CN110821561A - Pressure pouring composite airtight wall for underground coal mine and construction method thereof - Google Patents
Pressure pouring composite airtight wall for underground coal mine and construction method thereof Download PDFInfo
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- CN110821561A CN110821561A CN201911275280.6A CN201911275280A CN110821561A CN 110821561 A CN110821561 A CN 110821561A CN 201911275280 A CN201911275280 A CN 201911275280A CN 110821561 A CN110821561 A CN 110821561A
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- 239000003245 coal Substances 0.000 title claims abstract description 106
- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 title abstract description 10
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 110
- 239000004567 concrete Substances 0.000 claims abstract description 62
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 38
- 229910000831 Steel Inorganic materials 0.000 claims description 36
- 239000010959 steel Substances 0.000 claims description 36
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 239000011378 shotcrete Substances 0.000 claims description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 101100491335 Caenorhabditis elegans mat-2 gene Proteins 0.000 description 1
- 101100495256 Caenorhabditis elegans mat-3 gene Proteins 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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Abstract
The invention relates to a pressure pouring composite airtight wall for an underground coal mine and a construction method thereof. The airtight wall constructed by the prior art is easy to leak water and air. The front arched reinforcing mesh and the rear arched reinforcing mesh which are oppositely arranged are fixed in a roadway to be closed, concrete mortar is sprayed on the front arched reinforcing mesh and the rear arched reinforcing mesh to form a front arched wallboard and a rear arched wallboard, the concrete mortar is filled between the front arched wallboard and the rear arched wallboard, the rear arched reinforcing mesh is further provided with a pressurizing cylinder, a thin metal sealing disc is arranged at the inner end of the pressurizing cylinder, a round base disc and a screw rod with a hand wheel are arranged, and the hand wheel is rotated to extrude two ends of the concrete mortar into two side coal walls between the front arched wallboard and the rear arched wallboard. The pressurized pouring composite sealing wall for the underground coal mine disclosed by the invention fully utilizes the original anchor rods and the support nets of the roadway, does not need to dig additional embedded grooves, has the advantages of tight joint of the sealing wall body and the coal walls on the two sides and good waterproof effect, and is suitable for constructing a permanent sealing wall in the underground coal mine.
Description
Technical Field
The invention relates to a pressure pouring composite airtight wall for an underground coal mine and a construction method thereof.
Background
During underground construction, a connecting roadway is always arranged between two adjacent crossheading roadways of adjacent working faces, one crossheading roadway on two sides of each working face is an air inlet roadway, and the other crossheading roadway is an air return roadway. In order to ensure the ventilation effect of the working face, when the coal mining operation is carried out on the working face, the connection roadway must be quickly sealed.
At present, a permanent sealing wall is constructed in a coal mine, a metal net originally supported on a coal wall is cut off, an embedded groove is excavated, and then a sealing wall body is constructed.
In the construction process, the metal mesh originally supported by the coal wall is manually cut off, the advantages of the reinforced concrete are not exerted, and the workload is increased.
When the embedded groove is excavated on the coal wall by using the impact drill, the vibration of the impact drill in the excavation process aggravates the looseness of the local coal wall; the supporting strength of the original coal wall is damaged.
Most importantly, there is a large gap between the constructed containment wall 20 and the coal wall of the embedment channel 21 even if the concrete mortar 16 is poured, as shown in fig. 1. After the concrete mortar 16 is solidified into concrete, the concrete and the loosened coal wall cannot be well combined, and water and air leakage is easy to occur.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a pressurized casting composite airtight wall for an underground coal mine and a construction method thereof.
