CN115977263A - Air stopping belt suitable for sealing layer expansion joint - Google Patents
Air stopping belt suitable for sealing layer expansion joint Download PDFInfo
- Publication number
- CN115977263A CN115977263A CN202211625973.5A CN202211625973A CN115977263A CN 115977263 A CN115977263 A CN 115977263A CN 202211625973 A CN202211625973 A CN 202211625973A CN 115977263 A CN115977263 A CN 115977263A
- Authority
- CN
- China
- Prior art keywords
- protrusion
- expansion joint
- sealing layer
- bulge
- belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 72
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 4
- 238000010030 laminating Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Landscapes
- Building Environments (AREA)
Abstract
The invention discloses an air stop belt suitable for a sealing layer expansion joint, which comprises a belt body, and a first bulge and a second bulge which are arranged on the belt body, wherein the first bulge and the second bulge are both of hollow structures. When the expansion joint is applied to the expansion joint of the concrete sealing layer of the gas storage warehouse, the gas stop band is arranged along the length direction of the expansion joint, the first protrusion and the second protrusion can enter the groove of the concrete sealing layer, the cambered surfaces of the first protrusion and the second protrusion are in contact with the concrete sealing layer, deformation is generated under the action of pressure to increase the contact area, and the sealing effect can be further enhanced; when the expansion joint takes place to open and shut and warp, the only gas zone that the rubber material was made can take place deformation along with the expansion joint, and first protruding and the bellied hollow structure of second can make only gas zone produce tensile and compressive deformation equally, adapts to the deformation of expansion joint, keeps closely laminating with the concrete seal all the time simultaneously, guarantees only the gas effect, improves the operational reliability in only gas zone, and then improves the leakproofness of gas storage storehouse.
Description
Technical Field
The invention relates to the technical field of gas storage and peripheral supporting facilities thereof, in particular to a gas stop belt suitable for a sealing layer expansion joint.
Background
Compressed air energy storage is a novel energy storage technology, and is characterized in that energy generated by compressing air by utilizing off-peak electricity is utilized during off-peak electricity utilization, and the compressed air is utilized to generate electricity during the peak period of the electricity utilization, so that the purpose of energy storage is achieved. The key of the compressed air energy storage is a high-pressure air storage bank of the compressed air, and the key of the success or failure of the high-pressure air storage bank is the tightness of the air storage bank.
At present, salt cavities are mostly used as gas storage reservoirs of compressed air, the self sealing performance of the salt cavities is good, and special sealing materials are not needed; the steel plate is also used as a sealing material, and the steel plate can form a sealing system by itself after being directly welded. However, these high-pressure gas reservoirs are expensive and have poor economics. In order to be economical and applicable, at the present stage, an underground deep-buried artificial cavern is used as a high-pressure gas storage of compressed air, low-modulus concrete is used as a sealing layer, and as the gas storage has a large volume, in order to prevent the sealing layer from cracking and leaking gas under the high-pressure and temperature-variable circulation action of high-pressure gas, the sealing layer concrete needs to be provided with expansion joints to adapt to the deformation of the sealing layer concrete.
Because the expansion joint is an air leakage joint which is communicated from inside to outside, air leakage prevention treatment is needed, and no special air leakage prevention part for the expansion joint is arranged in the prior art, so that the reliability of the expansion joint is reduced, and the tightness of the air storage is influenced.
Therefore, how to change the current situation that the sealing performance of the gas storage is affected by the poor sealing performance of the expansion joint of the concrete sealing layer of the gas storage in the prior art becomes a problem to be solved urgently by the technical staff in the field.
Disclosure of Invention
The invention aims to provide an air stop belt suitable for an expansion joint of a sealing layer, so as to solve the problems in the prior art, improve the reliability of the expansion joint of the concrete sealing layer and ensure the sealing property of an air storage.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an air stop belt suitable for a sealing layer expansion joint, which comprises a belt body and a plurality of air stop plates, wherein the air stop plates are arranged on the belt body:
the number of the first bulges is two, and the two first bulges are respectively arranged on two sides of the belt body;
the number of the second bulges is at least one, and the second bulges are arranged between the two first bulges;
the first protrusion and the second protrusion are both strip-shaped structures and extend along the length direction of the belt body, one sides of the first protrusion and the second protrusion, which are far away from the belt body, are both arc surfaces, and the first protrusion and the second protrusion are both hollow structures; and the first protrusion and the second protrusion can extend into the groove of the sealing layer.
