CN110617080A - Narrow coal pillar anchor cable wall type reinforcing device and method - Google Patents
Narrow coal pillar anchor cable wall type reinforcing device and method Download PDFInfo
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- CN110617080A CN110617080A CN201910852181.3A CN201910852181A CN110617080A CN 110617080 A CN110617080 A CN 110617080A CN 201910852181 A CN201910852181 A CN 201910852181A CN 110617080 A CN110617080 A CN 110617080A
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- 239000003245 coal Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 238000010008 shearing Methods 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 238000004873 anchoring Methods 0.000 claims description 14
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 10
- 239000003063 flame retardant Substances 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000000979 retarding effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 230000000452 restraining effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000009423 ventilation 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
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/006—Lining anchored in the rock
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- 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
-
- 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
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- 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
- E21D21/0086—Bearing plates
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention discloses a wall type reinforcing device and method for a narrow coal pillar anchor cable, wherein the device comprises an anchor cable supporting system, an anchor cable anti-shearing system and a roadway side surface lining system; the anchor cable support system comprises an anchor cable, an anchor cable tray and an anchor cable lock; the anchor cable anti-shearing system comprises an anchor cable sleeve and grouting concrete. The roadway side surface lining system comprises a steel fiber concrete wall and a matched iron plate box mold. The anchor cable anti-shearing system consists of an anchor cable sleeve and grouting concrete; the roadway side surface lining system consists of a steel fiber concrete wall and a matched iron plate box mold; the matched iron plate box die is formed by welding steel plates with the thickness of 0.5 cm. The invention has the advantages of reasonable design, high support strength, prominent support key and simple operation process, can effectively resist the shear stress in the coal pillar, can also carry out grouting modification on the coal body of the narrow coal pillar, and has the functions of restraining the displacement of the position of the narrow coal pillar and increasing the stability of the narrow coal pillar.
Description
Technical Field
The invention relates to the technical field of roadway coal pillar support, in particular to a wall type reinforcing device and method for a narrow coal pillar anchor cable.
Background
In the underground coal mining, a section coal pillar with a certain width is required to be reserved between two adjacent working faces to ensure the requirements of working face transportation, ventilation and the like, in order to effectively save coal resources, the size of the section coal pillar is required to be reduced on the premise of ensuring safe and efficient recovery, particularly, a narrow coal pillar is reserved in gob-side entry driving or gob-side entry retaining operation and is an extremely important support body, the width of the narrow coal pillar is 4 ~ 8m, under the influence of coupling of advance bearing pressure of the adjacent recovery working face and the self weight of an overlying rock stratum, main stress is changed into inclination, the coal pillar mainly aims at shearing damage instability, so that surrounding rocks of a roadway are extremely easy to destabilize, and the safe recovery of a mine is seriously influenced.
Based on the defects of the narrow coal pillar support, the anchor cable wall type reinforcing method for the narrow coal pillar is provided. The shear strength of the anchor cable is improved by using a method of injecting concrete into the anchor cable sleeve; drilling an inclined anchor cable hole to enable the anchor cable to have the capability of resisting the inclined main stress; through the iron plate box mould of using interior notes steel fibre concrete, can effectively control tunnel surface displacement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method has the advantages of reasonable design, simple operation, modular operation, high support strength and stable support effect, and can control the plastic zone development in the narrow coal pillar and the wall caving of the surface roadway to the maximum extent.
In order to achieve the purpose, the invention provides a narrow coal pillar anchor cable wall type reinforcing device which comprises an anchor cable supporting system, an anchor cable anti-shearing system and a roadway side surface lining system; the anchor cable supporting system comprises anchor cables, anchor cable trays and anchor cable locks; the anchor cable anti-shearing system comprises an anchor cable sleeve and grouting concrete; the roadway side surface lining system comprises a steel fiber concrete wall and a matched iron plate box mold;
the method comprises the following steps that steel fiber concrete walls are poured on the surfaces of narrow coal pillars in a roadway through a matched iron plate box mold of a roadway side surface lining system, and after pouring is finished, a protection wall is formed on the surfaces of the narrow coal pillars to prevent wall caving; an insertion hole of the anchor cable support system is reserved in the steel fiber concrete wall, so that an anchor cable of the anchor cable support system is finally inserted into the narrow coal pillar through the insertion hole; one end of the anchor cable extending out of the steel fiber concrete wall is provided with an anchor cable tray and an anchor cable lock so as to protect the anchor cable;
the anchor cable is coated by the anchor cable pipe sleeve and used for enhancing the anti-shearing capacity of the anchor cable, grouting concrete is filled between the anchor cable pipe sleeve and the anchor cable, so that the anchor cable pipe sleeve, the anchor cable and the coal pillar are integrated to form a whole to prevent the anchor cable from being cut off, and an elastic core is formed in the coal pillar after the surface grouting hole is subjected to pressure grouting and is connected with the anchor cable more tightly.
