PBL shear key based on double-hole steel plate

Abstract

The application discloses a PBL shear key based on double-hole steel plates, which is improved on the basis of the PBL shear key of the ordinary double-hole steel plate, wherein the through steel bars are improved, two one-end-bent through steel bar sections are used to replace the ordinary fold line-shaped through steel bars which are both bent and extended at two ends, and all the through steel bar sections are connected into a whole through the setting of longitudinal steel bars, the longitudinal steel bars are beneficial to improving the structural strength, longitudinal anti-pulling performance and shearing performance of the PBL shear key; the two through steel bar sections are used to replace the ordinary through steel bars, so that the sectional construction of the through steel bars can be realized, that is, the two through steel bar sections are respectively threaded through the through holes on the corresponding side of the steel plate and are fixedly overlapped with the longitudinal steel bars, and each through steel bar section only needs to pass through one through hole, so that the through steel bar is less blocked and limited when the through hole is threaded, the complexity of passing through two through holes is avoided, the threading is simplified, the construction difficulty is reduced, the construction efficiency is improved, and the construction period is saved.

Description

Technical Field

[0001] This invention belongs to the technical field of steel-concrete composite beam connectors, specifically relating to a PBL shear key based on a double-hole steel plate. Background Technology

[0002] With the widespread application of steel-concrete composite structures in bridge engineering, corrugated steel web composite bridges have begun to appear in large numbers. Corrugated steel webs replace the original concrete webs, which not only reduces the self-weight of the bridge superstructure, but also makes full use of the shear resistance of steel materials and improves the prestressing efficiency. In corrugated steel web composite box girder bridges, PBL shear keys are used to replace traditional connection keys such as steel connection keys and welded stud connection keys in concrete structure bridges.

[0003] PBL shear keys mainly consist of perforated steel plates and continuous reinforcing bars. The perforated steel plates are welded to the upper or lower flange plates that are welded to the corrugated steel web. The continuous reinforcing bars are placed inside the perforations in the perforated steel plates and bend at both ends. To improve shear resistance, corrugated steel web composite box girder bridges currently often use PBL shear keys with double perforated steel plates (two perforated steel plates), such as Twin-PBL shear keys, PBH shear keys, and U-PBL shear keys. Figure 1 As shown, during the construction of PBL shear keys using ordinary double-perforated steel plates, the through reinforcing bars 11 are mostly zigzag-shaped, especially the through reinforcing bars on the perforated steel plate 10 connected to the lower flange plate 2, which have a large bending range. Due to the obstruction and restriction of the bent part of the through reinforcing bars, it is difficult for the through reinforcing bars to pass continuously through the openings on the two perforated steel plates. This not only leads to slow construction speed but also makes it difficult to ensure construction quality.

[0004] Therefore, it is necessary to design a PBL shear key that uses double-perforated steel plates and is easy to construct, so as to improve construction efficiency while ensuring shear resistance. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a PBL shear key based on a double-hole steel plate, which solves the technical problem that it is difficult to pass through the reinforcing bar in the current PBL shear key using double-hole steel plates, and achieves the effect of reducing construction difficulty.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A PBL shear key based on a double-perforated steel plate includes a corrugated steel web. A lower flange plate is fixedly connected to one side of the corrugated steel web in the width direction. Two steel plates are fixedly connected to the lower flange plate with the side away from the corrugated steel web facing downwards. The two steel plates are arranged in parallel and spaced apart, extending along the length direction of the corrugated steel web. A longitudinal steel bar is provided between the two steel plates along the length direction. Multiple through holes are provided through the steel plates at intervals along the length direction of the steel plates. A transversely extending through steel bar segment is inserted into each through hole. One end of the through steel bar segment is located on the outside of the steel plate, and the other end of the through steel bar segment is located on the inside of the steel plate and is fixedly lapped with the longitudinal steel bar.

[0008] Furthermore, multiple transverse partitions are connected between the two steel plates. The multiple transverse partitions are spaced apart along the length of the steel plates. Support holes are provided through the transverse partitions along the length of the steel plates. Longitudinal reinforcing bars pass through the support holes on all the transverse partitions. The other end of the through reinforcing bar segment is located on the longitudinal reinforcing bar and is fixedly lapped.

[0009] Furthermore, one end of the through-bar segment located on the inner side of the steel plate passes through the longitudinal reinforcement and bends downward to form a limiting part. The limiting part abuts against the longitudinal reinforcement and is tied and fixed to achieve a fixed lap joint between the through-bar segment and the longitudinal reinforcement.

