CN217976235U - A reinforced structure for railway tunnel - Google Patents
A reinforced structure for railway tunnel Download PDFInfo
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- CN217976235U CN217976235U CN202221417316.7U CN202221417316U CN217976235U CN 217976235 U CN217976235 U CN 217976235U CN 202221417316 U CN202221417316 U CN 202221417316U CN 217976235 U CN217976235 U CN 217976235U
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Abstract
The utility model provides a reinforced structure for railway tunnel, which comprises a corrugated steel plate arch, anchor bolts, a concrete foundation, a self-advancing anchor rod and a self-adaptive concrete layer; the corrugated steel plate arch is arranged on the inner side of the existing tunnel secondary lining, the corrugated steel plate arch is formed by splicing corrugated steel single bodies, and adjacent corrugated steel single bodies are connected through fastening bolts; the foundation bolts are integrally arranged in the concrete foundation and connected to the bottom end of the corrugated steel plate arch; the self-adaptive concrete layer is formed by concreting self-adaptive concrete poured between the corrugated steel plate arch and the existing tunnel secondary lining. In the structure of the utility model, the corrugated steel plate arch and the adaptive cement are matched to complete the reinforcement of the filling of the existing tunnel secondary lining, thereby not only ensuring the reinforcement strength of the existing railway tunnel, but also ensuring the safety and reliability of the actual engineering; the corrugated steel plate arch is formed by splicing corrugated steel single bodies, the difficulty of reinforcing engineering is reduced, and the reinforcing construction efficiency of the existing tunnel is improved.
Description
Technical Field
The utility model belongs to the technical field of railway tunnel engineering, in particular to a reinforced structure for railway tunnel.
Background
In recent years, with the wide attention on railway construction, the railway construction has been developed greatly, railway operation mileage is increased year by year, and particularly, in southwest mountainous areas, the tunnel specific gravity is large. Because the operation time of partial tunnels is long, the old construction control of the construction process is poor at that time, and a series of diseases are inevitably generated in the operation process of the railway tunnel which is as long as 10-30 years, thereby bringing great potential safety hazards to railway operation. The causes of the railway tunnel lining damage can also be attributed to external force factors (bias pressure, loose ground pressure, landslide, expansion pressure and the like), construction factors (overbreak, insufficient lining thickness and the like) and material degradation factors, which are consistent with the causes of the highway tunnel lining damage and are different from the highway tunnel, and the damage of the lining structure can be caused by train vibration load. In addition, for a high-speed railway, pressure waves and dynamic loads generated by a train in high-speed running are also one of factors which are not negligible for generating diseases on a tunnel lining.
The railway tunnel reinforcement is similar to the method for reinforcing the highway tunnel, such as grouting, arch sheathing, corrugated steel, steel plate pasting, fiber cloth and the like, but due to different functions (such as the need of reinforcing the lining of the high-speed railway tunnel, the important consideration of building limits, skylight reinforcement period, aerodynamic load influence and the like) and different causes of diseases, specific reinforcement measures can be taken according to specific situations in the actual reinforcement.
The existing railway tunnel reinforcing structure is mainly characterized in that a lining is additionally arranged inside a tunnel, the structure can reinforce the existing lining damage, but the construction efficiency is low, and the reliability of the reinforcing structure is low.
How to design a reinforced structure for railway tunnel, how to increase the reinforced efficiency of railway tunnel, guarantee reinforced structure's reliability to reduce the maintenance cost, become the problem that the solution is badly needed.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcoming of prior art, the utility model aims to provide a reinforced structure for railway tunnel for solve among the prior art railway tunnel and consolidate the problem that efficiency of construction is low, reinforced structure reliability is low.
