CN107367207A - Segment algorithm is not with axially coupling joint powder charge step Deep-hole Smooth Blasting device - Google Patents
Segment algorithm is not with axially coupling joint powder charge step Deep-hole Smooth Blasting device Download PDFInfo
- Publication number
- CN107367207A CN107367207A CN201710725539.7A CN201710725539A CN107367207A CN 107367207 A CN107367207 A CN 107367207A CN 201710725539 A CN201710725539 A CN 201710725539A CN 107367207 A CN107367207 A CN 107367207A
- Authority
- CN
- China
- Prior art keywords
- powder charge
- hole
- blasting
- pallet
- standards section
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention relates to segment algorithm with axially not coupling joint powder charge step Deep-hole Smooth Blasting device,Including multiple powder charge pipe standards sections,It is linked in sequence between the mouth of pipe of powder charge pipe standards section and forms blasting cartridge,The junction of adjacent powder charge pipe standards section is provided with the pallet of bracketing explosive,One end of blasting cartridge is provided with base,The other end of blasting cartridge is provided with top cover,The through hole that primacord passes through is provided with the card of pallet,The through hole that the primacord is sequentially passed through the through hole on pallet by base and opened up by the top cover of blasting cartridge upwards is drawn,Crack is additionally provided with pallet,The device can improve the effective rate of utilization of explosive,Weaken influence of the rock mass complicated geological environment to powder charge,Prevent blasting fume from overflowing too early,Improve the blasting fume broken rock time,Improve safety and crushing effect,Controlled blasting hazard of vibration simultaneously,Construction is reduced with excavating cost.
Description
Technical field
The present invention relates to blast charging engineering device technique field, more particularly to segment algorithm is not with axially coupling joint chargeholder
Rank Deep-hole Smooth Blasting device.
Background technology
With the progress of drilling machine and the raising of excavating machinery earth and stone digging ability, bench blasting warp-wise deep hole light
Face explosion strides forward.Due to the uncertainty of the condition of geology, tomography is can be potentially encountered in step long-hole blasting pore forming process, is saved
The complicated geological structure such as reason, solution cavity, the emergency case for filling more and losing medicine during powder charge be present.In drilling, pore forming process
In can be potentially encountered underground water and rainwater weather, cause blasthole bottom to have ponding, but because hole depth is difficult to clean up, it is quick-fried to influence explosive
Broken effect and blasting quality, also easily cause potential safety hazard.The backwardness of charge constitution mode, field application pack processing mode master
Explosive is placed in plastic long tube, then insertion primacord is ignited in pipe, this charging means, is continuously filled in the pipe made
Medicine, cause blasthole unit consumption big, detonation first pressing is too high, and hole wall rock excessively crushes, and blasting vibration harm is big.
After segment algorithm blast, due to being limited by unilateral double-pipe, explosion energy preferentially discharges at joint-cutting, preferential right
Rock medium effect at joint-cutting produces crack, so as to reach control rock mass cracking direction, reduces the damage that need to retain rock mass, mesh
Segment algorithm as previous carries out joint-cutting processing using to hollow charge structure more, and machining accuracy is higher, and job site operation is relatively tired
It is difficult.
Axial Uncoincided charge be current step photoface exploision frequently with a kind of effective charge structure, reserved mattress
Layer reduces shock wave and detonation gas pressure, reduces its impact compress to hole wall rock and destroys, extends quick-fried in blasthole
The existence time of angry body, the lower smooth surface of rock blasting fracgmentation of detonation gas quasi static pressure effect is improved into the quality of seam.But mesh
Explosive and primacord generally are tied up to put by preceding scene does patent medicine string on bamboo chip, is then placed in drilling, is needed in implementation process
Several site operation personnels participate in colligation, and the powder charge time is grown, and bamboo chip and primacord kinking, operating process easily occurs in powder charge process
It is dangerous larger.
The content of the invention
It is an object of the invention to provide a kind of segment algorithm with axially not coupling joint powder charge step Deep-hole Smooth Blasting
Device, it is possible to increase the effective rate of utilization of explosive, weaken influence of the rock mass complicated geological environment to powder charge, prevent blasting fume mistake
It is early to overflow, safety and crushing effect, while controlled blasting hazard of vibration are improved, reduces construction with excavating cost.
