CN110360906B - Structure and method for reducing surface vibration in elevator shaft area to be blasted - Google Patents
Structure and method for reducing surface vibration in elevator shaft area to be blasted Download PDFInfo
- Publication number
- CN110360906B CN110360906B CN201910688173.XA CN201910688173A CN110360906B CN 110360906 B CN110360906 B CN 110360906B CN 201910688173 A CN201910688173 A CN 201910688173A CN 110360906 B CN110360906 B CN 110360906B
- Authority
- CN
- China
- Prior art keywords
- area
- blasting
- blasted
- detonators
- excavating
- 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
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005422 blasting Methods 0.000 claims abstract description 125
- 238000009412 basement excavation Methods 0.000 claims abstract description 36
- 239000002360 explosive Substances 0.000 claims abstract description 27
- 239000011435 rock Substances 0.000 claims description 30
- 239000000945 filler Substances 0.000 claims description 8
- 238000005474 detonation Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/005—Lift shafts
-
- 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
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a structure and a method for reducing the vibration of the ground, wherein the structure comprises an area to be blasted, the area to be blasted comprises an excavating area for mechanical excavation and a plurality of blasting areas for blasting, which are sequentially arranged in a straight line, at least two rows of blast hole groups are respectively arranged on each blasting area, each row of blast hole groups at least comprises one blast hole, explosive and detonators for detonating the explosive are arranged in each blast hole, the number of sections of the detonators in each blast hole is different, and the number of sections of the detonators in the blast holes, which are close to the excavating area, on the blasting area is smaller than the number of sections of the detonators in the blast holes, which are far away from the excavating area. The excavating area adopts mechanical excavation, provides a temporary surface for blasting of the blasting area closest to the excavating area, and is beneficial to reducing vibration generated during blasting of the blasting area.
Description
Technical Field
The invention relates to the field of building construction, in particular to a structure and a method for reducing the vibration of the ground surface in an elevator shaft area to be blasted.
Background
With the continuous expansion of urban population, the occupied area of urban people-average land is continuously reduced, and high-rise buildings are the main method for people to deal with the living problems of people after the expansion of urban population. However, according to the national regulations, new residential buildings of 4 floors and more or new residential buildings of more than 4 floors or new residential buildings of more than 9 meters in height from the outdoor design floor should be provided with elevators and should be installed at every floor where the door and the public corridor are provided.
Since elevators are necessary vehicles for urban high-rise houses, problems that may be encountered in elevator shaft construction have to be considered. Since the elevator shaft is generally excavated deeply downwards, when hard rocks are encountered, a blasting construction method is needed, however, the surrounding environment in the urban building is complex, a plurality of buildings exist, and the nearby buildings can be damaged by vibration caused by blasting, so that the earth surface vibration caused by blasting is a very critical safety link. In summary, the blasting structure and method adopted in the current elevator shaft blasting engineering cannot well reduce the earth surface vibration caused by blasting.
In view of this, the present inventors have conducted intensive studies on the above problems, and have produced the present invention.
Disclosure of Invention
The invention aims to provide a structure and a method for blasting an elevator shaft, which can effectively reduce earth surface vibration.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a reduce elevator shaft of earth's surface vibrations and wait to explode structure in district, is including waiting to explode the district, wait to explode the district and be used for including being the sharp excavation region that is arranged in proper order and a plurality of blasting regions that are used for blasting, each be equipped with at least two rows of blasthole group respectively on the blasting region, each the blasthole group includes at least one blasthole, each be equipped with the explosive and be used for detonating the detonator of explosive in the blasthole, each the number of sections of detonator in the blasthole is mutually different, wait to explode the district be close to in the blasthole of excavation region the number of sections of detonator is less than and keeps away from in the blasthole of excavation region, each be equipped with the filler in the blasthole position that is close to the opening of this blasthole respectively.
Preferably, each of the blast holes is vertically arranged on the corresponding blast region.
Preferably, the aperture of each blast hole is 30mm-45mm.
