CN109578036B - Grouting anchor cable for completely filling loose bodies and filling method - Google Patents
Grouting anchor cable for completely filling loose bodies and filling method Download PDFInfo
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- CN109578036B CN109578036B CN201811342636.9A CN201811342636A CN109578036B CN 109578036 B CN109578036 B CN 109578036B CN 201811342636 A CN201811342636 A CN 201811342636A CN 109578036 B CN109578036 B CN 109578036B
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- grouting
- filling
- footage
- grouting anchor
- anchor cable
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
Abstract
The invention provides a grouting anchor cable for completely filling loose bodies, which solves the technical problems of low filling rate and difficult permanent support faced by loose body filling in the prior art, and is provided with a cable body, wherein a grouting core tube and a grout outlet are arranged in the cable body, the grout outlet is arranged on the grouting core tube, a plurality of steel strands are wound on the periphery of the grouting core tube, the steel strands uniformly and tightly surround the grouting core tube in a spiral shape, the length of the grouting core tube is the length of the grouting anchor cable, two ends of the cable body are respectively provided with a thread and a thread connecting nut, and a plurality of grouting anchor cables can be connected together through the thread and the thread connecting nut; the invention also provides a filling method applying the grouting anchor cable. The grouting anchor cable is simple in structure, convenient to operate, good in supporting effect and good in application prospect; the filling method can strengthen the loose objects, can improve the deformation resistance of the loose objects and can adapt to different roof conditions.
Description
Technical Field
The invention belongs to the technical field of goaf treatment, relates to a goaf filling method, and particularly relates to a grouting anchor cable and a filling method for completely filling loose bodies.
Background
Along with the progress of coal mining technology, the treatment methods of the coal mine goaf are more and more. However, the goaf filling technology is still the most effective method for managing the goaf at the present stage. However, the use of goaf filling sometimes also increases mining costs for the coal mine because goaf filling requires a suitable filling material, which can increase dramatically if the vicinity of the coal mine lacks a suitable filling material. The method is limited by filling cost and the shortage of filling materials, and the filling of solid materials such as loose objects or various building wastes becomes a new method for treating the goaf. However, the popularization and use of loose body filling face the bottleneck of insufficient filling rate and difficult permanent support, if the roof plate condition is not good, the loose body is difficult to fill in time, and the cementing power of the loose body can be enhanced by adopting grouting, so that the effect of strengthening the loose body is achieved.
Disclosure of Invention
The invention aims to overcome the technical problems of low filling rate and difficult permanent support in loose body filling in the prior art, and provides a grouting anchor cable and a filling method for completely filling loose bodies, which can be used for grouting and reinforcing the loose bodies, can greatly improve the deformation resistance of the loose bodies, and are suitable for different roof conditions.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a slip casting anchor rope for loose body is whole to be filled, it is equipped with the cable body, internal slip casting core pipe and the grout outlet of being equipped with of cable, the grout outlet sets up on the slip casting core pipe, slip casting core pipe periphery winding has many steel strands, steel strand is with the even inseparable around the slip casting core pipe of heliciform, the length of slip casting core pipe is the length of slip casting anchor rope promptly, the length of slip casting anchor rope is longer 0.3m than the size that fills the footage, cable body both ends are equipped with screw thread and threaded connection nut respectively, a plurality of slip casting anchor ropes accessible screw thread and threaded connection nut link together.
Preferably, the plurality of slurry outlets are spaced at a distance of 1 m.
Preferably, the end part of the cable body is provided with a grouting opening, and the grouting core pipe is communicated with the grouting opening.