In order to achieve the purpose, the utility model provides a reinforced structure for railway tunnel, which comprises a corrugated steel plate arch, foundation bolts, a concrete foundation, a self-advancing anchor rod and a self-adaptive concrete layer;
the corrugated steel plate arch is arranged on the inner side of the existing tunnel secondary lining, the corrugated steel plate arch is formed by splicing corrugated steel single bodies, and adjacent corrugated steel single bodies are connected through fastening bolts;
the foundation bolts are integrally arranged inside the concrete foundation and connected to the bottom end of the corrugated steel plate arch;
the concrete foundation is fixedly connected to the inner side of the existing tunnel secondary lining arch springing;
the self-advancing anchor rod penetrates through the bottom end of the corrugated steel plate arch and is driven into the inner wall of the existing tunnel;
the self-adaptive concrete layer is formed by consolidating self-adaptive concrete poured between a corrugated steel plate arch and the existing tunnel secondary lining;
by adopting the technical scheme: the corrugated steel plate arch is assembled by corrugated steel monomers, a pouring space is formed between the corrugated steel plate arch and the existing tunnel secondary lining, then self-adaptive concrete is poured into the pouring space formed between the corrugated steel plate arch and the existing tunnel secondary lining, the self-adaptive concrete can automatically fill cracks and leaks on the existing tunnel secondary lining, and a self-adaptive concrete layer is formed after solidification, so that the corrugated steel plate arch and the existing tunnel secondary lining are fixed, and the existing tunnel is reinforced; the assembled corrugated steel plate arch is matched with the existing tunnel secondary lining to form a pouring space, then the self-adaptive concrete is poured into the pouring space, and a self-adaptive concrete layer is formed by consolidation of the self-adaptive concrete to reinforce the existing culvert, so that the reinforcing difficulty of the tunnel is reduced, and the safety and reliability of the actual engineering can be ensured; corrugated steel itself has stronger support intensity to can assemble in advance, can realize that existing tunnel secondary lining fills and consolidate when cooperating self-adaptation cement, reduce the engineering time, increase the reinforcement efficiency in existing tunnel.
In an embodiment of the present invention, the two ends of the corrugated steel single body in the width direction are vertically connected with first flange plates, the adjacent corrugated steel single bodies in the axial direction of the tunnel are connected by the fastening bolts matched with the adjacent first flange plates, and the connecting holes formed on the adjacent first flange plates and matched with the fastening bolts are correspondingly located at the inner sides of the corrugated steel arch; a sealing gasket is clamped between the adjacent first flange plates;
by adopting the technical scheme: the first flange plate is connected to the end part of the corrugated steel single body in the width direction, so that the connecting position between the adjacent corrugated steel single bodies arranged in the axial direction of the tunnel is provided, the bending strength between the adjacent corrugated steel single bodies can be increased after the corrugated steel single bodies are connected by matching with a fastening bolt, the structural strength of the corrugated steel arch in the axial direction of the tunnel is further increased, and the stability of the corrugated steel arch in the axial direction of the tunnel is ensured; the connecting holes formed in the first flange plate corresponding to the fastening bolts are positioned on the inner side of the corrugated steel plate arch, so that the corrugated steel single bodies can be conveniently connected by constructors; the sealing gasket clamped between the adjacent first flange plates can increase the sealing performance between the first flange plates, and the problems of water leakage and slurry leakage at the connecting position are avoided.
In an embodiment of the present invention, the two ends of the corrugated steel single body in the length direction are vertically connected to second flange plates, the adjacent corrugated steel single bodies in the circumferential direction of the tunnel are connected by the adjacent second flange plates matching with fastening bolts, and the connecting holes provided on the adjacent second flange plates and matching with the fastening bolts are correspondingly located at the inner sides of the corrugated steel plate arches; a sealing gasket is clamped between the adjacent second flange plates;
by adopting the technical scheme: the end part of the corrugated steel single body in the length direction is connected with a second flange plate, the connecting position between the adjacent corrugated steel single bodies arranged in the tunnel circumferential direction is provided, and the bending strength between the adjacent corrugated steel single bodies can be increased after the corrugated steel single bodies are connected by matching with a fastening bolt, so that the structural strength of the corrugated steel plate arch in the tunnel circumferential direction is increased, and the stability of the corrugated steel plate arch in the tunnel circumferential direction is ensured; the connecting holes formed in the second flange plate corresponding to the fastening bolts are positioned on the inner side of the corrugated steel plate arch, so that the corrugated steel single bodies can be conveniently connected by constructors; the sealing gasket clamped between the adjacent second flange plates can increase the sealing performance between the second flange plates, and the problems of water leakage and slurry leakage at the connecting position are avoided.
