CN111322921A - Device is clogged to tunnel blasting big gun hole - Google Patents
Device is clogged to tunnel blasting big gun hole Download PDFInfo
- Publication number
- CN111322921A CN111322921A CN202010356049.6A CN202010356049A CN111322921A CN 111322921 A CN111322921 A CN 111322921A CN 202010356049 A CN202010356049 A CN 202010356049A CN 111322921 A CN111322921 A CN 111322921A
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- Prior art keywords
- container
- partition plate
- plate
- space
- vertical
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Classifications
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- 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
- F42D1/18—Plugs for boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- 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
Abstract
The invention relates to a device for filling blasting holes of a tunnel, and belongs to the technical field of auxiliary devices of blasting engineering. The invention comprises a container with a closed structure, wherein a transverse clapboard is arranged in the middle of the container to divide the container into an upper space and a lower space, a vertical clapboard is arranged in the upper space of the container to divide the upper space of the container into an upper space A and an upper space B, the transverse clapboard is provided with a first preformed hole for communicating the lower space and the upper space A of the container, and the top of the vertical clapboard is provided with a second preformed hole for communicating the upper space A and the upper space B of the container; a first opening communicated with the upper layer space B is formed in the top plate or the top of the side wall of the container, and a first sealing cover is arranged on the first opening; the top of the side wall of the lower-layer space of the container or the transverse partition plate is provided with a second charging hole communicated with the lower-layer space of the container, and the second charging hole is provided with a second sealing cover; the container side wall is at least partially made of elastic material. The invention has convenient operation and high filling quality assurance.
Description
Technical Field
The invention relates to a device for filling blasting holes of a tunnel, and belongs to the technical field of auxiliary devices of blasting engineering.
Background
Drilling blasting is a common technology for tunnel excavation and is widely applied to the fields of water conservancy and hydropower, mines, traffic and the like. In the blasting construction process, the blast hole is plugged, so that the pressure of the detonation gas acting on the hole wall can be increased, the time of the pressure action is prolonged, the spalling degree and the throwing distance of the rock are greatly improved, and the blasting effect is improved. At present, materials are often used locally in engineering, materials such as mud chips and the like are generally adopted as stemming to fill blast holes, operation is inconvenient, and filling quality assurance is poor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the device is stuffed in tunnel blasting big gun hole that provides, and the operation of being convenient for, and it is high to fill quality assurance.
In order to solve the technical problems, the invention adopts the technical scheme that: the tunnel blasting blasthole filling device comprises a container with a closed structure, wherein a transverse partition plate is arranged in the middle of the container, so that the container is divided into an upper space and a lower space, a vertical partition plate is arranged in the upper space of the container, so that the upper space of the container is divided into an upper space A and an upper space B, the transverse partition plate is provided with a first reserved hole for communicating the lower space and the upper space A of the container, and a second reserved hole for communicating the upper space A and the upper space B of the container is arranged at the top of the vertical partition plate; a first charging hole communicated with the upper layer space B is formed in the top plate or the top of the side wall of the container, and a first sealing cover is arranged at the first charging hole; the top of the side wall of the lower-layer space of the container or the transverse partition plate is provided with a second charging opening communicated with the lower-layer space of the container, and the second charging opening is provided with a second sealing cover capable of being opened; when the inner end of the second charging port is arranged on the transverse partition, the second charging port is formed by a blanking pipe, and the inlet end of the blanking pipe is arranged on the top plate of the container or the outer side wall of the upper space of the container; the container side wall is at least partially made of elastic material.
Further, the method comprises the following steps: the side wall of the lower space of the container is made of elastic telescopic materials, the container bottom plate is connected with the transverse partition plate through the reinforcing rib plate, and the outer side wall of the upper space of the container, the container top plate, the container bottom plate, the transverse partition plate, the vertical partition plate and the reinforcing rib plate are made of rigid materials; the inner end of the second charging port is arranged on the transverse partition, the second charging port is formed by a blanking pipe, and the inlet end of the blanking pipe is arranged on the top plate of the container or the outer side wall of the upper space of the container.
