CN220469935U - Tunnel construction section of jurisdiction bight protection architecture - Google Patents
Tunnel construction section of jurisdiction bight protection architecture Download PDFInfo
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- CN220469935U CN220469935U CN202322328662.9U CN202322328662U CN220469935U CN 220469935 U CN220469935 U CN 220469935U CN 202322328662 U CN202322328662 U CN 202322328662U CN 220469935 U CN220469935 U CN 220469935U
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- 230000001154 acute effect Effects 0.000 claims description 10
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 11
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- 241000826860 Trapezium Species 0.000 description 2
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- 239000011435 rock Substances 0.000 description 1
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Abstract
The utility model belongs to a tunnel construction segment corner protection structure in the technical field of tunnel construction, and further relates to a manufacturing method of the tunnel construction segment corner protection structure. The outside of section of jurisdiction bight (3) sets up bight protection steel sheet (4), and concrete part (2) inside sets up firm connecting reinforcement (5), and bight protection steel sheet (4) one end is connected to one firm connecting reinforcement (5) one end, and the bight protection steel sheet (4) other end is connected to another bight protection steel sheet (4) one end, and every firm connecting reinforcement (5) one end is through one bight protection steel sheet (4) one end of U type connecting portion (7) fixed connection. The tunnel construction segment corner protection structure improves the rigidity of segment corners, protects segment corners, ensures that segments are not easy to damage due to extrusion or impact in the transportation and assembly processes, ensures the quality of segment structures and the integrity of corner surfaces, reduces the defect cost of follow-up segment repair, and improves the construction efficiency.
Description
Technical Field
The utility model belongs to the technical field of tunnel construction, and particularly relates to a tunnel construction segment corner protection structure.
Background
The development of urbanization is increasingly focused on the planning and construction of underground space, and shield construction is widely used for urban rail transit construction due to the superiority of the shield construction. The mechanical method communication channel is suitable for various geological environments such as soft soil, fine sand, high water-rich sand pebble, weathered rock stratum, composite stratum and the like, and can be constructed by adopting a small shield method. When the small shield method is used, the corner of the large-angle duct piece is fragile, and the duct piece is easy to collide and squeeze to damage in the conveying and assembling processes. In the pipe piece transportation process, the pipe piece is easy to damage due to collision or extrusion because the angle of the corner of the pipe piece is smaller, and the pipe piece is required to be propped up tightly by a pushing oil cylinder in the assembly process of the pipe piece and other construction workpieces on a construction site, so that the pipe piece is in place. In the pushing process of the oil cylinder, the force applied by the oil cylinder can cause damage to the pipe piece, especially damage to the corner part of the pipe piece, and influence the quality of the pipe piece and the integrity of the surface of the corner part.
In the prior art, the technology is named as a shield tunnel construction duct piece connecting structure and the technology with the publication number of 215804582U, the technology discloses a shield tunnel construction duct piece connecting structure, the shield tunnel construction duct piece connecting structure comprises at least one group of shield duct pieces, two adjacent groups of shield duct pieces are connected through a double-end locking assembly, the double-end locking assembly comprises a fixed block, a first positioning block and a second positioning block, the fixed block is arranged on one group of shield duct pieces through a second connecting rod, a second nut is further rotatably arranged on the second connecting rod, a positioning groove for installing a first positioning block and the second positioning block is further formed on the other group of shield duct pieces, a first connecting rod is further arranged on the second positioning block, and the first nut is rotatably arranged on the first connecting rod; the double-end locking assembly is novel in structure, convenient to install, and high in practicality, and engineering quality is effectively improved through the arrangement of the double-end locking assembly.
However, this technology does not relate to the technical problems and technical solutions of the present application.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: to the not enough of prior art, provide a simple structure, through institutional advancement, improve the rigidity of section of jurisdiction bight, realize the protection of section of jurisdiction bight, ensure that the section of jurisdiction receives extrusion or striking and be difficult for impaired in transportation and assembly in-process, guarantee the quality of section of jurisdiction structure and the integrality on bight surface, reduce the damaged risk of section of jurisdiction, reduce the cost of follow-up repair section of jurisdiction defect, improve the tunnel construction section of jurisdiction bight protection architecture of efficiency of construction.