Preferably, the height of the first protrusion is greater than the height of the second protrusion.
Preferably, the cross section of the first protrusion and the cross section of the second protrusion are both semicircular, and the radius of the cross section of the first protrusion is larger than that of the cross section of the second protrusion.
Preferably, the circle center of the cross section of the first protrusion and the circle center of the cross section of the second protrusion are both located on the plane where the top surface of the belt body is located.
Preferably, the first protrusion has a first hollow portion, the second protrusion has a second hollow portion, and the first hollow portion and the second hollow portion are both cylindrical structures.
Preferably, the diameter of the first hollow portion is larger than the diameter of the second hollow portion.
Preferably, the axis of the first hollow portion is located at the top of the belt body, and the axis of the second hollow portion is located on the plane of the top surface of the belt body.
Preferably, the number of the second protrusions is multiple, and the second protrusions are arranged in parallel at equal intervals.
Preferably, the minimum distance between the first protrusion and the second protrusion is greater than the distance between two adjacent second protrusions.
Preferably, the belt body is a belt-shaped structure with a rectangular cross section, and the joint of the belt body and the first protrusion is subjected to rounding treatment.
Compared with the prior art, the invention has the following technical effects: the invention discloses an air stop belt suitable for a sealing layer expansion joint, which comprises a belt body, and first bulges and second bulges which are arranged on the belt body, wherein the number of the first bulges is two, and the two first bulges are respectively arranged on two sides of the belt body; the number of the second bulges is at least one, and the second bulges are arranged between the two first bulges; the first bulge and the second bulge are both strip-shaped structures and extend along the length direction of the belt body, one sides of the first bulge and the second bulge, which are far away from the belt body, are both cambered surfaces, and the first bulge and the second bulge are both hollow structures; and the first protrusion and the second protrusion can extend into the groove of the sealing layer.
The gas stopping belt suitable for the expansion joint of the sealing layer is arranged along the length direction of the expansion joint when being applied to the expansion joint of a concrete sealing layer of a gas storage, the first bulge and the second bulge can enter the groove of the concrete sealing layer, the belt body is also contacted with the concrete sealing layer, the belt body, the first bulge and the second bulge are tightly contacted with the concrete sealing layer under the action of gas pressure in the gas storage to block the expansion joint, leakage at the expansion joint is avoided, the cambered surfaces of the first bulge and the second bulge are contacted with the concrete sealing layer, deformation is generated under the action of pressure to increase the contact area, and the sealing effect can be further enhanced; when the expansion joint is expanded, closed and deformed, the air stopping belt made of rubber materials can deform along with the expansion joint, the hollow structures of the first bulge and the second bulge can also enable the air stopping belt to be stretched and compressed to deform so as to adapt to the deformation of the expansion joint, and meanwhile, the air stopping belt is always tightly attached to the concrete sealing layer, so that the air stopping effect is ensured; in addition, the gas stop belt is provided with the first protrusion and the second protrusion, and the first protrusion and the second protrusion are matched with the groove of the concrete sealing layer, so that the purpose of fixing the position of the gas stop belt can be realized, the working reliability of the gas stop belt is improved, and the sealing performance of the gas storage is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a sectional structure diagram of the airtight belt suitable for the sealing layer expansion joint of the present invention.
Wherein, 1 is taking the body, 2 is first arch, 3 is the second arch, 4 is first hollow portion, and 5 is the second hollow portion.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an air stop belt suitable for an expansion joint of a sealing layer, so as to solve the problems in the prior art, improve the reliability of the expansion joint of the concrete sealing layer and ensure the sealing property of an air storage.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, fig. 1 is a schematic sectional view of an airtight belt suitable for a sealing layer expansion joint according to the present invention.
The invention provides an air stopping belt suitable for a sealing layer expansion joint, which comprises a belt body 1, and a first bulge 2 and a second bulge 3 which are arranged on the belt body 1, wherein the number of the first bulges 2 is two, and the two first bulges 2 are symmetrically arranged on two sides of the belt body 1 by taking the central line of the belt body 1 in the length direction as an axis; the number of the second bulges 3 is at least one, and the second bulges 3 are arranged between the two first bulges 2; the first protrusions 2 and the second protrusions 3 are of strip-shaped structures and extend along the length direction of the belt body 1, the first protrusions 2 and the second protrusions 3 are arranged on the same side of the belt body 1 in a protruding mode, one sides, far away from the belt body 1, of the first protrusions 2 and the second protrusions 3 are arc surfaces, and the first protrusions 2 and the second protrusions 3 are of hollow structures; and the first protrusion 2 and the second protrusion 3 can extend into the groove of the sealing layer.
