CN110080822B - Underground rock cave gas storage and concrete lining parting gas leakage prevention structure - Google Patents
Underground rock cave gas storage and concrete lining parting gas leakage prevention structure Download PDFInfo
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- CN110080822B CN110080822B CN201910343153.9A CN201910343153A CN110080822B CN 110080822 B CN110080822 B CN 110080822B CN 201910343153 A CN201910343153 A CN 201910343153A CN 110080822 B CN110080822 B CN 110080822B
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- 230000002265 prevention Effects 0.000 title claims abstract description 14
- 239000011435 rock Substances 0.000 title claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 90
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 27
- 239000004927 clay Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims 2
- 230000007774 longterm Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 40
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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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)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses an underground rock cavern gas storage and concrete lining joint-parting gas permeation prevention structure. The air-leakage-proof structure comprises a groove arranged at a seam opening of the concrete lining parting and a sealing strip positioned in the groove; a cover plate is arranged at the notch of the groove, and filling materials are filled among the wall surface of the groove, the cover plate and the outer wall surface of the sealing strip; be provided with first spring and second spring in the sealing strip, and the both ends of first spring and second spring all sticiss on the inner wall of sealing strip. The invention solves the problem of insufficient long-term sealing efficiency of the existing lining parting sealing treatment structure of the underground gas storage.
Description
Technical Field
The invention relates to an underground cavern gas storage and concrete lining parting gas leakage prevention structure, in particular to a high-pressure gas sealing and leakage prevention device used in the fields of cavern type underground gas storage engineering of a compressed air energy storage power station, large-scale natural gas underground cavern gas storage engineering and the like, and particularly relates to a device for sealing high-pressure compressed gas with frequent high-pressure and low-pressure alternating change.
Background
Under the prior art, the cave-type underground gas storage adopts low-permeability or impermeable materials (3 steel plates, rubber plates or plastic plates) as the materials of the sealing layers, and the lining (5) behind the sealing layers generally adopts integrally cast concrete as the force transmission structure layers of the sealing layers. The pressure of compressed air underground gas storage is generally as high as 7.0-10MPa or even higher, while the pressure of natural gas underground gas storage can be as high as more than 20 MPa. Under the action of huge internal pressure of the gas storage, cracks are inevitable on a concrete lining of the gas storage; concrete cracks produce durability which is not conducive to the structural safety of the sealing layer on the one hand, and also adversely affect the overall sealing effect of the gas storage.
The concrete lining behind the sealing layer adopts a pre-splitting and parting treatment mode (figure 1), so that the tensile stress in the concrete lining can be greatly reduced or eliminated, and the cracking of the concrete lining is avoided to the greatest extent. In order to prevent high-pressure gas from leaking from the parting position, the underground gas storage is subjected to joint-to-joint backfill treatment besides continuous and integral installation of a sealing layer, and at present, backfill materials for concrete parting sealing treatment at home and abroad generally adopt organic materials such as rubber or plastics and the like, and the materials have the advantages of good resilience performance in a short period and good sealing performance. Research shows that rubber or plastic used as a sealing layer or a filling material between seams is easy to age and poor in durability, and the resilience performance of the rubber or plastic is quickly attenuated in the working state of gas pressure alternating change in gas storage, so that the sealing performance of the lining gap in the opening working state is weakened, and even the sealing failure of an underground gas storage is caused. On the other hand, the backfill performance of the O-shaped metal sealing strip with good durability is greatly reduced in the later period of use under the action of long-term frequent alternating pressure. Although high-pressure gas can be filled in the O-shaped metal sealing strip to enhance the resilience performance of the O-shaped metal sealing strip, the process for filling the high-pressure gas is complex, and the risk of gas leakage is high.
Disclosure of Invention
The invention aims to provide an underground cavern gas storage and concrete lining parting gas permeation prevention structure, aiming at solving the problem that the existing lining parting sealing treatment structure of the underground gas storage is insufficient in long-term sealing efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
a concrete lining parting air-leakage-proof structure is structurally characterized by comprising a groove arranged at a seam opening of the concrete lining parting and an O-shaped sealing strip positioned in the groove and used as a primary anti-leakage structure;
a cover plate for locking the sealing strip in the groove is arranged at the notch of the groove, and filling materials serving as a secondary anti-seepage structure are filled among the wall surface of the groove, the cover plate and the outer wall surface of the sealing strip;
a first spring and a second spring are arranged in the O-shaped sealing strip, the first spring is vertically arranged relative to the second spring, and two ends of the first spring and two ends of the second spring are tightly pressed on the inner wall of the O-shaped sealing strip, so that the side wall sealing surface of the O-shaped sealing strip tightly presses the seam opening of the concrete lining parting.
