
The efficiency of industry；
(4) reduce manual work risk, improve the utilization rate of explosive；
(5) effectively prevent explosive in powder charge process from leaking into the hole type patent medicine kettle being connected with big gun hole, thoroughly disappear
Except medicine kettle changes the potential safety hazard that burden causes.
Accompanying drawing explanation
Fig. 1 is the flow chart of the embodiment of the present invention 1；
Fig. 2 is the detection device schematic diagram of the embodiment of the present invention 4；
Fig. 3 is the camera assembly schematic diagram of the embodiment of the present invention 4；
Fig. 4 is the blasting agent mixing transport vehicle charge constitution schematic diagram of the embodiment of the present invention 5；
In figure, 10-camera assembly, 20-pulls rope, 30-human-computer interaction device, 40-blasting hole, and 50-explodes
Medicated bag crust, 60-explosive, 70-loading pipeline, 80-blasting agent mixing transport vehicle.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are described in detail.
Embodiment 1:
A kind of medium-length hole blasting method, as it is shown in figure 1, comprise the following steps:
S1, boring: use rig downward Drilling blasting hole, set blasting hole diameter d=50mm～
400mm, blast hole depth l=5m～30m, blasting hole is positioned at straight line and the horizontal plane angle α of its length direction
=45 °～90 °；
Check measurement before S2, powder charge: whether the detection diameter of blasting hole, the degree of depth, gradient reach design
Requirement, observes, shoots and positions the hole within blasting hole and crack, determines corresponding explosion disposal method；
S3, dynamite charge: for the hole crack of distribution in big gun hole, lay the blasting charge bottom blasting hole
Crust, and outside the blasting charge Intradermal fill the most bottom-up preset explosive charge, filled after seal shape
Become the blasting charge；Inert material is laid as the wall between two blastings charge above the blasting charge after sealing；
It is arranged alternately the blasting charge and wall the most successively until blasting hole is preset at blocking position；
Quick-fried, priming device is led in S4, arrangement: arranges in blasting hole and leads quick-fried, priming device, and with blocking
The opening part of blasting hole is blocked by thing；
Quick-fried priming device is led in S5, ignition.
Specifically, as in Bench mining in the open, owing to blasthole diameter and the corresponding blasting charge of rock are straight
There is vital impact in footpath on blasting work, so, in explosion early stage, blasting hole also should be designed
The number of diameter, the degree of depth, inclination angle and blasting hole, arrangement mode and arrangement position.The present embodiment is with quick-fried
Broken blasthole diameter is 150mm, and the blasting hole degree of depth is 15m, and the angle of blasting hole and horizontal plane is 90 ° and is
Example.The method using the present invention, first clears up burst region, then punches with rig, this reality
Execute the punching of example preferred hidden hole drilling.
The most current medium-length hole blasting engineering charging, the most obvious shortcoming is exactly mechanization degree total water
Flat the highest, hand labor intensity is big, and work efficiency is low, therefore, and the introducing of mechanized equipment, and solve
Wherein there is the progress that bottlenecks is a great-leap-forward for blasting engineering.
Further, also need to do homework before blasting hole powder charge, first to the diameter of blasting hole,
The parameters such as the degree of depth carry out an acceptance inspection, and measure whether the position of blasting hole, quantity and the angle with horizontal plane accord with
Close requirement, then the blasting hole being drilled is carried out scarfing cinder, clear water.
Further, also need to carry out the inspection work in inner void, crack, this enforcement before blasting hole powder charge
Example preferably band photographic head and the detection equipment of measurement rope, utilize gravity extension to enter inside blasting hole, see
Survey, shoot the size cases in inner void crack, and it is positioned.Finally utilize collect data,
Image determines big gun hole disposal method.
Further, after confirming that blasting hole is qualified, charging work can be carried out.Must be according to during powder charge
Pre-designed explosive payload loads.Charge constitution can be with continuous charging, it is also possible to spaced loading.This enforcement
The preferred continuous charging of example, imports one layer of blasting charge crust inside blasting hole, described blasting charge crust
Thickness is 0.2mm, utilizes loading pipeline from explosive transport vehicle to Intradermal fill explosive the blasting charge, and fill completes
The formation blasting charge can be sealed.Whole powder charge process realizes in blasting hole, it is to avoid Traditional Man powder charge
Poor efficiency, reduces labor strength.
Further, also need to lay one layer of inert material wall between adjacent two blastings charge so that it is
Form discontinuous spaced loading structure.
Further, after blasting hole powder charge, remaining opening portion is typically necessary blocking, stemming length 4m,
The purpose of blocking is to stop high temperature detonation gas product to go out aperture prematurely inside blasting hole, it is ensured that
Explosive completely and forms higher detonation pressure at blasting hole internal-response, improves effective profit of explosion gas
By rate, thus the energy giving full play to explosive carrys out fractured rock and improves blasting quality.The present embodiment preferably hinders
Plug material carries out sealing blocking to blasting hole.Described blocking material generally uses Sha Heni in the proper ratio
Rub up and make.