To achieve the above object, the technical scheme of this bright use is：
For segment algorithm with axially not coupling joint powder charge step Deep-hole Smooth Blasting device, device includes multiple powder charge pipe marks
Standard saves, and is linked in sequence between the mouth of pipe of the powder charge pipe standards section and forms blasting cartridge, the junction of adjacent powder charge pipe standards section is set
The pallet of bracketing explosive is equipped with, one end of the blasting cartridge is provided with base, and the other end of the blasting cartridge is provided with top cover, institute
State and the through hole that primacord passes through is provided with the card of pallet, the primacord is sequentially passed through the through hole on pallet by base upwards
And the through hole opened up by the top cover of blasting cartridge is drawn, and crack is additionally provided with the pallet.
The also existing supplementary features of the present invention are：
Radial direction of the crack along pallet is arranged, opening, the opening are provided with the powder charge pipe standards section
Arranged along the length direction of powder charge pipe standards section.
Inverted U-shaped ring is provided with the base, the primacord is connected with inverted U-shaped ring.
It is connected through a screw thread and is integrated between the pipe end of the powder charge pipe standards section, the base and powder charge pipe standards section
It is connected through a screw thread and is integrated between pipe end.
The powder charge pipe standards section and inverted U-shaped ring are made up of antistatic plastic materials.
Antistatic plastic film is packaged with the opening.
Compared with prior art, the technique effect that possesses of the present invention is：The present invention is simple in construction, practical and convenient, reduces
Operator's number, improves loading rate, the advantages of fully combining Cutting Seam Cartridge Blasting and axially do not couple explosion, improves
Medicine section catalase degree is filled out, reduces the usage amount of explosive, decreases the injury to retaining rock mass, improve explosive has
Utilization rate is imitated, influence of the complicated geological environment to powder charge is reduced, prevents blasting fume from overflowing too early, improves safety and broken effect
Fruit, while blasting vibration harm is controlled, construction is reduced with excavating cost.
Brief description of the drawings
Fig. 1 is structural representation of the segment algorithm with not coupling joint powder charge step Deep-hole Smooth Blasting dress axially；
Fig. 2 is sectional view of the segment algorithm with not coupling joint powder charge step Deep-hole Smooth Blasting dress axially；
Fig. 3 is that segment algorithm cuts open with not coupling the powder charge pipe standards section in joint powder charge step Deep-hole Smooth Blasting dress axially
View；
Fig. 4 is that segment algorithm shows with not coupling the pallet end face structure in joint powder charge step Deep-hole Smooth Blasting dress axially
It is intended to；
Fig. 5 is structural representation of the segment algorithm with not coupling the base in joint powder charge step Deep-hole Smooth Blasting dress axially
Figure.
Embodiment
With reference to Fig. 1 to Fig. 5, the present invention is further described：
For segment algorithm with axially not coupling joint powder charge step Deep-hole Smooth Blasting device, device includes multiple powder charge pipe marks
Standard saves 30, is linked in sequence between the mouth of pipe of the powder charge pipe standards 30 and forms blasting cartridge, the connection of adjacent powder charge pipe standards section 30
Place is provided with the pallet 40 of bracketing explosive, and one end of the blasting cartridge is provided with base 50, and the other end of the blasting cartridge is set
Have top cover 80, be provided with the through hole 41 that primacord 60 passes through in the card of the pallet 40, the primacord 60 from base 50 to
On sequentially pass through through hole 41 on pallet 40 and the through hole that is opened up by the top cover 80 of blasting cartridge is drawn, also set on the pallet 40
It is equipped with crack 42；
With reference to shown in Fig. 1 and Fig. 2, the top cover 80 with holes is external with disposed thread and top powder charge pipe standards section 30
Threaded connection, the other end of primacord 60 leave enough through the through hole 41 of pallet 40 in all powder charge pipe standards sections 30
Residue length, the direction of segment algorithm is consistent with blasthole line direction before reservation rock mass, and blasthole carries out filling closure, is led described
Quick-fried rope 60 accesses blasting network, waits ignition to be excited；
Pallet 40 is provided between powder charge pipe standards section 30 at this, in the case where detonation fuse 60 is ignited, can be made
The top explosive of pallet 40 obtained in each knot powder charge pipe standards section 30 synchronously explodes, and crack 42 is set on pallet 40 so that fill
The state of air conducting is between pencil standard knot 30；
Different according to the degree of packing of design, the explosive payload in each powder charge pipe standards section 30 is different, same
In standard knot, due to powder charge section and air section be present, therefore in blast process, blast is instantaneous in each powder charge pipe standards section 30
Caused Energy distribution is different, and detonation gas pressure is not also same, and the destruction degree of injury to rock mass is also different, in the present invention,
Pass through the crack 42 on the pallet 40 between powder charge pipe standards section 30 so that in each powder charge pipe standards section 30 caused by blast
Gas pressure, can be within the extremely short time, and stepless action is excessively broken so as to reduce powder charge section rock mass in hole wall rock mass
It is broken；
The demolition set of this kind of structure can effectively reduce the shock wave of powder charge section and detonation gas pressure in hole, reduce
Its excess impact compression failure to hole wall rock, due to the effect of contraction of powder charge pipe standards section 30, is extended quick-fried in blasthole
The existence time of angry body, so as to effectively improve the capacity usage ratio of explosive charge.
