CN219218738U - Anti-overturning device for bracket and single-pier bridge - Google Patents
Anti-overturning device for bracket and single-pier bridge Download PDFInfo
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- CN219218738U CN219218738U CN202320485487.1U CN202320485487U CN219218738U CN 219218738 U CN219218738 U CN 219218738U CN 202320485487 U CN202320485487 U CN 202320485487U CN 219218738 U CN219218738 U CN 219218738U
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Abstract
The utility model relates to an anti-overturning device for a bracket and a single-pier bridge. The bracket comprises a supporting structure, a counter-pulling structure and two brackets, wherein the two brackets are transversely distributed at intervals and are arranged on the supporting structure, and the two brackets are connected through the counter-pulling structure. The anti-overturning device of the single-column pier bridge comprises a support, wherein two brackets of the support are arranged on two lateral sides of a transverse bridge of the single-column pier, and newly-increased supports are arranged on the top surfaces of the two brackets. The anti-overturning device for the single-column pier bridge is characterized in that two brackets are connected and supported on the two sides of the transverse bridge of the single-column pier, so that a newly-added support can be additionally arranged on the two brackets to form a three-support structure, and the anti-overturning device is stable in structure and can prevent the single-column pier from overturning. And the bracket adopts bearing structure to provide vertical support to the bracket and carries out horizontal spacing with two brackets through to drawing the structure, connects and support two brackets to the both sides at the cross bridge of single pier, and steel is few, and is with low costs, and the welding volume is little, and the construction is more convenient, and the shaping is faster.
Description
Technical Field
The utility model relates to the technical field of bridge structure reinforcement, in particular to an anti-overturning device for a bracket and a single-pier bridge.
Background
The single-pier bridge has the advantages of small occupied space under the bridge, attractive cross section form, cost saving and the like, and is widely applied to projects such as urban interchange, expressway intersections and the like. In recent years, along with the development of economy at a high speed, the accompanying traffic volume is increased continuously, so that the single-pier bridge is easy to generate diseases such as beam torsion and deformation, uneven stress of a support, void and the like in the operation process, and the bridge overturning safety accident also happens. At present, a scheme of changing a single support to three supports is often adopted for anti-overturning reinforcement of a single pier, and steel anchor clamps are added on the outer side of the pier to realize multi-point support. However, because steel anchor ear is mostly formed by welding steel plates, the steel consumption is large, the cost is high, the welding amount is large, the quality requirement is high, the actual construction quality level is uneven, the important point is that the construction period is long, the influence on traffic is large, and the social pressure of a management and maintenance unit is huge.
Disclosure of Invention
The utility model aims at: when the scheme of changing the single support to the three supports is adopted to strengthen the single pier anti-overturning, the steel anchor ear is added to the outer side of the pier to realize multi-point support, and the problems of large steel consumption, high cost, large welding quantity, high quality requirement and inconvenient construction exist.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a support, includes bearing structure, to drawing structure and two brackets, two the bracket transversely interval distribution, two the bracket set up in on the bearing structure, two the bracket passes through to drawing structure is to drawing and is connected.
Adopt this application the support provides vertical support through bearing structure to the bracket and carries out horizontal spacing through to drawing the structure with two brackets, connects two brackets and supports the transverse bridge at the single pier to both sides for can add the support and form three support structures on two brackets, can prevent that the single pier from overturning. And this kind of structure is less in steel that the steel staple bolt adopted, and the cost is lower, and two brackets pass through bearing structure vertical support and to drawing the structure and to drawing the connection formation fixedly, compare in the construction mode welding volume of steel staple bolt little, the construction is more convenient, the shaping is faster.
Preferably, the bracket has right triangle's cross section, one of them right angle limit of cross section of bracket sets up vertically and leans on interior setting, another right angle limit sets up in the top on vertical right angle limit, utilizes triangle's stability, and stability is higher, adopts right triangle's cross section, is convenient for install newly-increased support, and is convenient for install the side at the single pier.
