Steel box girder

Abstract

The utility model provides a steel box girder, which relates to the technical field of bridge construction, and comprises a box body structure, the box body structure comprises a top plate, a bottom plate and two web plates, the top plate is arranged above the bottom plate, the top plate is parallel to the bottom plate, the upper ends of the two web plates are respectively connected to the left side and the right side of the top plate, and the two web plates are arranged on the bottom plate. The lower ends of the two web plates are connected to the left side and the right side of the bottom plate respectively, the top plate, the bottom plate and the two web plates define the box body structure, a cavity is formed in the box body structure, at least two partition plates are arranged on the inner circumferential wall of the cavity in the splicing direction at intervals, and the partition plates are of a frame type structure. The outer peripheral wall of the partition plate is connected with the inner peripheral wall of the cavity. By arranging the partition plates, the mechanical property of the steel box girder is changed, when the steel box girder bears an external load, the partition plates can improve the bending resistance and torsion resistance of the box body, and the partition plates can share and transmit part of the load, so that the stress of the whole box body is more uniform.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge building technical field, more particularly, relate to a kind of steel box girder. BACKGROUND

[0002] In modern bridge engineering, steel box girder is widely used as an important structure form due to its high strength, light weight, fast construction speed and easy maintenance. Steel box girder is usually spliced by multiple components to adapt to different span and load requirements. The existing steel box girder often adopts a simple box section, which is composed of a top plate, a bottom plate and two webs, forming a closed chamber to improve the overall stiffness and carrying capacity of the structure.

[0003] However, with the continuous progress of bridge engineering technology and the increasing demand for transportation, the single chamber structure limits the adaptability and carrying capacity of steel box girder under complex load conditions, especially in bridge parts that need to withstand large bending moment and torque. The existing box section cannot meet the design requirements. In addition, in order to improve the stiffness and stability of the steel box girder, the amount of material needs to be increased, which not only increases the engineering cost, but also may lead to an increase in construction difficulty. SUMMARY

[0004] The problem solved by the utility model is how to solve the uneven stress, stress concentration and deformation of steel box girder under complex load conditions, thereby improving its overall stiffness and stability.

[0005] To solve the above problems, the utility model provides a steel box girder, which includes a box structure, the box structure includes a top plate, a bottom plate and two webs, the top plate is above the bottom plate, the top plate is parallel to the bottom plate, the upper ends of the two webs are connected to the left and right sides of the top plate, the lower ends of the two webs are connected to the left and right sides of the bottom plate, the top plate, the bottom plate and the two webs form the box structure, a chamber is formed in the box structure, at least two partitions are provided on the inner wall of the chamber along the splicing direction, the partitions are in frame structure, and the outer wall of the partition is connected with the inner wall of the chamber.

[0006] Optionally, the plane of the web is perpendicular to the plane of the top plate or the bottom plate.

[0007] Optionally, the partition is a first partition, and the first partition includes a first frame body having a "hui" - shaped structure. The outer peripheral wall of the first frame body is connected to the inner peripheral wall of the chamber. The first frame body includes an upper cross - plate, a right vertical plate, a lower cross - plate, and a left vertical plate that are connected in sequence. A first connection point is provided at the middle position of the lower end of the upper cross - plate in the left - right direction. Second connection points and third connection points are respectively provided at the joints of the lower cross - plate with the right vertical plate and the left vertical plate. A first support rod is connected between the first connection point and the second connection point, and a second support rod is connected between the first connection point and the third connection point.

[0008] Optionally, the partition is a first partition or a second partition. The first partition and the second partition are alternately arranged at intervals in the splicing direction of the box body structure in the chamber, and the outer peripheral walls of the first partition and the second partition are both connected to the inner peripheral wall of the chamber. The first partition includes a first frame body having a "hui" - shaped structure. The outer peripheral wall of the first frame body is connected to the inner peripheral wall of the chamber. The first frame body includes an upper cross - plate, a right vertical plate, a lower cross - plate, and a left vertical plate that are connected in sequence. A first connection point is provided at the middle position of the lower end of the upper cross - plate in the left - right direction. Second connection points and third connection points are respectively provided at the joints of the lower cross - plate with the right vertical plate and the left vertical plate. A first support rod is connected between the first connection point and the second connection point, and a second support rod is connected between the first connection point and the third connection point. The second partition includes a second frame body having a "hui" - shaped structure.

