A welding-free self-locking PBL shear key

Abstract

This utility model provides a weld-free self-locking PBL shear key, effectively solving the problems of difficulty in welding perforated steel plates, long construction time, and difficulty in guaranteeing weld quality in existing shear key construction, as well as the lack of self-locking alignment between the shear key and the steel flange, and the need for further improvement in pull-out resistance. The technical solution includes an I-beam steel flange with a rectangular hole. A T-shaped steel is located above the rectangular hole, and clamping members are located on both sides of the web of the T-shaped steel. Two protrusions on one side of the clamping members form an F-shaped structure, and the steel flange is locked between the two protrusions. Through holes are provided on the web of the T-shaped steel and the clamping members on both sides, and the reinforcing bars pass horizontally through the through holes through the web and the clamping members on both sides. This utility model has an ingenious structure that can be constructed through on-site assembly. It can achieve self-locking by utilizing the structure's own weight, while ensuring that the T-shaped steel is centered in the reserved rectangular hole and clamped firmly, resulting in a reliable structural connection.

Description

Technical Field

[0001] This utility model relates to the field of steel-concrete composite structure technology, and in particular to a weld-free self-locking PBL shear key. Background Technology

[0002] Currently, the most commonly used shear key in engineering practice is the perforated steel plate connector, also known as the PBL key. The PBL key is a rigid shear connector composed of a perforated steel plate, a concrete tenon, and continuous reinforcing bars. Shear force is transferred through the synergistic action of the concrete tenon and the continuous reinforcing bars within the perforated steel plate. It possesses advantages such as high shear stiffness, large bearing capacity, and good ductility. Examples include a prefabricated shear connector disclosed in patent document CN206319419U and a novel steel-concrete composite beam using PBL shear keys and its construction method disclosed in CN117867958A. However, it also has significant drawbacks in implementation: welding the perforated steel plate is difficult, construction time is long, weld quality is hard to guarantee, the shear key lacks self-locking alignment between the shear key and the steel flange, and its pull-out resistance needs further improvement. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a weld-free self-locking PBL shear key, which effectively solves the problems of difficulty in welding perforated steel plates, long construction time, difficulty in guaranteeing weld quality, lack of self-locking alignment function between shear key and steel flange, and need to further improve pull-out resistance in the construction of existing shear keys.

[0004] The technical solution includes an I-beam with a steel flange. A rectangular hole is opened on the steel flange, and a T-beam is placed at the upper end of the rectangular hole. The web of the T-beam is inserted into the rectangular hole. There are clamping members on both sides of the web of the T-beam. The lower end of the clamping member passes through the rectangular hole. There are two protruding strips on the side of the clamping member away from the web of the T-beam to form an F-shaped structure. The steel flange is stuck between the two protruding strips. The web of the T-beam and the clamping members on both sides are provided with through holes. The reinforcing bars pass horizontally through the through holes through the web and the clamping members on both sides.

[0005] Preferably, the spacing between two protrusions on the same clamping element is equal to the thickness of the steel flange of the I-beam.

[0006] Preferably, an inclined surface is provided between two protrusions on the same clamping member, with the lower end of the inclined surface tilted away from the web of the T-shaped steel.

[0007] Preferably, the left and right sides of the rectangular hole are inclined to match the bevel.

[0008] This utility model has a clever structure that can be constructed through on-site assembly. It can achieve self-locking by utilizing the structure's own weight, while ensuring that the T-shaped steel is in the center of the reserved rectangular hole and is clamped and immobile, resulting in a reliable structural connection. Attached Figure Description

[0009] Figure 1 This is a three-dimensional drawing of the present invention.