The anchor cable sleeve is formed by processing a phi 40 seamless steel pipe with a plurality of grouting holes uniformly formed in the surface, the length of the sleeve is the difference between the length of the anchor cable and the length of an anchor cable anchoring section which is arranged in the narrow coal pillar and fixed with the anchor cable, and a slurry-leakage-preventing flame-retardant rubber ring with an anchor cable penetrating port in a grouting port is installed in the sleeve.
The matched iron plate box mould is formed by welding steel plates with the thickness of 0.5cm, wherein the steel plates are not welded on the contact surface of the iron plate box and the overlying rock and the contact surface of the iron plate box and the narrow coal pillar side, a grouting opening is processed at the upper part of the outer side surface, the height of the mould is the height of a roadway, the length of the mould is 20cm, and the width of the mould is 100 cm.
In order to achieve the above object, the present invention provides a wall-type reinforcing method for a narrow coal pillar anchor cable, which uses the wall-type reinforcing device for a narrow coal pillar anchor cable according to the above technical solution to reinforce the narrow coal pillar, and comprises:
embedding a stress meter in the narrow coal pillar, and actually measuring the magnitude and the direction of main stress in the coal pillar;
establishing FLAC according to overburden rock mechanical parameters measured by laboratory rock mechanical tests3DThe numerical calculation model is used for calculating the maximum main stress and direction in the coal pillar when the adjacent working faces and the working face are stoped; combining the measured value of the stress of the coal pillar to obtain the magnitude and the direction of the internal stress of the coal pillar;
according to the internal stress value-taking result of the coal pillar, drilling an anchor cable hole at an angle vertical to the main stress direction, wherein the hole diameter is 40mm, and the hole depth is three-quarters of the width of the narrow coal pillar;
placing an anchoring agent into an anchor cable anchoring section at the top of an anchor cable hole, inserting an anchor cable, crushing the anchoring agent, placing the anchor cable into an anchor cable sleeve, wherein the anchor cable penetrates out of an anchor cable hole of a flame-retardant rubber ring in the anchor cable sleeve, and the exposed length of the sleeve is 25 cm;
inserting the iron plate box mould into the narrow coal pillar side by 5cm, extending the anchor cable sleeve and the exposed anchor cable out of a preset outlet of the iron plate box mould, and sealing the preset opening and the inner section of the anchor cable sleeve mould;
adding a certain amount of waste anchor cables and cable steel wires with the length of 10cm into the concrete slurry, uniformly mixing, injecting the mixture into a mould through a mould grouting opening until the height of the internal slurry reaches the height of a roadway, and removing the mould after the steel fiber concrete is solidified;
removing the seal, injecting the mixture from a grouting hole of the flame-retardant rubber ring in the anchor cable sleeve, wherein the grouting pressure is 2.0MPa, and the grouting time is 15 min; after grouting, cutting off the exposed part of the anchor cable sleeve steel fiber retarding soil wall;
installing an anchor cable tray and an anchor cable lock, and applying prestress of 120 kN;
and circularly operating the steps at the interval of 1.5m until the roadway is completely supported.
The anchor cable direction is orthogonal to the maximum main stress in the coal pillar, so that shearing damage of the maximum main stress is effectively resisted, and stability of the narrow coal pillar is protected.
The steel fiber concrete wall is arranged on the surface of the narrow coal pillar, and the concrete wall and the narrow coal pillar form a whole through the anchor cable while the displacement of the surface of the narrow coal pillar is restrained, so that the overall performance of the narrow coal pillar is improved.
Compared with the related art, the invention has the advantages and beneficial effects that: after the main stress direction in the narrow coal pillar is clearly known, the anchor cable can effectively resist the shearing damage of the coal pillar by adjusting the angle of the anchor cable; the anchor cable sleeve is additionally arranged outside the anchor cable, and simultaneously grouting concrete is injected into the anchor cable sleeve, so that the shear strength of the anchor cable is improved, and a certain modification and enhancement effect is achieved on the inside of a coal body; the steel fiber concrete lining wall is used for effectively controlling the displacement of the surface of the roadway, so that the roadway side is prevented from being broken, meanwhile, due to the pre-tightening effect of the anchor cable, the wall body and the narrow coal pillars form a whole, the bearing performance of the coal pillars is enhanced, and the stability of the coal pillars is improved.
