CN116291717A - Tunnel gas storage tail end plugging structure and construction method - Google Patents
Tunnel gas storage tail end plugging structure and construction method Download PDFInfo
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- CN116291717A CN116291717A CN202310151516.5A CN202310151516A CN116291717A CN 116291717 A CN116291717 A CN 116291717A CN 202310151516 A CN202310151516 A CN 202310151516A CN 116291717 A CN116291717 A CN 116291717A
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- 238000003860 storage Methods 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 title claims description 19
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 230000000903 blocking effect Effects 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920002994 synthetic fiber Polymers 0.000 claims description 4
- 239000012209 synthetic fiber Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
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- 238000005520 cutting process Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 4
- 239000011435 rock Substances 0.000 description 23
- 230000000694 effects Effects 0.000 description 11
- 239000004568 cement Substances 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 239000011405 expansive cement Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 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
- E21F17/107—Dams, e.g. for ventilation inflatable
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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
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/007—Underground or underwater storage
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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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a tunnel gas storage tail end plugging structure, which comprises a plugging wall; the flexible mould bag is internally provided with a filling cavity, and the flexible mould bag is coated on the outer side of the plugging wall; the sealing ring is sleeved on the outer side of the flexible die bag. According to the invention, the sealing wall is built at the tail end of the roadway, the flexible mold bags are coated on the periphery of the sealing wall, so that gas leakage caused by wall cracking can be prevented, and meanwhile, the sealing rings are arranged on the periphery of the flexible mold bags, so that the overall air tightness is further improved.
Description
Technical Field
The invention relates to the field of abandoned mine gas storage, in particular to a tunnel gas storage tail end plugging structure and a construction method.
Background
Under the large background of energy conservation and emission reduction, the energy consumption structure needs to be changed, so that the consumption of fossil fuel is reduced, and the clean energy consumption ratio represented by wind energy and light energy is improved. The clean energy source has intermittence and fluctuation, and has serious influence on the stability of the power grid. In order to combine clean energy with a stable power grid, an energy storage power station is needed as a buffer reservoir to alleviate the contradiction between an unstable clean energy system and a traditional power grid system. Compressed air energy storage is one of the current large-scale energy storage technologies, and can play the role of the buffer warehouse. The existing mature gas storage forms mainly comprise an underground gas storage and a ground gas storage technology, wherein the underground gas storage comprises salt caverns, hard rock caverns and the like. Because of uneven geospatial distribution of salt rocks, in areas where wind energy and light energy are rich and suitable for building a compressed air energy storage power station, the geological structure is not necessarily present; the scale of the underground natural hard cave is smaller, and the cost of manual excavation is higher; the ground air storage tank occupies a large amount of ground space resources and consumes a large amount of steel. Therefore, the popularization and application of the compressed air energy storage are greatly limited by the reasons.
The abandoned mine has the characteristics of stable structure, large volume, regular shape and the like, is very suitable for being used as an underground gas storage space, and how to realize the complete sealing of the tail end of the abandoned mine tunnel becomes a key problem to be solved urgently at present.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a tunnel gas storage end plugging structure which can well solve the problems of complete plugging and airtightness of the tail end of a abandoned mine tunnel.
In order to achieve the above purpose, the invention provides a tunnel gas storage end plugging structure, which comprises a plugging wall; the flexible mould bag is internally provided with a filling cavity, and the flexible mould bag is coated on the outer side of the plugging wall; the sealing ring is sleeved on the outer side of the flexible die bag.
In one or more embodiments of the invention, the outer surface of the plugging wall is provided with a protrusion which can be embedded into the inner wall of the roadway.
In one or more embodiments of the present invention, the protrusion extends in a width direction of the blocking wall, and a cross section of the protrusion in a length direction of the blocking wall is triangular.
In one or more embodiments of the present invention, a plurality of the protrusions are spaced apart along the length of the blocking wall.
In one or more embodiments of the present invention, the flexible mold bag is made of synthetic fibers; and/or the sealing ring is made of rubber-plastic composite RP rubber or polytetrafluoroethylene.
