Joint of beam-end shear reinforcement of prefabricated superposed beam

Abstract

The utility model discloses a node of a prefabricated superposed beam end shear reinforcement, which relates to the technical field of constructional engineering, and comprises a superposed beam main body, two L-shaped first reinforcing ribs which are arranged upwards are arranged at the left end and the right end of the superposed beam main body, and two L-shaped fourth reinforcing ribs which are arranged upwards are arranged above the first reinforcing ribs. A plurality of L-shaped second reinforcing ribs arranged downwards are arranged below the first reinforcing ribs, a plurality of L-shaped third reinforcing ribs arranged downwards are arranged below the second reinforcing ribs, and a plurality of steel rings are welded to the surfaces of the first reinforcing ribs and the surfaces of the second reinforcing ribs. A plurality of stirrups which are arranged at equal intervals are jointly mounted outside the first reinforcing ribs and the second reinforcing ribs, and the stirrups are located between the two steel rings. By arranging a series of structures, the requirement for experience during stirrup welding is reduced, the stirrups can be welded in the joint more uniformly, and the shearing strength in the joint is distributed more uniformly.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, specifically to a joint for shear reinforcement at the beam end of a precast composite beam. Background Technology

[0002] Composite beams are an important component in prefabricated concrete structures, consisting of two parts: a precast beam and a cast-in-place concrete layer. They are connected by reinforcing bars to form an integral load-bearing system. The core feature is the combination of "precast and cast-in-place," which combines the construction efficiency of precast components with the integrity of cast-in-place structures. Shear reinforcement is needed between the precast beam and the cast-in-place concrete layer to enhance the shear resistance at the beam ends and ensure that the two work together. The cast-in-place concrete layer is the common connection node between precast beams and concrete columns.

[0003] Existing composite beam shear reinforcement typically involves densifying the spacing of stirrups at key locations at the beam ends. This stirrups confine the concrete, thereby improving shear resistance. Alternatively, U-shaped or L-shaped bars can be tied to the main reinforcement to form a shear skeleton to enhance shear resistance. However, traditional stirrup densification relies heavily on the experience of construction workers, and omissions or uneven spacing can easily occur during the construction of the densified area. The lack of refined design can lead to uneven shear resistance in different areas of the beam ends. Utility Model Content

[0004] The purpose of this utility model is to provide a joint for shear reinforcement at the beam end of a precast composite beam, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a node for shear reinforcement at the beam end of a precast composite beam, comprising a composite beam body, wherein two upward-facing L-shaped first reinforcing bars are installed at both ends of the composite beam body, two upward-facing L-shaped fourth reinforcing bars are installed above the first reinforcing bars, multiple downward-facing L-shaped second reinforcing bars are installed below the first reinforcing bars, and multiple downward-facing L-shaped third reinforcing bars are installed below the second reinforcing bars, multiple steel rings are welded to the surfaces of the first and second reinforcing bars, and multiple equidistant stirrups are installed on the outside of the first and second reinforcing bars, the stirrups being located between two steel rings.

[0006] Preferably, multiple reinforcing steel plates are installed at both ends of the composite beam body and at positions between the first and second reinforcing ribs, with grooves formed between the multiple reinforcing steel plates.

[0007] Preferably, two side grooves are symmetrically opened on both the front and rear sides of the composite beam body. Composite steel bars are installed inside the side grooves. One end of the composite steel bar passes through the groove and extends from the inside of the other side groove into the interior of the composite beam body.

[0008] Preferably, a plurality of transverse reinforcing bars are installed on the outside of the plurality of reinforcing steel plates and at a position between the first reinforcing bar and the second reinforcing bar, and both ends of the transverse reinforcing bars extend into the interior of the composite beam body.

[0009] Preferably, U-shaped longitudinal reinforcing bars are welded to the outside of both first reinforcing bars and both fourth reinforcing bars.

[0010] Preferably, the spacing between the two first reinforcing bars is the same as the spacing between the two fourth reinforcing bars, the spacing between the plurality of second reinforcing bars is the same as the spacing between the plurality of third reinforcing bars, and the spacing between the plurality of second reinforcing bars is less than the spacing between the first reinforcing bars.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The shear reinforcement joint at the beam ends of this precast composite beam utilizes multiple L-shaped first, second, third, and fourth reinforcing bars at both ends of the composite beam. During concrete pouring, the concrete completely covers all the reinforcing bars. The L-shaped reinforcing bars increase the cross-section, thereby enhancing the shear strength of the joint between the composite beam and the concrete column. By welding multiple equidistant steel rings onto the surfaces of the first and second reinforcing bars, on-site reinforcement workers can directly rely on the multiple steel rings of the precast composite beam to weld any additional stirrups to the outside of the first and second reinforcing bars, thus strengthening the shear strength of the joint between the composite beam and the concrete column. This not only reduces the need for experience when welding stirrups but also allows for more uniform welding of stirrups inside the joint, resulting in a more even distribution of shear strength within the joint. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the stirrup structure of this utility model;

[0015] Figure 3 This is a cross-sectional view of the overall front structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the groove structure of this utility model.