[0010] Figure 2 This is an exploded view of the present invention. Detailed Implementation

[0011] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0012] Depend on Figures 1 to 2 The present invention includes a steel flange 1 of an I-beam, a rectangular hole 2 on the steel flange 1, a T-beam 3 at the upper end of the rectangular hole 2, the web of the T-beam 3 being inserted into the rectangular hole 2, clamping members 4 on both sides of the web of the T-beam 3, the lower end of the clamping members 4 penetrating through the rectangular hole 2, and two protruding strips 5 forming an F-shaped structure on the side of the clamping member 4 away from the web of the T-beam 3, the steel flange 1 being held between the two protruding strips 5; through holes are provided on the web of the T-beam 3 and the clamping members 4 on both sides, and reinforcing bars 6 horizontally penetrate the web and the clamping members 4 on both sides through the through holes.

[0013] The spacing between the two protrusions 5 on the same clamping element 4 is equal to the thickness of the steel flange 1 of the I-beam.

[0014] An inclined surface 7 is provided between two protruding strips 5 on the same clamping member 4, and the lower end of the inclined surface 7 is inclined away from the web of the T-shaped steel 3.

[0015] The rectangular hole 2 has two inclined sides that match the inclined surface 7.

[0016] Traditional PBL shear keys require welding a perforated steel plate to the steel flange 1, which is time-consuming and labor-intensive, and prone to insufficient load-bearing capacity due to substandard weld quality, posing a safety hazard. The shear key proposed in this application uses a tenon and mortise structure to mechanically connect the perforated T-shaped steel, F-shaped clamping member 4, reinforcing bar 6, concrete tenon, and steel flange 1 together. The structure is safe and reliable, and no welding is required, completely avoiding the load-bearing capacity reduction problem caused by welding. Installation can be completed by manual splicing only, making the installation process simple, convenient, and quick.

[0017] Traditional PBL shear keys have a rectangular cross-section for the perforated steel plate, and their pull-out resistance is determined by their bond strength with the concrete and the shear resistance of the through-bar reinforcement and the concrete tenon. In contrast, the perforated steel plate in this design has a T-shaped cross-section, and its top can mechanically engage with the concrete, gripping it tightly like a hook, thus further enhancing the pull-out resistance compared to traditional PBL shear keys.

[0018] Meanwhile, under the action of the I-beam itself, and with the cooperation of the two protruding strips 5 on the clamping member 4 and the inclined surface 7 between them, the steel flange 1 of the I-beam and the T-beam 3 can be firmly installed together. At the same time, the web of the T-beam 3 is squeezed and fixed in the middle by the two clamping members 4, which not only achieves structural fixation, but also achieves the alignment of the web of the T-beam 3 with the rectangular hole 2. This achieves multiple benefits and has excellent anti-sway performance.

[0019] This utility model has a clever structure that can be constructed through on-site assembly. It can achieve self-locking by utilizing the structure's own weight, while ensuring that the T-shaped steel 3 is centered in the reserved rectangular hole 2 and clamped firmly, resulting in a reliable structural connection.

Claims

1. A weld-free, self-locking PBL shear key, characterized in that, The steel flange (1) of the I-beam is provided with a rectangular hole (2) on the steel flange (1). A T-beam (3) is provided at the upper end of the rectangular hole (2). The web of the T-beam (3) is inserted into the rectangular hole (2). There are clamping parts (4) on both sides of the web of the T-beam (3). The lower end of the clamping part (4) passes through the rectangular hole (2). There are two protruding strips (5) on the side of the clamping part (4) away from the web of the T-beam (3) to form an F-shaped structure. The steel flange (1) is stuck between the two protruding strips (5). The web of the T-beam (3) and the clamping parts (4) on both sides are provided with through holes. The reinforcing bar (6) passes horizontally through the through holes through the web and the clamping parts (4) on both sides.

2. The weld-free self-locking PBL shear key according to claim 1, characterized in that, The spacing between two protrusions (5) on the same clamping element (4) is equal to the thickness of the steel flange (1) of the I-beam.

3. The weld-free self-locking PBL shear key according to claim 1, characterized in that, An inclined surface (7) is provided between two protruding strips (5) on the same clamping member (4), with the lower end of the inclined surface (7) tilted away from the web of the T-shaped steel (3).

4. The weld-free self-locking PBL shear key according to claim 3, characterized in that, The rectangular hole (2) has two inclined sides that are compatible with the inclined surface (7).

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