In one or more embodiments of the present invention, the sealing ring has a maximum compression ratio in a thickness direction thereof of not less than 50%.
The invention also provides a construction method of the tunnel gas storage tail end plugging structure, which comprises the following steps:
s1, building a rear retaining wall;
s2, placing a flexible die bag and a sealing ring sleeved outside the flexible die bag;
s3, building a front side retaining wall reserved with a grouting opening and an exhaust hole, wherein the flexible die bag and the sealing ring are positioned between the front side retaining wall and the rear side retaining wall;
s4, injecting concrete into the flexible mold bag through the grouting opening, and forming the plugging wall after the concrete is completely solidified.
In the construction method, the method further comprises the step of cutting a sealing groove corresponding to the protrusion on the plugging wall on the inner wall of the roadway.
In the above construction method, the height of the individual protrusion is not less than 0.5 times the width of the roadway, and/or the width of the bottom of the individual protrusion is not less than 0.6 times the width of the roadway.
In the construction method, the width of the blocking wall is 1-3 times of the width of the roadway, and/or the free expansion rate of the concrete is 0.008% -0.01%, and the concrete generates a jacking force of not less than 2MPa to the periphery when being completely solidified.
Compared with the prior art, according to the end plugging structure and the construction method of the roadway gas storage, the periphery of the plugging wall is coated with the flexible mould bag, gas leakage caused by wall cracking is prevented, and the sealing ring is additionally arranged on the outer layer of the flexible mould bag, so that the overall gas tightness is further improved. The wall is also provided with a zigzag fixing structure, so that the fixing effect with surrounding rock mass is improved.
Drawings
FIG. 1 is a schematic perspective view of a terminal plugging structure for a gas storage in a roadway according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a tunnel gas reservoir end closure structure along the axial direction of a tunnel according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a tunnel gas reservoir end closure structure according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of the construction of a terminal plugging structure of a roadway gas storage according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an intermediate structure for constructing a terminal plugging structure for a gas storage in a roadway according to an embodiment of the present invention.
The main reference numerals illustrate:
100-end plugging structure of roadway gas storage, 10-plugging wall, 11-protrusion, 20-flexible mold bag, 30-sealing ring, 200-front side retaining wall, 300-rear side retaining wall, 400-roadway and 410-surrounding rock.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As shown in fig. 1 to 3, the end closure structure 100 of a gas storage in a roadway according to the preferred embodiment of the present invention includes a closure wall 10, a flexible mold pocket 20 coated on the outside of the closure wall 10, and a sealing ring 30 sleeved on the outside of the flexible mold pocket 20.
The block wall 10 is preferably made of concrete having a certain expansion characteristic during solidification in order to ensure the sealing property of the block wall as a main body for blocking the roadway 400.
The concrete is formed by mixing expansive cement, sand, stone and water according to a certain proportion, and in the embodiment, the conventional C20 (water: cement: sand: stone is 0.51:1:1.81:3.68) or C30 concrete (water: cement: sand: stone is 0.38:1:1.1:2.72) can be selected, and of course, the higher-grade concrete can also be used. It will be appreciated that the higher the concrete grade, the greater the compressive strength provided and the greater the air pressure that the air reservoir can withstand, the more energy is stored. The expansion cement does not shrink and slightly expands in the hardening process, the free expansion rate of the prepared concrete is 0.008% -0.01%, and the concrete has a jacking force of not less than 2MPa on surrounding rock when being completely coagulated.
The shape of the roadway is generally a lower rectangle, the top is provided with an arc shape, and the section of the blocking wall 10 can be provided with a rectangle corresponding to the shape. In order to ensure tightness, the cross-sectional dimension of the blocking wall 10 should be greater than the dimension of the roadway, preferably, the width L of the blocking wall 10 should be 1-3 times the width D of the roadway, and the height of the blocking wall 10 is slightly greater than the height of the roadway.
It is easily conceivable that the shape of the blocking wall 10 may be adaptively adjusted according to the shape of the roadway construction area, for example, the cross-sectional shape thereof may be a circular shape, a bottom rectangular top semicircular shape, or other abnormal shape.