From this, keep the sealing performance of sealing strip through the spring, extrude the sealing strip through the spring simultaneously, further extrude the filling to guarantee to be in effective sealed state all the time.
In addition, the first spring is arranged vertically relative to the second spring, so that the resilience of the sealing strip under the action of pressure alternation can be effectively improved, and the service life of the sealing strip is prolonged.
The sealing strip is preferably an o-shaped metal sealing strip.
The invention eliminates the adverse effect of the resilience performance reduction and even disappearance of the backfill materials among the joints of the concrete lining joints in the alternate opening and closing state on the sealing performance of the joint structure, and simultaneously can fully utilize the low permeability of the concrete among the pre-cracks as the second sealing line of the underground gas storage, thereby obviously improving the self-resilience sealing characteristic of the concrete lining joint sealing structure.
According to the embodiment of the invention, the invention can be further optimized, and the following is the technical scheme formed after optimization:
in one preferred embodiment, the first spring is disposed perpendicular to the concrete lining split and the second spring is disposed along the concrete lining split.
In one preferred embodiment, the number of the first springs is two, and the number of the second springs is one.
In one preferred embodiment, the O-shaped sealing strip is cylindrical in shape.
In one preferred embodiment, the left and right ends of the cover plate are provided with bolt holes, and the cover plate is fixed at the joint of the two concrete linings through bolts penetrating through the bolt holes.
In one preferred embodiment, in order to further improve the seepage-proofing performance of the concrete lining joint, a three-stage seepage-proofing structure is installed inside the concrete lining joint; preferably, the three-stage seepage-proofing structure is a moisture absorption expansion type clay rod which is vertically arranged.
In one preferred embodiment, the width of the groove is 80-100mm, and the depth of the groove is 60-80 mm; the wall thickness of the sealing strip is 0.5mm-1mm, the outer diameter is 80-100mm, and the length is 3m-6 m.
Based on the same invention concept, the invention also provides an underground rock cavern gas storage, which comprises gas storage surrounding rocks, a plurality of concrete linings built close to the inner wall surfaces of the gas storage surrounding rocks, and concrete lining parting formed between two adjacent concrete linings; and the joint of one side of each two adjacent concrete linings facing the gas storage area is provided with the concrete lining parting gas-permeation-preventing structure.
In one preferred embodiment, a plurality of concrete linings surround to form a cylindrical structure, and the concrete lining parting air-permeability-preventing structures are circumferentially distributed on the inner wall surface of the cylindrical structure.
In order to further improve the anti-seepage performance, the side of the concrete lining facing the gas storage area is covered by an integral sealing layer.
Compared with the prior art, the invention has the beneficial effects that:
1. the sealing structure material of the invention totally adopts inorganic metal or nonmetal materials, has strong durability, can overcome the defects of easy aging and insufficient durability of the conventional sealing material which adopts organic high-elastic sealing materials (rubber or plastic plates and the like), and solves the problem of insufficient long-term sealing efficiency of the lining parting sealing treatment structure.
2. The sealing structure of the invention adopts the O-shaped metal sealing strip with the built-in compression spring to provide the rebound power, enhances the elasticity of the O-shaped metal sealing strip, can keep the initial pressure required by the sealing structure for a long time, and overcomes the defects of easy air leakage and complex inflation process caused by the enhancement of the inflation in the conventional sealing strip.
3. The sealing structure can be disassembled and reinstalled, and has strong replaceability. The device has reasonable design, simple structure and convenient operation.
4. The invention provides another technical support for promoting the progress of the sealing technology of the large-scale underground gas storage engineering.
Drawings
FIG. 1 is a schematic illustration of a concrete lining parting location according to the present invention;
FIG. 2 is a schematic view of the lining parting seepage-proofing structure.
In the figure
1-lining parting filling; 2-lining parting; 3-integral sealing layer; 4-concrete lining; 5-leveling concrete; 6-surrounding rock of the gas storage; 7-sealing strips; 8-a first spring; 9-filling material; 10-a cover plate; 11-expansion bolts; 12-bolt holes; 13-a hygroscopic expansive clay rod; 14-a second spring; 15-groove.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
An underground cavern gas storage is disclosed, as shown in figure 1, and comprises a gas storage surrounding rock 6, a plurality of concrete linings 4 which are built tightly close to the inner wall surface of the gas storage surrounding rock 6, and concrete lining parting 2 is formed between two adjacent concrete linings 4; a plurality of concrete linings 4 surround to form a tubular structure, and the concrete lining parting air-permeability-preventing structures are circumferentially distributed on the inner wall surface of the tubular structure. And concrete lining joint air leakage prevention structures are arranged at the joint of one sides of the two adjacent concrete linings 4 facing the air storage area. In order to further increase the barrier properties, the concrete lining 4 is covered on the side facing the air storage area by an integral sealing layer 3.