[0009] Optionally, a plurality of first stiffening ribs are provided at intervals on the lower end surface of the top plate.

[0010] Optionally, a plurality of second stiffening ribs are provided at intervals on the lower end surfaces of both sides of the top plate in the left - right direction, and the second stiffening ribs are located on both sides of the plurality of first stiffening ribs.

[0011] Optionally, a plurality of third stiffening ribs are provided at intervals on the upper end surface of the bottom plate.

[0012] Optionally, a plurality of fourth stiffening ribs are provided at intervals on the side surface of the web plate close to the chamber.

[0013] Optionally, the plurality of box body structures are sequentially spliced, and one end of the top plate of the box body structure located at the two ends along the splicing direction is provided with a first transition section, the first transition section comprises a variable-height first stiffener and an equal-height second stiffener connected in sequence, the first stiffener is connected with one end of the top plate, the second stiffener is connected to the first stiffener away from the one end of the top plate, and the height of the first stiffener in the upward direction gradually increases from the one end close to the top plate to the one end away from the top plate, and the height of the second stiffener in the upward direction is consistent with the height of the one end of the first stiffener away from the top plate in the upward direction.

[0014] Optionally, one end of the bottom plate of the box body structure located at the two ends along the splicing direction is provided with a second transition section, and the second transition section comprises a variable-height third stiffener, the third stiffener is connected with one end of the bottom plate, and the height of the third stiffener in the upward direction gradually increases from the one end close to the bottom plate to the one end away from the bottom plate.

[0015] The beneficial effect of the steel box girder of the utility model is: the steel box girder can include a plurality of spliced box body structures, at least two frame type structure partition plates are arranged on the inner circumferential wall of the cavity of the steel box girder along the splicing direction, the outer circumferential wall of the partition plate is connected with the inner circumferential wall of the cavity, thereby forming a plurality of small cavities or partition areas in the cavity. The setting of the partition plate changes the mechanical properties of the steel box girder. When bearing external load, the partition plate can increase the bending and torsional resistance of the box body, and the partition plate can share and transfer part of the load, so that the stress of the whole box body is more uniform. At the same time, since the partition plates are frame type structures, they can reduce the weight while maintaining the structural rigidity, avoiding the increase of self weight and construction difficulty caused by the increase of materials.

[0016] The steel box girder of the utility model improves the adaptability and carrying capacity of the steel box girder under complex load conditions, especially in the bridge parts that need to bear large bending moment and torque, which can better meet the design requirements. The introduction of the partition plate changes the mechanical distribution of the box body, so that the stress of the box body is more reasonable, which can effectively reduce stress concentration and deformation, thereby improving the overall rigidity and stability of the steel box girder. Since the partition plates adopt frame type structure, compared with solid partition plates, they can reduce the weight while maintaining the structural rigidity, which is beneficial to reducing the engineering cost, reducing the construction difficulty and reducing the self weight of the bridge. Moreover, the setting of the partition plate will not affect the splicing and assembly of the box body, so it will not increase the construction difficulty. At the same time, since the partition plate divides the cavity into multiple small areas, it is also beneficial to the later maintenance and repair work. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The overall structure of an embodiment of the utility model is shown Figure 1 ;

[0018] Figure 2 The overall structure of one embodiment of the present application Figure 2 ;

[0019] Figure 3 The structure of the first partition plate of one embodiment of the present application

[0020] Figure 4 The structure of the second partition plate of one embodiment of the present application

[0021] Figure 5 The structure of the top plate of one embodiment of the present application Figure 1 ;

[0022] Figure 6 The structure of the bottom plate of one embodiment of the present application Figure 1 ;

[0023] Figure 7 The structure of the web of one embodiment of the present application

[0024] Figure 8 The structure of the top plate of one embodiment of the present application Figure 2 ;

[0025] Figure 9 The structure of the top plate of one embodiment of the present application Figure 2 .