Drawings
FIG. 1 is a schematic view of wall-type reinforcement of a narrow coal pillar anchor cable;
FIG. 2 is a schematic view of a mold for iron plate cases;
FIG. 3 is a schematic view of an anchor cable sleeve;
reference numerals:
1-roadway roof, 2-roadway floor, 3-adjacent working face roadway, 4-this working face roadway, 5-narrow coal pillar, 6-steel fiber concrete wall, 7-anchor rope tray, 8-anchor rope lock, 9-anchor rope, 10-grouted concrete, 11-anchor rope pipe sleeve, 12-anchor rope anchoring section, 13-iron plate box mold, 14-iron plate box mold grouting opening, 15-iron plate box mold anchor rope sleeve preset outlet, 16-anchor rope sleeve internal flame retardant rubber ring, 17-rubber ring anchor rope outlet, 18-rubber ring grouting opening.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
Fig. 1 is a schematic view showing the use of the anchor cable wall type reinforcing device for narrow coal pillars provided by the present invention, in fig. 1, reference numeral 1 denotes a roadway roof, 2 denotes a roadway floor, 3 denotes an adjacent working face roadway, 4 denotes the working face roadway, and 5 denotes narrow coal pillars; the system comprises an anchor cable supporting system, an anchor cable anti-shearing system and a roadway side surface lining system; the anchor cable supporting system comprises anchor cables 9, anchor cable trays 7 and anchor cable locks 8; the anchor cable anti-shearing system comprises an anchor cable sleeve 11 and grouting concrete 10; the roadway side surface lining system comprises a steel fiber concrete wall 6 and a matched iron plate box mould 13;
the steel fiber concrete wall 6 is poured on the surface of the narrow coal pillar in the roadway through a matched iron plate box mould 13 of the roadway side surface lining system, and a protective wall is formed on the surface of the narrow coal pillar after pouring is finished to prevent the side wall from being broken; an insertion hole of the anchor cable support system is reserved in the steel fiber concrete wall 6, so that an anchor cable of the anchor cable support system is finally inserted into the narrow coal pillar through the insertion hole; an anchor cable tray 7 and an anchor cable lock 8 are arranged at one end of the anchor cable 9 extending out of the steel fiber concrete wall 6 so as to protect the anchor cable 9;
the anchor cable 9 is coated with the anchor cable sleeve 11 and used for enhancing the anti-shearing capacity of the anchor cable, grouting concrete 10 is poured between the anchor cable sleeve 11 and the anchor cable 9, so that the anchor cable sleeve 11, the anchor cable 9 and the coal pillar are integrated to form anti-shearing of the anchor cable, and an elastic core is formed in the coal pillar after the surface grouting hole is subjected to pressure grouting and is connected with the anchor cable 9 more tightly.
The anchor cable sleeve 11 is formed by processing a phi 40 seamless steel pipe with a plurality of grouting holes uniformly formed in the surface, the length of the sleeve is the difference between the length of the anchor cable 9 and the length of an anchor cable anchoring section 12 which is arranged inside the narrow coal pillar and fixed with the anchor cable 9, and a slurry-leakage-preventing flame-retardant rubber ring 16 with an anchor cable 9 penetrating through a grouting hole is arranged in the sleeve. As shown in fig. 3, 17 indicates a rubber ring anchor cable outlet, and 18 indicates a rubber ring grouting port.
The matched iron plate box mould 6 is formed by welding steel plates with the thickness of 0.5cm, wherein the steel plates are not welded on the top surface and the coal-receiving upper surface, a grouting opening is processed on the upper part of the outer upper surface, the height of the mould is the height of a roadway, the length of the mould is 20cm, and the width of the mould is 100 cm. As shown in fig. 2, 14 is the pouring nozzle of the mold for iron plate box, and 15 is the preset outlet of the anchor cable sleeve of the mold for iron plate box
In addition, the invention also provides a wall type reinforcing method of the narrow coal pillar anchor cable, the wall type reinforcing device of the narrow coal pillar anchor cable according to the technical scheme is used for reinforcing the narrow coal pillar, and the wall type reinforcing method comprises the following steps:
embedding a stress meter in the narrow coal pillar, and actually measuring the magnitude and the direction of main stress in the coal pillar;
establishing FLAC according to overburden rock mechanical parameters measured by laboratory rock mechanical tests3DThe numerical calculation model is used for calculating the maximum main stress and direction in the coal pillar when the adjacent working faces and the working face are stoped; combining the measured value of the stress of the coal pillar to obtain the magnitude and the direction of the internal stress of the coal pillar;
according to the internal stress value-taking result of the coal pillar, drilling an anchor cable hole at an angle vertical to the main stress direction, wherein the hole diameter is 40mm, and the hole depth is three-quarters of the width of the narrow coal pillar;
placing an anchoring agent into an anchor cable anchoring section 12 at the top of an anchor cable hole, inserting an anchor cable 9, stirring the anchoring agent, placing the anchor cable into an anchor cable sleeve 11, wherein the anchor cable 9 penetrates out of an anchor cable hole 17 of a flame-retardant rubber ring 16 in the anchor cable sleeve 11, and the exposed length of the sleeve is 25 cm;
inserting an iron plate box mould 13 into the narrow coal pillar side for 5cm, extending an anchor cable sleeve 11 and an exposed anchor cable 9 from a preset outlet of the iron plate box mould 13, and sealing a preset opening 15 and the inner section of the anchor cable sleeve mould;
adding a certain amount of waste anchor cables and cable steel wires with the length of 10cm into the concrete slurry, uniformly mixing, injecting the mixture into a mould through a mould grouting opening 14 until the height of the internal slurry reaches the height of a roadway, and removing the mould after the steel fiber concrete is solidified;
removing the seal, injecting the mixture from a grouting hole 18 of a flame-retardant rubber ring 16 in the anchor cable sleeve 11, wherein the grouting pressure is 2.0MPa, and the grouting time is 15 min; after grouting, cutting off the exposed part of the anchor cable sleeve steel fiber retarding soil wall;
installing an anchor cable tray 7 and an anchor cable lock 8, and applying prestress 120 kN;
and circularly operating the steps at the interval of 1.5m until the roadway is completely supported.
The anchor cable direction is orthogonal to the maximum main stress in the coal pillar, so that shearing damage of the maximum main stress is effectively resisted, and stability of the narrow coal pillar is protected.
The steel fiber concrete wall is arranged on the surface of the narrow coal pillar, and the concrete wall and the narrow coal pillar form a whole through the anchor cable while the displacement of the surface of the narrow coal pillar is restrained, so that the overall performance of the narrow coal pillar is improved.
Compared with the related art, the invention has the advantages and beneficial effects that: after the main stress direction in the narrow coal pillar is clearly known, the anchor cable can effectively resist the shearing damage of the coal pillar by adjusting the angle of the anchor cable; the anchor cable sleeve is additionally arranged outside the anchor cable, and simultaneously grouting concrete is injected into the anchor cable sleeve, so that the shear strength of the anchor cable is improved, and a certain modification and enhancement effect is achieved on the inside of a coal body; the steel fiber concrete lining wall is used for effectively controlling the displacement of the surface of the roadway, so that the roadway side is prevented from being broken, meanwhile, due to the pre-tightening effect of the anchor cable, the wall body and the narrow coal pillars form a whole, the bearing performance of the coal pillars is enhanced, and the stability of the coal pillars is improved.
The scope of the invention is not limited to the description of the method but only by the claims.
Claims (5)
1. The utility model provides a narrow coal pillar anchor rope wall formula reinforcing apparatus which characterized in that: the system comprises an anchor cable supporting system, an anchor cable anti-shearing system and a roadway side surface lining system; the anchor cable support system comprises anchor cables (9), anchor cable trays (7) and anchor cable locks (8); the anchor cable shear-proof system comprises an anchor cable sleeve (11) and grouting concrete (10); the roadway side surface lining system comprises a steel fiber concrete wall (6) and a matched iron plate box mould (13);
the method comprises the following steps that a steel fiber concrete wall (6) is poured on the surface of a narrow coal pillar in a roadway through a matched iron plate box mold (13) of a roadway side surface lining system, and a protective wall is formed on the surface of the narrow coal pillar after pouring is finished to prevent the wall caving; an insertion hole of the anchor cable support system is reserved in the steel fiber concrete wall (6), so that an anchor cable of the anchor cable support system is finally inserted into the narrow coal pillar through the insertion hole; one end of the anchor cable (9) extending out of the steel fiber concrete wall (6) is provided with an anchor cable tray (7) and an anchor cable lock (8) so as to protect the anchor cable (9);
the anchor cable sleeve (11) coats the anchor cable (9) and is used for enhancing the anti-shearing capacity of the anchor cable, grouting concrete (10) is poured between the anchor cable sleeve (11) and the anchor cable (9) to enable the anchor cable sleeve (11), the anchor cable (9) and the coal pillar to be integrated to form anti-shearing of the anchor cable, and an elastic core is formed in the coal pillar after the surface grouting hole is subjected to pressure grouting and is connected with the anchor cable (9) more tightly.