In an embodiment of the present invention, a reinforcing plate is disposed between the second flange plate and the plate body outside the corrugated steel single body corresponding to the corrugated steel plate arch;
by adopting the technical scheme: the reinforcing plate can increase the joint strength between second flange board and the corrugated steel monomer on the one hand, and on the other hand can increase the connection stability between corrugated steel monomer and self-adaptation concrete layer and the existing tunnel secondary lining after the self-adaptation concrete is concreted to concreting in corrugated steel monomer dorsal part.
In an embodiment of the present invention, the top end of the anchor bolt extends out of the interior of the concrete foundation, and the bottom end of the anchor bolt is welded to a reinforcement cage inside the concrete foundation;
by adopting the technical scheme: the top ends of the foundation bolts extend out of the concrete foundation so as to ensure that the bottom ends of the corrugated steel plate arches can be correspondingly installed with the foundation bolts after the concrete foundation is formed; the bottom of rag bolt and the inside steel reinforcement cage welding of concrete foundation are in order to increase rag bolt and concrete foundation's joint strength, and then encircle at the ripple steel sheet and install on concrete foundation after, increase the stability of its installation.
In an embodiment of the present invention, the self-advancing anchor rods are correspondingly inserted into the lowest corrugated steel single body of the assembled corrugated steel plate arch, and the self-advancing anchor rods are uniformly arranged on any one of the lowest corrugated steel single bodies at intervals along the axial direction of the tunnel;
by adopting the technical scheme: increase the stability between corrugated steel plate arch and the existing tunnel through setting up the self-advancing stock to avoid corrugated steel plate arch to remove, increase the reinforcement effect to the tunnel.
Advantageous effects
In the structure of the utility model, the corrugated steel plate arch and the adaptive cement are matched to complete the reinforcement of the filling of the existing tunnel secondary lining, thereby not only ensuring the reinforcement strength of the existing railway tunnel, but also ensuring the safety and reliability of the actual engineering; the corrugated steel plate arch is formed by splicing corrugated steel single bodies, so that the difficulty of reinforcement engineering is reduced, the construction time can be shortened, and the reinforcement construction efficiency of the existing tunnel is improved; the corrugated steel single bodies are connected through the flange plates, so that the on-site rapid assembly can be realized, the bending strength of the whole corrugated steel plate arch can be increased, and the integral reinforcing effect can be improved; the popularization and the application have good economic benefit and social benefit.
Drawings
Fig. 1 is a sectional view of the reinforcing structure of the present invention.
Fig. 2 is a schematic view of the connection between the corrugated steel plate arch and the foundation bolt of the present invention.
Fig. 3 is a schematic diagram of the position of the concrete foundation of the present invention.
Fig. 4 is a front view of the corrugated steel single body of the present invention.
Fig. 5 is a cross-sectional view of a standard section reinforcement layer of the present invention.
In the figure: 1. a corrugated steel plate arch; 11. a corrugated steel single body; 12. a first flange plate; 13. a second flange plate; 14. a reinforcing plate; 2. anchor bolts; 3. a concrete foundation; 4. a self-advancing anchor rod; 5. a self-adaptive concrete layer; 6. and (5) secondary lining.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1 to 5. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description only, and are not used to limit the scope of the present invention, and the relative relationship between the terms may be changed or adjusted without substantial technical changes.
As shown in fig. 1 to 5, the present invention provides a reinforced structure for railway tunnel, which comprises a corrugated steel plate arch 1, anchor bolts 2, a concrete foundation 3, self-advancing anchor rods 4 and a self-adaptive concrete layer 5; by adopting the technical scheme: corrugated steel plate arch 1, rag bolt 2, concrete foundation 3, self-advancing anchor rod 4 and self-adaptation concrete layer 5 are the main component structure of railway tunnel reinforcement.