Preferably, the bracket comprises a plurality of transverse I-beams, a plurality of vertical I-beams and a plurality of oblique I-beams which are longitudinally and alternately distributed, wherein the transverse I-beams, the vertical I-beams and the oblique I-beams are correspondingly arranged, the transverse I-beams, the vertical I-beams and the oblique I-beams are enclosed to form a right triangle, the middle parts of the adjacent vertical I-beams are connected through a transverse connection system, the bottoms of the adjacent vertical I-beams are connected through a bottom steel base plate, and the top surfaces of the adjacent transverse I-beams are connected through a top steel base plate.
The transverse I-steel, the vertical I-steel and the inclined I-steel are enclosed to form a right-angled triangle frame, and the longitudinal right-angled triangle frames are connected together through the transverse connection system, the bottom steel backing plate and the top steel backing plate, so that the supporting capacity of the bracket is better and more stable. And the top steel backing plate is convenient to be used for installing the newly-increased support, and the steel consumption can be further reduced under the condition of meeting the required supporting capacity of the newly-increased support.
Preferably, the transverse connection system is a supporting channel steel, two adjacent vertical I-steel are connected at two ends of the supporting channel steel, welding is convenient, and the stabilizing effect after welding is better.
Preferably, the opening of the supporting channel steel faces to the side, vertical stiffening ribs are arranged in the supporting channel steel, and the upper ends and the lower ends of the stiffening ribs are correspondingly connected with the upper flange and the lower flange of the supporting channel steel, so that stability can be improved.
Preferably, the supporting structure is a plurality of transverse anchors which are vertically spaced in rows and longitudinally spaced in columns, the transverse anchors are steel bars or anchor bolts, and the supporting channel steel and the bottom steel backing plates are vertically hung on the corresponding transverse anchors respectively, so that the installation is convenient.
Preferably, the two brackets are respectively arranged on two lateral sides of the single pier, the lateral anchors are embedded into two lateral sides of the single pier, and the brackets are supported by the lateral anchors embedded into the single pier, so that the stability is higher.
Preferably, the opposite-pulling structure comprises a plurality of finish rolling deformed steel bars which are transversely arranged and a plurality of anchoring pieces which are longitudinally arranged, wherein the finish rolling deformed steel bars and the anchoring pieces form a rectangular frame structure, the anchoring pieces comprise two anchor channel steel which are arranged up and down, the two anchor channel steel are connected through anchor steel plates, a gap for the finish rolling deformed steel bars to pass through is reserved between the two anchor channel steel plates, and the finish rolling deformed steel bars pass through the anchor steel plates and tighten the anchor steel plates through anchor nuts.
Above-mentioned to drawing structure, simple structure, it is little with steel volume, with low costs, simple to operate and to the taut effectual of two brackets, can not interfere with the bracket during the installation, it is more convenient to operate.
The anti-overturning device for the single-column pier bridge comprises a bracket, wherein two brackets of the bracket are arranged on two lateral sides of the single-column pier bridge, and newly-increased supports are arranged on the top surfaces of the two brackets.
The anti-overturning device for the single-column pier bridge is characterized in that two brackets are connected and supported on two sides of a transverse bridge of the single-column pier, so that a newly-added support can be additionally arranged on the two brackets to form a three-support structure, the structure is stable, and the single-column pier can be prevented from overturning. The structure has the advantages of less steel, low cost, small welding quantity, more convenient construction and faster molding.
Preferably, the galvanized steel sheet is wrapped outside the bracket, and the galvanized steel sheet is detachable.
The galvanized steel sheet is wrapped outside the support, so that the support can be protected, and the support is more attractive. The galvanized steel sheet can be dismantled, is convenient for detect the support condition.
In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:
1. according to the bracket, the two brackets are connected and supported on the two lateral sides of the single pier, so that the three-support structure can be formed by additionally arranging the supports on the two brackets, and the single pier can be prevented from overturning. Compared with the steel hoop, the steel hoop has fewer steel materials and lower cost. And two brackets pass through bearing structure vertical stay and to drawing the structure and to drawing the connection formation fixedly, compare in the construction mode welding volume of steel staple bolt little, construction is more convenient, and the shaping is faster. And the bracket can be assembled quickly by adopting I-steel and other components, and prefabricated in advance.
