CN113738370B - Low-mining-shear-ratio medium-length hole stope bottom structure and recovery method - Google Patents
Low-mining-shear-ratio medium-length hole stope bottom structure and recovery method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000011084 recovery Methods 0.000 title claims abstract description 46
- 239000011435 rock Substances 0.000 claims abstract description 58
- 238000005553 drilling Methods 0.000 claims abstract description 55
- 238000005422 blasting Methods 0.000 claims abstract description 32
- 238000005520 cutting process Methods 0.000 claims abstract description 24
- 238000010008 shearing Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 230000005641 tunneling Effects 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 23
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
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- 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
- E21C41/22—Methods of underground mining; Layouts therefor for ores, e.g. mining placers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/20—Recycling
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Abstract
The invention provides a bottom structure of a medium-length hole stope with a low mining-to-cutting ratio and a recovery method. A small-section rock drilling tunnel is tunneled in the middle of the large triangular ore pillar, a sector blast hole is drilled in an upward medium-length hole, and ores are collapsed in a differential blasting mode to achieve the purpose of recycling; and (5) adopting the same method until the recovery of the large triangular ore pillar in the bottom structure of the whole medium-length hole stope is finished. According to the invention, the bottom structure of the medium-length hole stope is changed, so that the quantity of the bottom pillars to be recovered is reduced, the volume is increased, only one bottom pillar needs to be recovered in every two stopes, the mining and cutting process quantity is reduced, and the recovery rate, stability and safety of the bottom pillars are improved; the loss rate of ores is reduced, the mining income is increased, and remarkable economic benefits are generated.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a bottom structure of a medium-length hole stope with a low mining-cutting ratio and a recovery method.
Background
In the process of continuous development of society, the problem of mineral resource shortage is increasingly highlighted; mineral resources belong to non-renewable resources, so the mineral resource exploration and development are enhanced, the mineral recovery efficiency is continuously improved, and the mineral resources are recovered from the mined ore deposit to the maximum extent. In order to stabilize the yield of the mine fundamentally, a large amount of residual ore bodies and ore pillars in a stope need to be effectively recycled, so that the utilization efficiency of mine resources can be improved, and the service life of the mine is prolonged. The pillar recovery refers to the recovery of the pillars such as the safety pillars, the rock pillars and the bottom pillars reserved for mining after the mining of a certain section of mine field is finished. Most of metal mines retain various types of ore pillars, and the statistical data shows that the ore pillar amount accounts for about 30-40% of the mining amount of the mine. The large overstocking of ore pillars can cause a large amount of losses of ore resources, and serious potential safety hazards exist, so that the stoping of the ore pillars has great influence on the production, safety and economic benefits of a mine.
At present, for ore bodies with near-horizontal thickness and steep-dip thickness and large mining technical conditions, when ore rocks belong to medium and above rock conditions, a sublevel rock drilling sublevel ore removal subsequent filling mining method or a sublevel rock drilling stage ore removal subsequent filling mining method is generally adopted for stoping, and the mining method has the advantages of small stoping amount, high production capacity, high safety, small loss index and the like.
When most medium-length hole stopes are used for mining and blasting, the ore is subjected to collapse blasting by a damping blasting method from a construction upper fan-shaped medium-length hole, and then ore is removed by adopting a trench bottom structure, so that the bottom of the stope can form a V-shaped structure; in the production process, the ore amount in the trench bottom structure cannot be recovered along with the normal blasting process of the discharge surface, so that a part of ore amount is remained in the stope after the stope is filled. Two adjacent stopes all adopt same bottom structures, make two stopes intersect and form a triangular ore pillar, and the recovery of triangular ore pillar has always been a big difficult problem that puzzles mine production. The recovery of the triangular ore pillar of the bottom structure of the medium-deep hole stope is related to the size of the triangular ore pillar and the quality of the filling body; when the triangular ore pillar is small in size, the selection of the ore pillar recovery construction equipment is greatly restricted; when the quality of the filling body is poor, the triangular ore pillar reserves the dado ore with larger thickness, so that the ore recovery rate of the ore pillar is low.
In view of the above, there is a need for an improved bottom structure of a medium-length stope with low mining-to-cutting ratio and a recovery method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide a bottom structure of a medium-length hole stope with a low mining-cutting ratio and a recovery method. The method has high safety, reduces the mining and cutting engineering quantity, improves the mining efficiency and the ore recovery rate, and generates remarkable economic benefit.
