Intermittent PBL connecting system with bent flanges

Abstract

The utility model discloses a discontinuous type PBL connecting system with bent flanges. The discontinuous type PBL connecting system comprises a main beam, the steel plate connecting piece is vertically fixed on the upper surface of the main beam, and the length direction of the steel plate connecting piece is parallel to the upper surface of the main beam; the top of the steel plate connecting piece is provided with a plurality of bent flanges distributed at intervals in the length direction of the steel plate connecting piece, all the bent flanges are bent towards one side of the steel plate connecting piece in the thickness direction, and the adjacent bent flanges face the different sides of the steel plate connecting piece in the thickness direction. The concrete plate is fixed on the upper surface of the main beam, and the concrete plate is provided with a cast-in-place hole corresponding to the steel plate connecting piece; the steel plate connecting piece is located in the cast-in-place hole, and the cast-in-place hole forms a hole filling material wrapping the steel plate connecting piece through cast-in-place concrete. The connection system has better shear resistance.

Description

Technical Field

[0001] The utility model relates to the field of assembled bridges, in particular to an intermittent PBL connection system with a curved flange. Background Art

[0002] With the rapid development of bridge structures in my country, steel-concrete composite bridge structures are becoming more and more widely used. Steel-concrete composite beams properly combine two different materials, give full play to the advantages of steel and concrete materials, improve the stability and material utilization rate of bridge structures, and reduce construction costs. In recent years, prefabricated steel-concrete composite beams have been widely used due to their advantages such as easy factory production, assembly construction, and high quality.

[0003] The use of appropriate shear connectors is an important factor in the rapid construction of prefabricated steel-concrete composite beam bridges. At the same time, shear connectors are also key load-bearing components that connect concrete slabs and steel beams in steel-concrete composite beams to ensure shear force transmission. Currently, welded nail connectors are widely used, but they have defects such as low bearing capacity, large nail group effect, and insufficient fatigue resistance. When used in prefabricated composite beams, they are prone to problems such as large reserved hole size and small spacing, and the assembly efficiency is not high.

[0004] Perforated plate shear connector (PBL) is a new type of shear connector developed to make up for the insufficient fatigue resistance of welded nails. It has the advantages of high bearing capacity, good fatigue resistance and good ductility. When high-performance concrete is used, its shear performance is even better and its application prospects are broad. However, most PBL shear connectors need to be arranged in the entire length of the beam, with large welding deformation and difficulty in arranging transverse reinforcement. Traditional PBL shear connectors are difficult to apply to prefabricated steel-concrete composite beams. Utility Model Content

[0005] The utility model provides an intermittent PBL connection system with a curved flange, which overcomes the shortcomings of the prior art described in the background technology.

[0006] The technical solution adopted by the utility model to solve the technical problem is: an intermittent PBL connection system with a curved flange, comprising:

[0007] Main beam;

[0008] A steel plate connector, wherein the steel plate connector is vertically fixed to the upper surface of the main beam, and the length direction of the steel plate connector is parallel to the upper surface of the main beam; a plurality of curved flanges are arranged at intervals along the length direction of the steel plate connector on the top, each curved flange is bent toward one side of the steel plate connector in the thickness direction, and adjacent curved flanges face different sides of the steel plate connector in the thickness direction;

[0009] A concrete slab, the concrete slab is fixed on the upper surface of the main beam, and the concrete slab is provided with cast-in-place holes corresponding to the steel plate connecting pieces;

[0010] The steel plate connector is located in the cast-in-place hole, and the cast-in-place hole is formed by pouring concrete on site to form a hole-filling material that wraps the steel plate connector.

[0011] Furthermore, the steel plate connector is provided with a notch in the portion between each two adjacent curved flanges, a steel bar is passed through each of the notches, the filling material covers the steel bar, and the filling material is filled into the notch to form a concrete tenon.

