Light steel-concrete combined bridge deck slab

Abstract

The utility model belongs to the field of bridge engineering, and particularly relates to a light steel-concrete combined bridge deck which comprises a steel bottom plate, a steel pipe stiffening rib, a reinforcing mesh and post-pouring concrete, the steel pipe stiffening rib is arranged above the steel bottom plate in the transverse bridge direction of the bridge deck in a full-length mode, and the steel bottom plate is connected with the steel pipe stiffening rib through a fillet weld. The reinforcing mesh is arranged above the steel pipe stiffening ribs, and after the reinforcing mesh is installed, concrete is poured on the steel bottom plate to form the combined bridge deck slab. The steel pipe is adopted to replace a traditional plate type stiffening rib, the steel pipe can stiffen the flat steel plate in the construction process, the bending rigidity and strength of the flat steel plate in the transverse bridge direction are improved, and when a steel-concrete interface of the combined bridge deck slab has a stripping trend, post-poured concrete below the steel pipe and the lower half side of the steel pipe extrude each other, so that the steel-concrete interface of the combined bridge deck slab is stripped. The effect of resisting mutual stripping between the steel bottom plate and the post-pouring concrete can be achieved, the use amount of the post-pouring concrete can be reduced due to the hollow characteristic of the steel pipes, and the weight of the combined bridge deck slab is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of bridge engineering, specifically relating to a lightweight steel-concrete composite bridge deck. Background Technology

[0002] In composite bridge structures, steel-concrete composite bridge decks are a common form. Their basic structure includes a flat steel plate, plate stiffeners, and a concrete layer. Specifically, the flat steel plate serves as the base plate, on which plate stiffeners are welded. These stiffeners have circular holes for inserting reinforcing bars to form PBL (Polymerized Bracket Liner) connectors. Finally, after pouring concrete, the flat steel plate-concrete composite bridge deck is formed. This structure not only fully utilizes the advantages of both steel and concrete but also achieves their coordinated operation through PBL connectors.

[0003] The advantages of steel-concrete composite bridge decks are significant. First, the steel plates serve as permanent formwork, reducing formwork erection work during construction and improving construction efficiency. Second, the steel plates can replace ordinary reinforcing bars in the tension zone, participating in the later-stage stress distribution of the bridge deck and further optimizing the structural stress performance. Furthermore, composite bridge decks possess high load-bearing capacity and stiffness, effectively reducing bridge deflection under load and improving the overall stability of the bridge.

[0004] However, this composite bridge deck also has some drawbacks. The main problem lies in the cumbersome process of drilling circular holes in the stiffening ribs and inserting ordinary reinforcing bars during construction. This not only increases the difficulty of construction but also prolongs the construction time. This process requires precise positioning and welding, and even slight carelessness can affect the shear resistance of the connectors, thereby impacting the safety of the entire structure. Furthermore, without drilling circular holes in the stiffening ribs, there will be a lack of effective shear connections between the steel plate and the concrete slab, making them prone to slippage and pull-out, severely affecting the overall performance of the structure.

[0005] Therefore, how to provide a lightweight steel-concrete composite bridge deck that achieves tensile and shear resistance between steel and concrete through the self-locking function of novel stiffening ribs has become a problem that needs to be considered by those skilled in the art. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model discloses a lightweight steel-concrete composite bridge deck. This utility model uses steel pipes instead of traditional plate stiffeners. During construction, the steel pipes can stiffen the flat steel plates, improving the transverse bending stiffness and strength of the flat steel plates. The hollow nature of the steel pipes can reduce the amount of post-cast concrete and reduce the weight of the composite bridge deck.

[0007] To achieve the above objectives, the present invention specifically discloses the following solution:

[0008] A lightweight steel-concrete composite bridge deck includes a steel base plate, steel pipe stiffening ribs, a steel mesh, and post-cast concrete. The steel pipe stiffening ribs are arranged along the transverse direction of the bridge deck above the steel base plate. The steel base plate and the steel pipe stiffening ribs are connected by fillet welds. The steel mesh is arranged above the steel pipe stiffening ribs. After the steel mesh is installed, the composite bridge deck is formed by post-casting concrete on top of the steel base plate.

[0009] Furthermore, the steel mesh includes transverse ordinary steel bars and longitudinal ordinary steel bars, with the lower edge of the longitudinal ordinary steel bars contacting the upper edge of the steel pipe stiffening ribs.

[0010] Furthermore, the steel pipe stiffening ribs are hollow inside.

