CN112922653A - Small coal pillar overlapped grouting through anchor cable - Google Patents
Small coal pillar overlapped grouting through anchor cable Download PDFInfo
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- CN112922653A CN112922653A CN202110283240.7A CN202110283240A CN112922653A CN 112922653 A CN112922653 A CN 112922653A CN 202110283240 A CN202110283240 A CN 202110283240A CN 112922653 A CN112922653 A CN 112922653A
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- 239000003245 coal Substances 0.000 title claims abstract description 92
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- 238000004873 anchoring Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims 7
- 238000007569 slipcasting Methods 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 238000005065 mining Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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Classifications
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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
- 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
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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
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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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
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/006—Anchoring-bolts made of cables or wires
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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)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention relates to a small coal pillar overlapped grouting through anchor cable, belonging to the technical field of anchor cables for coal; comprises a main anchor cable section and a secondary anchor cable section; the main anchor cable section comprises a plurality of main steel strands, a clamping ring, an inner pipe and an outer pipe with a through hole, and a steel part with a hole is placed at the tail end of the inner pipe; the secondary anchor cable section comprises secondary steel strands, a lock catch is arranged at the end part of each primary steel strand, a lock catch is also arranged at the tail end of each secondary steel strand, and the secondary steel strands and the lock catches are mutually pulled through a specially-made steel piece to form a locking structure; the secondary anchor cable section can extend into an inner pipe of the primary anchor cable section, during work, a hole is drilled on the goaf coal pillar, the length of the hole is larger than the width of the small coal pillar, so that errors caused by roadway excavation of the lower section are prevented, the anchor cable is placed into the hole, and at the moment, the anchor cable is in a compressed state; when the lower section of the roadway is tunneled, hooking out the secondary anchor cable section, and then performing grouting and anchoring; the problem of lack the dedicated anchor rope on the little coal pillar that stays when gob entry at present is solved.
Description
Technical Field
The invention belongs to the technical field of anchor cables for coal mines, and particularly relates to a small coal pillar overlapped grouting through anchor cable.
Background
With the continuous exploitation of coal in China, the total amount of coal resources is rapidly reduced, and the improvement of the utilization rate of the coal resources is urgent. In the traditional coal mining method, the remained section coal pillars are 20-30 m, and the coal pillars are remained in the stress reduction area by adopting a gob-side entry driving method, so that the stability of the remained coal pillars can be ensured, the size of the coal pillars can be reduced, and the remained section coal pillars are only 5-8 m, thereby greatly improving the utilization rate of coal resources.
However, during roadway excavation, the small coal pillars left during gob-side entry retaining are already partially in a plastic state, pressure from a top plate cannot be borne, the small coal pillars need to be reinforced, and the small coal pillars are reinforced from two sides by adopting an overlapped grouting opposite-penetrating anchor rope. In addition, because the roadway is narrow relative to the small coal pillar, the traditional anchor cable is too long in length and inconvenient to use; when the upper section is mined generally, the lower section is not mined, and when the lower section is mined, the upper section is closed as a goaf; because the small coal pillar part enters a plastic state and needs to be subjected to grouting reinforcement, the existing anchor cable cannot meet the requirements, and therefore a novel small coal pillar overlapped grouting through anchor cable needs to be researched to reinforce the coal pillar.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a small coal pillar overlapped grouting opposite-penetrating anchor cable; the problem of lack the dedicated anchor rope on the little coal pillar that stays when gob entry at present is solved.