CN109505639B - Gob-side entry driving coal pillar reinforcing system and using method thereof - Google Patents
Gob-side entry driving coal pillar reinforcing system and using method thereof Download PDFInfo
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- CN109505639B CN109505639B CN201910006597.3A CN201910006597A CN109505639B CN 109505639 B CN109505639 B CN 109505639B CN 201910006597 A CN201910006597 A CN 201910006597A CN 109505639 B CN109505639 B CN 109505639B
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- 239000003245 coal Substances 0.000 title claims abstract description 126
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 238000012806 monitoring device Methods 0.000 claims abstract description 21
- 238000004873 anchoring Methods 0.000 claims abstract description 20
- 230000000903 blocking effect Effects 0.000 claims abstract description 20
- 238000007569 slipcasting Methods 0.000 claims abstract description 20
- 230000002787 reinforcement Effects 0.000 claims abstract description 17
- 239000010878 waste rock Substances 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 239000011440 grout Substances 0.000 claims description 58
- 239000002002 slurry Substances 0.000 claims description 51
- 238000003860 storage Methods 0.000 claims description 28
- 238000005553 drilling Methods 0.000 claims description 26
- 238000005065 mining Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000005641 tunneling Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 6
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000005253 cladding Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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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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- Geology (AREA)
- Structural Engineering (AREA)
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- Inorganic Chemistry (AREA)
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Abstract
The invention discloses a gob-side entry driving coal pillar reinforcing system and a using method thereof, and belongs to the technical field of gob-side entry driving support of coal mines. The device comprises a coal pillar reinforcing anchor cable, a grouting drill hole, a grouting monitoring device and a grouting machine, wherein the coal pillar reinforcing anchor cable comprises an anchoring section, a free section and a waste rock blocking device; the anchoring section comprises an air bag, a front fixing ring, a rear fixing ring and a grouting hole, the front fixing ring and the rear fixing ring are used for fixing the air bag, the front fixing ring is positioned at the front end of the air bag, the rear fixing ring is positioned at the rear end of the air bag, and the grouting hole is positioned on the rear fixing ring; the free section includes steel strand wires, tray, tool to lock and interior slip casting pipe, and interior slip casting pipe one end and slip casting jogged joint, and the other end is connected with slip casting monitoring devices, and the gasbag is arranged along steel strand wires length direction, and the gasbag cladding is at the outer peripheral face of steel strand wires. The invention can perform unidirectional coal pillar reinforcement in the gob-side entry driving, and improves the stability and the bearing capacity of the coal pillar.
Description
Technical Field
The invention belongs to the technical field of gob-side entry driving support of coal mines, and particularly relates to a gob-side entry driving coal pillar reinforcement system and a use method thereof.
Background
Along with the improvement of the mechanization degree of coal mining, the increase of the mine yield and the mining depth, the requirements on the coal mining rate and the support technology of a stoping roadway are higher and higher, and the traditional arrangement mode of reserving a wider section coal pillar roadway cannot meet the requirements. The method of gob-side entry driving with narrow coal pillars is one of effective methods for improving the coal extraction rate. The gob-side entry driving is a driving along the edge of the gob after the mining influence caused by the stoping of the working face of the upper section is stable. The gob-side entry driving technology has the advantages of high coal mining rate, easiness in maintenance and the like, and is gradually popularized and applied to a plurality of mining areas in China in recent years, narrow coal pillars are important components of gob-side entry driving surrounding rocks, stability of the narrow coal pillars directly affects stability of the whole roadway, and therefore the narrow coal pillars need to be supported in an enhanced mode.
In the prior art, a series of technical improvements are made for reinforcing a gob-side entry-driving coal pillar, for example: (1) CN201410150974.8 discloses a gob-side entry-driving coal pillar anchor cable opposite-penetrating reinforcing method, which can apply a larger anchoring force to a coal pillar by adopting an anchor cable opposite-penetrating reinforcing technology, improve the supporting strength of the coal pillar and ensure the long-term stability of the coal pillar, but the method needs to punch holes in the coal pillar in advance after the mining of an upper section is finished, install preset anchor cables, and has complicated procedures, in addition, the width reservation of an entry-protecting coal pillar is inaccurate, and the opposite-penetrating reinforcing can not be carried out due to larger errors; (2) CN201710035988.9 discloses a gob-side entry driving coal pillar bidirectional reinforcing method, which adopts an expansion lock type to realize bidirectional reinforcement of a reserved coal pillar for a through anchor cable, and can be completed by constructing on one side of the reserved coal pillar, so that the bearing capacity and stability of an entry protection coal pillar can be enhanced.