2. The narrow coal pillar anchor cable wall reinforcement of claim 1, wherein: the anchor rope sleeve pipe (11) is formed by processing a phi 40 seamless steel pipe with a plurality of grouting holes uniformly formed in the surface, the length of the sleeve pipe is the difference between the length of the anchor rope (9) and the length of an anchor rope anchoring section (12) which is arranged inside the narrow coal pillar and fixed with the anchor rope (9), and a slurry leakage prevention flame-retardant rubber ring (16) with an anchor rope (9) penetrating port at a grouting port is installed in the sleeve pipe.
3. The narrow coal pillar anchor cable wall type reinforcement device as claimed in claim 1, wherein the matched iron plate box mold (6) is welded by steel plates with thickness of 0.5cm, wherein steel plates are not welded on the contact surface of the iron plate box and the overlying rock and the contact surface of the iron plate box and the narrow coal pillar, a grouting opening is processed on the upper part of the outer upper surface, the mold height is the height of a roadway, the mold length is 20cm, and the width is 100 cm.
4. A method for wall reinforcement of narrow coal pillar anchor cables, which is carried out by using the wall reinforcement device of narrow coal pillar anchor cables according to any one of claims 1 to 3, and is characterized by comprising the following steps:
embedding a stress meter in the narrow coal pillar, and actually measuring the magnitude and the direction of main stress in the coal pillar;
establishing FLAC according to overburden rock mechanical parameters measured by laboratory rock mechanical tests3DA numerical calculation model for calculating the maximum main stress and the maximum main stress in the coal pillar when the adjacent working face and the working face are recoveredDirection; combining the measured value of the stress of the coal pillar to obtain the magnitude and the direction of the internal stress of the coal pillar;
according to the internal stress value-taking result of the coal pillar, drilling an anchor cable hole at an angle vertical to the main stress direction, wherein the hole diameter is 40mm, and the hole depth is three-quarters of the width of the narrow coal pillar;
placing an anchoring agent into an anchor cable anchoring section (12) at the top of an anchor cable hole, inserting an anchor cable (9) into the anchor cable anchoring section to stir the anchoring agent, placing the anchor cable casing (11) into the anchor cable casing, wherein the anchor cable (9) penetrates out of an anchor cable hole (17) of a flame-retardant rubber ring (16) in the anchor cable casing (11), and the exposed length of the casing is 25 cm;
inserting an iron plate box mould (13) into the narrow coal pillar side for 5cm, extending an anchor cable sleeve (11) and an exposed anchor cable (9) from a preset outlet of the iron plate box mould (13), and sealing a preset opening (15) and the inner section of the anchor cable sleeve mould;
adding a certain amount of waste anchor cables and cable steel wires with the length of 10cm into the concrete slurry, uniformly mixing, injecting the mixture into a mould through a mould grouting opening (14) until the height of the internal slurry reaches the height of a roadway, and removing the mould after the steel fiber concrete is solidified;
removing the seal, and injecting the mixture into a grouting hole (18) of a flame-retardant rubber ring (16) in the anchor cable sleeve (11), wherein the grouting pressure is 2.0MPa and the grouting time is 15 min; after grouting, cutting off the exposed part of the anchor cable sleeve steel fiber retarding soil wall;
installing an anchor cable tray (7) and an anchor cable lock (8), and applying prestress of 120 kN;
and circularly operating the steps at the interval of 1.5m until the roadway is completely supported.
5. The narrow coal pillar anchor cable wall reinforcement method as claimed in claim 4,
the narrow coal pillar anchor cable wall type reinforcement method as claimed in claim 4, wherein a steel fiber concrete wall is arranged on the surface of the narrow coal pillar, and the concrete wall and the narrow coal pillar are integrated through the anchor cable while the displacement of the surface of the narrow coal pillar is restrained, so that the overall performance of the narrow coal pillar is improved.
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| CN201910852181.3A CN110617080B (en) | 2019-09-10 | 2019-09-10 | Narrow coal pillar anchor cable wall type reinforcing device and method |
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| CN201910852181.3A CN110617080B (en) | 2019-09-10 | 2019-09-10 | Narrow coal pillar anchor cable wall type reinforcing device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112922653A (en) * | 2021-03-16 | 2021-06-08 | 太原理工大学 | Small coal pillar overlapped grouting through anchor cable |
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| CN110617080B (en) | 2020-12-29 |
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