CN115234267A - Mining sliding support structure for gentle dip medium-thickness ore deposit and use method thereof - Google Patents
Mining sliding support structure for gentle dip medium-thickness ore deposit and use method thereof Download PDFInfo
- Publication number
- CN115234267A CN115234267A CN202210616478.1A CN202210616478A CN115234267A CN 115234267 A CN115234267 A CN 115234267A CN 202210616478 A CN202210616478 A CN 202210616478A CN 115234267 A CN115234267 A CN 115234267A
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- Prior art keywords
- sliding
- support
- sliding support
- track
- steel
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Links
- 238000005065 mining Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 81
- 239000010959 steel Substances 0.000 claims abstract description 81
- 238000010276 construction Methods 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 26
- 239000011435 rock Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 208000037805 labour Diseases 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 229910052585 phosphate mineral Inorganic materials 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D19/00—Provisional protective covers for working space
- E21D19/02—Provisional protective covers for working space for use in longwall working
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a sliding support structure for mining of a gently inclined medium-thickness ore deposit and a using method thereof. And whole steel guard shield can slide on the track through two sets of supports that slide, conveniently removes whole steel guard shield, can play temporary support in the position that the mine opening need be under construction, simple structure, convenient to use.
Description
Technical Field
The invention relates to the technical field of mine support, in particular to a mining sliding support structure for a gently inclined medium-thickness ore deposit and a using method thereof.
Background
The inclined gentle-inclined medium-thickness ore body is a common ore body form in China, and the ore body of the inclined gentle-inclined medium-thickness ore body accounts for more than 70% of the total reserves of chemical mines, 35% of gypsum deposits in building material mines and 18% of iron deposits in metallurgical mines. For such deposits, underground mining is a weak link, and the reason for gently inclining the medium-thickness ore body is mainly limited by the inclination angle and the thickness of the ore body.
Phosphate rock is a generic term for phosphate minerals that can be economically utilized, and is an important raw material for chemical minerals. It can be used to prepare phosphate fertilizer, yellow phosphorus, phosphoric acid, phosphide and other phosphates, and can be used in medicine, food, match, dye, sugar, ceramics and national defence industries.
When mining thick ore body phosphorus ore to slope gently slope through machinery, can adopt supporting construction to support the ore hole, prevent that the ore hole from collapsing, and current phosphorus ore exploitation supporting construction, the mode that adopts scaffold concatenation mostly supports, in the supporting construction work progress in ore hole, need the segmentation to remove at the ore hole position on soft rock stratum and strut, prevent that the condition that collapses from appearing in soft rock stratum position, when constructor carries out interim construction under the ore hole on soft rock stratum, need build interim scaffold support structure, need dismantle after the construction is accomplished and build interim scaffold support structure, cause the efficiency of construction to reduce, a large amount of labours have been increased.
Disclosure of Invention
The invention mainly aims to provide a mining sliding support structure for a gently inclined medium-thickness ore deposit and a using method thereof, and solves the problem that construction efficiency is reduced as constructors need to build a temporary scaffold support structure when carrying out temporary construction under a mine hole of a soft rock stratum, and the temporary scaffold support structure needs to be disassembled and built after construction is finished.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a be used for mining of gentle slope medium thickness deposit bearing structure that slides, the curved steel guard plate of polylith forms annular steel guard shield, still is equipped with the track, is equipped with two sets of sliding support on the track, sliding support below and track sliding connection, sliding support outer lane and steel guard shield inner wall sliding connection connect through a plurality of pneumatic cylinders between two sets of sliding support, and sliding support structure is constituteed to two sets of sliding support, steel guard shield and track.
In the preferred scheme, the lower extreme of support that slides is equipped with the slider, slider and track sliding connection, and the slider both ends are equipped with a plurality of lock nut, and lock nut passes the slider and supports to lean on the track.
In the preferred scheme, a plurality of top support frames are arranged on the upper surface of the sliding support, top sliding plates are arranged at the end parts of the top support frames, and the top sliding plates abut against the inner wall of the steel shield.
In the preferred scheme, the both sides symmetry of support that slides is equipped with a plurality of side sliding plates, and side sliding plate supports and leans on the steel guard shield inner wall.