The gas stopping belt suitable for the expansion joint of the sealing layer is arranged along the length direction of the expansion joint when being applied to the expansion joint of a concrete sealing layer of a gas storage, the first bulge 2 and the second bulge 3 can enter the groove of the concrete sealing layer, the belt body 1 is contacted with the concrete sealing layer, under the action of gas pressure in the gas storage, the belt body 1, the first bulge 2 and the second bulge 3 are tightly contacted with the concrete sealing layer for plugging, the leakage of the expansion joint is avoided, the cambered surfaces of the first bulge 2 and the second bulge 3 are contacted with the concrete sealing layer, the expansion joint deforms under the action of the pressure to increase the contact area, and the sealing effect can be further enhanced; when the expansion joint is expanded, closed and deformed, the air stop belt made of rubber materials can deform along with the expansion joint, the air stop belt can also be made of other elastic materials, the hollow structures of the first bulge 2 and the second bulge 3 also ensure that the air stop belt can be stretched and compressed to deform so as to adapt to the deformation of the expansion joint, and meanwhile, the air stop belt is always tightly attached to a concrete sealing layer so as to ensure the air stop effect; in addition, the first bulge 2 and the second bulge 3 are arranged on the air stop belt body 1, and the first bulge 2 and the second bulge 3 are matched with the groove of the concrete sealing layer, so that the purpose of fixing the position of the air stop belt can be realized, the working reliability of the air stop belt is improved, and the sealing performance of the air storage is further improved. It should be explained here that, when the groove of the concrete sealing layer is used for installing the airtight belt, the size of the groove formed on the concrete sealing layer is not larger than the size of the first protrusion 2 and the second protrusion 3, so that the airtight belt is convenient to install and fix.
In this embodiment, first arch 2 highly is greater than the protruding 3 height of second, and two first archs 2 are located the both ends of taking body 1, and first arch 2 and concrete seal closely contact, hollow structure have guaranteed first arch 2's deformability, and under the pressure effect, the gap between body 1 and the concrete seal is taken in two first protruding 2 shutoff to avoid gas to leak by expansion joint department. In practical application, the second protrusion 3 can be arranged at the expansion joint (when a plurality of second protrusions 3 are arranged, one of the second protrusions 3 is used for plugging the expansion joint), the first protrusion 2 is added with a plurality of seals, and the first protrusion 2 and the second protrusion 3 are matched with each other to further ensure the sealing reliability of the air stop belt.
The cross section of the first protrusion 2 and the cross section of the second protrusion 3 are both semicircular, the radius of the cross section of the first protrusion 2 is larger than that of the cross section of the second protrusion 3, in the specific embodiment, the radius of the cross section of the first protrusion 2 is 4cm, and the radius of the cross section of the second protrusion 3 is 2cm. It should be noted here that the cross section refers to a sectional shape of the first protrusion 2 and the second protrusion 3 taken in a direction perpendicular to the length direction of the air stop belt.
It should be further noted that the circle center of the cross section of the first protrusion 2 and the circle center of the cross section of the second protrusion 3 are both located on the plane where the top surface of the belt body 1 is located, so that the mounting and positioning difficulty of the airtight belt is reduced, and the operation convenience of the airtight belt is improved.
Specifically, the first protrusion 2 has a first hollow portion 4, the second protrusion 3 has a second hollow portion 5, the first hollow portion 4 and the second hollow portion 5 are both cylindrical structures, when the expansion joint is expanded, closed and deformed, the first hollow portion 4 and the second hollow portion 5 are extruded or stretched to deform, so that the gas-stop belt can adapt to the expansion and closing deformation of the expansion joint.
In addition, the diameter of first hollow portion 4 is greater than the diameter of the hollow portion 5 of second, and when the expansion joint takes place to open and shut and warp, the distance of first arch 2 and expansion joint is far away than the distance of the protruding 3 of second and expansion joint, and the deformation that probably takes place is great, consequently, the diameter that sets up first hollow portion 4 is great, satisfies the deformation requirement of first arch 2, and in this embodiment, the radius of first hollow portion 4 is 2cm, and the radius of the hollow portion 5 of second is 1cm.