[0010] Furthermore, there are two support holes on the transverse partition, which are spaced apart laterally. All support holes at the same position on the transverse partition are grouped together, and longitudinal steel bars are inserted into the two groups of support holes respectively. The end of the through steel bar section located on the inner side of the steel plate passes through two longitudinal steel bars and bends downward to form a limiting part. The limiting part abuts against and is tied to the adjacent longitudinal steel bar.

[0011] Furthermore, the free end of the limiting part is lower than the lower end face of the steel plate.

[0012] Furthermore, the plurality of transverse partitions are evenly spaced along the length of the steel plate, and the plurality of through holes are evenly spaced along the length of the steel plate, with the through holes on the two steel plates facing each other in the transverse direction.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The PBL shear key based on double-hole steel plate described in this invention improves upon the ordinary PBL shear key using double-hole steel plate by replacing the ordinary through-bar with two through-bar segments. This allows for segmented construction of the through-bar, whereby the two through-bar segments are passed through the holes on the corresponding sides of the steel plate and fixedly overlapped with the longitudinal reinforcement. Each through-bar segment only needs to pass through one hole, minimizing obstruction and restriction from the bending portion of the through-bar during perforation. This avoids the complexity of passing through two holes, simplifies the perforation process, reduces construction difficulty, improves construction efficiency, and saves construction time.

[0015] 2. In the PBL shear key based on double-hole steel plate described in this invention, two through steel bar segments with one end bent are used instead of ordinary zigzag through steel bars with both ends bent and extended. By setting longitudinal steel bars, all through steel bar segments are connected into one piece, which is beneficial to improving the structural strength and shear resistance of the PBL shear key. It also avoids the instability caused by the through steel bar segments being supported by only one hole during construction, which would increase the construction difficulty. In addition, the longitudinal steel bars are beneficial to improving the longitudinal pull-out resistance of the PBL shear key.

[0016] 3. In the PBL shear key based on double-hole steel plate described in this invention, multiple transverse partitions are connected between two steel plates. During construction, the longitudinal steel bars are first passed through the support holes on all the transverse partitions. The longitudinal steel bars are supported by multiple transverse partitions, eliminating the need for manual labor or other tools to maintain the position stability of the longitudinal steel bars. Then, the through steel bar segments are passed through the corresponding holes in sequence, and one end located on the inner side of the steel plate is stacked on the longitudinal steel bars. The two are then fixedly connected, which helps to reduce the difficulty of construction.

[0017] 4. In the PBL shear key based on double-perforated steel plates described in this invention, the transverse partition is equivalent to a reinforcing bar placed between the two steel plates, which helps to improve the overall structural strength of the PBL shear key. Furthermore, by restricting the transverse position of the longitudinal reinforcing bars through the transverse partition, the transverse partition also restricts the transverse movement of the through reinforcing bar segments, making the connection between the components of the PBL shear key tighter and the integrity better. This results in better stability of the PBL shear key both during and after construction. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the PBL shear key used in conjunction with ordinary double-hole steel plates as described in the embodiment;

[0019] Figure 2 A three-dimensional schematic diagram of a PBL shear key based on a double-perforated steel plate, as an example;

[0020] Figure 3 The right view of a PBL shear key based on a double-perforated steel plate is shown in the embodiment.

[0021] Figure 4 for Figure 3 A three-dimensional schematic diagram of the AA section in the front view direction;

[0022] Figure 5 for Figure 3 A three-dimensional schematic diagram of the AA section from an upward viewing angle;

[0023] Among them, the corrugated steel web 1, the lower flange plate 2, the steel plate 3, the longitudinal steel bar 4, the through hole 5, the through steel bar segment 6, the transverse partition 7, the support hole 8, the limiting part 9, the perforated steel plate 10, and the through steel bar 11. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example:

[0027] Please see Figures 2 to 5 A PBL shear key based on a double-hole steel plate includes a corrugated steel web 1. A lower flange plate 2 is fixedly connected to one side of the corrugated steel web 1 in the width direction. Two steel plates 3 are fixedly connected to the lower flange plate 2 with the side away from the corrugated steel web 1 facing downwards. The two steel plates 3 are arranged in parallel and spaced apart, extending along the length direction of the corrugated steel web 1. A longitudinal steel bar 4 is provided between the two steel plates 3 along the length direction. Multiple through holes 5 are provided through the steel plates 3 at intervals along the length direction of the steel plates 3. A transversely extending through steel bar segment 6 is inserted into each of the through holes 5. One end of the through steel bar segment 6 is located on the outside of the steel plate 3, and the other end of the through steel bar segment 6 is located on the inside of the steel plate 3 and is fixedly lapped with the longitudinal steel bar 4. In implementation, the through steel bar segment 6 and the longitudinal steel bar 4 can be fixedly lapped by means of steel wire binding or welding.

