Corrugated steel web steel-concrete composite continuous beam structure

Abstract

This utility model discloses a corrugated steel web steel-concrete composite continuous beam structure, including a support negative bending moment region and a mid-span positive bending moment region; the support negative bending moment region includes a negative bending moment region top plate and a negative bending moment region web (1); the negative bending moment region top plate is a concrete slab; the negative bending moment region web is a corrugated steel web; the mid-span positive bending moment region is a single-layer composite steel-concrete beam structure, including a positive bending moment region top plate, a positive bending moment region bottom plate, and a positive bending moment region web; the positive bending moment region top plate is a concrete slab; the positive bending moment region bottom plate and the positive bending moment region web are both steel plate structures. During construction, all support negative bending moment regions are constructed first, then all mid-span positive bending moment regions are constructed, and finally a transition section is set between the bottom plate of each negative bending moment region and the corresponding bottom plate of the positive bending moment region. This utility model fully utilizes the respective characteristics of steel and concrete materials, ensures the overall load-bearing performance of the composite continuous beam structure, and also achieves lightweighting and convenient construction.

Description

Technical Field

[0001] This utility model relates to the field of continuous beam construction technology, and in particular to a corrugated steel web steel-concrete composite continuous beam structure. Background Technology

[0002] Steel-concrete composite bridges can fully utilize the material properties of both concrete and steel. With their outstanding advantages such as rational overall stress distribution, economy, and ease of construction, they have good comprehensive technical, economic, and social benefits and have been widely used in many practical bridge projects.

[0003] For continuous steel-concrete composite bridges with main spans of 80m to 150m, the concrete bridge deck will experience significant tensile stress due to the large negative bending moment in the mid-support area. Improper handling can lead to cracking of the concrete bridge deck in the negative bending moment area, and in severe cases, it may even endanger the structural safety.

[0004] To address the aforementioned problems, the traditional direct solution is to apply prestress to the bridge deck in the negative bending moment zone to offset tensile stress. However, due to the stress characteristics of conventional steel-concrete composite structures, a portion of the prestress is applied to the steel structure. Furthermore, the shrinkage and creep of concrete further reduces the effective prestress in the concrete bridge deck, making it difficult to achieve the desired effect. Cracking of the concrete bridge deck in the negative bending moment zone remains a significant hidden danger throughout the entire service life of the composite beam structure. Common methods also include using reinforced steel reinforcement and supplementing it with other process measures (such as lifting methods, weight application and release, etc.) to reduce the negative bending moment. These process measures involve significant steps, have relatively limited effectiveness, and greatly increase the workload, project investment, and construction period.

[0005] Therefore, how to fully utilize the respective properties of steel and concrete materials in the construction of continuous beams, ensure the overall load-bearing performance of the composite continuous beam structure, and achieve lightweight and convenient construction has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a corrugated steel web steel-concrete composite continuous beam structure. The purpose is to fully utilize the respective characteristics of steel and concrete materials in the construction of continuous beams, ensure the overall stress performance of the composite continuous beam structure, and achieve lightweight and convenient construction.

[0007] To achieve the above objectives, this utility model discloses a corrugated steel web steel-concrete composite continuous beam structure, including a negative bending moment region at the supports and a positive bending moment region at mid-span.

[0008] The negative bending moment region at the fulcrum includes a top plate of the negative bending moment region and a web plate of the negative bending moment region;

[0009] The top slab of the negative bending moment zone is a concrete slab;

[0010] The web of the negative bending moment zone is a corrugated steel web;

[0011] The mid-span positive bending moment region is a single-layer composite steel-concrete beam structure, including a top plate of the positive bending moment region, a bottom plate of the positive bending moment region, and a web of the positive bending moment region;

[0012] The top slab of the positive bending moment zone is a concrete slab;

[0013] Both the bottom plate of the positive bending moment zone and the web plate of the positive bending moment zone are steel plate structures.

[0014] Preferably, a negative bending moment zone bottom plate is also provided below the negative bending moment zone top plate, forming a double-layered structure.

[0015] Preferably, prestressed steel strands are provided in the top plate of the negative bending moment zone.

[0016] Preferably, the negative bending moment zone bottom plate and the positive bending moment zone bottom plate are connected by a steel structure as a transition section to transfer the internal forces between the corresponding concrete slab and the corresponding steel structure.

[0017] The beneficial effects of this utility model are:

[0018] This invention can fully utilize the characteristics of steel and concrete materials in the construction of continuous beams, ensuring the overall stress performance of the composite continuous beam structure, while also achieving lightweighting and convenient construction.

[0019] This invention fully utilizes the properties of both steel and concrete, and by employing corrugated steel web beams in the negative bending moment area, it improves the efficiency of prestressing application, reduces the risk of bridge deck cracking in the negative bending moment area, and enhances structural safety and durability.

[0020] This invention can fully utilize the optimal properties of each material, while improving the efficiency of prestressing application, thus effectively saving engineering construction costs.

[0021] This invention allows for faster and more convenient construction. Compared to commonly used methods for reducing negative bending moments, it greatly simplifies the construction process and increases construction speed.

[0022] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0023] Figure 1 This diagram shows a structural schematic of the bottom plate with a negative bending moment region and a negative bending moment region in one embodiment of the present invention.

[0024] Figure 2This diagram illustrates a double-overlapping structure in one embodiment of the present invention, comprising a negative bending moment region top plate and a negative bending moment region bottom plate.