Further, the method comprises the following steps: the reinforcing rib plates are of a plurality of rib plate structures arranged at intervals; the reinforcing rib plate is a net-shaped partition plate structure which divides the container into a left space and a right space.
Further, the method comprises the following steps: the container is internally provided with an explosion wire penetrating channel, the explosion wire penetrating channel is a pipeline penetrating through the container top plate and the container bottom plate, and the outer wall of the pipeline is connected with the container top plate and the outer wall of the pipeline is connected with the container bottom plate in a sealing manner.
Further, the method comprises the following steps: the container is cylindrical when upright, the transverse partition plate is arranged parallel to the container bottom plate, and the reinforcing rib plate is arranged vertical to the container bottom plate; the vertical partition plate is perpendicular to the transverse partition plate.
Further, the method comprises the following steps: the vertical partition plate is an annular plate, the upper end of the vertical partition plate is fixedly connected with the top plate of the container, and the lower end of the vertical partition plate is fixedly connected with the transverse partition plate; an inner side space enclosed by the container top plate, the transverse partition plate and the vertical partition plate is used as an upper layer space B, and a first charging hole communicated with the upper layer space B is formed in the container top plate; the first preformed holes on the transverse partition plate are distributed at intervals on the outer side of the vertical partition plate in an annular manner; the second preformed hole at the top of the vertical clapboard is distributed at intervals in an annular shape in the circumferential direction of the vertical clapboard.
Further, the method comprises the following steps: the vertical partition plate is an annular plate, the upper end of the vertical partition plate is fixedly connected with the top plate of the container, and the lower end of the vertical partition plate is fixedly connected with the transverse partition plate; an inner space enclosed by the container top plate, the transverse partition plate and the vertical partition plate is used as an upper space A; the first preformed holes on the transverse partition plate are distributed in the inner area of the vertical partition plate at intervals in an annular mode; the second preformed hole at the top of the vertical clapboard is distributed at intervals in an annular shape in the circumferential direction of the vertical clapboard.
When the tunnel blasting hole filling device is used for implementation, liquid materials are filled into the lower layer space of the container, and solid materials are filled into the upper layer space B of the container; the liquid material and the solid material are configured as two materials which can react to generate gas after being mixed. The device is provided with a first sealing cover and a second sealing cover, and materials can be reloaded when the device is implemented on site or can be preloaded when the device is produced and assembled in a factory. The two materials may be: water and dry ice, hydrochloric acid and calcium carbonate, aluminum sulfate and sodium bicarbonate, hydrogen peroxide and manganese dioxide, etc., as long as they can generate a large amount of gas.
The invention has the beneficial effects that: when the device is implemented, after the two materials are loaded, the device is always in a vertical state; when the blast hole needs to be plugged, the device is placed upside down and then directly plugged into the blast hole along the horizontal direction, and one end of the side wall made of the elastic telescopic material faces the inner side of the blast hole. The device is in the state of putting upside down, and liquid material loops through first preformed hole, second preformed hole, and the upper space B of flow direction, until with solid material contact, produce a large amount of gases after both mix for the flexible material inflation of elasticity, and then make the whole chucking of container in the big gun hole. According to the implementation process, the invention has the advantages of convenient operation and high filling quality assurance.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a schematic view A-A of FIG. 1;
FIG. 3 is a schematic view of B-B of FIG. 1;
FIG. 4 is a schematic view of the overall structure of the first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fourth embodiment of the present invention.
The labels in the figure are: 1-container, 2-transverse partition plate, 3-vertical partition plate, 4-upper space A, 5-upper space B, 6-first preformed hole, 7-second preformed hole, 8-reinforcing plate, 9-first sealing cover, 10-second sealing cover, 11-detonating cord, 12-blast hole, 13-charging section, 14-solid material, 15-liquid material and 16-detonating cord.
