VFT steel-concrete composite beam structure

Abstract

The utility model discloses a VFT steel-concrete composite beam structure. The precast concrete beam is arranged in the center of the bottom of the precast concrete bridge deck, and the precast concrete beam and the precast concrete bridge deck form a T-shaped structure; the steel beam is of an inverted-T-shaped structure and partially extends into the center position of the end, away from the prefabricated concrete bridge deck slab, of the prefabricated concrete beam. The cast-in-place bridge deck is arranged at the end, away from the prefabricated concrete beam, of the prefabricated concrete bridge deck. The height of the cast-in-place bridge deck is larger than that of the prefabricated concrete bridge deck. The prefabricated concrete beams and the steel beams are manufactured in a prefabrication processing plant, and due to the fact that the structure is decomposed into small prefabricated parts, the prefabricated concrete beams and the steel beams can be transported for a long distance or a short distance through standard transportation tools more easily. Therefore, according to the design that the main beam body is divided into the prefabricated concrete beam and the steel beam, light weight and convenient transportation of the structure are achieved, and the expansibility, flexibility and environmental protection performance of bridge construction are improved.

Description

Technical Field

[0001] The present application relates to the technical field of bridge structures, and in particular to a VFT steel-concrete composite beam structure. Background Art

[0002] With the continuous advancement of bridge construction technology, the concept of prefabrication has been extended from the traditional superstructure to the substructure, which marks a significant improvement in the degree of bridge prefabrication. Today, the scope of prefabricated components has widely covered various parts such as main beams, piers, abutments, foundations, crash walls, cap beams, etc.

[0003] However, due to their large size, concrete bridge components do place extremely high demands on transportation and hoisting during prefabrication. Although the traditional solid component design is structurally stable, it results in excessive weight of the components, which increases the difficulty and cost of transportation, and also places high demands on hoisting equipment. Utility Model Content

[0004] The embodiment of the present application provides a VFT steel-concrete composite beam structure to solve the technical problems in the prior art that precast concrete bridge components are too heavy, which increases the difficulty and cost of transportation and places high requirements on lifting equipment.

[0005] An embodiment of the present application provides a VFT steel-concrete composite beam structure, comprising a precast concrete bridge deck, a precast concrete beam, a steel beam and a cast-in-place bridge deck; the precast concrete beam is arranged at the center position of the bottom of the precast concrete bridge deck, and the precast concrete beam and the precast concrete bridge deck form a T-shaped structure; the steel beam is an inverted T-shaped structure, and partially extends into the center position of one end of the precast concrete beam away from the precast concrete bridge deck; the cast-in-place bridge deck is arranged at one end of the precast concrete bridge deck away from the precast concrete beam; the height of the cast-in-place bridge deck is higher than the height of the precast concrete bridge deck.

[0006] In a possible implementation, the VFT steel-concrete composite beam structure further includes a comb plate shear key; the comb plate shear key is arranged at a central position of an end of the steel beam extending into the precast concrete beam.

[0007] In a possible implementation, the height of the comb plate shear key is 60 mm.

[0008] In a possible implementation, the height ratio of the cast-in-place bridge deck to the precast concrete bridge deck is 3:2.

[0009] In a possible implementation, a groove is provided at the end of the side of the precast concrete bridge deck away from the precast concrete beam, and the groove faces the adjacent precast concrete bridge deck; the cast-in-place bridge deck extends into the groove.

[0010] In a possible implementation, the longitudinal section of the groove is a right trapezoid or a right triangle.

[0011] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0012] The VFT steel-concrete composite beam structure provided in the embodiments of the present application includes a precast concrete bridge deck, a precast concrete beam, a steel beam, and a cast-in-place bridge deck. In a prefabrication factory, first, the steel beam is prepared; subsequently, the steel skeletons of the precast concrete bridge deck and the precast concrete beam are arranged, and the steel beam is accurately inserted into the center position at the bottom of the steel skeleton of the precast concrete beam; then, concrete is poured to form the precast concrete bridge deck and the precast concrete beam, and it is ensured that the precast concrete bridge deck, the precast concrete beam, and the steel beam are closely combined into an integral precast component; after the concrete reaches the designed strength requirements, the precast component is transported to a preset bridge construction site for installation; finally, multiple precast components are arranged in sequence along the transverse bridge direction, and a steel mesh is arranged on the top of the precast concrete bridge deck, and then concrete is poured to form a continuous cast-in-place bridge deck. By decomposing the main beam into a precast concrete beam and a steel beam, the present application makes full use of the characteristics of the two materials. Concrete becomes the main part bearing the vertical load due to its good compressive performance, while steel undertakes more tensile and shear forces with its high strength and light weight characteristics, effectively reducing the weight of the overall structure. At the same time, this lightweight design not only reduces the material cost but also reduces the requirements for the bridge foundation, making the bridge construction more economical and efficient. The precast component is both a part of the main beam body and also serves as part of the bridge deck, which not only reduces the weight of the main beam but also has the function of the bridge deck, reducing complex processes such as formwork support for the cast-in-place bridge deck. In addition, the precast concrete beam and the steel beam of the present application are both manufactured in the prefabrication factory and meet relatively high precision and quality control standards. Since the structure is decomposed into smaller precast components, they are more easily transported over long or short distances by standard transportation tools. This not only reduces the risk of damage during transportation but also improves the transportation efficiency, enabling the bridge construction to be carried out faster at different locations. Therefore, the design of dividing the main beam body into a precast concrete beam and a steel beam in the present application not only achieves the lightweight and convenient transportation of the structure but also greatly improves the expandability, flexibility, and environmental performance of the bridge construction. Description of the Drawings