In order to achieve the aim, the invention provides a bottom structure of a medium-length hole stope with a low mining-to-cutting ratio, which comprises a plurality of adjacent unit stopes, wherein each unit stope comprises two adjacent sectional stopes which are distributed in a mirror symmetry manner; rock drilling roadways which are in mirror symmetry distribution are arranged in the two sectional stopes, and the distance between the central axes of the two rock drilling roadways is larger than the width of a single sectional stope, so that a large ore pillar is formed; two big ore pillar middle part of triangle between the rock drilling tunnel is equipped with small cross section rock drilling tunnel, and is right in order to realize the recovery of big ore pillar of triangle.
As a further improvement of the method, the distance between the central shafts of the two rock drilling roadways is 1.3-1.45 times of the width of a single sublevel stope.
As a further improvement of the invention, the triangular large pillar consists of two adjacent large pillars, a small pillar is formed between two adjacent unit stopes, and the horizontal angles of the free surfaces of the small pillar and the large pillar are the same and are 45-55 degrees.
As a further improvement of the invention, a vein-passing ore removal roadway, a middle-section transportation flat roadway, a ore-sliding connection roadway and a ore-sliding shaft are also arranged in the unit stope.
The recovery method of the bottom structure of the medium-length hole stope with the low mining-to-cutting ratio comprises the following steps:
s1, tunneling the small-section rock drilling roadway among the triangular large ore pillars in the unit stopes;
s2, constructing an upward medium-length hole fan-shaped blast hole in the small-section rock drilling roadway in the step S1; carrying out charging and blasting work on the upward fan-shaped medium-length hole blast holes, and carrying out ore removal on the caving ore;
and S3, completing the recovery of the large triangular pillars in the bottom structure in the whole medium-length hole stope by adopting the same method as the steps S1-S2.
As a further improvement of the present invention, in step S1, the specification of the small-section rock drilling roadway is set according to the quality of the filling bodies in the unit stope.
As a further improvement of the invention, when the strength of the filling body is more than 2MPa, the small-section rock drilling roadway can be a roadway with the same specification as the rock drilling roadway in the sublevel stope.
In a further improvement of the present invention, in step S2, the blasting is performed by intra-row differential blasting, and the delay interval time is 25-75 ms.
As a further improvement of the invention, the blasting sequence is that the blastholes on two sides in the row are blasted in sequence according to the middle blasthole.
In a further improvement of the invention, in step S2, the hole bottom pitch of the upward medium-length hole fan-shaped blast hole is 2.0-2.5 m.
The invention has the beneficial effects that:
1. the bottom structure of the medium-length hole stope with the low mining-to-cutting ratio comprises a plurality of adjacent unit stopes, wherein each unit stope comprises two adjacent sectional stopes which are distributed in a mirror symmetry manner; rock drilling roadways which are in mirror symmetry distribution are arranged in the two sectional stopes, and the distance between the central shafts of the two rock drilling roadways is larger than the width of a single sectional stope, so that a large ore pillar is formed. Wherein, two large ore pillars of two adjacent sublevel stopes are adjacently distributed, so that a triangular large ore pillar with larger volume and easy recovery can be formed; and a small-section rock drilling tunnel is arranged in the middle of the large triangular ore pillar to realize the recovery of the large triangular ore pillar. According to the invention, the bottom structure of the medium-deep hole stope is changed, so that the number of the bottom pillars required to be recovered in the subsequent engineering is reduced, only one bottom pillar is required to be recovered in every two stopes, the mining and cutting engineering quantity is reduced, and the recovery rate of the bottom pillars is improved; and the stability and the security of big base pillar are higher.
2. The invention relates to a recovery method of a bottom structure of a medium-length hole stope with a low mining-to-cutting ratio, which is characterized in that two adjacent sectional stopes distributed in a mirror symmetry manner are combined to be used as a unit stope, and a small-section rock drilling tunnel is tunneled in the middle of a large triangular ore pillar formed in the unit stope; after the upward medium-length hole sector blast holes are constructed in the rock drilling roadway, the triangular large ore pillars are collapsed in a differential blasting mode, and the purpose of recovery is achieved; and (4) adopting the same method until the recovery of the large triangular ore pillars in the bottom structure in the whole medium-length hole stope is completed. The method takes two sublevel stopes as unit stopes, forms large-volume ore pillars by changing the position of a rock drilling roadway, and recovers the ore pillars by adopting a differential blasting mode, thereby reducing the loss rate of ores and increasing the mining income.
