Novel box girder structure and construction method

Abstract

The invention provides a novel box girder structure and a construction method, and relates to the technical field of box girders, the novel box girder structure comprises a middle section and two girder sections, the two girder sections are arranged in the length direction of the middle section, the girder sections are suitable for being connected with bridge piers, and at least parts of the girder sections are made of steel plates. According to the novel box girder structure, at least part of the girder section is made of the steel plates, during construction of the girder section, the steel bar binding work can be reduced, interference of components such as embedded parts, prestressed tendons and anchor bearing plates during installation is avoided, the construction efficiency of the girder section is improved, meanwhile, the steel plates can replace part of the outer formworks while achieving the stress effect, and the construction cost is reduced. The building and dismantling workload of the outer formwork is reduced, the construction efficiency of the beam section is further improved, the using amount of beam section steel bars is reduced due to the use of the steel plates, the section size can be optimized, and intelligent building is facilitated.

Description

Technical Field

[0001] This invention relates to the field of box girder technology, and more specifically, to a novel box girder structure and construction method. Background Technology

[0002] Box girders, a common structural form in bridge engineering, experience complex stresses, bearing significant shear forces and localized stress concentrations. To improve the load-bearing capacity of these girder segments, traditional designs often employ thickening of the cross-section, directly resulting in complex structures and dense reinforcement. The reinforcement bars in these segments are not only numerous but also closely spaced, requiring precise arrangement within a limited space to ensure each bar fulfills its intended function. This arrangement process considers not only load-bearing performance but also the position of individual bars, spacing, overlap, and intersections, while simultaneously coordinating the relationship between the reinforcement bars and embedded parts, prestressing tendons, anchor plates, and other components. Under these multiple constraints, the reinforcement bars in the girder segments often exhibit diverse spacing and forms, increasing the construction difficulty of these sections and consequently leading to lower construction efficiency for box girders. Summary of the Invention

[0003] The purpose of this invention is to provide a novel box girder structure and construction method to improve the aforementioned problems. To achieve this objective, the technical solution adopted by this invention is as follows: In a first aspect, this application provides a novel box girder structure, comprising: a middle section; beam segments, wherein the beam segments are configured as two segments disposed along the length of the middle section, the beam segments are adapted to be connected to bridge piers, and at least a portion of the beam segments are made of steel plates.

[0004] Secondly, this application provides a construction method applicable to the novel box girder structure described in the first aspect, comprising: erecting an outer formwork and the steel plate, the outer formwork and the steel plate jointly constructing a first space corresponding to the intermediate section and a second space corresponding to the beam segment; setting a reinforcing mesh in the first space and the second space respectively, at least a portion of the reinforcing mesh in the second space extending into the first space; erecting an inner formwork in the first space and the second space, the inner formwork being located on the side of the reinforcing mesh away from the outer formwork and the steel plate; selectively replacing the inner formwork in the second space with an inner steel plate as needed; and pouring concrete in the first space and the second space.

[0005] The beneficial effects of this invention are as follows: At least a portion of the beam segment of the novel box girder structure of this invention is made of steel plate. Compared with traditional beam segment structures, the beam segment of this application can reduce the work of reinforcing bar binding during construction and avoid interference between embedded parts, prestressing tendons, anchor plates and other components during installation, thereby improving the construction efficiency of the beam segment. At the same time, the steel plate can replace part of the external formwork while playing a load-bearing role, reducing the workload of erecting and dismantling the external formwork, further improving the construction efficiency of the beam segment. Moreover, the setting of steel plate can reduce the thickness of the beam segment while ensuring the structural strength of the beam segment, thereby reducing the volume of the box girder structure and the amount of concrete used. Furthermore, since at least a portion of the beam segment is made of steel plate, the structure of the beam segment is simplified, the number of reinforcing bars in the beam segment is reduced, the excessively high requirements for the accuracy of the reinforcing bar arrangement are lowered, and intelligent binding of the beam segment reinforcing bars becomes possible, improving the degree of automation and efficiency of construction.

[0006] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0007] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a longitudinal elevation view of the novel box girder structure of the present invention; Figure 2 This is a partial sectional view of the novel box girder structure of the present invention; Figure 3 This is a cross-sectional view of the beam segment of the present invention; Figure 4 This is a partial sectional view of the beam segment of the present invention.

