CN110792463A - Reinforcing method for machine path leakage top of working surface under complex conditions - Google Patents
Reinforcing method for machine path leakage top of working surface under complex conditions Download PDFInfo
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- CN110792463A CN110792463A CN201911093387.9A CN201911093387A CN110792463A CN 110792463 A CN110792463 A CN 110792463A CN 201911093387 A CN201911093387 A CN 201911093387A CN 110792463 A CN110792463 A CN 110792463A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 13
- 239000003245 coal Substances 0.000 claims abstract description 73
- 238000005065 mining Methods 0.000 claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 13
- 238000004901 spalling Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 3
- 239000003292 glue Substances 0.000 claims description 16
- 239000002023 wood Substances 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 230000035939 shock Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/0086—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor in galleries
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/03—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention relates to the technical field of coal mining, in particular to a reinforcing method for a working face machine way passing leaking roof under a complex condition; the method comprises the following steps: anchor rods and anchor cables are constructed, and the expansion of rib spalling and roof caving ranges is prevented; the second step is that: forming a roof; the third step: injecting rock huh to fill the broken top plate; the fourth step: injecting Mary powder to reinforce the crushed coal rock roof; the fifth step: the mining height is reduced, and the propelling speed of a working face is increased; and a sixth step: other measures; by using the method, the top plate of the working surface is effectively controlled, the normal production of the working surface is ensured, and the safe production is realized; the method has the advantages of accelerating the advancing speed of the working face, smoothly solving the problem of rapid mining of the fully mechanized working face under complex geological conditions and pressure areas, keeping the mine yield stable, realizing balanced production and providing precious experience for the mine under the condition that the working face rapidly passes the complex geological conditions and the pressure areas in future.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a reinforcing method for a working face machine way passing leaking roof under a complex condition.
Background
When a coal mining machine opens a machine pit at the tail part of the underground coal mine, a long top plate in the front of a roadway falls easily when the coal mining machine cuts through the tail coal wall, and the safety exit of the roadway is blocked. Cause roof caving: a fault is exposed at the position of a roadway away from the open-off cut hole, top coal near the upper and lower plates of the fault is crushed, the joint and bedding development is realized, and the management difficulty of the crushed top coal after the igneous rock damages the coal body during tunneling is large. In addition, the working face is influenced by the square pressure of the working face, when the working face has serious roof leakage, the overlying hard sandstone roof falls off, so that the working face is trapped in extreme trouble and is difficult to push. Reasonable and effective technical measures can reduce the extraction degree and range and ensure that the working face quickly passes through the top-emitting area. If the roof fall is not timely treated, the local roof fall can be gradually developed into a large-area roof fall under the influence of mining, so that the roof fall must be treated by adopting a reasonable and effective treatment means to prevent the roof fall accident.
Disclosure of Invention
The invention provides a reinforcing method for a machine passage leaking roof of a working face under a complex condition, which aims to solve the technical problems of reducing the extraction degree and range and ensuring that the working face quickly passes through an overflowing area when the working face has serious leaking roof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for reinforcing a working surface machine passage leaking roof under complex conditions comprises the following steps:
the first step is as follows: anchor rods and anchor cables are constructed, and the expansion of rib spalling and roof caving ranges is prevented;
the second step is that: forming a roof, namely forming the roof by punching a wood pile on the support, wherein the wood beam at the lowest edge of the wood pile must be lapped on a front beam of the support, and is fixed with a constructed roof anchor cable by using an anchor chain at the side of the coal wall;
the third step: injecting rock huh to fill the broken top plate;
the fourth step: injecting Mary powder to reinforce the crushed coal rock roof, perforating the roof, wherein the hole distance is 2-3 m, the hole depth is 3-5 m, the inclination angle is 45-80 degrees, and the glue injection amount of each hole is proper to the roof backflow glue and is not too large;
the fifth step: the mining height is reduced, and the propelling speed of a working face is increased;
and a sixth step: other measures are as follows:
(1) adjusting a coal mining process, adopting a one-way coal cutting method for coal cutting of a working face during the period of basically jacking to press, not pulling and moving a support when a coal mining machine cuts a solid cutter from the tail to the head, and pulling and moving the support by 3 supports of a rear roller of the coal mining machine after the working face returns a blank cutter from the head to the tail;
(2) the coal mining machine is rapidly propelled, and only mechanical mining is carried out during the pressure coming period, and coal discharging is not carried out.