Disclosure of Invention
The invention aims to provide a gob-side entry-driving coal pillar reinforcing system and a using method thereof, which can perform unidirectional coal pillar reinforcement in a gob-side entry-driving so as to improve the stability and the bearing capacity of coal pillars.
One of the tasks of the invention is to provide a gob-side entry driving coal pillar reinforcement system, which adopts the following technical scheme:
the utility model provides a gob entry driving coal pillar reinforceing system, includes that the coal pillar consolidates anchor rope, slip casting drilling, slip casting monitoring devices and slip casting machine, its characterized in that:
the coal pillar reinforcing anchor cable comprises an anchoring section, a free section and a waste rock blocking device;
the anchoring section comprises an air bag, a front fixing ring, a rear fixing ring and a grouting hole, the front fixing ring and the rear fixing ring are used for fixing the air bag, the front fixing ring is positioned at the front end of the air bag, the rear fixing ring is positioned at the rear end of the air bag, and the grouting hole is positioned on the rear fixing ring;
the free section comprises a steel strand, a tray, a lock and an inner grouting pipe, one end of the inner grouting pipe is connected with the grouting hole, the other end of the inner grouting pipe is connected with the grouting monitoring device, the air bag is arranged along the length direction of the steel strand, and the air bag is coated on the outer peripheral surface of the steel strand;
the waste rock blocking device comprises a cylinder, a steel plate, a spring, a bolt and canvas, the diameter of the cylinder is the same as that of the steel strand, four fixed connecting devices are uniformly arranged on the outer peripheral surface of the left side of the cylinder, a vertical drilling hole is arranged on the left side of the cylinder, and a transverse drilling hole is arranged in the middle of the cylinder; one end of the steel plate is connected with the fixed connecting device through a bolt; the spring is installed in the transverse drilling hole and the vertical drilling hole, two ends of the spring are connected with a steel plate, an iron wire is contained in the canvas, and the canvas is fixed on the steel plate;
the grouting machine comprises a motor, a grouting steel pipe, a control valve, a grout storage tank, a spiral propelling device, a three-leg support, a grout outlet steel pipe and a rotating speed controller, wherein the grout storage tank is cylindrical, the motor is positioned at the upper part of the grout storage tank, the grouting steel pipe is arranged on the side surface of the upper part of the grout storage tank, the control valve is arranged between the grouting pipe and the grout storage tank, the spiral propelling device is arranged inside the grout storage tank and comprises a shaft core and a spiral blade which is fixedly arranged on the side surface of the shaft core and takes a shaft as a rotating shaft to spirally advance along the axial direction and extends from the front end to the rear end, the inner edge of the spiral blade is closely attached to the shaft core, the outer edge of the spiral blade is closely attached to a shell of the grout storage tank, a groove is correspondingly formed between the adjacent blade body of the spiral blade and the shaft core, and the whole spiral blade forms a spiral conducting groove which extends from the front end surface to the, the three-leg bracket is positioned at the lower part of the grout storage tank, the grout outlet steel pipe is arranged at the bottom of the grout storage tank, a control valve is arranged between the grout outlet steel pipe and the grout storage tank, and the rotating speed controller is arranged on the surface of the grout storage tank.
As a preferred scheme of the present invention, the grouting monitoring device is connected to the grouting machine, the grouting monitoring device includes a main grouting pipe, a main regulating valve is installed on the main grouting pipe, a grout inlet regulating valve is installed on one side of the main regulating valve, a first pressure gauge is connected to the grout inlet regulating valve, a grout outlet regulating valve is installed on the other side of the main regulating valve, a second pressure gauge is connected to the grout outlet regulating valve, a grout inlet hole is formed at the side end of the grout inlet regulating valve of the main grouting pipe, the grout inlet hole is connected to a grout outlet pipe of the grouting machine, a grout outlet hole is formed at the side end of the grout outlet regulating valve, and a grouting hose is connected to the grout outlet hole.