3. The bottom pillar recovery is carried out by adopting the medium-length hole differential blasting method, the impact force after the differential blasting is small, the damage to a filling body is reduced, the dilution rate of ores after ore removal is reduced, the mining quality is improved, and meanwhile, the safety of the bottom pillar recovery process is improved.
Drawings
FIG. 1 is a schematic diagram of a bottom structure of a medium-length hole stope with a low mining-to-cutting ratio.
Fig. 2 is a stope top view of a bottom structure of a medium-length hole stope with a low mining-to-cutting ratio.
Fig. 3 is a stope layout schematic diagram of a bottom structure of a medium-length hole stope with a low mining-to-shearing ratio.
Reference numerals
100-unit stope; 1-sectional stope; 11-rock drilling roadway; 12-small pillars; 13-large pillar; 14-triangular large pillar; 141-small section rock drilling roadway; 142-upward medium-length hole sector blast holes; 2-drawing a vein through ore removal roadway; 3-middle section transportation flat roadway; 4-ore pass communication roadway; 5-slipping the mine; 6-filling body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
A bottom structure of a medium-length hole stope with a low mining-to-cutting ratio comprises a plurality of adjacent unit stopes 100, wherein each unit stope 100 comprises two adjacent subsection stopes 1 which are distributed in a mirror symmetry manner; rock drilling roadways 11 which are distributed in a mirror symmetry mode are arranged in the two sublevel stopes 1, and the distance between the central axes of the two rock drilling roadways 11 is larger than the width of the single sublevel stope 1, so that a large ore pillar 13 is formed; the middle part of the large triangular ore pillar 14 between the two rock drilling roadways 11 is provided with a small-section rock drilling roadway 141 so as to realize the recovery of the large triangular ore pillar 14.
Specifically, the distance between the central axes of the two rock drilling roadways 11 is 1.3-1.45 times of the width of the single sublevel stope 1, and the horizontal angles of the free surfaces of the small ore pillars 12 and the large ore pillars 13 in the sublevel stope 1 are the same and are 45-55 degrees. Two large ore pillars 13 of two adjacent sublevel stopes 1 are adjacently distributed to form a triangular large ore pillar 14 which has larger volume and is easy to recover. In addition, a vein-through ore removal roadway 2, a middle-section transportation flat roadway 3, a ore-sliding connection roadway 4 and a ore-sliding shaft 5 are also arranged in the unit stope 100.
In particular, referring to fig. 3, the location of the rock drilling tunnel 11 is modified from the conventional arrangement in the centre of the stope to a location where the distance between the central axes of the two rock drilling tunnels 11 is greater than the width of a single sublevel stope 1. Two large pillars 13 of two adjacent sublevel stopes 11 are adjacently distributed, and a triangular large pillar 14 which is larger in volume and easy to recover is formed. According to the invention, the bottom structure of the medium-deep hole stope is changed, so that the number of the bottom pillars required to be recovered is reduced, only one bottom pillar is required to be recovered in every two stopes, the mining and cutting engineering quantity is reduced, the recovery rate can reach 40-60%, and compared with the recovery rate of a traditional bottom pillar recovery mode which is 20-40%, the recovery rate of the bottom pillars is greatly improved, and the economic benefit of mining is improved; and the stability and the security of big base pillar are higher, are favorable to safe construction.
A recovery method of a bottom structure of a medium-length hole stope with a low mining-to-cutting ratio comprises the following steps:
s1, tunneling small-section rock drilling tunnels 141 among the triangular large ore pillars 14 in the unit stopes 100;
wherein the specification of the small-section rock drilling roadway 141 is set according to the quality of the filling body 6 in the unit stope 100, and when the strength of the filling body 6 is more than 2MPa, the small-section rock drilling roadway 141 of the large triangular pillar 14 can select a roadway with the same specification as the rock drilling roadway 11 in the sublevel stope 1.
S2, constructing upward medium-length hole fan-shaped blast holes 142 in the small-section rock drilling roadway 141 in the step S1; charging and blasting the upward fan-shaped medium-length hole blast holes 142, and removing the ore from the collapsed ore;
wherein, the hole bottom distance of the upward medium-length hole fan-shaped blast hole 142 is 2.0-2.5 m. The blasting adopts a row-inside differential blasting method, and the delay interval time is 25-75 ms; the blasting sequence is that the blast holes at two sides are blasted in sequence from the middle blast hole in the row. The bottom pillar recovery is carried out by adopting the medium-length hole differential blasting method, the impact force after the differential blasting is small, the damage to a filling body is reduced, the dilution rate of ore after ore removal is reduced, the mining quality is improved, and meanwhile, the safety of the bottom pillar recovery process is improved.