Further, quick-fried device is led in the employing of detonating of blasting hole, and the present embodiment preferably leads quick-fried device for leading
Quick-fried rope.After confirming shotfiring safety, it is achieved ignite.
Embodiment 2:
The present embodiment is in place of the difference of embodiment 1, a diameter of 50mm of described blasting hole, explosion
It is 45 ° with horizontal plane angle α that big gun hole is positioned at the straight line of its length direction, and the degree of depth of blasting hole is 5m, fried
The thickness of medicated bag crust is 0.03mm.
Embodiment 3:
The present embodiment is in place of the difference of embodiment 1, a diameter of 400mm of described blasting hole, explosion
It is 60 ° with horizontal plane angle α that big gun hole is positioned at the straight line of its length direction, and the degree of depth of blasting hole is 20m,
The thickness of blasting charge crust is 2mm.
Embodiment 4:
The present embodiment is in place of the difference of embodiment 1, use following structure observation, shoot and position quick-fried
Broken hole within big gun hole and crack:
Structure is detected, as shown in Figure 2 and Figure 3, including by photographic head 101, illuminating lamp 102 described in the present embodiment
With the camera assembly 10 of protective housing 103 composition, pull rope 20 and human-computer interaction device 30, described shooting
101 to be located at protective housing 103 internal, power supply described containment vessel is located at by the described illuminating lamp 102 powered
The lens direction one of body 103 inside front, the illumination direction of described illuminating lamp 102 and described photographic head 101
Causing, the signal output part of described photographic head 101 is connected with the signal input part of described human-computer interaction device 30,
Described camera assembly 10 with pull rope 20 one end is connected, described in pull restrict 20 the other end have and pull
The union joint that device connects.
Structure described in the present embodiment is provided with protective housing and intensity adjustable illuminating lamp 102, protection shooting
101 from collsion damage, can control big gun hole interior lamp brightness simultaneously, improves image quality, can be with
Time shooting blasting hole internal pictures and location positioning, it is achieved mode is simple.
Embodiment 5:
The present embodiment is in place of the difference of embodiment 1, as shown in Figure 4, uses blasting agent mixing transport vehicle
80 carry out powder charge, and its structure is:
The charge constitution of blasting agent mixing transport vehicle is used, including blasting hole 40, the blasting charge described in the present embodiment
Crust 50 and loading pipeline 70, described blasting charge crust 50 is located at bottom blasting hole 40 and and blasting hole
40 inwall gapless laminatings, are provided with explosive 60 in blasting charge crust 50, one end of described loading pipeline 40 sets
In blasting charge opening part, the other end is provided with the combining mechanism being connected with blasting agent mixing transport vehicle 80.
Structure described in the present embodiment is suitable for medium-length hole blasting mechanized charging, mixes especially with on-site explosive
The powder charge of packing technique, improves efficiency, reduces the risk factor of hand labor intensity and manual work.
Blasting charge crust 50 described in the present embodiment is easy and the flexible protective film bag of blasting hole inwall laminating,
To ensure the good coupling of explosive and blasting hole inwall, explosive 60 is allowed to play optimum efficiency and usefulness, can be
Limits utilizes releasing energy of explosive 60.
Embodiment described above only have expressed the detailed description of the invention of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.
Claims (5)
1. a medium-length hole blasting method, it is characterised in that comprise the following steps:
A, boring: use rig downward Drilling blasting hole, set blasting hole diameter d=50mm～
400mm, blast hole depth l=5m～30m, blasting hole is positioned at straight line and the horizontal plane angle α of its length direction
=45 °～90 °；
Check measurement before b, powder charge: whether the detection diameter of blasting hole, the degree of depth, gradient reach to design is wanted
Ask, observe, shoot and position the hole within blasting hole and crack, determine corresponding explosion disposal method；
C, dynamite charge: choose flexible protective film bag as blasting charge crust, and the thickness of this blasting charge crust
For 0.03mm～2mm, for the hole crack of distribution in big gun hole, what bottom blasting hole, laying was chosen explodes
Medicated bag crust, and the position that hole Fracture Width is bigger at big gun hole depth, lay 2 layers or layer flexible protection
Film bag does blasting charge crust, the explosive charge that then Intradermal fill the most bottom-up is preset outside the blasting charge,
After filled, sealing forms the blasting charge；Inert material is laid as two blastings charge above the blasting charge after sealing
Between wall；It is arranged alternately the blasting charge and wall the most successively until blasting hole presets blocking
Position；
Quick-fried, priming device is led in d, arrangement: arranges in blasting hole and leads quick-fried, priming device, and uses tamper
The opening part of blasting hole is blocked；
Quick-fried priming device is led in e, ignition.
Medium-length hole blasting method the most according to claim 1, it is characterised in that before step a, also
Comprise the following steps:
Design and determine the parameter of blasting hole, the dosage of explosive and the arrangement of the blasting charge.
Medium-length hole blasting method the most according to claim 1, it is characterised in that step a and b it
Between, further comprising the steps of:
Clear up the rock slag within blasting hole and waste liquid.