In the preferred scheme, steel guard shield inner wall is equipped with many draw runners, all is equipped with a plurality of spouts on side sliding plate and the top sliding plate, spout and draw runner sliding connection.
In the preferred scheme, a plurality of top support frames are connected through diagonal draw bars.
In the preferred scheme, steel guard shield both ends are equipped with inside bellied spacing flange, and side sliding plate and top sliding plate lean on spacing on the spacing flange spacing.
In the preferred scheme, the corner position of the sliding support is provided with a reinforcing block.
The using method comprises the following steps: s1, transporting a plurality of steel guard plates to a designated position of a medium-thickness ore deposit mining mine hole, and assembling a plurality of arc-shaped steel guard plates into an annular steel shield;
s2, assembling a sliding support in the steel shield, assembling a top support frame at the top of the sliding support, installing a top sliding plate on the top support frame, and matching the top sliding plate at the top of the sliding support with a sliding strip on the inner wall of the steel shield;
s3, side sliding plates on two sides of the sliding support are matched with sliding strips on the side wall of the steel shield;
s4, jacking the whole sliding support by using a jack, mounting a track at the bottom of the sliding support, and detaching the jack to enable the sliding support to be matched with the track;
and S5, installing at least four hydraulic cylinders between the two sliding supports to complete the assembly of the sliding support structure.
The construction method of the sliding support comprises the following steps:
a1, two sliding supports are respectively arranged at two ends of a steel shield, the front sliding support is fixed on a track by using a locking nut, and the rear sliding support and the track are in a movable state;
a2, drawing the rear sliding support to the middle part of the steel shield by using the retraction of the hydraulic cylinder, loosening the locking nut of the front sliding support, and then fixing the rear sliding support on the track by using the first locking nut;
a3, starting a hydraulic cylinder to push the front sliding support, wherein the front sliding support abuts against a limiting flange at the front end of the steel shield to form limiting, and the front sliding support pushes the whole steel shield to slide in the mine hole;
a4, pushing the sliding support in front to drive the whole steel shield to slide on the rail by the sliding support in the rear, abutting the sliding support in the rear against a limiting stop at the rear end of the steel shield, completing one-time sliding, repeating the steps for multiple times, and completing the sliding of the steel shield.
The invention provides a mining sliding support structure for a gently inclined medium-thickness ore deposit and a use method thereof.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a view showing the overall appearance of the present invention;
FIG. 2 is a bottom structure view of the steel protective barrel of the invention;
FIG. 3 is a left side sectional view of the steel casing of the present invention;
FIG. 4 is a front cross-sectional block diagram of the present invention;
FIG. 5 is a structure view of the sliding support of the present invention connected by a hydraulic cylinder;
FIG. 6 is a view showing the inner structure of the steel casing according to the present invention.
In the figure: a steel shield 1; a slide bar 101; a limiting flange 102; a slipping bracket 2; a slider 201; a reinforcing block 202; a track 3; a hydraulic cylinder 4; a top support frame 5; a top sliding plate 6; a chute 601; a diagonal member 7; a side sliding plate 8; the nut 9 is locked.
Detailed Description
As shown in a 1~6 drawing, a sliding support structure for mining of a gentle dip medium-thickness deposit and a using method thereof are provided, a plurality of arc-shaped steel protecting plates form an annular steel protecting cover 1, a rail 3 is further arranged, two groups of sliding supports 2 are arranged on the rail 3, the lower portions of the sliding supports 2 are connected with the rail 3 in a sliding mode, the outer rings of the sliding supports 2 are connected with the inner wall of the steel protecting cover 1 in a sliding mode, the two groups of sliding supports 2 are connected through a plurality of hydraulic cylinders 4, and the two groups of sliding supports 2, the steel protecting cover 1 and the rail 3 form a sliding support structure. The lower extreme of support 2 that slides is equipped with slider 201, slider 201 and track 3 sliding connection, and slider 201 both ends are equipped with a plurality of lock nut 9, and lock nut 9 passes slider 201 and supports and lean on track 3.
