Buckle assembly type composite bridge deck

Abstract

The invention relates to the field of bridge engineering, and particularly discloses a buckle assembly type composite bridge deck slab structure. The bridge deck slab is composed of cold-bent U-shaped steel, U-shaped slots, transverse steel bars and concrete. The cold-bent U-shaped steel is transversely arranged along the bridge floor, and the adjacent steel forms buckle type mechanical interlocking connection through the U-shaped slots, so that the bridge floor steel framework is formed. Round through holes are formed in the U-shaped steel and the steel plates on the two sides of the inserting groove, and transverse steel bars penetrate through the round through holes to achieve The concrete is poured above the steel framework, the thickness of the concrete is slightly larger than the height of steel plates on the two sides of the profile steel, and protection and reinforcement effects are achieved. According to the structure, a fabricated connection mode is adopted to replace traditional welding and stud connection, construction is simplified, the cost is reduced, and the durability and fatigue performance of the bridge deck slab are remarkably improved. Steel plates on the two sides of the cold-bent U-shaped steel can be used as longitudinal steel bars, the steel consumption is further reduced, and the construction efficiency is improved. The structure is novel, assembling is convenient and fast, and excellent mechanical performance and application and popularization prospects are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural engineering, and particularly relates to a buckle assembly type composite bridge deck. BACKGROUND

[0002] The bridge deck is an important component of the bridge structure which directly bears the wheel load and environmental action, and its performance has a decisive influence on the overall bearing capacity, durability and fatigue life of the bridge. With the continuous increase of traffic volume and the development of bridge construction towards large span, high bearing capacity and rapid construction, the performance requirements of the bridge deck structure and its connection mode are increasingly improved. At present, the steel-concrete composite bridge deck is widely used because it has high strength of steel structure and durability of concrete. The basic structure is to combine the steel skeleton and the concrete layer through shear connectors such as studs to bear external loads together and realize the effect of combined stress.

[0003] However, the traditional steel-concrete composite bridge deck system still has many deficiencies in practical application. First, most existing bridge decks rely on welding to fix the studs to achieve shear connection between steel and concrete. This connection mode has complex construction process, and the welding quality is easily affected by environment, operation level and welding equipment, making it difficult to ensure the consistency and standardization of construction. In addition, the welded stud connection structure is prone to stress concentration and fatigue under the cyclic action of vehicle load, and the decrease of connection stiffness will cause the slip between steel and concrete interface, which will seriously affect the overall stress performance and durability of the bridge deck. Because the studs are densely distributed, usually 20 to 100 studs per square meter of bridge deck, not only the cost of steel and labor is increased, but also the construction period is prolonged.

[0004] Secondly, the traditional welded structure has poor corrosion resistance. The welded area is prone to stress concentration and corrosion, especially in the long-term service conditions of bridges exposed to humid or salt-containing environments, which is more prone to corrosion and fatigue failure. At the same time, in order to ensure the structural strength and crack resistance, longitudinal and transverse steel bars are also needed in the traditional bridge deck, which has a complicated construction process, low efficiency, and is difficult to realize standardized and modular production, which is not conducive to the development trend of modern bridge industrialization and assembly. With the popularization of prefabricated bridge structures, the traditional welded connection system has been difficult to meet the engineering requirements of efficient construction, repeated installation and rapid replacement.

[0005] Under this background, there is an urgent need for a new type of composite bridge deck system that can achieve a simpler, more efficient and standardized connection method while maintaining high bearing capacity and good durability. This system should be able to replace welded and stud connections, reduce construction complexity, improve fatigue performance and service life, and have the characteristics of factory prefabrication and rapid assembly on site to meet the requirements of modern bridge engineering for green construction, intelligent manufacturing and efficient construction. SUMMARY

[0006] In order to improve the problems existing in the traditional steel-concrete composite bridge deck panel system, construct a bridge deck steel framework system which is fast and efficient and has reliable structure, the application provides a buckle assembly type composite bridge deck panel, so as to improve the overall performance, construction efficiency and durability of the bridge deck panel.