A method of reducing earth surface vibration in an area of an elevator hoistway to be blasted, comprising the steps of:
a. Confirming the rock hardness of the position where the elevator shaft is located;
b. Dividing the rock at the position of the elevator shaft into a plurality of layers of areas to be blasted from top to bottom according to the hardness of the rock;
c. setting an excavating area for mechanical excavation and a plurality of blasting areas for blasting, which are sequentially arranged in a straight line, on the uppermost layer of the area to be blasted according to the rock hardness;
d. C, arranging at least two rows of blast hole groups on the blasting area set in the step c according to the rock hardness, wherein each row of blast hole groups at least comprises one blast hole;
e. c, excavating the excavating area set in the step c in a mechanical excavating mode;
f. D, installing explosive and detonators for detonating the explosive in the blasting holes arranged in the step d respectively, wherein the number of sections of the detonators in the blasting holes is different from each other, the number of sections of the detonators in the blasting holes close to the excavation area on the area to be blasted is smaller than the number of sections of the detonators in the blasting holes far away from the excavation area, and the detonators are connected in parallel by using a lead and extend to a blasting safety area;
g. Filling a filler in each of the blastholes in which the explosive and the detonator are installed, at a position close to an opening of the blasthole;
h. Sequentially detonating the explosive in the blasting holes, and cleaning up residual rocks in the layer of the area to be blasted;
i. and c, sequentially repeating the steps c-h on the next layer of body to be blasted until the body to be blasted is excavated to the bottom of the elevator shaft.
Preferably, each of the blast holes is vertically arranged on the corresponding blast region.
Preferably, the aperture of each blast hole is 30mm-45mm.
Preferably, an electronic detonator is connected to the wire, and a detonation signal is sent to the electronic detonator in the blasting safety area.
By adopting the design scheme, the invention has the beneficial effects that: the area to be blasted is divided into one excavation area and a plurality of blasting areas for excavation in sequence, so that the explosive loading in the blastholes is reduced, and vibration caused by blasting is effectively reduced; the excavating area adopts mechanical excavation, so that a temporary surface is provided for blasting of the blasting area closest to the excavating area, and vibration generated during blasting of the blasting area is reduced; the number of the detonator sections in each blast hole is different, so that the blasting time of each blast hole is different, and the blasting areas are blasted in a hole-by-hole blasting mode, so that the vibration generated during blasting of the blasting areas is reduced; the number of the sections of the detonators in the blastholes close to the mining area on the blasting area is smaller than that of the sections of the detonators in the blastholes far away from the mining area, and rocks of the blasting area where the blastholes are blasted first are thrown out to generate a new temporary surface, so that the temporary surface is provided for the blastholes blasted later, and vibration generated by blasting is further reduced; the filler is arranged at the position of the explosion hole close to the opening, so that high-temperature and high-pressure gas generated during explosion is prevented from escaping from the opening of the explosion hole, the explosion effect is better, and the consumption of explosive is reduced.
Drawings
Fig. 1 is a partial cross-sectional view of an elevator hoistway of the present invention;
fig. 2 is a top view of the elevator hoistway of the present invention;
in the figure: m, the area to be blasted, n, the blasted area,
1. Digging area, 2, blast hole group, 21, blast hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-2, a structure of an elevator shaft area to be blasted for reducing earth's surface vibration comprises an area to be blasted m comprising an excavation area 1 for mechanical excavation and a plurality of blasting areas n for blasting which are sequentially arranged in a horizontal straight line; the excavation area 1 adopts mechanical excavation, provides a free surface for blasting of the blasting area n closest to the excavation area 1, and is beneficial to reducing vibration generated during blasting of the blasting area n.
At least two rows of blasting groups 2 are arranged in the vertical direction of each blasting area n, each row of blasting groups 2 at least comprises one blasting hole 21, each blasting hole 2 is vertically arranged on the corresponding blasting area n,
The aperture of each blast hole 21 is 30mm-45mm, in this embodiment, two rows of blast hole groups 2 are arranged on each blast area n, 3 blast holes 21 are arranged on each row of blast hole groups 2, explosive and detonators for detonating the explosive are arranged in each blast hole 21, the number of sections of the detonators in each blast hole 21 is different, and the number of sections of the detonators in the blast hole 21 close to the excavation area 1 on the blast area n is smaller than the number of sections of the detonators in the blast hole 21 far away from the excavation area 1; dividing the area m to be blasted into an excavation area 1 and a plurality of blasting areas n for excavation in sequence, so that the explosive loading in the blastholes 21 is reduced, and vibration caused by blasting is effectively reduced; the number of the detonator segments in each blast hole 21 is different from each other, so that the blasting time of each blast hole 21 is different from each other, and the blasting area n is blasted in a hole-by-hole blasting mode, so that the vibration generated during blasting of the blasting area n is reduced; the number of the detonator in the blasting hole 21 close to the excavation area 1 on the blasting area n is smaller than the number of the detonator in the blasting hole 21 far away from the excavation area 1, and the rock of the blasting area n where the blasting hole 21 is blasted first is thrown out to generate a new empty face, so that the empty face is provided for the blasting hole 21 blasted later, and the vibration generated by blasting is further reduced.