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

[0012] This invention involves welding a steel pipe above the steel base plate of a composite bridge deck. During construction, the steel pipe can reinforce the flat steel plate, improving its transverse bending stiffness and strength. When the steel-concrete interface of the composite bridge deck tends to peel off, the post-cast concrete below the steel pipe and the lower half of the steel pipe are squeezed together, which can resist the peeling between the steel base plate and the post-cast concrete.

[0013] In this invention, the contact area between the steel pipe and the post-cast concrete is much larger than the contact area between the plate rib and the post-cast concrete. The shear slip of the steel-concrete interface can be resisted by the natural bonding between the steel pipe and the post-cast concrete, as well as the friction generated by the compression between the web of the steel pipe and the post-cast concrete below.

[0014] In this invention, steel pipes are used instead of traditional plate stiffeners. The hollow nature of the steel pipes can reduce the amount of post-cast concrete and lighten the weight of the composite bridge deck, ultimately forming a lightweight composite bridge deck that does not require shear connectors. Attached Figure Description

[0015] Figure 1 This is a longitudinal cross-sectional view of the composite bridge deck.

[0016] Figure 2 for Figure 1 AA section view of the transverse bridge.

[0017] Figure 3 for Figure 1 Cross-sectional view of the bridge from the BB direction.

[0018] In the diagram, 1—steel base plate; 2—steel pipe stiffening rib; 3—fillet weld; 4—transverse ordinary reinforcing steel; 5—longitudinal ordinary reinforcing steel; 6—post-cast concrete. Detailed Implementation

[0019] 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.

[0020] Example 1

[0021] like Figure 1-3 As shown, this embodiment discloses a lightweight steel-concrete composite bridge deck. The entire structure includes a steel base plate 1, steel pipe stiffening ribs 2, fillet welds between the steel pipes and the steel base plate 3, transverse ordinary reinforcing bars 4, longitudinal ordinary reinforcing bars 5, and post-cast concrete 6.

[0022] First, steel pipe stiffening ribs 2 are installed above the steel base plate 1 along the transverse direction of the bridge. The steel base plate 1 and the steel pipe stiffening ribs 2 are connected by fillet welds 3 between the steel pipe and the steel base plate. The steel pipe stiffening ribs 2 are installed along the entire length of the bridge deck in the transverse direction of the bridge to facilitate welding with automatic welding equipment. A steel mesh composed of ordinary steel bars 4 in the transverse direction and ordinary steel bars 5 in the longitudinal direction is installed above the steel pipe stiffening ribs 2. The lower edge of part of the ordinary steel bars 5 in the longitudinal direction contacts the upper edge of the steel pipe stiffening ribs 2. After the steel mesh is installed, a composite bridge deck is formed by post-pouring concrete 6 above the steel base plate 1.

[0023] This invention resists the normal separation tendency between the steel base plate 1 and the post-cast concrete by the mutual compression between the lower half of the steel pipe stiffening rib 2 and the post-cast concrete; at the same time, it utilizes the large bonding area between the steel pipe stiffening rib 2 and the post-cast concrete 6 to resist the shear slip between the steel and concrete through the bonding force. In particular, the normal compression between the web of the steel pipe stiffening rib 2 and the post-cast concrete also increases the tangential friction between the web of the steel pipe stiffening rib 2 and the post-cast concrete 6, further enhancing the normal shear resistance of the steel-concrete interface of the composite bridge deck.

[0024] The steel pipe stiffening rib 2 of this utility model has an internal hollow structure. By rationally designing the hollowness ratio of the steel pipe, the amount of post-cast concrete 6 in the tension zone of the bridge deck can be reduced, which significantly reduces the weight of the composite bridge deck without reducing the load-bearing capacity of the bridge deck.

[0025] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A lightweight steel-concrete composite bridge deck panel, characterized by It comprises a steel bottom plate (1), a steel pipe stiffening rib (2), a steel mesh and post-cast concrete (6), the steel pipe stiffening rib (2) is longitudinally arranged above the steel bottom plate (1), the steel bottom plate (1) and the steel pipe stiffening rib (2) are connected by an angle welding seam (3), the steel mesh is arranged above the steel pipe stiffening rib (2), and the combined bridge deck is formed by post-cast concrete (6) above the steel bottom plate (1) after the installation of the steel mesh is completed.

2. The light weight steel-concrete composite bridge deck slab according to claim 1, characterized in that, The steel mesh comprises transverse ordinary steel bars (4) and longitudinal ordinary steel bars (5), and the lower edge of the longitudinal ordinary steel bars (5) is in contact with the upper edge of the steel pipe stiffening rib (2).

3. The light weight steel-concrete composite bridge deck slab according to claim 1, wherein The steel pipe stiffening rib (2) is internally hollow.

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