CN114934793B - T-shaped opposite-pulling anchor cable for large-deformation high-constant-resistance temporary-void small coal pillar - Google Patents
T-shaped opposite-pulling anchor cable for large-deformation high-constant-resistance temporary-void small coal pillar Download PDFInfo
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- CN114934793B CN114934793B CN202210607952.4A CN202210607952A CN114934793B CN 114934793 B CN114934793 B CN 114934793B CN 202210607952 A CN202210607952 A CN 202210607952A CN 114934793 B CN114934793 B CN 114934793B
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- 239000003245 coal Substances 0.000 title claims abstract description 82
- 239000011800 void material Substances 0.000 title claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000009933 burial Methods 0.000 claims description 13
- 230000006378 damage Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 101150006573 PAN1 gene Proteins 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a large-deformation high-constant-resistance temporary small coal pillar T-shaped opposite-pulling anchor rope which is arranged on a small coal pillar and comprises a T-shaped fixed disc, a high resistor, a round table pull head, steel strands, a tray and a nut, wherein the small coal pillar is provided with a through hole, the high resistor is arranged in the through hole in a penetrating manner, the rear end of the T-shaped fixed disc extends into the through hole from the front end of the small coal pillar, the rear end of the T-shaped fixed disc is connected to the front end of the high resistor, the round table pull head is embedded in the high resistor, the front end of the steel strands is connected to the rear end of the round table pull head, and the T-shaped fixed disc and the tray are respectively pressed on the front end face and the rear end face of the small coal pillar through the steel strands and the nut. The middle-high resistor can not only enable the round bench pull head to always receive high constant resistance in the sliding process, but also provide enough sliding quantity for the round bench pull head, so that the large deformation of the small coal pillar can be self-adapted, and further the functions of actively yielding, then controlling the damage and instability of the temporary small coal pillar under the working conditions of pre-digging two lanes with high strength and large deformation can be realized.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a T-shaped opposite-pulling anchor cable for a large-deformation high-constant-resistance temporary small coal pillar.
Background
In order to avoid mutual interference of adjacent working surfaces, coal pillars with certain width are generally reserved for isolating adjacent goafs. However, the setting up of wide coal pillar will cause the mine resource waste, reduce the service life of mine. In order to reduce coal loss and improve recovery rate, scholars at home and abroad propose a small coal pillar exploitation technology. The small coal pillar mining technology greatly reduces the sizes of the protection coal pillars of the adjacent working surfaces, improves the resource recovery rate, and is easy to maintain because the roadway is positioned in the surrounding rock stress reduction area, so that the method is widely adopted. However, in the small coal pillar mining technology, when the problem of the shortage of working face replacement is solved by adopting a pre-digging two-lane mode, the temporary coal pillar of the working face is affected by two mining operations, large deformation of the coal pillar occurs, and then the phenomenon of damage and instability occurs.
In order to control the damage instability of the temporary coal pillar under the pre-digging two lanes, opposite-pulling anchor cables are generally arranged in the coal pillar, however, the traditional opposite-pulling anchor cables adopted at present have small deformation, are difficult to adapt to the deformation of the temporary coal pillar which is disturbed for many times under the whole mining period, and have the defects of breakage of the opposite-pulling anchor cables and even splash injury accidents.
Disclosure of Invention
In view of the above, the invention provides a T-shaped opposite-pulling anchor cable for a large-deformation high-constant-resistance temporary small coal pillar, and aims to solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
A big high constant resistance face empty little coal column T type to drawing anchor rope of warp sets up on little coal column, includes: the T-shaped fixing disc, the high resistor, the round bench pull head, the steel stranded wires, the tray and the nut; the small coal pillar is provided with a through hole; the high resistor is arranged in the through hole in a penetrating way; the rear end of the T-shaped fixing disc extends into the through hole from the front end of the small coal pillar, and the rear end of the T-shaped fixing disc is connected with the front end of the high resistor; the round bench pull head is embedded in the high resistor; the front end of the steel strand is connected to the rear end of the round bench pull head; the T-shaped fixing disc and the tray are respectively pressed on the front end face and the rear end face of the small coal pillar through the steel stranded wires and the nuts.