[0009] Marked in the image: 10. Intermediate section; 21. Load-bearing part; 22. Support part; 221. Bottom steel plate; 222. Side steel plate; 223. Enclosure plate; 224. First shear connector; 225. Second shear connector; 226. Embedded part; 23. Prestressed tendon; 24. Reinforcing steel mesh; 25. Transition section; 26. Beam end section. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0011] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0012] Example 1: like Figures 1-4 As shown, this embodiment provides a novel box girder structure, including: an intermediate section 10 and beam segments. The beam segments are constructed as two segments disposed along the length of the intermediate section 10. The beam segments are adapted to be connected to bridge piers, and at least a portion of the beam segments are made of steel plates.

[0013] In some embodiments, the intermediate section 10 is a reinforced concrete structure, with two beam segments symmetrically arranged along the length of the intermediate section 10. The two beam segments are connected to the piers, and at least a portion of the beam segments is made of steel plates.

[0014] Box girders, a common structural form in bridge engineering, experience complex stresses, bearing significant shear forces and localized stress concentrations. To improve the load-bearing capacity of these girder segments, traditional designs often employ thickening of the cross-section, directly resulting in complex structures and dense reinforcement. The reinforcement bars in these segments are not only numerous but also closely spaced, requiring precise arrangement within a limited space to ensure each bar fulfills its intended function. During this arrangement, in addition to considering load-bearing performance, the position of individual bars must be taken into account, along with spacing, overlap, and intersections between bars. Furthermore, the relationship between the reinforcement bars and embedded parts, prestressing tendons, anchor plates, and other components must be coordinated. Under these multiple constraints, the reinforcement bars in the girder segments often exhibit diverse spacing and forms, increasing the construction difficulty and demanding high precision.

[0015] In the novel box girder structure of this application, at least a portion of the beam segment is made of steel plate, i.e., the beam segment is a steel plate concrete structure. Compared with traditional reinforced concrete structures, this application uses steel plates to replace the steel reinforcement components in traditional beam segments, reducing on-site processes such as binding and improving construction efficiency. Simultaneously, this application, through the aforementioned arrangement, eliminates interference problems during the installation of components such as embedded parts 226, prestressing tendons 23, and anchor plates, making the installation of these components smoother and further improving construction efficiency.

[0016] It is worth mentioning that steel plates have higher strength than steel reinforcement components. Therefore, the thickened part of the beam segment in this application is smaller in size than the thickened part of the traditional beam segment, which reduces the volume of the box girder structure and the amount of concrete used.

[0017] Of course, steel plates can be prefabricated in factories to achieve standardized production, improve the quality and precision of components, and during on-site construction, the installation of steel plates is simpler than traditional steel bar binding, which can shorten the construction cycle and improve construction efficiency. At the same time, steel plates have good machinability and can be processed into various shapes according to design requirements to meet the needs of different bridge structures.

[0018] In some embodiments, the steel plate can be disposed within the concrete structure, thereby replacing the steel reinforcement components in the traditional beam segment; in other embodiments, the steel plate can cover the periphery of the concrete structure, thereby not only forming a combined load-bearing system with the concrete structure, but also serving as an external formwork during concrete pouring, reducing the workload of external formwork erection and demolding during concrete pouring, and further shortening the construction cycle.

[0019] It is worth mentioning that, since at least part of the beam segment is made of steel plate, the structure of the beam segment is simplified, the number of steel bars in the beam segment is reduced, the excessively high requirements for the accuracy of steel bar arrangement are lowered, intelligent binding of the beam segment steel bars becomes possible, the degree of automation and efficiency of construction is improved, and the cross-sectional dimensions of the beam segment can be optimized.