[0017] In the diagram: 1. Composite beam main body; 2. Side groove; 3. Reinforcing steel plate; 4. First reinforcing bar; 5. Transverse reinforcing bar; 6. Groove; 7. Composite reinforcing bar; 8. Steel ring; 9. Stirrup; 10. Second reinforcing bar; 11. Third reinforcing bar; 12. Fourth reinforcing bar; 13. Longitudinal reinforcing bar. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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 this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] like Figures 1 to 3As shown, the precast composite beam end shear reinforcement node in this embodiment includes a composite beam body 1. Two upward-facing L-shaped first reinforcing bars 4 are installed at both ends of the composite beam body 1. Above the first reinforcing bars 4 are two upward-facing L-shaped fourth reinforcing bars 12. The first reinforcing bars 4 and the fourth reinforcing bars 12 are of the same size but thicker. Their upward orientation enhances the cross-section of the internal reinforcement of the connection node, thereby increasing the shear resistance of the connection node after concrete pouring. Below the first reinforcing bars 4 are multiple downward-facing... The second reinforcing bar 10 is L-shaped, and below it are multiple downward-facing L-shaped third reinforcing bars 11. The second and third reinforcing bars 10 and 11 are of the same size, and their number and density are greater than the first reinforcing bar 4. Since the second and third reinforcing bars 10 and 11 are located in the lower part of the composite beam body 1 after installation, they will bear more force than the upper part. Therefore, the denser arrangement of the second and third reinforcing bars 10 and 11 can better withstand the stress. The design effectively provides shear resistance. The first reinforcing bar 4 and the fourth reinforcing bar 12 are upward-facing L-shaped bars, while the second reinforcing bar 10 and the third reinforcing bar 11 are downward-facing L-shaped bars. This opposite orientation maximizes the cross-sectional length of the reinforcing bars within the connection node, thereby increasing shear resistance. Multiple steel rings 8 are welded to the surfaces of both the first reinforcing bar 4 and the second reinforcing bar 10. Multiple equidistant stirrups 9 are installed on the exterior of both the first reinforcing bar 4 and the second reinforcing bar 10, positioned between the two steel rings 8. By welding multiple equidistant steel rings 8 to the surfaces of the first reinforcing bar 4 and the second reinforcing bar 10, on-site reinforcement workers can directly rely on the multiple steel rings 8 of the precast composite beam to weld the additional stirrups 9 to the exterior of the first reinforcing bar 4 and the second reinforcing bar 10, thereby enhancing the shear strength of the joint between the composite beam and the concrete column. This not only reduces the need for experience when welding the stirrups 9 but also allows for more uniform welding of the stirrups 9 within the joint, resulting in a more even distribution of shear strength within the joint.

[0021] Specifically, multiple reinforcing steel plates 3 are installed at both ends of the composite beam body 1 and between the first reinforcing bar 4 and the second reinforcing bar 10. Grooves 6 are formed between the multiple reinforcing steel plates 3. Two side grooves 2 are symmetrically opened on the front and rear sides of the composite beam body 1. Composite reinforcing bars 7 are installed inside the side grooves 2. One end of the composite reinforcing bars 7 passes through the groove 6 and extends from the inside of the other side groove 2 into the interior of the composite beam body 1. The multiple reinforcing steel plates 3 can enhance the lateral superposition strength inside the connection node. The composite reinforcing bars 7 are installed between two adjacent reinforcing steel plates 3 to increase the shear resistance of the connection node.

[0022] Furthermore, multiple transverse reinforcing bars 5 are installed on the outside of multiple reinforcing steel plates 3 and between the first reinforcing bar 4 and the second reinforcing bar 10. Both ends of the transverse reinforcing bars 5 extend into the interior of the composite beam body 1. The transverse reinforcing bars 5 extend from the interior of the composite beam body 1 to the interior of the connection node. After the concrete is poured, the shear resistance inside the connection node can be effectively increased.