Preferably, the rear end of the steel strand is provided with an external thread part; the nut is in threaded connection with the external thread part; the front end of the nut is abutted to the rear end of the tray.
Preferably, the length L of the high resistor is related to the vertical stress σ y of the small coal pillar and the width L 1 of the small coal pillar: when 0< sigma y is less than or equal to 15MPa, L is (0.3-0.4) L 1; when 15MPa < sigma y is less than or equal to 30MPa, L is 0.45L 1; when σ y >30MPa, L is 0.5L 1.
Preferably, the diameter d 2 of the rear end of the T-shaped fixing plate is related to the inner diameter d of the high resistor and the sidewall thickness h 0: d 2＝0.6(d+h0).
Preferably, the front end thickness L 0 of the high resistor is related to the pretightening force F of the large-deformation high-constant-resistance temporary-air small coal pillar T-shaped opposite-pulling anchor cable: l 0≥3Fh/40F0, where h=1 mm, f 0 =1 kN.
Preferably, the inner diameter d of the high resistor is related to the burial depth of the small coal pillar 7 and the width L 1 of the small coal pillar: d=22 mm when the burial depth of the small coal pillar is >500m, or L 1 >12 m; d=17.8 mm when the burial depth of the small coal pillar is less than or equal to 500m,0< L 1 is less than or equal to 7.5 m; d=19 mm when the burial depth of the small coal pillar is less than or equal to 500m, and 7.5m < L 1 is less than or equal to 12 m.
Preferably, the sidewall thickness h 0 of the high-resistor is related to the left end thickness L 0 of the high-resistor: h 0≥0.5L0.
Preferably, the diameter d 1 of the front end of the round bench slider is related to the inner diameter d of the high resistor: d 1 is more than or equal to 1.3d.
Preferably, the included angle alpha of the rear end of the round bench pull head=105° to 120 °.
Compared with the prior art, the invention has the following technical effects: the invention forms the paired anchor cable by arranging the T-shaped fixed disc, the high resistor, the round bench pull head, the steel stranded wires, the tray, the nut and other parts, the anchor cable can actively adjust the tension of the anchor cable through the nut, meanwhile, when the small coal pillar is greatly deformed under the influence of mining, the round bench pull head slides relative to the high resistor under the action of the tension of the steel stranded wires, at the moment, the high resistor not only can ensure that the round bench pull head always receives high constant resistance in the sliding process, but also can provide enough sliding quantity for the round bench pull head, thereby being capable of self-adapting to the large deformation of the small coal pillar, further realizing the function of actively yielding, then controlling the temporary small coal pillar to be damaged and unstably under the working condition of pre-digging two lanes with high strength and large deformation, and being suitable for the temporary small coal pillar deformation of repeated disturbance under the whole mining period, and effectively avoiding the occurrence of fracture and splashing injury accidents of the paired anchor cable.