Detailed Description
For the purpose of promoting an understanding and an enabling description of the invention, reference should be made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings.
As shown in fig. 1 to 7, the present invention comprises a container 1 with a closed structure, wherein a horizontal partition plate 2 is arranged in the middle of the container 1 to divide the container 1 into two spaces of an upper layer and a lower layer, a vertical partition plate 3 is arranged in the upper layer of the container 1 to divide the upper layer of the container 1 into an upper layer space a4 and an upper layer space B5, the horizontal partition plate 2 is provided with a first preformed hole 6 communicating the lower layer space and the upper layer space a4 of the container 1, and the top of the vertical partition plate 3 is provided with a second preformed hole 7 communicating the upper layer space a4 and the upper layer space B5 of the container 1; a first charging opening communicated with the upper layer space B5 is formed in the top of the top plate or the top of the side wall of the container 1, and a first sealing cover 9 is arranged at the first charging opening; the top of the side wall of the lower layer space of the container 1 or the transverse partition plate 2 is provided with a second charging opening communicated with the lower layer space of the container 1, and the second charging opening is provided with a second sealing cover 10 which can be opened; when the inner end of the second charging port is arranged on the transversal partition 2, the second charging port is formed by a blanking duct, the inlet end of which is arranged on the top plate of the container 1 or on the outer side wall of the upper space of the container 1; the side wall of the container 1 is at least partially made of elastic material. In order to ensure that the structure of the sealing cover is stable and reliable, the first sealing cover 9 and the second sealing cover 10 can be installed in a threaded connection mode, and a sealing rubber strip is additionally arranged inside the sealing cover.
In order to ensure the stable structure of the device, the container 1 can be reliably clamped in the blast hole 12 finally, and the preferred embodiment is as follows: the lateral wall in the lower space of the container 1 is made of elastic telescopic materials, the bottom plate of the container 1 is connected with the transverse partition plate 2 through the reinforcing rib plate 8, and the lateral wall in the upper space of the container 1, the top plate of the container 1, the bottom plate of the container 1, the transverse partition plate 2, the vertical partition plate 3 and the reinforcing rib plate 8 are made of rigid materials. Wherein, for further improving device structural stability, to deep floor 8, still provide two kinds of preferred embodiments: the reinforcing rib plate 8 is a plurality of rib plate structures arranged at intervals; the reinforcing rib plate 8 is a net-shaped partition plate structure which divides the container 1 into a left space and a right space. In addition, the reinforcing rib plate 8 can be arranged into a multi-row structure arranged at intervals. The first 9 and second 10 sealing covers are preferably arranged on a piece of rigid material, so that the inner end of the second charging port is arranged on the transverse partition 2, the second charging port being formed by a blanking duct whose inlet end is arranged on the top plate of the container 1 or on the outer side wall of the upper space of the container 1. As shown in fig. 7, the inlet end of the blanking duct in this embodiment is arranged on the top plate of the container 1, and correspondingly, the second sealing cover 10 is also arranged on the top plate of the container 1.
The shape and specification of the container 1 are matched with the blast hole 12, and in order to ensure the structural stability of the device, the container 1 can be finally and reliably clamped in the blast hole 12, and the preferred embodiment is as follows: the container is cylindrical when upright, and the outer diameter is slightly smaller than the diameter of the blast hole 12 so as to be smoothly inserted into the blast hole 12; the transverse partition plate 2 is arranged in parallel to the bottom plate of the container 1, and the reinforcing rib plate 8 is arranged in perpendicular to the bottom plate of the container 1; the vertical partition 3 is perpendicular to the transverse partition 2.
The upper space of the container 1 may have various configurations, as shown in fig. 6, in which the vertical partition 3 is a flat plate, the left side is an upper space a4, and the right side is an upper space B5. Accordingly, the first prepared hole 6 is provided in the left side region of the transverse partition 2.