[0020] According to the novel box girder structure of the present invention, at least a portion of its beam segment is made of steel plate. Compared with the traditional beam segment structure, the beam segment of this application can reduce the work of reinforcing bar binding during construction and avoid interference between components such as embedded parts 226, prestressing tendons 23, and anchor plates during installation, thereby improving the construction efficiency of the beam segment. At the same time, the steel plate can replace part of the external formwork while playing a load-bearing role, reducing the workload of erecting and dismantling the external formwork and further improving the construction efficiency of the beam segment. Moreover, the setting of steel plate can reduce the thickness of the beam segment while ensuring the structural strength of the beam segment, thereby reducing the volume of the box girder structure and the amount of concrete used.

[0021] It is worth mentioning that, since the present invention replaces some of the steel reinforcement components of the traditional beam segment with steel plates, the structure of the steel reinforcement components of the beam segment of the present application is simpler, thereby enabling the beam segment of the present application to be constructed using intelligent construction methods such as robotic arms (the structure of the steel reinforcement components of the traditional beam segment is complex, and robotic arms and other methods cannot achieve precise construction, and can only rely on manual tying of steel reinforcement, etc.).

[0022] According to some embodiments of the present invention, the beam segment includes a load-bearing part 21 and a support part 22. The load-bearing part 21 is disposed on top of the support part 22. The vertical projection of the support part 22 is located inside the load-bearing part 21. The load-bearing part 21 is a reinforced concrete structure. At least a portion of the support part 22 is made of steel plate. The support part 22 is connected to the bridge pier.

[0023] In some embodiments, the beam segment includes a load-bearing portion 21 and a support portion 22, with the support portion 22 disposed at the bottom of the load-bearing portion 21 to improve the structural strength of the load-bearing portion 21. In conventional beam segments, both the support portion 22 and the load-bearing portion 21 are reinforced concrete structures. The steel reinforcement components within the support portion 22 lead to a more complex layout of the steel reinforcement components in the beam segment, resulting in low construction efficiency.

[0024] In this application, the load-bearing part 21 is a reinforced concrete structure, and the support part 22 includes a steel plate and concrete. The steel plate can replace the steel reinforcement components in the traditional support part 22, thereby making the structure of the steel reinforcement components of the beam segment simpler and improving the construction efficiency of the beam segment.

[0025] In some embodiments, the load-bearing portion 21 of the beam segment is a first load-bearing portion, the support portion 22 of the beam segment is a first support portion, and the intermediate segment 10 includes a second load-bearing portion and a second support portion, wherein the second support portion is not connected to the pier.

[0026] According to some embodiments of the present invention, the support portion 22 includes a bottom steel plate 221 and a side steel plate 222 connected to each other. The bottom steel plate 221 is adapted to be connected to the pier. The bottom steel plate 221 and the side steel plate 222 together define a top-open casting groove adapted for pouring concrete.

[0027] In some embodiments, the support portion 22 includes a bottom steel plate 221 and side steel plates 222. The bottom steel plate 221 is adapted to be connected to the pier. A plurality of side steel plates 222 are arranged around the outer periphery of the bottom steel plate 221 and are connected in sequence. Thus, a top-open casting groove is defined between the bottom steel plate 221 and the plurality of side steel plates 222. The casting groove is adapted to be used for pouring concrete. After the concrete solidifies, it together with the bottom steel plate 221 and the plurality of side steel plates 222 to form the support portion 22.

[0028] Understandably, the installation of the bottom steel plate 221 and multiple side steel plates 222 can avoid the need to erect external formwork for pouring concrete for the support part 22, thereby reducing the workload of erecting and dismantling external formwork and improving the construction efficiency of the beam segment.

[0029] It is worth mentioning that during the construction of the beam segment, the bottom steel plate 221 is first connected to the pier, and then multiple side steel plates 222 are connected to the bottom steel plate 221 respectively. Next, the outer formwork is erected to connect the outer formwork and the multiple side steel plates 222. After the concrete in the pouring groove defined between the bottom steel plate 221 and the multiple side steel plates 222 solidifies, it forms the concrete structure of the support part 22. A forming space is formed inside the outer formwork. After the concrete in the forming space solidifies, it forms the load-bearing part 21 together with the steel reinforcement components.

[0030] In some embodiments, the bottom steel plate 221 and the side steel plate 222 may be integrally formed; or the bottom steel plate 221 and the side steel plate 222 may be welded to each other or connected by fasteners, which is not limited here.