The positions, close to the openings of the blastholes 21, in the blastholes 21 are respectively provided with a filler; the filler is arranged at the position of the blast hole 2 close to the opening of the blast hole 21, so that high-temperature and high-pressure gas generated during blasting is prevented from escaping from the opening of the blast hole, the blasting effect is better, and the consumption of explosive is reduced.
The following describes a method of blasting an elevator shaft using the above-described construction of blasting an elevator shaft.
As shown in fig. 1-2, a method for reducing the vibration of the ground in an area to be blasted of an elevator shaft, comprises the steps of:
a. Confirming the rock hardness of the position where the elevator shaft is located;
b. Dividing the elevator shaft into a plurality of layers of areas m to be blasted from top to bottom according to the rock hardness, wherein the rock hardness refers to the rock hardness of the areas m to be blasted being greater than the preset rock hardness, and vibration generated by blasting cannot be reduced under the condition that the structure of the blasted elevator shaft provided by the embodiment is not adopted;
c. Setting an excavating area 1 for mechanical excavation and a plurality of blasting areas n for blasting, which are sequentially arranged in a horizontal straight line, on the uppermost layer of the area m to be blasted according to the rock hardness; the rock hardness here means that the rock hardness of the area m to be blasted is greater than the preset rock hardness, and the vibration generated by blasting cannot be reduced without adopting the structure of the blasted elevator shaft provided by the embodiment;
d. C, arranging at least two rows of blast hole groups 2 in the vertical direction of the blasting area n arranged in the step c according to the rock hardness, wherein each row of blast hole groups 2 at least comprises one blast hole 21, each blast hole 2 is vertically arranged on the corresponding blasting area n, and the aperture of each blast hole 21 is 30-45 mm; the rock hardness here means that the rock hardness of the blasting area n is greater than the preset rock hardness, and the vibration generated by blasting cannot be reduced without adopting the structure of the blasting elevator shaft provided in the present embodiment;
e. C, excavating the excavating area 1 set in the step c in a mechanical excavating mode;
f. D, installing explosive and detonators for detonating the explosive in each blast hole 21, wherein the number of sections of the detonators in each blast hole 21 is different from each other, the number of sections of the detonators in the blast hole 21 close to the excavation area 1 on the blasting area n is smaller than the number of sections of the detonators in the blast hole 21 far from the excavation area 1, and connecting the detonators together in parallel by using a conducting wire and extending the conducting wire to a blasting safety area; the safe area herein refers to a preset area that is not affected by the explosion when the explosive in the blast hole 21 explodes;
g. Filling filler in each of the blastholes 21 in which the blasting bag is installed at positions close to the openings of the blastholes 21; the filler is arranged at the position of the blast hole 21 close to the opening of the blast hole 21, so that high-temperature and high-pressure gas generated during blasting is prevented from escaping from the opening of the blast hole 21, the blasting effect is better, and the consumption of explosive is reduced;
h. An electronic detonator is connected to the lead, a detonation signal is sent to the electronic detonator in the blasting safety area, the detonation sequence of the explosive in the blasting holes 21 is controlled by the section number of the detonator, the explosive in the blasting holes 21 is detonated in sequence, and the layer of residual rock in the n area of the area to be blasted is cleaned;
i. and c, sequentially repeating the steps c-h on the next layer of body to be blasted until the body to be blasted is excavated to the bottom of the elevator shaft.