(3) Adjusting the opening value of a safety valve, wherein the opening value of a ZF13000 type bracket safety valve is 40.43 Mpa;
(4) the bracket is moved in advance, so that the top beam of the bracket props against the coal wall and the top plate is not exposed;
(5) wiping the top with pressure to move the support, enabling the support to still keep certain working resistance during moving the support, starting the push-pull jack, then gradually unloading, enabling the beam and the top plate to keep certain supporting resistance, and moving forwards with pressure;
(6) laying a metal net, controlling a local composite top plate of a working surface, laying the metal net on a top beam of the bracket, wherein the lap joint length between the nets is 200mm, and placing a new net piece below an old net piece;
(7) and (3) erecting a walking beam, drilling coal holes with the depth of 500mm by using a powerful coal electric drill to be attached to a top plate, then driving the walking beam into the position, close to the top plate, of the coal wall by using a sledge hammer, wherein the length of the walking beam is 2000-2500 mm, one end of the walking beam is erected on the coal wall, and the other end of the walking beam is erected on a top beam of the support. If the coal wall is easy to be broken, the coal wall is not suitable for or can not dig a beam pit, and a temporary side sticking column can be arranged on the side close to the coal wall;
(8) a metal net is laid on the walking beam, when the top plate in the range of the front roof control of the coal wall is particularly broken, in order to ensure that the support moves forward smoothly, the top net can be unfolded smoothly, the metal net is laid on the walking beam, the walking beam supports the top plate in advance, and the support moves forward under the shielding of the walking beam and the metal net;
(9) and (4) setting a wood pile for roof-contacting, and erecting the wood pile above the top beam of the support for roof-contacting when the roof-fall support above the top beam of the support cannot be roof-contacted.
Compared with the prior art, the invention has the following beneficial effects:
by using the method, the top plate of the working surface is effectively controlled, the normal production of the working surface is ensured, and the safe production is realized; the method has the advantages of accelerating the advancing speed of the working face, smoothly solving the problem of rapid mining of the fully mechanized working face under complex geological conditions and pressure areas, keeping the mine yield stable, realizing balanced production and providing precious experience for the mine under the condition that the working face rapidly passes the complex geological conditions and the pressure areas in future.
Drawings
FIG. 1 is a schematic view of the frame walking beam of the present invention.
The figures are labeled as follows:
1-coal wall, 2-strike beam, 3-hydraulic support and 4-suspension type single column.
Detailed Description
The present invention is further illustrated by the following specific examples.
Examples
In the embodiment, the four-old ditch mine of the university coal mine group Limited liability company is taken as an example:
12 months in 2018, 5 days at night 21: and 00 minutes, when the coal mining machine is driven to the tail to open the pit, at the moment of cutting through the tail coal wall, a long top plate 4.5m before the tunnel between 116 and 5106 lanes falls off, the height cannot be visually observed on site, and the 5106 lane safety outlet is blocked. In the 12-month 22-day night shift in 2018, the 8106 working face is affected by the square pressure of the working face, the serious roof leakage occurs when 40 to 110 working faces are erected, the roof fall height reaches more than 10m, the local part reaches more than 20m, and C2 is overlaid#The hard sandstone roof falls off, so that the working face falls into extreme predicament and is difficult to push.
Aiming at the situation, the reinforcing method for the working face machine way passing leaking roof comprises the following steps:
the first step is as follows: anchor rods and anchor cables are constructed, and the expansion of the rib spalling and roof caving ranges is prevented.
① constructing a 22mm phi 2400mm glass fiber reinforced plastic anchor rod on the rib section of the working face, and controlling rib so as to prevent the rib range from spreading.
② constructing locking anchor cables in the range of 5m extending from the edge and two sides of the top plate crushing area to prevent the roof fall range from expanding.
③ in order to prevent roof fall area, anchor cable is constructed by coal wall top plate according to site conditions.
The second step is that: construct the top
Because the roof fall scope is big, the support top many places are collapsed basically, must beat the buttress structure top on the support. The wood beam at the lowest side of the wood pile must be lapped on the front beam of the bracket and is fixed with a top anchor cable for construction by an anchor chain at the side of the coal wall. The requirements are as follows:
① before constructing roof, anchor rod is first constructed to reinforce the wall of coal to prevent people from being hurt by wall caving.