In a specific embodiment, the hole bottom distance of the upward medium-length hole fan-shaped blast holes 142 is 2.0m, and the row internal delay interval time of the differential blasting is 50 ms.
And S3, recovering the large triangular ore pillar 14 in the bottom structure in the whole medium-length hole stope by adopting the same method as the steps S1-S2.
According to the invention, two adjacent sublevel stopes 1 which are symmetrically distributed in a mirror image mode are combined into a unit stope 100, and a small-section rock drilling roadway 141 is tunneled in the middle of a large triangular pillar 14 in the unit stope 100; after the upward medium-length hole sector-shaped blast holes 142 are constructed in the rock drilling roadway 11, large ore pillars are collapsed in a differential blasting mode; the same method is adopted until the recovery of the triangular large ore pillar 14 with the bottom structure in the whole medium-length hole stope is completed. The method takes two sublevel stopes 1 as a unit stope 100, forms large-volume ore pillars by changing the position of a rock drilling roadway 11, and recovers the ore pillars by adopting a differential blasting mode, thereby reducing the loss rate of the ore and increasing the mining income.
Example 1
Referring to fig. 1 to 3, the bottom structure of a low mining-to-cutting ratio medium-length hole stope of the present invention includes a plurality of adjacent unit stopes 100, each unit stope 100 includes two mirror-image-symmetric adjacent sublevel stopes 1 with widths of 15m, each sublevel stope 1 is provided with rock drilling tunnels 11 distributed in mirror-image-symmetric manner, and a distance between central axes of the two rock drilling tunnels 11 is greater than a width of each sublevel stope 1, so as to form a large pillar 13. Two large ore pillars 13 of two adjacent sublevel stopes 1 are combined to form a triangular large ore pillar 14 which has the width of 15.6m and the height of 13m and is easy to recover; a small-section rock drilling roadway 141 is arranged in the middle of the large triangular ore pillar 14. Wherein, the horizontal angles of the free surfaces of the small ore pillars 12 and the large ore pillars 13 in the sublevel stope 1 are both 45 degrees. In addition, a vein-penetrating ore removal roadway 2, a middle-section transportation flat roadway 3, a ore-sliding connection roadway 4 and an ore-sliding mine 5 are also arranged in the unit stope 100. And (3) forming the bottom structure of the medium-length hole stope after the medium-length hole stope is mined, and recovering the bottom structure of a gob area at the upper part of the stope after the gob area at the upper part of the stope is filled with a high-strength filling body 6.
A recovery method of a bottom structure of a medium-length hole stope with a low mining-cutting ratio comprises the steps of excavating a small-section rock drilling roadway 141 in the middle of a large triangular ore pillar 14 in a plurality of unit stopes 100; constructing upward medium-length hole fan-shaped blast holes 142 in the small-section rock drilling roadway 141; and (4) carrying out charging and blasting work on the upward fan-shaped medium-length hole blast holes 142, and carrying out ore removal on the caving ore. Wherein, the hole bottom distance of the upward medium-length hole fan-shaped blast hole 142 is 2.0 m. The blasting adopts a row-inside differential blasting method, and the delay interval time is 50 ms; the blasting sequence is that the blast holes at two sides are blasted in sequence in the row according to the middle blast hole. And (4) recovering the large triangular pillars 14 by adopting the same method, and finally recovering the large triangular pillars 14 in the bottom structure in the whole medium-length hole stope.