2. According to the anti-overturning device for the single-column pier bridge, the two brackets are connected and supported on the two lateral sides of the single-column pier, so that newly-added supports can be additionally arranged on the two brackets to form a three-support structure, the structure is stable, and the single-column pier can be prevented from overturning. The structure has the advantages of less steel, low cost, small welding quantity, more convenient construction and faster molding.
3. According to the anti-overturning device for the single-pier bridge, the galvanized steel sheet is wrapped outside the support, so that the support can be protected, and the anti-overturning device is more attractive. The galvanized steel sheet can be dismantled, is convenient for detect the support condition.
Drawings
FIG. 1 is a schematic view of a stent structure of the present utility model;
FIG. 2 is a schematic front view of the stent structure of the present utility model in use;
FIG. 3 is a schematic cross-sectional view at A-A of FIG. 2;
FIG. 4 is a schematic cross-sectional view at B-B in FIG. 2;
FIG. 5 is a schematic cross-sectional view taken at C-C of FIG. 2;
FIG. 6 is a side view of the stent structure of the present utility model in use;
FIG. 7 is an enlarged schematic view of a portion of FIG. 6 at circle A;
FIG. 8 is a schematic front view of an anti-toppling apparatus of the single pier bridge of the present utility model;
fig. 9 is a schematic side view of an anti-overturning device for the single pier bridge of the present utility model.
Icon: 1-corbels; 101-transverse I-steel; 102-vertical I-steel; 103-oblique I-steel; 2-supporting channel steel; 3-stiffening ribs; 4-finish rolling deformed steel bars; 5-top steel backing plate; 6-a bottom steel backing plate; 7-anchoring channel steel; 8-a transverse anchor; 9-connecting the lacing plates; 10-anchoring the steel plate; 11-anchoring the nut; 12-galvanized steel sheet; 13-single piers; 14-adding a support; 15-a primary support; 16-beam body.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Example 1
The embodiment provides a support, see fig. 1, including bearing structure, to drawing structure and two brackets 1, two bracket 1 transversely interval distribution, two bracket 1 set up in bearing structure is last, two bracket 1 is through to drawing the structure is to drawing the connection.
In this embodiment, the bracket 1 has right triangle's cross section, one of them right-angle side of the cross section of bracket 1 sets up vertically and sets up in, another right-angle side sets up in the top of vertical right-angle side, utilizes triangle's stability, and stability is higher, adopts right triangle's cross section, is convenient for install newly-increased support 14, and is convenient for install in the side of independent pier 13.
As shown in fig. 2 to fig. 5, the bracket 1 includes a plurality of transverse i-beams 101, a plurality of vertical i-beams 102 and a plurality of oblique i-beams 103 which are distributed at intervals along the longitudinal direction, and the number of the transverse i-beams 101, the vertical i-beams 102 and the oblique i-beams 103 can be selected according to the actual construction situation. As shown in fig. 3, three transverse i-beams 101 are arranged at intervals in the longitudinal direction of each transverse side, and the top surfaces of all the transverse i-beams 101 on each side are connected through a top steel backing plate 5.
As shown in fig. 4 and 5, three vertical i-beams 102 are arranged at intervals in the longitudinal direction of each lateral side, the upper ends of the vertical i-beams 102 are connected with the inner ends of the horizontal i-beams 101, the lower ends of the vertical i-beams are connected together through a bottom steel backing plate 6, and the middle parts of the adjacent vertical i-beams 102 are connected through a horizontal connection system. Specifically, the transverse connection system is suitable to adopt the support channel steel 2, two adjacent vertical I-steel 102 are connected at the both ends of support channel steel 2, and the stabilizing effect is better after welding. And as shown in fig. 6, the opening of the supporting channel steel 2 faces to the side, specifically faces to the outside, so that welding is facilitated, and the inside of the supporting channel steel 2 is provided with a vertical stiffening rib 3, and the upper end and the lower end of the stiffening rib 3 are correspondingly connected with the upper flange and the lower flange of the supporting channel steel 2, so that stability can be improved.