As the preferred scheme of the present invention, with reference to shown in Fig. 4, radial direction of the crack 42 along pallet 40 is arranged,
Opening 31 is provided with the powder charge pipe standards section 30, length direction of the opening 31 along powder charge pipe standards section 30 is arranged；
The width in the crack 42 at this is smaller in itself, and to prevent blasting explosive granules from dropping, the design in the crack 42 is also convenient for
Air flow, after explosive initiation, energy priority caused by explosive charge is provided with opening from the powder charge pipe standards section 30
31 releases, therefore the explosive charge produces the hole wall rock mass that energy priority is acted at opening 31 so that hole wall rock mass, which produce, to be split
Seam, because powder charge pipe standards section 30 is to the effect of contraction of explosion energy, can effectively reduce the opening of powder charge pipe standards section 30 31 with
The impact compress of outer hole wall rock is destroyed, so as to improve the demolition effect of light surface layer.
Further, inverted U-shaped ring 51 is provided with the base 50, the primacord 60 is connected with inverted U-shaped ring 51, described
Be connected through a screw thread and be integrated between the pipe end of powder charge pipe standards section 30, the pipe end of the base 50 and powder charge pipe standards section 30 it
Between be connected through a screw thread and be integrated；
Base 50 can be arranged to external screw thread, the pipe end of powder charge pipe standards section 30 is arranged to internal thread, so as to facilitate bottom
Installation between seat 50 and the pipe end of powder charge pipe standards section 30, has some strength and waterproof and above-mentioned primacord 60
It is connected with the inverted U-shaped ring 51 on base 50, so as to realize the fixation to primacord 60.
The powder charge pipe standards section 30 and inverted U-shaped ring 51 are made up of antistatic plastic materials；The caliber of powder charge pipe standards section 30
It is slightly less than the diameter of blasthole, general length is 1-2 rice, is easy to machine-shaping and transport.
Antistatic plastic film is packaged with the opening 31；On the one hand prevent explosive from spilling, on the other hand prevent blasthole
In there is water to enter powder charge pipe standards section 30, influence demolition effect, intensity is lower than the material of powder charge pipe standards section.
The segment algorithm and the operating method for not coupling joint powder charge step Deep-hole Smooth Blasting device axially, including it is following
Step：
1), the metal protection head of primacord 60 is cut, penetrated from the top of powder charge pipe standards section 30, passes through the logical of pallet 40
Tightened together with the bind of inverted U-shaped ring 51 of base 50, by base 50 with the bottom of powder charge pipe standards section 30 by screw thread in hole 41.
2) powder charge, is carried out using explosive charge according to what the blasthole linear charging density of step Deep-hole Smooth Blasting design determined,
Load from the top of powder charge pipe standards section 30 that primacord 60 passes by explosive in powder charge pipe standards section 30, reach the medicine of traditional thread binding design
Amount.Powder charge pipe standards section 30 is put into blasthole, the primacord 60 is continued to penetrate from another bottom of powder charge pipe standards section 30, is led to
The through hole 41 of pallet 40 is crossed, passes powder charge pipe standards section 30, the powder charge pipe standards section 30 is closely connected by screw thread, according to big gun
Hole line density continues powder charge, splices successively, is put into blasthole, until being loaded into powder charge design height.
3) primacord 30, is passed through into top cover 80 with holes, top cover 80 with holes is closely connected with powder charge pipe standards section 30 by screw thread
Connect, form an intact device, be put into blasthole, primacord 60 leaves enough residue lengths, the direction of segment algorithm and reservation
Blasthole line direction is consistent before rock mass, and blasthole carries out filling closure, and the primacord 60 is accessed into blasting network, waits to be excited draw
It is quick-fried.