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1, top plate; 11, first stiffening rib; 12, second stiffening rib; 13, first transition section; 131, first stiffening plate; 132, second stiffening plate; 2, bottom plate; 21, third stiffening rib; 22, second transition section; 3, web; 31, fourth stiffening rib; 4, partition plate; 41, first partition plate; 411, upper horizontal plate; 412, right vertical plate; 413, lower horizontal plate; 414, left vertical plate; 415, first connection point; 416, second connection point; 417, third connection point; 418, first support rod; 419, second support rod; 42, second partition plate; 5, box structure; 51, chamber. DETAILED DESCRIPTION

[0028] In order to make the above object, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be realized in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are only for illustrative purposes, and are not used to limit the protection scope of the present application.

[0029] The Z axis in the drawings represents the vertical direction, that is, the up-down position, and the positive direction of the Z axis represents the upper side, and the negative direction of the Z axis represents the lower side; the X axis in the drawings represents the horizontal direction, and is designated as the front-rear position, and the positive direction of the X axis represents the front side, and the negative direction of the X axis represents the rear side; the Y axis in the drawings represents the left-right position, and the positive direction of the Y axis represents the left side, and the negative direction of the Y axis represents the right side. It should be noted that the meanings of the aforementioned Z axis, Y axis and X axis are only for the convenience of describing the present application and simplifying the description, and are not indicative or suggestive of the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0030] The term "comprising" and its variants used in this document are open-ended, i.e., "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Related definitions of other terms will be given in the following description. It should be noted that the "first", "second", etc. concepts mentioned in the present application are only used to distinguish different devices, modules or units, and are not used to limit the functions performed by these devices, modules or units or their mutual dependency.

[0031] It should be noted that the modification of "one" or "multiple" mentioned in the present application is illustrative and not limiting, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0032] As Figure 1 , Figure 2As shown in the utility model embodiment, the steel box girder comprises a box structure 5, the box structure 5 comprises a top plate 1, a bottom plate 2 and two webs 3, the top plate 1 is located above the bottom plate 2, the top plate 1 is parallel to the bottom plate 2, the upper ends of the two webs 3 are connected to the left and right sides of the top plate 1 respectively, the lower ends of the two webs 3 are connected to the left and right sides of the bottom plate 2 respectively, the top plate 1, the bottom plate 2 and the two webs 3 enclose to form the box structure 5, a chamber 51 is formed in the box structure 5, at least two partition plates 4 are arranged on the inner circumferential wall of the chamber 51 along the splicing direction, the partition plate 4 is in a frame structure, and the outer circumferential wall of the partition plate 4 is connected with the inner circumferential wall of the chamber 51.

[0033] Specifically, the steel box girder is composed of a plurality of spliced box structures 5, and the splicing direction of the box structure 5 extends along the front-rear direction. Each box structure 5 comprises a top plate 1, a bottom plate 2 and two webs 3, which are collectively welded to enclose a closed chamber 51. In the chamber 51, at least two frame-type partition plates 4 are arranged along the splicing direction of the box structure 5, and the outer circumferential wall of the partition plate 4 is welded and connected with the inner circumferential wall of the chamber 51, thereby ensuring the integrity and stability of the structure. Through the arrangement of the partition plate 4, the originally single chamber 51 is divided into a plurality of small chambers 51 or partition areas, which can cooperate with each other to bear external loads when stressed, thereby improving the overall carrying capacity and anti-deformation ability of the steel box girder. The partition plate 4 adopts a frame structure, which not only ensures the strength of the partition plate 4, but also reduces the weight of the partition plate 4, thereby helping to reduce the self-weight of the bridge and the engineering cost.

[0034] In the embodiment, by arranging the partition plate in the chamber 51, the originally single chamber 51 is divided into a plurality of small closed areas, so that the steel box girder can more effectively distribute and transfer stress when bearing external loads, thereby improving its overall carrying capacity and anti-deformation ability. The arrangement of the partition plate increases the support points inside the steel box girder, so that the structure is more stable when stressed and is not easy to fail. The partition plate adopts a frame structure, which reduces the weight of the partition plate, thereby helping to reduce the self-weight of the bridge. At the same time, due to the arrangement of the partition plate, the carrying capacity of the steel box girder is improved, so that the amount of material can be reduced under the same load condition, thereby reducing the engineering cost. Moreover, the frame-type partition plate makes the chamber 51 have good permeability, which is convenient for arranging subsequent pipeline equipment inside, and is also convenient for maintenance and replacement in the later period.