[0031] According to some embodiments of the present invention, the beam segment further includes a plurality of inner steel plates; wherein the plurality of inner steel plates are disposed in the casting groove and are adapted to replace the inner formwork when pouring concrete; or the plurality of inner steel plates are sequentially connected to a ring-shaped enclosure 223, the enclosure 223 being disposed in the casting groove, and the outer peripheral wall of the enclosure 223 and the inner peripheral wall of the casting groove defining a casting space suitable for pouring concrete.

[0032] Understandably, the inner formwork can be made entirely of wood or steel, or it can be replaced by inner steel plates as needed.

[0033] Specifically, in some embodiments, multiple inner steel plates are provided in the pouring trough. These inner steel plates are suitable for replacing the inner formwork when pouring concrete. Thus, the above arrangement can reduce the workload of erecting the inner formwork, while the inner steel plates can also improve the structural strength of the new box girder structure.

[0034] In other embodiments, an annular retaining plate 223 is provided within the casting trench. The retaining plate 223 is composed of multiple connected inner steel plates, which possess high strength and rigidity. When concrete is poured into the casting space between the retaining plate 223 and the inner wall of the casting trench, the retaining plate 223 restrains the concrete, limiting its deformation under stress, thereby improving the compressive strength and crack resistance of the concrete structure. Simultaneously, the concrete filling around the retaining plate 223 provides lateral support, preventing buckling instability. Both components work synergistically to enhance the overall structural strength of the beam segment. It is worth noting that the retaining plate 223 can also reduce the amount of concrete used and lighten the overall weight of the beam segment.

[0035] It should be noted that the enclosure 223 can replace part of the inner template, or the enclosure 223 can replace all of the inner template; there are no restrictions here.

[0036] It is worth mentioning that the combined structure formed by the retaining plate 223 and the concrete has higher strength and stiffness. Specifically, the restraining effect of the retaining plate 223 reduces the generation and development of concrete cracks and improves the durability of the concrete. At the same time, the tensile properties of the steel plate and the compressive properties of the concrete complement each other, enabling the beam segment to better withstand various complex loads and extend the service life of the structure.

[0037] According to some embodiments of the present invention, the bottom steel plate 221, the side steel plate 222 and the inner steel plate are all provided with a first shear connector 224 extending toward the casting space, and the inner steel plate is also provided with a second shear connector 225 extending to connect with the bearing part 21.

[0038] In some embodiments, the bottom steel plate 221, the side steel plate 222, and the inner steel plate are all provided with a first shear connector 224. The first shear connector 224 extends toward the pouring space. After the concrete is poured into the pouring space, the first shear connector 224 can be embedded in the concrete to enhance the connection strength between the steel plate and the concrete. The inner steel plate is also provided with a second shear connector 225. The second shear connector 225 extends to connect with the bearing part 21 to strengthen the connection between the enclosure 223 and the bearing part 21, thereby improving the connection strength between the bearing part 21 and the support part 22.

[0039] It is understandable that during the structural stress process, shear force will be generated between the steel plate and the concrete. The first shear connector 224 and the second shear connector 225 can effectively transfer the shear force and prevent relative slippage between the steel plate and the concrete.

[0040] Furthermore, since the first shear connector 224 is embedded in the concrete, when the steel plate is subjected to tension or compression, the force is transferred to the surrounding concrete through the first shear connector 224, so that the steel plate and the concrete can bear the load together as a whole. The second shear connector 225 transfers the force on the bearing part 21 to the inner steel plate, ensuring smooth force transmission between the various parts of the structure.

[0041] In some embodiments, the first shear connector 224 and the second shear connector 225 may be studs; of course, the bottom steel plate 221, the side steel plate 222 and the inner steel plate may also be surface treated to form the first shear connector 224 or the second shear connector 225, which is not limited here.

[0042] According to some embodiments of the present invention, the bottom steel plate 221 is provided with embedded parts 226 suitable for connection with the pier and for preventing beam collapse, at least a portion of the embedded parts 226 being located in the casting groove.