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A small coal pillar overlapped grouting through anchor cable is arranged in an anchor cable drilling hole in an upper section, an outer pipe is arranged in the drilling hole, the anchor cable comprises a main anchor cable section and a secondary anchor cable section, and the main anchor cable section and the secondary anchor cable section are connected through a steel piece and are arranged in the outer pipe; the main anchor cable section comprises an inner pipe, the inner pipe is inserted into the outer pipe along the length direction, a plurality of main steel strands are uniformly arranged on the outer side surface of the inner pipe, and the main steel strands are arranged along the axial direction of the inner pipe and are fixed with the inner pipe through fastening rings arranged at intervals; the steel part is of a circular disc-shaped structure, a circular bulge is arranged in the center of the end face of one side of the steel part, the steel part is clamped at one end, away from a drilling orifice, of the inner pipe through the circular bulge, a plurality of main steel strand fixing holes are formed in the periphery of the edge of the steel part, a secondary steel strand fixing hole is formed in the center of the steel part, and the main steel strands penetrate through the main steel strand fixing holes and are locked through main anchor cable section lock catches; the secondary anchor cable section comprises a secondary steel strand, the secondary steel strand penetrates through the secondary steel strand fixing hole and extends into the inner pipe, a secondary anchor cable section lock catch is locked at one end of the secondary steel strand extending into the inner pipe, and the outer diameter of the secondary anchor cable section lock catch is slightly smaller than the inner diameter of the inner pipe and larger than the inner diameter of the secondary steel strand fixing hole; an anti-falling part is arranged at one end of the inner pipe, which is far away from the steel part, so that the lock catch of the secondary anchor cable section is prevented from falling off from the inner pipe; the main anchor cable section is anchored on the coal wall of the upper section through a main anchor cable section lock, a tray and a rubber sheet, the secondary anchor cable section is anchored on the coal wall of the upper section through a secondary anchor cable section lock, a tray and a rubber sheet, a through hole capable of passing through the grouting pipe needs to be drilled when the tray and the rubber sheet of the secondary anchor cable section are manufactured, the hole of the tray needs to be slightly larger than the outer diameter of the grouting pipe, and the hole of the rubber sheet is slightly smaller than the outer diameter of the grouting pipe.
Furthermore, the anchorage device also comprises a special hook cable rod, wherein the hook cable rod comprises a rod body and a hook arranged at the front end of the rod body.
Furthermore, the front end of the rod body is also provided with an illuminating lamp and a camera, the camera is in wireless connection with an external display, and the content shot by the camera can be checked in real time through the display.
Further, the length of outer tube surpasss the width of coal pillar, be provided with a plurality of via hole on the outer tube.
Furthermore, the secondary steel strands are bound together through plastic latches.
Furthermore, lubricating grease is smeared in the inner pipe of the inner pipe, so that the secondary anchor cable section lock catch can slide in the inner pipe at will.
Further, the inner pipe and the outer pipe are PVC pipes.
Furthermore, an anchor cable hook is arranged at one end, away from the secondary anchor cable section lock catch, of the secondary steel strand.
Furthermore, the method for using the small coal pillar overlapped grouting anchor cable comprises the following steps:
firstly, drilling a hole on the coal wall of an upper section by using an anchor cable drill rod, and putting an outer pipe into the drilled hole;
secondly, a main anchor cable section and a secondary anchor cable section which are connected through a steel piece are placed in the outer pipe from the drilling hole, a main steel strand penetrates through a rubber sheet and a tray of the main anchor cable section and is locked on the coal wall of the upper section by a lock of the main anchor cable section, and the whole anchor cable is in an overlapped state at the moment, namely 90% or more of the secondary steel strand of the secondary anchor cable section is positioned in the inner pipe of the main anchor cable section;
thirdly, when a small coal pillar is reserved according to construction requirements and a roadway of a lower section is excavated, the outer pipe and the coal body are cut to the width of the reserved coal pillar together, and the pipe orifice of the outer pipe is aligned with the surface of the coal wall of the lower section;
fourthly, hooking the secondary steel strand out of the inner pipe from the pipe orifice of the outer pipe of the lower section until the lock catch of the secondary anchor rope section is in close contact with the steel piece, wherein one end of the secondary steel strand, provided with the anchor rope hook, is exposed out of the pipe orifice of the outer pipe of the lower section;
fifthly, punching air holes on the coal wall of the lower section, wherein one end of each air hole is communicated with the interior of the outer pipe, and the other end of each air hole is communicated with the interior of the roadway of the lower section;
sixthly, enabling the secondary steel strand to pass through the rubber sheet and the tray of the secondary anchor cable section, locking the secondary anchor cable section on the coal wall of the lower section by a secondary anchor cable section lock for anchoring, and completely tensioning the main anchor cable section and the secondary anchor cable section in the outer pipe through the main anchor cable section lock and the secondary anchor cable section lock at the two ends;
and seventhly, inserting the grouting pipe into the outer pipe sequentially through the tray and the rubber sheet, finally inserting the grouting pipe into one end, close to the upper section, of the outer pipe, starting grouting, plugging the air holes when grout is injected into the air holes and the air holes emerge, keeping a certain pressure for more than two hours, and then cutting the grouting pipe and sealing the holes.