In order to solve the technical problem, the pressure pouring composite airtight wall for the underground coal mine comprises a reinforcing mesh and a sprayed concrete layer, and is characterized in that: the reinforcing mesh comprises a front arch reinforcing mesh and a rear arch reinforcing mesh, the front and rear arch reinforcing meshes comprise arch frames and wire netting welded on the arch frames, each arch frame is formed by welding a plurality of horizontally bent transverse rods and two vertical side rods, two rows of opposite anchor rods which are vertically arranged are respectively arranged on the coal walls on two sides of the roadway to be sealed, the front and rear arch reinforcing meshes are oppositely arranged in the roadway to be sealed under a matched coal mine,
the front arched reinforcing steel bar net and the rear arched reinforcing steel bar net are provided with through holes on two vertical side rods of an arched frame, the arched frames are sleeved on exposed anchor rod heads on two side coal walls in a one-to-one correspondence mode through the through holes, the anchor rod heads are also provided with fastening nuts, the arched frames are firmly fixed on the coal walls on two sides of a roadway to be sealed through the fastening nuts, the front arched reinforcing steel bar net is positioned on one side close to an old pond, the rear arched reinforcing steel bar net is positioned on one side far away from the old pond, the top of the arched frame of the rear arched reinforcing steel bar net is also provided with a grouting pipe and an air pipe in a welding mode, the grouting pipe and the air pipe are respectively provided with a ball valve, the middle part of the rear arched reinforcing steel bar net is also provided with a pressurizing cylinder, the inner end of the pressurizing cylinder is provided with a thin metal sealing disc with annular ripples, the pressurizing cylinder is also internally provided with a circular base disc, the inner end of the screw rod is abutted to the center of the circular base plate, the circular base plate is pressed on the thin metal sealing plate, the sprayed concrete layer is formed by quick-setting concrete mortar sprayed on the front arched reinforcing mesh and the rear arched reinforcing mesh, the quick-setting concrete mortar forms a front arched wallboard and a rear arched wallboard which are opposite to each other in the roadway to be sealed, concrete mortar is filled between the front arched wallboard and the rear arched wallboard, and two ends of the concrete mortar are squeezed into coal walls on two sides between the front arched wallboard and the rear arched wallboard.
With such a design, the following advantages are provided: the concrete mortar is extruded through the pressurizing cylinder during pouring, so that the concrete can be better extruded into gaps between the coal walls on two sides, and meanwhile, under the extrusion of the concrete mortar on the coal walls on two sides, the concrete mortar is uniformly stressed, is firmer and more compact, and the waterproof sealing effect is greatly improved.
Preferably, a metal pipe is welded on the arched frame of the rear arched reinforcing mesh, the inner end of the metal pipe is communicated with the space between the front arched wallboard and the rear arched wallboard, and a pressure gauge is arranged at the outer end of the metal pipe. So design, when being convenient for aerify and leak hunting, the control is aerifyd pressure, and aerifys the back, if in certain time, the pressure numerical value that the manometer shows does not have obvious change, also can prove that the sealed effect of two tunnel arch wallboards is good.
Preferably, the upper edges of the arched frames of the front and rear arched reinforcing meshes are fixed on the anchor rod heads of the top plate of the roadway to be closed. By the design, the front and rear arch reinforcing steel bar nets are fixed more firmly, and the top-contacting effect and the sealing effect are good when mixed soil is sprayed.
Preferably, a plurality of straight steel wire rope inhales are arranged between the two vertical side rods of the front arch-shaped steel bar net, a plurality of straight steel wire rope inhales are arranged between the two vertical side rods of the rear arch-shaped steel bar net, and a turn buckle with hooks at two ends is arranged. So design, be convenient for install preceding, back arch reinforcing bar net.