[0012] Furthermore, the notch is in a U-shape with the opening facing upward; the steel bar extends along the thickness direction of the steel plate connector, and both ends of the steel bar are respectively inserted into the concrete slab.

[0013] Furthermore, it also includes two compression-resistant steel plates, which are respectively fixed to the two ends of the steel plate connecting member in the length direction and respectively abut against the two opposite side walls of the cast-in-place hole; the hole-filling material covers the compression-resistant steel plates.

[0014] Furthermore, the compression-resistant steel plate is vertical, and its thickness direction is consistent with the length direction of the steel plate connecting piece, and the height of the compression-resistant steel plate is consistent with the height of the steel plate connecting piece.

[0015] Furthermore, the curved flange is in the shape of an upwardly convex arc.

[0016] Furthermore, there are multiple steel plate connectors, which are arranged side by side along the length direction of the main beam, and the concrete slab is provided with the cast-in-place holes corresponding to each of the steel plate connectors.

[0017] Furthermore, the longitudinal section of the main beam in its width direction is I-shaped.

[0018] Furthermore, the pore filling material is made of high-strength mortar or ultra-high performance concrete.

[0019] Furthermore, the curved flange and the steel plate connecting piece are integrally formed.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The curved flange of the steel plate connector increases the longitudinal shear area and enhances the out-of-plane pull-out resistance. The steel plate connector adopts a bidirectional curved flange, which can be used to resist the shear force by using its tensile strength when the shear direction is unclear or the shear force may change.

[0022] 2. The steel plate connector is equipped with a notch to facilitate the insertion of steel bars and make the concrete filling more compact, thereby improving the economic benefits and the quality of concrete pouring. The notch of the steel plate connector penetrates the steel bars, which is beneficial to improving the connection performance and shear resistance of the reinforced concrete composite structure.

[0023] 3. The end of the steel plate connector is welded with a compression steel plate and aligned with the end of the steel plate connection, which enhances the overall longitudinal shear resistance and improves the compressive stress distribution of concrete on the compression steel plate.

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the discontinuous PBL connection system with curved flanges of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial structural schematic diagram of the utility model;

[0026] Figure 2 It is a schematic diagram of the assembly structure of the utility model;

[0027] Figure 3 It is a three-dimensional diagram of the steel plate connector and the compression steel plate of the utility model;

[0028] Figure 4 It is a main diagram of the steel plate connector and the compression steel plate of the utility model;

[0029] Figure 5 It is a left view of the local structure of the utility model;

[0030] Figure 6 It is a three-dimensional diagram of the local structure of the utility model;

[0031] In the figure: 1. main beam; 2. steel plate connector; 21. bent flange; 22. notch; 3. concrete slab; 31. cast-in-place hole; 4. filling material; 5. steel bar; 6. compression steel plate. DETAILED DESCRIPTION

[0032] See also Figure 1 As shown, an intermittent PBL connection system with a curved flange includes: a main beam 1, a steel plate connector 2, a concrete slab 3, a hole filling material 4, a steel bar 5, and a compression steel plate 6.

[0033] The main beam 1 can be an I-shaped steel beam, an H-shaped steel beam or a box-shaped steel beam. In this embodiment, the main beam 1 is an I-shaped steel beam, and specifically, the longitudinal section of the main beam 1 in its width direction is an I-shaped beam.

[0034] The steel plate connector 2 is vertically fixed to the upper surface of the main beam 1. Specifically, the steel plate connector 2 is welded to the main beam 1, and the length direction of the steel plate connector 2 is parallel to the upper surface of the main beam 1. In this embodiment, the length direction of the steel plate connector 2 is consistent with the length direction of the main beam 1, and the steel plate connector 2 is symmetrically arranged along the longitudinal axis of the main beam 1.

[0035] The top of the steel plate connector 2 is provided with a plurality of bent flanges 21 spaced apart along its length direction, each bent flange 21 is bent toward one side of the steel plate connector 2 in the thickness direction, and adjacent bent flanges 21 face different sides of the steel plate connector 2 in the thickness direction.