The corrugated steel plate arch 1 is arranged on the inner side of the existing tunnel secondary lining 6, the corrugated steel plate arch 1 is formed by splicing corrugated steel single bodies 11, and the adjacent corrugated steel single bodies 11 are connected through fastening bolts; by adopting the technical scheme: the corrugated steel plate arch 1 is formed by connecting corrugated steel single bodies 11 through fastening bolts, the assembling difficulty of the corrugated steel plate arch 2 is low, and a large amount of working hours can be saved.
Furthermore, two ends of each corrugated steel single body 11 in the width direction are vertically connected with a first flange plate 12, adjacent corrugated steel single bodies 11 in the axial direction of the tunnel are connected through the matching of the adjacent first flange plates 12 and fastening bolts, and connecting holes which are formed in the adjacent first flange plates 12 and matched with the fastening bolts are correspondingly positioned on the inner side of the corrugated steel plate arch 1; a sealing gasket is clamped between the adjacent first flange plates 12; by adopting the technical scheme: the first flange plate 12 is connected to the end part of the corrugated steel single body 11 in the width direction, so that the connecting position between the adjacent corrugated steel single bodies 11 arranged in the tunnel axial direction is provided, the bending strength between the adjacent corrugated steel single bodies 11 can be increased after the corrugated steel single bodies are connected by matching with fastening bolts, the structural strength of the corrugated steel plate arch 1 in the tunnel axial direction is further increased, and the stability of the corrugated steel plate arch 1 in the tunnel axial direction is ensured; the connecting holes formed in the first flange plate 12 corresponding to the fastening bolts are located on the inner side of the corrugated steel plate arch 1, so that the corrugated steel single bodies 11 can be conveniently connected by constructors; the sealing gasket clamped between the adjacent first flange plates 12 can increase the sealing performance between the first flange plates 12, and the problems of water leakage and slurry leakage at the connecting position are avoided.
Furthermore, two ends of each corrugated steel single body 11 in the length direction are vertically connected with a second flange plate 13, adjacent corrugated steel single bodies 11 in the circumferential direction of the tunnel are connected through the matching of the adjacent second flange plates 13 and fastening bolts, and connecting holes which are formed in the adjacent second flange plates 13 and matched with the fastening bolts are correspondingly positioned on the inner side of the corrugated steel plate arch 1; a sealing gasket is clamped between the adjacent second flange plates 13; by adopting the technical scheme: the end parts of the corrugated steel single bodies 11 in the length direction are connected with second flange plates 13, so that connecting positions between the adjacent corrugated steel single bodies 11 arranged in the circumferential direction of the tunnel are provided, the bending strength between the adjacent corrugated steel single bodies 11 can be increased after the corrugated steel single bodies are connected by matching with fastening bolts, the structural strength of the corrugated steel plate arch 1 in the circumferential direction of the tunnel is further increased, and the stability of the corrugated steel plate arch 1 in the circumferential direction of the tunnel is ensured; the connecting holes formed in the second flange plate 13 corresponding to the fastening bolts are located on the inner side of the corrugated steel plate arch 1, and are convenient for construction personnel to connect the corrugated steel single bodies 11; the sealing gasket clamped between the adjacent second flange plates 13 can increase the sealing performance between the second flange plates 13, and the problems of water leakage and slurry leakage at the connecting position are avoided.
Furthermore, a reinforcing plate 14 is arranged between the second flange plate 13 and the plate body of the corrugated steel single body 11 corresponding to the outer side of the corrugated steel plate arch 1. By adopting the technical scheme: the reinforcing plate 14 can increase the connection strength between the second flange plate 13 and the corrugated steel single body 11, and can increase the connection stability between the corrugated steel single body 11 and the adaptive concrete layer 5 and the existing tunnel secondary lining 6 after the adaptive concrete is poured and solidified on the back side of the corrugated steel single body 11.
The foundation bolts 2 are integrally arranged inside the concrete foundation 3 and connected to the bottom end of the corrugated steel plate arch 1; by adopting the technical scheme: the foundation bolts 2 are integrally arranged in the concrete foundation 3, and a premise is provided for connection of the corrugated steel plate arch 1 and the concrete foundation 3.