[0028] This invention discloses a PBL shear key based on a double-hole steel plate. Building upon the conventional PBL shear key using a double-hole steel plate, the through-bar reinforcement is improved. Two through-bar segments 6, each bent at one end, replace the conventional zigzag through-bars with bent ends. Longitudinal reinforcement 4 connects all through-bar segments 6 into a single unit, preventing instability caused by a single through-hole 5 during construction and reducing construction difficulty. Furthermore, the longitudinal reinforcement 4 improves the longitudinal pull-out resistance of the PBL shear key, and connecting all through-bar segments 6 into a single unit enhances its structural strength and shear resistance. Using two through-bar segments 6 instead of conventional through-bars allows for… The current segmented construction of the through-bar reinforcement involves passing two through-bar segments 6 through the holes 5 on the corresponding steel plates 3 and fixing them to the longitudinal reinforcement 4. Each through-bar segment 6 only needs to pass through one hole 5. The obstruction and restriction caused by the bending part of the through-bar during the drilling process are small, avoiding the complexity of passing through two holes 5, simplifying the drilling process, reducing construction difficulty, improving construction efficiency, and saving construction time. Furthermore, the installation of through-bars on the two steel plates 3 can be carried out simultaneously by two construction workers, which can further improve construction efficiency. This invention can effectively solve the problem of the difficulty in drilling through-bars in the current PBL shear key with double-hole steel plates, achieving the effect of reducing construction difficulty and improving construction quality.

[0029] Please see Figures 2 to 5To further reduce construction difficulty, multiple transverse partitions 7 are connected between the two steel plates 3. These transverse partitions 7 are spaced apart along the length of the steel plates 3, and each partition 7 has a through-hole 8 along the length of the steel plate 3. Longitudinal reinforcing bars 4 pass through all the through-holes 8 in the transverse partitions 7. The other end of the through-bar segment 6 is located on the longitudinal reinforcing bar 4 and is fixedly lapped. Thus, during construction, the longitudinal reinforcing bars 4 are first passed through the through-holes 8 in all the transverse partitions 7. The longitudinal reinforcing bars 4 are supported by the multiple transverse partitions 7, eliminating the need for manual labor or other tools to maintain their position. Then, the through-bar segment 6 is passed through the corresponding through hole 5 in sequence, and the end located inside the steel plate 3 is stacked on the longitudinal bar 4. The two are then fixedly connected. In addition, the transverse partition 7 is equivalent to a reinforcing bar set between the two steel plates 3, which helps to improve the overall structural strength of the PBL shear key. While restricting the transverse position of the longitudinal bar 4 by the transverse partition 7, it also restricts the transverse movement of the through-bar segment 6, making the connection of each component of the PBL shear key tighter and the integrity better. This gives the PBL shear key better stability both during the construction stage and after construction.

[0030] Please see Figures 2 to 5 One end of the through-bar segment 6 located inside the steel plate 3 passes through the longitudinal reinforcing bar 4 and bends downward to form a limiting part 9. The limiting part 9 abuts against and is tied to the longitudinal reinforcing bar 4 to achieve a fixed lap joint between the through-bar segment 6 and the longitudinal reinforcing bar 4. The zigzag-shaped through-bar segments 6 are all prefabricated. The perforation installation operation of the through-bar segment 6 with the limiting part 9 is briefly described as follows: First, adjust the posture of the through-bar segment 6 to make the limiting part 9 as parallel as possible to the axis of the corresponding through hole 5 so that the limiting part 9 can pass through the corresponding through hole 5. Then, adjust the posture of the through-bar segment 6 again so that the straight section of the through-bar 6 (i.e., Figure 4 The section connected to the limiting part 9 is parallel to the axis of the corresponding through hole 5. Then, the through steel bar 6 is rotated about the straight section as the axis, so that the limiting part 9 is higher than the longitudinal steel bar 4. Then, the through steel bar 6 is pushed to move inward to the steel plate 3 until the limiting part 9 passes the longitudinal steel bar 4. Finally, the through steel bar 6 is rotated about the straight section as the axis again, so that the free end of the limiting part 9 faces downward. Then, the limiting part 9 is adjusted to abut against the longitudinal steel bar 4 and tied and fixed.

[0031] In this way, the through-bar segment 6 abuts against the longitudinal bar 4 through the limiting part 9, which facilitates the installation and positioning of the through-bar segment 6 during construction. It also prevents the end of the through-bar segment 6 located on the inner side of the steel plate 3 from detaching from the longitudinal bar 4 before the two are fixed or when the two are not fixed securely, which would cause the through-bar segment 6 to fall or lose its lateral load-bearing capacity. In addition, after pouring, the limiting part 9 is also embedded in the concrete like the bent part of an ordinary through-bar, providing more connection points for the connection between the PBL shear key and the concrete, increasing the connection strength between the PBL shear key and the bridge concrete structure. To further improve the connection strength, in this embodiment, the free end of the limiting part 9 extends downward and is lower than the lower end face of the steel plate 3.