The construction method for the underground coal mine pressurized pouring composite airtight wall comprises the following steps:
①, selecting proper coal walls with two rows of anchor rods on two sides of the coal walls in the roadway to be sealed as installation positions, cleaning loose coal blocks on the coal walls around the anchor rods,
②, taking the front arch-shaped reinforcing mesh, making the concave surface of the front arch-shaped reinforcing mesh face the old pond of the roadway to be sealed, sleeving the through holes of the vertical side rods on one side of the arch-shaped frame of the front arch-shaped reinforcing mesh on the exposed anchor rod heads on the coal wall on one side of the installation position in a one-to-one correspondence manner, hanging one hook of the turn buckle on the middle section of the adjacent steel wire rope stay cable, connecting the other hook of the turn buckle with the middle section of the horizontal bent cross rod in the middle of the front arch-shaped reinforcing mesh through thick iron wires, adjusting the turn buckle to tighten the steel wire rope stay cable, thereby drawing the two vertical side rods of the front arch-shaped reinforcing mesh close,
then, aligning the through hole of the other side vertical side rod of the arched frame of the front arched steel bar net with the exposed anchor rod head on the other side coal wall, then loosening, taking down the turn buckle bolt, making the two side vertical rods of the front arched steel bar net reset under the elastic rebound action of the horizontal rod which is horizontally bent and sleeved on the anchor rod head on the other side coal wall, fastening the nut on the exposed anchor rod head sleeve, and screwing,
the arch frame is firmly fixed on the coal walls at two sides of the roadway to be sealed by the fastening nut, then the upper edge of the arch frame of the front arch reinforcing bar net is fixed on the anchor rod head of the top plate of the roadway to be sealed by thick iron wires,
③, spraying concrete with accelerating agent on the front arch reinforcing mesh and the coarse iron wire, after the concrete is solidified, the front arch reinforcing mesh and the concrete sprayed on the front arch reinforcing mesh form a front arch wallboard;
④, taking the rear arched steel bar net, arranging the rear arched steel bar net and the front arched steel bar net in a back-to-back manner, sleeving the through holes of the vertical side rods on one side of the arched frame of the rear arched steel bar net on the exposed anchor rod heads on the adjacent coal walls in a one-to-one correspondence manner, hanging one hook of the turn buckle on the middle section of the adjacent steel wire rope stay, connecting the other hook of the turn buckle with the cross of the pressurizing cylinder in the middle of the rear arched steel bar net through thick iron wires, adjusting the turn buckle to tension the steel wire rope stay, thereby drawing the two vertical side rods of the rear arched steel bar net close,
then, aligning the through hole of the other side vertical side rod of the arched frame of the rear arched reinforcing mesh with the exposed anchor rod head on the other side coal wall, then loosening, taking down the turn buckle bolt, making the two side vertical rods of the rear arched reinforcing mesh reset under the elastic rebound action of the horizontally bent cross rod and sleeved on the anchor rod head on the other side coal wall, fastening the nut on the exposed anchor rod head sleeve, and screwing,
the arch frame is firmly fixed on the coal walls at two sides of the roadway to be sealed by the fastening nuts, then the upper edge of the arch frame of the rear arch reinforcing mesh is fixed on the anchor rod head of the top plate of the roadway to be sealed by thick iron wires,
the hand wheel on the pressurizing cylinder of the arched reinforcing mesh is adjusted to prevent the thin metal sealing disc with the annular corrugation from being pressed,
⑤, spraying concrete mortar with accelerator on the rear arch reinforcing mesh and the coarse iron wire, forming a rear arch wallboard by the rear arch reinforcing mesh and the sprayed concrete layer thereon, wherein the grouting pipe and an air pipe are positioned at the top of the rear arch wallboard;
⑥, after the sprayed concrete layer is solidified, closing the ball valve on the grouting pipe at the top of the back arched wallboard, opening the ball valve on the air pipe, inflating air between the front arched wallboard and the back arched wallboard through the air pipe, when the pressure displayed by the pressure gauge reaches 0.2MPa, closing the ball valve on the air pipe, checking whether there is air leakage point at the periphery of the front arched wallboard and the back arched wallboard,
⑦, if there is leakage point, opening the ball valve on the air pipe, deflating, spraying concrete mortar with accelerating agent to the leakage point, after the sprayed concrete is solidified, inflating and checking leakage according to the method of step ⑥ until there is no obvious leakage point around the front arched wallboard and the back arched wallboard, proceeding to the next step,
⑧, opening the ball valve on the grouting pipe and the air pipe on the top of the back arched wallboard, injecting concrete mortar between the front arched wallboard and the back arched wallboard through the grouting pipe, closing the ball valve on the grouting pipe and the air pipe after the concrete mortar is filled, rotating the hand wheel on the pressurizing cylinder before the concrete mortar is initially set, making the screw rod prop on the circular base plate, the circular base plate extrudes the thin metal sealing plate, making the thin metal sealing plate indent, extruding the concrete mortar between the front arched wallboard and the back arched wallboard until the pressure displayed by the pressure gauge reaches 0.2MPa, extruding the coal wall between the front arched wallboard and the back arched wallboard by the extruded concrete mortar, compacting the coal wall, and filling the coal wall into the gap,
⑨, after the concrete mortar between the front and the rear arched wall boards is completely solidified, the pressure casting composite sealing wall for the underground coal mine is obtained.