In a preferred embodiment, the length of the blocking wall 10 in the roadway extending direction is determined according to the number of the protrusions 11 provided and the spacing between the adjacent protrusions 11, and is at least not smaller than the width of one protrusion 11.
In order to improve the fixing and sealing effects with surrounding rock bodies, the outer surfaces of the blocking walls 10 are respectively outwards protruded with protrusions 11, and the protrusions 11 can be embedded into surrounding rocks 410 around a roadway, so that the overall biting force of the blocking walls 10 is improved, the blocking walls 10 are firmly fixed in the roadway 400, high-pressure gas in the roadway is effectively resisted, the long-term stability of the blocking walls 10 is fully ensured, and the possibility that the high-pressure gas in the roadway leaks along surrounding rock cracks is reduced.
The protrusions 11 may protrude around the blocking wall 10 in a ring shape, or may be formed on any one or more of the upper, lower, left and right surfaces of the blocking wall 10. In a preferred embodiment, as shown in fig. 1, protrusions 11 protrude from both the upper and lower surfaces of the wall 10.
As shown in fig. 2, the cross-section of the protrusion 11 is triangular, and two protrusions are arranged at intervals along the length direction of the blocking wall 10, and have a zigzag structure. The structure further improves the biting force between the blocking wall 10 and the rock mass, improves the fixing effect, and ensures the stability of the whole structure in the long-term repeated charging and discharging process.
In order to further improve the fixing effect, the height h and the width w of the protrusion 11 are not lower than 0.5 times and 0.6 times of the roadway width D respectively, and the plugging wall needs to be penetrated into the complete surrounding rock.
It will be appreciated that depending on the size of the tunnel, the nature of the earth on the inner wall of the tunnel, the requirements of the stored gas pressure, etc., different numbers of protrusions 11 may be provided in the direction of extension of the blocking wall to meet different tightness requirements. For example, when the opening size of the roadway 400 is large, the hardness of the roadway rock is small, or the pressure of the stored gas is large, more protrusions 11 may be provided in order to meet the sealing requirement of the blocking, for example, the number may be up to 5 or more, and the protrusions 11 may be formed around the blocking wall 10 in an annular manner. In the case where the opening size of the roadway 400 is small, the rock hardness is high, or the stored gas pressure is small, only one set of projections 11 may be provided in the length direction of the blocking wall 10.
In addition, the positions where the protrusions 11 are disposed may be different for the adjacent protrusions 11 disposed at intervals, for example, for the first group of protrusions 11, they may be disposed on the upper and lower surfaces of the blocking wall 10, and for the second group of protrusions 11 adjacent thereto, they may be disposed on the left and right surfaces of the blocking wall 10.
The protrusion 11 is mainly intended to be embedded in the inner wall of the roadway 400, and its cross-sectional shape may be rectangular, M-shaped, etc., which is not limited in this embodiment.
In the technical scheme, a zigzag plugging design is formed at the top and bottom ends of the roadway 400 respectively, so that the biting force between the rock mass and the plugging wall 10 is improved, and the long-term stability of the whole plugging structure in the long-term charging and discharging cyclic load process is ensured.
The flexible form 20 is used as a container during the casting of the wall and also prevents the concrete from immersing the seal ring 30 to cause failure before the wall 10 is formed, so that the sealing and strength of the flexible form 20 are particularly high.
In the preferred embodiment, the flexible bag 20 is made of high strength, low tensile synthetic fiber filaments, which have the advantages of wear resistance, push resistance, high tensile strength, dense top, strong primary support, high resistance, air impermeability, and the like. Of course, other materials may be selected to form the flexible molding bag 20, and the present embodiment is not limited thereto.
The sealing ring 30 is preferably arranged between two adjacent protrusions 11 or on the side of the protrusions 11 close to the interior of the roadway. Thus, blocking of the sealing ring 30 in the direction of roadway extension can be achieved by the projections 11.
The sealing ring 30 is sleeved on the outer sides of the flexible die bag 20 and the plugging wall 10, so that the sealing performance between the plugging wall 10 and the inner wall of the roadway can be further improved.
