Prestressed concrete box girder and steel box girder nested combined structure

Abstract

The utility model discloses a prestressed concrete box girder nested steel box girder combined structure, which is characterized in that concrete flange plates are arranged in parallel, and concrete webs are arranged in parallel to form a box girder structure; h-shaped steel is arranged in the concrete flange plates and the concrete webs, a cavity is formed in an enclosed area of a box beam structure formed by the concrete flange plates and the concrete webs, and prestressed steel strands are arranged in the concrete webs on the two sides, longitudinally penetrate through the concrete webs and are arranged in a curve shape in the concrete webs. According to the scheme, the H-shaped steel and concrete combined component is adopted, the bearing capacity and rigidity of the structure are remarkably improved compared with a common reinforced concrete structure, stress control over a tensile stress area of the steel reinforced concrete component can be achieved by combining the prestressed steel strands, and therefore the working performance of the component in the normal use stage is remarkably improved; the self-weight of the structure is optimized to a certain extent, the cost is effectively saved, and the safety performance of the structure is improved.

Description

Technical Field

[0001] The utility model belongs to the field of building beam structures, and in particular relates to a prestressed concrete box beam nested steel box beam combined structure. Background Art

[0002] With the rapid development of society in recent years, the application of large-span structural systems has become increasingly widespread, providing a huge impetus for the progress of urban construction and public facilities. However, this growth has also increased the difficulty of a series of design and construction aspects. The stress conditions of large-span structural systems are complex, especially the requirements for materials are extremely high. In order to meet the needs of strength and stability, high-strength and high-toughness materials are usually required, such as high-strength concrete, steel sections, and prestressed steel strands. In addition, large-span structural systems may have some durability problems during long-term use. Due to the complex stress conditions, some parts of the structure may experience stress concentration, fatigue damage, and other problems, which in turn affect the safety and stability of the entire structure.

[0003] The stress characteristics of the existing beam-slab structural scheme are relatively clear. In terms of structural beams, the current schemes mainly include reinforced concrete structural beams, prestressed concrete structural beams, steel-concrete structural beams, etc., and these components have been widely used in various building systems. Traditional reinforced concrete beams have low bearing capacity and are difficult to use in large-span structural systems; steel-concrete structural beams are suitable for structural systems within a certain span range, and their bearing capacity is relatively high, but as the structural span increases further, component deformation and crack resistance become constraints on the use of this type of beam; prestressed concrete structural beams can significantly improve component deformation and crack resistance, but their bearing capacity is relatively weak for large-span structures, and large-span structural systems will lead to an increase in component size, which will increase the deadweight of the component, affect the use space, and have poor economy. Summary of the invention

[0004] In order to solve the above-mentioned technical defects in the prior art, the utility model proposes a prestressed concrete box girder nested steel box girder composite structure, which solves the problem of large-span structural system that is difficult to solve with traditional components, and at the same time has the advantages of high bearing capacity, small deformation, strong crack resistance, better durability than steel structure, large rigidity, and small component cross-sectional size.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A prestressed concrete box girder nested steel box girder composite structure, comprising a concrete flange plate, a concrete web plate and an H-shaped steel;

[0007] The concrete flange plates are arranged in parallel, and the concrete web plates are arranged in parallel, and together they form a box beam structure;

[0008] H-shaped steel is arranged inside the concrete flange plate and the concrete web plate.

[0009] Furthermore, the H-shaped steel webs in the concrete webs on both sides are arranged parallel to the concrete webs.

[0010] Furthermore, the interior of the enclosed area of ​​the box beam structure formed by the concrete flange plate and the concrete web plate is a cavity.

[0011] Furthermore, prestressed steel strands are arranged in the concrete webs on both sides;

[0012] The prestressed steel strands are arranged longitudinally parallel to the web of the H-shaped steel.

[0013] Furthermore, the prestressed steel strands penetrate the concrete web longitudinally and are arranged in a curved shape inside the concrete web.

[0014] Furthermore, there are multiple prestressed steel strands.