More specifically, the axis of first hollow portion 4 is located the top of taking body 1, and the axis of second hollow portion 5 is located the top surface place plane of taking body 1 for take the thickness of body 1 to keep in certain extent, in order to guarantee the structural strength of stagnant gas area, avoid setting up the intensity that takes body 1 thickness undersize influence stagnant gas area of first hollow portion 4 department, improve the stability and the reliability of stagnant gas area.
In practical application, the protruding 3 quantity of second can be a plurality ofly, when setting up a plurality of second arch 3, protruding 3 equidistant and parallel arrangement of second, improve the atress homogeneity in ending the gas zone, the protruding 3 shutoff expansion joints of second that can select to be located the middle part, or the protruding 3 of second that select suitable position according to the deformation law at expansion joint carries out the shutoff, in this embodiment, three protruding 3 of second have been set up, the protruding 3 shutoff expansion joints of second in the middle of, in practical application, can also adjust the protruding 3 quantity of second and the specification in ending the gas zone according to the specification at expansion joint, in order to guarantee sealed effect.
Further, the minimum distance between the first protrusion 2 and the second protrusion 3 is greater than the distance between two adjacent second protrusions 3, in this embodiment, the distance between the first protrusion 2 and the adjacent second protrusion 3 is 8cm, and the distance between the adjacent second protrusions 3 is 6cm, which can be adjusted according to specific conditions in practical application, thereby improving the flexible adaptability of the air-stop band.
In addition, take body 1 to be the banding structure of rectangle for the cross section, take body 1 and first protruding 2 junction to do the fillet and handle, improve the installation convenience in gas stopping area.
According to the air stop belt suitable for the expansion joint of the sealing layer, the cambered surfaces of the first protrusion 2 and the second protrusion 3 are in close contact with the surface of the concrete sealing layer, so that high-pressure sealing of the air storage is realized, and the air stop belt is more closely attached to the concrete sealing layer and the sealing effect is better as the pressure in the air storage is higher; meanwhile, the first bulge 2 and the second bulge 3 are both hollow structures, so that certain deformation can be generated, and the air stop belt is suitable for the deformation of the expansion joint while the sealing effect is ensured; the gas-stopping belt is made of rubber materials, so that the gas-stopping belt can bear repeated compression and tensile deformation, the reliability of the gas-stopping belt is improved, and the sealing performance of the gas storage is further ensured.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (10)
1. The utility model provides a stop gas area suitable for sealing layer expansion joint which characterized in that, including take the body with set up in take on the body:
the number of the first bulges is two, and the two first bulges are respectively arranged on two sides of the belt body;
the number of the second bulges is at least one, and the second bulges are arranged between the two first bulges;
the first protrusion and the second protrusion are both strip-shaped structures and extend along the length direction of the belt body, one sides of the first protrusion and the second protrusion, which are far away from the belt body, are both arc surfaces, and the first protrusion and the second protrusion are both hollow structures; and the first protrusion and the second protrusion can extend into the groove of the sealing layer.
2. The air stop belt for an expansion joint of a sealing layer as claimed in claim 1, wherein: the height of the first protrusion is greater than the height of the second protrusion.
3. The air stop band for an expansion joint of a sealing layer as claimed in claim 2, wherein: the cross section of the first bulge and the cross section of the second bulge are both semicircular, and the radius of the cross section of the first bulge is larger than that of the cross section of the second bulge.
4. The air stop band for an expansion joint of a sealing layer as claimed in claim 3, wherein: the circle center of the cross section of the first protrusion and the circle center of the cross section of the second protrusion are both located on the plane where the top surface of the belt body is located.
5. The air stop belt for an expansion joint of a sealing layer as claimed in claim 1, wherein: the first protrusion is provided with a first hollow part, the second protrusion is provided with a second hollow part, and the first hollow part and the second hollow part are both cylindrical structures.
6. The air stop band for an expansion joint of a sealing layer as claimed in claim 5, wherein: the diameter of the first hollow portion is greater than the diameter of the second hollow portion.
7. The gas stop band suitable for the expansion joint of the sealing layer as claimed in claim 6, wherein: the axis of the first hollow part is located at the top of the belt body, and the axis of the second hollow part is located on the plane where the top surface of the belt body is located.
8. The gas stop band suitable for the expansion joint of the sealing layer as claimed in claim 1, wherein: the number of the second bulges is multiple, and the second bulges are arranged in parallel at equal intervals.
9. The air stop band for an expansion joint of a sealing layer as claimed in claim 8, wherein: the minimum distance between the first protrusion and the second protrusion is larger than the distance between two adjacent second protrusions.