Compared with the prior art, the invention has the following beneficial effects:
compared with the existing small coal pillar reinforcement technology about gob-side entry retaining, the small coal pillar reinforcement technology has the advantages that the reinforcement capacity is strong, the compressive strength of the reinforced coal pillar is greatly improved, and the diffusion of dangerous gases such as gas in a goaf and the like to a mining area is also sealed through grouting; in addition, the length of the coal pillar is small, the transportation is convenient, the use is convenient, and the coal pillar is suitable for reinforcing the small coal pillars.
Drawings
The invention is described in further detail below with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of the present invention when installed on the wall of an upper coal section;
FIG. 2 is a schematic structural view of the present invention disposed on both sides of the upper and lower sections;
fig. 3 is a schematic structural view of the main anchor cable segment lock 1;
FIG. 4 is a schematic view of a secondary anchor line segment lock;
FIG. 5 is a sectional view taken along line I-I of FIG. 1;
FIG. 6 is a sectional view taken along line II-II in FIG. 2;
FIG. 7 is a schematic structural view of a hook cable bar;
wherein, 1 is a main anchor cable section lock, 2 is a tray, 3 is a rubber sheet, 4 is an outer pipe, 5 is an inner pipe, 6 is a grouting pipe, 7 is a nail, 8 is a secondary anchor cable section lock catch, 9 is a steel piece, 10 is a main anchor cable section lock catch, 11 is a fastening ring, 12 is a main steel strand, 13 is a secondary steel strand, 14 is a plastic lock catch, 15 is an air vent, 16 is a coal side, 17 is an anchor cable hook, 18 is a small coal pillar, 19 is an illuminating lamp, 20 is a camera, 21 is a hook, and 22 is a rod body.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in figures 1-7, the invention provides a small coal pillar overlapped grouting anchor cable, which is arranged in a drill hole on a small coal pillar 18, an outer pipe 4 is arranged in the drill hole, the outer diameter of the outer pipe 4 is equal to the inner diameter of the drill hole, and the length of the outer pipe 4 exceeds the width of the coal pillar to be reserved by 500 mm. And through holes are uniformly arranged on the outer tube 4.
The anchor cable is arranged inside the outer pipe 4 and is divided into two sections, namely a main anchor cable section and a secondary anchor cable section, and the main anchor cable section is connected with the secondary anchor cable section through a steel piece 9.
The main anchor cable section comprises an inner tube 5 and a main steel strand 12. The inner tube 5 is a hollow tubular structure, is arranged in the drill hole along the length direction, and is coaxial with the drill hole. The number of the main steel strands 12 is four, and the main steel strands are respectively and uniformly arranged on the periphery of the outer side surface of the inner pipe 5.
The one end that drilling drill way was kept away from to inner tube 5 is provided with ironware 9, ironware 9 is circular disc structure, and a side end face center department of being close to inner tube 5 is provided with a columniform arch, bellied external diameter equals with the internal diameter of inner tube 5, and ironware 9 keeps coaxial setting with inner tube 5, through with the arch is pegged graft in inner tube 5, realizes the reciprocal anchorage of ironware 9 and inner tube 5. Four main steel strand 12 fixing holes are uniformly formed in the periphery of the steel piece 9, and a secondary steel strand 13 fixing hole is formed in the center of the steel piece.
One ends, far away from the drilling hole openings, of the four main steel strands 12 evenly arranged on the outer side of the inner pipe 5 penetrate through four main steel strand 12 fixing holes of the steel part 9, and the exposed parts are completely locked through the main anchor cable section lock catches 10, so that the main steel strands 12 and the steel part 9 are completely fixed. Four main steel strands 12 are fixed on the outer side of the inner pipe 5 through a plurality of fastening rings 11 arranged at intervals, so that the main steel strands 12 and the inner pipe 5 are fixed with each other and cannot be separated.
The secondary anchor cable section comprises secondary steel strands 13, the secondary steel strands 13 are bundled together through plastic latches 14, and the secondary steel strands 13 penetrate through a fixing hole of the secondary steel strands 13 in the center of the steel piece 9 and extend into the inner pipe 5. The tail end of the secondary steel strand 13 in the inner pipe 5 is close to the pipe orifice of the inner pipe 5, the tail end of the secondary steel strand is locked by the secondary anchor cable section lock catch 8, the outer diameter of the secondary anchor cable section lock catch 8 is slightly smaller than the inner diameter of the inner pipe 5, and the secondary anchor cable section lock catch 8 can be just placed in the inner pipe 5.