Further, the arrangement mode of the coal pillar reinforced anchor cable is as follows: and (3) drilling three coal pillar reinforced anchor cables in the first row and two coal pillar reinforced anchor cables in the second row, and circulating the steps, wherein the row distance between the coal pillar reinforced anchor cables is 1.5m multiplied by 1.5 m.
Further, the depth of the grouting drill hole is half of that of the coal pillar.
Another task of the present invention is to provide a method for using the gob-side entry driving coal pillar reinforcement system, which sequentially comprises the following steps:
a. drilling anchor cable drill holes at coal pillars on the side of a gob-side entry driving mining area, wherein the depth of each anchor cable drill hole is the penetration depth of each coal pillar;
b. the coal pillar reinforcing anchor cable penetrates through the coal pillar through the anchor cable drill hole, the anchoring section of the coal pillar reinforcing anchor cable and the gangue blocking device are located in the goaf, and the anchoring section of the coal pillar reinforcing anchor cable is tightly attached to the coal pillar wall on the side of the goaf;
c. the waste rock blocking device is arranged in the anchor cable drill hole, the spring is in a compressed state, the steel plate and the canvas are tightly attached to the periphery of the air bag, when the waste rock blocking device enters the goaf, the spring bounces open, the steel plate and the canvas are opened along with the spring, and an umbrella shape is formed, so that the waste rock blocking effect of the goaf is achieved;
d. the grouting hose is connected with the grout outlet, and the grout outlet pipe is connected with the grout inlet;
e. starting a grouting machine, discharging the slurry at a proper speed by adjusting a rotating speed controller, injecting the slurry into an air bag through a grouting monitoring device, observing the values of a pressure gauge I and a pressure gauge II during grouting, controlling the flow of the slurry by adjusting a main adjusting valve, a slurry inlet adjusting valve and a slurry discharge adjusting valve, closing the grouting machine when the values of the pressure gauge I and the pressure gauge II reach specified values, closing the main adjusting valve, and stopping grouting;
f. drilling grouting drill holes between the drill holes of the coal pillar reinforcing anchor cable, wherein the depth of each grouting drill hole is half of that of the coal pillar, and grouting the grouting drill holes through a grouting machine;
g. and (5) constructing the coal pillar reinforcing anchor cable in sequence along the tunneling direction of the roadway, so as to realize the coal pillar reinforcement of the whole working surface.
The beneficial technical effects brought by the invention are as follows:
(1) the method is different from the traditional gob-side entry driving embedded anchor cable reinforcing mode, but the coal pillar reinforcing anchor cable is adopted in the roadway to reinforce the coal pillar, so that mutual restraint of two surfaces of the coal pillar is realized, and the deformation of the coal pillar is limited;
(2) grouting into the coal pillar through the grouting drill hole can improve the integrity of the coal pillar, solve the problems of crushing and low strength of the traditional gob-side entry driving coal pillar, improve the integral stability and bearing capacity of the coal pillar and effectively reduce roadway deformation;
(3) the gangue blocking device for the coal pillar reinforcing anchor rope can effectively prevent gangue in a goaf from pressing or crushing the air bag, and the pressure in the air bag can be known in real time through the grouting monitoring device so as to prevent the air bag from being broken due to overlarge pressure;
(4) the rotating speed of the spiral pushing device is controlled by adjusting the rotating speed controller of the grouting machine, so that the grouting machine can adapt to grouting in different environments, and the grouting speed can be effectively adjusted to prevent the airbag from breaking due to the fact that the grouting speed is too high.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a gob-side entry driving coal pillar reinforcement system according to the present invention;