[0023] Furthermore, U-shaped longitudinal reinforcing bars 13 are welded to the outside of the two first reinforcing bars 4 and the two fourth reinforcing bars 12. The longitudinal reinforcing bars 13 are located inside the composite beam body 1, increasing the strength of the composite beam body 1 inside.

[0024] Furthermore, the spacing between the two first reinforcing bars 4 is the same as the spacing between the two fourth reinforcing bars 12, and the spacing between the multiple second reinforcing bars 10 is the same as the spacing between the multiple third reinforcing bars 11. The spacing between the multiple second reinforcing bars 10 is smaller than the spacing between the first reinforcing bars 4. Since the second reinforcing bars 10 and the third reinforcing bars 11 are located in the lower part after the composite beam body 1 is installed, they will bear more force than the upper part. The smaller spacing between the second reinforcing bars 10 and the third reinforcing bars 11 makes the distribution of the second reinforcing bars 10 and the third reinforcing bars 11 more dense, thus enabling them to withstand greater force.

[0025] The method of use in this embodiment is as follows: By setting multiple L-shaped first reinforcing bars 4, second reinforcing bars 10, third reinforcing bars 11 and fourth reinforcing bars 12 at both ends of the composite beam body 1, the concrete will completely cover all the reinforcing bars when pouring concrete. The L-shaped reinforcing bars can increase the cross-section, thereby improving the shear strength of the joint between the composite beam and the concrete column. By welding multiple equidistant steel rings 8 to the surface of the first reinforcing bars 4 and the second reinforcing bars 10, the workers on site can directly rely on the multiple steel rings 8 of the precast composite beam to weld the additional stirrups 9 to the outside of the first reinforcing bars 4 and the second reinforcing bars 10, thereby enhancing the shear strength of the joint between the composite beam and the concrete column. This not only reduces the need for experience when welding the stirrups 9, but also allows the stirrups 9 to be welded more evenly inside the joint, making the shear strength distribution inside the joint more uniform.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A joint for shear reinforcement at the beam ends of a precast composite beam, comprising the composite beam body (1), characterized in that: The composite beam body (1) has two upward-facing L-shaped first reinforcing bars (4) installed at both ends. Above the first reinforcing bars (4) are two upward-facing L-shaped fourth reinforcing bars (12). Below the first reinforcing bars (4) are multiple downward-facing L-shaped second reinforcing bars (10). Below the second reinforcing bars (10) are multiple downward-facing L-shaped third reinforcing bars (11). Multiple steel rings (8) are welded to the surfaces of the first reinforcing bars (4) and the second reinforcing bars (10). Multiple equidistant stirrups (9) are installed on the outside of the first reinforcing bars (4) and the second reinforcing bars (10). Each stirrup (9) is located between two steel rings (8).

2. The joint for shear reinforcement at the beam ends of the precast composite beam according to claim 1, characterized in that: Multiple reinforcing steel plates (3) are installed at both ends of the composite beam body (1) and between the first reinforcing rib (4) and the second reinforcing rib (10), and grooves (6) are formed between the multiple reinforcing steel plates (3).

3. The joint for shear reinforcement at the beam ends of the precast composite beam according to claim 2, characterized in that: The composite beam body (1) has two symmetrical side grooves (2) on both the front and rear sides. The side grooves (2) are equipped with composite steel bars (7). One end of the composite steel bars (7) passes through the groove (6) and extends from the inside of the other side groove (2) into the interior of the composite beam body (1).

4. The joint for shear reinforcement at the beam ends of the precast composite beam according to claim 3, characterized in that: Multiple transverse reinforcing bars (5) are installed outside the multiple reinforcing steel plates (3) and between the first reinforcing bar (4) and the second reinforcing bar (10), with both ends of the transverse reinforcing bars (5) extending into the interior of the composite beam body (1).

5. The joint for shear reinforcement at the beam ends of the precast composite beam according to claim 1, characterized in that: The two first reinforcing bars (4) and the two fourth reinforcing bars (12) are all welded with U-shaped longitudinal reinforcing bars (13).

6. The joint for shear reinforcement at the beam ends of the precast composite beam according to claim 1, characterized in that: The spacing between the two first reinforcing bars (4) in the same horizontal direction is the same as the spacing between the two fourth reinforcing bars (12), the spacing between the multiple second reinforcing bars (10) is the same as the spacing between the multiple third reinforcing bars (11), and the spacing between the multiple second reinforcing bars (10) is less than the spacing between the first reinforcing bars (4).

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