[0013] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description in the embodiments of the present application. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a schematic structural diagram of the VFT steel-concrete composite beam structure provided by the embodiment of the present application;

[0015] Figure 2 is Figure 1 partial enlarged view at A of;

[0016] Figure 3 is Figure 1 left view of;

[0017] Figure 4 It is a schematic structural diagram of the comb tooth plate shear key provided by the embodiment of the present application.

[0018] Icon: 1 - precast concrete bridge deck; 11 - groove; 2 - precast concrete beam; 3 - steel beam; 31 - comb tooth plate shear key; 4 - cast-in-place bridge deck. Specific embodiments

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.

[0020] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0021] An embodiment of the present application provides a VFT steel-concrete composite beam structure, as Figures 1 to 4 shown. The VFT steel-concrete composite beam structure includes a precast concrete bridge deck 1, a precast concrete beam 2, a steel beam 3, and a cast-in-place bridge deck 4. The precast concrete beam 2 is arranged at the central position at the bottom of the precast concrete bridge deck 1, and the precast concrete beam 2 and the precast concrete bridge deck 1 form a T-shaped structure. The steel beam 3 is an inverted T-shaped structure, and part of it extends into the central position at one end of the precast concrete beam 2 away from the precast concrete bridge deck 1. The steel beam 3 of the present application is a steel structure. Compared with the traditional concrete structure, the steel structure prefabricated parts do not require a large amount of formwork support during the manufacturing process, which not only saves formwork materials, but also simplifies the manufacturing process and improves production efficiency.

[0022] The cast-in-place bridge deck 4 is arranged at one end of the precast concrete bridge deck 1 away from the precast concrete beam 2. The height of the cast-in-place bridge deck 4 is higher than that of the precast concrete bridge deck 1.

[0023] VFT is an abbreviation of the German word Verbund-Fertigteil-Bauweise, which means a prefabricated composite construction technology bridge.

[0024] It should be noted that, in the prefabrication plant, the steel beam 3 is first prepared; then, the steel skeleton of the precast concrete bridge deck 1 and the precast concrete beam 2 is laid out, and the steel beam 3 is precisely inserted into the center position of the bottom of the steel skeleton of the precast concrete beam 2; then, concrete is poured to form the precast concrete bridge deck 1 and the precast concrete beam 2, and it is ensured that the precast concrete bridge deck 1, the precast concrete beam 2 and the steel beam 3 are tightly combined into an integral prefabricated component; after the concrete reaches the strength required by the design, the prefabricated component is transported to the preset bridge construction site for installation; finally, multiple prefabricated components are arranged in sequence upward along the horizontal bridge, and a steel mesh is laid on the top of the precast concrete bridge deck 1, and then concrete is poured to form a continuous cast-in-place bridge deck 4. This application makes full use of the characteristics of the two materials by decomposing the main beam into precast concrete beams 2 and steel beams 3. Concrete becomes the main part of the vertical load due to its good compressive resistance, while steel bears more tension and shear force with its high strength and light weight, effectively reducing the weight of the overall structure. At the same time, this lightweight design not only reduces the material cost, but also reduces the requirements for the bridge foundation, making bridge construction more economical and efficient. The prefabricated component is not only a part of the main beam body, but also takes into account part of the bridge deck. It not only reduces the weight of the main beam but also has the function of the bridge deck, reducing the complex processes such as the 4 molds of the cast-in-place bridge deck. In addition, the precast concrete beam 2 and steel beam 3 of the present application are all completed in the prefabrication processing plant and meet high precision and quality control standards. Since the structure is decomposed into smaller prefabricated components, they are easier to transport long or short distances by standard transportation tools. This not only reduces the risk of damage during transportation, but also improves transportation efficiency, allowing bridge construction to be carried out faster in different locations. Therefore, the design of dividing the main beam body into precast concrete beams 2 and steel beams 3 in the present application not only achieves the lightweight and convenient transportation of the structure, but also greatly improves the scalability, flexibility and environmental protection performance of bridge construction.

[0025] Specifically, the cast-in-place bridge deck 4 and the precast concrete bridge deck 1 are cast-in-place into one piece by chiseling the surface, roughening it, and then laying out the horizontal and vertical reinforcements to form the bridge deck.