As shown in fig. 1 to 3, the vertical partition plate 3 is an annular plate, the upper end of the vertical partition plate 3 is fixedly connected with the top plate of the container 1, and the lower end of the vertical partition plate 3 is fixedly connected with the transverse partition plate 2; an inner side space enclosed by the top plate of the container 1, the transverse partition plate 2 and the vertical partition plate 3 is used as an upper layer space B5, and a first charging hole communicated with the upper layer space B5 is arranged on the top plate of the container 1; the first preformed holes 6 on the transverse partition plate 2 are distributed at intervals on the outer side of the vertical partition plate 3 in an annular manner; the second preformed holes 7 at the top of the vertical clapboard 3 are distributed at intervals in an annular shape in the circumferential direction of the vertical clapboard 3.
As shown in fig. 5, the vertical partition plate 3 is an annular plate, the upper end of the vertical partition plate 3 is fixedly connected with the top plate of the container 1, and the lower end of the vertical partition plate 3 is fixedly connected with the transverse partition plate 2; the inner space enclosed by the top plate of the container 1, the transverse partition plate 2 and the vertical partition plate 3 is used as an upper space A4; the first preformed holes 6 on the transverse partition plate 2 are distributed in the inner area of the vertical partition plate 3 at intervals in a ring shape; the second preformed holes 7 at the top of the vertical clapboard 3 are distributed at intervals in an annular shape in the circumferential direction of the vertical clapboard 3.
When the tunnel blasting hole filling device is used for implementation, the lower space of the container 1 is filled with the liquid material 15, and the upper space B5 of the container 1 is filled with the solid material 14; the liquid material 15 and the solid material 14 are configured as two materials that can react to produce a gas upon mixing. The device is provided with a first sealing cover 9 and a second sealing cover 10, and materials can be reloaded when the device is implemented on site or can be preloaded when the device is produced and assembled in a factory. The two materials may be: water and dry ice, hydrochloric acid and calcium carbonate, aluminum sulfate and sodium bicarbonate, hydrogen peroxide and manganese dioxide, etc., as long as they can generate a large amount of gas.
When the device is implemented, after the two materials are loaded, the device is always in a vertical state; when the blast hole 12 needs to be blocked, the device is placed upside down and then directly plugged into the blast hole 12 along the horizontal direction, one end of the side wall made of elastic telescopic material faces the inner side of the blast hole, the detonating cord 11 can penetrate out from the gap between the wall of the blast hole 12 and the device, certainly, a pipeline can be fixedly arranged in the middle of the device to serve as a penetrating channel of the detonating cord 11, preferably, a pipeline arrangement mode is adopted to avoid the detonating cord 11 from being deformed under pressure, the specific structure is shown in figures 1 to 4, the container 1 is provided with the detonating cord penetrating channel 16, the detonating cord penetrating channel 16 is a pipeline penetrating through the top plate of the container 1 and the bottom plate of the container 1, the outer wall of the pipeline is connected with the top plate of the container 1, and the outer wall of the pipeline is connected with the bottom plate of. The device is in the state of putting upside down, and liquid material 15 loops through first preformed hole 6, second preformed hole 7 in proper order, flows to upper space B5, until contacting with solid material 14, produces a large amount of gases after the two mixes for the flexible material inflation of elasticity, and then makes the whole chucking of container 1 in big gun hole 12.
The upper space of the container 1 preferably adopts the structural form shown in fig. 1 to 3, and as the first preformed holes 6 on the transverse partition plate 2 are distributed at intervals in an annular manner on the outer side of the vertical partition plate 3, and the second preformed holes 7 on the top of the vertical partition plate 3 are distributed at intervals in an annular manner in the circumferential direction of the vertical partition plate 3; therefore, no matter which direction the container 1 is placed upside down to the horizontal state, the mixing of the two materials can be realized more conveniently.