[0043] In some embodiments, the embedded part 226 is partially located within the casting groove. When concrete is poured into the casting groove, the concrete encapsulates the embedded part 226. During the hardening process, the concrete mechanically interlocks with the surface of the embedded part 226. This interlocking force ensures a tight bond between the embedded part 226 and the concrete. When the bottom steel plate 221 is connected to the pier through the embedded part 226, the load borne by the bottom steel plate 221 from the beam segment can be more effectively transferred to the pier. When the bottom steel plate 221 is under stress, the stress is transferred to the pier through the embedded part 226. Since the embedded part 226 is partially encapsulated by concrete, the concrete can disperse the stress, i.e., the concentrated stress transferred from the bottom steel plate 221 is dispersed into a larger volume of concrete. This avoids excessive local stress that could lead to damage to the embedded part 226 or the connection point of the pier, thus improving the load-bearing capacity and durability of the connection point.

[0044] It is worth mentioning that during the processing of the bottom steel plate 221, the embedded parts 226 (such as the support embedded parts 226, the anti-fall beam embedded parts 226, etc.) can be integrated in the factory to ensure positioning accuracy; if not integrated, the embedded parts 226 can be connected to the bottom steel plate 221 during on-site construction. Preferably, the embedded parts 226 such as supports and anti-fall beams can be connected to the bottom steel plate 221 by welding or bolts, which can optimize the anchoring measures in traditional reinforced concrete and simplify the construction process.

[0045] According to some embodiments of the present invention, the novel box girder structure further includes a plurality of prestressing tendons 23, all of which are located in the casting groove and are distributed at intervals along the circumference of the casting groove, with one end of the plurality of prestressing tendons 23 on the same side extending to the middle section 10 respectively.

[0046] In some embodiments, after the concrete is poured and hardened, the prestressing tendons 23 are tensioned to generate a prestress on the surrounding concrete. This prestress can offset part of the tensile stress on the structure during use, thereby delaying the appearance and development of concrete cracks and improving the crack resistance of the new box girder structure.

[0047] Understandably, multiple prestressing tendons 23 are distributed at intervals along the circumference of the casting trench. These multiple prestressing tendons 23 can distribute the prestress evenly or according to design requirements into the concrete in the casting trench. When the structure is subjected to load, the prestressing tendons 23 transfer the prestress to the concrete through the bonding effect with the concrete, so that the concrete is in a state of compression. At the same time, it balances the tensile stress generated by the load, improves the stress distribution of the structure, and enhances the overall load-bearing capacity of the structure.

[0048] It is worth mentioning that one end of the prestressing tendon 23 extends to the middle section 10, so that the prestressing tendon 23 can form a whole working together with the middle section 10 of the box girder and other structural components. Under the action of load, the middle section 10 transfers the load to the prestressing tendon 23. The prestressing tendon 23 distributes the load to the entire box girder structure through its own prestressing and interaction with the concrete, thereby improving the stability and reliability of the structure.

[0049] According to some embodiments of the present invention, a plurality of reinforcing steel meshes 24 are provided in the casting trough, and one end of some of the reinforcing steel meshes 24 extends to the middle section 10 on the same side.

[0050] In some embodiments, a plurality of reinforcing steel meshes 24 are provided in the casting trench. The reinforcing steel meshes 24 are formed by welding or binding crisscrossing steel bars. The plurality of reinforcing steel meshes 24 are used to enhance the strength and crack resistance of the concrete, thereby improving the structural strength of the support 22. One end of each of the reinforcing steel meshes 24 extends to the intermediate section 10, that is, the intermediate section 10 and the beam section can be connected by the reinforcing steel meshes 24 to improve the connection strength between the beam section and the intermediate section 10, thereby improving the connection stability between the beam section and the intermediate section 10, and thus facilitating better force transmission and dispersion.

[0051] According to some embodiments of the present invention, the beam segment includes a variation segment 25, which is disposed on both sides of the intermediate segment 10 along its length. A beam end segment 26 is disposed on the side of the variation segment 25 away from the intermediate segment 10. The beam end segment 26 is adapted to be connected to a pier. At least a portion of the variation segment 25 and / or the beam end segment 26 is made of steel plate.