[0026] In the embodiment of the present application, the VFT steel-concrete composite beam structure further includes a comb plate shear key 31. The comb plate shear key 31 is arranged at the center position of the end of the steel beam 3 extending into the precast concrete beam 2.

[0027] It should be noted that the comb-tooth shear key 31, as a key component connecting the steel beam 3 and the precast concrete beam 2, can effectively transfer the shear force between the two. Under the action of load, there is a tendency of relative slip between the steel beam 3 and the concrete beam, and the comb-tooth shear key 31 increases the contact area through its unique tooth shape design, thereby improving the shear bearing capacity. The tight engagement of the comb-tooth shear key 31 can reduce the relative slip between the steel beam 3 and the precast concrete beam 2, ensure coordinated deformation of the two during the stress process, and improve the stability and safety of the overall structure.

[0028] In the embodiment of the present application, the height of the comb-tooth shear key 31 is 60 mm. Specifically, the comb-tooth shear key 31 is provided with fourteen comb-tooth parts, and the length of the straight section at the top of each comb-tooth part is 100 mm.

[0029] In the embodiment of the present application, the height ratio of the cast-in-place bridge deck 4 to the precast concrete bridge deck 1 is 3:2.

[0030] It should be noted that by adjusting the height ratio of the cast-in-place bridge deck 4 to the precast concrete bridge deck 1 in the present application, the stress distribution of the structure during stress can be made more uniform, which helps to reduce the local stress concentration phenomenon and improve the bearing capacity and stability of the overall structure.

[0031] In the embodiment of the present application, a groove 11 is provided at the end of the precast concrete bridge deck 1 on the side away from the precast concrete beam 2, and the groove 11 faces the adjacent precast concrete bridge deck 1. The cast-in-place bridge deck 4 extends into the groove 11.

[0032] It should be noted that the cast-in-place bridge deck 4 extends into the groove 11 of the precast concrete bridge deck 1, and through the pouring of the wet joint, a tighter and more firm connection is formed between the precast concrete bridge deck 1 and the cast-in-place bridge deck 4. This connection method enhances the integrity of the structure, enabling the bridge deck system to better resist external loads and deformations.

[0033] In the embodiment of the present application, the longitudinal section of the groove 11 is a right trapezoid or a right triangle, so that the adjacent two grooves 11 form an isosceles trapezoid or an isosceles triangle.

[0034] It should be noted that the structural form of the isosceles trapezoid or isosceles triangle can more effectively resist the deformation caused by external loads, improve the bearing capacity and stability of the bridge deck system. The joint between the groove 11 and the cast-in-place bridge deck 4 forms an effective shear connection surface. Under the action of shear force, this connection can resist the relative slip and dislocation between the bridge decks, improving the shear performance of the bridge deck system. The structural form of the isosceles trapezoid or isosceles triangle further enhances this shear effect.

[0035] The various embodiments in this specification are described in a progressive manner. For the same or similar parts among the various embodiments, reference can be made to each other, and the key points of each embodiment are the differences from other embodiments.

[0036] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of their technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A VFT steel-concrete composite beam structure, characterized in that: It comprises a precast concrete bridge deck (1), a precast concrete beam (2), a steel beam (3) and a cast-in-place bridge deck (4); The precast concrete beam (2) is arranged at the center position of the bottom of the precast concrete bridge deck (1), and the precast concrete beam (2) and the precast concrete bridge deck (1) form a T-shaped structure; The steel beam (3) is an inverted T-shaped structure, and partially extends into the center position of one end of the precast concrete beam (2) away from the precast concrete bridge deck (1); The cast-in-place bridge deck (4) is arranged at one end of the precast concrete bridge deck (1) away from the precast concrete beam (2); The height of the cast-in-place bridge deck (4) is higher than the height of the precast concrete bridge deck (1).

2. The VFT steel-concrete composite beam structure according to claim 1 is characterized in that: Also includes a comb plate shear key (31); The comb plate shear key (31) is arranged at the center position of one end of the steel beam (3) extending into the precast concrete beam (2).

3. The VFT steel-concrete composite beam structure according to claim 2 is characterized in that: The height of the comb plate shear key (31) is 60 mm.

4. The VFT steel-concrete composite beam structure according to claim 1, characterized in that: The height ratio between the cast-in-place bridge deck (4) and the precast concrete bridge deck (1) is 3:

2.

5. The VFT steel-concrete composite beam structure according to claim 1, characterized in that: A groove (11) is provided at the end of the precast concrete bridge deck (1) away from the precast concrete beam (2), and the groove (11) faces the adjacent precast concrete bridge deck (1); The cast-in-place bridge deck (4) extends into the groove (11).

6. The VFT steel-concrete composite beam structure according to claim 5, characterized in that: The longitudinal section of the groove (11) is a right-angled trapezoid or a right-angled triangle.

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