[0032] Please see Figures 2 to 5 In this embodiment, there are two support holes 8 on the transverse partition 7, which are arranged laterally at intervals. All support holes 8 at the same transverse position on the transverse partition 7 are grouped together. Longitudinal reinforcing bars 4 are respectively inserted into the two groups of support holes 8. The end of the through reinforcing bar segment 6 located on the inner side of the steel plate 3 passes through two longitudinal reinforcing bars 4 and bends downward to form a limiting part 9. The limiting part 9 abuts against and is tied to the adjacent longitudinal reinforcing bars 4. In this way, the through reinforcing bar segments 6 on the two steel plates 3 are fixedly connected to the two longitudinal reinforcing bars 4 respectively. The ends of the two adjacent through reinforcing bar segments 6 located on the inner side of the corresponding steel plates 3 are staggered, so that the through reinforcing bar segments 6 and the longitudinal reinforcing bars 4 form a reinforcing mesh structure between the two steel plates 3. In practice, the through reinforcing bar segments 6 can also be tied to the two longitudinal reinforcing bars 4 respectively to further improve the integrity of the through reinforcing bar segments 6 and the longitudinal reinforcing bars 4 and improve the connection strength between the PBL shear key and the bridge concrete structure.

[0033] Please see Figures 2 to 5 The plurality of transverse partitions 7 are evenly spaced along the length of the steel plate 3, and the plurality of through holes 5 are evenly spaced along the length of the steel plate 3. The through holes 5 on two steel plates 3 are aligned one to one in the transverse direction, and two aligned through holes 5 form a group. In this way, the PBL shear key is no different from the ordinary PBL shear key in terms of the arrangement of the through reinforcing bars, thereby improving the uniformity of the longitudinal force on the PBL shear key. In addition, there are at least two through holes 5 between two adjacent transverse partitions 7, so as to complete the through-hole installation operation of the through reinforcing bar segment 6 with the limiting part 9.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A PBL shear key based on a double-perforated steel plate, characterized in that: The structure includes a corrugated steel web, with a lower flange plate fixedly connected to one side of the corrugated steel web in the width direction. The side of the lower flange plate away from the corrugated steel web faces downward and is vertically fixedly connected to two steel plates. The two steel plates are arranged in parallel and spaced apart, extending along the length direction of the corrugated steel web. Longitudinal reinforcement bars are provided between the two steel plates along the length direction. Multiple through holes are provided through the steel plates at intervals along the length direction of the steel plates. Transversely extending through steel bar segments are inserted into all the through holes. One end of the through steel bar segment is located on the outside of the steel plate, and the other end of the through steel bar segment is located on the inside of the steel plate and is fixedly lapped with the longitudinal reinforcement bars. One end of the through-bar segment located on the inner side of the steel plate passes through the longitudinal bar and bends downward to form a limiting part. The limiting part abuts against the longitudinal bar and is tied and fixed to achieve a fixed lap joint between the through-bar segment and the longitudinal bar.

2. The PBL shear key based on a double-perforated steel plate according to claim 1, characterized in that: Multiple transverse partitions are connected between two steel plates. The multiple transverse partitions are spaced apart along the length of the steel plates. Support holes are provided through the transverse partitions along the length of the steel plates. Longitudinal reinforcing bars pass through the support holes on all the transverse partitions. The other end of the through reinforcing bar segment is located on the longitudinal reinforcing bar and is fixedly lapped.

3. The PBL shear key based on a double-perforated steel plate according to claim 1, characterized in that: There are two support holes on the transverse partition, which are set at a transverse interval. All support holes at the same transverse position on the transverse partition are a group. Longitudinal steel bars are inserted into the two groups of support holes respectively. The end of the through steel bar section located on the inner side of the steel plate passes through two longitudinal steel bars and bends downward to form a limiting part. The limiting part abuts against the adjacent longitudinal steel bar and is tied and fixed.

4. The PBL shear key based on a double-perforated steel plate according to claim 1, characterized in that: The free end of the limiting part is lower than the lower end face of the steel plate.

5. The PBL shear key based on a double-hole steel plate according to claim 2, characterized in that: The plurality of transverse partitions are evenly spaced along the length of the steel plate, and the plurality of through holes are evenly spaced along the length of the steel plate, with the through holes on the two steel plates facing each other in the transverse direction.

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