[0035] Optionally, as shown in Figure 3 、 Figure 2 the plane where the web 3 is located is perpendicular to the plane where the top plate 1 or the bottom plate 2 is located.

[0036] Specifically, the perpendicular relationship between the web 3 and the top plate 1 and the bottom plate 2 helps to form a more robust box-shaped cross-section. When the bridge bears loads, it can more effectively distribute and resist stresses, preventing the structure from deforming or being damaged. At the same time, the perpendicular relationship between the web 3 and the top plate 1 and the bottom plate 2 also simplifies the construction process, making the connection between components simpler and more reliable, facilitating later maintenance and inspection, and reducing the maintenance cost.

[0037] In this optional embodiment, the perpendicular relationship between the web 3 and the top plate 1 and the bottom plate 2 helps to form a more reasonable mechanical transmission path, enabling the steel box girder to more effectively distribute and resist stresses when bearing loads, thereby improving its bearing capacity, enhancing the overall stiffness and stability of the steel box girder structure, and making it safer and more reliable when bearing external loads.

[0038] Optionally, as Figure 3 shown, the partition is the first partition 41. The first partition 41 includes a first frame body in a "hui" - shaped structure, and the outer peripheral wall of the first frame body is connected to the inner peripheral wall of the chamber 51; the first frame body includes an upper cross plate 411, a right vertical plate 412, a lower cross plate 413, and a left vertical plate 414 connected in sequence. At the middle position of the lower end of the upper cross plate 411 along the left - right direction, there is a first connection point 415. At the joints of the lower cross plate 413 with the right vertical plate 412 and the left vertical plate 414, there are a second connection point 416 and a third connection point 417 respectively. A first support rod 418 is connected between the first connection point 415 and the second connection point 416, and a second support rod 419 is connected between the first connection point 415 and the third connection point 417.

[0039] Specifically, the first partition 41 is composed of the first frame body. The frame body of the first frame body is in a "hui" - shaped structure, and its outer peripheral wall is welded to the inner peripheral wall of the chamber 51. The first frame body includes an upper cross plate 411, a right vertical plate 412, a lower cross plate 413, and a left vertical plate 414 connected in sequence, forming a closed "hui" - shaped space. At the middle position of the lower end of the upper cross plate 411 along the left - right direction, there is a first connection point 415. At the joints of the lower cross plate 413 with the right vertical plate 412 and the left vertical plate 414, there are a second connection point 416 and a third connection point 417 respectively. To enhance the stiffness and stability of the partition, a first support rod 418 is welded between the first connection point 415 and the second connection point 416, and a second support rod 419 is welded between the first connection point 415 and the third connection point 417. The two support rods form a triangular support structure inside the partition, effectively improving the bearing capacity of the partition. When the steel box girder bears external loads, the partition and the internal support structure can effectively transmit and disperse stresses, preventing local damage to the structure. At the same time, the "hui" - shaped structure of the partition also helps to improve the overall stiffness and torsional resistance of the box - shaped cross - section.

[0040] In this optional embodiment, by adopting the first frame body with a "hui" - shaped structure and arranging support rods inside it, the stiffness and stability of the partition are significantly enhanced, which helps to improve the overall bearing capacity and anti - deformation ability of the steel box girder. The "hui" - shaped structure of the partition and the support rods inside form a more reasonable mechanical transmission path. When the bridge bears loads, these structures can effectively disperse and resist stresses, preventing the structure from being damaged.

[0041] Optionally, as Figure 4 , Figure 5 , Figure 5 shown, the partition is the first partition 41 or the second partition 42. The first partition 41 and the second partition 42 are arranged at intervals and alternately along the splicing direction of the box - body structure 5 in the chamber 51. The outer peripheral walls of the first partition 41 and the second partition 42 are both connected to the inner peripheral wall of the chamber 51. The first partition 41 includes a first frame body with a "hui" - shaped structure. The outer peripheral wall of the first frame body is connected to the inner peripheral wall of the chamber 51. The first frame body includes an upper cross - plate 411, a right vertical plate 412, a lower cross - plate 413, and a left vertical plate 414 that are connected in sequence. At the middle position of the lower end of the upper cross - plate 411 along the left - right direction, there is a first connection point 415. At the joints of the lower cross - plate 413 with the right vertical plate 412 and the left vertical plate 414, there are a second connection point 416 and a third connection point 417 respectively. A first support rod 418 is connected between the first connection point 415 and the second connection point 416, and a second support rod 419 is connected between the first connection point 415 and the third connection point 4l7. The second partition 42 includes a second frame body with a "hui" - shaped structure.