The pressurized pouring composite sealing wall for the underground coal mine disclosed by the invention fully utilizes the original anchor rods and the support nets of the roadway, no additional embedded groove needs to be dug, the sealing wall body is tightly jointed with the coal walls on the two sides, the waterproof effect is good, and the pressurized pouring composite sealing wall is suitable for constructing a permanent sealing wall in the underground coal mine.
Drawings
The invention further discloses a pressurized pouring composite sealing wall for underground coal mines and a construction method thereof by combining the accompanying drawings:
FIG. 1 is a schematic horizontal sectional structure of a conventional sealing wall for a downhole coal mine;
FIG. 2 is a drawing-in of two vertical side rods of a front arch reinforcing mesh of the press-cast composite containment wall for an underground coal mine by means of a turnbuckle to facilitate the fixing of the two vertical side rods to anchor rods on both sides;
fig. 3 is a schematic structural view of a front arch-shaped reinforcing mesh and a rear arch-shaped reinforcing mesh of the pressure cast composite airtight wall for underground coal mines;
FIG. 4 is a schematic horizontal sectional view (taken along a horizontal plane passing through the axis of the screw) of the press-cast composite bulkhead for underground coal mine.
In the figure: the concrete grouting device comprises a concrete spraying layer 1, a front arch reinforcing mesh 2, a rear arch reinforcing mesh 3, an arch frame 4, a cross rod 41, a vertical side rod 42, a roadway to be sealed 5, a coal wall 6, an anchor rod head 7, a fastening nut 8, a old pond 9, a grouting pipe 43, an air pipe 44, a pressurizing cylinder 10, a thin metal sealing disc 11, a circular base disc 12, a cross 13, a lead screw 14, a hand wheel 15, concrete mortar 16, a metal pipe 45, a pressure gauge 46, a steel wire rope 17, a basket bolt 18, a thick iron wire 19, a sealing wall constructed by the prior art 20 and an embedded groove in the prior art 21.
Detailed Description
The first implementation mode comprises the following steps: as shown in fig. 2-4, the pressure-casting composite airtight wall for underground coal mine comprises a reinforcing mesh and a sprayed concrete layer 1, and is characterized in that: the reinforcing mesh comprises a front arched reinforcing mesh 2 and a rear arched reinforcing mesh 3, the front arched reinforcing mesh 2 and the rear arched reinforcing mesh 3 both comprise arched frames 4 and wire netting welded on the arched frames, each arched frame is formed by welding a plurality of horizontally bent cross rods 41 and two vertical side rods 42, two rows of opposite anchor rods which are vertically arranged are respectively arranged on coal walls 6 at two sides of a roadway 5 to be sealed, the front arched reinforcing mesh 2 and the rear arched reinforcing mesh 3 are arranged in the roadway 5 to be sealed under a coal mine in a back-to-back manner for matching,
the two vertical side rods 42 of the arched frames 4 of the front arched reinforcing mesh and the rear arched reinforcing mesh are provided with through holes which are sleeved on the exposed anchor rod heads 7 on the coal walls 6 on the two sides in a one-to-one correspondence way, the anchor rod heads 6 are also provided with fastening nuts 8, the arched frames 4 are firmly fixed on the coal walls 6 on the two sides of the roadway 5 to be sealed, the front arched reinforcing mesh 2 is positioned on one side close to the old pond 9 (the old pond refers to a mined area and a abandoned roadway under a mine), the rear arched reinforcing mesh 3 is positioned on one side far away from the old pond 9, the top of the arched frame 4 of the rear arched reinforcing mesh 3 is also provided with a grouting pipe 43 and an air pipe 44 in a welding way, the grouting pipe 43 and the air pipe 44 are respectively provided with ball valves, the middle part of the rear arched reinforcing mesh 3 is also provided with a pressurizing cylinder 10, the inner end of the pressurizing cylinder 10 is provided with a thin metal sealing disc 11 with annular corrugation, the, the outer end of the pressurizing cylinder is connected with a cross 13, the center of the cross 13 is provided with a threaded through hole, the threaded through hole is provided with a lead screw 14, the outer end of the lead screw is provided with a hand wheel 15, the inner end of the lead screw 14 is abutted against the center of a circular base plate 12, the circular base plate 12 is pressed on a thin metal sealing plate 11, the sprayed concrete layer 1 is formed by quick-setting concrete mortar sprayed on a front arched reinforcing mesh 2 and a rear arched reinforcing mesh 3, the quick-setting concrete mortar forms a front arched wallboard and a rear arched wallboard which are opposite to each other in a roadway 5 to be sealed, concrete mortar 16 is filled between the front arched wallboard and the rear arched wallboard, and two ends of the concrete mortar 16 are extruded into coal walls 6 on two sides between the front arched wallboard and the rear arched wallboard.