The technical scheme adopted by the utility model is as follows:
the utility model relates to a tunnel construction duct piece corner protection structure, wherein a concrete part of a tunnel construction duct piece comprises a plurality of duct piece corners, a steel reinforcement framework of the tunnel construction duct piece comprises a plurality of stable connecting steel bars, corner protection steel plates are arranged on the outer sides of the duct piece corners, the corner protection steel plates are of a V-shaped structure, the stable connecting steel bars are arranged in the concrete part, one end of each stable connecting steel bar is connected with one end of each corner protection steel plate, one end of each other corner protection steel plate is connected with the other end of each corner protection steel plate, one end of each stable connecting steel bar is fixedly connected with one end of each corner protection steel plate through a U-shaped connecting part, and the other end of each stable connecting steel bar extends into the concrete part and is connected with the other end of the other stable connecting steel bar.
The tunnel construction section of jurisdiction set up to be trapezium structure, tunnel construction section of jurisdiction includes two obtuse angle limits and two acute angle limits, every is set up the corner protection steel sheet respectively in the corner limit position, the setting of corner protection steel sheet laminating concrete portion.
The corner protection steel plate comprises a corner protection steel plate assembly I and a corner protection steel plate assembly II, and the corner protection steel plate assembly I and the corner protection steel plate assembly II are welded and connected.
When the corner protection steel plate is arranged at the acute angle edge part of a tunnel construction duct piece, the corner protection steel plate component I is attached to one side face of the concrete part, and the corner protection steel plate component II is attached to the other side face of the concrete part.
One end of the stable connecting steel bar is connected with one end of a corner protection steel plate component I of the corner protection steel plate, and one end of the other corner protection steel plate is connected with the other end of a corner protection steel plate component II of the corner protection steel plate.
One end of one stable connecting steel bar is fixedly connected with one end of a corner protecting steel plate assembly I of the corner protecting steel plate through a U-shaped connecting part, and the other end of the other stable connecting steel bar is fixedly connected with the other end of the corner protecting steel plate assembly II of the corner protecting steel plate through a U-shaped connecting part 7, and the other ends of the two stable connecting steel bars connected with one corner protecting steel plate are connected.
The utility model also relates to a manufacturing method of the tunnel construction segment corner, which has the advantages of simple steps, improved rigidity of the segment corner, realization of segment corner protection, ensuring that the segment is not easy to damage due to extrusion or impact in the transportation and assembly processes, ensuring the quality of the segment structure and the integrity of the surface of the corner, reducing the risk of segment breakage, reducing the cost of repairing segment defects subsequently and improving the construction efficiency.
The manufacturing method of the tunnel construction duct piece corner comprises the following steps:
s1, processing and installing a steel reinforcement framework of a tunnel construction duct piece;
s2, manufacturing a corner protection steel plate of the tunnel construction duct piece; the corner protection steel plates are cut by adopting high-strength steel materials, and the two steel plates are welded according to the angle of the corner of the pipe piece in tunnel construction to form V-shaped corner protection steel plates; two ends of each corner protection steel plate are respectively connected with corresponding stable connecting steel bars, and each stable connecting steel bar is connected with each corner protection steel plate through a U-shaped connecting part;
s3, arranging a duct piece steel die, and casting and tamping duct piece concrete: sequentially distributing concrete in two layers, spreading and vibrating the concrete at two ends in place, covering a pressing plate, pressing the pressing plate firmly, and feeding and vibrating, wherein a vibrating rod cannot touch a steel mould core, a core rod, a steel mould and an embedded part during vibrating, so that the steel mould is shifted and damaged by a steel reinforcement framework; after the pipe piece concrete is poured and rammed, the other end of each stable connecting steel bar extends to the inside of the concrete part, so that the tunnel construction pipe piece is formed.
After the manufacturing of the corner protection steel plate is finished, the surface is derusted and polished, and a layer of anti-corrosion primer and two layers of anti-corrosion paint-free paint are coated in layers to ensure the anti-corrosion effect.
And after pouring, stopping for 3-4 hours, starting steaming, and putting the tunnel construction pipe piece into an airtight device for preventing evaporation of water and heat.
Piling up tunnel construction segments in a water pool, and taking out of the water pool for storage after water culture.