[0036] In this embodiment, the bent flange 21 is in an upward convex arc shape. The bent flange 21 increases the contact area between the steel plate connector 2 and the filler hole 4, and enhances the out-of-plane pull-out resistance. The steel plate connector 2 is provided with a bidirectionally bent bent flange 21, which is suitable for resisting the shear force by using its tensile strength when the shear force direction is unclear or the shear force may change. The bent flange 21 is integrally formed with the steel plate connector 2, which can avoid problems such as excessive stress concentration caused by an excessively long weld.

[0037] The concrete slab 3 is fixed on the upper surface of the main beam 1 , and the concrete slab 3 is provided with cast-in-place holes 31 corresponding to the steel plate connecting piece 2 .

[0038] The steel plate connector 2 is located in the cast-in-place hole 31, and the cast-in-place hole 31 is formed by pouring concrete on site to form a hole-filling material 4 that wraps the steel plate connector 2. In this embodiment, the hole-filling material 4 is made of high-strength mortar or ultra-high performance concrete.

[0039] See also Figures 1 to 6 As shown, the steel plate connector 2 is provided with a slot 22 between each two adjacent curved flanges 21, and a steel bar 5 is passed through each slot 22. The steel bar 5 is covered with a hole-filling material 4, and the hole-filling material 4 is filled into the slot 22 to form a concrete tenon.

[0040] The notch 22 is in a U-shape with the opening facing upward, which is convenient for passing through the steel bar 5 and makes the filling material 4 more dense, thereby improving the economic benefits and the pouring quality of the concrete. The steel bar 5 extends along the thickness direction of the steel plate connector 2, and the two ends of the steel bar 5 are respectively inserted into the concrete slab 3, which is beneficial to improving the connection performance and shear resistance of the reinforced concrete composite structure. The size of the U-shaped notch 22 is slightly larger than the diameter of the steel bar 5, leaving a margin for error, facilitating the construction, improving time efficiency, and saving time costs.

[0041] The compression steel plates 6 are respectively fixed to the two ends of the steel plate connector 2 in the length direction, and are respectively in contact with the two opposite side walls of the cast-in-place hole 31 , and the hole-filling material 4 covers the compression steel plates 6 .

[0042] like Figure 5As shown, the compression steel plate 6 is vertical, and its thickness direction is consistent with the length direction of the steel plate connector 2, the height of the compression steel plate 6 is consistent with the height of the steel plate connector 2, and the width of the compression steel plate 6 is consistent with the width of the steel plate connector 2. In this way, the contact area between the whole and the filling hole 4 can be increased, which not only improves the compressive stress distribution of the filling material 4 on the compression steel plate 6, but also enhances the overall shear resistance.

[0043] There are multiple steel plate connectors 2 , which can be arranged side by side or in parallel at intervals. The concrete slab 3 is provided with cast-in-place holes 31 corresponding to each steel plate connector 2 .

[0044] like Figure 2 As shown, a plurality of steel plate connectors 2 are arranged side by side along the length direction of the main beam 1, a plurality of cast-in-place holes 31 are arranged corresponding to each steel plate connector 2, and the cast-in-place holes 31 are in the shape of long strips.

[0045] During the implementation process, the steel plate connector 2 and the concrete slab 3 are prefabricated first, and a whole straight steel plate is subjected to non-welding processes such as cutting and folding to form a steel plate connector 2 with a curved flange 21 and a groove 22, and the compression steel plate 6 is welded to the two ends of the steel plate connector 2 in the length direction; the concrete slab 3 with cast-in-place holes 31 and multiple steel bars 5 passing through is prefabricated.