Furthermore, the top end of the foundation bolt 2 extends out of the interior of the concrete foundation 3, and the bottom end of the foundation bolt 2 is welded with a reinforcement cage inside the concrete foundation 3. By adopting the technical scheme: the top ends of the foundation bolts 2 extend out of the concrete foundation 3, so as to ensure that the bottom ends of the corrugated steel plate arches 1 can be correspondingly installed with the foundation bolts 2 after the concrete foundation 3 is formed; the bottom of foundation bolt 2 and the inside steel reinforcement cage welding of concrete foundation 3 are in order to increase foundation bolt 2 and concrete foundation 3's joint strength, and then after corrugated steel plate arch 1 installed on concrete foundation 3, increase the stability of its installation.
The concrete foundation 3 is fixedly connected with the inner side of the existing tunnel secondary lining 6 arch springing. By adopting the technical scheme: and a connecting foundation for the bottom ends of the two sides of the corrugated steel plate arch 1 is provided.
The self-advancing anchor rod 4 penetrates through the bottom end of the corrugated steel plate arch 1 and is driven into the inner wall of the existing tunnel.
Furthermore, the self-advancing anchor rods 4 correspondingly penetrate through the corrugated steel single bodies 11 at the lowest side of the assembled corrugated steel plate arch 1, and the self-advancing anchor rods 4 are uniformly distributed on any one of the corrugated steel single bodies 11 at the lowest side at intervals along the axial direction of the tunnel. By adopting the technical scheme: increase the corrugated steel plate through setting up from advancing formula stock 4 and encircle 1 and the existing tunnel between stability to avoid corrugated steel plate to encircle 1 removal, increase the reinforcement effect to the tunnel.
The self-adaptive concrete layer 5 is formed by concreting self-adaptive concrete poured between the corrugated steel plate arch 1 and the existing tunnel secondary lining 6. By adopting the technical scheme: the self-adaptive concrete can automatically fill cracks and leaks on the existing tunnel secondary lining 6, and a self-adaptive concrete layer 5 is formed after solidification, so that the corrugated steel plate arch 1 is fixed with the existing tunnel secondary lining 6, and the existing tunnel is reinforced.
In the concrete implementation, binding a reinforcement cage on the inner side of the existing tunnel secondary lining 6 arch springing, integrally welding foundation bolts 2 on the top of the reinforcement cage, erecting a template and pouring concrete, forming a concrete foundation 3 after the concrete is solidified, and dismantling the template; placing a corrugated steel monomer 11 on a concrete foundation 3, fixing the bottom end of the corrugated steel monomer 11 with a foundation bolt 2 on the concrete foundation 3, connecting a second corrugated steel monomer 11 on the installed corrugated steel monomer 11 in the clockwise direction, repeating the steps to complete installation of a circle of corrugated steel monomer 11, installing a second circle of corrugated steel monomer 11 in the mode, connecting the second circle of corrugated steel monomer 11 with a first circle of corrugated steel monomer 11 through a fastening bolt, repeating the steps to form a corrugated steel plate arch 1 by a plurality of circles of corrugated steel monomers 11; sealing a port formed between the installed corrugated steel plate arch 1 and the existing tunnel secondary lining 6, pouring adaptive concrete into a space formed between the corrugated steel plate arch 1 and the existing tunnel secondary lining 6, and solidifying the adaptive concrete to form an adaptive concrete layer 5; and (4) removing the plugging material, and cleaning sundries generated after construction to finish the construction.