By adopting the technical scheme of the utility model, the working principle and the beneficial effects are as follows:
according to the tunnel construction duct piece corner protection structure and the manufacturing method thereof, when the tunnel construction duct piece is manufactured, the corner protection steel plates are arranged outside the duct piece corners to be protected, the corner protection steel plates are connected with the stable connecting steel bars of the steel bar frameworks, and then concrete is poured to form the concrete part, so that the stable connecting steel bars serve as the frameworks of the whole duct piece on one hand and are used for guaranteeing the strength of the duct piece, and serve as connecting parts of the corner protection steel plates on the other hand, the arrangement positions of the corner protection steel plates are guaranteed reliably, and after the concrete part is formed, the corner protection steel plates are reliably attached to the surface of the concrete part, and the strength of the duct piece corners is effectively improved. Therefore, the rigidity of the corner of the duct piece is effectively improved, the duct piece is not easy to damage even if extruded or collided in the transportation process or the assembly process, and the quality is guaranteed.
Drawings
The following is a brief description of what is expressed in the drawings of this specification and the references in the drawings:
fig. 1 is a schematic structural view of a tunnel construction segment according to the present utility model;
fig. 2 is a schematic top view of a tunnel construction segment according to the present utility model;
fig. 3 is a schematic view of a local structure of a connection part between a corner protecting steel plate and a stable connecting steel bar of the corner protecting structure of a tunnel construction duct piece according to the present utility model;
fig. 4 is a schematic top view of a corner protection steel plate of the tunnel construction segment corner protection structure according to the present utility model;
the reference numerals in the figures are respectively: 1. tunnel construction duct pieces; 2. a concrete section; 3. segment corners; 4. corner protection steel plates; 5. firmly connecting the steel bars; 6. a reinforcement cage; 7. a U-shaped connecting part; 8. corner protection steel plate component I; 9. corner protection steel plate assembly ii.
Detailed Description
The following describes the shape, structure, mutual position and connection relation between parts, action of parts and working principle of the specific embodiment of the present utility model by describing examples in further detail:
as shown in fig. 1-4, the utility model relates to a corner protection structure of a tunnel construction duct piece, wherein a concrete part 2 of the tunnel construction duct piece 1 comprises a plurality of duct piece corners 3, a steel reinforcement framework 6 of the tunnel construction duct piece 1 comprises a plurality of stable connecting steel bars 5, corner protection steel plates 4 are arranged on the outer sides of the duct piece corners 3, the corner protection steel plates 4 are in V-shaped structures, stable connecting steel bars 5 are arranged in the concrete part 2, one end of each stable connecting steel bar 5 is connected with one end of each corner protection steel plate 4, one end of the other corner protection steel plate 4 is connected with the other end of each corner protection steel plate 4, one end of each stable connecting steel bar 5 is fixedly connected with one end of each corner protection steel plate 4 through a U-shaped connecting part 7, and the other end of each stable connecting steel bar 5 extends into the concrete part 2 and is connected with the other end of the other stable connecting steel bar 5. The structure provides an improved technical scheme aiming at the defects in the prior art. The tunnel construction duct piece is formed by on-site processing, and a corner protection structure is added to the tunnel construction duct piece in order to improve the quality of the tunnel construction duct piece. When the corner of the tunnel construction pipe piece is manufactured, the steel reinforcement cage 6 of the tunnel construction pipe piece 1 is processed and installed; manufacturing a corner protection steel plate 4 of the tunnel construction duct piece 1; the corner protection steel plates 4 are cut by adopting high-strength steel materials, and the two steel plates are welded according to the angle of the duct piece corner 3 of the tunnel construction duct piece 1 to form V-shaped corner protection steel plates 4; two ends of each corner protection steel plate 4 are respectively connected with corresponding stable connecting steel bars 5, and each stable connecting steel bar 5 is connected with each corner protection steel plate 4 through a U-shaped connecting part 7; arranging a duct piece steel die, and casting and tamping duct piece concrete: the concrete is poured and smashed into two layers to be paved sequentially, the pressing plates are covered after the concrete at the two ends is paved and smashed in place, after the pressing plates are tightly pressed, feeding and vibrating are carried out, when the concrete is vibrated, a vibrating rod cannot touch a steel mould core, a core rod, reinforcing steel bars, a steel mould and an embedded part, the steel mould is shifted and damaged by a reinforcing steel bar framework 6, and