CN209873546U - A steel-concrete connector combined with welding studs and orifice plates - Google Patents

Abstract

The utility model discloses a steel-concrete connector combined with welding studs and orifice plates, comprising a steel structure, the steel structure comprising a steel plate mother plate (1), several orifice plates (2) and several cylindrical head welding studs (5) , the orifice plate (2) and the cylindrical head welding stud (5) are vertically fixed on the top surface of the steel plate mother plate (1), and the top of the orifice plate (2) is fixed with a flange plate (3), the The orifice plate (2) is provided with an opening (6), the opening (6) is equipped with a steel bar (4) in the hole, and concrete is poured on the periphery of the steel structure. It has the following advantages: This technical scheme can improve the stress state of the steel-concrete joint, enhance the fatigue performance of the steel-concrete joint, improve the shear resistance and pull-out resistance of the joint surface, and reduce the local tensile stress of the concrete , can improve the construction efficiency of steel and concrete composite structures.

Description

A steel-concrete connector combined with welding studs and orifice plates

technical field

The utility model belongs to the technical field of bridge structures, in particular to a steel-concrete connector combined with welding studs and orifice plates.

Background technique

In steel-concrete composite structure bridges, connectors are usually used to combine steel members and concrete members into a common force-bearing whole. When the steel-concrete connector is in a state of spatial stress, especially when it is located at the joint surface of the steel beam and the concrete bridge deck, or the complex joints such as the anchorage area of the cable-stayed bridge composite cable tower, it must bear a large in-plane shear force and Transfer large out-of-plane pulling force to prevent peeling of steel plate and concrete. For this reason, the steel-concrete connectors need to have good shear resistance and pull-out resistance at the same time.

The most commonly used connectors in actual bridge engineering include cylindrical head welding studs, steel connectors and perforated plate connectors. Among them, the welding stud connector resists the in-plane shear force through the root of the welding stud, and provides the out-of-plane pull-out resistance through the cylindrical head. The section steel connector bears the in-plane shear force through the thrust force of the rib plate, and resists the out-of-plane pulling force by welding U-shaped ribs or setting flange plates. The perforated plate connector provides longitudinal shear force and out-of-plane pullout force through the steel bar in the hole and the concrete tenon, and bears the lateral shear force through the thrust force of the rib plate.

Due to their different structures and construction performance, various connectors have their applicability and limitations in different types of bridge composite structures. Among them, the in-plane shear resistance of welding stud connectors has no directionality and is suitable for the joint surface connection of most composite structures. However, welding studs require special welding machines for installation, and the construction workload is relatively large. The weld at the root of the welding studs is affected. Fatigue loads have a greater influence. The in-plane shear bearing capacity and shear stiffness of section steel connectors are large, but the performance of resisting out-of-plane pull-out loads is weak, and the local stress of concrete is relatively concentrated. Open-hole plate connectors have high in-plane shear resistance, out-of-plane pullout resistance, and good fatigue resistance, but the construction of the steel bars passing through the holes is inconvenient.

Utility model content

The utility model provides a steel-concrete connector combined with welding studs and orifice plates, which overcomes the shortcomings of the steel-concrete connector in the background technology.

The technical solution adopted by the utility model to solve its technical problems is:

A steel-concrete connector combined with welding studs and orifice plates, including a steel structure, the steel structure includes a steel plate mother plate (1), several orifice plates (2) and several cylindrical head welding studs (5), the orifice plate ( 2), the cylindrical head welding studs (5) are fixed vertically on the top surface of the steel plate mother plate (1), the top of the orifice plate (2) is fixed with a flange plate (3), the orifice plate (2) An opening (6) is arranged on the top, and a steel bar (4) in the hole is installed in the opening (6), and concrete is poured on the periphery of the steel structure.

Among one embodiment: this perforated plate (2), the cylindrical head welding stud (5) all vertical top surface of steel plate mother plate (1).

In one embodiment: the flange plate (3) is perpendicular to the orifice plate (2) and has a T-shaped structure.

In one embodiment: the plurality of orifice plates (2) are arranged side by side at intervals.

In one embodiment: the plurality of orifice plates (2) are arranged in parallel and at intervals.

In one embodiment: the plurality of orifice plates (2) are arranged in non-parallel intervals.

In one embodiment: the top surface of the orifice plate (2) is recessed with a groove penetrating through the plate thickness direction, the groove has two groove walls, and the above-mentioned opening (6) is formed in the groove.