Two nails 7 are inserted into the periphery of the outer side face of one end, far away from the steel piece 9, of the inner pipe 5, so that the secondary anchor cable section lock catch 8 and the secondary steel strand 13 can be prevented from being separated from the inner pipe 5.
Grease such as grease is coated in the inner tube of the inner tube 5, so that the secondary anchor cable segment lock catch 8 can slide in the inner tube 5 at will.
And one end of the secondary steel strand 13, which is far away from the secondary anchor cable section lock catch 8, is provided with a detachable anchor cable hook 17.
The inner pipe 5 and the outer pipe 4 are PVC pipes.
The main anchor cable section further comprises a main anchor cable section lockset 1 arranged at the drilling hole, a tray 2 and a rubber sheet 3. The rubber sheet 3 is of a circular disc-shaped structure, is arranged close to the hole opening of the drill hole and is coaxial with the drill hole; the tray 2 is arranged on the outer side of the rubber sheet 3, the rubber sheet 3 is completely covered in the tray, and the edge of the tray is tightly attached to the coal wall; the main anchor cable section lockset 1 is arranged on the end face of one side of the tray 2 far away from the rubber sheet 3. The main steel strand 12 sequentially penetrates through the rubber sheet 3 and the tray 2, is finally fixed by the main anchor cable section lock 1, and the tray 2 and the rubber sheet 3 are locked on the coal wall through the main anchor cable section lock 1; when the tray 2 and the rubber sheet 3 of the secondary anchor cable are manufactured, a through hole capable of passing through the grouting pipe 6 needs to be drilled, the hole of the tray 2 needs to be slightly larger than the outer diameter of the grouting pipe 6, and the hole of the rubber sheet 3 is slightly smaller than the outer diameter of the grouting pipe 6.
The secondary anchor cable section further comprises a secondary anchor cable section lock, a tray 2 and a rubber sheet 3, wherein the secondary anchor cable section lock is arranged on the end face of the lower section of the coal pillar.
The anchor rope still includes a dedicated hook cable pole, the hook cable pole includes the body of rod 22 and sets up in the couple 21 of the body of rod 22 front end, the body of rod 22 is columniform shaft-like structure, the front end of the body of rod 22 still is provided with light 19 and camera 20, camera 20 and external display wireless connection can look over the content that camera 20 shot in real time through the display.
The use method of the anchor cable comprises the following steps:
1. firstly, an anchor cable drill rod is utilized to drill holes on the coal wall of the upper section of the small coal pillar reserved in the gob-side entry retaining process, and after the holes are drilled, the outer pipe 4 is inserted into the drilled holes, so that the outer pipe 4 cannot be separated from the drilled holes.
2. Filling and leveling the coal wall at the hole of the drill hole inserted with the outer pipe 4 to ensure the flatness of the coal wall at the hole; then, a main anchor cable section and a secondary anchor cable section which are connected through a steel piece 9 are placed in the outer pipe 4 from the drilling hole, and a main steel strand 12 penetrates through the rubber sheet 3 and the tray 2 of the main anchor cable section and is locked on the coal wall of the upper section by a lock 1 of the main anchor cable section. At this time, the anchor cable is in an overlapped state as a whole, that is, 90% of the secondary steel strands 13 of the secondary anchor cable section are in the inner pipe 5 of the primary anchor cable section.
3. After the mining of the upper section is finished, the mining needs to be carried out on the lower section, after the roadway is excavated, the coal pillar between the upper section and the lower section is mined to the required width, at the moment, the outer pipe 4 is exposed out of the surface of the coal wall of the lower section, and the part, beyond the outer pipe 4, of the outer pipe is cut off through equipment, so that the pipe orifice of the outer pipe 4 is flush with the surface of the coal wall of the lower section.
4. Stretch into from 4 mouths of tubes of outer tube of lower section through dedicated hook cable pole, can illuminate 4 insides of outer tube through the light, the camera can transmit the inside condition of outer tube 4 to external display in real time, until the couple of hook cable pole front end and the anchor rope couple 17 of inferior steel strand wires 13 tip hang each other, then hook out inferior steel strand wires 13 from inner tube 5, until inferior anchor rope section hasp 8 and the mutual in close contact with of ironware 9, inferior steel strand wires 13 is provided with the one end of anchor rope couple 17 and exposes out in 4 mouths of tubes of outer tube of lower section.