the structure is used for reliably realizing pouring and forming of the concrete; after the pipe piece concrete is poured and rammed, the other end of each stable connecting steel bar 5 extends into the concrete part 2, so that the tunnel construction pipe piece is formed. Like this, when tunnel construction section of jurisdiction preparation, outside at section of jurisdiction bight 3 that needs to protect sets up bight protection steel sheet 4 to bight protection steel sheet 4 connects the firm joint bar 5 of framework of reinforcement 6, then pours the concrete, forms concrete portion 2, like this, firm joint bar 5 on the one hand is as the skeleton of whole section of jurisdiction for guarantee the intensity of section of jurisdiction, and firm joint bar 5 on the other hand is as the adapting unit of bight protection steel sheet 4, ensures that bight protection steel sheet 4's arrangement position is reliably ensured, after forming concrete portion, bight protection steel sheet 4 reliably laminates on concrete portion surface, effectively protects section of jurisdiction bight 3. Like this, tunnel construction section of jurisdiction is in the transportation or assemble the in-process, even receive extrusion or collision, also not fragile, effectively improves the rigidity of section of jurisdiction bight. The tunnel construction duct piece corner protection structure disclosed by the utility model has the advantages that the structure is simple, the rigidity of the duct piece corner is improved through structural improvement, the protection of the duct piece corner is realized, the duct piece is not easy to damage due to extrusion or impact in the transportation and assembly processes, the quality of the duct piece structure and the integrity of the corner surface are ensured, the duct piece damage risk is reduced, the follow-up duct piece repair defect cost is reduced, and the construction efficiency is improved.
The tunnel construction section of jurisdiction 1 set up to be trapezium structure, tunnel construction section of jurisdiction 1 includes two obtuse angle limit and two acute angle limit, every is set up bight protection steel sheet 4 respectively in the position of the rake angle limit, bight protection steel sheet 4 laminating concrete portion 2 sets up. Above-mentioned structure, tunnel construction section of jurisdiction 1 includes two obtuse angle limit and two acute angle limit, and what need protect is sharp angle limit, sets up the bight protection steel sheet 4 of parcel structure respectively in every acute angle portion outside, improves the rigidity of this section of jurisdiction bight 3. The shape of the tunnel construction segment 1 is not limited to a trapezoid structure, and may be other structures, and the obtuse angle side and the acute angle side of the tunnel construction segment 1 are not limited to two, and may be plural. The technology of the utility model can be adopted no matter what tunnel construction segment structure and the number of acute angle parts. Therefore, the structure and the method have wide application range and meet the tunnel construction requirements.
The corner protection steel plate 4 comprises a corner protection steel plate assembly I8 and a corner protection steel plate assembly II 9, and the corner protection steel plate assembly I8 and the corner protection steel plate assembly II 9 are welded and connected. Above-mentioned structure, the contained angle of the bight protection steel sheet subassembly I8 of bight protection steel sheet 4 and bight protection steel sheet subassembly II 9 is the same with the angle of section of jurisdiction bight 3 that needs to protect, ensures like this that bight protection steel sheet 4 arranges the back in place, and bight protection steel sheet subassembly I8 reliably laminates concrete part one side, and bight protection steel sheet subassembly II 9 reliably laminates concrete part opposite side. The corner protecting steel plate 4 is not easily detached even if it is pressed or bumped. The corner protection steel plate 4 is also reliably connected with the stable connecting steel bar 5 positioned in the concrete part.
When the corner protection steel plate 4 is arranged at the acute angle edge part of the tunnel construction duct piece 1, the corner protection steel plate component I8 is attached to one side face of the concrete part 2, and the corner protection steel plate component II 9 is attached to the other side face of the concrete part 2. One end of one stable connecting steel bar 5 is connected with one end of a corner protection steel plate component I8 of the corner protection steel plate 4, and one end of the other corner protection steel plate 4 is connected with the other end of a corner protection steel plate component II 9 of the corner protection steel plate 4. The above structure is a limitation of the arrangement position of the corner protection steel plate 4, and a limitation of the connection between the corner protection steel plate 4 and the stable connection steel bar 5, wherein the stable connection steel bar 5 is used as a skeleton of the whole duct piece for guaranteeing the strength of the duct piece after forming, and the stable connection steel bar 5 is connected with the corner protection steel plate 4, on one hand, the corner protection steel plate 4 is not easy to fall off, and on the other hand, the corner protection steel plate 4 also acts as a part of the fixed duct piece structure after forming.