In summary, the excavation area 1 adopts mechanical excavation, which provides a free surface for blasting of the blasting area n closest to the excavation area 1, thereby being beneficial to reducing vibration generated during blasting of the blasting area n; dividing the area m to be blasted into an excavation area 1 and a plurality of blasting areas n for excavation in sequence, so that the explosive loading in the blastholes 21 is reduced, and vibration caused by blasting is effectively reduced; the number of the detonator segments in each blast hole 21 is different from each other, so that the blasting time of each blast hole 21 is different from each other, and the blasting area n is blasted in a hole-by-hole blasting mode, so that the vibration generated during blasting of the blasting area n is reduced; the number of the detonator in the blasting hole 21 close to the excavation area 1 on the blasting area n is smaller than the number of the detonator in the blasting hole 21 far away from the excavation area 1, and the rock of the blasting area n where the blasting hole 21 is blasted first is thrown out to generate a new empty face, so that the empty face is provided for the blasting hole 21 blasted later, and the vibration generated by blasting is further reduced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a reduce elevator shaft of earth's surface vibrations and wait to explode structure in region which characterized in that: the blasting device comprises a blasting area to be blasted, wherein the blasting area comprises an excavating area for mechanical excavation and a plurality of blasting areas for blasting, the excavating area and the blasting areas are sequentially arranged in a straight line, at least two rows of blasthole groups are respectively arranged on each blasting area, each row of blasthole groups at least comprises one blasthole, explosive and detonators for detonating the explosive are arranged in each blasthole, the sections of the detonators in each blasthole are different from each other, the sections of the detonators in the blastholes close to the excavating area on the blasting area are smaller than the sections of the detonators in the blastholes far away from the excavating area, and filling materials are respectively arranged at the positions, close to the openings of the blastholes, in each blasthole.
2. A structure of an elevator shaft area to be blasted for reducing earth's surface vibration as defined in claim 1, wherein: each of the blast holes is vertically arranged on the corresponding blast region.
3. A structure of an elevator shaft area to be blasted for reducing earth's surface vibration as defined in claim 1, wherein: the aperture of each blast hole is 30mm-45mm.
4. A method for reducing the vibration of the ground in an elevator shaft to-be-blasted area, which is characterized by comprising the following steps: the method comprises the following steps:
a. Confirming the rock hardness of the position where the elevator shaft is located;
b. Dividing the rock at the position of the elevator shaft into a plurality of layers of areas to be blasted from top to bottom according to the hardness of the rock;
c. setting an excavating area for mechanical excavation and a plurality of blasting areas for blasting, which are sequentially arranged in a straight line, on the uppermost layer of the area to be blasted according to the rock hardness;
d. C, arranging at least two rows of blast hole groups on the blasting area set in the step c according to the rock hardness, wherein each row of blast hole groups at least comprises one blast hole;
e. c, excavating the excavating area set in the step c in a mechanical excavating mode;
f. D, installing explosive and detonators for detonating the explosive in the blasting holes arranged in the step d respectively, wherein the number of sections of the detonators in the blasting holes is different from each other, the number of sections of the detonators in the blasting holes close to the excavation area on the area to be blasted is smaller than the number of sections of the detonators in the blasting holes far away from the excavation area, and the detonators are connected in parallel by using a lead and extend to a blasting safety area;
g. Filling a filler in each of the blastholes in which the explosive and the detonator are installed, at a position close to an opening of the blasthole;
h. Sequentially detonating the explosive in the blasting holes, and cleaning up residual rocks in the layer of the area to be blasted;
i. and c, sequentially repeating the steps c-h on the next layer of body to be blasted until the body to be blasted is excavated to the bottom of the elevator shaft.
5. A method of reducing earth vibration in an elevator hoistway area to be blasted as defined in claim 4, wherein: each of the blast holes is vertically arranged on the corresponding blast region.
6. A method of reducing earth vibration in an elevator hoistway area to be blasted as defined in claim 4, wherein: the aperture of each blast hole is 30mm-45mm.