② the construction platform is built on the top construction section, which is convenient for workers to operate.
③ the net should be laid at the connection position of the bracket to prevent the waste rock from dropping between the brackets and hurting people.
④ the wooden piles must be connected with the solid top plate.
The third step: Ingao-Luo-Hu filling crushing top plate
The rock foam is composed of resin and a catalyst, has high expansibility, has the volume after expansion of 25-30 times of the original volume, is quick in foam reaction, can be reacted for 20-30 seconds at normal temperature, is hardened within 20 minutes, has stable performance after forming, has good flexibility, can deform without cracking when being pressed, has high filling speed, good construction safety, does not need a leakage-proof support, and has insufficient pressure resistance of about 0.2 MPa. The requirements are as follows:
① the grouting amount is determined according to the rock breaking degree and the size of the empty space on site.
② the hole depth and hole position of the drilled hole are ensured, so as to ensure the expansion of the slurry in the effective diffusion radius and ensure the grouting effect.
③ grouting personnel should look at grouting amount and diffusion range during construction, and prepare cotton yarn and wood wedge to block leakage area to ensure reinforcement effect.
④ at the construction site, the grouting pump personnel should observe the pressure gauge values, the resin and catalyst mix ratio, the safety valve, and the speed of movement of the pump piston.
The fourth step: marisia injection reinforced and crushed coal rock roof
Marilsan is a high polymer material, and starts a gel reaction within 20-40 seconds to form a high-strength gel solidification body, and because the Marilsan is a solution type liquid and expands in the reaction process, the Marilsan can permeate into tiny cracks, and a good reinforcing effect is obtained. Because the Roche mainly plays a filling role and has low compressive strength, Marilsan is continuously filled in the range of the top plate and the forward upper part of the working face in the advancing direction after the broken top plate is filled in the Roche, and the broken top plate and the wood pile forming the top are bonded and reinforced into a false top with higher compressive strength by using the bonding effect of Marilsan, so that the support is tightly connected with the top, the initial supporting force is achieved, and the top plate is prevented from falling down again. After the working face is pushed, the advanced top plate is also controlled due to the bonding effect of Marilsan, and the roof fall probability is reduced.
The requirements are as follows:
① holes are drilled on the top plate, the pitch of the holes is 2-3 m, the depth of the holes is 3-5 m, and the inclination angle is 45-80 degrees.
② the glue injection amount of each hole is preferably the top plate backflow glue, and is not too large, and the glue injection amount can be mastered at any time according to the field condition and the top plate crack.
③ during the process of glue injection, the worker should pay attention to the amount of glue injection, the proportion of glue injection and the diffusion range, and plug the leakage area in time, to reduce the material waste and ensure the effect.
④ the phenomena of glue leakage and glue overflow occur in glue injection, and the glue injection is stopped and the sealing operation is repeated due to poor sealing.
⑤ after filling the glue, the pump and accessories are cleaned.
The fifth step: lower mining height and accelerate the propelling speed of the working face
The main purpose of the 4 steps is to control the expansion of the upper caving and roof caving range of the working face. After the roof is consolidated, support initial supporting force reaches the regulation requirement, guarantees that the support fully meets the top, and the working face has just can impeld smoothly, can guarantee basically not appearing the roof fall in notes Marilsan district section roof, but if adopt the injecting glue control roof for a long time, will invest the fund greatly, reduce enterprise's profit. Therefore, in order to prevent the roof fall phenomenon from occurring again after the working face is pushed forwards, the working face needs to pull the frame in advance, the adaptive roof height reduction is realized, the support is ensured to be fully connected with the roof, and the pushing speed is accelerated.
And a sixth step: other measures
(1) And adjusting a coal mining process, adopting a one-way coal cutting method for coal cutting of a working face during the period of basically jacking, not pulling and moving the support when the coal mining machine cuts the solid cutter from the tail to the head, and pulling and moving the support by 3 supports of a rear roller of the coal mining machine after the working face returns to the empty cutter from the head to the tail.
(2) And (4) rapidly advancing, wherein according to the mine pressure display condition of a working face, all pressure can be released after the pressure is advanced by 3-5 m basically every time, and only mechanical mining is carried out during the pressure-entering period, and coal discharging is not carried out.