A filling method using the grouting anchor cable is provided, when the roof surrounding rock conditions are in I-type stable surrounding rock conditions or II-type relatively stable surrounding rock conditions, the roof conditions are good, and the filling method comprises the following steps:
1) the first filling footage filling goaf: the coal seam is mined in an upward-going mode, wherein the fully-mechanized mining support occupies 4m, and then a goaf is filled with loose materials such as construction waste, coal mine waste rock and the like, and the filling footage of the goaf is 4 m;
2) laying a first filling footage grouting anchor rope: a layer of grouting anchor cables without grouting ports are laid close to the top plate, the horizontal distance between the grouting anchor cables is 1m, the threaded connection end of the grouting anchor cable exceeds 0.3m, and the grouting anchor cables are convenient to connect;
3) and a second filling footage goaf: continuously mining the coal seam 8m in an upward-going mode, and mining 16m in total, wherein the fully mechanized coal mining support accounts for 4m, and filling is not carried out in the step;
4) laying a second filling footage grouting anchor rope: the second filling footage grouting anchor cable is connected with the first filling footage grouting anchor cable through a screw thread and a screw thread connecting nut, the other end of the second filling footage grouting anchor cable is temporarily fixed on the top plate, the horizontal distance between the grouting anchor cables is 1m, and the screw thread connecting end of the grouting anchor cable exceeds the second filling footage by 0.3m so as to be convenient for connection of the grouting anchor cables;
5) and (3) filling a gob by a third filling footage: continuously mining 8m of the coal seam in an upward-going mode, mining 24m in total, filling a fully mechanized mining support accounting for 4m of the coal seam, and filling a goaf by using loose materials such as construction waste, coal mine waste rock and the like, wherein the filling footage of the goaf is 8 m;
6) laying a third filling footage grouting anchor rope: the third filling footage grouting anchor cable is in threaded connection with the second filling footage grouting anchor cable, a layer of grouting anchor cable with a grouting opening is laid close to the top plate, the horizontal distance between the grouting anchor cables is 1m, and the grouting end of the grouting anchor cable exceeds 0.3m, so that grouting is facilitated;
7) grouting: communicating a grouting opening of the grouting anchor cable with a grouting pump, grouting into the grouting core pipe through the grouting pump, enabling the grout to diffuse from the middle part to the periphery of the loose body, and cementing the loose body into a whole after the grout is solidified;
8) and (4) repeating the steps 1) to 7), wherein the first filling footage is filled into the goaf, the ascending mining coal seam is 8m, the goaf is filled with loose materials such as construction waste, coal mine waste rock and the like, the filling footage of the goaf is 8m, and the goaf is filled completely until the coal seam is completely mined.
When the roof surrounding rock conditions are stable surrounding rocks, unstable surrounding rocks or extremely unstable surrounding rocks in III-V class and the like, the roof conditions are poor, and the filling method comprises the following steps:
1) non-filling mining: 8m of coal seam is mined in an upward-going mode, the fully-mechanized coal mining support occupies 4m, and filling is not performed at the moment;
2) filling and mining: continuously mining the coal bed in an upward mode for 4m, and filling the goaf for 4m with loose materials such as construction waste, coal mine gangue and the like;
3) laying a grouting anchor cable: laying a layer of grouting anchor cables with grouting ports close to the top plate, wherein the horizontal distance between the grouting anchor cables is 1m, and the grouting end exceeds 0.3m so as to facilitate grouting;
4) grouting: communicating a grouting opening of the grouting anchor cable with a grouting pump, grouting into the grouting core pipe through the grouting pump, filling gaps among the loose bodies with the grout, and cementing the loose bodies into a whole after the grout is solidified;
5) and (4) repeating the steps 1) to 4), wherein the filling mining is not carried out, the coal seam is mined in an upward-going mode for 4m until the coal seam is completely mined, and the goaf is completely filled.
The grouting anchor cable is simple in structure, low in cost, convenient to operate, good in supporting effect and good in application prospect. The loose bodies are not required to be broken into small particle sizes to ensure the filling effect, the loose bodies can be reinforced by slurry grouting, a solution is provided for replacing and mining stagnant coal resources by building wastes, gangue and the like when the ground building protection level is higher or a top plate aquifer exists, and the overall filling efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a grouting anchor cable in the invention;
FIG. 2 is a cross-sectional view of the cross-section A-A of FIG. 1 according to the present invention;
FIG. 3 is a schematic view of the primary face mining 8m under the best roof conditions in the present invention;
FIG. 4 is a schematic view of grouting anchor cables laid on a working face under the condition of good roof condition in the invention;
FIG. 5 is a schematic illustration of a 16m roof condition mining operation according to the present invention;
FIG. 6 is a schematic illustration of a 24m roof condition of the present invention;
FIG. 7 is a schematic illustration of the slurry injection under the top plate condition of the present invention;
FIG. 8 is a schematic illustration of the invention without cut-and-fill mining for conditions of poor roof conditions 8 m;
FIG. 9 is a schematic illustration of a 12m roof condition of the present invention under poor roof conditions;
FIG. 10 is a schematic view of anchor cable filling and anchor cable laying under poor roof conditions in accordance with the present invention;
FIG. 11 is a schematic illustration of the present invention in which the top plate is poorly conditioned.