[0015] Furthermore, longitudinal steel bars are arranged inside the concrete flange plate, and the longitudinal steel bars are arranged on the upper and lower sides of the H-shaped steel flange and are arranged parallel to the H-shaped steel.

[0016] Furthermore, longitudinal steel bars are arranged inside the concrete web, and the longitudinal steel bars are arranged on the left and right sides of the web of the H-shaped steel and are arranged parallel to the H-shaped steel.

[0017] Furthermore, annular stirrups are arranged in the concrete flange plate and the concrete web plate, and the annular stirrups are arranged perpendicular to the H-shaped steel.

[0018] Compared with the prior art, the utility model has the following significant advantages:

[0019] The utility model is mainly used for large-span building structure systems. The overall component form is a prestressed concrete box beam nested in a steel box beam composite structure. The prestressing force can effectively improve the performance of the structure during the service phase, control the development of cracks and eliminate structural disturbances, and improve the shear bearing capacity and fatigue strength. It fully utilizes high-strength prestressed steel strands to effectively adjust the internal force of the structure.

[0020] In addition, the steel-concrete structure used in this scheme has significantly improved bearing capacity and stiffness compared to ordinary reinforced concrete structures, and is particularly suitable for use in large-span, heavy-load building structures. In addition, the steel-concrete structure also has very good ductility and energy absorption capacity.

[0021] Finally, the prestressed technology based on the utility model can realize the stress control of the tensile stress zone of the steel-concrete component, thereby significantly improving the working performance of the component during the normal use stage. It has the dual advantages of prestressed concrete structure and steel-concrete structure, so that the strength of steel can be fully utilized, greatly improving the bearing capacity of the component, and using the good ductility of prestressed technology to improve the structure's ability to resist deformation and cracking;

[0022] Moreover, the hollow composite structural components adopted in this scheme optimize the structural deadweight to a certain extent, effectively save costs and improve the structural safety performance.

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of the composite structure of the prestressed concrete box girder and the nested steel box girder of the utility model.

[0025] Figure 2 It is an axonometric diagram of the composite structure of the prestressed concrete box girder and the nested steel box girder of the utility model. DETAILED DESCRIPTION

[0026] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can imagine a variety of implementation methods of the utility model. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the utility model or as a limitation or limitation of the technical solution of the utility model. On the contrary, the purpose of providing these embodiments is to enable those skilled in the art to understand the utility model more thoroughly. The preferred embodiments of the utility model are described in detail below in conjunction with the accompanying drawings, wherein the drawings constitute a part of this application and are used together with the embodiments of the utility model to illustrate the innovative concept of the present invention.

[0027] Example

[0028] Combination Figure 1 and Figure 2 , a prestressed concrete box girder nested steel box girder composite structure, comprising a concrete flange plate 1, a concrete web plate 2 and an H-shaped steel 3;

[0029] The concrete flange plates 1 are arranged in parallel, and the concrete web plates 2 are arranged in parallel, and together they form a box beam structure;

[0030] The concrete flange plate 1 and the concrete web plate 2 form a box beam structure with built-in double H-shaped steel 3. Structural bolts are arranged on the surface of the H-shaped steel 3, and the H-shaped steel 3 is cast into one with the concrete flange plate 1 and the concrete web plate 2 through concrete.

[0031] In addition, the H-shaped steel 3 webs in the concrete webs 2 on both sides are arranged parallel to the concrete webs 2 to form a double H-shaped steel concrete box-type composite beam, and the box-type beam structure enclosed by the concrete flange plate 1 and the concrete webs 2 is a cavity.

[0032] Several post-tensioned prestressed steel strands 4 are arranged in the concrete webs 2 on both sides. The length direction of the prestressed steel strands 4 is arranged parallel to the longitudinal direction of the web of the H-shaped steel 3. The prestressed steel strands 4 penetrate the concrete webs 2 and are arranged in a curved shape in the concrete webs 2, that is, the part of the prestressed steel strands 4 inside the concrete webs 2 is curved inside the upper and lower flanges of the H-shaped steel 3 when viewed from the vertical direction;

[0033] The concrete flange plate 1 is provided with longitudinal common steel bars 5 , which are arranged on the upper and lower sides of the flange of the H-shaped steel 3 and are arranged parallel to the H-shaped steel 3 .