When in use: in order to move the whole steel shield 1 conveniently, the front sliding support is fixed on the track 3 through the first locking nut 9, the rear sliding support is pulled to the middle of the steel shield 1 through retraction of the hydraulic cylinder 4, the locking nut 9 of the front sliding support is loosened, the rear sliding support is fixed on the track 3 through the first locking nut 9, the hydraulic cylinder 4 is started to push the front sliding support, the front sliding support abuts against the limiting flange 102 at the front end of the steel shield 1 to form limiting, the rear sliding support pushes the front sliding support to drive the whole steel shield 1 to slide on the track 3, the rear sliding support abuts against the limiting flange 102 at the rear end of the steel shield 1 to complete one-time sliding, and the steps are repeated for multiple times to complete sliding of the steel shield 1.
In the preferred scheme, a plurality of top support frames 5 are arranged on the upper surface of the sliding support 2, a top sliding plate 6 is arranged at the end part of each top support frame 5, and the top sliding plates 6 abut against the inner wall of the steel shield 1. The top support frame 5 is used for supporting a plurality of top sliding plates 6, and the top sliding plates 6 are connected with the inner wall of the steel shield 1 in a sliding mode.
In the preferred scheme, 2 bilateral symmetry of support that slides is equipped with a plurality of side sliding plates 8, and side sliding plate 8 supports and leans on at 1 inner wall of steel guard shield. The side sliding plate 8 supports and slides the side wall of the steel shield 1, so that the steel shield 1 slides more uniformly and stably.
In the preferred scheme, steel guard 1 inner wall is equipped with many draw runner 101, all is equipped with a plurality of spouts 601 on side sliding plate 8 and the top sliding plate 6, spout 601 and draw runner 101 sliding connection. The sliding grooves 601 of the side sliding plate 8 and the top sliding plate 6 are slidably connected with the sliding strips 101, so that the position of the steel shield 1 can be well fixed, and the steel shield 1 can slide linearly.
In a preferred scheme, a plurality of top support frames 5 are connected through diagonal draw bars 7. The diagonal draw bars 7 reinforce the connection structure between the plurality of top support frames 5.
In a preferred scheme, two ends of the steel shield 1 are provided with limiting flanges 102 protruding inwards, and the side sliding plate 8 and the top sliding plate 6 are abutted against the limiting flanges 102 for limiting. The two sets of sliding supports 2 are abutted against the early limiting rib 102 for limiting and are also used for pushing the steel shield 1 to move by utilizing the sliding supports 2.
In a preferable scheme, a reinforcing block 202 is arranged at the corner position of the sliding bracket 2. The reinforcing block 202 reinforces the structure of the sliding support 2, so that the structure is more stable.
Example 1
As further described in connection with example 1, referring to fig. 1-6, a plurality of steel shield plates are transported to a designated location in a medium-thickness deposit mining cavity, and a plurality of curved steel shield plates are assembled into an annular steel shield 1.
The sliding support 2 is assembled inside the steel shield 1, the top support frame 5 is assembled at the top of the sliding support 2, the top sliding plate 6 is installed on the top support frame 5, and the top sliding plate 6 at the top of the sliding support 2 is matched with the sliding strip 101 on the inner wall of the steel shield 1.
The side sliding plates 8 at the two sides of the sliding support 2 are matched with the sliding strips 101 on the side wall of the steel shield 1.
The whole sliding support 2 is jacked up by using a jack, a rail 3 is arranged at the bottom of the sliding support 2, and the jack is dismounted to ensure that the sliding support 2 is matched with the rail 3.
At least four hydraulic cylinders 4 are arranged between the two sliding supports 2 to complete the assembly of the sliding support structure.
Example 2
Further described with reference to examples 1 and 2, the construction method of the sliding support with the structure shown in fig. 1-6 is as follows: two sliding supports 2 are respectively arranged at two ends of the steel shield 1, the sliding support in the front is fixed on the track 3 by utilizing a locking nut 9, and the sliding support in the rear is in a movable state with the track 3.