[0042] Specifically, the first partition 41 and the second partition 42 are arranged at intervals and alternately along the splicing direction in the chamber 51. The first partition 41 includes a first frame body with a "hui" - shaped structure, which is composed of an upper cross - plate 411, a right vertical plate 412, a lower cross - plate 413, and a left vertical plate 414 that are connected in sequence. The outer peripheral wall of the first frame body is welded to the inner peripheral wall of the chamber 51, ensuring the integrity and stability of the structure. At the middle position of the lower end of the upper cross - plate 411 along the left - right direction, there is a first connection point 415. At the joints of the lower cross - plate 413 with the right vertical plate 412 and the left vertical plate 414, there are a second connection point 416 and a third connection point 417 respectively. To enhance the stiffness and stability of the partition, a first support rod 418 is welded between the first connection point 415 and the second connection point 416, and a second support rod 419 is welded between the first connection point 415 and the third connection point 417. The two support rods form a triangular support structure inside the partition, effectively improving the bearing capacity of the partition. The second partition 42 also adopts a second frame body with a "hui" - shaped structure, but the setting of the support rods is omitted. The first partition 41 and the second partition 42 are arranged alternately, which ensures the stability of the box - body structure 5 while saving materials and reducing the manufacturing cost.

[0043] In this optional embodiment, when the steel box girder is subjected to external loads, the first diaphragm 41 and the second diaphragm 42, along with their internal support structures, can effectively transfer and disperse stress, preventing localized structural damage. Simultaneously, the "U"-shaped structure of the diaphragms also helps improve the overall stiffness and torsional resistance of the box section. By alternately arranging the first diaphragm 41 and the second diaphragm 42, and forming an effective support structure within the first diaphragm 41, the overall stiffness of the steel box girder is significantly improved, helping to maintain structural stability and safety under external loads. Furthermore, it simplifies the support structure of the second diaphragm 42, saves materials, and reduces project costs.

[0044] Optionally, such as Figure 6 As shown, the lower end face of the top plate 1 is provided with a plurality of first stiffening ribs 11 at intervals.

[0045] Specifically, the first stiffening ribs 11 are evenly distributed on the lower end face of the top plate 1 at predetermined intervals and are firmly connected to the top plate 1. The shape and size of the first stiffening ribs 11 can be designed according to actual needs to ensure that the stiffness of the top plate 1 is effectively enhanced. For example, the first stiffening ribs 11 can adopt T-shape, I-shape, U-shape, or other effective cross-sectional shapes to increase their bending and shear resistance. During construction, the first stiffening ribs 11 can be welded or bolted together with the top plate 1 to ensure a firm connection. At the same time, the arrangement and quantity of the first stiffening ribs 11 also need to be optimized according to specific load conditions and design requirements to achieve the best mechanical effect.

[0046] In this optional embodiment, the first stiffening rib 11, as an additional supporting structure, can significantly improve the bending stiffness and shear stiffness of the top plate 1. When the top plate 1 is subjected to external loads, the first stiffening rib 11 can effectively resist deformation and maintain the stability of the structure. The arrangement of the first stiffening rib 11 can also distribute the stress on the top plate 1 more evenly throughout the entire structure, helping to prevent structural failure caused by local stress concentration and improving the load-bearing capacity of the entire steel box girder. By adding the first stiffening rib 11, the structural strength of the top plate 1 is improved, thereby better resisting the effects of fatigue failure and corrosion, and extending the service life of the steel box girder.

[0047] Optionally, such as Figure 7 As shown, the lower end surfaces of the top plate 1 on both sides in the left and right directions are provided with a plurality of second stiffening ribs 12 at intervals, and the second stiffening ribs 12 are located on both sides of a plurality of first stiffening ribs 11.