[0052] In some embodiments, the transition segment 25 is disposed on both sides of the intermediate segment 10. The main function of the transition segment 25 is to realize the transition of the structural form. The transition segment 25, through changes in shape and size, enables the internal force to be smoothly transmitted between the intermediate segment 10 and the beam end segment 26, avoiding stress concentration caused by abrupt structural changes.

[0053] It is understood that at least a portion of the variation segment 25 may be made of steel plate; at least a portion of the beam end segment 26 may be made of steel plate; or at least a portion of the variation segment 25 may be made of steel plate, and at least a portion of the beam end segment 26 may be made of steel plate, without limitation.

[0054] Example 2: This invention provides a construction method applicable to the novel box girder structure described in Example 1, comprising: Erect external formwork and steel plates. The external formwork and steel plates together construct the first space corresponding to the middle section 10 and the second space corresponding to the beam segment.

[0055] In some embodiments, the outer formwork and steel plates are erected first. The outer formwork is made of materials with certain strength and rigidity, such as wooden or steel formwork. The combination of the outer formwork and steel plates forms a concrete space with an open top, providing a foundation for the subsequent binding of the reinforcing mesh. The concrete space is divided into a first space corresponding to the intermediate section 10 and a second space corresponding to the beam segment.

[0056] Reinforcing meshes are installed in the first space and the second space respectively, with at least a portion of the reinforcing meshes in the second space extending into the first space.

[0057] In some embodiments, the binding of steel mesh is carried out in the first space (corresponding to the middle section 10) and the second space (corresponding to the beam section). The steel mesh is composed of crisscrossing steel bars, and multiple steel bars are fixed together by binding wire. At the same time, at least part of the steel mesh in the second space extends into the first space.

[0058] In other embodiments, the tied steel mesh is respectively placed in the first space and the second space.

[0059] Understandably, the role of the steel mesh is to enhance the strength and crack resistance of concrete. When concrete is subjected to tension or compression, the steel bars can bear part of the tensile stress and work together with the concrete. The steel mesh in the second space extends into the first space to realize the internal force transfer between the beam segment and the intermediate segment 10, so that the entire new box girder structure forms an organic whole and jointly bears the external force.

[0060] Inner formwork is erected within the first and second spaces, located on the side of the reinforcing mesh facing away from the outer formwork and steel plate. It is understood that the space between the inner formwork and the outer formwork and steel plate is used for pouring concrete, and the space within the inner formwork is used to reduce the amount of concrete poured.

[0061] The inner formwork in the second space can be selectively replaced with an inner steel plate as needed.

[0062] It is understandable that by sequentially erecting outer formwork and steel plates, setting up steel mesh in the first and second spaces, erecting inner formwork in the first and second spaces, and selectively replacing the inner formwork in the second space with inner steel plates as needed, the erection work of the new box girder structure becomes clearer and more hierarchical, and the erection efficiency of the new box girder structure can be improved (if the enclosure 223 is set up in the second space first, it will be difficult to lay out the steel mesh in the second space, reducing the erection efficiency of the new box girder structure).

[0063] In some embodiments, all the inner templates in the second space may be replaced with inner steel plates; some of the inner templates in the second space may be replaced with inner steel plates; or the inner templates in the second space may not be replaced, and no limitation is made here. When at least some of the inner templates in the second space are replaced with inner steel plates, adjacent inner steel plates may be connected in sequence to form a surrounding panel 223.

[0064] Concrete was poured in the first and second spaces.

[0065] Understandably, after the outer formwork and steel plate are erected, the steel mesh is set up, and the enclosure is set up, concrete is poured into the first and second spaces. The concrete is made of cement, sand, stone, water and admixtures in a certain proportion. After mixing, transportation and other processes, it is injected into the concrete space using appropriate pouring methods (such as layered pouring, segmented pouring, etc.).

[0066] After being poured, concrete undergoes a hydration reaction, gradually hardening and encapsulating the reinforcing mesh and steel plate. Finally, the concrete, reinforcing mesh, and steel plate form a solid whole. The reinforcing mesh and steel plate provide additional strength and restraint to the concrete, while the concrete protects the reinforcing mesh and steel plate, preventing them from rusting and being damaged.

[0067] It is worth mentioning that when the concrete was poured into the second space, it was poured between the steel plate and the enclosure 223 and on top of the enclosure 223.