Claims (10)
1. Device is clogged to tunnel blasting big gun hole, its characterized in that: the container comprises a container (1) with a closed structure, wherein a transverse partition plate (2) is arranged in the middle of the container (1) to divide the container (1) into an upper space and a lower space, a vertical partition plate (3) is arranged in the upper space of the container (1) to divide the upper space of the container (1) into an upper space A (4) and an upper space B (5), the transverse partition plate (2) is provided with a first preformed hole (6) for communicating the lower space and the upper space A (4) of the container (1), and the top of the vertical partition plate (3) is provided with a second preformed hole (7) for communicating the upper space A (4) and the upper space B (5) of the container (1); a first charging opening communicated with the upper layer space B (5) is formed in the top plate or the top of the side wall of the container (1), and a first sealing cover (9) capable of being opened is arranged at the first charging opening; the top of the side wall of the lower layer space of the container (1) or the transverse partition plate (2) is provided with a second charging opening communicated with the lower layer space of the container (1), and the second charging opening is provided with a second sealing cover (10) which can be opened; when the inner end of the second charging port is arranged on the transverse partition (2), the second charging port is formed by a blanking pipe, and the inlet end of the blanking pipe is arranged on the top plate of the container (1) or the outer side wall of the upper space of the container (1); the side wall of the container (1) is at least partially made of elastic material.
2. The device for filling the blast hole of the tunnel blasting according to claim 1, wherein the side wall of the lower space of the container (1) is made of elastic telescopic materials, the bottom plate of the container (1) is connected with the transverse partition plate (2) through a reinforcing rib plate (8), the outer side wall of the upper space of the container (1), the top plate of the container (1), the bottom plate of the container (1), the transverse partition plate (2), the vertical partition plate (3) and the reinforcing rib plate (8) are made of rigid materials; the inner end of the second charging opening is arranged on the transverse partition (2), the second charging opening is formed by a blanking pipe, and the inlet end of the blanking pipe is arranged on the top plate of the container (1) or the outer side wall of the upper space of the container (1).
3. The device for plugging the blast hole of the tunnel blasting according to claim 2, wherein the reinforcing rib plate (8) is a plurality of rib plate structures arranged at intervals; the reinforcing rib plate (8) or a net-shaped clapboard structure which divides the container (1) into a left space and a right space.
4. The device for plugging the blast hole of the tunnel blasting according to claim 1, wherein the container (1) is provided with a detonating cord penetrating passage (16), the detonating cord penetrating passage (16) is a pipeline penetrating through a top plate of the container (1) and a bottom plate of the container (1), and the outer wall of the pipeline is connected with the top plate of the container (1) and the outer wall of the pipeline is connected with the bottom plate of the container (1) in a sealing manner.
5. The device for stemming the blasthole of tunnel blasting according to claim 1, characterized in that the container (1) is cylindrical when erected, and the transverse partition (2) is arranged parallel to the bottom plate of the container (1); the vertical partition plate (3) is vertical to the transverse partition plate (2).
6. The device for filling the blast hole of the tunnel blasting according to claim 2, wherein the container (1) is cylindrical when erected, the transverse partition plate (2) is arranged in parallel with the bottom plate of the container (1), and the reinforcing rib plate (8) is arranged in perpendicular to the bottom plate of the container (1); the vertical partition plate (3) is vertical to the transverse partition plate (2).
7. The device for plugging the blast hole of the tunnel blasting according to any one of the claims 1 to 6, wherein the vertical clapboard (3) is an annular plate, the upper end of the vertical clapboard (3) is fixedly connected with the top plate of the container (1), and the lower end of the vertical clapboard (3) is fixedly connected with the transverse clapboard (2); an inner side space enclosed by a top plate of the container (1), the transverse partition plate (2) and the vertical partition plate (3) is used as an upper-layer space B (5), and a first charging hole communicated with the upper-layer space B (5) is formed in the top plate of the container (1); the first preformed holes (6) on the transverse partition plate (2) are distributed at intervals on the outer side of the vertical partition plate (3) in an annular manner; the second preformed holes (7) at the top of the vertical partition plate (3) are distributed at intervals in an annular mode in the circumferential direction of the vertical partition plate (3).