[0048] Specifically, the central region of the lower end surface of the top plate 1 is provided with a plurality of first stiffening ribs 11. Meanwhile, in order to further enhance the load-bearing capacity of the top plate 1, a plurality of second stiffening ribs 12 are arranged at intervals on the left and right sides of the lower end surface of the top plate 1. The second stiffening ribs 12 are arranged along the edges of the top plate 1, providing additional support and stiffness to the top plate 1. The first stiffening ribs 11 and the second stiffening ribs 12 cooperate to form a stiffening rib system on the lower end surface of the top plate 1, further enhancing the overall load-bearing capacity of the top plate 1, enabling it to better withstand loads from above and below. The second stiffening ribs 12 can adopt T-shaped, I-shaped, U-shaped, or other effective cross-sectional shapes. The second stiffening ribs 12 can be welded or bolted with the top plate 1 to ensure firm connection.

[0049] In this optional embodiment, the layered arrangement of the first stiffening ribs 11 and the second stiffening ribs 12 significantly enhances the stiffness of the top plate 1, making the entire steel box girder structure more stable when subjected to external loads, which helps to ensure the safety and reliability of the bridge. Through fine stiffening rib configuration, the stress on the top plate 1 can be more evenly distributed, thereby improving its load-bearing capacity and also helping to reduce local stress concentration and prolong the service life of the structure.

[0050] Optionally, as shown in FIG. 4, a plurality of third stiffening ribs 21 are arranged at intervals on the upper end surface of the bottom plate 2. Figure 8

[0051] Specifically, a plurality of third stiffening ribs 21 are arranged at intervals on the upper end surface of the bottom plate 2. The third stiffening ribs 21 are firmly connected with the bottom plate 2 to form a whole structure, which can effectively resist deformation caused by external loads. The third stiffening ribs 21 are evenly distributed on the upper end surface of the bottom plate 2 at predetermined intervals and are firmly connected with the bottom plate 2. The shape and size of the third stiffening ribs 21 can be designed according to actual needs to ensure that they can effectively enhance the stiffness of the bottom plate 2. For example, the third stiffening ribs 21 can adopt T-shaped, I-shaped, U-shaped, or other effective cross-sectional shapes to increase their bending and shear resistance. The third stiffening ribs 21 can be welded or bolted with the bottom plate 2 to ensure firm connection. At the same time, the number, position, and size of the third stiffening ribs 21 also need to be optimized according to specific load conditions and design requirements to achieve the best mechanical effect.

[0052] In this optional embodiment, the third stiffening ribs 21 significantly enhance the stiffness of the bottom plate 2, making the entire steel box girder structure more stable when subjected to external loads, which helps to improve the safety and reliability of the bridge.

[0053] Optionally, as shown in FIG. 4, a plurality of third stiffening ribs 21 are arranged at intervals on the upper end surface of the bottom plate 2. Figure 9

[0054] ​​Specifically, on the side of the web plate 3 close to the chamber 51, a plurality of fourth stiffening ribs 31 are arranged at predetermined interval distances. The fourth stiffening ribs 31 are firmly connected with the web plate 3 to form an integral structure, which can effectively resist shear deformation and bending deformation caused by external loads. The fourth stiffening ribs 31 are uniformly distributed on the side of the web plate 3 close to the chamber 51 at predetermined interval distances and are firmly connected with the web plate 3. The shape and size of the fourth stiffening ribs 31 can be designed according to actual needs to ensure that they can effectively enhance the stiffness of the web plate 3. For example, the stiffening ribs can adopt a strip shape, a T shape, a U shape or other effective cross-sectional shapes perpendicular to the direction of the web plate 3 to increase their shear and bending resistance. During construction, the fourth stiffening ribs 31 can be welded or bolted with the web plate 3 to ensure firm connection therebetween. At the same time, the number, position and size of the fourth stiffening ribs 31 also need to be optimized according to specific load conditions and design requirements to achieve the best mechanical effect.

[0055] In this optional embodiment, the fourth stiffening ribs 31 significantly enhance the stiffness of the web plate 3, making the entire steel box girder structure more stable when subjected to external loads, which helps to improve the safety and reliability of the bridge.