In order to ensure a sealing effect, the sealing ring 30 should have a certain elastic modulus. In one embodiment, the width (the roadway length direction) of the annular sealing ring 30 is not less than 150cm, the thickness (solid, the thickness on the surface of the flexible die bag 20) of the sealing ring 30 is 5cm-10cm, and the thickness compression rate of the sealing ring is not less than 50% after the concrete is completely condensed.
Alternatively, the sealing ring 30 may be made of rubber-plastic composite RP rubber, polytetrafluoroethylene PTFE material, or other materials with high elastic modulus, high strength, wear resistance, and good chemical stability.
In this technical scheme, through placing the sealing washer between shutoff wall 10 and tunnel inner wall, make sealing washer 30 and tunnel direct contact, sealing washer 30 has better elasticity characteristic, can offset the phenomenon that leaks gas because of the crack that concrete shutoff wall 10 solidification shrink caused, uses expansion cement in the concrete material simultaneously, has further avoided the shrinkage phenomenon of concrete, very big improvement the sealed effect of structure.
Referring to fig. 3 and 4, a method for constructing the end plugging structure 100 of the gas storage in the roadway 400 at the end of the roadway is briefly described herein, and mainly comprises the following steps:
s1, combining (2) in FIG. 5, selecting an area for building the blocking wall, and building a rear retaining wall 300 on one side of the area close to the interior of the roadway 400.
S2, combining (3) in FIG. 5, placing the flexible die bag 20 and the sealing ring 30 sleeved outside the flexible die bag 20.
In the technical scheme, the flexible mould bags are used as the disposable mould for pouring concrete, so that the construction efficiency is improved, and meanwhile, the flexible mould bags have the characteristics of close top, high resistance, air impermeability and the like, and the stability of the plugging wall and the sealing performance of the contact surface with surrounding rock are further improved.
S3, combining (4) in FIG. 5, constructing a front side retaining wall 200 with a grouting opening and an exhaust hole reserved, wherein the flexible die bag 20 and the sealing ring 30 are positioned between the front side retaining wall 200 and the rear side retaining wall 300.
S4, in combination with (5) in FIG. 5, concrete is injected into the flexible mold bags 20 through the grouting openings, and the concrete is completely solidified to form the plugging wall 10.
In the technical scheme, the concrete material for plugging has certain expansibility, ensures that concrete forms certain supporting force on surrounding rock 410 after being coagulated, avoids shrinkage and dry cracking of the plugging wall 10, and simultaneously sets a sealing ring 30 with a higher elastic modulus between the plugging wall 10 and the inside of a roadway 400, thereby effectively preventing gas leakage of the contact surface of the concrete and the surrounding rock 410.
It should be noted that, if the roadway 400 has a plurality of inlets and outlets, each inlet and outlet needs to be provided with a blocking wall 10 for sealing, and the number of blocking walls 10 of each inlet and outlet may also be plural, this embodiment only describes a construction method of one blocking wall 10 of one inlet and outlet, and other blocking walls 10 are constructed in the same manner and will not be described again.
In the step S1, before or after the rear retaining wall 300 is built, the profile and the size corresponding to the to-be-built blocking wall 10 are cut on the inner wall of the roadway in the selected area, and the shape matching with the protrusion 11 is cut, for example, when the cross section of the protrusion 11 is triangular and the protrusions 11 are disposed on the upper and lower surfaces of the blocking wall 10, the grooves with triangular cross sections are cut on the upper and lower inner walls of the roadway 400 correspondingly, and the cutting mode can be a water jet mode and ensures that the flatness of the cut surface is controlled within 20 mm.
The rear retaining wall 300 is mainly used for defining the edge of the selected area close to the interior of the roadway 400, and the wall thickness and strength of the rear retaining wall can be enough that the wall is not obviously deformed or collapsed in the pouring and solidification processes of the plugging wall 10.