The present invention is simple in construction, practical and convenient, reduces operator's number, improves loading rate, fully combine
The advantages of Cutting Seam Cartridge Blasting and axial direction do not couple explosion, medicine section catalase degree is filled out in improvement, reduces the usage amount of explosive,
The injury to retaining rock mass is decreased, the effective rate of utilization of explosive is improved, reduces shadow of the complicated geological environment to powder charge
Ring, prevent blasting fume from overflowing too early, improve safety and crushing effect, while control blasting vibration harm, reduce construction
With excavating cost.
It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations, although ginseng
The present invention is described in detail according to previous embodiment, it will be understood by those within the art that：It still can be with
Technical scheme described in foregoing embodiments is modified, or equivalent substitution is carried out to which part technical characteristic, and
These modifications are replaced, and the essence of appropriate technical solution is departed from the spirit and model of various embodiments of the present invention technical scheme
Enclose.
Claims (6)
1. segment algorithm is not with axially coupling joint powder charge step Deep-hole Smooth Blasting device, it is characterised in that：Device includes more
Individual powder charge pipe standards section (30), it is linked in sequence between the mouth of pipe of the powder charge pipe standards section (30) and forms blasting cartridge, adjacent powder charge
The junction of pipe standards section (30) is provided with the pallet (40) of bracketing explosive, and one end of the blasting cartridge is provided with base (50),
The other end of the blasting cartridge is provided with top cover (80), and be provided with that primacord (60) passes through in the card of the pallet (40) is logical
Hole (41), the primacord (60) sequentially pass through through hole (41) on pallet (40) and by blasting cartridge upwards by base (50)
The through hole that top cover (80) opens up is drawn, and crack (42) is additionally provided with the pallet (40).
2. segment algorithm according to claim 1 does not couple joint powder charge step Deep-hole Smooth Blasting device with axial direction, its
It is characterised by：Radial direction of the crack (42) along pallet (40) is arranged, is provided with the powder charge pipe standards section (30)
It is open (31), length direction arrangement of the opening (31) along powder charge pipe standards section (30).
3. segment algorithm according to claim 2 does not couple joint powder charge step Deep-hole Smooth Blasting device with axial direction, its
It is characterised by：Inverted U-shaped ring (51) is provided with the base (50), the primacord (60) is connected with inverted U-shaped ring (51).
4. segment algorithm according to claim 3 does not couple joint powder charge step Deep-hole Smooth Blasting device with axial direction, its
It is characterised by：It is connected through a screw thread and is integrated between the pipe end of the powder charge pipe standards section (30), the base (50) and powder charge
It is connected through a screw thread and is integrated between the pipe end of pipe standards section (30).
5. segment algorithm according to claim 3 does not couple joint powder charge step Deep-hole Smooth Blasting device with axial direction, its
It is characterised by：The powder charge pipe standards section (30) and inverted U-shaped ring (51) are made up of antistatic plastic materials.
6. segment algorithm according to claim 2 does not couple joint powder charge step Deep-hole Smooth Blasting device with axial direction, its
It is characterised by：Antistatic plastic film is packaged with the opening (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710725539.7A CN107367207B (en) | 2017-08-22 | 2017-08-22 | Joint-cutting explosive package and axial uncoupled explosive-loading step deep hole smooth blasting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710725539.7A CN107367207B (en) | 2017-08-22 | 2017-08-22 | Joint-cutting explosive package and axial uncoupled explosive-loading step deep hole smooth blasting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107367207A true CN107367207A (en) | 2017-11-21 |
| CN107367207B CN107367207B (en) | 2023-04-25 |
Family
ID=60311349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710725539.7A Active CN107367207B (en) | 2017-08-22 | 2017-08-22 | Joint-cutting explosive package and axial uncoupled explosive-loading step deep hole smooth blasting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107367207B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520384A (en) * | 2018-12-28 | 2019-03-26 | 钦州学院 | Based on the axial underwater Cutting Seam Cartridge Blasting device not coupled and its construction method |
| CN111023928A (en) * | 2019-12-10 | 2020-04-17 | 北京科技大学 | Method for improving ore dropping efficiency without bottom pillar |