To sum up, the utility model provides a reinforcing structure for railway tunnel, which adopts corrugated steel plate arch 1 and adaptive cement to cooperate to complete the reinforcement of the filling of the existing tunnel secondary lining 6, thus not only ensuring the reinforcing strength of the existing railway tunnel, but also ensuring the safety and reliability of the actual engineering; the corrugated steel plate arch 1 is formed by splicing the corrugated steel single bodies 11, so that the difficulty of reinforcement engineering is reduced, the construction time can be shortened, and the reinforcement construction efficiency of the existing tunnel is improved; the corrugated steel single bodies 11 are connected through the flange plates, so that the on-site rapid assembly can be realized, the bending strength of the whole corrugated steel plate arch 1 can be increased, and the integral reinforcing effect can be improved; the popularization and the application have good economic benefit and social benefit. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A reinforced structure for a railway tunnel comprises a corrugated steel plate arch (1), foundation bolts (2), a concrete foundation (3), a self-advancing anchor rod (4) and a self-adaptive concrete layer (5);
the method is characterized in that: the corrugated steel plate arch (1) is arranged on the inner side of the existing tunnel secondary lining (6), the corrugated steel plate arch (1) is formed by splicing corrugated steel single bodies (11), and the adjacent corrugated steel single bodies (11) are connected through fastening bolts;
the foundation bolts (2) are integrally arranged inside the concrete foundation (3) and connected to the bottom end of the corrugated steel plate arch (1);
the concrete foundation (3) is fixedly connected to the inner side of the arch springing of the existing tunnel secondary lining (6);
the self-advancing anchor rod (4) penetrates through the bottom end of the corrugated steel plate arch (1) and is driven into the inner wall of the existing tunnel;
the self-adaptive concrete layer (5) is formed by concreting self-adaptive concrete poured between the corrugated steel plate arch (1) and the existing tunnel secondary lining (6).
2. A reinforcing structure for railway tunnels according to claim 1, characterized in that: two ends of each corrugated steel monomer (11) in the width direction are vertically connected with a first flange plate (12), adjacent corrugated steel monomers (11) in the axial direction of the tunnel are connected through the matching of the adjacent first flange plates (12) and fastening bolts, and connecting holes which are formed in the adjacent first flange plates (12) and matched with the fastening bolts are correspondingly positioned on the inner side of the corrugated steel plate arch (1); and a sealing gasket is clamped between the adjacent first flange plates (12).
3. A reinforcing structure for railway tunnels according to claim 1, characterized in that: two ends of each corrugated steel monomer (11) in the length direction are vertically connected with a second flange plate (13), adjacent corrugated steel monomers (11) in the circumferential direction of the tunnel are connected through the matching of the adjacent second flange plates (13) and fastening bolts, and connecting holes which are formed in the adjacent second flange plates (13) and matched with the fastening bolts are correspondingly positioned on the inner side of the corrugated steel plate arch (1); and a sealing gasket is clamped between the adjacent second flange plates (13).
4. A reinforcing structure for railway tunnels according to claim 3, characterized in that: and a reinforcing plate (14) is arranged between the second flange plate (13) and the corrugated steel single body (11) corresponding to the plate body on the outer side of the corrugated steel plate arch (1).
5. A reinforcing structure for railway tunnels according to claim 1, characterized in that: the top end of the foundation bolt (2) stretches out of the interior of the concrete foundation (3), and the bottom end of the foundation bolt (2) is welded with a reinforcement cage inside the concrete foundation (3).
6. A reinforcing structure for railway tunnels according to claim 1, characterized in that: the self-advancing anchor rods (4) correspondingly penetrate through the corrugated steel single bodies (11) at the lowest side of the assembled corrugated steel plate arch (1), and the self-advancing anchor rods (4) are uniformly distributed on any one of the corrugated steel single bodies (11) at the lowest side at intervals along the axial direction of the tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221417316.7U CN217976235U (en) | 2022-06-08 | 2022-06-08 | A reinforced structure for railway tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221417316.7U CN217976235U (en) | 2022-06-08 | 2022-06-08 | A reinforced structure for railway tunnel |
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| Publication Number | Publication Date |
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| CN217976235U true CN217976235U (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221417316.7U Active CN217976235U (en) | 2022-06-08 | 2022-06-08 | A reinforced structure for railway tunnel |
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| CN (1) | CN217976235U (en) |
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- 2022-06-08 CN CN202221417316.7U patent/CN217976235U/en active Active
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