In the step S2, the corresponding flexible mold bag 20 and the annular seal ring 30 are manufactured according to the structural form and the size design of the plugging wall 10, the seal ring 30 is preset on the outer side of the flexible mold bag 20, and the seal ring 30 and the flexible mold bag 20 are fixed at the position of the cut selected area. The annular sealing ring 30 is separated from the concrete (the blocking wall 10) by the flexible mould bags 20, so that the sealing ring 30 is prevented from being immersed by the concrete and cannot play a role in sealing.
In the step S3, the front retaining wall 200 is constructed at the side of the selected area near the entrance/exit of the roadway 400, and the rear retaining wall 300 and the front retaining wall 200 are designed to ensure the structural shape of the flexible mold bags 20, so as to prevent the flexible mold bags 20 from being deformed in a stretching manner along the roadway 400 during grouting, so that the concrete cannot squeeze the annular sealing ring 30 and the sealing effect cannot be achieved.
In order to smoothly complete grouting, in step S3, a grouting opening (not shown) and an air vent (not shown) need to be formed in the front retaining wall 200, and gaps are reserved at the positions of the grouting opening and the air vent, respectively, so as to facilitate the injection of concrete into the flexible mold bag 20 and the removal of air in the flexible mold bag 20. Preferably, the grouting opening is formed at the bottom of the front retaining wall 200, and the exhaust hole is formed at the top of the front retaining wall 200, so as to avoid waste caused by early outflow of concrete in the filling process.
According to the technical scheme, front and rear retaining walls are built at the positions of the roadway to be blocked, flexible dies with the same size are arranged in the retaining walls, a designed annular sealing ring is sleeved on the outer side of the flexible dies, then the flexible dies are fixed on the inner wall of the roadway to be blocked, and then slurry can be filled in flexible die bags to form the roadway blocking wall.
In the above step S4, grouting may be performed when the front retaining wall 200 and the rear retaining wall 300 are completely condensed. The pumping pressure of grouting is kept between 0.5MPa and 1.5MPa when the concrete is injected into the flexible mould bag 20, and grouting can be stopped when the grouting pressure stably reaches 1.5MPa and the exhaust holes are continuously discharged with slurry. Then the grouting nozzle is pulled out slowly, and the grouting opening and the vent hole are sealed by using a plug to prevent the slurry from leaking out.
The concrete is formed by mixing expansion cement, sand, stone and water, and the shrinkage cracking phenomenon of common cement is solved due to the fact that the expansion cement does not shrink and slightly expands in the hardening process. The prepared concrete has a free expansion rate of 0.008% -0.01%, so that when the concrete is completely coagulated, a jacking force of 2-3 MPa is exerted on the surrounding rock 410, and the flexible die bag 20, the annular sealing ring 30 and the surrounding rock 410 are tightly attached to realize a complete sealing effect. When the gas pressure in the roadway 400 is 10MPa, the requirements of gas storage stability and tightness of the roadway are met. Surrounding rocks of other inlets and outlets of the roadway are constructed by the same construction method, and the construction effects are the same.
In summary, the invention provides the end blocking structure and the method for the abandoned mine tunnel gas storage, which are suitable for blocking design and construction of gas, water and fire in underground mine tunnels, and are particularly suitable for blocking design and construction of the end sealing property of the abandoned mine tunnel gas storage based on compressed air energy storage. The requirements of the stability and the tightness of the plugging structure of the compressed air energy storage warehouse under the load circulation effect of approximately 10MPa can be met, and the purposes of reducing the cost, improving the quality and improving the effect of the plugging of the tail end of the roadway are achieved.
In addition, the plugging structure and the method for the tunnel tail end are characterized in that the flexible die bags made of the synthetic fibers with the characteristics of high strength, low stretching, dense top, high resistance and the like are used for replacing concrete to be in direct contact with surrounding rocks, so that the possibility of gas leakage of the surrounding rock contact surface is greatly reduced, the sealing rings of high strength and high elastic dies are arranged on the periphery of the flexible die bags, and after the concrete with certain strength is injected into the flexible die bags, the surrounding rock contact surface can be completely sealed; meanwhile, the plugging wall at the tail end of the roadway is arranged into a zigzag structure, so that the biting force of concrete and rock mass is improved, and the long-term stability of the plugging wall is enhanced.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a tunnel gas storage end shutoff structure which characterized in that includes:
a blocking wall;
the flexible mould bag is internally provided with a filling cavity, and the flexible mould bag is coated on the outer side of the plugging wall;
the sealing ring is sleeved on the outer side of the flexible die bag.