FIG. 2 is a schematic diagram of arrangement of a coal pillar reinforcing anchor cable and grouting holes;
FIG. 3 is a schematic view of compression of a coal pillar reinforcing anchor cable;
FIG. 4 is a schematic view of the coal pillar reinforcement anchor cable being unfolded;
FIG. 5 is a schematic cross-sectional view of a coal pillar reinforced anchor cable;
FIG. 6 is a schematic diagram of the arrangement of the drill holes of the waste rock blocking device;
FIG. 7 is a schematic view of a grouting monitoring device;
FIG. 8 is a schematic view of a slip casting machine;
FIG. 9 is a schematic view of a rotational speed controller of a grouting machine;
in the figure: 1-laneway; 2-coal pillar; 3-a goaf; 4-coal pillar reinforced anchor cable, 41-anchoring section, 411-air bag, 412-front fixing ring, 413-rear fixing ring, 414-grouting hole, 42-free section, 421-steel strand, 422-grouting hose, 423-tray, 424-lockset, 43-gangue stopping device, 431-high-strength cylinder, 4311-fixed connecting device, 4312-vertical drilling hole, 4313-transverse drilling hole, 432-high-strength steel plate, 433-bolt, 434-high-strength spring and 435-canvas; 5-grouting machine, 51-motor, 52-grouting steel pipe, 53-control valve, 54-stock tank, 55-spiral propelling device, 551-shaft core, 552-helical blade, 56-tripod bracket, 57-slurry outlet pipe, 58-rotating speed controller, 581- "NO" start key, 582- "OFF" stop key and 583-speed control key; 6-grouting monitoring device, 61-main grouting pipeline, 62-grout inlet hole, 63-pressure gauge I, 64-grout inlet adjusting valve, 65-main adjusting valve, 66-pressure gauge II, 67-grout outlet adjusting valve and 68-grout outlet hole; 7-grouting and drilling.
Detailed Description
The invention provides a gob-side entry driving coal pillar reinforcement system and a use method thereof, and in order to make the advantages and technical scheme of the invention clearer and clearer, the invention is described in detail with reference to specific embodiments.
The invention discloses a gob-side entry driving coal pillar reinforcing system which comprises a coal pillar reinforcing anchor cable 4, a grouting drill hole 7, a grouting machine 5 and a grouting monitoring device 6. With reference to fig. 1 and 2, the arrangement of the coal pillar reinforcing anchor cable is as follows: three coal pillar reinforcing anchor cables 4 are dug in the first row, two coal pillar reinforcing anchor cables 4 are dug in the second row, and the circulation is repeated in such a way that the row distance between the coal pillar reinforcing anchor cables 4 is 1.5m multiplied by 1.5 m. And drilling a grouting drill hole 7 between the drill holes of the coal pillar reinforcing anchor cable 4, wherein the depth of the grouting drill hole 7 is half of that of the coal pillar.
Referring to fig. 3 to 6, the pillar reinforcing anchor cable 4 of the present invention includes an anchoring section 41, a free section 42, and a gangue blocking device 43, where the anchoring section 41 includes: an air bag 411, a front fixing ring 412, a rear fixing ring 413 and a grouting hole 414. The air bag 411 is made of high-strength rubber, the air bag 411 is arranged along the length direction of the steel strand 421, and the outer peripheral surface of the steel strand 421 is coated with the air bag 411. The front fixing ring 412 and the rear fixing ring 413 are used for fixing the air bag 411, the front fixing ring 412 is positioned at the front end of the air bag 411, the rear fixing ring 413 is positioned at the rear end of the air bag 411, and the rear fixing ring 413 is provided with a grouting hole.
The free section 42 includes: stranded wire 421, tray 423, tool to lock 424, slip casting hose 422. The specification of the steel strand 421 is determined according to the reinforcing strength of the coal pillar 2. The tray 423 is stamped from a high strength steel sheet. The grouting hose 422 is a high-pressure hose, one end of the grouting hose 422 is connected with the grouting hole 414, and the other end of the grouting hose 422 is connected with the grout outlet 68 of the grouting monitoring device 6.