Drawings
FIG. 1 is a schematic structural view of a T-shaped opposite-pulling anchor cable for a large-deformation high-constant-resistance temporary small coal pillar;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
In the figure: 1. a T-shaped fixed disc; 2. gao Zuqi; 3. round bench pull head; 4. steel strand; 5. a tray; 6. a nut; 7. a small coal pillar; 8. a through hole; 9. an inner cavity.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Examples
Referring to fig. 1-2, the invention discloses a large-deformation high-constant-resistance temporary-empty small coal pillar T-shaped opposite-pulling anchor cable which is arranged on a small coal pillar 7 and comprises the following components: the T-shaped fixing plate 1, the high resistor 2, the round bench pull head 3, the steel stranded wires 4, the tray 5 and the nut 6; the small coal pillar 7 is provided with a through hole 8; the high resistor 2 is arranged in the through hole 8 in a penetrating way; the rear end of the T-shaped fixed disc 1 extends into the through hole 8 from the front end of the small coal pillar 7; the rear end of the T-shaped fixed disc 1 is fixedly connected to the front end of the high resistor 2 in a welding mode; the high resistor 2 is of a cylindrical structure, the rear end face of the high resistor 2 is inwards recessed, and an inner cavity 9 is formed in the high resistor 2; the round bench pull head 3 is embedded in the inner cavity 9; the T-shaped opposite-pull anchor cable can keep high constant resistance by utilizing the friction force generated by relative sliding between the round bench pull head 3 and the surface of the inner cavity 9 of the high resistor 2, so as to adapt to the deformation of a small coal pillar; the front end of the steel strand 4 is connected with the rear end of the round bench pull head 3; the front end face of the tray 5 is attached to the rear end face of the small coal pillar 7; the T-shaped fixing disc 1 and the tray 5 are respectively pressed on the front end face and the rear end face of the small coal pillar 7 through the steel stranded wires 4 and the nuts 6.
In the present embodiment, the rear end of the steel strand 4 is provided with an external thread portion; the nut 6 is connected with the external thread part in a threaded manner; the internal thread hole of the nut 6 is screwed into the external thread part at the rear end of the steel strand 4, and the front end of the nut 6 is abutted against the rear end of the tray 5, so that the T-shaped fixing disc 1 and the tray 5 are respectively clung to the front end face and the rear end face of the small coal pillar 7.
In the embodiment, the T-shaped fixed disc 1 consists of a disc and a connecting column vertically arranged at the rear end of the disc part; the rear end of the connecting column of the T-shaped fixed disc 1 is connected with the front end of the high resistor 2; the rear end face of the disk of the T-shaped fixed disk 1 is tightly attached to the front end face of the small coal pillar 7.
In this embodiment, the opening end of the inner cavity 9 is provided with a limiting boss for limiting the displacement of the round bench slider 3 and preventing the round bench slider 3 from being separated from the high resistor 2.
In the present embodiment, the length L of the high resistor 2 is related to the vertical stress σ y of the small coal pillar 7 and the width L 1 of the small coal pillar 7: when 0< sigma y is less than or equal to 15MPa, L is (0.3-0.4) L 1; when 15MPa < sigma y is less than or equal to 30MPa, L is 0.45L 1; when σ y >30MPa, L is 0.5L 1.
In this embodiment, the diameter d 2 of the rear end of the T-shaped holding pan 1 is related to the diameter d of the inner cavity 9 and the sidewall thickness h 0: d 2＝0.6(d+h0).
In this embodiment, the front end thickness L 0 of the high resistor 2 is related to the pretightening force F of the large-deformation high-constant-resistance temporary small coal pillar T-shaped opposite-pulling anchor cable: l 0≥3Fh/40F0, where h=1 mm, f 0 =1 kN, and f is in kN.
In this embodiment, the diameter d of the cavity 9 is related to the burial depth of the small coal pillar 7 and the width L 1 of the small coal pillar 7: d=22 mm when the burial depth of the small coal pillar 7 is >500m, or L 1 >12 m; d=17.8 mm when the burial depth of the small coal pillar 7 is less than or equal to 500m,0< L 1 is less than or equal to 7.5 m; d=19 mm when the burial depth of the small coal pillar 7 is less than or equal to 500m, and 7.5m < L 1 is less than or equal to 12 m.
In the present embodiment, the sidewall thickness h 0 of the high-resistor 2 is related to the left end thickness L 0 of the high-resistor 2: h 0≥0.5L0.
In this embodiment, the diameter d 1 of the front end of the round bench slider 3 is related to the diameter d of the inner cavity 9: d 1 is more than or equal to 1.3d.