The symbols in the figures indicate:
1. a cable body; 2. a grouting port; 3. grouting a core pipe; 4. a pulp outlet; 5. steel strand wires; 6. a thread; 7. the nut is connected by screw thread.
Detailed Description
The invention is further described below in conjunction with the drawings and the specific embodiments to assist in understanding the contents of the invention. The terms used in the present invention are all terms that are conventional in the industry, unless otherwise specified. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
As shown in fig. 1 and 2, the grouting anchor cable for filling loose bodies completely provided by the invention comprises a cable body 1, a grouting core tube 3 and a grout outlet 4 are arranged in the cable body 1, and the grout outlet 4 is arranged on the grouting core tube 3. A plurality of steel strands 5 are wound on the periphery of the grouting core pipe 3, and the steel strands 5 uniformly and tightly surround the grouting core pipe 3 in a spiral shape; the length of the grouting core pipe 3 is the length of the grouting anchor cable, and the length of the grouting anchor cable is 0.3m longer than the size of the filling footage. The end part of the cable body 1 is provided with a grouting opening 2, a grouting core tube 3 is communicated with the grouting opening 2, the interval distance between a plurality of grout outlets 4 on the grouting core tube 3 is 1m, grout is injected into the loose body from the grout outlets 4, and the loose body is cemented into a whole after the grout is solidified.
Both ends of the cable body 1 are respectively provided with a thread 6 and a thread connecting nut 7, and a plurality of grouting anchor cables can be connected together through the thread 6 and the thread connecting nut 7. The grouting anchor cable comprises two types, namely a grouting anchor cable without a grouting opening 2 and a grouting anchor cable with a grouting opening 2, which can be connected through a thread 6, wherein the grouting anchor cable without the grouting opening 2 and the grouting anchor cable with the grouting opening 2 can be connected through the thread 6, and the only difference between the grouting anchor cable without the grouting opening 2 and the grouting anchor cable with the grouting opening 2 is that the grouting opening 2 is arranged at the end part of the cable body 1.
The invention also provides a filling method using the grouting anchor cable.
Example one
When the roof surrounding rock condition is in the condition of I-type stable surrounding rock or II-type relatively stable surrounding rock, the roof condition is good, and the filling method comprises the following steps:
1) the first filling footage filling goaf: as shown in figure 3, an upstroke coal seam is mined by 8m, a fully mechanized support occupies a space of 4m, and then a goaf is filled with loose materials such as construction waste and coal mine gangue, the filling footage of the goaf is 4m, so that large loose objects are ensured to be on two sides as much as possible, and small particles are arranged inside, and self-stabilization and later-stage anchoring are facilitated.
2) Laying a first filling footage grouting anchor rope: as shown in figure 4, a layer of grouting anchor cable without a grouting opening is laid close to the top plate, the horizontal distance of the grouting anchor cable is 1m, the threaded connection end of the grouting anchor cable exceeds 0.3m, and the grouting anchor cable is convenient to connect.
3) And a second filling footage goaf: as shown in fig. 5, the coal seam 8m is continuously mined upwards for a total of 16m, wherein the fully mechanized coal mining support occupies 4m, and the step is not filled.
4) Laying a second filling footage grouting anchor rope: as shown in fig. 5, the second filling footage grouting anchor cable is in threaded connection with the first filling footage grouting anchor cable, the other end of the second filling footage grouting anchor cable is temporarily fixed on the top plate, the horizontal distance between the grouting anchor cables is 1m, and the threaded connection end of the grouting anchor cable exceeds the second filling footage by 0.3m so as to facilitate connection of the grouting anchor cables.
5) And (3) filling a gob by a third filling footage: as shown in FIG. 6, coal seam 8m is continuously mined in an upward-going mode, the total mining time is 24m, the fully mechanized mining support occupies 4m, and the goaf is filled with loose materials such as construction waste, coal mine waste rock and the like, and the filling footage of the goaf is 8 m.
6) Laying a third filling footage grouting anchor rope: as shown in fig. 6, the third filling footage grouting anchor cable and the second filling footage grouting anchor cable are connected together through a thread 6 and a threaded connection nut 7, a layer of grouting anchor cable with grouting openings is laid near the top plate, the horizontal distance between the grouting anchor cables is 1m, and the grouting ends of the grouting anchor cables respectively exceed 0.30m, so as to facilitate grouting.