The waste rock blocking device 43 includes: high-strength column 431, high-strength steel plate 432, high-strength spring 434, bolt 433 and canvas 435. The length of the high-strength cylinder 431 is 30cm, the diameter of the high-strength cylinder 431 is the same as that of the steel strand 421, four fixed connecting devices 4311 are uniformly arranged on the outer peripheral surface of the high-strength cylinder 431 at the position of 5cm on the left side, a vertical drilling 4312 is arranged at the position of 10cm on the left side of the high-strength cylinder 431, and a transverse drilling 4313 is arranged in the middle of the high-strength cylinder 431. The length of the high-strength steel plate 432 is 35cm, the width of the high-strength steel plate 432 is 5cm, the thickness of the high-strength steel plate 432 is 0.8cm, one end of the high-strength steel plate 432 is connected with the fixed connecting device 4311 through a bolt 433, and the number of the high-strength steel plate 432 is four. The high strength springs 434 are disposed in the horizontal and vertical bores 4313 and 4312, and both ends of the high strength springs 434 are connected to the high strength steel plate 432, and there are two high strength springs 434. The canvas 435 contains high-strength iron wires inside, and the canvas 435 is fixed on the high-strength steel plate 432.
The gangue stopping device 43 is connected with the anchoring section 41 through the front fixing ring 412.
The slurry in the air bag 411 is anchoring chemical slurry, and the slurry of the grouting drill hole 7 is cement slurry or chemical slurry such as Marilsan.
Referring to fig. 7-8, the grouting machine 5 of the present invention includes a motor 51, a grouting steel pipe 52, a control valve 53, a slurry tank 54, a screw propulsion device 55, a shaft core 551, a helical blade 552, a tripod 56, a slurry outlet pipe 57, a rotation speed controller 58, an "NO" start key 581, an "OFF" stop key 582, and a speed control key 583.
The slurry storage tank 54 is cylindrical, the motor 51 is positioned at the upper part of the slurry storage tank 54, the grouting steel pipe 52 is arranged at the side surface of the upper part of the slurry storage tank 54, a control valve 53 is arranged between the grouting steel pipe 52 and the slurry storage tank 54, the spiral propelling device 55 is arranged in the slurry storage tank 54, the spiral propelling device 55 comprises a shaft core 551 and a spiral blade 552 which is fixedly arranged at the side surface of the shaft core and takes the shaft as a rotating shaft to spirally advance along the axial direction and extends from the front end to the rear end of the shaft core, the inner edge of the spiral blade 552 is closely attached to the shaft core 551, the outer edge of the spiral blade is closely attached to the shell of the slurry storage tank 54, a groove is correspondingly formed between the adjacent blade body of the spiral blade 552 and the shaft core 551, the whole spiral blade 552 forms a spiral conductive groove which extends from the front end surface to the rear end surface and is communicated with the front end surface and the rear end surface on the shaft core 551, the three-leg bracket 56 is positioned at the lower, the rotating speed controller 58 is arranged on the surface of the stock tank 54, the rotating speed controller 58 comprises a NO start key 581, an OFF stop key 582 and a speed control key 583, and the speed control key 583 is divided into three gears I, II and III.
Specifically, the operation flow of the grouting machine 5 is as follows: when the NO start key 581 on the rotating speed controller 58 is pressed, the motor 51 is started, the motor 51 is rotated in a bearing manner to drive the spiral pushing device 55 in the stock tank 54 to rotate, the spiral pushing device 55 performs high-speed spiral rotation forward work to generate slurry carrying thrust, finally, slurry is discharged from the slurry outlet pipe 57, the OFF stop key 582 on the rotating speed controller 58 is pressed after the grouting is finished, and the grouting machine 5 stops working. The three gear speeds of the 'I', 'II' and 'III' are sequentially increased by adjusting the speed control key 583 on the speed controller 58 to adjust the rotating speed of the screw propulsion device 55, so that the grouting machine is better suitable for grouting work in different environments.