8. The device for plugging the blast hole of the tunnel blasting according to any one of the claims 1 to 6, wherein the vertical clapboard (3) is an annular plate, the upper end of the vertical clapboard (3) is fixedly connected with the top plate of the container (1), and the lower end of the vertical clapboard (3) is fixedly connected with the transverse clapboard (2); an inner side space enclosed by a top plate, a transverse partition plate (2) and a vertical partition plate (3) of the container (1) is used as an upper layer space A (4); the first preformed holes (6) on the transverse partition plate (2) are distributed in the inner area of the vertical partition plate (3) at intervals in a ring shape; the second preformed holes (7) at the top of the vertical partition plate (3) are distributed at intervals in an annular mode in the circumferential direction of the vertical partition plate (3).
9. The device for stemming a tunnel blasting hole with preloading, characterized in that the device for stemming a tunnel blasting hole according to any of claims 1 to 8 is used, the lower level space of the container (1) is preloaded with liquid material (15), and the upper level space B (5) of the container (1) is preloaded with solid material (14); the liquid material (15) and the solid material (14) are configured as two materials that can react to produce a gas upon mixing.
10. The apparatus for stemming a blast hole from a tunnel with a pre-charge according to claim 9, wherein the liquid material (15) and the solid material (14) are one of the following combinations: water and dry ice, hydrochloric acid and calcium carbonate, aluminum sulfate and sodium bicarbonate, hydrogen peroxide and manganese dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356049.6A CN111322921A (en) | 2020-04-29 | 2020-04-29 | Device is clogged to tunnel blasting big gun hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356049.6A CN111322921A (en) | 2020-04-29 | 2020-04-29 | Device is clogged to tunnel blasting big gun hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111322921A true CN111322921A (en) | 2020-06-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010356049.6A Pending CN111322921A (en) | 2020-04-29 | 2020-04-29 | Device is clogged to tunnel blasting big gun hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111322921A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846278A (en) * | 1986-05-21 | 1989-07-11 | Du Pont (Australia) Ltd. | Borehole plug and method |
| CN201764916U (en) * | 2010-06-12 | 2011-03-16 | 中铁十六局集团有限公司 | Blast hole sealing plug |
| CN102052082A (en) * | 2010-08-05 | 2011-05-11 | 国风 | Implosion type expansion plugging bag |
| CN103113754A (en) * | 2013-01-04 | 2013-05-22 | 樊运策 | Self-sealing type tamping plug for bursting |
| CN105258584A (en) * | 2015-11-20 | 2016-01-20 | 葛洲坝易普力湖北昌泰民爆有限公司 | Air spacer |
| CN105674822A (en) * | 2016-04-11 | 2016-06-15 | 中国电建集团成都勘测设计研究院有限公司 | Blasting engineering air spacer and spaced loading method |
-
2020
- 2020-04-29 CN CN202010356049.6A patent/CN111322921A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846278A (en) * | 1986-05-21 | 1989-07-11 | Du Pont (Australia) Ltd. | Borehole plug and method |
| CN201764916U (en) * | 2010-06-12 | 2011-03-16 | 中铁十六局集团有限公司 | Blast hole sealing plug |
| CN102052082A (en) * | 2010-08-05 | 2011-05-11 | 国风 | Implosion type expansion plugging bag |
| CN103113754A (en) * | 2013-01-04 | 2013-05-22 | 樊运策 | Self-sealing type tamping plug for bursting |
| CN105258584A (en) * | 2015-11-20 | 2016-01-20 | 葛洲坝易普力湖北昌泰民爆有限公司 | Air spacer |
| CN105674822A (en) * | 2016-04-11 | 2016-06-15 | 中国电建集团成都勘测设计研究院有限公司 | Blasting engineering air spacer and spaced loading method |
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Application publication date: 20200623 |
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| RJ01 | Rejection of invention patent application after publication |