[0068] Therefore, by having the steel plate and the outer formwork jointly form a first space and a second space for pouring concrete, this application enables the steel plate to not only improve the structural strength of the beam segment, but also to replace part of the outer formwork, reducing the workload of erecting and dismantling the outer formwork and improving the construction efficiency of the new box girder structure. At the same time, the use of the steel plate reduces the use of steel reinforcement components in the beam segment, reduces the work of steel reinforcement binding, and avoids interference between components such as embedded parts 226, prestressed tendons 23, and anchor plates during installation, thereby improving the construction efficiency of the beam segment and further improving the construction efficiency of the new box girder structure.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A novel box girder structure, characterized by, The utility model relates to a bridge beam, comprising: a middle section (10); a beam section configured to be arranged on both sides of the middle section (10) in the length direction, the beam section being adapted to be connected to a pier, at least part of the beam section being made of a steel plate.

2. The novel box girder structure according to claim 1, wherein The beam section comprises a bearing part (21) and a support part (22), the bearing part (21) being arranged on top of the support part (22), a projection of the support part (22) in the vertical direction being located within the bearing part (21), the bearing part (21) being a reinforced concrete structure, at least part of the support part (22) being made of a steel plate, and the support part (22) being connected to the pier.

3. The novel box girder structure according to claim 2, wherein The support part (22) comprises a bottom steel plate (221) and a side steel plate (222) connected to each other, the bottom steel plate (221) being adapted to be connected to the pier, and the bottom steel plate (221) and the side steel plate (222) together defining a pouring channel with an open top, the pouring channel being adapted to pour concrete.

4. The novel box girder structure according to claim 3, characterized in that, The beam section further comprises a plurality of inner steel plates; wherein the plurality of inner steel plates are arranged in the pouring channel and are adapted to replace inner formworks when pouring concrete; or the plurality of inner steel plates are sequentially connected to form a ring-shaped enclosing plate (223), the enclosing plate (223) being arranged in the pouring channel, and a pouring space adapted to pour concrete being defined between the outer peripheral wall of the enclosing plate (223) and the inner peripheral wall of the pouring channel.

5. The novel box girder structure according to claim 4, characterized in that, The bottom steel plate (221), the side steel plate (222), and the inner steel plates are each provided with a first shear connector (224) extending towards the pouring space, and the inner steel plates are further provided with a second shear connector (225) extending to be connected to the bearing part (21).

6. The novel box girder structure according to claim 3, wherein The bottom steel plate (221) is provided with a pre-embedded part (226) adapted to be connected to the pier and to prevent beam falling, at least part of the pre-embedded part (226) being located in the pouring channel.

7. The novel box girder structure according to claim 3, wherein A plurality of prestressed tendons (23) are further included, the plurality of prestressed tendons (23) each being located in the pouring channel and being distributed along the circumference of the pouring channel, and the same side ends of the plurality of prestressed tendons (23) each extending to the middle section (10).

8. The novel box girder structure according to claim 3, wherein A plurality of reinforcing steel mesh (24) are arranged in the pouring channel, and the same side ends of part of the reinforcing steel mesh (24) each extend to the middle section (10).

9. The novel box girder structure according to claim 1, wherein The beam section comprises a change section (25) arranged on both sides of the middle section (10) in the length direction, and a beam end section (26) is arranged on the side of the change section (25) away from the middle section (10), the beam end section (26) being adapted to be connected to the pier, and at least part of the change section (25) and / or the beam end section (26) being made of a steel plate.

10. A construction method suitable for the new box girder structure according to any one of claims 1-9, characterized in that, The utility model relates to a bridge beam, comprising: erecting an outer formwork and the steel plate, the outer formwork and the steel plate together defining a first space corresponding to the middle section (10) and a second space corresponding to the beam section; arranging steel mesh in the first space and the second space respectively, at least part of the steel mesh in the second space extending to the first space; erecting an inner formwork in the first space and the second space, the inner formwork being located on the side of the steel mesh away from the outer formwork and the steel plate; selectively replacing the inner formwork in the second space with an inner steel plate as needed; Concrete was poured in the first and second spaces.

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