As shown in fig. 6, three oblique i-beams 103 are disposed at intervals in the longitudinal direction of each lateral side, the upper ends of the oblique i-beams 103 are connected with the outer ends of the lateral i-beams 101, and the lower ends of the oblique i-beams 103 are connected with the lower ends of the vertical i-beams 102.
As can be seen in fig. 2-6, each of the transverse i-beam 101, the vertical i-beam 102 and the oblique i-beam 103 are correspondingly arranged, each of the transverse i-beam 101, the vertical i-beam 102 and the oblique i-beam 103 enclose to form a right triangle frame structure, and the transverse connection system, the bottom steel backing plate 6 and the top steel backing plate 5 are used for connecting the longitudinal right triangle frames together, so that the supporting capability of the bracket 1 is better and more stable. And the top steel backing plate 5 is convenient for installing the newly added support 14, and can further reduce the steel consumption under the condition of meeting the required supporting capacity of the newly added support 14.
As shown in fig. 2 and 6, the supporting structure is a plurality of transverse anchors 8 vertically spaced in rows and longitudinally spaced in columns, the transverse anchors 8 are steel bars or anchor bolts, and the supporting channel steel 2 and the bottom steel backing plate 6 are respectively vertically hung on the corresponding transverse anchors 8, so that the installation is convenient. The two brackets 1 are respectively arranged on two lateral sides of the single pier 13, the lateral anchors 8 are embedded into the two lateral sides of the single pier 13, the brackets 1 are supported by the lateral anchors 8 embedded into the single pier 13, and the stability is higher. Namely, the bracket 1 of the scheme can be welded by the transverse I-steel 101, the vertical I-steel 102, the oblique I-steel 103, the supporting channel steel 2, the bottom steel backing plate 6 and the top steel backing plate 5 to form a prefabricated part, when the bracket is required to be used, the two bracket 1 prefabricated parts are symmetrically hung on the transverse anchors 8 on the two transverse sides of the single pier 13, and the bracket is fixed by opposite-pull connection of the opposite-pull structure, so that the bracket is quite convenient to operate.
As shown in fig. 2 and fig. 6, the opposite-pulling structure comprises a plurality of finish rolling deformed steel bars 4 which are transversely arranged and a plurality of anchoring pieces which are longitudinally arranged, the finish rolling deformed steel bars 4 and the anchoring pieces form a rectangular frame structure, the number of the finish rolling deformed steel bars 4 and the anchoring pieces which are longitudinally arranged can be selected according to actual requirements, as shown in fig. 2 and fig. 3, two finish rolling deformed steel bars 4 are respectively arranged on the front side and the rear side of the bracket 1, and the finish rolling deformed steel bars 4 on each front side and the rear side are aligned with the upper part of the bracket 1 and the lower part of the bracket 1; correspondingly, two anchoring parts are arranged on each side of the transverse two sides of the single pier 13, and the two anchoring parts on each side of the transverse two sides correspond to the heights of the upper and lower finish rolling deformed steel bars 4 and are aligned with the upper part of the bracket 1 and the lower part of the bracket 1.
As shown in fig. 7, the anchoring member comprises two anchor channel steel 7 arranged up and down, the openings of the two anchor channel steel 7 arranged up and down are arranged back to back, two anchor channel steel 7 middle parts are connected into a whole through connecting a lacing plate 9, two end parts of the anchor channel steel 7 are welded through an anchor steel plate 10, a hole for allowing a finish rolling screw thread steel 4 to pass through is formed in the middle of the anchor steel plate 10, a gap for allowing the finish rolling screw thread steel 4 to pass through is formed between the anchor channel steel 7, and the finish rolling screw thread steel 4 passes through the anchor steel plate 10 and tightens the anchor steel plate 10 through an anchor nut 11. The opposite-pulling structure is simple in structure, small in steel amount, low in cost and convenient to install, the anchoring channel steel 7 is directly pulled to the flange plate of the vertical I-steel 102, the pulling effect on the two brackets 1 is good, the two brackets cannot interfere with the brackets 1 during installation, and the operation is more convenient.