[0056] Optionally, as shown in ​ the plurality of box structures 5 are sequentially spliced, and one end of the top plate 1 of the box structure 5 located at both ends in the splicing direction is provided with a first transition section 13. The first transition section 13 includes a variable-height first stiffening plate 131 and an equal-height second stiffening plate 132 connected in sequence. The first stiffening plate 131 is connected with one end of the top plate 1, and the second stiffening plate 132 is connected to the first stiffening plate 131 away from the one end of the top plate 1. The height of the first stiffening plate 131 in the upward direction gradually increases from the one end close to the top plate 1 to the one end away from the top plate 1, and the height of the second stiffening plate 132 in the upward direction is consistent with the height of the one end of the first stiffening plate 131 away from the top plate 1 in the upward direction.

[0057] Specifically, the first transition section 13 is a stiffness transition section. In bridge or building structures, when a steel box girder needs to be spliced ​​with a concrete section, a first transition section 13 is provided at one end of the top plate 1 of the steel box girder to connect with the concrete section in order to ensure a smooth transition in connection strength, stiffness, and stress distribution. The first transition section 13 is composed of a variable-height first stiffening plate 131 and a constant-height second stiffening plate 132 connected sequentially. The first stiffening plate 131 is tightly connected to one end of the top plate 1 of the steel box girder, and its height gradually increases from top to bottom, forming a smooth transition surface. This not only helps to disperse and transfer stress but also guides deformation, avoiding excessive stress and deformation at the splice. The constant-height second stiffening plate 132 is connected to the end of the first stiffening plate 131 away from the top plate 1 and maintains the same height as it. The second stiffening plate 132 provides a stable support surface, ensuring the stiffness stability of the structure in the direction away from the top plate 1. At the same time, the constant-height structural setting also makes the manufacturing and installation process simpler and more efficient.

[0058] In this optional embodiment, by sequentially connecting the variable-height first stiffening plate 131 and the equal-height second stiffening plate 132, a smooth stiffness transition section is formed. This not only enhances the connection strength between the steel box girder and the concrete section, but also optimizes the stress distribution, reduces stress concentration and deformation at the splice, and helps to improve the overall stiffness and load-bearing capacity of the structure, thus extending the service life of the structure.

[0059] Optionally, such as ​ As shown, the bottom plate 2 of the box structure 5 located at both ends along the splicing direction is provided with a second transition section 22. The second transition section 22 includes a variable height third stiffening plate. The third stiffening plate is connected to one end of the bottom plate 2. The height of the third stiffening plate gradually increases from the end closer to the bottom plate 2 to the end farther away from the bottom plate 2.

[0060] Specifically, in bridge, building or other civil engineering, when the steel structure box (such as steel box girder) needs to be spliced with the concrete section, in order to ensure that the connection between the two has sufficient stiffness and strength, a second transition section 22 is provided at one end of the bottom plate 2 of the box structure 5, which is connected to the concrete section. The second transition section 22 is composed of a variable height third stiffener. The third stiffener is tightly connected to one end of the bottom plate 2 of the box structure 5, forming a solid connection interface. The height of the third stiffener gradually increases from top to bottom, which can gradually guide and disperse the stress from the box structure 5, avoiding sudden stiffness change or stress concentration at the splicing place. The size, shape and height variation range of the variable height third stiffener can be adjusted according to the specific engineering requirements and splicing conditions. For example, the size and height variation range of the third stiffener can be determined according to the size of the box structure 5 and the concrete section, load conditions, material properties and other factors. In addition, additional connecting members (such as bolts, welds, etc.) can be provided between the third stiffener and the bottom plate 2 to further enhance the connection strength.

[0061] In this optional embodiment, by setting a stiffness transition section composed of a variable height third stiffener at one end of the bottom plate 2 of the box structure 5, the connection strength between the box structure 5 and the concrete section is significantly enhanced. The variable height third stiffener can gradually guide and disperse the stress, avoiding excessive stress concentration at the splicing place, thereby reducing the risk of structural damage.

[0062] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A steel box girder characterized by, The utility model provides box structure (5) including top plate (1), bottom plate (2) and two web (3), top plate (1) is located the top of bottom plate (2), top plate (1) is parallel with bottom plate (2), two web (3) upper end is connected in the left and right sides of top plate (1) respectively, two web (3) lower end is connected in the left and right sides of bottom plate (2) respectively, top plate (1), bottom plate (2) and two web (3) enclose and form box structure (5), form the chamber (51) in box structure (5), the inner peripheral wall of chamber (51) is spaced apart with at least two partition (4) along splicing direction, partition (4) is frame type structure, the outer peripheral wall of partition (4) is connected with the inner peripheral wall of chamber (51).