In summary, according to the bottom structure of the medium-length hole stope with the low mining-to-cutting ratio and the recovery method provided by the invention, the bottom structure of the medium-length hole stope is optimized, two sublevel stopes which are distributed in a mirror symmetry manner are combined into a unit stope, two rock drilling tunnels which are distributed in a mirror symmetry manner are arranged in the two sublevel stopes, the distance between the central axes of the two rock drilling tunnels is larger than the width of the single sublevel stope, and a triangular large ore pillar which is larger in size and easy to recover is formed. Digging a small-section rock drilling tunnel in the middle of a large triangular pillar in a unit stope, constructing upward medium-length hole sector blast holes in the rock drilling tunnel, and caving down ores in a micro-difference blasting mode to achieve the purpose of recovering the large triangular pillar; and (5) adopting the same method until the recovery of the large triangular ore pillar with the bottom structure in the whole medium-length hole stope is completed. According to the invention, the bottom structure of the medium-deep hole stope is changed, so that the number of the bottom pillars required to be recovered is reduced, only one bottom pillar is required to be recovered in every two stopes, the mining and cutting process quantity is reduced, the recovery rate can reach 40-60%, and compared with the recovery rate of a traditional bottom pillar recovery mode which is 20-40%, the recovery rate of the bottom pillars is greatly improved; and the stability and the security of big base pillar are higher. And the bottom structure of the medium-length hole stope is efficiently recovered by adopting a medium-length hole differential blasting method, the method has high safety, the mining and cutting engineering quantity is reduced, the mining efficiency and the ore recovery rate are improved, and remarkable economic benefits are generated.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (9)
1. A bottom structure of a medium-length hole stope with a low mining-to-shearing ratio is characterized by comprising a plurality of adjacent unit stopes, wherein each unit stope comprises two adjacent segmented stopes which are in mirror symmetry distribution; rock drilling roadways which are in mirror symmetry distribution are arranged in the two sectional stopes, and the distance between the central axes of the two rock drilling roadways is larger than the width of a single sectional stope, so that a large ore pillar is formed; a small-section rock drilling tunnel is arranged in the middle of the large triangular ore pillar between the two rock drilling tunnels to realize the recovery of the large triangular ore pillar;
the distance between the central shafts of the two rock drilling roadways is 1.3-1.45 times of the width of a single sublevel stope; the triangular large ore pillar consists of two adjacent large ore pillars, and a small ore pillar is formed between two adjacent unit stopes.
2. The bottom structure of a medium-length hole stope with a low mining-to-shearing ratio as claimed in claim 1, wherein the horizontal angles of the free surfaces of the small ore pillars and the large ore pillars are the same and are 45-55 degrees.
3. The bottom structure of a medium-length hole stope with a low mining-to-shearing ratio as claimed in claim 1, wherein a vein-through ore removal roadway, a middle section transportation flat roadway, a ore-sliding connection roadway and an ore-sliding shaft are further arranged in the unit stope.
4. A method for recovering a bottom structure of a medium-length hole stope with a low mining-to-cutting ratio according to any one of claims 1 to 3, comprising the following steps:
s1, tunneling the small-section rock drilling roadway among the triangular large ore pillars in the unit stopes;
s2, constructing an upward medium-length hole fan-shaped blast hole in the small-section rock drilling roadway in the step S1; carrying out charging and blasting work on the upward fan-shaped medium-length hole blast holes, and carrying out ore removal on the caving ore;
and S3, completing the recovery of the large triangular pillars in the bottom structure in the whole medium-length hole stope by adopting the same method as the steps S1-S2.
5. The method for recovering a low mining-shear ratio medium-length hole stope bottom structure according to claim 4, wherein in step S1, the specification of the low-profile rock drilling roadway is set according to the quality of a filling body in the unit stope.
6. The method for recovering the bottom structure of the medium-length hole stope with the low mining-to-cutting ratio as claimed in claim 5, wherein the specification of the small-section rock drilling roadway is the same as that of the rock drilling roadway in the sublevel stope when the strength of the filling body is greater than 2 MPa.
7. The method for recovering the bottom structure of the medium-length hole stope with the low mining-to-cutting ratio as claimed in claim 4, wherein in step S2, the blasting is performed by an intra-row differential blasting method, and the delay interval time is 25-75 ms.
8. The method for recovering the bottom structure of the medium-length hole stope with the low mining-to-shearing ratio as claimed in claim 7, wherein the blasting sequence is that the blastholes in the row are blasted in sequence from the middle blasthole to the two side blastholes.
9. The method for recovering the bottom structure of the medium-length hole stope with the low mining-to-shearing ratio as claimed in claim 4, wherein in the step S2, the hole bottom distance of the upward medium-length hole fan-shaped blast holes is 2.0-2.5 m.
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2021
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| CN106223958A (en) * | 2016-08-10 | 2016-12-14 | 山东华联矿业股份有限公司 | The slant middle thick orebody subregion rock drilling stage ore deposit afterwards filling that falls works in coordination with mining codes |
| CN107339104A (en) * | 2017-08-03 | 2017-11-10 | 长沙矿山研究院有限责任公司 | Security personnel's curtain wall recovery method |
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