As shown in fig. 9, the grouting monitoring device 6 of the present invention is a main grouting pipe 61 connected to a grouting machine 5, a main regulating valve 65 is installed on the main grouting pipe 61, the main regulating valve 65 can flexibly control the amount of slurry entering, a slurry inlet regulating valve 64 is installed on one side of the main regulating valve 65, a first pressure gauge 63 is connected to the slurry inlet regulating valve 64, the slurry inlet regulating valve 64 can flexibly regulate the pressure of slurry, the first pressure gauge 63 is used for displaying a pressure value to facilitate the regulation of the slurry pressure by the slurry inlet regulating valve 64, a slurry discharge regulating valve 67 is installed on the other side of the main regulating valve 65, a second pressure gauge 66 is connected to the slurry discharge regulating valve 67, the slurry discharge valve 67 is used for controlling the grouting amount input by a grouting hose 422, a slurry inlet hole 62 is installed on the side end of the slurry inlet regulating valve 64 of the main grouting pipe 61, the slurry inlet hole 62 is connected to a grouting machine slurry outlet pipe 57, a slurry outlet hole 68 is installed on the side end of the grouting pipe slurry.
The application method of the gob-side entry driving coal pillar reinforcement system comprises the following steps:
(1) and (3) drilling anchor rope holes on the coal pillars 2 at the side of the gob-side entry driving gob 6, wherein the anchor rope holes penetrate through the coal pillars 2, and the anchor rope holes are used for installing the coal pillar reinforcing anchor ropes 4. The reserved coal pillars along the gob-side entry driving are generally about 3-5m, if the reserved coal pillars are too narrow, the stability and the bearing capacity of the coal pillars cannot be achieved, and the coal pillars are easily crushed to cause roadway deformation and instability; if the coal pillar is set to be too wide, resource waste is caused;
(2) the coal pillar reinforcing anchor cable 4 penetrates through the coal pillar 2 through the anchor cable drilling hole, the anchoring section 41 of the coal pillar reinforcing anchor cable 4 and the gangue blocking device 43 are positioned in the goaf 3, and the anchoring section 41 of the coal pillar reinforcing anchor cable 4 is tightly attached to the coal pillar wall on the side of the goaf 3;
(3) when the waste rock blocking device 43 enters the gob 3, the high-strength spring 434 springs open, the high-strength steel plate 432 and the canvas 435 are unfolded to form an umbrella shape, and the effect of blocking the gangue in the gob 3 can be achieved, so that the gangue is prevented from pressing the air bag 411;
(4) the grouting hose 422 is connected with the grout outlet 68 of the grouting monitoring device 6, and the grout outlet 57 of the grouting machine 5 is connected with the grout inlet 62 of the grouting monitoring device 6;
(5) the grouting machine 5 is started, the rotating speed controller 58 is adjusted to enable the slurry to be discharged at a proper speed, the slurry is injected into the air bag 411 through the grouting monitoring device 6, the numerical values of the first pressure gauge 63 and the second pressure gauge 66 are observed during grouting, the flow of the slurry is controlled by adjusting the main adjusting valve 65, the slurry inlet adjusting valve 64 and the slurry discharge adjusting valve 6, and when the first pressure gauge 63 and the second pressure gauge 66 reach the specified numerical values, the grouting machine 5 is closed, the main adjusting valve 65 is closed, and grouting is stopped. Through experimental tests, grouting is stopped when a pressure gauge on the pressure detection device 6 reaches 2Mpa, the air bag 411 forms a stable anchoring body after waiting for 2-3 hours, the air bag 411 can play an anchoring role after grouting is stable, drilling holes can be plugged, harmful gas in a goaf 3 is prevented from overflowing, after the slurry in the air bag 411 is solidified, a coal pillar reinforcing anchor cable 4 is anchored by using a tray 423 and a lockset 424 on one side of the roadway 1, prestress is applied, and the slurry in the air bag 411 is quick-solidification chemical slurry;
(6) drilling grouting drill holes 7 between the drill holes of the coal pillar reinforcing anchor cable, wherein the depth of each grouting drill hole 7 is half of that of each coal pillar 2, and grouting is performed on the grouting drill holes 7 through a grouting machine 5;
(7) the arrangement mode of the coal pillar reinforcing anchor cable 4 is as follows: three coal pillar reinforced anchor cables 4 are drilled in the first row, two coal pillar reinforced anchor cables 4 are drilled in the second row, and the circulation is repeated in such a way that the row distance between the coal pillar reinforced anchor cables 4 is 1.5m multiplied by 1.5 m;
(8) and (3) constructing a coal pillar reinforcing anchor cable 4 in sequence along the tunneling direction of the roadway to realize the reinforcement of the coal pillar 2 on the whole working surface.