The hydraulic cylinder 4 is retracted to pull the rear sliding support to the middle of the steel shield 1, the locking nut 9 of the front sliding support is loosened, and then the rear sliding support is fixed on the track 3 through the locking nut 9.
And then the hydraulic cylinder 4 is started to push the front sliding support, the front sliding support abuts against a limiting flange 102 at the front end of the steel shield 1 to form limiting, and the front sliding support pushes the whole steel shield 1 to slide in the mine hole.
The rear sliding support pushes the front sliding support to drive the whole steel shield 1 to slide on the track 3, the rear sliding support abuts against the limiting flange 102 at the rear end of the steel shield 1, one-time sliding is completed, and the steps are repeated for multiple times to complete the sliding of the steel shield 1.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of this invention.
Claims (10)
1. The utility model provides a be used for mining bearing structure that slides of gentle slope medium-thickness deposit, characterized by: the multi-arc-shaped steel guard plate is formed into an annular steel guard cover (1), a track (3) is further arranged, two groups of sliding supports (2) are arranged on the track (3), the lower portions of the sliding supports (2) are connected with the track (3) in a sliding mode, the outer rings of the sliding supports (2) are connected with the inner wall of the steel guard cover (1) in a sliding mode, the two groups of sliding supports (2) are connected through a plurality of hydraulic cylinders (4), and a sliding support structure is formed by the two groups of sliding supports (2), the steel guard cover (1) and the track (3).
2. The support structure for mining glide slope of claim 1 for moderate slope medium thickness deposits, characterized by: the lower extreme of support (2) that slides is equipped with slider (201), slider (201) and track (3) sliding connection, and slider (201) both ends are equipped with a plurality of lock nut (9), and lock nut (9) pass slider (201) and lean on track (3).
3. The support structure for mining glide slope of claim 1 for moderate slope medium thickness deposits, characterized by: the upper surface of the sliding support (2) is provided with a plurality of top support frames (5), the end parts of the top support frames (5) are provided with top sliding plates (6), and the top sliding plates (6) are abutted against the inner wall of the steel shield (1).
4. A support structure for gentle slope medium thickness deposit mining slip of claim 3, characterized by: a plurality of side sliding plates (8) are symmetrically arranged on two sides of the sliding support (2), and the side sliding plates (8) are abutted against the inner wall of the steel shield (1).
5. A support structure for gentle slope medium thickness deposit mining slip of claim 3, characterized by: steel guard shield (1) inner wall is equipped with many draw runner (101), all is equipped with a plurality of spout (601) on side sliding plate (8) and top sliding plate (6), spout (601) and draw runner (101) sliding connection.
6. A support structure for gentle slope medium thickness deposit mining slip of claim 3, characterized by: the top support frames (5) are connected through diagonal draw bars (7).
7. A support structure for gentle slope medium thickness deposit mining slip of claim 3, characterized by: two ends of the steel shield (1) are provided with limiting flanges (102) protruding inwards, and the side sliding plate (8) and the top sliding plate (6) are abutted against the limiting flanges (102) for limiting.
8. A support structure for gentle slope medium thickness deposit mining slip of claim 3, characterized by: and a reinforcing block (202) is arranged at the corner position of the sliding support (2).
9. Use of a support structure for gentle dip medium thickness deposit mining skidding of any one of claims 1 to 9 wherein: the using method comprises the following steps:
s1, transporting a plurality of steel guard plates to a designated position of a medium-thickness ore deposit mining mine hole, and assembling a plurality of arc-shaped steel guard plates into an annular steel shield (1);
s2, assembling a sliding support (2) in the steel shield (1), assembling a top support frame (5) at the top of the sliding support (2), installing a top sliding plate (6) on the top support frame (5), and matching the top sliding plate (6) at the top of the sliding support (2) with a sliding strip (101) on the inner wall of the steel shield (1);
s3, side sliding plates (8) on two sides of the sliding support (2) are matched with sliding strips (101) on the side wall of the steel shield (1);
s4, jacking the whole sliding support (2) by using a jack, installing a track (3) at the bottom of the sliding support (2), and detaching the jack to enable the sliding support (2) to be matched with the track (3);
and S5, at least four hydraulic cylinders (4) are arranged between the two sliding supports (2) to complete the assembly of the sliding support structure.