5. And forming a vent hole 15 on the coal wall of the lower section, wherein one end of the vent hole 15 is communicated with the inside of the outer pipe 4, and the other end of the vent hole 15 is communicated with the inside of the roadway of the lower section.
6. And (3) penetrating the secondary steel strand 13 through the rubber sheet 3 and the tray 2 of the secondary anchor cable section, and locking the secondary steel strand on the coal wall of the lower section by a lockset of the secondary anchor cable section for anchoring. At the moment, the main anchor cable section and the secondary anchor cable section are completely tensioned in the outer pipe 4 through the main anchor cable section lockset 1 and the secondary anchor cable section lockset at the two ends.
7. And (3) inserting the grouting pipe 6 into the outer pipe 4 sequentially through the tray 2 and the rubber sheet 3, finally inserting the grouting pipe into one end, close to the upper section, of the outer pipe 4, starting grouting, and blocking the air holes 15 when grout is injected into the air holes 15 and the grout is blown out, and keeping a certain pressure for two hours. After two hours the slip pipe 6 was cut and sealed.
The anchor cable is used for reinforcing the small coal pillar, so that the reinforcing capability is strong for the existing small coal pillar reinforcing technology about gob-side entry retaining, the compressive strength of the reinforced coal pillar is greatly improved, and the diffusion of dangerous gases such as gas in a goaf and the like to a mining area is also sealed through grouting; in addition, the length of the coal pillar is small, the transportation is convenient, the use is convenient, and the coal pillar is suitable for reinforcing the small coal pillars.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The utility model provides a little coal pillar overlapping type slip casting is to wearing anchor rope sets up in the anchor rope drilling of upper segment section, its characterized in that: an outer pipe is arranged in the drill hole, the anchor cable comprises a main anchor cable section and a secondary anchor cable section, and the main anchor cable section and the secondary anchor cable section are connected through a steel piece and are arranged in the outer pipe;
the main anchor cable section comprises an inner pipe, the inner pipe is inserted into the outer pipe along the length direction, a plurality of main steel strands are uniformly arranged on the outer side surface of the inner pipe, and the main steel strands are arranged along the axial direction of the inner pipe and are fixed with the inner pipe through fastening rings arranged at intervals;
the steel part is of a circular disc-shaped structure, a circular bulge is arranged in the center of the end face of one side of the steel part, the steel part is clamped at one end, away from a drilling orifice, of the inner pipe through the circular bulge, a plurality of main steel strand fixing holes are formed in the periphery of the edge of the steel part, a secondary steel strand fixing hole is formed in the center of the steel part, and the main steel strands penetrate through the main steel strand fixing holes and are locked through main anchor cable section lock catches;
the secondary anchor cable section comprises a secondary steel strand, the secondary steel strand penetrates through the secondary steel strand fixing hole and extends into the inner pipe, a secondary anchor cable section lock catch is locked at one end of the secondary steel strand extending into the inner pipe, and the outer diameter of the secondary anchor cable section lock catch is slightly smaller than the inner diameter of the inner pipe and larger than the inner diameter of the secondary steel strand fixing hole;
an anti-falling part is arranged at one end of the inner pipe, which is far away from the steel part, so that the lock catch of the secondary anchor cable section is prevented from falling off from the inner pipe;
the main anchor cable section is anchored on the coal wall of the upper section through a lock of the main anchor cable section, a tray and a rubber sheet, the secondary anchor cable section is anchored on the coal wall of the upper section through a lock of the secondary anchor cable section, a tray and a rubber sheet,
when the tray and the rubber sheet of the secondary anchor cable section are manufactured, a through hole capable of passing through the grouting pipe needs to be drilled, the hole of the tray needs to be slightly larger than the outer diameter of the grouting pipe, and the hole of the rubber sheet is slightly smaller than the outer diameter of the grouting pipe.
2. The small coal pillar overlapping type grouting anchor cable for opposite penetration as claimed in claim 1, wherein: the anchorage device further comprises a special hook cable rod, and the hook cable rod comprises a rod body and a hook arranged at the front end of the rod body.