The parts not mentioned above can be realized by referring to the prior art.
It is intended that any equivalents, or obvious variations, which may be made by those skilled in the art in light of the teachings herein, be within the scope of the present invention.
Claims (5)
1. The utility model provides a gob entry driving coal pillar reinforceing system, includes that the coal pillar consolidates anchor rope, slip casting drilling, slip casting monitoring devices and slip casting machine, its characterized in that:
the coal pillar reinforcing anchor cable comprises an anchoring section, a free section and a waste rock blocking device;
the anchoring section comprises an air bag, a front fixing ring, a rear fixing ring and a grouting hole, the front fixing ring and the rear fixing ring are used for fixing the air bag, the front fixing ring is positioned at the front end of the air bag, the rear fixing ring is positioned at the rear end of the air bag, and the grouting hole is positioned on the rear fixing ring;
the free section comprises a steel strand, a tray, a lock and an inner grouting pipe, one end of the inner grouting pipe is connected with the grouting hole, the other end of the inner grouting pipe is connected with the grouting monitoring device, the air bag is arranged along the length direction of the steel strand, and the air bag is coated on the outer peripheral surface of the steel strand;
the waste rock blocking device comprises a cylinder, a steel plate, a spring, a bolt and canvas, the diameter of the cylinder is the same as that of the steel strand, four fixed connecting devices are uniformly arranged on the outer peripheral surface of the left side of the cylinder, a vertical drilling hole is arranged on the left side of the cylinder, and a transverse drilling hole is arranged in the middle of the cylinder; one end of the steel plate is connected with the fixed connecting device through a bolt; the spring is installed in the transverse drilling hole and the vertical drilling hole, two ends of the spring are connected with a steel plate, an iron wire is contained in the canvas, and the canvas is fixed on the steel plate;
the grouting machine comprises a motor, a grouting steel pipe, a control valve, a grout storage tank, a spiral propelling device, a three-leg support, a grout outlet steel pipe and a rotating speed controller, wherein the grout storage tank is cylindrical, the motor is positioned at the upper part of the grout storage tank, the grouting steel pipe is arranged on the side surface of the upper part of the grout storage tank, the control valve is arranged between the grouting pipe and the grout storage tank, the spiral propelling device is arranged inside the grout storage tank and comprises a shaft core and a spiral blade which is fixedly arranged on the side surface of the shaft core and takes a shaft as a rotating shaft to spirally advance along the axial direction and extends from the front end to the rear end, the inner edge of the spiral blade is closely attached to the shaft core, the outer edge of the spiral blade is closely attached to a casing of the grout storage tank, a groove is correspondingly formed between the adjacent blade body of the spiral blade and the shaft core, and the whole spiral blade forms a spiral conducting groove which extends from the front end surface to the rear, the three-leg bracket is positioned at the lower part of the grout storage tank, the grout outlet steel pipe is arranged at the bottom of the grout storage tank, a control valve is arranged between the grout outlet steel pipe and the grout storage tank, and the rotating speed controller is arranged on the surface of the grout storage tank.
2. A gob-side entry-driving coal pillar reinforcement system according to claim 1, wherein: slip casting monitoring devices with the slip casting machine connect, slip casting monitoring devices include main slip casting pipeline, main slip casting pipeline on install the master control valve, master control valve one side is installed and is advanced the thick liquid governing valve, advance to be connected with manometer one on the thick liquid governing valve, the grout release governing valve is installed to master control valve opposite side, be connected with manometer two on the grout release governing valve, main slip casting pipeline advances the thick liquid governing valve side and is advanced the thick liquid hole, advance the thick liquid hole with the play thick liquid union coupling of slip casting machine, the grout release governing valve side is the grout outlet, the grout outlet is connected with the slip casting hose.