[0007] The application is connected through mechanical interlocking between the cold-formed U-shaped steel member and the U-shaped slot, so that the fast assembly is realized without welding operation, and the welding residual stress and welding fatigue risk are fundamentally eliminated. The effective shear connection between the concrete and the steel framework is realized through the transverse steel bars, and the structural integrity and the uplift resistance are further enhanced. The steel plates on both sides of the cold-formed U-shaped steel simultaneously serve as the longitudinal stress bars, the binding process of the traditional steel mesh can be omitted, and the material cost and the construction time are reduced. The bridge deck panel system not only has good stress performance and durability, but also can realize standardized production and modular assembly, significantly improve the construction efficiency, and has broad engineering application prospect and promotion value.

[0008] A buckle assembly type composite bridge deck panel comprises: A U-shaped steel comprises a bottom plate and a side wall arranged on the bottom plate, the U-shaped steel is arranged continuously and side by side along the bridge deck, and the side walls of two adjacent U-shaped steels are attached together to form a double-attached plate. A U-shaped slot on the double-attached plate, the opening width of the U-shaped slot is matched with the thickness of the double-attached plate. A transverse steel bar penetrating through the U-shaped slot and the double-attached plate. And concrete covering the U-shaped steel, the U-shaped slot and the transverse steel bar.

[0009] The application is connected through the assembly type connection mode, replaces the traditional welding and bolt connection, simplifies the construction, reduces the cost, and significantly improves the durability and fatigue performance of the bridge deck panel. The steel plates on both sides of the cold-formed U-shaped steel can be used as longitudinal steel bars at the same time, further reducing the amount of steel and improving the construction efficiency. The application has novel structure, convenient assembly, excellent mechanical properties and wide application prospect.

[0010] The opening of the U-shaped slot is butted to the double-attached plate, and forms a bridge deck steel framework together with the transverse steel bar.

[0011] The outer side wall of the U-shaped slot, the double-attached plate and the edge U-shaped steel is provided with a round hole for the transverse steel bar to pass through. The transverse steel bar penetrates through the U-shaped slot, the double-attached plate and the outer side wall of the edge U-shaped steel through the round hole.

[0012] The concrete is poured monolithically on top of the bridge deck steel frame, covering the U-shaped slots, double-layer bonding plates, and edge U-shaped steel. The thickness of the concrete is slightly higher than the height of the steel plates on both sides of the U-shaped steel, achieving effective protection and corrosion resistance for the steel frame.

[0013] Specifically, the composite bridge deck, composed of cold-formed U-shaped steel, includes cold-formed U-shaped steel, U-shaped slots, transverse reinforcing bars, and concrete.

[0014] In the prefabricated composite bridge deck composed of cold-formed U-shaped steel, the cold-formed U-shaped steel is placed side by side in the transverse direction of the bridge deck. It is mechanically interlocked with adjacent steel sections via U-shaped slots to form the bridge deck steel frame. The U-shaped slots are fixedly connected to the steel plates on both sides of the cold-formed U-shaped steel through a mechanical snap-fit ​​structure, forming the bridge deck steel frame. This avoids welding processes and effectively improves assembly efficiency and structural reliability.

[0015] In the prefabricated composite bridge deck composed of cold-formed U-shaped steel, corresponding through holes are provided on the cold-formed U-shaped steel and its connected U-shaped slots. The transverse reinforcing bars pass through the circular holes of each component to achieve longitudinal slip restriction and shear connection. Furthermore, a row of corresponding circular holes is provided on both sides of the cold-formed U-shaped steel and the U-shaped slots. The transverse reinforcing bars pass through the circular holes, forming a shear connection and slip restriction mechanism between the bridge deck steel frame and the concrete layer; wherein the steel plates on both sides of the cold-formed U-shaped steel and the U-shaped slots work together to form transverse bridge shear connection components.

[0016] In the prefabricated composite bridge deck composed of cold-formed U-shaped steel, concrete is poured on the bridge deck steel frame; the thickness of the concrete layer is slightly higher than the height of the steel plates on both sides of the cold-formed U-shaped steel, which plays a role in protecting the bridge deck steel frame, preventing corrosion and improving the load-bearing capacity.