In one embodiment: the groove has a notch (8), the width of the notch (8) and the width of the opening (6) are larger than the diameter of the steel bar (4) in the hole.

In one embodiment: the top edge of the orifice plate (2) includes several connection sections separated by grooves, and the ends of the flange plate (3) are aligned with the ends of the connection sections.

In one embodiment: the opening (6) is a round hole, a rectangular hole or a special-shaped hole.

Compared with the background technology, this technical solution has the following advantages:

This technical scheme can improve the stress state of the steel-concrete joint, enhance the fatigue performance of the steel-concrete joint, improve the shear resistance and pull-out resistance of the joint surface, reduce the local tensile stress of the concrete, and improve the steel-concrete joint. Construction efficiency of concrete composite structures.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described.

Fig. 1 is a structural schematic diagram of a steel-concrete connector combined with welding studs and orifice plates.

Fig. 2 is a side view of the steel-concrete connector combined with welding studs and orifice plates.

Reference signs: steel plate mother plate 1, hole plate 2, flange plate 3, steel bar in the hole 4, cylindrical head welding nail 5, hole 6, concrete 7, notch 8.

Detailed ways

Please refer to FIG. 1 and FIG. 2 , a steel-concrete connector combined with welding studs and orifice plates, including a steel structure.

The orifice plate 2 and the cylindrical head welding stud 5 are all vertically fixedly welded on the top surface of the steel plate mother plate 1, and the orifice plate 2 and the cylindrical head welding stud 5 are all perpendicular to the top surface of the steel plate mother plate 1. The plurality of orifice plates 2 are arranged side by side at intervals, such as the plurality of orifice plates 2 are arranged at intervals in parallel or in non-parallel intervals.

The top surface of the orifice plate 2 is recessed with several grooves arranged at intervals along the length of the plate and penetrating through the thickness direction of the plate. The grooves have two groove walls. At least one steel bar 4 in the hole is installed in the hole 6 . The groove has a notch 8 whose width, as well as the width of the opening 6, is greater than the diameter of the reinforcing bar 4 in the hole. The opening 6 is a round hole, a rectangular hole or a special-shaped hole. The plate 2 constitutes a toothed orifice plate 2 due to grooves or holes.

The top edge of the orifice plate 2 includes several connecting sections spaced apart by grooves, and a flange plate 3 is fixedly welded on each connecting section, and the ends of the flange plate 3 are aligned with the ends of the connecting sections. The plate 3 is perpendicular to the orifice plate 2 and has a T-shaped structure.

Weld the steel plate mother plate 1, several orifice plates 2, several cylindrical head welding studs 5, flange plates 3, and after installing the steel bars 4 in the holes, pour concrete 7 around the steel structure.

Among the specific embodiments: several orifice plates 2 and cylindrical head welding studs 5 are vertically welded on the steel plate mother plate 1, which not only resist the shear force in the plate surface and the drawing force outside the surface as connectors, but also improve the strength of the steel plate mother plate. 1 bending stiffness. A flange plate 3 is arranged on the top of the orifice plate 2, which can enhance the out-of-plane pullout resistance. A number of openings 6 in the shape of round holes, long holes or special-shaped holes are arranged in the surface of the orifice plate 2, and pouring concrete 7 in the holes can provide the effect of shear pins. At least one steel bar 4 in the hole is installed in the hole 6, which can effectively improve the strength and rigidity of the joint surface and improve the fatigue performance of the steel-concrete composite structure. The edge of opening 6 is provided with notch 8, and the width of notch 8 is greater than the diameter of reinforcing bar 4 in the hole, can facilitate the reinforcing bar 4 in the hole and directly puts in the opening 6 of multi-block orifice plate 2, improves construction efficiency. Multiple plates of the orifice plate 2 are arranged in parallel or inclined to adapt to the direction of force transmission between the steel member and the concrete member.