10. The use of the slip support structure for gentle dip medium thickness deposit mining of claim 9, characterized by: the construction method of the sliding support comprises the following steps:
a1, two sliding supports (2) are respectively arranged at two ends of a steel shield (1), the front sliding support is fixed on a track (3) by a locking nut (9), and the rear sliding support and the track (3) are in a movable state;
a2, retracting by using a hydraulic cylinder (4) to pull the rear sliding support to the middle part of the steel shield (1), loosening a locking nut (9) of the front sliding support, and fixing the rear sliding support on the track (3) by using a first locking nut (9);
a3, starting the hydraulic cylinder (4) again to push the front sliding support, wherein the front sliding support abuts against a limiting flange (102) at the front end of the steel shield (1) to form limiting, and the front sliding support pushes the whole steel shield (1) to slide in the mine hole;
a4, pushing the sliding support in front to drive the whole steel shield (1) to slide on the track (3) by the sliding support in front, abutting the sliding support in rear against the limiting flange (102) at the rear end of the steel shield (1), completing one-time sliding, repeating the steps for multiple times, and completing the sliding of the steel shield (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210616478.1A CN115234267A (en) | 2022-06-01 | 2022-06-01 | Mining sliding support structure for gentle dip medium-thickness ore deposit and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210616478.1A CN115234267A (en) | 2022-06-01 | 2022-06-01 | Mining sliding support structure for gentle dip medium-thickness ore deposit and use method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115234267A true CN115234267A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210616478.1A Pending CN115234267A (en) | 2022-06-01 | 2022-06-01 | Mining sliding support structure for gentle dip medium-thickness ore deposit and use method thereof |
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| CN (1) | CN115234267A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117090615A (en) * | 2023-10-16 | 2023-11-21 | 中核二十五建设有限公司 | Supporting equipment for mine construction |
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| GB1532875A (en) * | 1976-06-22 | 1978-11-22 | Coal Ind | Underground roadway support equipment |
| CN108035747A (en) * | 2017-12-19 | 2018-05-15 | 张罗悦 | A kind of tunnel steel form lining trolley |
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| CN212202088U (en) * | 2020-05-12 | 2020-12-22 | 山西水利职业技术学院 | Safety protection mechanical device for tunnel engineering |
| CN212225290U (en) * | 2020-05-11 | 2020-12-25 | 欧阳志龙 | Coal mine tunneling and supporting device |
| CN113006829A (en) * | 2021-03-15 | 2021-06-22 | 中南大学 | Movable type adjustable counter-force temporary rack support system and support method for tunnel |
| CN217735537U (en) * | 2022-06-01 | 2022-11-04 | 湖北景深安全技术有限公司 | Be used for mining bearing structure that slides of gentle slope medium-thickness deposit |
-
2022
- 2022-06-01 CN CN202210616478.1A patent/CN115234267A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1532875A (en) * | 1976-06-22 | 1978-11-22 | Coal Ind | Underground roadway support equipment |
| CN108035747A (en) * | 2017-12-19 | 2018-05-15 | 张罗悦 | A kind of tunnel steel form lining trolley |
| CN208456642U (en) * | 2018-03-06 | 2019-02-01 | 唐山圣德装备制造有限公司 | Coal mine support hydraulic support |
| CN212225290U (en) * | 2020-05-11 | 2020-12-25 | 欧阳志龙 | Coal mine tunneling and supporting device |
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| CN113006829A (en) * | 2021-03-15 | 2021-06-22 | 中南大学 | Movable type adjustable counter-force temporary rack support system and support method for tunnel |
| CN217735537U (en) * | 2022-06-01 | 2022-11-04 | 湖北景深安全技术有限公司 | Be used for mining bearing structure that slides of gentle slope medium-thickness deposit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117090615A (en) * | 2023-10-16 | 2023-11-21 | 中核二十五建设有限公司 | Supporting equipment for mine construction |
| CN117090615B (en) * | 2023-10-16 | 2023-12-29 | 中核二十五建设有限公司 | Supporting equipment for mine construction |
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