[0017] The snap-fit ​​assembled composite bridge deck proposed in this invention is composed of a steel frame formed by cold-formed U-shaped steel and U-shaped slots, transverse reinforcing bars, and concrete, and has the following advantages: (1) Concrete has high compressive bearing capacity, which can effectively isolate steel from the external environment, act as a protective layer, prevent steel from rusting, and thus greatly improve the durability of bridge deck structure.

[0018] (2) The mechanical snap-fit ​​method between the U-shaped slot and the cold-formed U-shaped steel component avoids the residual stress and fatigue problems caused by traditional welding connection, simplifies the construction steps, improves the efficiency of factory prefabrication and on-site assembly, and has good industrial adaptability; the bridge deck parameters can be flexibly changed by changing the steel profile size, which facilitates design and construction while improving the modularity of the bridge deck system.

[0019] (3) The steel plate is provided with a pre-set perforation matched with the transverse steel bar arrangement, which enhances the shear connection capacity between the concrete and the steel framework; the U-shaped slot and the steel plates on both sides of the cold-bent U-shaped steel are arranged in a gradient direction in thickness, which can play a certain anti-pulling role and reduce the risk of separation of the steel and concrete interface.

[0020] (4) The steel plates on both sides of the cold-bent U-shaped steel replace the traditional studs and play a shear connection role, which significantly reduces the construction complexity and cost and significantly improves the fatigue performance of the structure.

[0021] (5) The steel plates on both sides of the cold-bent U-shaped steel play the role of longitudinal steel bars in the longitudinal direction of the bridge deck, so that the use of longitudinal steel bars can be avoided by appropriately adjusting the size of the steel, reducing the amount of steel while avoiding the binding of steel mesh, thereby significantly improving the construction efficiency and reducing the cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a transverse sectional view of the assembled composite bridge deck panel system.

[0023] Figure 2 It is a three-dimensional structure diagram of the bridge deck steel framework.

[0024] Figure 3 It is a schematic diagram of the cold-bent U-shaped steel single body structure.

[0025] Figure 4 It is a schematic diagram of the U-shaped slot single body structure. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] As shown in Figure 1 and Figure 2 , a buckle assembled composite bridge deck panel comprises the following components: a cold-bent U-shaped steel 1, a transverse steel bar 2, a U-shaped slot 3, and a concrete 4.

[0028] As shown in Figure 2 , a plurality of cold-bent U-shaped steels 1 are arranged side by side in the transverse direction of the bridge deck, and are mechanically interlocked by the U-shaped slots 3 arranged on both sides of the steel to form a stable bridge deck steel framework system. The plurality of cold-bent U-shaped steels 1 include a bottom plate and side walls arranged on the bottom plate, the side walls of two adjacent cold-bent U-shaped steels 1 are attached together to form a double-attached plate; the U-shaped slot 3 is buckled on the double-attached plate, and the opening width of the U-shaped slot 3 matches the thickness of the double-attached plate. This structure avoids the traditional welding connection method, realizes efficient assembly, and meets the requirements of modern bridge construction for assembly.

[0029] As shown in Figure 3 and Figure 4 , a plurality of cold-bent U-shaped steels 1 are arranged side by side in the transverse direction of the bridge deck, and are mechanically interlocked by the U-shaped slots 3 arranged on both sides of the steel to form a stable bridge deck steel framework system. The plurality of cold-bent U-shaped steels 1 include a bottom plate and side walls arranged on the bottom plate, the side walls of two adjacent cold-bent U-shaped steels 1 are attached together to form a double-attached plate; the U-shaped slot 3 is buckled on the double-attached plate, and the opening width of the U-shaped slot 3 matches the thickness of the double-attached plate. This structure avoids the traditional welding connection method, realizes efficient assembly, and meets the requirements of modern bridge construction for assembly.As shown, each cold-bent U-shaped steel 1 and its corresponding U-shaped slot 3 side wall is provided with a row of corresponding circular perforations, and the transverse steel bars 2 are inserted through the perforations to pass through the integrally cast steel framework, realizing transverse shear connection and overall enhancement.

[0030] As shown in Figure 1 and Figure 2 As shown, the concrete 4 is integrally cast on the steel framework of the bridge deck, and its thickness is slightly higher than the height of the steel plates on both sides of the U-shaped steel 1, so as to realize the wrapping and protection of the steel framework.