[0025] Figure 3 This diagram shows a cross-sectional view of a double-overlapping structure according to an embodiment of the present invention. Detailed Implementation

[0026] Example: Figure 1 As shown, the corrugated steel web steel-concrete composite continuous beam structure includes a negative bending moment region at the supports and a positive bending moment region at mid-span.

[0027] The negative bending moment region at the fulcrum includes the top plate 2 of the negative bending moment region and the web 1 of the negative bending moment region;

[0028] The top slab 2 in the negative bending moment zone is a concrete slab;

[0029] Web 1 in the negative bending moment zone is a corrugated steel web;

[0030] The positive bending moment region at mid-span is a single-layer composite steel-concrete beam structure, including the top plate, bottom plate, and web of the positive bending moment region;

[0031] The top slab in the positive bending moment zone is a concrete slab;

[0032] Both the bottom plate and the web of the positive bending moment zone are steel plate structures.

[0033] Corrugated steel web PC composite beam bridge is a relatively new type of composite beam bridge. The accordion effect of its corrugated steel plates gives the composite structure a smaller longitudinal stiffness and improves the efficiency of prestressing application.

[0034] This utility model utilizes the aforementioned characteristics of corrugated steel webs, which can fully leverage the respective properties of steel and concrete materials to ensure the overall load-bearing performance of the composite continuous beam structure, while also being lightweight, easy to construct, and offering good economic benefits.

[0035] Furthermore, in this invention, both the negative bending moment region at the support point and the positive bending moment region at mid-span use concrete slabs as the top plate 2 of the negative bending moment region and the top plate of the positive bending moment region, which can be directly and smoothly connected.

[0036] like Figure 2 and Figure 3 As shown, in some embodiments, a negative bending moment zone bottom plate 3 is also provided below the negative bending moment zone top plate 2, forming a double-overlapping structure.

[0037] In some embodiments, prestressed steel strands are provided in the top slab 2 of the negative bending moment zone.

[0038] In practical applications, the prestressed steel strands are set according to the stress conditions in the top slab 2 of the negative bending moment zone.

[0039] In some embodiments, the negative bending moment zone bottom plate 3 and the positive bending moment zone bottom plate are connected by a steel structure as a transition section to transfer the internal forces between the corresponding concrete slab and the corresponding steel structure.

[0040] This utility model also provides a construction method for a corrugated steel web steel-concrete composite continuous beam structure, including the following steps:

[0041] Step 1: Construct all negative bending moment areas at all supports using cantilever casting or cantilever assembly methods;

[0042] Step 2: Based on the span conditions, use a steel structure with no or few supports to install all positive bending moment areas at mid-span in one go or in sections;

[0043] Based on the stress and on-site construction conditions, the top plate, bottom plate and web of the positive bending moment zone are stacked together and then installed in one go or in stages.

[0044] Step 3: Set up a steel structure as a transition section between the bottom plate 3 of each negative bending moment zone and the corresponding bottom plate of the positive bending moment zone to transfer the internal forces between the corresponding concrete slab and the corresponding steel structure.

[0045] This invention has better overall rigidity, as detailed below:

[0046] In the negative bending moment region at the support, a double-layer form of concrete and corrugated steel web is adopted. The corrugated web has a small longitudinal stiffness, high prestressing efficiency, and is less affected by concrete shrinkage and creep and temperature gradient, which fully improves the crack resistance of the bridge deck in the negative bending moment region, while effectively utilizing the compressive performance of the bottom edge concrete and the shear performance of the corrugated steel web.

[0047] In the positive bending moment region at mid-span, a single-layer steel-concrete composite structure using a concrete slab as the top slab of the positive bending moment region can fully utilize the tensile performance of the steel structure in the positive bending moment region and effectively utilize the compressive performance of the concrete slab, thus achieving good structural stress performance. The composite method of using a concrete slab as the top slab of the positive bending moment region also facilitates the smooth transition between the positive bending moment region at mid-span and the negative bending moment region at the support. A steel structure is set between the bottom slab 3 of the negative bending moment region and the bottom slab of the positive bending moment region to transfer internal forces in the transition section between the bottom slab and the concrete bottom slab.

[0048] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A corrugated steel web steel-concrete composite continuous beam structure; characterized in that, This includes the negative bending moment region at the support and the positive bending moment region at mid-span. The negative bending moment region at the fulcrum includes the top plate (2) of the negative bending moment region and the web plate (1) of the negative bending moment region. The top slab (2) of the negative bending moment zone is a concrete slab; The negative bending moment zone web (1) is a corrugated steel web; The mid-span positive bending moment region is a single-layer composite steel-concrete beam structure, including a top plate of the positive bending moment region, a bottom plate of the positive bending moment region, and a web of the positive bending moment region; The top slab of the positive bending moment zone is a concrete slab; Both the bottom plate of the positive bending moment zone and the web plate of the positive bending moment zone are steel plate structures.

2. The corrugated steel web steel-concrete composite continuous beam structure according to claim 1, characterized in that, The negative bending moment zone top plate (2) is further provided with a negative bending moment zone bottom plate (3) to form a double-overlapping structure.

3. The corrugated steel web steel-concrete composite continuous beam structure according to claim 1 or 2, characterized in that, Prestressed steel strands are installed in the top plate (2) of the negative bending moment zone.

4. The corrugated steel web steel-concrete composite continuous beam structure according to claim 2, characterized in that, The negative bending moment zone bottom plate (3) and the positive bending moment zone bottom plate are connected by a steel structure as a transition section to transfer the internal forces between the corresponding concrete slab and the corresponding steel structure.

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