2. The end plugging structure of a gas storage in a roadway as claimed in claim 1, wherein the outer surface of the plugging wall is provided with protrusions capable of being embedded into the inner wall of the roadway.
3. The terminal plugging structure of a gas storage in a roadway as claimed in claim 2, wherein the protrusion extends in a width direction of the plugging wall, and a cross section of the protrusion in a length direction of the plugging wall is triangular.
4. The terminal plugging structure for a gas storage in a roadway as claimed in claim 2, wherein a plurality of said protrusions are spaced apart along the length of said plugging wall.
5. The end plugging structure of a roadway gas storage as recited in claim 1, wherein said flexible molded bag is made of synthetic fibers; and/or the sealing ring is made of rubber-plastic composite RP rubber or polytetrafluoroethylene.
6. The terminal plugging structure for a gas storage in a roadway as claimed in claim 1, wherein the sealing ring has a maximum compression ratio in a thickness direction thereof of not less than 50%.
7. A method for constructing a terminal plugging structure of a gas storage in a roadway based on any one of claims 1 to 6, comprising the steps of:
s1, building a rear retaining wall;
s2, placing a flexible die bag and a sealing ring sleeved outside the flexible die bag;
s3, building a front side retaining wall reserved with a grouting opening and an exhaust hole, wherein the flexible die bag and the sealing ring are positioned between the front side retaining wall and the rear side retaining wall;
s4, injecting concrete into the flexible mold bag through the grouting opening, and forming the plugging wall after the concrete is completely solidified.
8. The method of construction of claim 7, further comprising cutting a seal groove corresponding to the protrusion on the blocking wall into the inner wall of the roadway.
9. The method of construction according to claim 8, wherein the height of the individual protrusions is not less than 0.5 times the width of the roadway and/or the width of the bottoms of the individual protrusions is not less than 0.6 times the width of the roadway.
10. The construction method according to claim 7, wherein the width of the blocking wall is 1 to 3 times the width of the roadway, and/or the free expansion rate of the concrete is 0.008 to 0.01%, and the concrete generates a jacking force of not less than 2MPa to the surroundings when completely solidified.
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| CN202310151516.5A CN116291717A (en) | 2023-02-22 | 2023-02-22 | Tunnel gas storage tail end plugging structure and construction method |
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| CN202310151516.5A CN116291717A (en) | 2023-02-22 | 2023-02-22 | Tunnel gas storage tail end plugging structure and construction method |
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| CN110017167A (en) * | 2019-04-22 | 2019-07-16 | 安徽佳泰矿业科技有限公司 | A kind of coal mine explosion-proof fire dam and its construction method |
| CN111764958A (en) * | 2020-06-08 | 2020-10-13 | 宁夏久威矿山安全工程有限责任公司 | Lower port blocking structure of branch roadway and construction method |
| CN217582236U (en) * | 2022-07-14 | 2022-10-14 | 国家能源集团宁夏煤业有限责任公司 | Water retaining dam for mine water |
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2023
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| CN109356650A (en) * | 2017-10-25 | 2019-02-19 | 中国矿业大学 | A method of compressed-air energy storage is carried out using coal mine down-hole tunnel |
| CN110017167A (en) * | 2019-04-22 | 2019-07-16 | 安徽佳泰矿业科技有限公司 | A kind of coal mine explosion-proof fire dam and its construction method |
| CN111764958A (en) * | 2020-06-08 | 2020-10-13 | 宁夏久威矿山安全工程有限责任公司 | Lower port blocking structure of branch roadway and construction method |
| CN217582236U (en) * | 2022-07-14 | 2022-10-14 | 国家能源集团宁夏煤业有限责任公司 | Water retaining dam for mine water |
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Application publication date: 20230623 |