The arch frame 4 of the rear arch reinforcing mesh 3 is welded with a metal pipe 45, the inner end of the metal pipe 45 is communicated with the space between the front arch wallboard and the rear arch wallboard, and the outer end of the metal pipe 45 is provided with a pressure gauge 46.
The upper edges of the arch frames 4 of the front and the rear arch reinforcing meshes 2 and 3 are fixed on an anchor rod head 7 of a top plate of the roadway to be closed.
A plurality of straight steel wire rope inhaul cables 17 are arranged between the two vertical side rods 42 of the front arched steel bar net 2, a plurality of straight steel wire rope inhaul cables 17 are arranged between the two vertical side rods of the rear arched steel bar net, and a turn buckle 18 with hooks at two ends is arranged.
The construction method of the pressurized pouring composite airtight wall for the underground coal mine comprises the following steps:
①, selecting proper coal walls with two rows of anchor rods on the coal walls 6 on two sides in the laneway 5 to be sealed as installation positions, and cleaning loose coal blocks on the coal walls on the periphery of the anchor rods.
②, taking the front arch-shaped reinforcing mesh 2, making the concave surface of the front arch-shaped reinforcing mesh 2 face the old pond of the roadway 5 to be closed, sleeving the through holes of the vertical side rod 42 at one side of the arch-shaped frame 4 of the front arch-shaped reinforcing mesh 2 on the exposed anchor rod head 7 on the coal wall 6 at one side of the installation position in a one-to-one correspondence manner, hanging one hook of the turn buckle 18 on the middle section of the adjacent steel wire rope stay 17, connecting the other hook of the turn buckle 18 with the middle section of the horizontal bent cross rod 41 at the middle part of the front arch-shaped reinforcing mesh 2 through the thick iron wire 19, adjusting the turn buckle 18 to tighten the steel wire rope stay 17, thereby drawing the two vertical side rods 42 of the front arch-shaped reinforcing mesh 2 close to each other, as shown in fig. 2.
Then, the through hole of the other side vertical side lever 42 of the arch frame 4 of the front arch-shaped reinforcing bar net 2 is aligned to the exposed anchor rod head 7 on the other side coal wall 6, then the turn buckle 18 is loosened, the two vertical side levers 42 of the front arch-shaped reinforcing bar net 2 are reset under the elastic rebound action of the horizontally bent cross rod 41 and are sleeved on the anchor rod head on the other side coal wall 6, the exposed anchor rod head 7 is sleeved with the fastening nut 8 and is screwed,
the arch frames 4 of the front arch-shaped reinforcing mesh 2 are firmly fixed on the coal walls 6 at two sides of the roadway 5 to be sealed by the fastening nuts 8, and then the upper edge of the arch frame 4 of the front arch-shaped reinforcing mesh 2 is fixed on the anchor rod head 7 of the top plate of the roadway 5 to be sealed by thick iron wires. (not shown in the figure)
③, spraying concrete with accelerating agent on the front arch reinforcing mesh 2 and the coarse iron wire, after the concrete is solidified, the front arch reinforcing mesh 2 and the concrete sprayed on the front arch reinforcing mesh form a front arch wallboard;
④, taking the rear arched reinforcing mesh 3, putting the rear arched reinforcing mesh 3 opposite to the front arched reinforcing mesh 2 (as shown in fig. 3), sleeving the through holes of the vertical side rods 42 on one side of the arched frame 4 of the rear arched reinforcing mesh 2 on the exposed anchor heads 7 on the adjacent coal wall 6 in one-to-one correspondence, hanging one hook of the turn buckle 18 on the middle section of the adjacent steel wire rope 17, connecting the other hook of the turn buckle 18 with the cross 13 of the pressurizing cylinder 10 in the middle of the rear arched reinforcing mesh 2 through the thick iron wire 19, adjusting the turn buckle 18 to make the steel wire rope tension the stay 17, thereby drawing the two vertical side rods 4 of the rear arched reinforcing mesh 3 close.
Then, the through holes of the other side vertical side rods 42 of the arched frames 4 of the rear arched reinforcing mat 3 are aligned with the exposed anchor heads 7 on the other side coal wall 6, and then the turn buckle 18 is released, so that the two vertical side rods 42 of the rear arched reinforcing mat 2 are restored by the elastic rebound of the horizontally bent cross bar 41 and are fitted over the anchor heads 7 on the other side coal wall 6, the exposed anchor heads 7 are fitted over the fastening nuts 8 and tightened,
the fastening nuts 8 firmly fix the arch frames of the rear arch-shaped reinforcing meshes 3 to the coal walls on both sides of the roadway to be closed, and then the upper edges of the arch frames 4 of the rear arch-shaped reinforcing meshes are fixed to the anchor heads 7 of the roof of the roadway 5 to be closed by using thick iron wires.
The hand wheel 15 on the pressurizing cylinder 10 of the arched reinforcing mesh 3 is adjusted to make the thin metal sealing disc 11 with the annular corrugation not be pressed.
⑤, spraying concrete mortar with accelerator on the rear arch reinforcing mesh 3 and the coarse iron wires, forming a rear arch wallboard by the rear arch reinforcing mesh 3 and the sprayed concrete layer thereon, wherein the grouting pipe 43 and an air pipe 44 are positioned at the top of the rear arch wallboard;
⑥, after the sprayed concrete layer is solidified, closing the ball valve on the grouting pipe 43 at the top of the back arched wallboard, opening the ball valve of the air pipe 44, inflating air between the front arched wallboard and the back arched wallboard through the air pipe 44, when the pressure displayed by the pressure gauge reaches 0.2MPa, closing the ball valve on the air pipe 44, checking whether there is air leakage point at the periphery of the front arched wallboard and the back arched wallboard,
⑦, if there is leakage point, opening the ball valve on the air pipe 44, deflating, spraying concrete mortar with accelerating agent to the leakage point, after the sprayed concrete is solidified, inflating and checking leakage according to the method of step ⑥ until there is no obvious leakage point around the front arched wallboard and the back arched wallboard, proceeding to the next step,
⑧, opening the ball valve on the grouting pipe 43 and the air pipe 44 on the top of the back arched wall board 2, injecting concrete mortar between the front arched wall board and the back arched wall board through the grouting pipe 43, closing the ball valve on the grouting pipe 43 and the air pipe 44 after the concrete mortar is filled, before the concrete mortar is initially set, rotating the hand wheel 15 on the pressurizing cylinder 10 to make the screw rod prop on the circular base plate, the circular base plate extrudes the thin metal sealing plate to make the thin metal sealing plate 11 indent, and the concrete mortar between the front arched wall board and the back arched wall board is extruded until the pressure displayed by the pressure gauge reaches 0.2MPa, the coal wall 6 between the front arched wall board and the back arched wall board is extruded by the extruded concrete mortar, compacted, and filled into the gap on the coal wall 6,
⑨, after the concrete mortar between the front and the rear arched wall boards is completely solidified, the pressure casting composite sealing wall for the underground coal mine is obtained.
The core of the invention is that a front arch wallboard and a rear arch wallboard are constructed in a roadway to be closed, then pressurized concrete is poured between the front arch wallboard and the rear arch wallboard by means of a pressurizing cylinder 10 and other devices, so that the concrete is pressurized to coal walls 6 at two ends, and the coal walls 6 at two sides are fully filled and compacted. The design of the front and rear arched wall boards increases the combination area of the composite airtight wall and the coal walls on two sides, the coal walls at the combination part are pressed more evenly, the coal stress condition is close to the center of the coal walls, and the steel wire rope stay ropes 17 increase the compression resistance of the front and rear arched wall boards.
The composite airtight wall formed in this way is tightly combined with the coal walls on two sides, and has good waterproof and sealing effects.