[0031] The buckle assembly type composite bridge deck panel provided by the application significantly improves the overall durability and service life of the bridge deck panel structure through systematic optimization of the construction level and connection method. The bridge deck panel structure uses a prefabricated cold-bent U-shaped steel assembly with holes as the main force unit, and realizes buckle type mechanical interlocking connection between adjacent steel components through specially designed U-shaped slot components, and is supplemented by transversely inserted steel bars as shear transfer media between the steel framework and the concrete layer of the bridge deck panel, forming a new efficient composite connection system. Compared with the bolted and welded connection method commonly used in traditional bridge deck panels, the application realizes more stable and reliable shear connection effect through the "cold-bent U-shaped steel + buckle slot + through steel bar" triple structure, and also has certain uplift resistance, so as to completely replace the function of the bolt in most use scenarios. According to relevant structural mechanics research and engineering experience data, in the traditional steel-concrete composite bridge deck panel, about 20 to 100 welded bolts per square meter of panel are usually needed to meet the complete shear connection performance required in the use stage, and the number will also increase accordingly with changes in the thickness of the concrete layer, the strength grade of the concrete, the design load grade and other factors. This not only brings huge material cost and welding construction cost, but also has a significant negative impact on the fatigue performance and durability of the structure, which is a weak link in the service of the structure.

[0032] The application completely abandons the traditional welding connection method and adopts an efficient buckle assembly mechanism, effectively avoiding problems such as welding residual stress, construction error and fatigue damage. At the same time, the steel plates on both sides of the cold-bent U-shaped steel have good stress performance and can replace the function of the longitudinal stress steel bar in the structural design, so that no additional longitudinal steel bar arrangement is needed in the bridge deck panel, further reducing the construction steps of steel bar binding and steel bar meshing, significantly reducing the consumption of structural materials, and greatly improving the overall construction efficiency and on-site assembly speed.

[0033] In summary, the buckle assembly type composite bridge deck slab provided by the application not only has better shear connection and durability characteristics than traditional schemes in structural performance, but also has obvious advantages in construction methods, process flows, material consumption and maintenance performance, and has good engineering adaptability and application value. The structural system meets the overall trend of industrialized construction, assembly type construction, high reliability and low cost development of modern bridge structures, and can be widely applied to various highway bridges, railway bridges and municipal bridge deck systems in the future, and has important technical significance and practical value.

Claims

1. A snap-fit ​​assembled composite bridge panel, characterized in that, include: U-shaped steel, the U-shaped steel includes a base plate and side walls disposed on the base plate, the U-shaped steel is arranged continuously side by side along the transverse direction of the bridge deck, and the side walls of two adjacent U-shaped steels are bonded together to form a double-layer bonded plate; A U-shaped slot is snapped onto the double-layer laminated board, and the opening width of the U-shaped slot matches the thickness of the double-layer laminated board; Transverse reinforcing bars penetrating the U-shaped slot and the double-layer bonding plate; And the concrete covering the U-shaped steel, U-shaped slot and transverse reinforcing bars.

2. The snap-fit ​​assembled composite bridge panel according to claim 1, characterized in that, The opening of the U-shaped slot is connected to the double-layer bonding plate, forming a bridge deck steel skeleton together with the transverse steel bars.

3. The prefabricated composite bridge deck composed of cold-formed U-shaped steel according to claim 1, characterized in that, The outer walls of the U-shaped slot, the double-layer bonding plate, and the edge U-shaped steel are all provided with round holes for the transverse reinforcing bars to pass through.

4. The prefabricated composite bridge deck composed of cold-formed U-shaped steel according to claim 3, characterized in that, The transverse reinforcing bars pass through the circular holes, penetrating the outer wall of the U-shaped slot, the double-layer bonding plate, and the edge U-shaped steel.

5. The prefabricated composite bridge deck composed of cold-formed U-shaped steel according to claim 1, characterized in that, The concrete is poured on top of the bridge deck steel frame, covering the U-shaped slot, double-layer bonding plate and edge U-shaped steel.

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