One end of one stable connecting steel bar 5 is fixedly connected with one end of a corner protecting steel plate component I8 of the corner protecting steel plate 4 through a U-shaped connecting part 7, the other end of the other stable connecting steel bar 5 is fixedly connected with the other end of the corner protecting steel plate component II 9 of the corner protecting steel plate 4 through the U-shaped connecting part 7, and the other ends of the two stable connecting steel bars 5 connected with one corner protecting steel plate 4 are connected. Above-mentioned structure, every bight protection steel sheet 4 connects two firm connecting reinforcement 5 respectively, and two adjacent firm connecting reinforcement 5 are also connected, realize the reliable fixed of bight protection steel sheet 4, and firm connecting reinforcement 5 is as the important part of the skeleton of tunnel construction section of jurisdiction, improves section of jurisdiction intensity.
The utility model also relates to a manufacturing method of the tunnel construction segment corner, which has the advantages of simple steps, improved rigidity of the segment corner, realization of segment corner protection, ensuring that the segment is not easy to damage due to extrusion or impact in the transportation and assembly processes, ensuring the quality of the segment structure and the integrity of the surface of the corner, reducing the risk of segment breakage, reducing the cost of repairing segment defects subsequently and improving the construction efficiency.
The manufacturing method of the tunnel construction duct piece corner comprises the following steps:
s1, machining and installing a steel reinforcement cage 6 of a tunnel construction duct piece 1; s2, manufacturing a corner protection steel plate 4 of the tunnel construction duct piece 1; the corner protection steel plates 4 are cut by adopting high-strength steel materials, and the two steel plates are welded according to the angle of the duct piece corner 3 of the tunnel construction duct piece 1 to form V-shaped corner protection steel plates 4; two ends of each corner protection steel plate 4 are respectively connected with corresponding stable connecting steel bars 5, and each stable connecting steel bar 5 is connected with each corner protection steel plate 4 through a U-shaped connecting part 7; s3, arranging a duct piece steel die, and casting and tamping duct piece concrete: sequentially distributing concrete in two layers, spreading and vibrating the concrete at two ends in place, covering an upper pressing plate, pressing the pressing plate firmly, and feeding and vibrating, wherein a vibrating rod cannot touch a steel mould core, a core rod, a reinforcing steel bar, a steel mould and an embedded part during vibrating, so that the steel mould is shifted and damaged by the reinforcing steel framework 6; after the pipe piece concrete is poured and rammed, the other end of each stable connecting steel bar 5 extends into the concrete part 2, so that the tunnel construction pipe piece is formed.
After the corner protection steel plate 4 is manufactured, the surface is subjected to rust removal and polishing, and one layer of anti-corrosion primer and two layers of anti-corrosion paint-free are coated in layers to ensure the anti-corrosion effect. The above steps further process the corner protection steel plate 4, improve the quality of the corner protection steel plate 4 and prolong the service life.
And after pouring and tamping, stopping for 3-4 hours, starting steaming, and putting the tunnel construction pipe piece 1 into an airtight device for preventing moisture and heat from volatilizing for steaming. Above-mentioned structure, further handle the tunnel construction section of jurisdiction after processing for tunnel construction section of jurisdiction reaches required maintenance intensity.
Piling up the tunnel construction pipe pieces 1 in a water pool, and taking out of the water pool for storage after water culture.
According to the tunnel construction duct piece corner protection structure and the manufacturing method thereof, when the tunnel construction duct piece is manufactured, the corner protection steel plates 4 are arranged outside the duct piece corner 3, the corner protection steel plates 4 are connected with the stable connecting steel bars 5 of the steel bar framework 6, and then concrete is poured to form the concrete part 2, so that the stable connecting steel bars 5 serve as the framework of the whole duct piece on one hand and are used for guaranteeing the strength of the duct piece, and the stable connecting steel bars 5 serve as connecting parts of the corner protection steel plates 4 on the other hand, the arrangement positions of the corner protection steel plates 4 are guaranteed reliably, and after the concrete part is formed, the corner protection steel plates 4 are reliably attached to the surface of the concrete part, and the duct piece corner 3 is effectively protected. Like this, tunnel construction section of jurisdiction is in the transportation or assemble the in-process, even receive extrusion or collision, also not fragile, effectively improves the rigidity of section of jurisdiction bight.