Claims (5)
1. The utility model provides a compound seal wall is pour with pressurization in colliery in pit, includes reinforcing bar net and spraying concrete layer, its characterized in that: the reinforcing mesh comprises a front arch reinforcing mesh and a rear arch reinforcing mesh, the front and rear arch reinforcing meshes comprise arch frames and wire netting welded on the arch frames, each arch frame is formed by welding a plurality of horizontally bent transverse rods and two vertical side rods, two rows of opposite anchor rods which are vertically arranged are respectively arranged on the coal walls on two sides of the roadway to be sealed, the front and rear arch reinforcing meshes are oppositely arranged in the roadway to be sealed under a matched coal mine,
the front arched reinforcing steel bar net and the rear arched reinforcing steel bar net are provided with through holes on two vertical side rods of an arched frame, the arched frame is fixedly fixed on the coal walls on two sides of a roadway to be sealed through the through holes and sleeved on exposed anchor rod heads on the coal walls on two sides in a one-to-one correspondence mode, the anchor rod heads are also provided with fastening nuts, the arched frame is fixedly fixed on the coal walls on two sides of the roadway to be sealed through the fastening nuts, the front arched reinforcing steel bar net is positioned on one side close to an old pond, the rear arched reinforcing steel bar net is positioned on one side far away from the old pond, a grouting pipe and an air pipe are welded on the top of the arched frame of the rear arched reinforcing steel bar net, ball valves are respectively arranged on the grouting pipe and the air pipe, a pressurizing cylinder is further arranged in the middle of the rear arched reinforcing steel bar net, a thin metal sealing disc with annular ripples is arranged at the inner end of the pressurizing cylinder, the inner end of the screw rod is abutted to the center of the circular base plate, the circular base plate is pressed on the thin metal sealing plate, the sprayed concrete layer is formed by quick-setting concrete mortar sprayed on the front arched reinforcing mesh and the rear arched reinforcing mesh, the quick-setting concrete mortar forms a front arched wallboard and a rear arched wallboard which are opposite to each other in the roadway to be sealed, concrete mortar is filled between the front arched wallboard and the rear arched wallboard, and two ends of the concrete mortar are squeezed into coal walls on two sides between the front arched wallboard and the rear arched wallboard.
2. The press-cast composite containment wall for underground coal mines according to claim 1, wherein: the arched frame of the rear arched reinforcing mesh is also welded with a metal pipe, the inner end of the metal pipe is communicated with the space between the front arched wallboard and the rear arched wallboard, and the outer end of the metal pipe is provided with a pressure gauge.
3. The underground coal mine pressure casting composite closing wall according to claim 2, characterized in that: the upper edges of the arched frames of the front and rear arched reinforcing meshes are fixed on the anchor rod heads of the top plate of the roadway to be sealed.
4. The press-cast composite containment wall for underground coal mines according to claim 3, wherein: a plurality of straight steel wire rope inhaul cables are arranged between the two vertical side rods of the front arched steel bar net, a plurality of straight steel wire rope inhaul cables are arranged between the two vertical side rods of the rear arched steel bar net, and a turn buckle with hooks at two ends is arranged.