[0046] During on-site assembly, the prefabricated steel plate connector 2 and the compression steel plate 6 are first welded together on the upper surface of the I-shaped steel beam, and then the prefabricated concrete slab 3 with cast-in-place holes 31 and through-steel bars 5 is arranged on the upper surface of the I-shaped steel beam corresponding to the steel plate connector 2. Specifically, a plurality of steel bars 5 enter the slot 22 from the opening of the U-shaped slot 22 of the steel plate connector 2, and then the ultra-high performance concrete is poured into the cast-in-place hole 31. The ultra-high performance concrete is wrapped around the inside of the steel plate connector 2 and the periphery of the through-steel bars 5 and filled into the gap to complete the concrete pouring. Finally, another group of steel plate connectors 2 and compression steel plates 6, not limited to another group, is welded to the upper surface of the I-shaped steel beam, and the above steps are repeated to form a steel-concrete composite beam with better shear resistance.

[0047] Regarding the structure and working principle of the intermittent PBL connection system with curved flanges, please refer to the previous description thereof, which will not be repeated here.

[0048] The utility model provides an intermittent PBL connection system with a curved flange, and the uninvolved parts are the same as the prior art or can be implemented by using the prior art.

[0049] The above embodiments are only used to further illustrate an intermittent PBL connection system with a curved flange of the utility model, but the utility model is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model fall within the protection scope of the technical solution of the utility model.

Claims

1. An intermittent PBL connection system with curved flanges, characterized in that: include: Main beam; A steel plate connector, wherein the steel plate connector is vertically fixed to the upper surface of the main beam, and the length direction of the steel plate connector is parallel to the upper surface of the main beam; a plurality of curved flanges are arranged at intervals along the length direction of the steel plate connector on the top, each curved flange is bent toward one side of the steel plate connector in the thickness direction, and adjacent curved flanges face different sides of the steel plate connector in the thickness direction; A concrete slab, the concrete slab is fixed on the upper surface of the main beam, and the concrete slab is provided with cast-in-place holes corresponding to the steel plate connecting pieces; The steel plate connector is located in the cast-in-place hole, and the cast-in-place hole is formed by pouring concrete on site to form a hole-filling material that wraps the steel plate connector.

2. The intermittent PBL connection system with curved flanges according to claim 1, characterized in that: The steel plate connector is provided with a notch in the portion between each two adjacent curved flanges, and a steel bar is passed through each of the notches. The filling material covers the steel bar, and the filling material is filled into the notch to form a concrete tenon.

3. The intermittent PBL connection system with curved flanges according to claim 2, characterized in that: The notch is in a U-shape with the opening facing upward; the steel bar extends along the thickness direction of the steel plate connector, and both ends of the steel bar are respectively inserted into the concrete slab.

4. The intermittent PBL connection system with curved flanges according to claim 1, characterized in that: It also includes two compression-resistant steel plates, which are respectively fixed to the two ends of the steel plate connecting member in the length direction and respectively abut against the two opposite side walls of the cast-in-place hole; the hole-filling material covers the compression-resistant steel plates.

5. The intermittent PBL connection system with curved flanges according to claim 4, characterized in that: The compression-resistant steel plate is vertical, and its thickness direction is consistent with the length direction of the steel plate connecting piece, and the height of the compression-resistant steel plate is consistent with the height of the steel plate connecting piece.

6. The intermittent PBL connection system with curved flanges according to claim 1, characterized in that: The curved flange is in an upwardly convex arc shape.

7. The intermittent PBL connection system with curved flanges according to claim 1, characterized in that: There are multiple steel plate connectors, which are arranged side by side along the length direction of the main beam, and the concrete slab is spaced apart to form the cast-in-place holes corresponding to each of the steel plate connectors.

8. The intermittent PBL connection system with curved flanges according to claim 1, characterized in that: The longitudinal section of the main beam in the width direction thereof is in an I-shape.

9. The intermittent PBL connection system with curved flanges according to claim 1, characterized in that: The material of the pore filling material is high-strength mortar or ultra-high performance concrete.

10. The intermittent PBL connection system with curved flanges according to claim 1, characterized in that: The bent flange is integrally formed with the steel plate connector.

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