As shown in fig. 2, the concrete lining parting air-permeation preventing structure includes a groove 15 provided at the joint of the concrete lining parting 2, and an o-shaped seal strip 7 provided in the groove 15. And a cover plate 10 for locking the sealing strip 7 in the groove 15 is arranged at the notch of the groove 15, and filling materials 9 are filled among the wall surface of the groove 15, the cover plate 10 and the outer wall surface of the sealing strip 7. A first spring 8 and a second spring 14 are arranged in the O-shaped sealing strip 7, the first spring 8 is vertically arranged relative to the second spring 14, and both ends of the first spring 8 and the second spring 14 are tightly pressed on the inner wall of the O-shaped sealing strip 7, so that the side wall sealing surface of the O-shaped sealing strip 7 is tightly pressed on the seam of the concrete lining parting seam 2. For better support, the first spring 8 is arranged perpendicular to the concrete lining parting 2 and the second spring 14 is arranged along the concrete lining parting 2. In this embodiment, there are two first springs 8, and one second spring 14.
Bolt holes are formed in the left end and the right end of the cover plate 10, and the cover plate 10 is fixed to the joint of the two concrete linings 4 through bolts 11 penetrating through the bolt holes.
The concrete lining parting 2 is internally provided with a moisture absorption expansion type clay rod 13 which is vertically arranged. Of course, other impervious structures, such as water stops, etc., may be provided.
As shown in figure 2, a groove 15 is arranged on one side of the concrete lining facing the gas storage cavity of the gas storage, the width of the groove 15 is 80-100mm, and the depth of the groove 15 is 60-80 mm. An elastic O-shaped metal sealing strip 7 for preventing gas permeation is arranged in the groove 15, low-permeability plastic expansive clay is filled between the groove 15 and the O-shaped metal sealing strip 7 to serve as a filling material 9, a steel strip sealing cover plate is arranged on the outer side of the O-shaped metal sealing strip 7, prestress is applied to the O-shaped metal sealing strip 7 through a pre-tightening expansion bolt 11, the O-shaped metal sealing strip 7 deforms under the action of the prestress, on one hand, the O-shaped metal sealing strip is in close contact with the wall surface of the groove 15 through extrusion, on the other hand, the compactness of the filling clay is increased through the extrusion expansive filling clay, and therefore sealing of the concrete lining parting joint 2 is achieved. The expansion bolts 11 of this embodiment are preferably corrosion-resistant stainless steel bolts.
In order to improve the resilience of the O-shaped metal sealing strip 7 under the alternating action of pressure and prolong the service life of the O-shaped metal sealing strip 7, a first spring 8 and a second spring 14 are arranged inside the O-shaped metal sealing strip 7, wherein the first spring 8 is a transverse set of 2 stainless steel compression springs, and the second spring 14 is a longitudinal set of 2 stainless steel compression springs. The O-shaped metal sealing strip 7 is provided with initial pressure by the metal cover plate 10, energy is stored in the stainless steel compression spring, and the O-shaped metal sealing strip 7 is provided with power for rebounding. The cover plate 10 is provided with bolt holes with two ends in arc shapes and a rectangular middle part to allow small-amplitude sliding deformation between the cover plate 10 and the concrete.
In order to improve the reliability of the sealing effect, the moisture absorption expansion type clay rod 13 is installed inside the concrete lining parting 2, and the moisture absorption expansion low-permeability performance of the moisture absorption expansion type clay rod 13 is utilized to further prevent gas from leaking along the concrete lining parting 2. The cover plate 10 used in this embodiment is preferably a corrosion-resistant stainless steel pre-stressed cover plate.
The sealing strip 7 is cylindrical as a whole. The O-shaped metal sealing strip 7 has a wall thickness of 0.5mm-1mm, an outer diameter of 80-100mm and a length of 3m or 6 m.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (9)
1. A concrete lining parting air-seepage-proof structure is characterized by comprising a groove (15) arranged at a seam opening of a concrete lining parting (2), and an O-shaped metal sealing strip (7) which is positioned in the groove (15) and is used as a primary seepage-proof structure;
a cover plate (10) for locking the sealing strip (7) in the groove (15) is arranged at the notch of the groove (15), and filling materials (9) serving as a secondary anti-seepage structure are filled among the wall surface of the groove (15), the cover plate (10) and the outer wall surface of the O-shaped metal sealing strip (7);
a first spring (8) and a second spring (14) are arranged in the O-shaped metal sealing strip (7), the first spring (8) is vertically arranged relative to the second spring (14), and two ends of the first spring (8) and two ends of the second spring (14) are tightly pressed on the inner wall of the O-shaped metal sealing strip (7), so that the side wall sealing surface of the O-shaped metal sealing strip (7) is tightly pressed on the seam of the concrete lining parting seam (2);
a three-stage seepage-proofing structure is arranged inside the concrete lining parting (2); the three-stage seepage-proofing structure is a moisture absorption expansion type clay rod (13) which is vertically arranged.