(3) And adjusting the opening value of the safety valve. The opening value of the ZF13000 type support safety valve is 40.43Mpa, and the support safety valve can descend to generate a support pressing accident if the support safety valve is opened for a long time. The re-pressurizing opening value of the safety valve is increased to 46mMpa, the 20# to 100# bracket safety valve is gradually replaced after the pressure is basically pressed in the fifth period, and the phenomenon of pressing the bracket with an overlarge area does not occur on the working surface after the safety valve is replaced.
(4) Advance frame
If the composite top plate cannot be maintained by adopting a normal frame moving method or when the caving depth reaches the depth of the uncut coal and the frame is moved first without influencing the coal cutting, the frame can be moved by adopting a forepoling machine, so that the top beam of the support props against the coal wall, and the top plate is not exposed to be supported in advance.
(5) Pressurized top wiping moving frame
When the integrity of the composite top plate is difficult to maintain by adopting normal operation procedures of frame descending and frame moving, the frame moving is carried out by wiping the top plate under pressure. When the support is moved, the support still keeps certain working resistance, the push-pull jack is started firstly, and then the support is unloaded gradually, so that the beam and the top plate keep certain supporting resistance and move forwards under pressure. Therefore, the top plate can not be obviously loosened, the movement of the top plate rock stratum during moving the rack can be reduced to a certain extent, and the damage to the top plate caused by moving the rack is reduced. The top plate can be effectively controlled.
(6) Spread the metal mesh
A composite top plate for the working surface is controlled by laying metal net on the top beam of supporter, the lapping length between net and net is 200mm, new net plate is put under old net plate, the composite top plate is broken when it is put on top beam, and the floated gangue layers with different thickness are formed on top beam, when moving the supporter, the floated gangue leaks from space between supporters and end surface, and the end surface is projected and enlarged, the broken top plate can be integrated by laying top net, so improving the power of top plate, and laying double layers on top net, so ⑴ can prevent the gangue leakage between supporters and end surface, improve the contact state between top beam and top plate, ⑵ can raise average supporting strength and wall rock rigidity ⑶, and can prevent the rib of coal wall, and reduce the depth of rib.
(6) Frame walking beam
And (3) drilling coal holes with the depth of 500mm by using a powerful coal electric drill to be attached to the top plate, then driving the walking beam into the position, close to the top plate, of the coal wall by using a large hammer, wherein the length of the walking beam is 2000-2500 mm, one end of the walking beam is erected on the coal wall, and the other end of the walking beam is erected on the top beam of the support. If the coal wall is easy to be broken, the coal wall is not suitable for or can not dig the beam pit, and a temporary side sticking column can be arranged on the side close to the coal wall. (as shown in FIG. 1)
(7) Walking beam upper laying metal net
When the top plate in the range of the front roof control of the coal wall is particularly broken, in order to ensure that the support moves forward smoothly, the top net can be unfolded smoothly, a metal net is laid on the walking beam, the walking beam supports the top plate in advance, and the support moves forward under the shielding of the walking beam and the metal net.
(8) Set up wooden buttress and connect top
When the roof fall support above the support top beam can not be connected, a wood pile is erected above the support top beam to be connected.