Adopt this application support, through the embedding horizontal anchor 8 of the horizontal both sides of single pier 13 provides vertical support to bracket 1, and transversely strain two brackets 1 through the pair of drawing structure that finish rolling deformed steel bars 4 and anchor channel-section steel 7 formed, connect two brackets 1 and support the horizontal bridge at single pier 13 to both sides for can add the support and form three support structures on two brackets 1, can set up a new support 14 through bracket 1 respectively in the horizontal both sides of former support 15 promptly, carry out the atress to the top roof beam body 16 jointly, as shown in fig. 1, can prevent single pier 13 from toppling. And this kind of structure is less in steel that the steel staple bolt adopted, and the cost is lower, and two brackets 1 pass through bearing structure vertical support and to drawing the structure to drawing to connect and form fixedly, compare in the construction mode welding volume of steel staple bolt little, the construction is more convenient, the shaping is faster.
Example 2
The embodiment provides an anti-overturning device for a single-pier bridge, referring to fig. 2-7, including the bracket described in embodiment 1, two brackets 1 of the bracket are disposed on two lateral sides of a single-pier 13, and the top surfaces of the two brackets 1 are provided with newly added supports 14.
The anti-overturning device for the single-column pier bridge is characterized in that two brackets 1 are connected and supported on the two lateral sides of the single-column pier, so that newly-added supports 14 can be additionally arranged on the two brackets 1 to form a three-support structure, the structure is stable, and the single-column pier can be prevented from overturning. The structure has the advantages of less steel, low cost, small welding quantity, more convenient construction and faster molding. As shown in fig. 8-9, the galvanized steel sheet 12 is wrapped outside the bracket, so that the bracket can be protected and more attractive. The galvanized steel sheet 12 is detachable, facilitating the detection of the stent condition.
When the steel structure is used, firstly, a steel structure is processed outside a field lofting site, a transverse I-steel 101, a vertical I-steel 102 and an inclined I-steel 103 are assembled to form a triangular structure, a plurality of triangular structures are formed into a bracket 1 through a supporting channel steel 2, a bottom steel backing plate 6 and a top steel backing plate 5, then the positions of steel bars of an original single pier 13 are positioned and detected to avoid damaging the steel bars of the original pier, steel bars or anchor bolts are drilled and implanted to serve as transverse anchors 8, and the assembled bracket 1 is hoisted to a designated position; and finally, anchoring and oppositely pulling the finish rolling deformed steel bar 4 through an anchoring device, so that an anti-overturning device of the single-column pier 13 bridge is fixed at the pier top position, and a galvanized steel plate 12 is wrapped for protection and decoration. According to the utility model, all steel structures can be manufactured and welded outside the field, flexible adjustment can be performed according to the actual support size and the structure size, the operation is simple, the construction is quick, the construction period can be shortened, and the traffic pressure can be reduced; the personnel investment is less, the economic benefit is considerable, and the application range is wide; the anti-overturning device can ensure the construction quality, and the problems that the welding quality cannot be ensured, the construction period is long and the like in the steel hoop reinforcement scheme are solved.
The specific operation steps are as follows:
the first step: setting out the installation position, elevation and the like according to the design site;
and a second step of: assembling a transverse I-steel 101, the vertical I-steel 102 and the inclined I-steel 103 to form a triangular structure, and forming a plurality of triangular structures into a bracket 1 through a supporting channel steel 2, a bottom steel backing plate 6 and a top steel backing plate 5; a stiffening rib 3 steel plate is arranged at the supporting point of the supporting channel steel 2;
and a third step of: the positions of the steel bars of the original single piers 13 are detected in a positioning way, so that the steel bars of the original single piers 13 are prevented from being damaged, and steel bars or anchor bolts are drilled and implanted to serve as transverse anchors 8;
fourth step: cleaning garbage at the top of the bridge pier, transporting the prefabricated bracket 1 components to the site, and hoisting the prefabricated bracket 1 components at the designed position at the top of the bridge pier;
fifth step: anchoring the channel steel 7, the anchoring steel plate 10 and the anchoring nut 11 through the anchoring device, and oppositely pulling the finish rolling screw thread steel 4 to fix the bracket 1 at the designed position of the pier top;
sixth step: installing a newly added support 14, and changing a single support into a three-support system;
seventh step: and (5) decorating the outer coated galvanized steel sheet 12 to finish the installation of all anti-overturning devices.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The bracket is characterized by comprising a supporting structure, a pair-pulling structure and two brackets (1), wherein the two brackets (1) are transversely distributed at intervals, the two brackets (1) are arranged on the supporting structure, and the two brackets (1) are connected through the pair-pulling structure.
2. The bracket according to claim 1, characterized in that the bracket (1) has a right triangle cross section, wherein one right-angle side of the cross section of the bracket (1) is arranged vertically and inwardly, and the other right-angle side is arranged above the vertical right-angle side.
3. The bracket according to claim 2, wherein the bracket (1) comprises a plurality of transverse i-beams (101), a plurality of vertical i-beams (102) and a plurality of oblique i-beams (103) which are longitudinally distributed at intervals, the transverse i-beams (101), the vertical i-beams (102) and the oblique i-beams (103) are correspondingly arranged, the transverse i-beams (101), the vertical i-beams (102) and the oblique i-beams (103) are enclosed to form a right triangle, the middle parts of adjacent vertical i-beams (102) are connected through a transverse connection system, the bottoms of the adjacent vertical i-beams (102) are connected through a bottom steel base plate (6), and the top surfaces of the adjacent transverse i-beams (101) are connected through a top steel base plate (5).
4. A bracket according to claim 3, characterized in that the transverse connection is a supporting channel steel (2), and two ends of the supporting channel steel (2) are connected with two adjacent vertical i-beams (102).
5. The bracket according to claim 4, wherein the opening of the supporting channel steel (2) faces to the side, a vertical stiffening rib (3) is arranged in the supporting channel steel (2), and the upper end and the lower end of the stiffening rib (3) are correspondingly connected with the upper flange and the lower flange of the supporting channel steel (2).
6. The bracket according to claim 4, characterized in that the supporting structure is a plurality of transverse anchors (8) vertically spaced in rows and longitudinally spaced in columns, the transverse anchors (8) are steel bars or anchors, and the supporting channel steel (2) and the bottom steel backing plate (6) are respectively vertically hung on the corresponding transverse anchors (8).
7. The bracket according to claim 6, characterized in that two brackets (1) are arranged on both lateral sides of the individual pier (13), respectively, and that the lateral anchors (8) are embedded in both lateral sides of the individual pier (13).
8. The bracket according to any of claims 1-7, characterized in that the counter-pulling structure comprises a number of finish-rolled screw steels (4) arranged transversely and a number of anchors arranged longitudinally, the finish-rolled screw steels (4) and the anchors form a rectangular frame structure, the anchors comprise two anchor channels (7) arranged up and down, the two anchor channels (7) are connected by an anchor steel plate (10), a gap for the finish-rolled screw steels (4) to pass through is provided between the two anchor channels (7), and the finish-rolled screw steels (4) pass through the anchor steel plate (10) and tension the anchor steel plate (10) by anchor nuts (11).
9. An anti-overturning device for a single-pier bridge, which is characterized by comprising the bracket as claimed in any one of claims 1-8, wherein two brackets (1) of the bracket are arranged on two lateral sides of a transverse bridge of a single-pier (13), and newly-added supports (14) are arranged on the top surfaces of the two brackets (1).
10. The anti-overturning device for the single pier bridge according to claim 9, wherein the galvanized steel sheet (12) is externally coated on the outer side of the bracket, and the galvanized steel sheet (12) is detachable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320485487.1U CN219218738U (en) | 2023-03-14 | 2023-03-14 | Anti-overturning device for bracket and single-pier bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320485487.1U CN219218738U (en) | 2023-03-14 | 2023-03-14 | Anti-overturning device for bracket and single-pier bridge |
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| Publication Number | Publication Date |
|---|---|
| CN219218738U true CN219218738U (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320485487.1U Active CN219218738U (en) | 2023-03-14 | 2023-03-14 | Anti-overturning device for bracket and single-pier bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219218738U (en) |
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2023
- 2023-03-14 CN CN202320485487.1U patent/CN219218738U/en active Active
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