CN212453112U - Connection structure of overhanging beam and concrete beam - Google Patents
Connection structure of overhanging beam and concrete beam Download PDFInfo
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- CN212453112U CN212453112U CN202020671417.1U CN202020671417U CN212453112U CN 212453112 U CN212453112 U CN 212453112U CN 202020671417 U CN202020671417 U CN 202020671417U CN 212453112 U CN212453112 U CN 212453112U
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Abstract
The utility model relates to a connection structure of overhanging beam and concrete beam, include: the concrete beam is internally provided with a bone beam; the connector is arranged at the end part of the concrete beam, the surface of the connector is connected and covered with a reinforced coating layer, a through hole is formed in the reinforced coating layer, the bone beam penetrates through the connector, and the end part of the bone beam is arranged in the through hole in a matched mode; the part of the connection end surface of the extension beam, which faces the end part of the bone beam, is butted with the bone beam, and the part of the connection end surface of the extension beam, which faces the surface of the reinforced coating layer, is connected with the reinforced coating layer. Although the relative part of outrigger and bone roof beam appears the skew and can not dock completely, the outrigger is gone up and is connected the terminal surface part staggered with the bone roof beam terminal surface still accessible and strengthen the coating and realize being connected with concrete beam is whole to the requirement to joint strength and security has reduced the emergence probability of safety problem when can satisfying the construction.
Description
Technical Field
The utility model relates to a building structure engineering design field especially relates to connection structure of overhanging beam and concrete beam.
Background
In actual construction design, a steel beam is often required to be additionally arranged on a concrete beam. Overhanging girder steel and the concrete beam of original are generally through linking to each other directly in the steel skeleton roof beam of pre-burying in the concrete beam, but because construction error's reason probably can cause pre-buried producing the off normal between the steel skeleton roof beam in concrete and the overhanging girder steel position of postassembling, this can directly lead to the postassembling overhanging girder steel can't dock with the steel skeleton roof beam accuracy, and can reduce joint strength during the butt joint deviation, then cause the safety problem.
In order to solve the above problems, a method such as chiseling concrete and rebuilding may be adopted, which increases the difficulty of construction, increases a lot of workload and working time, and affects the final use effect of the building.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a connection structure of an overhanging beam and a concrete beam, which solves the problem of the troublesome butt joint when the steel skeleton beam and the overhanging steel beam of the concrete are deviated.
A connection structure of an outrigger beam and a concrete beam, comprising:
the concrete beam is internally provided with a bone beam;
the connector is arranged at the end part of the concrete beam, the surface of the connector is connected and covered with a reinforced coating layer, a through hole is formed in the reinforced coating layer, the bone beam penetrates through the connector, and the end part of the bone beam is arranged in the through hole in a matched mode;
the part of the connection end surface of the extension beam, which faces the end part of the bone beam, is butted with the bone beam, and the part of the connection end surface of the extension beam, which faces the surface of the reinforced coating layer, is connected with the reinforced coating layer.
The connection structure of the overhanging beam and the concrete beam at least has the following beneficial technical effects:
when the offset occurs between the bone beam and the outrigger inside the concrete beam, the portions of the bone beam opposite to the outrigger are offset and cannot be completely butted together. In this case, when the solution of the present embodiment is adopted, the portion of the connection end surface of the overhanging beam facing the end of the bone beam is butted against the bone beam; meanwhile, the part of the connection end surface of the overhanging beam, which faces the surface of the reinforced coating layer, is connected with the reinforced coating layer, the reinforced coating layer is connected and covered on the surface of the connector to form an integral stress structure with the connector, and the connector is firmly connected with the end part of the concrete beam, so that the part of the connection end surface of the overhanging beam, which faces the surface of the reinforced coating layer, can be connected with the concrete beam through the reinforced coating layer.
In this embodiment, although the relative part of outrigger and bone roof beam appears the skew and can not dock completely, the connection terminal surface part that staggers with the bone roof beam terminal surface on the outrigger still can realize being connected with concrete beam is whole through strengthening the coating to can satisfy the requirement to joint strength and security during the construction, reduce the emergence probability of safety problem.
In one embodiment, the end surface of the bone beam is flush with the outer end of the through hole, and the end of the bone beam is connected with the through hole.
In the embodiment, the end part of the bone beam is connected with the strengthening coating layer through the through hole, which is equivalent to enlarging the area of the end part of the bone beam, so that the connection between the extension beam and the bone beam is firmer and more reliable; meanwhile, the bone beam is connected with the connecting body and the concrete beam through the reinforced coating layer to form an integral stress structure, the stability of the bone beam in the integral structure is enhanced, the integral connection strength and rigidity of the embodiment are improved, and the use safety is better. In addition, the end face of the bone beam is flush with the outer end of the through hole, so that the welding operation between the extending beam and the end face of the bone beam is facilitated.
In one embodiment, the through-hole has a shape that conforms to and is sized to match the cross-sectional shape of the bone beam. Further, the cross section of the extension beam and the bone beam can be in any one of a frame shape, an I-shaped shape and a round shape.
In one embodiment, a reinforcing plate is arranged in the overhanging beam along the length direction, the part of the end part of the reinforcing plate facing to the end part of the bone beam is butted with the bone beam, and the part of the end part of the reinforcing plate facing to the surface of the reinforcing cladding layer is connected with the reinforcing cladding layer.
In this embodiment, the reinforcing plate had both increased the rigidity of the overhanging girder steel of back-connection, had also promoted the joint strength of overhanging roof beam and bone roof beam, concrete beam, and the security is better.
In one embodiment, the length direction of the connecting body is perpendicular to the length direction of the concrete beam, the reinforcing coating layer comprises a plurality of steel plates, the plurality of steel plates are arranged on the surface of the connecting body around the circumference of the connecting body, and the plurality of steel plates are connected in sequence.
In the embodiment, the steel plate is convenient to mount and can be firmly wrapped and covered on the surface of the connector; the length direction of the connector is perpendicular to that of the concrete beam, normal arrangement and functions of the concrete beam cannot be influenced, other components can be additionally arranged on the connector, and further expansion of functions is facilitated.
In one embodiment, the width of the steel plate is at least 50mm greater than the maximum of the width of the cross section of the outrigger and the width of the cross section of the bone beam; the height of the steel plate is at least 50mm greater than the maximum value of the height of the cross section of the overhanging beam and the height of the cross section of the bone beam. Because the planar dimension of steel sheet is than the outrigger the cross-sectional dimension of bone roof beam is big, can guarantee on the one hand that the outrigger can have stronger connection stability on the steel sheet, on the other hand, have great connection area between steel sheet and the connector, the whole atress condition of structure that forms jointly with the connector is better.
In one embodiment, the thickness of the steel plate is greater than or equal to the minimum of the wall thicknesses of the outrigger and the bone beam.
In one embodiment, the steel plate is anchored to the connecting body, and the steel plate is adhered to the surface of the connecting body. The mode that anchor and adhesion combined together can promote the joint strength of the two, and the holistic stability of structure and atress condition are better.
In one embodiment, the steel plate is anchored to the surface of the connecting body by a chemical anchor.
In one embodiment, each steel plate is anchored to the surface of the connecting body through a plurality of chemical anchors distributed on the steel plates in an array. The multiple chemical anchor bolts can increase the anchoring force of the single steel plate, so that the connecting force is improved.
In one embodiment, a plurality of the steel plates are welded in sequence to form the reinforced clad layer. The steel plates are connected into a whole after being welded, and firmly coated on the surface of the connecting body to form an integral stress structure with the connecting body.
In one embodiment, the connecting body is cast on the bone beam. Because the connector is poured at bone roof beam outside an organic whole and is formed, the connector is connected closely with the bone roof beam, and the bone roof beam forms whole atress system with connector, concrete beam, has reinforceed the stability that sets up of bone roof beam in overall structure, and then has promoted holistic joint strength, rigidity and stability of this embodiment, and the safety in utilization is better.
Drawings
Fig. 1 is a schematic view illustrating a connection structure of an overhanging beam and a concrete beam according to an embodiment of the present invention;
fig. 2 is a plan view of a connection structure of the outrigger beam and the concrete beam of fig. 1;
fig. 3 is a left side view of a connection of the outrigger and the concrete beam of fig. 1.
In the figure, 100, a concrete beam; 110. a bone bridge;
200. a linker; 210. strengthening the coating layer; 211. a through hole; 210a, a steel plate; 220. a chemical anchor bolt;
300. an overhanging beam; 310. a reinforcing plate.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
To facilitate an understanding of the present invention, various embodiments defined by the claims of the present invention will be described more fully hereinafter with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is understood that the same is by way of example only and is not to be taken by way of limitation. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Accordingly, those of ordinary skill in the art will recognize that changes and modifications may be made to the various embodiments described herein without departing from the scope of the present invention, which is defined by the following claims. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
It will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims.
Throughout the description and claims of this specification, the words "comprise" and variations of the words, for example "comprising" and "comprises", mean "including but not limited to", and are not intended to (and do not) exclude other components, integers or steps. Features, integers or characteristics described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith.
It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. The expression "comprising" and/or "may comprise" as used in the present invention is intended to indicate the presence of corresponding functions, operations or elements, and is not intended to limit the presence of one or more functions, operations and/or elements. Furthermore, in the present application, the terms "comprises" and/or "comprising" are intended to indicate the presence of the features, quantities, operations, elements, and components, or combinations thereof, disclosed in the specification. Thus, the terms "comprising" and/or "having" should be understood as presenting additional possibilities for one or more other features, quantities, operations, elements, and components, or combinations thereof.
In the present application, the expression "or" encompasses any and all combinations of the words listed together. For example, "a or B" may comprise a or B, or may comprise both a and B.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" or "coupled" to another element, it can be directly or indirectly coupled to the other element or intervening elements may also be present.
References herein to "upper", "lower", "left", "right", etc. are merely intended to indicate relative positional relationships, which may change accordingly when the absolute position of the object being described changes.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present specification and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, in an embodiment of the present invention, a connection structure of an outrigger 300 and a concrete beam 100 is provided, which includes the concrete beam 100, a connection body 200, and the outrigger 300. The concrete beam 100 is provided therein with a bone beam 110. The connecting body 200 is arranged at the end part of the concrete beam 100, the surface of the connecting body 200 is connected and covered with a reinforced coating 210, a through hole 211 is arranged on the reinforced coating 210, the bone beam 110 penetrates through the connecting body 200, and the end part of the bone beam 110 is matched and arranged in the through hole 211. The portion of the connection end surface of the outrigger 300 facing the end of the bone beam 110 is butted against the bone beam 110, and the portion of the connection end surface of the outrigger 300 facing the surface of the reinforcement coating 210 is connected to the reinforcement coating 210.
In the case where the misalignment occurs between the bone beam 110 and the outrigger 300 inside the concrete beam 100, the portions of the bone beam 110 opposite to the outrigger 300 are offset and thus cannot be completely butted together. In this case, when the solution of the present embodiment is adopted, the portion of the connection end surface of the outrigger 300 facing the end of the bone beam 110 is butted against the bone beam 110; meanwhile, the part of the connection end surface of the outrigger 300 facing the surface of the reinforced coating 210 is connected with the reinforced coating 210, and the reinforced coating 210 is connected and covered on the surface of the connecting body 200 to form an integral stressed structure with the connecting body 200, and the connecting body 200 is firmly connected with the end of the concrete beam 100, so that the part of the connection end surface of the outrigger 300 facing the surface of the reinforced coating 210 can be connected with the concrete beam 100 through the reinforced coating 210.
Based on the principle, although the relative parts of the overhanging beam 300 and the bone beam 110 are deviated and can not be completely butted, the connection end surface part of the overhanging beam 300 staggered with the end surface of the bone beam 110 can still be integrally connected with the concrete beam 100 through the reinforced coating layer 210, so that the requirements on the connection strength and the safety during construction can be met, and the occurrence probability of safety problems is reduced.
Referring to fig. 1, in some embodiments, the end surface of the bone beam 110 is flush with the outer end of the through hole 211, and the end of the bone beam 110 is connected to the through hole 211. Specifically, the end of the bone beam 110 may be connected to the inner wall of the through-hole 211 or the outer end of the through-hole 211 by welding or chemical bonding. In this embodiment, the end of the bone beam 110 is connected to the through hole 211 to connect to the reinforced coating 210, which is equivalent to enlarging the area of the end of the bone beam 110, so that the connection between the overhanging beam 300 and the bone beam 110 is more secure and reliable; meanwhile, the bone beam 110 is connected with the connecting body 200 and the concrete beam 100 through the reinforced coating layer 210 to form an integral stress structure, so that the stability of the bone beam 110 in the integral structure is enhanced, the integral connection strength and rigidity of the embodiment are improved, and the use safety is better. In addition, the end surface of the bone beam 110 is flush with the outer end of the through hole 211, which facilitates the welding operation between the outrigger 300 and the end surface of the bone beam 110.
Referring to fig. 3, in some embodiments, the through-holes 211 are shaped to conform to and match the cross-sectional shape of the bone beam 110. Preferably, the cross-sectional shapes of the outrigger 300 and the bone beam 110 include any one of a frame shape, an i-shape and a circular shape. Of course, in other embodiments, other cross-sections may be used, and are not limited thereto.
Referring to fig. 1 and 2, in some embodiments, a reinforcing plate 310 is disposed inside the outrigger 300 along a length direction, a portion of an end of the reinforcing plate 310 facing an end of the bone beam 110 is abutted against the bone beam 110, and a portion of an end of the reinforcing plate 310 facing a surface of the reinforcement coating 210 is connected to the reinforcement coating 210. Specifically, the end of the reinforcing plate 310 facing the end of the bone beam 110 is welded to the bone beam 110; and at the same time, the end of the reinforcing plate 310 facing the surface of the reinforcing coating 210 is coupled to the reinforcing coating 210, thereby being coupled to the concrete beam 100 through the reinforcing coating 210.
In this embodiment, the reinforcing plate 310 not only increases the rigidity of the rear-connected overhanging steel beam, but also improves the connection strength between the overhanging beam 300 and the bone beam 110 and the concrete beam 100, and the safety is better.
Referring to fig. 1, in some embodiments, a length direction of the connection body 200 is perpendicular to a length direction of the concrete beam 100, the reinforcement coating layer 210 includes a plurality of steel plates 210a, the plurality of steel plates 210a are disposed on a surface of the connection body 200 around a circumference of the connection body 200, and the plurality of steel plates 210a are connected in sequence. Specifically, the steel plate 210a may be covered on the surface of the connecting body 200 after the connecting body 200 is formed by casting, or the steel plate 210a may be directly disposed on the surface of the prefabricated connecting body 200, and then the connecting body 200 and the concrete beam 100 are assembled in a matching manner.
In this embodiment, the steel plate 210a is convenient to install and can be firmly wrapped and covered on the surface of the connecting body 200; the length direction of the connecting body 200 is perpendicular to the length direction of the concrete beam 100, so that the normal arrangement and functions of the concrete beam 100 are not affected, and other components can be additionally arranged on the connecting body 200, thereby being beneficial to the further expansion of the functions.
Referring to fig. 3, in some embodiments, the width of the steel plate 210a is at least 50mm greater than the maximum of the width of the cross-section of the outrigger 300 and the width of the cross-section of the bone beam 110; the height of the steel plate 210a is at least 50mm greater than the maximum of the height of the cross-section of the outrigger 300 and the height of the cross-section of the bone beam 110. The plane size of the steel plate 210a is larger than the sectional sizes of the outrigger 300 and the bone beam 110, so that on one hand, the outrigger 300 can have stronger connection stability on the steel plate 210a, and on the other hand, the steel plate 210a and the connecting body 200 have larger connection area, and the overall stress condition of the structure formed together with the connecting body 200 is better.
In some embodiments, the thickness of the steel plate 210a is greater than or equal to the minimum of the wall thicknesses of the outrigger 300 and the bone beam 110. The steel plate 210a ensures a certain thickness to improve the connection strength and rigidity, thereby ensuring the stability of the entire structure.
Referring to fig. 1, in some embodiments, the steel plate 210a is anchored to the connection body 200, and the steel plate 210a is adhered to the surface of the connection body 200. Specifically, the steel plate 210a is adhered to the surface of the connection body 200 by a bonding material such as structural adhesive, and the steel plate 210a and the connection body 200 are connected by anchoring using an anchoring member. The mode that anchor and adhesion combined together can promote the joint strength of the two, and the holistic stability of structure and atress condition are better.
Referring to fig. 1, in some embodiments, a plurality of the steel plates 210a are welded in sequence to form a strengthened clad 210. The steel plates 210a are welded and then connected into a whole, and firmly cover the surface of the connecting body 200 to form an integral stress structure with the connecting body 200.
In some embodiments, the steel plate 210a is anchored to the surface of the connecting body 200 by a chemical anchor 220. The chemical anchor bolt 220 is a high-strength anchor bolt using vinyl resin as a main raw material, which is called a chemical suppository in the early days, and is a novel anchor bolt appearing after an expansion anchor bolt, specifically, in the embodiment, a hole is formed in the surface of the connecting body 200 in advance, and a screw rod penetrating through the steel plate 210a from the outside is fixed in the hole of the connecting body 200 in a cementing manner by using a chemical adhesive, so as to realize anchoring of the steel plate 210a to be treated. In this embodiment, the steel plate 210a can be firmly fixed to the surface of the connector 200 by the chemical anchor 220, and the connection strength is high and the stability is good.
Further, each of the steel plates 210a is anchored on the surface of the connecting body 200 by a plurality of chemical anchors 220 distributed on the steel plate 210a in an array. The plurality of chemical anchors 220 can increase the anchoring force of the single steel plate 210a, thereby increasing the connection force.
It is understood that in other embodiments, the reinforcing cladding 210 may comprise an integrally formed steel shell that can be bonded or anchored to the surface of the connector 200, without limitation.
In some embodiments, the connector 200 is cast over the bone beam 110. Specifically, when the bone beam 110 and the overhanging beam 300 are misaligned, the connecting body 200 is poured outside the bone beam 110 and covers the reinforcing coating 210, and then the connecting end surface of the overhanging beam 300 is butted with the bone beam 110 and the reinforcing coating 210.
In this embodiment, because the connecting body 200 is poured outside the bone beam 110 integrally, the connecting body 200 is connected with the bone beam 110 tightly, the bone beam 110, the connecting body 200 and the concrete beam 100 form an integral stress system, the stability of the bone beam 110 in the integral structure is enhanced, the integral connection strength, rigidity and stability of the embodiment are further improved, and the use safety is better. In other embodiments, the connecting body 200 may be prefabricated, and when the offset occurs between the bone beam 110 and the overhanging beam 300 inside the concrete beam 100, the connecting body 200 is installed on the bone beam 110 as required, and then the connecting end surface of the overhanging beam 300 is butted with the bone beam 110 and the reinforced coating layer 210, so as to implement the functions of the present invention, which is not limited herein.
In some embodiments, the outrigger 300 and the bone beam 110 are steel beams, respectively. Of course, in other embodiments, the outrigger 300 and the bone beam 110 may be made of other materials, and are not limited herein.
In the above description, although it is possible to describe each element of the present invention using expressions such as "first" and "second", they are not intended to limit the corresponding elements. For example, the above expressions are not intended to limit the order or importance of the corresponding elements. The above expressions are used to distinguish one element from another.
The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular references include plural references unless there is a significant difference in context, scheme or the like between them.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Those skilled in the art will appreciate that various features of the above-described embodiments may be omitted, added, or combined in any way, and for the sake of brevity, all possible combinations of features of the above-described embodiments will not be described, however, so long as there is no contradiction between these combinations of features, and simple variations and structural variations which are adaptive and functional to the prior art, which can occur to those skilled in the art, should be considered within the scope of this description.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that while the invention has been shown and described with reference to various embodiments, it will be understood by those skilled in the art that various changes and modifications in form and detail may be made without departing from the spirit of the invention and these are within the scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (12)
1. The utility model provides a connection structure of overhanging beam and concrete beam which characterized in that includes:
the concrete beam is internally provided with a bone beam;
the connector is arranged at the end part of the concrete beam, the surface of the connector is connected and covered with a reinforced coating layer, a through hole is formed in the reinforced coating layer, the bone beam penetrates through the connector, and the end part of the bone beam is arranged in the through hole in a matched mode;
the part of the connection end surface of the extension beam, which faces the end part of the bone beam, is butted with the bone beam, and the part of the connection end surface of the extension beam, which faces the surface of the reinforced coating layer, is connected with the reinforced coating layer.
2. A connection structure of an outrigger and a concrete beam as claimed in claim 1, wherein the end surface of the bone beam is flush with the outer end of the through-hole, and the end of the bone beam is connected with the through-hole.
3. A connection structure of an outrigger beam and a concrete beam as claimed in claim 1, wherein the shape of the through-hole is identical to and matched with the cross-sectional shape of the bone beam.
4. The connection structure of an outrigger and a concrete beam according to claim 1, wherein a reinforcing plate is provided in the outrigger in a length direction, a portion of an end of the reinforcing plate facing the end of the bone beam is butted against the bone beam, and a portion of the end of the reinforcing plate facing the surface of the reinforcing clad is connected to the reinforcing clad.
5. The structure of claim 1, wherein the length direction of the connection body is perpendicular to the length direction of the concrete beam, the reinforcing coating layer comprises a plurality of steel plates, the plurality of steel plates are arranged on the surface of the connection body around the circumference of the connection body, and the plurality of steel plates are connected in sequence.
6. The outrigger and concrete beam connection structure of claim 5, wherein the width of the steel plate is at least 50mm greater than the maximum value of the width of the cross section of the outrigger and the width of the cross section of the bone beam; the height of the steel plate is at least 50mm greater than the maximum value of the height of the cross section of the overhanging beam and the height of the cross section of the bone beam.
7. The outrigger and concrete beam connection structure of claim 5, wherein the thickness of the steel plate is greater than or equal to the minimum value of the wall thickness of the outrigger and the bone beam.
8. The outrigger and concrete beam connection structure of claim 5, wherein the steel plate is anchored to the connection body, and the steel plate is adhered to a surface of the connection body.
9. The outrigger and concrete beam connection structure of claim 8, wherein the steel plate is anchored to the surface of the connection body by a chemical anchor.
10. The structure of connecting an outrigger with a concrete beam according to claim 9, wherein each of the steel plates is anchored to the surface of the connector by a plurality of chemical anchors distributed in the steel plates in an array, respectively.
11. The connection structure of an outrigger beam and a concrete beam according to claim 5, wherein a plurality of the steel plates are welded in sequence to form a reinforcing coating layer.
12. The outrigger and concrete beam connection structure of claim 1, wherein the connection body is cast on the bone beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020671417.1U CN212453112U (en) | 2020-04-27 | 2020-04-27 | Connection structure of overhanging beam and concrete beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020671417.1U CN212453112U (en) | 2020-04-27 | 2020-04-27 | Connection structure of overhanging beam and concrete beam |
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| CN212453112U true CN212453112U (en) | 2021-02-02 |
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