3. The small coal pillar overlapping type grouting anchor cable for opposite penetration as claimed in claim 2, wherein: the front end of the rod body is also provided with an illuminating lamp and a camera, the camera is in wireless connection with an external display, and the content shot by the camera can be checked in real time through the display.
4. The small coal pillar overlapping type grouting anchor cable for opposite penetration as claimed in claim 1, wherein: the length of outer tube surpasss the width of coal pillar, be provided with a plurality of via hole on the outer tube.
5. The small coal pillar overlapping type grouting anchor cable for opposite penetration as claimed in claim 1, wherein: the secondary steel strands are bound together through plastic latches.
6. The small coal pillar overlapping type grouting anchor cable for opposite penetration as claimed in claim 1, wherein: lubricating grease is smeared in the inner tube of the inner tube, so that the secondary anchor cable section lock catch can slide in the inner tube at will.
7. The small coal pillar overlapping type grouting anchor cable for opposite penetration as claimed in claim 1, wherein: the inner pipe and the outer pipe are PVC pipes.
8. The small coal pillar overlapping type grouting anchor cable for opposite penetration as claimed in claim 1, wherein: and an anchor cable hook is arranged at one end of the secondary steel strand, which is far away from the secondary anchor cable section lock catch.
9. The method for using the small coal pillar overlapped grouting anchor cable to penetrate through the anchor cable as claimed in claim 1, is characterized by comprising the following steps:
firstly, drilling a hole on the coal wall of an upper section by using an anchor cable drill rod, and putting an outer pipe into the drilled hole;
secondly, a main anchor cable section and a secondary anchor cable section which are connected through a steel piece are placed in the outer pipe from the drilling hole, a main steel strand penetrates through a rubber sheet and a tray of the main anchor cable section and is locked on the coal wall of the upper section by a lock of the main anchor cable section, and the whole anchor cable is in an overlapped state at the moment, namely 90% or more of the secondary steel strand of the secondary anchor cable section is positioned in the inner pipe of the main anchor cable section;
thirdly, when a small coal pillar is reserved according to construction requirements and a roadway of a lower section is excavated, the outer pipe and the coal body are cut to the width of the reserved coal pillar together, and the pipe orifice of the outer pipe is aligned with the surface of the coal wall of the lower section;
fourthly, hooking the secondary steel strand out of the inner pipe from the pipe orifice of the outer pipe of the lower section until the lock catch of the secondary anchor rope section is in close contact with the steel piece, wherein one end of the secondary steel strand, provided with the anchor rope hook, is exposed out of the pipe orifice of the outer pipe of the lower section;
fifthly, punching air holes on the coal wall of the lower section, wherein one end of each air hole is communicated with the interior of the outer pipe, and the other end of each air hole is communicated with the interior of the roadway of the lower section;
sixthly, enabling the secondary steel strand to pass through the rubber sheet and the tray of the secondary anchor cable section, locking the secondary anchor cable section on the coal wall of the lower section by a secondary anchor cable section lock for anchoring, and completely tensioning the main anchor cable section and the secondary anchor cable section in the outer pipe through the main anchor cable section lock and the secondary anchor cable section lock at the two ends;
and seventhly, inserting the grouting pipe into the outer pipe sequentially through the tray and the rubber sheet, finally inserting the grouting pipe into one end, close to the upper section, of the outer pipe, starting grouting, plugging the air holes when grout is injected into the air holes and the air holes emerge, keeping a certain pressure for more than two hours, and then cutting the grouting pipe and sealing the holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283240.7A CN112922653B (en) | 2021-03-16 | 2021-03-16 | Small coal pillar overlapped grouting through anchor cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283240.7A CN112922653B (en) | 2021-03-16 | 2021-03-16 | Small coal pillar overlapped grouting through anchor cable |
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| Publication Number | Publication Date |
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| CN112922653A true CN112922653A (en) | 2021-06-08 |
| CN112922653B CN112922653B (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110283240.7A Active CN112922653B (en) | 2021-03-16 | 2021-03-16 | Small coal pillar overlapped grouting through anchor cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542148A (en) * | 2022-04-24 | 2022-05-27 | 应急管理部国家自然灾害防治研究院 | Grouting support anchor cable equipment for impacting water diversion tunnel by running ice in cold and dry areas |
| CN114542149A (en) * | 2022-04-27 | 2022-05-27 | 中国矿业大学 | Underground roadway rock burst prevention supporting anchor cable |
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