2. The steel box girder according to claim 1, characterized in that, The plane where the web (3) is located is perpendicular to the plane where the top plate (1) or the bottom plate (2) is located.

3. The steel box girder according to claim 1, wherein The partition (4) is first partition (41), and the first partition (41) includes a first frame body in a "back" shape structure, and the outer peripheral wall of the first frame body is connected with the inner peripheral wall of the chamber (51). The first frame body includes an upper horizontal plate (411), a right vertical plate (412), a lower horizontal plate (413) and a left vertical plate (414) connected in sequence. A first connecting point (415) is arranged at the middle position of the lower end of the upper horizontal plate (411) in the left-right direction. Second and third connecting points (416) and (417) are arranged at the junctions of the lower horizontal plate (413) and the right and left vertical plates (412) and (414), respectively. A first supporting rod (418) is connected between the first connecting point (415) and the second connecting point (416). A second supporting rod (419) is connected between the first connecting point (415) and the third connecting point (417).

4. The steel box girder according to claim 1, wherein The partition plate (4) is the first partition plate (41) or the second partition plate (42). The first partition plate (41) and the second partition plate (42) are arranged at intervals and alternately along the splicing direction of the box body structure (5) in the chamber (51). The outer peripheral walls of the first partition plate (41) and the second partition plate (42) are both connected to the inner peripheral wall of the chamber (51). The first partition plate (41) includes a first frame body in a "return" - shaped structure. The outer peripheral wall of the first frame body is connected to the inner peripheral wall of the chamber (51). The first frame body includes an upper cross - plate (411), a right vertical plate (412), a lower cross - plate (413) and a left vertical plate (414) connected in sequence. A first connection point (415) is provided at the middle position of the lower end of the upper cross - plate (411) in the left - right direction. Second connection points (416) and third connection points (417) are respectively provided at the joints of the lower cross - plate (413) with the right vertical plate (412) and the left vertical plate (414). A first support rod (418) is connected between the first connection point (415) and the second connection point (416), and a second support rod (419) is connected between the first connection point (415) and the third connection point (417). The second partition plate (42) includes a second frame body in a "return" - shaped structure.

5. The steel box girder according to claim 1, wherein A plurality of first stiffening ribs (11) are provided at intervals on the lower end surface of the top plate (1).

6. The steel box girder according to claim 5, wherein A plurality of second stiffening ribs (12) are provided at intervals on the lower end surfaces of both sides of the top plate (1) in the left - right direction. The second stiffening ribs (12) are located on both sides of the plurality of first stiffening ribs (11).

7. The steel box girder of claim 1, wherein, A plurality of third stiffening ribs (21) are provided at intervals on the upper end surface of the bottom plate (2).

8. The steel box girder of claim 1, wherein, A plurality of fourth stiffening ribs (31) are provided at intervals on the side surface of the web (3) close to the chamber (51).

9. The steel box girder of claim 1, wherein, A plurality of the box body structures (5) are spliced in sequence. At one end of the top plate (1) of the box body structures (5) located at both ends along the splicing direction, a first transition section (13) is provided. The first transition section (13) includes a variable - height first stiffening plate (131) and an equal - height second stiffening plate (132) connected in sequence. The first stiffening plate (131) is connected to one end of the top plate (1). The second stiffening plate (132) is connected between the first stiffening plate (131) and the end far from the top plate (1). The height of the first stiffening plate (131) in the up - down direction gradually increases from the end close to the top plate (1) to the end far from the top plate (1). The height of the second stiffening plate (132) in the up - down direction is the same as the height of the end of the first stiffening plate (131) far from the top plate (1) in the up - down direction.

10. The steel box girder according to claim 9, characterized in that, One end of the bottom plate (2) of the box structure (5) located at both ends along the splicing direction is provided with a second transition section (22), the second transition section (22) comprises a variable-height third stiffener plate, the third stiffener plate is connected with one end of the bottom plate (2), and the height of the third stiffener plate in the upward direction gradually increases from the end close to the bottom plate (2) to the end away from the bottom plate (2).

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