Claims (5)
1. A method for reinforcing a working surface machine passage leaking roof under a complex condition is characterized by comprising the following steps:
the first step is as follows: anchor rods and anchor cables are constructed, and the expansion of rib spalling and roof caving ranges is prevented;
the second step is that: forming a roof, namely forming the roof by punching a wood pile on the support, wherein the wood beam at the lowest edge of the wood pile must be lapped on a front beam of the support, and is fixed with a constructed roof anchor cable by using an anchor chain at the side of the coal wall;
the third step: injecting rock huh to fill the broken top plate;
the fourth step: injecting Mary powder to reinforce the crushed coal rock roof, perforating the roof, wherein the hole distance is 2-3 m, the hole depth is 3-5 m, the inclination angle is 45-80 degrees, and the glue injection amount of each hole is proper to the roof backflow glue and is not too large;
the fifth step: the mining height is reduced, and the propelling speed of a working face is increased;
and a sixth step: other measures are as follows:
(1) adjusting a coal mining process, adopting a one-way coal cutting method for coal cutting of a working face during the period of basically jacking to press, not pulling and moving a support when a coal mining machine cuts a solid cutter from the tail to the head, and pulling and moving the support by 3 supports of a rear roller of the coal mining machine after the working face returns a blank cutter from the head to the tail;
(2) the coal mining machine is quickly propelled, and only mechanical mining is carried out during the pressure coming period, and coal discharging is not carried out;
(3) adjusting the opening value of a safety valve, wherein the opening value of a ZF13000 type bracket safety valve is 40.43 Mpa;
(4) the bracket is moved in advance, so that the top beam of the bracket props against the coal wall and the top plate is not exposed;
(5) wiping the top with pressure to move the support, enabling the support to still keep certain working resistance during moving the support, starting the push-pull jack, then gradually unloading, enabling the beam and the top plate to keep certain supporting resistance, and moving forwards with pressure;
(6) laying a metal net, controlling a local composite top plate of a working surface, laying the metal net on a top beam of the bracket, wherein the lap joint length between the nets is 200mm, and placing a new net piece below an old net piece;
(7) erecting a walking beam, drilling coal holes with the depth of 500mm by using a powerful coal electric drill to be attached to a top plate, then driving the walking beam into the position, close to the top plate, of a coal wall by using a sledge hammer, wherein the length of the walking beam is 2000-2500 mm, one end of the walking beam is erected on the coal wall, and the other end of the walking beam is erected on a top beam of a support;
if the coal wall is easy to be broken, the coal wall is not suitable for or can not dig a beam pit, and a temporary side sticking column can be arranged on the side close to the coal wall;
(8) a metal net is laid on the walking beam, when the top plate in the range of the front roof control of the coal wall is particularly broken, in order to ensure that the support moves forward smoothly, the top net can be unfolded smoothly, the metal net is laid on the walking beam, the walking beam supports the top plate in advance, and the support moves forward under the shielding of the walking beam and the metal net;
(9) and (4) setting a wood pile for roof-contacting, and erecting the wood pile above the top beam of the support for roof-contacting when the roof-fall support above the top beam of the support cannot be roof-contacted.
2. The method for reinforcing the leakage top of the working face machine passage under the complex condition as claimed in claim 1, wherein the concrete method for constructing anchor rods and anchor cables and preventing rib caving and roof caving in the first step is that ① constructs a glass fiber reinforced plastic anchor rod with the diameter of 22mm multiplied by 2400mm on the rib section of the working face and controls rib caving;
② constructing locking anchor cables in the range of 5m extending from the edge and two sides of the top plate crushing area;
③ in order to prevent roof fall area, anchor cable is constructed by coal wall top plate according to site conditions.
3. The method for reinforcing the leakage top of the working face machine passage under the complex condition as claimed in claim 1, wherein the method for constructing the top in the second step is characterized in that an anchor rod is constructed on the coal wall for reinforcement before ① top construction;
② constructing a construction platform on the top construction section;
③ laying net at the joint of the bracket;
④ the wooden piles must be connected with the solid top plate.
4. The method for reinforcing the leakage top of the working face machine passage under the complex condition as claimed in claim 1, wherein the Rockwell foam in the third step is composed of two components of resin and catalyst, has high expansibility, has a volume 25-30 times of the original volume after expansion, is quick in foam reaction, can be reacted within 20-30 seconds at normal temperature, and is hardened within 20 minutes, and has stable performance after molding, good flexibility, deformation without cracking under pressure, high filling speed, good construction safety, and no need of a leakage-proof support.
5. The method for reinforcing the working face machine passage leaking roof under the complex condition as claimed in claim 1, wherein the method for filling the broken roof by injecting the Roeck shock in the third step is required to be ①, wherein the grouting amount is determined according to the breaking degree of the rock on site and the size of the empty roof space;
② ensuring the hole depth and hole position of the drilled hole;
③ grouting personnel pay attention to checking grouting amount and diffusion range during construction, and cotton yarn and wood wedges are prepared to block liquid leakage areas, so that reinforcement effect is guaranteed;
④ at the construction site, the grouting pump personnel pay attention to the pressure gauge values, the resin and catalyst mixing ratio, the safety valve, and the speed of movement of the pump piston.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263483A (en) * | 2021-12-27 | 2022-04-01 | 国家能源集团宁夏煤业有限责任公司 | Processing method for caving space in fully mechanized coal mining face propelling process |
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|---|---|---|---|---|
| GB9012433D0 (en) * | 1989-06-02 | 1990-07-25 | Szentai Gyorgy | Support for underground mining operation |
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