5. The method of claim 4, comprising the steps of:
①, selecting proper coal walls with two rows of anchor rods on two sides of the coal walls in the roadway to be sealed as installation positions, cleaning loose coal blocks on the coal walls around the anchor rods,
②, taking the front arch reinforcing bar net of claim 4, making the concave surface of the front arch reinforcing bar net face the old pond of the roadway to be closed, sleeving the through holes of the vertical side bars at one side of the arch frame of the front arch reinforcing bar net on the exposed anchor heads on the coal wall at one side of the installation place in a one-to-one correspondence manner, hanging one hook of the flower basket bolt on the middle section of the adjacent steel wire rope stay, passing the other hook of the flower basket bolt on the middle section of the horizontal bar bent horizontally at the middle part of the front arch reinforcing bar net through the thick iron wire, adjusting the flower basket bolt to tighten the steel wire rope stay, thereby drawing the two vertical side bars of the front arch reinforcing bar net close,
then, aligning the through hole of the other side vertical side rod of the arched frame of the front arched steel bar net with the exposed anchor rod head on the other side coal wall, then loosening, taking down the turn buckle bolt, making the two side vertical rods of the front arched steel bar net reset under the elastic rebound action of the horizontal rod which is horizontally bent and sleeved on the anchor rod head on the other side coal wall, fastening the nut on the exposed anchor rod head sleeve, and screwing,
the arch frame is firmly fixed on the coal walls at two sides of the roadway to be sealed by the fastening nut, then the upper edge of the arch frame of the front arch reinforcing bar net is fixed on the anchor rod head of the top plate of the roadway to be sealed by thick iron wires,
③, spraying concrete with accelerating agent on the front arch reinforcing mesh and the coarse iron wire, after the concrete is solidified, the front arch reinforcing mesh and the concrete sprayed on the front arch reinforcing mesh form a front arch wallboard;
④, taking the rear arched reinforcing mesh of claim 4, arranging the rear arched reinforcing mesh opposite to the front arched reinforcing mesh, sleeving the through holes of the vertical side rods on one side of the arched frame of the rear arched reinforcing mesh on the exposed anchor heads on the adjacent coal walls in one-to-one correspondence, hanging one hook of the turn buckle on the middle section of the adjacent steel wire rope stay, connecting the other hook of the turn buckle with the cross of the pressurizing cylinder in the middle of the rear arched reinforcing mesh through thick iron wires, adjusting the turn buckle to tighten the steel wire rope stay, thereby drawing the two vertical side rods of the rear arched reinforcing mesh closer,
then, aligning the through hole of the other side vertical side rod of the arched frame of the rear arched reinforcing mesh with the exposed anchor rod head on the other side coal wall, then loosening, taking down the turn buckle bolt, making the two side vertical rods of the rear arched reinforcing mesh reset under the elastic rebound action of the horizontally bent cross rod and sleeved on the anchor rod head on the other side coal wall, fastening the nut on the exposed anchor rod head sleeve, and screwing,
the arch frame is firmly fixed on the coal walls at two sides of the roadway to be sealed by the fastening nuts, then the upper edge of the arch frame of the rear arch reinforcing mesh is fixed on the anchor rod head of the top plate of the roadway to be sealed by thick iron wires,
the hand wheel on the pressurizing cylinder of the arched reinforcing mesh is adjusted to prevent the thin metal sealing disc with the annular corrugation from being pressed,
⑤, spraying concrete mortar with accelerator on the rear arch reinforcing mesh and the coarse iron wire, forming a rear arch wallboard by the rear arch reinforcing mesh and the sprayed concrete layer thereon, wherein the grouting pipe and an air pipe are positioned at the top of the rear arch wallboard;
⑥, after the sprayed concrete layer is solidified, closing the ball valve on the grouting pipe at the top of the back arched wallboard, opening the ball valve on the air pipe, inflating air between the front arched wallboard and the back arched wallboard through the air pipe, when the pressure displayed by the pressure gauge reaches 0.2MPa, closing the ball valve on the air pipe, checking whether there is air leakage point at the periphery of the front arched wallboard and the back arched wallboard,
⑦, if there is leakage point, opening the ball valve on the air pipe, deflating, spraying concrete mortar with accelerating agent to the leakage point, after the sprayed concrete is solidified, inflating and checking leakage according to the method of step ⑥ until there is no obvious leakage point around the front arched wallboard and the back arched wallboard, proceeding to the next step,
⑧, opening the ball valve on the grouting pipe and the air pipe on the top of the back arched wallboard, injecting concrete mortar between the front arched wallboard and the back arched wallboard through the grouting pipe, closing the ball valve on the grouting pipe and the air pipe after the concrete mortar is filled, rotating the hand wheel on the pressurizing cylinder before the concrete mortar is initially set, making the screw rod prop on the circular base plate, the circular base plate extrudes the thin metal sealing plate, making the thin metal sealing plate indent, extruding the concrete mortar between the front arched wallboard and the back arched wallboard until the pressure displayed by the pressure gauge reaches 0.2MPa, extruding the coal wall between the front arched wallboard and the back arched wallboard by the extruded concrete mortar, compacting the coal wall, and filling the coal wall into the gap,
⑨, after the concrete mortar between the front and the rear arched wall boards is completely solidified, the pressure casting composite sealing wall for the underground coal mine is obtained.
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