In this embodiment, the included angle α=105° to 120 ° at the rear end of the round bench slider 3.
As an embodiment of the invention, when the vertical stress sigma y of the small coal pillar 7 is 10MPa, the width L 1 of the small coal pillar 7 is 6m, the burial depth of the small coal pillar 7 is 420m, the pretightening force F of the large-deformation high-constant-resistance temporary-air small coal pillar T-shaped opposite-pulling anchor cable is 200kN, the length L of the high resistor 2 is (1.8-2.4) m, preferably L is 2.4m; the diameter d of the lumen 9 is = 17.8mm; the diameter d 1 of the front end of the round bench slider 3 is more than or equal to 1.3d=23.14 mm, preferably d 1 =24 mm; the front end thickness L 0≥3Fh/40F0 = 15mm, preferably L 0 = 15mm, of the high resistor 2; the sidewall thickness h 0≥0.5L0 = 7.5mm, preferably h 0 = 7.5mm, of the high resistor 2; diameter d 2＝0.6(d+h0 of the rear end of the T-shaped fixed disk 1) =15.18 mm; preferably, the rear end included angle α=110° of the round table slider 3.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present invention still fall within the scope of the technical solutions of the present invention.
Claims (6)
1. The utility model provides a big high constant resistance face empty little coal column T type to drawing anchor rope of warp, sets up on little coal column (7), its characterized in that includes: the T-shaped fixing disc (1), a high resistor (2), a round bench pull head (3), steel strands (4), a tray (5) and a nut (6); a through hole (8) is arranged on the small coal pillar (7); the Gao Zuqi (2) is arranged in the through hole (8) in a penetrating way; the rear end of the T-shaped fixing disc (1) extends into the through hole (8) from the front end of the small coal pillar (7), and the rear end of the T-shaped fixing disc is connected with the front end of the Gao Zuqi (2); the round bench pull head (3) is embedded in the Gao Zuqi (2); the front end of the steel strand (4) is connected to the rear end of the round bench pull head (3); the T-shaped fixing disc (1) and the tray (5) are respectively pressed on the front end face and the rear end face of the small coal pillar (7) through the steel stranded wires (4) and the nuts (6);
The length L of Gao Zuqi (2) is related to the vertical stress σ y of the small coal pillar (7) and the width L 1 of the small coal pillar (7): when 0< sigma y is less than or equal to 15MPa, L is (0.3-0.4) L 1; when 15MPa < sigma y is less than or equal to 30MPa, L is 0.45L 1; when σ y >30MPa, L is 0.5L 1;
The front end thickness L 0 of Gao Zuqi (2) is related to the pretightening force F of the T-shaped opposite-pulling anchor cable of the large-deformation high-constant-resistance temporary-air small coal pillar: l 0≥3Fh/40F0, where h=1 mm, f 0 =1 kN;
The inner diameter d of Gao Zuqi (2) is related to the burial depth of the small coal pillar (7) and the width L 1 of the small coal pillar (7): d=22 mm when the burial depth of the small coal pillar (7) is >500m, or L 1 >12 m; d=17.8 mm when the burial depth of the small coal pillar (7) is less than or equal to 500m,0< L 1 is less than or equal to 7.5 m; d=19 mm when the burial depth of the small coal pillar (7) is less than or equal to 500m, and 7.5m < L 1 is less than or equal to 12 m.
2. The T-shaped opposite-pulling anchor cable for the large-deformation high-constant-resistance temporary small coal pillar is characterized in that the rear end of the steel strand (4) is provided with an external thread part; the nut (6) is connected with the external thread part in a threaded manner; the front end of the nut (6) is abutted against the rear end of the tray (5).
3. The large-deformation high-constant-resistance temporary-void small coal pillar T-shaped opposite-pulling anchor cable according to claim 1, wherein the diameter d 2 of the rear end of the T-shaped fixed disc (1) is related to the inner diameter d and the side wall thickness h 0 of Gao Zuqi (2): d 2=0.6（d+h0).