7. A method of reducing earth vibration in an elevator hoistway area to be blasted as defined in claim 4, wherein: and an electronic detonator is connected to the lead, and a detonation signal is sent to the electronic detonator in the blasting safety area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910688173.XA CN110360906B (en) | 2019-07-29 | 2019-07-29 | Structure and method for reducing surface vibration in elevator shaft area to be blasted |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910688173.XA CN110360906B (en) | 2019-07-29 | 2019-07-29 | Structure and method for reducing surface vibration in elevator shaft area to be blasted |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110360906A CN110360906A (en) | 2019-10-22 |
| CN110360906B true CN110360906B (en) | 2024-06-18 |
Family
ID=68222520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910688173.XA Active CN110360906B (en) | 2019-07-29 | 2019-07-29 | Structure and method for reducing surface vibration in elevator shaft area to be blasted |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110360906B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910514A (en) * | 2016-04-21 | 2016-08-31 | 西北矿冶研究院 | Pre-punching subsection differential once blasting well completion method |
| CN107144194A (en) * | 2017-07-07 | 2017-09-08 | 贵州大学 | A kind of explosion shock dropping buffers band structure |
| CN210570272U (en) * | 2019-07-29 | 2020-05-19 | 华侨大学 | Elevator shaft to-be-blasted area structure capable of reducing earth surface vibration |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1434191A (en) * | 2002-01-25 | 2003-08-06 | 中国人民解放军工程兵第四十一旅 | Bore construction method by bore explosion |
| CN102809329A (en) * | 2012-08-17 | 2012-12-05 | 重庆市***工程建设有限责任公司 | Stone shallow hole blasting control method applied in town |
| CN103017620A (en) * | 2012-11-28 | 2013-04-03 | 泰兴市第一建筑安装工程有限公司 | Controlled blasting construction method for rock foundation pit |
| CN103321644B (en) * | 2013-05-29 | 2015-11-25 | 北京中铁瑞威基础工程有限公司 | The method of tunneling is combined in machinery and controlled blasting |
| CN204495211U (en) * | 2014-12-08 | 2015-07-22 | 上海市政工程设计研究总院（集团）有限公司 | A kind of blasting hole arrangement system of tunnel open excavation section |
| CN105484269B (en) * | 2015-10-20 | 2017-08-11 | 中铁十六局集团北京轨道交通工程建设有限公司 | Foundation pit enclosure structure seepage prevention and treatment construction method under blasting condition |
| CN107269284A (en) * | 2017-08-18 | 2017-10-20 | 徐工集团工程机械有限公司 | Hard rock tunnel excavation construction method |
| CN110006300B (en) * | 2019-04-26 | 2021-09-14 | 中建三局第三建设工程有限责任公司 | Blasting excavation method for soft rock and large-inclination-angle tunnel anchor digital detonator |
-
2019
- 2019-07-29 CN CN201910688173.XA patent/CN110360906B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910514A (en) * | 2016-04-21 | 2016-08-31 | 西北矿冶研究院 | Pre-punching subsection differential once blasting well completion method |
| CN107144194A (en) * | 2017-07-07 | 2017-09-08 | 贵州大学 | A kind of explosion shock dropping buffers band structure |
| CN210570272U (en) * | 2019-07-29 | 2020-05-19 | 华侨大学 | Elevator shaft to-be-blasted area structure capable of reducing earth surface vibration |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110360906A (en) | 2019-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108661643B (en) | It a kind of coal working face end adopts return channel and cuts top release shield lane method | |
| CN103629980B (en) | Near existing line steep massif Loose Control Blasting construction method | |
| CN107063014B (en) | Cutting shallow hole step controlled blasting slope cutting method in complex environment | |
| CN102607341B (en) | A kind of Stability of Open-pit Mine Slope controlled blasting method | |
| CN106767212B (en) | A kind of two-region undercut blast hole arrangement and its explosion well completion method of application | |
| CN109029168B (en) | Blasting treatment method for underground suspended roof | |
| CN102183184B (en) | Blast method for realizing vibration attenuation and protection of early-age concrete lining during tunnel construction | |
| CN110118084B (en) | Ultra-deep shaft construction method | |
| CN101441055A (en) | Presplit blasting method | |
| CN102733808A (en) | Closed pit open-pit mine ore recovery method | |
| CN110657722A (en) | Hole-by-hole initiation method for complex environment foundation pit excavation | |
| CN111442701A (en) | Refined blasting construction method for narrow deep foundation pit under complex geological condition | |
| CN110530219A (en) | A kind of control blasting method reducing loss and dilution | |
| CN106595410A (en) | Deep foundation pit earth pressure controlled blasting method | |
| CN104457466B (en) | A kind of blasting method of tunnel open excavation section | |
| CN113294156B (en) | Method for preventing rock burst of large-inclination-angle coal seam group by load reduction and prying reduction | |
| CN204495211U (en) | A kind of blasting hole arrangement system of tunnel open excavation section | |
| CN110360906B (en) | Structure and method for reducing surface vibration in elevator shaft area to be blasted | |
| CN210570272U (en) | Elevator shaft to-be-blasted area structure capable of reducing earth surface vibration | |
| KR20160076885A (en) | Blasting Method for Excavation of Bedrock Using Dozer | |
| CN110030001B (en) | Construction method for mountain tunnel to go out of hole | |
| CN111780633A (en) | Step-by-step rapid excavation method for IV-V-level surrounding rock lower step of double-track tunnel | |
| US20200088030A1 (en) | Underground shaft development method | |
| CN108195242B (en) | Rock blasting method | |
| CN110030889A (en) | A kind of method of deep hole subregion triangulation network slotting shaft formatting by one blasting |
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 |