2. A concrete lining parting air permeation prevention construction according to claim 1, wherein the first spring (8) is disposed perpendicular to the concrete lining parting (2), and the second spring (14) is disposed along the concrete lining parting (2).
3. A concrete lining parting air permeation prevention structure according to claim 2, wherein there are two of said first springs (8) and one of said second springs (14).
4. A concrete lining parting air permeation prevention structure according to any one of claims 1 to 3, wherein the o-shaped metal seal strip (7) is cylindrical as a whole.
5. A concrete lining parting air permeation prevention structure according to any one of claims 1 to 3, wherein bolt holes are opened at both left and right ends of the cover plate (10), and the cover plate (10) is fixed at the joint of two concrete linings (4) by bolts (11) passing through the bolt holes.
6. A concrete lining parting air permeation prevention construction according to any one of claims 1 to 3, wherein the groove (15) is 80-100mm wide and the groove (15) is 60-80mm deep; the O-shaped metal sealing strip (7) has a wall thickness of 0.5mm-1mm, an outer diameter of 80-100mm and a length of 3m-6 m.
7. An underground rock cave gas storage comprises gas storage surrounding rocks (6), a plurality of concrete linings (4) which are built by clinging to the inner wall surfaces of the gas storage surrounding rocks (6), and concrete lining parting joints (2) are formed between every two adjacent concrete linings (4); characterized in that the joint of the sides of the two adjacent concrete linings (4) facing the gas storage area is provided with the concrete lining joint air-permeation prevention structure according to any one of claims 1 to 6.
8. An underground cavern gas storage as claimed in claim 7, wherein a plurality of concrete linings (4) surround to form a tubular structure, the concrete lining parting gas permeation prevention structures being circumferentially distributed at an inner wall surface of the tubular structure.
9. An underground cavern gas storage as claimed in claim 7 or 8, characterized in that the concrete lining (4) is covered on the side facing the gas storage area by an integral sealing layer (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910343153.9A CN110080822B (en) | 2019-04-26 | 2019-04-26 | Underground rock cave gas storage and concrete lining parting gas leakage prevention structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910343153.9A CN110080822B (en) | 2019-04-26 | 2019-04-26 | Underground rock cave gas storage and concrete lining parting gas leakage prevention structure |
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| CN110080822A CN110080822A (en) | 2019-08-02 |
| CN110080822B true CN110080822B (en) | 2021-07-06 |
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| CN115324647A (en) * | 2022-08-26 | 2022-11-11 | 中国矿业大学 | Underground rock cavern gas storage composite lining sealing structure and construction method thereof |
| CN115854257A (en) * | 2022-12-15 | 2023-03-28 | 中国电建集团西北勘测设计研究院有限公司 | Gas storage sealing device and method |
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| CN202791331U (en) * | 2012-08-03 | 2013-03-13 | 中国水电顾问集团华东勘测设计研究院 | Composite air-tight structure of underground gas storage cavern |
| CN205578004U (en) * | 2016-01-28 | 2016-09-14 | 杭州建工建材有限公司 | Tunnel segment connection structure of high strength |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203420217U (en) * | 2013-08-06 | 2014-02-05 | 安徽尚德科技有限公司 | Bridge expansion device with stainless springs pre-tightened and sealed |
| CN203755553U (en) * | 2013-12-31 | 2014-08-06 | 叶长青 | Accessible roofing diving joint |
| CN207634001U (en) * | 2017-10-31 | 2018-07-20 | 东莞市美年红精密压铸有限公司 | One kind being convenient for fixed aluminium section bar rubber weather strip |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202791331U (en) * | 2012-08-03 | 2013-03-13 | 中国水电顾问集团华东勘测设计研究院 | Composite air-tight structure of underground gas storage cavern |
| CN102768052A (en) * | 2012-08-10 | 2012-11-07 | 浙江苍南仪表厂 | Novel device for measuring flange pressure tapping flows |
| CN205578004U (en) * | 2016-01-28 | 2016-09-14 | 杭州建工建材有限公司 | Tunnel segment connection structure of high strength |
| CN108331030A (en) * | 2018-03-22 | 2018-07-27 | 深圳蓝盾防水构造技术有限公司 | Prefabricated assembled concrete piping lane seam waterproof constructs and engineering method |
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