7) Grouting: as shown in fig. 7, the grouting opening 2 of the grouting anchor cable is communicated with a grouting pump, the grouting pump is used for grouting into the grouting core tube 3, the grout spreads from the middle part to the periphery of the loose body, and the loose body is cemented into a whole after the grout is solidified.
8) Repeating the steps, wherein the first filling footage is used for filling the goaf, the coal seam is mined in an upward mode by 8m, the goaf is filled with loose materials such as construction waste, coal mine waste rock and the like, and the filling footage of the goaf is 8m and is not 4m any more; and filling all the goaf until the coal seam is completely mined.
Example two
In the above technical scheme, when the roof surrounding rock condition is a condition of stable surrounding rock, unstable surrounding rock or extremely unstable surrounding rock in class iii-v, the roof condition is poor, and the filling method includes the following steps:
1) non-filling mining: as shown in FIG. 8, the coal seam is mined in an upward-going mode by 8m, the fully mechanized coal mining supports occupy 4m, and the goaf is not filled.
2) Filling and mining: as shown in fig. 9, coal seam 4m is continuously mined in an upward-going manner, and the goaf 4m is filled with loose materials such as construction waste, coal mine waste rock and the like, so that large loose bodies are ensured to be on two sides and small particles are arranged in the goaf as much as possible, and self-stability and later-stage anchoring are facilitated.
3) Laying a grouting anchor cable: as shown in fig. 10, a layer of grouting anchor cables with grouting ports is laid near the top plate, the horizontal distance between the grouting anchor cables is 1m, and the grouting ends at the two ends of each grouting anchor cable exceed 0.3m, so that grouting is facilitated.
4) Grouting: as shown in fig. 11, the grouting opening 2 of the grouting anchor cable is communicated with a grouting pump, grouting is performed into the grouting core tube 3 through the grouting pump, the gap between the loose bodies is filled with the grout, and the loose bodies are cemented into a whole after the grout is solidified.
5) And repeating the steps, wherein filling mining is not carried out at the moment, and the coal seam is mined in an upward-going mode for 4m instead of 8m until the coal seam is completely mined and the goaf is completely filled.
However, the above description is only an embodiment of the present invention, and the scope of the present invention should not be limited by this, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.
Claims (2)
1. A filling method for completely filling loose bodies is characterized in that a grouting anchor cable applied by the method is provided with a cable body, a grouting core tube and a grout outlet are arranged in the cable body, the grout outlet is arranged on the grouting core tube, a plurality of steel strands are wound on the periphery of the grouting core tube, the steel strands uniformly and tightly surround the grouting core tube in a spiral shape, the length of the grouting core tube is the length of the grouting anchor cable, the length of the grouting anchor cable is 0.3m longer than the size of a filling footage, two ends of the cable body are respectively provided with threads and threaded connecting nuts, and the grouting anchor cables can be connected together through the threads and the threaded connecting nuts; the method is characterized in that when the roof surrounding rock condition is in the condition of I-type stable surrounding rock or II-type relatively stable surrounding rock, the roof condition is good, and the filling method comprises the following steps:
1) the first filling footage filling goaf: the coal seam is mined in an upward-going mode, wherein the fully-mechanized mining support occupies 4m, and then a goaf is filled with building garbage and coal mine waste rocks, and the filling footage of the goaf is 4 m;
2) laying a first filling footage grouting anchor rope: a layer of grouting anchor cables without grouting ports are laid close to the top plate, the horizontal distance between the grouting anchor cables is 1m, the threaded connection end of the grouting anchor cable exceeds 0.3m, and the grouting anchor cables are convenient to connect;
3) and a second filling footage goaf: continuously exploiting the coal seam 8m in an upward-going mode, wherein the step is not carried out for filling;
4) laying a second filling footage grouting anchor rope: the second filling footage grouting anchor cable is connected with the first filling footage grouting anchor cable through a screw thread and a screw thread connecting nut, the other end of the second filling footage grouting anchor cable is temporarily fixed on the top plate, the horizontal distance between the grouting anchor cables is 1m, and the screw thread connecting end of the grouting anchor cable exceeds the second filling footage by 0.3m so as to be convenient for connection of the grouting anchor cables;
5) and (3) filling a gob by a third filling footage: continuously mining the coal seam in an upward-going manner for 8m, and filling a goaf by using the building waste and the coal mine waste rock, wherein the filling footage of the goaf is 8 m;
6) laying a third filling footage grouting anchor rope: the third filling footage grouting anchor cable is in threaded connection with the second filling footage grouting anchor cable, a layer of grouting anchor cable with a grouting opening is laid close to the top plate, the horizontal distance between the grouting anchor cables is 1m, and the grouting end of the grouting anchor cable exceeds 0.3m, so that grouting is facilitated;
7) grouting: communicating a grouting opening of the grouting anchor cable with a grouting pump, grouting into the grouting core pipe through the grouting pump, enabling the grout to diffuse from the middle part to the periphery of the loose body, and cementing the loose body into a whole after the grout is solidified;
8) and (4) repeating the steps 1) to 7), wherein the first filling footage is used for filling the goaf, the ascending mining coal seam is 8m, the goaf is filled with the building waste and the coal mine waste rock, and the goaf filling footage is 8m until the coal seam is completely mined and the goaf is completely filled.