10. The air stop band for an expansion joint of a sealing layer as claimed in any one of claims 1 to 9, wherein: the belt body is of a belt-shaped structure with a rectangular cross section, and the joint of the belt body and the first bulge is subjected to rounding treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211625973.5A CN115977263A (en) | 2022-12-15 | 2022-12-15 | Air stopping belt suitable for sealing layer expansion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211625973.5A CN115977263A (en) | 2022-12-15 | 2022-12-15 | Air stopping belt suitable for sealing layer expansion joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115977263A true CN115977263A (en) | 2023-04-18 |
Family
ID=85975194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211625973.5A Pending CN115977263A (en) | 2022-12-15 | 2022-12-15 | Air stopping belt suitable for sealing layer expansion joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115977263A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020088192A1 (en) * | 1999-07-19 | 2002-07-11 | Calixto Jorge Gabrielli Zacharias | Sealing element for expansion joints |
| CN207486045U (en) * | 2017-11-02 | 2018-06-12 | 深圳市广浦瑞科技有限公司 | A kind of sealing ring of the pre-sealed function of band |
| CN113774727A (en) * | 2021-08-16 | 2021-12-10 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | High-speed railway seal coat expansion joint sealing rod and stagnant water structure |
| CN217582168U (en) * | 2022-04-14 | 2022-10-14 | 苏交科集团股份有限公司 | Rear-mounted waterstop in tunnel expansion joint |
-
2022
- 2022-12-15 CN CN202211625973.5A patent/CN115977263A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020088192A1 (en) * | 1999-07-19 | 2002-07-11 | Calixto Jorge Gabrielli Zacharias | Sealing element for expansion joints |
| CN207486045U (en) * | 2017-11-02 | 2018-06-12 | 深圳市广浦瑞科技有限公司 | A kind of sealing ring of the pre-sealed function of band |
| CN113774727A (en) * | 2021-08-16 | 2021-12-10 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | High-speed railway seal coat expansion joint sealing rod and stagnant water structure |
| CN217582168U (en) * | 2022-04-14 | 2022-10-14 | 苏交科集团股份有限公司 | Rear-mounted waterstop in tunnel expansion joint |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019080219A1 (en) | Method for using coal mine underground tunnel for compressed air energy storage | |
| CN108952777A (en) | A kind of novel combined waterproof sealing gasket of shield tunnel | |
| CN110107357B (en) | Underground gas storage and concrete parting self-adaptive resilience pressurization sealing device thereof | |
| CN112302691A (en) | Subway shield tunnel damping segment ring suitable for differential settlement and high-intensity earthquake areas | |
| CN115854257A (en) | Gas storage sealing device and method | |
| CN115977263A (en) | Air stopping belt suitable for sealing layer expansion joint | |
| CN107370341A (en) | A kind of current transformer of double sealing structure | |
| CN110080822B (en) | Underground rock cave gas storage and concrete lining parting gas leakage prevention structure | |
| CN210421179U (en) | Assembly type comprehensive pipe rack waterproof joint connecting structure | |
| CN218522326U (en) | Deformation joint leakage repair structure | |
| CN208331763U (en) | Sealing rubber film for dry gas chamber | |
| CN213627606U (en) | Subway shield tunnel damping segment ring suitable for differential settlement and high-intensity earthquake areas | |
| CN105222485A (en) | A kind of refrigerator door strip of paper used for sealing | |
| CN208996744U (en) | A kind of novel combined waterproof sealing gasket of shield tunnel | |
| CN109881957B (en) | Sealing structure between metal plate and impermeable geomembrane | |
| CN208331764U (en) | Sealing structure of rubber membrane sealing type gas chamber | |
| CN108758391A (en) | A kind of detachable LED light bar with strong water resistance | |
| CN204876388U (en) | Various steel tile roofing photovoltaic supporting structure | |
| CN211474141U (en) | Seam waterproof sealing structure suitable for shield tunnel segment opening or dislocation | |
| CN113944193A (en) | Expansion joint redundancy sealing device | |
| JP2012255266A (en) | Water sealing member for joint | |
| CN109411191A (en) | A kind of transformer sealing device | |
| CN110593324A (en) | Waterstop for immersed tube tunnel and method for limiting drawing and shaking of immersed tube | |
| CN217783529U (en) | Asymmetric waterproof structure of shield tunnel seam | |
| CN218441258U (en) | Lining plate for maintaining sewer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |