CN116427259A - PBL shear key based on double-perforated steel plate - Google Patents
PBL shear key based on double-perforated steel plate Download PDFInfo
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- CN116427259A CN116427259A CN202310463468.3A CN202310463468A CN116427259A CN 116427259 A CN116427259 A CN 116427259A CN 202310463468 A CN202310463468 A CN 202310463468A CN 116427259 A CN116427259 A CN 116427259A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 259
- 239000010959 steel Substances 0.000 title claims abstract description 259
- 230000000149 penetrating effect Effects 0.000 claims abstract description 18
- 238000005192 partition Methods 0.000 claims description 32
- 239000011148 porous material Substances 0.000 claims description 9
- 238000010276 construction Methods 0.000 abstract description 34
- 230000002787 reinforcement Effects 0.000 abstract description 13
- 238000010008 shearing Methods 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a PBL shear key based on double-perforated steel plates, which is characterized in that on the basis of a PBL shear key combined by common double-perforated steel plates, through steel bars are improved, two through steel bar sections bent at one end are adopted to replace common broken-line-shaped through steel bars with both ends bent and extended, all through steel bar sections are connected into a whole by arranging longitudinal steel bars, and the longitudinal steel bars are beneficial to improving the structural strength, longitudinal pulling resistance and shearing resistance of the PBL shear key; the two through reinforcement sections are adopted to replace common through reinforcement, so that sectional construction of the through reinforcement can be realized, namely, the two through reinforcement sections are respectively penetrated through the through holes on the steel plates at the corresponding sides and fixedly overlapped with the longitudinal reinforcement, each through reinforcement section only needs to penetrate through one through hole, the through reinforcement sections are blocked and limited less by the bending parts of the through reinforcement during perforation, the complexity of penetrating through the two through holes is avoided, perforation is simplified, construction difficulty is reduced, construction efficiency is improved, and construction period is saved.
Description
Technical Field
The invention belongs to the technical field of steel-concrete composite beam connectors, and particularly relates to a PBL shear key based on a double-perforated steel plate.
Background
With the wide application of the steel-concrete combined structure in bridge engineering, the corrugated steel web combined bridge begins to adopt the corrugated steel web to replace the original concrete web in large quantity, so that the dead weight of the upper structure of the bridge is lightened, the shearing resistance of the rigid material is fully utilized by the corrugated steel web, and the prestress efficiency is improved; and PBL shear keys are adopted in the corrugated steel web combined box girder bridge to replace traditional connecting keys such as profile steel connecting keys, welding nail connecting keys and the like in the concrete structure bridge.
The PBL shear key mainly comprises an open-pore steel plate and a penetrating steel bar, wherein the open-pore steel plate is welded on an upper flange plate or a lower flange plate which is welded with a corrugated steel web, and the penetrating steel bar is arranged in an open pore on the open-pore steel plate, and two ends of the penetrating steel bar are bent and extended; in order to improve the shearing resistance, currently, a corrugated steel web combined box girder bridge mostly adopts a PBL shear key with double-perforated steel plates (two perforated steel plates) in combination, such as a Twin-PBL shear key, a PBH shear key and a U-PBL shear key; as shown in fig. 1, in the construction of the PBL shear key using the common double-perforated steel plate, since the through steel bars 11 are mostly in the form of a fold line, particularly, the through steel bars on the perforated steel plate 10 connected with the lower flange plate 2 have larger bending amplitude, are blocked and limited by the bending parts of the through steel bars, and have larger difficulty in continuously passing through the holes on the two perforated steel plates, which not only results in slow construction speed, but also is difficult to ensure construction quality.
Therefore, it is necessary to design a PBL shear key for a double-perforated steel plate with simple construction to improve the construction efficiency while ensuring the shearing resistance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a PBL shear key based on a double-hole steel plate, solve the technical problem that the prior PBL shear key used by the double-hole steel plate in combination has difficult perforation of a through reinforcing steel bar, and obtain the effect of reducing the construction difficulty.
In order to solve the technical problems, the invention adopts the following technical scheme:
the PBL shear key based on the double-perforated steel plate comprises a corrugated steel web, wherein one side of the corrugated steel web in the width direction is fixedly connected with a lower flange plate, one surface of the lower flange plate, which is far away from the corrugated steel web, faces downwards and is vertically and fixedly connected with two steel plates, and the two steel plates are arranged at intervals in parallel and extend along the length direction of the corrugated steel web; a longitudinal steel bar is arranged between the two steel plates along the length direction, a plurality of through holes are formed in the steel plates at intervals along the length direction of the steel plates in a penetrating mode, through steel bar sections which extend transversely are respectively arranged in all the through holes in a penetrating mode, one end of each through steel bar section is located on the outer side of the steel plate, and the other end of each through steel bar section is located on the inner side of the steel plate and fixedly overlapped with the longitudinal steel bar.
Further, a plurality of transverse partition plates are connected between two steel plates, the transverse partition plates are arranged at intervals along the length direction of the steel plates, supporting holes are formed in the transverse partition plates in a penetrating mode along the length direction of the steel plates, longitudinal steel bars penetrate through the supporting holes of all the transverse partition plates, and the other ends of the penetrating steel bar sections are located on the longitudinal steel bars and fixedly connected in a lap joint mode.
Further, one end of the through steel bar section positioned on the inner side of the steel plate passes through the longitudinal steel bar and bends and extends downwards to form a limiting part, and the limiting part is abutted with the longitudinal steel bar and is bound and fixed so as to realize the fixed lap joint of the through steel bar section and the longitudinal steel bar.
Further, the number of the supporting holes on the transverse partition plates is two, the supporting holes are arranged at intervals transversely, the supporting holes at the same position transversely on all the transverse partition plates are one group, and longitudinal steel bars are respectively arranged in the two groups of supporting holes in a penetrating mode; one end of the through steel bar section positioned on the inner side of the steel plate passes through two longitudinal steel bars and bends to downwards extend to form a limiting part, and the limiting part is abutted with and bound and fixed with the adjacent longitudinal steel bars.
Further, the free end of the limiting part is lower than the lower end face of the steel plate.
Further, the plurality of transverse partition plates are uniformly arranged at intervals along the length direction of the steel plate, the plurality of through holes are uniformly arranged at intervals along the length direction of the steel plate, and the through holes on the two steel plates are opposite to each other in the transverse direction.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the PBL shear key based on the double-perforated steel plate, the through steel bars are improved on the basis of the PBL shear key combined by the common double-perforated steel plate, two through steel bar segments are adopted to replace the common through steel bars, and the sectional construction of the through steel bars can be realized, namely, the two through steel bar segments respectively penetrate through holes in the steel plate on the corresponding side and are fixedly overlapped with the longitudinal steel bars, each through steel bar segment only needs to penetrate through one through hole, the through steel bar segments are blocked and limited by the bending parts of the through steel bars in the perforation process, the complexity of penetrating through the two through holes is avoided, the perforation is simplified, the construction difficulty is reduced, the construction efficiency is improved, and the construction period is saved.
2. In the PBL shear key based on the double-perforated steel plate, two through steel bar segments with one bent end are adopted to replace common broken-line-shaped through steel bars with both bent ends and extend, and all the through steel bar segments are connected into a whole by arranging the longitudinal steel bars, so that the structural strength and the shearing resistance of the PBL shear key are improved, the problem that the construction difficulty is increased due to the fact that the through steel bar segments are only supported by one through hole and unstable during construction is avoided, and in addition, the longitudinal steel bars are beneficial to improving the longitudinal pulling resistance of the PBL shear key.
3. In the PBL shear key based on the double-perforated steel plate, the plurality of transverse partition plates are connected between the two steel plates, when in construction, the longitudinal steel bars pass through the supporting holes on all the transverse partition plates, the longitudinal steel bars provide supporting force by the plurality of transverse partition plates, the position of the longitudinal steel bars is not required to be maintained to be stable by manpower or other tools, then the through steel bar sections pass through the corresponding through holes in sequence, and one end positioned on the inner side of the steel plates is stacked on the longitudinal steel bars, and the two steel plates are fixedly connected, so that the construction difficulty is reduced.
4. In the PBL shear key based on the double-perforated steel plate, the transverse partition plate is equivalent to the reinforcing rib arranged between the two steel plates, so that the integral structural strength of the PBL shear key is improved, the transverse position of the longitudinal steel bar is limited by the transverse partition plate, and meanwhile, the transverse movement of the through steel bar section is limited, so that all parts of the PBL shear key are connected more tightly, the integrity is better, and the PBL shear key has better stability both in the construction stage and after the construction is completed.
Drawings
FIG. 1 is a schematic perspective view of a PBL shear key used in combination with a common double-hole steel plate according to an embodiment;
fig. 2 is a schematic perspective view of a PBL shear key based on a double-hole steel plate according to an embodiment;
FIG. 3 is a right side view of a PBL shear key based on a double-hole steel plate according to an embodiment;
FIG. 4 is a schematic perspective view in elevation of the view of FIG. 3 taken along section A-A;
FIG. 5 is a schematic perspective view of the view from below at section A-A of FIG. 3;
the corrugated steel web 1, the lower flange plate 2, the steel plate 3, the longitudinal steel bars 4, the through holes 5, the through steel bar segments 6, the transverse partition plates 7, the supporting holes 8, the limiting parts 9, the perforated steel plates 10 and the through steel bars 11.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples:
referring to fig. 2 to 5, a PBL shear key based on a double-hole steel plate comprises a corrugated steel web 1, wherein one side of the corrugated steel web 1 in the width direction is fixedly connected with a lower flange plate 2, one surface of the lower flange plate 2, which is far away from the corrugated steel web 1, faces downwards and is vertically and fixedly connected with two steel plates 3, and the two steel plates 3 are arranged at intervals in parallel and extend along the length direction of the corrugated steel web 1; a longitudinal steel bar 4 is arranged between the two steel plates 3 along the length direction, a plurality of through holes 5 which are arranged at intervals along the length direction of the steel plates 3 are penetrated through the steel plates 3, through steel bar segments 6 which extend transversely are penetrated through all the through holes 5 respectively, one end of each through steel bar segment 6 is positioned at the outer side of the steel plate 3, and the other end of each through steel bar segment 6 is positioned at the inner side of the steel plate 3 and fixedly lapped with the longitudinal steel bar 4; in the implementation process, the through steel bar section 6 and the longitudinal steel bars 4 can be fixedly overlapped by means of steel wire binding or welding.
According to the PBL shear key based on the double-perforated steel plate, on the basis of a common double-perforated steel plate combined PBL shear key, through steel bars are improved, two through steel bar sections 6 with bent ends are adopted to replace common broken-line-shaped through steel bars with both ends bent and extended, all through steel bar sections 6 are connected into a whole through the arrangement of the longitudinal steel bars 4, the problem that the construction difficulty is increased due to the fact that the through steel bar sections 6 are only supported by one through hole 5 to be unstable during construction is avoided, in addition, the longitudinal steel bars 4 are beneficial to improving the longitudinal pulling resistance of the PBL shear key, and the structural strength and the shearing resistance of the PBL shear key are beneficial to being improved by connecting all through steel bar sections 6 into a whole; the two through steel bar segments 6 are adopted to replace common through steel bars, so that the sectional construction of the through steel bars can be realized, namely, the two through steel bar segments 6 respectively penetrate through the through holes 5 on the steel plates 3 at the corresponding sides and are fixedly overlapped with the longitudinal steel bars 4, each through steel bar segment 6 only needs to penetrate through one through hole 5, the through steel bar segments are blocked and limited by the bending parts of the through steel bars during perforation, the complexity of penetrating through the two through holes 5 is avoided, the perforation is simplified, the construction difficulty is reduced, the construction efficiency is improved, the construction period is saved, the penetrating of the through steel bars on the two steel plates 3 can be respectively carried out by two constructors at the same time, and the construction efficiency can be further improved; the invention can effectively solve the problem that the PBL shear key used by the double-hole steel plate at present has difficult perforation of the through reinforcing steel bar, and achieves the effects of reducing the construction difficulty and improving the construction quality.
Referring to fig. 2 to 5, in order to further reduce the construction difficulty, a plurality of transverse partition plates 7 are connected between two steel plates 3, the transverse partition plates 7 are arranged at intervals along the length direction of the steel plates 3, support holes 8 are formed in the transverse partition plates 7 in a penetrating manner along the length direction of the steel plates 3, longitudinal steel bars 4 penetrate through the support holes 8 in all the transverse partition plates 7, and the other ends of the penetrating steel bar sections 6 are positioned on the longitudinal steel bars 4 and fixedly overlapped; in this way, during construction, the longitudinal steel bars 4 pass through the supporting holes 8 on all the transverse partition plates 7, the longitudinal steel bars 4 are provided with supporting force by a plurality of transverse partition plates 7, the position of the longitudinal steel bars 4 is kept stable without the help of manpower or other tools, then the through steel bar segments 6 pass through the corresponding through holes 5 in turn, one end positioned on the inner side of the steel plate 3 is stacked on the longitudinal steel bars 4, and the two are fixedly connected; in addition, the transverse partition 7 is equivalent to the reinforcing rib arranged between the two steel plates 3, so that the overall structural strength of the PBL shear key is improved, the transverse position of the longitudinal steel bar 4 is limited through the transverse partition 7, and meanwhile, the transverse movement of the through steel bar section 6 is also limited, so that the components of the PBL shear key are more tightly connected, the integrity is better, and the PBL shear key has better stability no matter in the construction stage or after the construction is completed.
Referring to fig. 2 to 5, one end of the through reinforcement section 6 located inside the steel plate 3 passes through the longitudinal reinforcement 4 and bends and extends downwards to form a limiting part 9, and the limiting part 9 is abutted against and bound to the longitudinal reinforcement 4 so as to realize fixed lap joint of the through reinforcement section 6 and the longitudinal reinforcement 4; the folded-line-shaped through steel bar segments 6 are all prefabricated, and the operation of installing the through steel bar segments 6 with limiting parts 9 by punching is simply introduced as follows: firstly, the gesture of the through steel bar segment 6 is adjusted, the limiting part 9 is parallel with the axis of the corresponding through hole 5 as much as possible, so that the limiting part 9 passes through the corresponding through hole 5, then, the gesture of the through steel bar segment 6 is adjusted again, the straight line segment of the through steel bar 6 (namely, the segment connected with the limiting part 9 in fig. 4) is parallel with the axis of the corresponding through hole 5, then, the through steel bar 6 rotates by taking the straight line segment as the axis, the limiting part 9 is higher than the longitudinal steel bar 4 in whole, then, the through steel bar 6 is pushed to move inwards until the limiting part 9 passes through the longitudinal steel bar 4, finally, the through steel bar 6 rotates again by taking the straight line segment as the axis, the free end of the limiting part 9 faces downwards, and then, the limiting part 9 is adjusted to be abutted with the longitudinal steel bar 4 and bound and fixed.
In this way, the through steel bar section 6 is abutted with the longitudinal steel bar 4 through the limiting part 9, so that the installation and the positioning of the through steel bar section 6 during construction are facilitated, and the situation that one end of the through steel bar section 6 positioned on the inner side of the steel plate 3 is separated from the longitudinal steel bar 4 before the two are fixed or the two are not fixed firmly can be avoided, so that the through steel bar section 6 falls off or loses the transverse stress capability; in addition, after pouring, the limit part 9 is buried in the concrete like a bent part of a common through reinforcing steel bar, so that more connection points are provided for the connection of the PBL shear key and the concrete, and the connection strength of the PBL shear key and the bridge concrete structure is increased; to further improve the connection strength, in the present embodiment, the free end of the stopper portion 9 extends downward and is lower than the lower end surface of the steel plate 3.
Referring to fig. 2 to 5, in the present embodiment, the number of the supporting holes 8 on the transverse partition plate 7 is two and the supporting holes 8 on the transverse partition plate 7 are arranged at intervals in the transverse direction, and the supporting holes 8 on the same position in the transverse direction on all the transverse partition plate 7 are one group, and the longitudinal steel bars 4 are respectively penetrated in the two groups of supporting holes 8; one end of the through steel bar section 6 positioned at the inner side of the steel plate 3 passes through the two longitudinal steel bars 4 and bends and extends downwards to form a limiting part 9, and the limiting part 9 is abutted with the adjacent longitudinal steel bars 4 and is bound and fixed; thus, the through steel bar segments 6 on the two steel plates 3 are fixedly connected with the two longitudinal steel bars 4 respectively, the two adjacent through steel bar segments 6 which are respectively positioned on the two steel plates 3 are staggered at one end of the inner side of the corresponding steel plate 3, so that the through steel bar segments 6 and the longitudinal steel bars 4 form a steel bar net structure between the two steel plates 3, and the through steel bar segments 6 can be bound and fixed with the two longitudinal steel bars 4 respectively during implementation, so that the integration of the through steel bar segments 6 and the longitudinal steel bars 4 is further improved, and the connection strength of the PBL shear key and the bridge concrete structure is improved.
Referring to fig. 2 to 5, the plurality of transverse separators 7 are uniformly spaced along the length direction of the steel plate 3, the plurality of through holes 5 are uniformly spaced along the length direction of the steel plate 3, the through holes 5 on the two steel plates 3 are opposite to each other in the transverse direction, and the two opposite through holes 5 are a group; in this way, the PBL shear key is not different from the common PBL shear key in the arrangement of the through reinforcing steel bars, so that the uniformity of the PBL shear key in the longitudinal direction is improved; in addition, at least two through holes 5 are arranged between two adjacent transverse partition plates 7 so as to complete the perforation installation operation of the through steel bar section 6 with the limiting part 9.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the present invention, and all such modifications and equivalents are included in the scope of the claims.
Claims (6)
1. The utility model provides a PBL shear force key based on two trompil steel sheets which characterized in that: the corrugated steel web plate comprises a corrugated steel web plate, wherein one side of the corrugated steel web plate in the width direction is fixedly connected with a lower flange plate, one surface of the lower flange plate, which is far away from the corrugated steel web plate, faces downwards and is vertically and fixedly connected with two steel plates, and the two steel plates are arranged at intervals in parallel and extend along the length direction of the corrugated steel web plate; a longitudinal steel bar is arranged between the two steel plates along the length direction, a plurality of through holes are formed in the steel plates at intervals along the length direction of the steel plates in a penetrating mode, through steel bar sections which extend transversely are respectively arranged in all the through holes in a penetrating mode, one end of each through steel bar section is located on the outer side of the steel plate, and the other end of each through steel bar section is located on the inner side of the steel plate and fixedly overlapped with the longitudinal steel bar.
2. The PBL shear key based on double-open-pore steel plate according to claim 1, wherein: a plurality of transverse partition plates are connected between the two steel plates, the transverse partition plates are arranged at intervals along the length direction of the steel plates, supporting holes are formed in the transverse partition plates in a penetrating mode along the length direction of the steel plates, longitudinal steel bars penetrate through the supporting holes of all the transverse partition plates, and the other ends of the penetrating steel bar sections are located on the longitudinal steel bars and fixedly connected in a lap joint mode.
3. The PBL shear key based on double-open-pore steel plate according to claim 2, wherein: one end of the through steel bar section, which is positioned on the inner side of the steel plate, passes through the longitudinal steel bar and bends and extends downwards to form a limiting part, and the limiting part is abutted with the longitudinal steel bar and is bound and fixed so as to realize the fixed lap joint of the through steel bar section and the longitudinal steel bar.
4. A PBL shear key based on double open-pore steel plate according to claim 3, characterized in that: the number of the supporting holes on the transverse partition plates is two, the supporting holes are arranged at intervals transversely, the supporting holes at the same position transversely on all the transverse partition plates are one group, and longitudinal steel bars are respectively penetrated in the two groups of supporting holes; one end of the through steel bar section positioned on the inner side of the steel plate passes through two longitudinal steel bars and bends to downwards extend to form a limiting part, and the limiting part is abutted with and bound and fixed with the adjacent longitudinal steel bars.
5. A PBL shear key based on double open-pore steel plate according to claim 3, characterized in that: the free end of the limiting part is lower than the lower end surface of the steel plate.
6. The PBL shear key based on double-open-pore steel plate according to claim 1, wherein: the transverse partition plates are uniformly arranged at intervals along the length direction of the steel plate, the through holes are uniformly arranged at intervals along the length direction of the steel plate, and the through holes on the two steel plates are opposite to each other in the transverse direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310463468.3A CN116427259A (en) | 2023-04-26 | 2023-04-26 | PBL shear key based on double-perforated steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310463468.3A CN116427259A (en) | 2023-04-26 | 2023-04-26 | PBL shear key based on double-perforated steel plate |
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| Publication Number | Publication Date |
|---|---|
| CN116427259A true CN116427259A (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310463468.3A Pending CN116427259A (en) | 2023-04-26 | 2023-04-26 | PBL shear key based on double-perforated steel plate |
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| Country | Link |
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| CN (1) | CN116427259A (en) |
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2023
- 2023-04-26 CN CN202310463468.3A patent/CN116427259A/en active Pending
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