3. A gob-side entry-driving coal pillar reinforcement system according to claim 1, wherein: the arrangement mode of the coal pillar reinforcing anchor cable is as follows: and (3) drilling three coal pillar reinforced anchor cables in the first row and two coal pillar reinforced anchor cables in the second row, and circulating the steps, wherein the row distance between the coal pillar reinforced anchor cables is 1.5m multiplied by 1.5 m.
4. A gob-side entry-driving coal pillar reinforcement system according to claim 1, wherein: the depth of the grouting drill hole is half of that of the coal pillar.
5. Use of a gob-side entry-driving coal pillar reinforcement system according to claim 2, characterized in that it comprises the following steps in sequence:
a. drilling anchor cable drill holes at coal pillars on the side of a gob-side entry driving mining area, wherein the depth of each anchor cable drill hole is the penetration depth of each coal pillar;
b. the coal pillar reinforcing anchor cable penetrates through the coal pillar through the anchor cable drill hole, the anchoring section of the coal pillar reinforcing anchor cable and the gangue blocking device are located in the goaf, and the anchoring section of the coal pillar reinforcing anchor cable is tightly attached to the coal pillar wall on the side of the goaf;
c. the waste rock blocking device is arranged in the anchor cable drill hole, the spring is in a compressed state, the steel plate and the canvas are tightly attached to the periphery of the air bag, when the waste rock blocking device enters the goaf, the spring bounces open, the steel plate and the canvas are opened along with the spring, and an umbrella shape is formed, so that the waste rock blocking effect of the goaf is achieved;
d. the grouting hose is connected with the grout outlet, and the grout outlet pipe is connected with the grout inlet;
e. starting a grouting machine, discharging the slurry at a proper speed by adjusting a rotating speed controller, injecting the slurry into an air bag through a grouting monitoring device, observing the values of a pressure gauge I and a pressure gauge II during grouting, controlling the flow of the slurry by adjusting a main adjusting valve, a slurry inlet adjusting valve and a slurry discharge adjusting valve, closing the grouting machine when the values of the pressure gauge I and the pressure gauge II reach specified values, closing the main adjusting valve, and stopping grouting;
f. drilling grouting drill holes between the drill holes of the coal pillar reinforcing anchor cable, wherein the depth of each grouting drill hole is half of that of the coal pillar, and grouting the grouting drill holes through a grouting machine;
g. and (5) constructing the coal pillar reinforcing anchor cable in sequence along the tunneling direction of the roadway, so as to realize the coal pillar reinforcement of the whole working surface.
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| CN111396052B (en) * | 2020-02-18 | 2023-03-07 | 温州大学 | Method for mineralizing and reinforcing coal pillar by urease microorganisms |
| CN111814242B (en) * | 2020-07-16 | 2023-10-03 | 新疆工程学院 | Method and system for judging width of gob-side entry driving coal pillar by utilizing data of Internet of things |
| CN112267884B (en) * | 2020-10-27 | 2022-09-16 | 陕西煤业化工技术研究院有限责任公司 | Composite nano grouting sealing-based gob-side entry driving construction method for remaining small coal pillar |
| CN112459781B (en) * | 2020-10-29 | 2021-11-05 | 煤炭科学研究总院 | Full-automatic pillar filling mining control method and control device |
| CN113153394B (en) * | 2021-03-10 | 2023-10-27 | 中国矿业大学 | Self-expansion reinforced anchoring type anchor rod structure and method for narrow coal pillar along-void gate way end |
| CN112922653B (en) * | 2021-03-16 | 2022-05-10 | 太原理工大学 | Small coal pillar overlapped grouting through anchor cable |
| CN113803087B (en) * | 2021-09-07 | 2023-11-10 | 山西晋煤集团技术研究院有限责任公司 | Small coal pillar gob-side entry driving broken surrounding rock grouting reinforcement method |
| CN116291396B (en) * | 2023-04-07 | 2023-10-20 | 徐州中矿岩土技术股份有限公司 | Method for monitoring goaf slurry migration and condensation in drilled holes in real time |
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