While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the specific implementation of the utility model is not limited by the foregoing, but rather is within the scope of the utility model as long as various modifications are made by the method concept and technical scheme of the utility model, or the concept and technical scheme of the utility model are directly applied to other occasions without modification.
Claims (7)
1. The utility model provides a tunnel construction section of jurisdiction bight protection architecture which characterized in that: the concrete part (2) of tunnel construction section of jurisdiction (1) include a plurality of section of jurisdiction bights (3), the steel reinforcement skeleton (6) of tunnel construction section of jurisdiction (1) include a plurality of firm connecting steel bars (5), the section of jurisdiction bight (3) outside sets up bight protection steel sheet (4), bight protection steel sheet (4) are V font structure, inside setting up firm connecting steel bar (5) of concrete part (2), bight protection steel sheet (4) one end is connected to one firm connecting steel bar (5) one end, the bight protection steel sheet (4) other end is connected to another bight protection steel sheet (4) one end, every firm connecting steel bar (5) one end is through one bight protection steel sheet (4) one end of U type connecting portion (7) fixed connection, every firm connecting steel bar (5) other end extends to inside and the another firm connecting steel bar (5) other end of concrete part (2) to be connected.
2. The tunnel construction segment corner protection structure according to claim 1, wherein: the tunnel construction duct piece (1) is arranged to be of a trapezoid structure.
3. The tunnel construction segment corner protection structure according to claim 2, wherein: the tunnel construction duct piece (1) comprises two obtuse angle edges and two acute angle edges, each corner edge is provided with a corner protection steel plate (4) respectively, and the corner protection steel plates (4) are attached to the concrete part (2).
4. The tunnel construction segment corner protecting structure according to claim 1 or 2, characterized in that: the corner protection steel plate (4) comprises a corner protection steel plate assembly I (8) and a corner protection steel plate assembly II (9), and the corner protection steel plate assembly I (8) and the corner protection steel plate assembly II (9) are welded and connected.
5. The tunnel construction segment corner protection structure according to claim 4, wherein: when the corner protection steel plate (4) is arranged at the acute angle edge part of one tunnel construction duct piece (1), the corner protection steel plate component I (8) is attached to one side face of the concrete part (2), and the corner protection steel plate component II (9) is attached to the other side face of the concrete part (2).
6. The tunnel construction segment corner protection structure according to claim 5, wherein: one end of a stable connecting steel bar (5) is connected with one end of a corner protection steel plate component I (8) of the corner protection steel plate (4), and one end of the other corner protection steel plate (4) is connected with the other end of a corner protection steel plate component II (9) of the corner protection steel plate (4).
7. The tunnel construction segment corner protection structure according to claim 6, wherein: one end of one stable connecting steel bar (5) is fixedly connected with one end of a corner protecting steel plate component I (8) of the corner protecting steel plate (4) through a U-shaped connecting part (7), one end of the other stable connecting steel bar (5) is fixedly connected with the other end of a corner protecting steel plate component II (9) of the corner protecting steel plate (4) through the U-shaped connecting part (7), and two stable connecting steel bars (5) of the corner protecting steel plate (4) are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322328662.9U CN220469935U (en) | 2023-08-29 | 2023-08-29 | Tunnel construction section of jurisdiction bight protection architecture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322328662.9U CN220469935U (en) | 2023-08-29 | 2023-08-29 | Tunnel construction section of jurisdiction bight protection architecture |
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| Publication Number | Publication Date |
|---|---|
| CN220469935U true CN220469935U (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322328662.9U Active CN220469935U (en) | 2023-08-29 | 2023-08-29 | Tunnel construction section of jurisdiction bight protection architecture |
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| Country | Link |
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| CN (1) | CN220469935U (en) |
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2023
- 2023-08-29 CN CN202322328662.9U patent/CN220469935U/en active Active
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