The connector in this specific embodiment can enhance the fatigue performance of the joint between steel and concrete, improve the shear resistance and pullout resistance of the joint surface, improve the crack resistance of concrete, and is a new connector that is economical, safe and convenient for construction. Specifically, it has the following advantages: 1. Strengthen the fatigue performance of the joint between steel and concrete. Welding stud connectors need to be welded at multiple points on the mother plate of the steel plate, and there are local welding residual deformation and residual stress, and the shear deformation is relatively large, which is easily affected by cyclic loads. The utility model combines discretely welded welding studs with continuous welded orifice plates to improve the stiffness of the steel-concrete junction, thereby enhancing the ability to resist fatigue loads. 2. Improve the shear resistance and pullout resistance of the joint surface. The existing connectors have high in-plane shear capacity, but relatively weak out-of-plane tensile capacity. The utility model resists the in-plane shear force through the root of the welding stud, the shear resistance of the steel bar in the hole and the concrete tenon, and the occlusion of the orifice plate, and the pull-out resistance of the cylindrical head of the welding stud, the shear resistance of the steel bar in the hole and the concrete tenon, and the orifice plate. The flange anchoring effect resists the out-of-plane pull-out force, which improves the shear resistance and pull-out resistance of the joint surface in all directions. 3. Improve the crack resistance of concrete. Compared with the multi-point concentrated force between the root and the concrete of each welding stud connector, the local contact pressure between the steel connector and the concrete is relatively large, and the concrete in the hole of the perforated plate connector bears a large shear force. The utility model uses the welding stud The staggered arrangement with the orifice plate avoids the local concentration of the steel member and the concrete, thereby improving the crack resistance of the concrete. 4. Economical, safe and convenient for construction. When the distance between the welding stud connector and the section steel connector is small, it will have a great influence on the layout of the stressed steel bars in the concrete. The openings of the perforated plate connectors can penetrate the steel bars in the holes, but it is difficult for the steel bars to penetrate multiple orifice plates at the same time. larger. The orifice plate of the utility model is provided with notches, and the steel bars in the holes can be directly put into the openings of a plurality of orifice plates, which greatly improves the construction efficiency of the steel bars at the junction of steel and concrete.

The above is only a preferred embodiment of the utility model, so the scope of implementation of the utility model cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the utility model and the contents of the specification should still belong to this utility model. within the scope of utility models.

Claims (10)

1. A steel-concrete connector combined with welding studs and orifice plates is characterized in that: it comprises a steel structure, and the steel structure comprises a steel plate mother plate (1), some orifice plates (2) and some cylindrical head welding studs (5 ), the orifice plate (2) and the cylindrical head welding stud (5) are vertically fixed on the top surface of the steel plate mother plate (1), and the top of the orifice plate (2) is fixed with a flange plate (3), The orifice plate (2) is provided with an opening (6), the opening (6) is equipped with a steel bar (4) in the hole, and concrete is poured on the periphery of the steel structure. 2. A steel-concrete connector combined with a welding stud and an orifice plate according to claim 1, characterized in that: the orifice plate (2) and the cylindrical head welding stud (5) are both perpendicular to the base plate of the steel plate (1). top surface. 3. The steel-concrete connector combined with welding studs and orifice plates according to claim 1, characterized in that: the flange plate (3) is perpendicular to the orifice plate (2) and has a T-shaped structure. 4. A steel-concrete connector combined with welding studs and orifice plates according to claim 1, characterized in that: the plurality of orifice plates (2) are arranged side by side at intervals. 5. The steel-concrete connector combined with welding studs and orifice plates according to claim 4, characterized in that: the plurality of orifice plates (2) are arranged in parallel and at intervals. 6. The steel-concrete connector combined with welding studs and orifice plates according to claim 4, characterized in that: the plurality of orifice plates (2) are arranged in non-parallel intervals. 7. A steel-concrete connector combining welding studs and orifice plates according to claim 1, characterized in that: the top surface of the orifice plate (2) is concavely provided with a groove penetrating along the plate thickness direction, and the groove It has two groove walls, and the groove is concavely formed with the above-mentioned opening (6). 8. A steel-concrete connector combined with welding studs and orifice plates according to claim 7, characterized in that: the groove has a notch (8), the width of the notch (8) and the opening (6) The width of all is greater than the diameter of reinforcing bar (4) in the hole. 9. A steel-concrete connector combining welding studs and orifice plates according to claim 7, characterized in that: the top edge of the orifice plate (2) includes several connecting sections separated by grooves, and the flange The end of the plate (3) is aligned with the end of the connecting section. 10. A steel-concrete connector combining welding studs and orifice plates according to any one of claims 1 to 9, characterized in that: the opening (6) is a round hole, a rectangular hole or a special-shaped hole.