| CN115218733A (en) * | 2022-06-02 | 2022-10-21 | 青岛理工大学 | Deep hole blasting device and using method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202274827U (en) * | 2011-07-05 | 2012-06-13 | 中铁隧道集团有限公司 | Brine coupling kerf pipe loading structure applied to smooth blasting |
| KR101384820B1 (en) * | 2013-12-24 | 2014-04-15 | 이진성 | Tube charged of explosives powder with air gap and method of constructing method for blasting bedrock using that |
| CN204718510U (en) * | 2015-05-27 | 2015-10-21 | 中交一公局厦门工程有限公司 | A kind of novel joint-cutting quick-burning charge monoblock type photoface exploision device |
| CN207095430U (en) * | 2017-08-22 | 2018-03-13 | 安徽理工大学 | Segment algorithm is not with axially coupling joint powder charge step Deep-hole Smooth Blasting device |
-
2017
- 2017-08-22 CN CN201710725539.7A patent/CN107367207B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202274827U (en) * | 2011-07-05 | 2012-06-13 | 中铁隧道集团有限公司 | Brine coupling kerf pipe loading structure applied to smooth blasting |
| KR101384820B1 (en) * | 2013-12-24 | 2014-04-15 | 이진성 | Tube charged of explosives powder with air gap and method of constructing method for blasting bedrock using that |
| CN204718510U (en) * | 2015-05-27 | 2015-10-21 | 中交一公局厦门工程有限公司 | A kind of novel joint-cutting quick-burning charge monoblock type photoface exploision device |
| CN207095430U (en) * | 2017-08-22 | 2018-03-13 | 安徽理工大学 | Segment algorithm is not with axially coupling joint powder charge step Deep-hole Smooth Blasting device |
Non-Patent Citations (1)
| Title |
|---|
| 李显寅;冯德润;: "切缝药包爆破技术在露天边坡开挖中的应用" * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520384A (en) * | 2018-12-28 | 2019-03-26 | 钦州学院 | Based on the axial underwater Cutting Seam Cartridge Blasting device not coupled and its construction method |
| CN109520384B (en) * | 2018-12-28 | 2024-02-06 | 北部湾大学 | Underwater lancing explosive package blasting device based on axial uncoupling and construction method thereof |
| CN111023928A (en) * | 2019-12-10 | 2020-04-17 | 北京科技大学 | Method for improving ore dropping efficiency without bottom pillar |
| CN115218733A (en) * | 2022-06-02 | 2022-10-21 | 青岛理工大学 | Deep hole blasting device and using method thereof |
| CN115218733B (en) * | 2022-06-02 | 2023-08-11 | 青岛理工大学 | Deep hole blasting device and application method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107367207B (en) | 2023-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105874299B (en) | It is provided with the charge tube of air gap and the rock blasting construction method using this charge tube | |
| CN107355229B (en) | The construction method of deep hole smooth surface Tunnel Blasting system and the tunnel | |
| CN103148748B (en) | Bearing pressure adjustable plastic expansion pipe deep hole blasting control method | |
| CN106197178B (en) | A kind of new deep hole water pressure blasting demolition set and blasting method | |
| CN106225617B (en) | A kind of rock-burst prevention method based on quick-fried rammer hydrofracturing | |
| CN106437709A (en) | Solid carbon dioxide fracturing device and method | |
| CN107367207A (en) | Segment algorithm is not with axially coupling joint powder charge step Deep-hole Smooth Blasting device | |
| CN107152303A (en) | A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane | |
| CN107339920B (en) | The method of superdeep holes presplit blasting | |
| CN102155890A (en) | Filling method used in deep hole loosening blasting pressure release | |
| CN107957222A (en) | Reduce blasthole spaced loading and the method for ignition of methods of blasting toes in open generation rate | |
| CN207095430U (en) | Segment algorithm is not with axially coupling joint powder charge step Deep-hole Smooth Blasting device | |
| CN109870084A (en) | A kind of VCR mining codes exempt from cleaning bottom of hole blast charging structure and its construction method | |
| CN114279286A (en) | Multistage filling blasting dust-settling method for open-air iron ore | |
| CN107288606A (en) | A kind of method of artificial construction hot dry rock heat reservori | |
| CN112857156B (en) | Environment-friendly dust suppression blasting method for surface mine and water hole charging blasting method | |
| CN201159620Y (en) | Deep borehole blasting cartridge | |
| CN103591860A (en) | Water coupling gunpowder filling and ignition method for improving small-particle-size material content of rock-fill dam transition material | |
| US5689085A (en) | Explosive displacing bore hole tube | |
| RU2242600C1 (en) | Gas generator on solid fuel for well | |
| CN108801086A (en) | Deep hole loosens stress pre-released hydraulically blasting method and device | |
| CN108469209A (en) | A kind of bathroclase crack tunnel smooth surface sinking and blasting method | |
| CN101270634B (en) | Down-hole wall-fixing method | |
| CN207113738U (en) | Suitable for the superdeep holes presplit blasting charge system by side and section step | |
| CN110823036A (en) | Blasting method for controlling damage of edge rock mass of blasting area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |