Box-type composite beam and large-span cable-stayed bridge

Abstract

The invention discloses a box-type composite beam and a large-span cable-stayed bridge, and relates to the technical field of bridge construction, the box-type composite beam comprises a middle bottom plate erected on a pier of the large-span cable-stayed bridge; the side bottom plates are arranged at the two ends of the middle bottom plate and are arranged along the extension line of the middle bottom plate; the composite beam middle webs are arranged at the two ends of the middle bottom plate and are parallel to piers of the large-span bridge; the first steel pipe is arranged at the end part of the middle bottom plate and is fixedly connected with one end of the middle bottom plate, one end of the side bottom plate and one end of the composite beam middle web plate respectively; and the concrete is poured in the first steel pipe. The first steel pipes for pouring concrete are fixedly connected with the middle bottom plates, the side bottom plates and the composite beam middle webs, hogging moment generated by the main beam in the main tower area and near the auxiliary piers and axial force of the main beam are borne through the first steel pipes for pouring concrete, the steel use amount of the box type composite beam erected at the piers is reduced, and the engineering cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to a box type composite beam and a long-span cable-stayed bridge. BACKGROUND

[0002] With the continuous upgrading of engineering construction demand and the rapid iteration of bridge technology, long-span cable-stayed bridges have achieved a breakthrough in kilometer-level span, and are increasingly widely used in major transportation projects.

[0003] However, when the span of the long-span cable-stayed bridge is continuously increased, the main beam will produce a significant negative bending moment in the main tower area and near the auxiliary pier. After the negative bending moment and the axial force of the main beam are superimposed, the compression stress of the lower edge of the main beam erected at the pier will be significantly high. In order to resist the compression stress generated by the superposition of the negative bending moment and the axial force at the pier, a large amount of steel material needs to be added, which increases the engineering cost. SUMMARY

[0004] The present application provides a box type composite beam and a long-span cable-stayed bridge, which can solve the problem of increasing the amount of steel material to resist the compression stress generated by the superposition of the negative bending moment and the axial force at the pier, thereby increasing the engineering cost.

[0005] In a first aspect, the embodiments of the present application provide a box type composite beam, which comprises: a middle bottom plate, which is erected on a pier of a long-span cable-stayed bridge; a side bottom plate, which is arranged at both ends of the middle bottom plate and along the extension line of the middle bottom plate; a composite beam middle web plate, which is arranged at both ends of the middle bottom plate and along the longitudinal direction of the bridge of the long-span cable-stayed bridge; a first steel pipe, which is arranged at the end of the middle bottom plate and is fixedly connected with one end of the middle bottom plate, the side bottom plate and the composite beam middle web plate, respectively; concrete, which is poured in the first steel pipe.

[0006] In combination with the first aspect, in an embodiment, the box type composite beam further comprises: a shear connecting key, which is fixedly arranged inside the first steel pipe.

[0007] In combination with the first aspect, in an embodiment, the box type composite beam further comprises: a top plate, which is fixedly connected with the other end of the composite beam middle web plate.

[0008] In combination with the first aspect, in an embodiment, the box type composite beam further comprises: a tuyere, which is fixedly connected with one end of the top plate and the other end of the side bottom plate, respectively.

[0009] In combination with the first aspect, in one embodiment, further comprising: a first edge web, two ends of the first edge web being fixedly connected with the edge bottom plate and the top plate respectively; a second edge web, two ends of the second edge web being fixedly connected with the edge bottom plate and the top plate respectively, and the second edge web being arranged between the first edge web and the wind nozzle.

[0010] In the second aspect, the embodiments of the present application provide a large-span cable-stayed bridge using the box-type composite beam, comprising: a pressure bearing plate, one side of the pressure bearing plate being fixedly connected with one side of the box-type composite beam; a transition steel box beam, one side of the transition steel box beam being fixedly connected with the other side of the pressure bearing plate; a steel box beam, one side of the steel box beam being connected with the other side of the transition steel box beam.

[0011] In combination with the second aspect, in one embodiment, the transition steel box beam comprises: a first steel beam middle bottom plate; a first steel beam edge bottom plate, the first steel beam edge bottom plate being arranged at two ends of the first steel beam middle bottom plate and along the extension line of the first steel beam middle bottom plate; a first steel beam middle web, the first steel beam middle web being arranged at two ends of the first steel beam middle bottom plate and along the longitudinal direction of the large-span cable-stayed bridge; a second steel pipe, the second steel pipe comprising: a first pipe wall, two ends of the first pipe wall being fixedly connected with the first steel beam middle bottom plate and the first steel beam edge bottom plate respectively; a second pipe wall, two ends of the second pipe wall being fixedly connected with the first steel beam middle bottom plate and the first steel beam middle web respectively; a third pipe wall, two ends of the third pipe wall being fixedly connected with the first steel beam middle web and the first steel beam edge bottom plate respectively.

[0012] In combination with the second aspect, in one embodiment: the first steel pipe and the second steel pipe have equal inner diameters and thicknesses, and are fixedly connected on both sides of the pressure bearing plate respectively.

[0013] In combination with the second aspect, in one embodiment, further comprising: vertical stiffening ribs, the vertical stiffening ribs being arranged in the second steel pipe, and being welded with the second steel pipe wall, the pressure bearing plate, and the first steel beam middle bottom plate or the first steel beam edge bottom plate respectively; horizontal stiffening ribs, the horizontal stiffening ribs being arranged perpendicularly to the vertical stiffening ribs, and being welded with the second steel pipe wall, the first steel beam middle web, and the pressure bearing plate respectively.

[0014] In combination with the second aspect, in an embodiment, the steel box girder comprises: a second steel beam bottom plate; a second steel beam middle web plate, which is arranged at both ends of the second steel beam bottom plate and along the longitudinal direction of the bridge of the long-span cable-stayed bridge; a second steel beam side bottom plate, which is arranged at both ends of the second steel beam bottom plate and along the extension line of the second steel beam bottom plate; both ends of the second steel beam bottom plate are fixedly connected with the second steel beam middle web plate and one end of the second steel beam side bottom plate respectively.

[0015] The technical scheme provided by the embodiment of the present application has the following beneficial effects: The present application discloses a box-type composite beam and a long-span cable-stayed bridge. The box-type composite beam comprises a middle bottom plate, which is arranged on the pier of the long-span cable-stayed bridge; a side bottom plate, which is arranged at both ends of the middle bottom plate and along the extension line of the middle bottom plate; a composite beam middle web plate, which is arranged at both ends of the middle bottom plate and parallel to the pier of the long-span bridge; a first steel pipe, which is arranged at the end of the middle bottom plate and fixedly connected with one end of the middle bottom plate, the side bottom plate and the composite beam middle web plate respectively; and concrete, which is poured into the first steel pipe. The first steel pipe for pouring concrete is fixedly connected with the middle bottom plate, the side bottom plate and the composite beam middle web plate, the first steel pipe for pouring concrete bears the negative bending moment and the axial force of the main beam generated near the main tower area and the auxiliary pier, the use amount of steel of the box-type composite beam arranged on the pier is reduced, and the engineering cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 It is a front view of the long-span cable-stayed bridge of the embodiment of the present application. Figure 2 It is a standard section view of the box-type composite beam of the embodiment of the present application. Figure 3 It is a standard section view of the steel box girder of the embodiment of the present application. Figure 4 It is a standard section view of the transition steel box girder of the embodiment of the present application. Figure 5 It is a large-scale drawing of the box-type composite beam A of the embodiment of the present application. Figure 6 I-I section view of a long-span cable-stayed bridge according to an embodiment of the present application; Figure 7 II-II section view of a long-span cable-stayed bridge according to an embodiment of the present application; Figure 8 III-III section view of a long-span cable-stayed bridge according to an embodiment of the present application.

[0018] In the figure: 1, box-shaped composite beam; 101, top plate; 102, middle bottom plate; 103, side bottom plate; 104, first steel pipe; 105, concrete; 106, shear connecting key; 107, web plate in the composite beam; 108, first side web plate; 109, second side web plate; 110, wind nozzle; 2, steel box beam; 201, second steel beam bottom plate; 202, second steel beam web plate; 203, second steel beam side bottom plate; 3, transition steel box beam; 301, first steel beam middle bottom plate; 302, first steel beam web plate; 303, second steel pipe; 3031, first pipe wall; 3032, second pipe wall; 3033, third pipe wall; 304, vertical stiffening rib; 305, horizontal stiffening rib; 306, first steel beam side bottom plate; 4, bearing plate. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] With the continuous upgrading of engineering construction demand and the rapid iteration of bridge technology, long-span cable-stayed bridges have achieved a breakthrough in kilometer-level span, and are increasingly widely used in major transportation projects. However, as the span continues to increase, the main beam will produce significant negative bending moment in the main tower area and near the auxiliary pier. After the superposition of the negative bending moment and the axial force of the main beam, the compressive stress of the lower edge of the main beam erected at the pier will be significantly high, which not only poses a severe challenge to the strength reserve and stability control of the structure, but also causes a substantial increase in the use of steel, directly pushing up the project cost.

[0021] In addition, for railway bridges, the auxiliary pier top and the main tower area are provided with bearings, so that the boundary conditions of the main beam are changed from multi-point elastic support to rigid support, causing a sudden change in constraint stiffness, and thus leading to a sudden change in deformation of the main beam in this area, which has an adverse effect on train operation.

[0022] Therefore, it is necessary to optimize the stress performance of long-span cable-stayed bridges and improve the rationality and engineering economy of structural design.

[0023] As Figure 1 , 2 , 5, the embodiment of the present application discloses a box type composite beam, the box type composite beam 1 includes: the middle bottom plate 102, the middle bottom plate 102 is erected on the pier of long-span cable-stayed bridge;The side bottom plate 103 is arranged at the both ends of the middle bottom plate 102 and along the extension line of the middle bottom plate 102;The composite beam middle web plate 107 is arranged at the both ends of the middle bottom plate 102 and along the longitudinal direction of the bridge of long-span cable-stayed bridge;The first steel pipe 104 is arranged at the end of the middle bottom plate 102, and is respectively fixedly connected with one end of the middle bottom plate 102, the side bottom plate 103 and the composite beam middle web plate 107;The concrete 105 is poured in the first steel pipe 104.

[0024] The bottom plate of the box type composite beam 1 includes the middle bottom plate 102 and the side bottom plate 103, the middle bottom plate 102 is in contact with the pier of long-span cable-stayed bridge, and is the main stress surface of the box type composite beam 1.The side bottom plate 103 is arranged at the both sides of the middle bottom plate 102, and is the extension of the middle bottom plate 102 to the both sides.

[0025] The composite beam middle web plate 107 is arranged inside the box type composite beam 1 and along the longitudinal direction of the bridge of long-span cable-stayed bridge, and is mainly used for transmitting shear force to the pier of long-span cable-stayed bridge.

[0026] The first steel pipe 104 has two, which are respectively arranged at the both ends of the middle bottom plate 102, and the first steel pipe 104 is fixedly connected with one end of the middle bottom plate 102, the side bottom plate 103 and the composite beam middle web plate 107.Further, the first steel pipe 104 is an integral body welded with the middle bottom plate 102, the side bottom plate 103 and the composite beam middle web plate 107.The inside of the first steel pipe 104 is poured with the concrete 105, and further, the concrete 105 is high-strength concrete, which can bear greater pressure.

[0027] The main beam is combined by the box type composite beam 1, the steel box beam 2 and the transition steel box beam 3.

[0028] Because the box type composite beam 1 arranged above the pier is subjected to the superposition of negative bending moment and the axial force of the main beam, the force of the box type composite beam 1 along the pier direction is significantly greater than the force of the steel box beam 2 and the transition steel box beam 3.The axial compression and negative bending moment mainly borne by the box type composite beam 1 can be arranged at the force contact position of the box type composite beam 1 and the pier, and the first steel pipe 104 poured with the concrete 105.The concrete 105 has the characteristics of compression without tension, and can bear greater pressure.

[0029] Under the control condition, the main girder of the long-span cable-stayed bridge bears the axial force and the negative bending moment in the main tower and auxiliary pier area at the same time, resulting in a large compressive stress on the lower edge of the main girder. If the pure steel box girder scheme is adopted in the area, the bottom plate steel structure will generate a very high compressive stress, which puts a strict requirement on the bearing capacity reserve and stability control of the structure, and at the same time, leads to a large increase in the amount of steel. If the main girder in the area is replaced by the box-type composite girder 1, and the first steel pipe 104 poured with concrete 105 is used at the intersection of the web plate 107 and the middle bottom plate 102 and the edge bottom plate 103 in the composite girder, the first steel pipe 104 poured with concrete 105 is just located in the compression zone, which can not only fully exert the compression advantage of the concrete 105, but also reduce the stress level of the steel of the box-type composite girder 1, thereby improving the bearing capacity and stability of the structure, reducing the amount of steel, and finally significantly optimizing the stress performance and engineering economy of the structure.

[0030] The boundary conditions of the main girder are changed from multi-point elastic support to rigid support due to the setting of the bearing at the top of the auxiliary pier and the main tower area, resulting in a sudden change in the constraint stiffness, and further causing a sudden deformation of the main girder in the pier area, which has an adverse effect on train operation. After the box-type composite girder 1 is used at the pier, the stiffness of the main girder is significantly improved, which can effectively reduce the deformation of the girder in the auxiliary pier and the main tower area, make the structure deformation more uniform, and improve the stability and comfort of train operation.

[0031] The first steel pipe poured with concrete is fixedly connected with the middle bottom plate, the edge bottom plate and the web plate in the composite girder, the negative bending moment generated by the main girder in the main tower area and near the auxiliary pier and the axial force of the main girder are borne by the first steel pipe poured with concrete, which reduces the amount of steel of the box-type composite girder erected at the pier and reduces the engineering cost.

[0032] As shown in Figure 5 , in an embodiment, further comprising: a shear connecting key 106 fixedly arranged inside the first steel pipe 104.

[0033] The arrangement of the shear connecting key 106 in the first steel pipe 104 can ensure that the first steel pipe 104 and the internally poured concrete 105 can work cooperatively. By effectively transmitting the shear force at the interface between the two, relative slip and vertical separation are prevented, thereby improving the carrying capacity and stiffness of the overall structure.

[0034] The present application can improve the overall stiffness, carrying capacity and durability of the structure by arranging the shear connecting key in the first steel pipe.

[0035] As shown in Figure 2 , 5 , in an embodiment, further comprising: a top plate 101 fixedly connected with the other end of the web plate 107 of the composite girder.

[0036] The box type composite beam 1 further comprises a top plate 101 arranged on the side of the middle bottom plate 102 away from the pier, and the top plate 101 is fixedly connected with the other end of the composite beam middle web plate 107.

[0037] As shown in Figure 2 In an embodiment, the box type composite beam 1 further comprises a wind nozzle 110 fixedly connected with one end of the top plate 101 and the other end of the edge bottom plate 103.

[0038] The wind nozzle 110 is arranged at two ends of the top plate 101, and the wind nozzle 110 is fixedly connected with the top plate 101 and the edge bottom plate 103.

[0039] The wind nozzle 110 is used to improve the wind resistance stability of the box type composite beam 1, and enhance the safety by shunting wind pressure and inhibiting harmful vibration.

[0040] The wind nozzle 110 is used to improve the wind resistance stability of the box type composite beam 1, and enhance the safety by shunting wind pressure and inhibiting harmful vibration.

[0041] As shown in Figure 2 In an embodiment, the box type composite beam 1 further comprises a first edge web plate 108 fixedly connected with the edge bottom plate 103 and the top plate 101, and a second edge web plate 109 arranged between the first edge web plate 108 and the wind nozzle 110 and fixedly connected with the edge bottom plate 103 and the top plate 101.

[0042] The first edge web plate 108 and the second edge web plate 109 are arranged inside the box type composite beam 1 and close to the two sides of the wind nozzle 110.

[0043] The first edge web plate 108 and the second edge web plate 109 are arranged inside the box type composite beam 1 and close to the two sides of the wind nozzle 110.

[0044] As shown in Figure 1 、 6 , As shown in FIG. 7, the embodiment of the box type composite beam is also used in a large-span cable-stayed bridge, which comprises a pressure bearing plate 4 fixedly connected with one side of the box type composite beam 1, a transition steel box beam 3 fixedly connected with the other side of the pressure bearing plate 4, and a steel box beam 2 connected with the other side of the transition steel box beam 3.

[0045] The main girder of the long-span cable-stayed bridge comprises a box-type composite beam 1, a steel box beam 2 and a transition steel box beam 3. The box-type composite beam 1 is erected on the pier, and is connected with one side of the transition steel box beam 3 through the bearing plate 4 on both sides of the box-type composite beam 1, and the other side of the transition steel box beam 3 is further connected with the steel box beam 2. According to the stress characteristics of different positions of the main girder of the long-span cable-stayed bridge, the main girder is compressed at the lower edge of the pier, and the box-type composite beam 1 arranged at the position can save the amount of steel; the main girder is small in stress at the suspended position, and the steel box beam 2 with light self-weight is used; in order to ensure that the load on the steel box beam 2 is smoothly transferred to the box-type composite beam 1, the transition steel box beam 3 is arranged between the box-type composite beam 1 and the steel box beam 2.

[0046] The present application can ensure that the load on the steel box beam is transferred to the box-type composite beam by arranging the transition steel box beam between the box-type composite beam and the steel box beam.

[0047] As shown in Figure 4 , 6 , 7, in an embodiment, the transition steel box beam 3 comprises: a first steel beam middle bottom plate 301; a first steel beam side bottom plate 306, which is arranged at both ends of the first steel beam middle bottom plate 301 and along the extension line of the first steel beam middle bottom plate 301; a first steel beam middle web plate 302, which is arranged at both ends of the first steel beam middle bottom plate 301 and along the longitudinal direction of the bridge of the long-span cable-stayed bridge; and a second steel pipe 303, which comprises: a first pipe wall 3031, which is fixedly connected with the first steel beam middle bottom plate 301 and the first steel beam side bottom plate 306 at both ends respectively; a second pipe wall 3032, which is fixedly connected with the first steel beam middle bottom plate 301 and the first steel beam middle web plate 302 at both ends respectively; and a third pipe wall 3033, which is fixedly connected with the first steel beam middle web plate 302 and the first steel beam side bottom plate 306 at both ends respectively.

[0048] The bottom plate of the transition steel box beam 3 comprises the first steel beam middle bottom plate 301 and the first steel beam side bottom plate 306. The first steel beam side bottom plate 306 is arranged at both sides of the first steel beam middle bottom plate 301 and is an extension of the first steel beam middle bottom plate 301 to both sides.

[0049] The first steel beam middle web plate 302 is arranged inside the transition steel box beam 3 and along the longitudinal direction of the bridge of the long-span cable-stayed bridge, and is used for supporting the transition steel box beam 3 and transferring the shear force on the main girder.

[0050] The second steel pipe 303 has two, and each second steel pipe 303 is spliced by the first pipe wall 3031, the second pipe wall 3032 and the third pipe wall 3033. One end of the first steel beam middle bottom plate 301, the first steel beam side bottom plate 306 and the first steel beam middle web plate 302 is fixedly connected and arranged inside the second steel pipe 303.

[0051] The transition steel box girder 3 has the same shape as the box composite girder 1, and the difference is that the second steel pipe 303 is not filled with concrete. In this way, the box composite girder 1 and the steel box girder 2 can be connected into a smooth whole.

[0052] The present application can connect the box composite girder and the steel box girder into a smooth whole by arranging the transition steel box girder with the same shape as the box composite girder.

[0053] As shown in Figure 6 , 7 In an embodiment, the first steel pipe 104 and the second steel pipe 303 have the same inner diameter and thickness, and are fixedly connected on both sides of the pressure plate 4.

[0054] The first steel pipe 104 and the second steel pipe 303 have the same inner diameter and thickness, are welded on both sides of the pressure plate 4, and the center lines of the first steel pipe 104 and the second steel pipe 303 coincide. In this way, the stress and stiffness transition between the box composite girder 1 and the steel box girder 2 is smooth.

[0055] The present application can ensure the smooth stress and stiffness transition between the box composite girder and the steel box girder by arranging the second steel pipe with the same inner diameter and thickness as the first steel pipe on one side of the pressure plate.

[0056] As shown in Figure 6 , 7 , 8, in an embodiment, further comprising: vertical stiffening ribs 304 arranged in the second steel pipe 303, which are respectively welded with the pipe wall of the second steel pipe 303, the pressure plate 4, and the first steel beam middle bottom plate 301 or the first steel beam edge bottom plate 306; horizontal stiffening ribs 305 arranged perpendicularly to the vertical stiffening ribs 304, which are respectively welded with the pipe wall of the second steel pipe 303, the first steel beam middle web plate 302, and the pressure plate 4.

[0057] In order to increase the stiffness of the second steel pipe 303, a plurality of horizontal stiffening ribs 305 arranged horizontally and vertical stiffening ribs 304 arranged perpendicularly to the horizontal stiffening ribs 305 are welded on the inner wall of the second steel pipe 303.

[0058] The horizontal stiffening ribs 305 and the vertical stiffening ribs 304 close to the pressure plate 4 are welded with the pressure plate 4. The horizontal stiffening ribs 305 inside the second steel pipe 303 are also welded with the first steel beam middle web plate 302, and the vertical stiffening ribs 304 are also welded with the first steel beam middle bottom plate 301 or the first steel beam edge bottom plate 306.

[0059] The present application can increase the stiffness and stress capacity of the second steel pipe by welding a plurality of horizontal stiffening ribs and vertical stiffening ribs inside the second steel pipe, and can transmit the pressure at the lower edge of the steel box girder 2 to the concrete 105.

[0060] As Figure 3 、 6 , shown in Figure 7, in an embodiment, the steel box girder 2 comprises: a second steel beam bottom plate 201, a second steel beam middle web 202, which is arranged at both ends of the second steel beam bottom plate 201 and along the bridge longitudinal direction of the long-span cable-stayed bridge; a second steel beam side bottom plate 203, which is arranged at both ends of the second steel beam bottom plate 201 and along the extension line of the second steel beam bottom plate 201; and one end of the second steel beam side bottom plate 203 is fixedly connected with one end of the second steel beam middle web 202 and one end of the second steel beam bottom plate 201 respectively.

[0061] The outer shape of the steel box girder 2 is the same as that of the box-type composite girder 1 and the transition steel box girder 2, and the steel box girder 2 is a suspended setting part of the main girder and is mainly used for vehicles passing through.

[0062] The bottom plate of the steel box girder 2 comprises the second steel beam bottom plate 201 and the second steel beam side bottom plate 203. The second steel beam side bottom plate 203 is arranged at both sides of the second steel beam bottom plate 201 and is an extension of the second steel beam bottom plate 201 to both sides.

[0063] The second steel beam middle web 202 is arranged inside the steel box girder 2 and along the bridge longitudinal direction of the long-span cable-stayed bridge, and is mainly used for transmitting shear force in the steel box girder 2.

[0064] The present application can ensure that the box-type composite girder, the steel box girder and the transition steel box girder are smoothly connected into a whole by arranging the steel box girder with the same outer shape structure as the box-type composite girder.

[0065] In the description of the present application, it should be noted that the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0067] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the scope of the application is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A box-type composite beam, characterized in that, The box-type composite beam (1) includes: The middle bottom plate (102) is erected on the piers of the long-span cable-stayed bridge; Side base plate (103), the side base plate (103) is disposed at both ends of the middle base plate (102) and is disposed along the extension line of the middle base plate (102); The composite beam web plate (107) is located at both ends of the bottom plate (102) and is arranged along the longitudinal direction of the long-span cable-stayed bridge. The first steel pipe (104) is located at the end of the middle bottom plate (102) and is fixedly connected to one end of the middle bottom plate (102), the side bottom plate (103), and the web plate (107) of the composite beam. Concrete (105), which is poured into the first steel pipe (104).

2. The box-type composite beam according to claim 1, characterized in that, Also includes: A shear connection key (106) is fixedly disposed inside the first steel pipe (104).

3. A box-type composite beam according to claim 1, characterized in that, Also includes: The top plate (101) is fixedly connected to the other end of the web plate (107) of the composite beam.

4. A box-type composite beam according to claim 3, characterized in that, Also includes: Air nozzle (110) is fixedly connected to one end of the top plate (101) and the other end of the side bottom plate (103).

5. A box-type composite beam according to claim 4, characterized in that, Also includes: The first side web plate (108) has two ends fixedly connected to the side bottom plate (103) and the top plate (101), respectively. The second side web plate (109) is disposed between the first side web plate (108) and the air nozzle (110), and its two ends are fixedly connected to the side bottom plate (103) and the top plate (101) respectively.

6. A long-span cable-stayed bridge, using the box-girder composite beam as described in any one of claims 1-5, characterized in that, include: A pressure plate (4) is fixedly connected to one side of the box-type composite beam (1) on one side. A transition steel box girder (3) is fixedly connected on one side to the other side of the pressure plate (4); A steel box girder (2) is connected on one side to the other side of the transition steel box girder (3).

7. A long-span cable-stayed bridge according to claim 6, characterized in that, The transition steel box girder (3) includes: First steel beam bottom plate (301); The first steel beam side bottom plate (306) is located at both ends of the first steel beam middle bottom plate (301) and is set along the extension line of the first steel beam middle bottom plate (301); The first steel beam web plate (302) is located at both ends of the first steel beam bottom plate (301) and is arranged along the longitudinal direction of the long-span cable-stayed bridge. The second steel pipe (303) comprises: The first pipe wall (3031) is fixedly connected at both ends to the bottom plate (301) of the first steel beam and the side bottom plate (306) of the first steel beam, respectively; The second pipe wall (3032) is fixedly connected at both ends to the bottom plate (301) and the web plate (302) of the first steel beam, respectively. The third pipe wall (3033) is fixedly connected at both ends to the web plate (302) of the first steel beam and the bottom plate (306) of the first steel beam, respectively.

8. A long-span cable-stayed bridge according to claim 7, characterized in that: The first steel pipe (104) and the second steel pipe (303) have the same inner diameter and thickness, and are respectively fixedly connected to both sides of the pressure plate (4).

9. A long-span cable-stayed bridge according to claim 7, characterized in that, Also includes: Vertical stiffening rib (304) is provided inside the second steel pipe (303), and is welded to the pipe wall of the second steel pipe (303), the pressure plate (4), and also to the bottom plate (301) of the first steel beam or the side bottom plate (306) of the first steel beam. Horizontal stiffening rib (305) is arranged perpendicularly to the vertical stiffening rib (304), and is welded to the wall of the second steel pipe (303), the web plate (302) of the first steel beam, and the pressure plate (4) respectively.

10. A long-span cable-stayed bridge according to claim 6, characterized in that, The steel box girder (2) includes: Second steel beam bottom plate (201). The second steel beam web plate (202) is located at both ends of the second steel beam bottom plate (201) and is set along the longitudinal direction of the long-span cable-stayed bridge. The second steel beam side bottom plate (203) is located at both ends of the second steel beam bottom plate (201) and is set along the extension line of the second steel beam bottom plate (201); The two ends of the second steel beam bottom plate (201) are fixedly connected to one end of the second steel beam web plate (202) and the second steel beam side bottom plate (203), respectively.

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