2. A filling method for filling a loose body entirely, characterized in that when the roof wall conditions are in the conditions of stable, unstable or extremely unstable surrounding rocks of class iii-v, etc., the roof conditions are poor, the filling method comprises the steps of:
1) non-filling mining: 8m of coal seam is mined in an upward-going mode, the fully-mechanized coal mining support occupies 4m, and filling is not performed at the moment;
2) filling and mining: continuously mining the coal seam in an upward mode for 4m, and filling the goaf for 4m with building garbage and coal mine waste rock;
3) laying a grouting anchor cable: laying a layer of grouting anchor cables with grouting ports close to the top plate, wherein the horizontal distance between the grouting anchor cables is 1m, and the grouting end exceeds 0.3m so as to facilitate grouting;
4) grouting: communicating a grouting opening of the grouting anchor cable with a grouting pump, grouting into the grouting core pipe through the grouting pump, filling gaps among the loose bodies with the grout, and cementing the loose bodies into a whole after the grout is solidified;
5) and (4) repeating the steps 1) to 4), wherein the filling mining is not carried out, the coal seam is mined in an upward-going mode for 4m until the coal seam is completely mined, and the goaf is completely filled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811342636.9A CN109578036B (en) | 2018-11-12 | 2018-11-12 | Grouting anchor cable for completely filling loose bodies and filling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811342636.9A CN109578036B (en) | 2018-11-12 | 2018-11-12 | Grouting anchor cable for completely filling loose bodies and filling method |
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| Publication Number | Publication Date |
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| CN109578036A CN109578036A (en) | 2019-04-05 |
| CN109578036B true CN109578036B (en) | 2020-05-26 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016034A (en) * | 2012-11-03 | 2013-04-03 | 孟钧 | Mining hollow grouting anchor cable |
| CN202926355U (en) * | 2012-10-31 | 2013-05-08 | 于守东 | Hollow grouting anchor cable for mine |
| CN203669900U (en) * | 2014-01-22 | 2014-06-25 | 湖南科技大学 | Grouting anchor cable device |
| CN104405423A (en) * | 2014-10-23 | 2015-03-11 | 山西晋城无烟煤矿业集团有限责任公司 | Mining grouting anchor rope |
| CN205558944U (en) * | 2016-03-11 | 2016-09-07 | 李华诚 | Cavity slip casting anchor rope |
| EP3080396A2 (en) * | 2013-12-12 | 2016-10-19 | NCM Innovations (pty) Ltd | Multiple-point anchored rock bolt |
-
2018
- 2018-11-12 CN CN201811342636.9A patent/CN109578036B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202926355U (en) * | 2012-10-31 | 2013-05-08 | 于守东 | Hollow grouting anchor cable for mine |
| CN103016034A (en) * | 2012-11-03 | 2013-04-03 | 孟钧 | Mining hollow grouting anchor cable |
| EP3080396A2 (en) * | 2013-12-12 | 2016-10-19 | NCM Innovations (pty) Ltd | Multiple-point anchored rock bolt |
| CN203669900U (en) * | 2014-01-22 | 2014-06-25 | 湖南科技大学 | Grouting anchor cable device |
| CN104405423A (en) * | 2014-10-23 | 2015-03-11 | 山西晋城无烟煤矿业集团有限责任公司 | Mining grouting anchor rope |
| CN205558944U (en) * | 2016-03-11 | 2016-09-07 | 李华诚 | Cavity slip casting anchor rope |
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| CN109578036A (en) | 2019-04-05 |
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