[0034] The interior of the concrete web 2 is also provided with longitudinal common steel bars 5 , which are arranged on the left and right sides of the web of the H-shaped steel 3 and are arranged parallel to the H-shaped steel 3 .

[0035] Circumferential stirrups 6 are also arranged in the concrete flange plate 1 and the concrete web plate 2. The circular stirrups 6 are arranged perpendicular to the H-shaped steel 3 to improve the shear strength of the inclined section, and are connected with the longitudinal steel bars to form a skeleton to improve the overall strength of the beam component.

[0036] This scheme adopts H-shaped steel 3 and concrete mixed casting. Compared with ordinary reinforced concrete structure, the bearing capacity and rigidity of the structure are significantly improved, and it is particularly suitable for large-span, heavy-load building structures. In addition, the steel-concrete structure also has very good ductility and energy dissipation capacity. Combined with several post-tensioned prestressed steel strands 4, it can achieve stress control in the tensile stress zone of the steel-concrete component, thereby significantly improving the working performance of the component during normal use. It has the dual advantages of prestressed concrete structure and steel-concrete structure, so that the strength of steel can be fully utilized, greatly improving the bearing capacity of the component, and using the good ductility of prestressed technology to improve the structure's ability to resist deformation and cracking;

[0037] Moreover, the hollow composite structural components adopted in this scheme optimize the structural deadweight to a certain extent, effectively save costs and improve the structural safety performance.

[0038] The above embodiments show and describe the basic principles and main features of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the present invention, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the invention claimed for protection.

Claims

1. A prestressed concrete box girder nested steel box girder composite structure, characterized in that: It comprises a concrete flange plate (1), a concrete web plate (2) and an H-shaped steel (3); The concrete flange plates (1) are arranged in parallel, and the concrete web plates (2) are arranged in parallel, and together form a box beam structure; H-shaped steel (3) is arranged inside the concrete flange plate (1) and the concrete web plate (2).

2. The prestressed concrete box girder nested steel box girder composite structure according to claim 1 is characterized in that: The webs of the H-shaped steel (3) in the concrete webs (2) on both sides are arranged parallel to the concrete webs (2).

3. The prestressed concrete box girder nested steel box girder composite structure according to claim 1 is characterized in that: The interior of the box beam structure enclosed by the concrete flange plate (1) and the concrete web plate (2) is a cavity.

4. The prestressed concrete box girder nested steel box girder composite structure according to claim 2 is characterized in that: Prestressed steel strands (4) are arranged in the concrete webs (2) on both sides; The prestressed steel strands (4) are arranged longitudinally parallel to the web of the H-shaped steel (3).

5. The prestressed concrete box girder nested steel box girder composite structure according to claim 4 is characterized in that: The prestressed steel strand (4) penetrates the concrete web (2) longitudinally and is arranged in a curved shape inside the concrete web (2).

6. The prestressed concrete box girder nested steel box girder composite structure according to claim 4, characterized in that: There are multiple prestressed steel strands (4).

7. The prestressed concrete box girder nested steel box girder composite structure according to claim 1, characterized in that: Longitudinal steel bars (5) are arranged inside the concrete flange plate (1); the longitudinal steel bars (5) are arranged on the upper and lower sides of the flange of the H-shaped steel (3) and are arranged parallel to the H-shaped steel (3).

8. The prestressed concrete box girder nested steel box girder composite structure according to claim 1, characterized in that: Longitudinal steel bars (5) are arranged inside the concrete web (2); the longitudinal steel bars (5) are arranged on the left and right sides of the web of the H-shaped steel (3) and are arranged parallel to the H-shaped steel (3).

9. The prestressed concrete box girder nested steel box girder composite structure according to claim 7 or 8, characterized in that: Circumferential stirrups (6) are also arranged inside the concrete flange plate (1) and the concrete web plate (2), and the circular stirrups (6) are arranged perpendicular to the H-shaped steel (3).

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