4. according to the medium-length hole blasting method described in claim 1 or 2 or 3, it is characterised in that step b
In, comprise the following steps:
B1, with ocular estimate observe blasting hole profile whether have deformation or subside；
B2, with inside caliper measure blasting hole diameter, with measure the fathom amount blasting hole degree of depth, utilization is inclined
Slope-measuring instrument is measured blasting hole and is positioned at straight line and the horizontal plane angle α of its length direction；
B3, utilize the detection equipment of band photographic head, transfer to blasting hole internal observation, shoot and position quick-fried
Break the hole within big gun hole and crack；
B4, according to the image parameter that collects, determine the processing scheme in hole crack within blasting hole.
5. according to the medium-length hole blasting method described in claim 1 or 2 or 3, it is characterised in that step c
In, comprise the following steps:
C1, to blasting hole laid inside blasting charge crust；
C2, loading pipeline Intradermal outside the blasting charge is utilized successively by the explosive of bottom up fill predetermined amount, to make
The outer surface of blasting charge crust is fitted with blasting hole inwall gapless；
C3, by blasting charge crust seal, formed the blasting charge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195546.1A CN104819669B (en) | 2015-04-23 | 2015-04-23 | Medium-length hole blasting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195546.1A CN104819669B (en) | 2015-04-23 | 2015-04-23 | Medium-length hole blasting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104819669A CN104819669A (en) | 2015-08-05 |
| CN104819669B true CN104819669B (en) | 2016-08-17 |
Family
ID=53730046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510195546.1A Active CN104819669B (en) | 2015-04-23 | 2015-04-23 | Medium-length hole blasting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104819669B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651127B (en) * | 2016-01-28 | 2017-04-12 | 中钢集团马鞍山矿山研究院有限公司 | Charge system for advance rock breaking of surface mine |
| CN109506528B (en) * | 2017-09-14 | 2024-05-14 | 广东锡源***科技股份有限公司 | Manual drainage device and method for open-air medium-length hole blasting |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2491692A (en) * | 1945-11-08 | 1949-12-20 | Edwin J Shimek | Borehole explosive charge |
| US2920523A (en) * | 1957-06-04 | 1960-01-12 | Airmite Midwest Inc | Method of charging water-filled blast holes with ammonium nitrate and primer cartridge used in same |
| CN102220866B (en) * | 2011-04-17 | 2013-09-18 | 山东科技大学 | Pressure relief and consolidation synergizing prevention and control method for rock burst in deep coal drift |
| CN102200415A (en) * | 2011-05-19 | 2011-09-28 | 中南大学 | Deep-hole blasting construction technology in fractured rocks |
| CN102706225A (en) * | 2012-04-16 | 2012-10-03 | 广东宏大***股份有限公司 | Loading method suitable for field mixed loading of explosive and tool used for method |
-
2015
- 2015-04-23 CN CN201510195546.1A patent/CN104819669B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104819669A (en) | 2015-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104880133B (en) | High-temperature fire zone blasting device and method | |
| CN106677786B (en) | A kind of ultra-deep big cross section vertical shaft shaft formatting by one blasting method based on electric detonator | |
| Lei et al. | Contrast test of different permeability improvement technologies for gas-rich low-permeability coal seams | |
| CN112161538A (en) | Complex mining area environment control blasting method | |
| CN109163630A (en) | A kind of loading method of Caving Method with Large Space mining deep hole water pressure blasting explosion | |
| CN104819669B (en) | Medium-length hole blasting method | |
| CN103148748A (en) | Bearing pressure adjustable plastic expansion pipe deep hole blasting control method | |
| CN102967191A (en) | Blasting method for treatment of gob | |
| CN102288077A (en) | Water stemming bag and method for sealing coal mine blast hole by utilizing same | |
| CN107036498A (en) | A kind of ore body hydraulic pressure demolition system and ore body hydraulic pressure demolition method | |
| CN103868419A (en) | Smooth surface blasting construction method used in tunnel excavation process in hydraulic engineering | |
| CN114353608A (en) | Safe ore mining method | |
| CN110185412A (en) | Underground device for plugging | |
| CN108413826B (en) | Deep hole loosening blasting device and method | |
| CN107367207B (en) | Joint-cutting explosive package and axial uncoupled explosive-loading step deep hole smooth blasting device | |
| CN106225612A (en) | A kind of blast diode based on detonation wave corner-turning effect | |
| CN101799262B (en) | Smoothwall blasting method for digging tunnel | |
| CN108120355A (en) | The recognition methods that hole Blasting In Open-pit Mines pack miss-fires | |
| CN107560504A (en) | A kind of mining blasting cartridge for increasing safety in utilization | |
| CN114136798A (en) | Hydraulic pressure-blasting coupling fracturing model experiment system | |
| CN213392157U (en) | Construction structure for blasting high-order section drop shaft into well | |
| CN114322686A (en) | Detonating network structure and control method for safety blasting of underground excavation tunnel | |
| CN207816121U (en) | A kind of deep hole standing shot device | |
| CN206311013U (en) | A kind of ore body hydraulic pressure demolition system | |
| CN106150470A (en) | A kind of separate zone production method insulating salt deposit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |