CN105386766A - Reinforcement presplitting support method for extremely fractured hanging side roof mined by shallow hole ore leaving method - Google Patents
Reinforcement presplitting support method for extremely fractured hanging side roof mined by shallow hole ore leaving method Download PDFInfo
- Publication number
- CN105386766A CN105386766A CN201511025411.7A CN201511025411A CN105386766A CN 105386766 A CN105386766 A CN 105386766A CN 201511025411 A CN201511025411 A CN 201511025411A CN 105386766 A CN105386766 A CN 105386766A
- Authority
- CN
- China
- Prior art keywords
- top board
- presplitting
- upper dish
- reinforcement
- stope
- 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
- 238000000034 method Methods 0.000 title claims abstract description 59
- 230000002787 reinforcement Effects 0.000 title claims abstract description 19
- 238000005422 blasting Methods 0.000 claims abstract description 42
- 239000011435 rock Substances 0.000 claims abstract description 19
- 238000005065 mining Methods 0.000 claims abstract description 15
- 239000012895 dilution Substances 0.000 claims abstract description 6
- 238000010790 dilution Methods 0.000 claims abstract description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 27
- 238000005553 drilling Methods 0.000 claims description 11
- 239000002360 explosive Substances 0.000 claims description 10
- 230000000717 retained effect Effects 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 210000003462 vein Anatomy 0.000 abstract description 3
- 239000003721 gunpowder Substances 0.000 abstract 4
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000009514 concussion Effects 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention relates to a reinforcement presplitting support method for an extremely fractured hanging side roof mined by a shallow hole ore leaving method, and aims to provide a maintenance method of the extremely fractured hanging side roof mined by an ore leaving method from a high-dipping thin vein to a middle-thickness ore body. Multi-fanshaped-deep-hole non-coupled or non-coupled spaced gunpowder charging of a hanging side ore rock interface is used for presplitting blasting and preventing the hanging side roof from being further damaged due to blasting shake in a mining process; hanging side roof surrounding rock except a presplitting blasting surface is reinforced by means of rebars with bundled gunpowder rollers in the deep-hole non-coupled or non-coupled spaced gunpowder charging, and by means of the shallow hole ore leaving method, anchor rods and strip-net combined support bodies in the mining process support the hanging side roof with a gradually exposed stope and left rebars in fan-shaped distribution, thus together forming a supporting protection net of the hanging side roof, accordingly avoiding the condition that the hanging side roof is collapsed and a dilution rate is increased, and also preventing the stope from being scrapped due to the collapse of the hanging side roof. The reinforcement presplitting support method is an integrated innovation of presplitting blasting, deep-hole non-coupled or non-coupled spaced gunpowder charging and anchor rod and strip-net supporting.
Description
Technical field
The invention belongs to mining technique field, relate to the presplit blasting shock-dampening method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation, also the advanced reinforcement supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation is related to, particularly the reinforcement presplitting supporting method of extremely broken upper dish top board exploited of a kind of shallow hole shrinkage method.
Background technology
When exploiting the extremely broken steeply inclined thin arteries and veins of upper dish top board to middle thickness orebody, the normal top board that occurs collapses and causes the rate of dilution sharply to increase, and even causes stope to be scrapped.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the reinforcement presplitting supporting method of the extremely broken upper dish top board that the object of the present invention is to provide a kind of shallow hole shrinkage method to exploit, can the rate of dilution be reduced, avoid stope to scrap because of upper dish roof caving, guarantee safety, the economic exploitation.
To achieve these goals, the technical solution used in the present invention is:
The reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation, it is characterized in that, in deep hole 4 presplit blasting of Shang Pankuang rock interface thus when avoiding mining process borehole blasting to shake damaging further coiling top board, implement deep hole with binding adhesive tape 11 reinforcing bar 7 be bundled in by explosive cartridge 10 slightly larger than deep hole 4 length not to be coupled or not to be coupled spaced loading presplit blasting, after presplit blasting, reinforcing bar 7 is retained in deep hole 4, forms advance support body stope 9 coiling the fan-shaped distribution of top board.
Shrinkage mining undercut and fall at every turn ore deposit rock drilling time, stope 9 move towards total length across strike in row's mounting bar net 6 and anchor pole 5 combined supporting mining process in the reinforcing bar 7 of fan-shaped distribution of the upper dish top board (top board also namely beyond presplit blasting face) that progressively exposes of stope 9 and indwelling, thus the reinforcing bar 7 be retained in deep hole 4 forms common carrying prop stope 9 coiling top board when bar net 6 and anchor pole 5 combined supporting body and presplit blasting, guarantee extremely broken stope 9 coils top board in the not inbreak in ore deposit and ore drawing process that falls, thus avoid stope 9 coiling top board and collapse and increase the rate of dilution, also stope 9 is avoided to scrap because upper dish top board collapses.
Fan-shaped presplitting deep hole 4 arranges that number is determined according to roof stability and Pre-splitting Blasting Effect, the total dose of spaced loading of not being coupled or not being coupled in more, the single deep holes 4 of fan-shaped deep hole 4 number arranged when general top board is more broken is fewer, thus under the prerequisite guaranteeing Pre-splitting Blasting Effect, so that the reinforcing bar 7 of indwelling in more broken top board is more intensive.
Go up a hill from every bar and 1 enter through connecting taxiway 2 number of fan-shaped deep hole 4 that drilling chamber 3 constructs and be generally 15 ~ 27.Array pitch along the supporting of top board incline direction bar net 6 is determined according to the concrete steadiness of top board, and general array pitch is 1.5 ~ 3.0m.The spacing of anchor pole 5 supporting is determined according to the concrete steadiness of top board, and general spacing is 1.0 ~ 2.0m.Bar net 6 is general with 2
round bar spacing 110mm, and form with discarded steel bar end or the 800 ~ 1000mm spot welding of handle iron interval, its length determine according to the convenience of transport, generally grows 2 ~ 3m.Reinforcing bar (7) specification is
Compared with prior art, the invention has the beneficial effects as follows:
1) deep hole 4 large area presplit blasting, the concussion of blasting cut off in shrinkage method mining process coils the propagation in roof rock on stope 9, and this technique yet there are no employing in mining process.
2) the spaced loading structure that is not coupled or is not coupled that the detonating fuse 8 length bundled slightly larger than the reinforcing bar 7 of deep hole 4 degree of depth, explosive 10 are made loads in deep hole 4 one by one, after the presplit blasting of great Qu elementary errors, indwelling reinforcing bar 7 is as the reinforcement prop of the upper dish roof rock beyond presplit blasting face.
3) jointly form by the reinforcing bar 7 of indwelling in the anchor pole 5 of immediate support in the ore deposit rock drilling process that undercuts, falls, bar net 6 combined supporting body and presplit blasting at every turn supporting protection net stope 9 coiling top board.
Accompanying drawing explanation
Fig. 1 is principle of the invention schematic diagram.
Detailed description of the invention
Embodiments of the present invention are described in detail below in conjunction with drawings and Examples.
As shown in Figure 1, the invention provides the reinforcement presplitting supporting method of the extremely broken upper dish top board that a kind of steeply inclined thin arteries and veins to middle thickness orebody shallow hole shrinkage method is exploited.Not to be coupled or not to be coupled spaced loading presplit blasting by the deep hole 4 of the multiple fan-shaped layout in rock interface place, upper dish ore deposit, cut off mining process borehole blasting vibrations to the further concussion of blasting damage of stope 9 coiling top board, and be not coupled by deep hole or bundle explosive cartridge 10 in the spaced loading that is not coupled reinforcing bar 7 reinforcement presplit blasting face beyond upper dish roof rock, and in conjunction with the anchor pole 5 in shallow hole shrinkage method mining process, bar net 6 combined supporting body is the reinforcing bar 7 of indwelling in the upper dish top board that exposes of supporting stope 9 and presplit blasting progressively, anchor pole 5, the reinforcing bar 7 of bar net 6 combined supporting body and indwelling forms supporting protection net stope 9 coiling top board jointly, thus avoid stope 9 coiling top board and collapse and increase the rate of dilution, also stope 9 is avoided to scrap because upper dish top board collapses.
Concrete steps of the present invention comprise:
Go up a hill or way shaft 1 the vertical ore body in middle part on stope 9 dish level driving connecting taxiway 2.After connecting taxiway 2 arrives rock line of demarcation, ore deposit, connecting taxiway 2 is expanded into drilling chamber 3.Fan-shaped deep hole 4 is cut a hole by Fig. 1 along ore deposit rock interface in drilling chamber 3.Deep hole 4 depth capacity can reach 35m.
After the whole rock drilling of fan-shaped deep hole 4, explosive cartridge 10 made by detonating fuse 8, the explosive 9 of binding on the reinforcing bar 7 of length slightly larger than deep hole 4 degree of depth, the spaced loading structure that is not coupled or is not coupled is coordinated to load in deep hole 4 one by one, when the general fan-shaped deep hole degree of depth is more than 20 ~ 25m, reinforcing bar 7 bundlees 2 explosive cartridges 10 with binding adhesive tape 11 simultaneously and makes the continuous charging structure that is not coupled; The general fan-shaped deep hole degree of depth, when 10 ~ 15m to 20 ~ 25m, reinforcing bar 7 bundlees 1 explosive cartridge 10 and makes the continuous charging structure that is not coupled; Within the 10 ~ 15m of aperture, reinforcing bar 7 bundlees 1 explosive cartridge 10 and makes the spaced loading structure that is not coupled; Aperture 3 ~ 5m does not generally bundle explosive cartridge 10 on reinforcing bar 7.
Before shallow hole shrinkage method exploitation undercuts, first go up a hill or way shaft 1 middle part horizontal arrangement drilling chamber 3 in along on coil the presplit blasting of ore deposit rock interface fan-shaped deep hole 4, thus avoid mining process borehole blasting to shake damaging further coiling top board.
During presplit blasting powder charge, adopt great Qu short-delay blasting, the ore deposit rock interface of dish on the whole stope 9 of disposable presplit blasting.
After presplit blasting completes, stope 9 undercuts, fall ore deposit in beginning, and the reinforcing bar 7 of the indwelling in the upper dish roof rock that progressively exposes of anchor pole 5, bar net 6 combined supporting stope 9 and presplit blasting in time undercuting at every turn, in the ore deposit rock drilling process that falls, the reinforcing bar 7 of anchor pole 5, bar net 6 combined supporting body and indwelling forms supporting protection net stope 9 coiling top board jointly.
After presplit blasting, reinforcing bar 7 is retained in each fan-shaped deep hole 4, the upper dish top board formed beyond presplit blasting face also namely dig up mine 9 the advance support body of fan-shaped distribution of upper dish top board.Shrinkage mining undercut and fall at every turn ore deposit rock drilling time, move towards total length along stope in time and coil on row's mounting bar net 6 and anchor pole 5 combined supporting stope 9 top board progressively exposed, thus the reinforcing bar 7 be retained in each fan-shaped deep hole 4 forms carrying prop stope 9 coiling top board jointly when bar net 6 and anchor pole 5 combined supporting body and presplit blasting, guarantee that the upper dish top board of the extremely broken stope 9 do not destroyed by concussion of blasting is in the not inbreak in ore deposit and ore drawing process that falls.
Claims (8)
1. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation, it is characterized in that, in deep hole (4) presplit blasting of Shang Pankuang rock interface thus when avoiding mining process borehole blasting to shake damaging further upper dish top board, implement deep hole with binding adhesive tape (11) reinforcing bar (7) be bundled in by explosive cartridge (10) slightly larger than deep hole (4) length not to be coupled or not to be coupled spaced loading presplit blasting, after presplit blasting, reinforcing bar (7) is retained in deep hole (4), form the advance support body of the fan-shaped distribution of stope (9) upper dish top board.
2. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation according to claim 1, it is characterized in that, shrinkage mining undercut and fall at every turn ore deposit rock drilling time, total length across strike is moved towards in arranging the upper dish top board that in mounting bar net (6) and anchor pole (5) combined supporting mining process, stope (9) progressively exposes at stope (9), namely the top board beyond presplit blasting face, and the reinforcing bar (7) of the fan-shaped distribution of indwelling, when the combined supporting body that bar net (6) and anchor pole (5) are formed and presplit blasting, the reinforcing bar (7) be retained in deep hole (4) forms the upper common carrying prop coiling top board of stope (9), guarantee that extremely broken stope (9) upper dish top board is in the not inbreak in ore deposit and ore drawing process that falls, thus avoid stope (9) upper dish top board collapse and increase the rate of dilution, also stope (9) is avoided to scrap because upper dish top board collapses.
3. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation according to claim 2, it is characterized in that, the array pitch along net (6) supporting of top board incline direction bar is 1.5 ~ 3.0m.
4. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation according to claim 2, it is characterized in that, the spacing of anchor pole (5) supporting is 1.0 ~ 2.0m.
5. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation according to claim 2, it is characterized in that, bar net (6) is with 2
round bar spacing 110mm, and form with discarded steel bar end or the 800 ~ 1000mm spot welding of handle iron interval, its length is 2 ~ 3m.
6. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation according to claim 1, it is characterized in that, fan-shaped presplitting deep hole (4) arranges that number is determined according to roof stability and Pre-splitting Blasting Effect, the total dose of spaced loading of not being coupled or not being coupled in more, the single deep holes of fan-shaped deep hole (4) number (4) arranged when top board is more broken is fewer, thus under the prerequisite guaranteeing Pre-splitting Blasting Effect, so that the reinforcing bar of indwelling in more broken top board (7) is more intensive.
7. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation according to claim 1, it is characterized in that, be 15 ~ 27 from every bar number that (1) enter through connecting taxiway (2) the fan-shaped deep hole (4) that drilling chamber (3) is constructed of going up a hill.
8. the reinforcement presplitting supporting method of the extremely broken upper dish top board of shallow hole shrinkage method exploitation according to claim 1, it is characterized in that, described reinforcing bar (7) specification is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511025411.7A CN105386766B (en) | 2015-12-31 | 2015-12-31 | The reinforcement presplitting method for protecting support of the extremely broken upper disk top plate of shallow hole shrinkage method exploitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511025411.7A CN105386766B (en) | 2015-12-31 | 2015-12-31 | The reinforcement presplitting method for protecting support of the extremely broken upper disk top plate of shallow hole shrinkage method exploitation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105386766A true CN105386766A (en) | 2016-03-09 |
| CN105386766B CN105386766B (en) | 2017-09-05 |
Family
ID=55419464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511025411.7A Active CN105386766B (en) | 2015-12-31 | 2015-12-31 | The reinforcement presplitting method for protecting support of the extremely broken upper disk top plate of shallow hole shrinkage method exploitation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105386766B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109630119A (en) * | 2018-11-16 | 2019-04-16 | 西北矿冶研究院 | Anti-collapse supporting method for ultra-broken thin ore shallow hole shrinkage stope |
| CN110173247A (en) * | 2019-05-19 | 2019-08-27 | 中铁十九局集团矿业投资有限公司 | A kind of Roof Control fracturing process of soft broken top plate ore body back production |
| CN110905509A (en) * | 2019-11-07 | 2020-03-24 | 河南金源黄金矿业有限责任公司 | Deep hole shrinkage mining method for thin-vein type steeply inclined ore body |
| CN112502705A (en) * | 2020-11-10 | 2021-03-16 | 西北矿冶研究院 | Anti-collapse supporting method for ultra-broken thin ore shallow hole shrinkage stope |
| CN112780277A (en) * | 2020-12-30 | 2021-05-11 | 六盘水师范学院 | Coal seam floor fault water damage reinforcement prevention and control method |
| CN113586109A (en) * | 2021-07-09 | 2021-11-02 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Hanging wall rock mass supporting method for underground mining ore body of metal mine |
| CN114856563A (en) * | 2022-06-02 | 2022-08-05 | 紫金矿业集团股份有限公司 | Dead-weight ore-falling mining method for deep-hole pre-cracked ore in downward stage of broken ore rock |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1661422A1 (en) * | 1989-07-05 | 1991-07-07 | В.Л.Дюков и А.П.Волков | Method for working inclined ore obstructions |
| RU2234673C1 (en) * | 2003-03-17 | 2004-08-20 | Институт горного дела Дальневосточного отделения РАН | Method of explosion of ascending wells |
| CN103089267A (en) * | 2013-01-22 | 2013-05-08 | 鞍钢集团矿业公司 | Thin-ore-body shallow hole shrinkage method without sill pillar |
-
2015
- 2015-12-31 CN CN201511025411.7A patent/CN105386766B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1661422A1 (en) * | 1989-07-05 | 1991-07-07 | В.Л.Дюков и А.П.Волков | Method for working inclined ore obstructions |
| RU2234673C1 (en) * | 2003-03-17 | 2004-08-20 | Институт горного дела Дальневосточного отделения РАН | Method of explosion of ascending wells |
| CN103089267A (en) * | 2013-01-22 | 2013-05-08 | 鞍钢集团矿业公司 | Thin-ore-body shallow hole shrinkage method without sill pillar |
Non-Patent Citations (2)
| Title |
|---|
| 周玉斌等: "联合支护法在灵山金矿27#脉开采中的应用", 《矿业工程》 * |
| 胡伟平等: "复杂金矿床控制爆破技术探讨", 《黄金》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109630119A (en) * | 2018-11-16 | 2019-04-16 | 西北矿冶研究院 | Anti-collapse supporting method for ultra-broken thin ore shallow hole shrinkage stope |
| CN110173247A (en) * | 2019-05-19 | 2019-08-27 | 中铁十九局集团矿业投资有限公司 | A kind of Roof Control fracturing process of soft broken top plate ore body back production |
| CN110905509A (en) * | 2019-11-07 | 2020-03-24 | 河南金源黄金矿业有限责任公司 | Deep hole shrinkage mining method for thin-vein type steeply inclined ore body |
| CN112502705A (en) * | 2020-11-10 | 2021-03-16 | 西北矿冶研究院 | Anti-collapse supporting method for ultra-broken thin ore shallow hole shrinkage stope |
| CN112780277A (en) * | 2020-12-30 | 2021-05-11 | 六盘水师范学院 | Coal seam floor fault water damage reinforcement prevention and control method |
| CN112780277B (en) * | 2020-12-30 | 2023-01-24 | 六盘水师范学院 | Coal seam floor fault water damage reinforcement prevention and control method |
| CN113586109A (en) * | 2021-07-09 | 2021-11-02 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Hanging wall rock mass supporting method for underground mining ore body of metal mine |
| CN114856563A (en) * | 2022-06-02 | 2022-08-05 | 紫金矿业集团股份有限公司 | Dead-weight ore-falling mining method for deep-hole pre-cracked ore in downward stage of broken ore rock |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105386766B (en) | 2017-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105386766A (en) | Reinforcement presplitting support method for extremely fractured hanging side roof mined by shallow hole ore leaving method | |
| CN110145326B (en) | Surrounding rock stability control method suitable for coal mining area main roadway | |
| CN110952982B (en) | Medium-length hole presplitting blasting mining method for steeply inclined thin-vein to extremely thin-vein ore body | |
| CN102778182A (en) | Beside-roadway escribing pressure relief method of roadway driving along gob of small coal pillar influenced by dynamic pressure | |
| CN102182461A (en) | Efficient mining method for thick metal ore body in slanting | |
| CN102635356A (en) | Medium-length hole mining method in multiple blasting free faces of high dipping thin veins | |
| CN102808622A (en) | Method for recovering ore pillar by medium-length hole and deep hole combined blasting technology | |
| CN112161534B (en) | One-step mining control blasting method for mine underground upward access | |
| CN110331978A (en) | A kind of environment reconstruction segmentation medium-length hole afterwards filling mining method | |
| CN109870084B (en) | VCR mining method hole-sweeping-free blasting charge structure and construction method thereof | |
| CN113236246B (en) | Method for deep hole extrusion blasting slot pulling in underground mine | |
| CN108361032B (en) | It is horizontal to tilting route slotting formula mining codes of the very thin arteries and veins to thin lode body | |
| CN106247876A (en) | High working face cuts greatly a blasting method for fully-mechanized mining working tight roof overhead caving | |
| CN101539020A (en) | Upward layered mining method | |
| CN111022051B (en) | Forced caving method for central hard top plate of working face | |
| CN101893415A (en) | Blasting method by arch roof control and smooth-surface pillar control | |
| CN105387775A (en) | Method and device for treating crossing fault of fully mechanized mining work face | |
| CN110219650A (en) | A kind of environment remodeling stage deep hole afterwards filling mining method | |
| CN104790950B (en) | Optimized mining middle-deep blasthole millisecond blasting slot cutting method | |
| CN110685691B (en) | Forced roof caving method for hard roof | |
| CN110823034A (en) | Soft rock foundation blasting method capable of controlling mass percentage after blasting | |
| CN116378662A (en) | Supporting bracket placement method and irregular corner coal area mining method | |
| CN103175450B (en) | Deep hole blasting method | |
| CN219197326U (en) | Rock mass suspended ceiling medium-length hole bottom pulling structure | |
| CN113124722B (en) | Low-position sector cut blasting method for presplitting forming slot cavity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180315 Address after: 471400 Xidian village, old county town, Songxian, Luoyang, Henan Patentee after: Songxian Qian River Mining Co., Ltd. Address before: 710055 Shaanxi province Xi'an Yanta Road No. 13 Patentee before: Xi'an Architectural Sci & Tech. Univ. |