4. The large-deformation high-constant-resistance temporary small coal pillar T-shaped opposite-pulling anchor cable according to claim 1, wherein the sidewall thickness h 0 of Gao Zuqi (2) is related to the left end thickness L 0 of Gao Zuqi (2): h 0≥0.5L0.
5. The large-deformation high-constant-resistance temporary-void small coal pillar T-shaped opposite-pulling anchor cable according to claim 1, wherein the diameter d 1 of the front end of the round bench slider (3) is related to the inner diameter d of Gao Zuqi (2): d 1 is more than or equal to 1.3d.
6. The T-shaped opposite-pulling anchor cable for the large-deformation high-constant-resistance temporary small coal pillar is characterized in that an included angle alpha=105-120 DEG at the rear end of the round bench slider (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607952.4A CN114934793B (en) | 2022-05-31 | 2022-05-31 | T-shaped opposite-pulling anchor cable for large-deformation high-constant-resistance temporary-void small coal pillar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607952.4A CN114934793B (en) | 2022-05-31 | 2022-05-31 | T-shaped opposite-pulling anchor cable for large-deformation high-constant-resistance temporary-void small coal pillar |
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| CN114934793A CN114934793A (en) | 2022-08-23 |
| CN114934793B true CN114934793B (en) | 2024-09-24 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626111A (en) * | 2015-12-25 | 2016-06-01 | 山东深博巷道支护技术有限公司 | Telescopic two-ended anchor cable for two-direction reinforcing of coal pillar |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU761231B2 (en) * | 1999-04-23 | 2003-05-29 | Minova Australia Pty Limited | Method and apparatus for forming rock anchor |
| CN2687211Y (en) * | 2003-12-08 | 2005-03-23 | 重庆大学 | Anchouing device capable of producing plastic deformation |
| CA2713724C (en) * | 2008-01-28 | 2016-11-22 | Darin R. Kruse | Apparatus and methods for underground structures and construction thereof |
| CN102174812B (en) * | 2011-03-08 | 2012-10-17 | 中国科学院武汉岩土力学研究所 | Active self-adaptative constant-resistance lengthener for prestress anchor cable |
| CN204200254U (en) * | 2014-10-31 | 2015-03-11 | 济南深博矿山设备有限公司 | A kind of coal column is reinforced and is used two-way two-ended cables |
| CN205117377U (en) * | 2015-10-20 | 2016-03-30 | 山东科技大学 | Gob entry driving fender is consolidated and is used slip casting anchor rope |
| CN106907170B (en) * | 2017-04-29 | 2023-03-03 | 陕西省建筑职工大学 | Roadway bottom plate supporting structure and construction method |
| CN107387141B (en) * | 2017-09-12 | 2020-05-19 | 中国矿业大学 | Self-drilling type differential grouting combined anchor rod and anchoring method thereof |
| CN208473911U (en) * | 2018-05-24 | 2019-02-05 | 中煤能源研究院有限责任公司 | It is a kind of reinforce coal column allow pressure large deformation to draw anchor cable |
| CN110617080B (en) * | 2019-09-10 | 2020-12-29 | 太原理工大学 | Narrow coal pillar anchor cable wall type reinforcing device and method |
| CN113153435B (en) * | 2021-05-17 | 2022-07-01 | 中国矿业大学 | Method for determining coal pillar reinforcement parameters under double-roadway arrangement system re-mining disturbance |
| CN113653520B (en) * | 2021-08-17 | 2024-08-23 | 李学彬 | Opposite-pulling yielding grouting anchor cable and supporting method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626111A (en) * | 2015-12-25 | 2016-06-01 | 山东深博巷道支护技术有限公司 | Telescopic two-ended anchor cable for two-direction reinforcing of coal pillar |
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