Separating type steel box girder structure and construction method

Abstract

The separated steel box girder structure comprises steel box girders arranged at the two ends in the transverse bridge direction, each steel box girder comprises a top plate, a flat bottom plate is arranged at the bottom of each top plate, the outer side end of each flat bottom plate is fixedly connected with one end of an outer side inclined bottom plate, and the inner side end of each flat bottom plate is fixedly connected with one end of an inner side inclined bottom plate; a first web plate and a second web plate are fixedly mounted between the top plate and the outer side inclined bottom plate and between the top plate and the inner side inclined bottom plate; the transverse connecting box comprises a transverse connecting box top plate, a transverse connecting box bottom plate is arranged at the bottom of the transverse connecting box top plate, and a transverse connecting box web plate is arranged between the transverse connecting box top plate and the transverse connecting box bottom plate; according to the split type steel box girder, the split type steel box girders are connected through the transverse connecting boxes, the integrity of the steel box girders is enhanced, and the vortex vibration problem of the main girder is effectively solved by arranging the vortex isolating plates and the lower stabilizing plates.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and more specifically, relates to a separated steel box girder structure and a construction method. Background Art

[0002] Cable-stayed bridges have excellent spanning capacity and are widely built around the world. Cable-stayed bridges are generally composed of foundations, towers, piers, cables, main beams and other components. During use, the main beam directly bears the traffic load transmitted by the bridge deck, and most of the load is transmitted to the towers via the cables, and finally to the foundation. At present, for cable-stayed bridges with smaller spans, concrete is mostly used as the main material for the main beam. When the span increases, the deadweight of the concrete main beam also increases, which will have an adverse effect on the overall performance and stability of the bridge. Steel box girders, as a lightweight and high-strength material, are widely used in large-span cable-stayed bridges. Steel box girders have the advantages of light weight, high strength, and good toughness. They can effectively reduce the deadweight of the bridge and improve the spanning capacity of the bridge. Among them, integral steel box girders have been widely used due to their good integrity, easy manufacturing, transportation and installation.

[0003] At present, the integral steel box girder is widely used in bridges at home and abroad. It generally adopts a closed box section, which has the advantages of good integrity and is easy to manufacture, transport, and install. The limitation of the integral steel box girder is that as the span increases, the flutter performance of the integral steel box decreases rapidly. Under the action of wind loads (such as strong typhoons), it is a great challenge to ensure the safety of the bridge structure; in addition, when the main beam adopts an integral section, the cable tower column cannot pass through the main beam and needs to bypass it from both sides of the main beam, which will not only increase the width of the steel box girder and increase the floor area, but also have an adverse effect on flood discharge and navigation. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a separated steel box girder structure and a construction method. By separating the left and right sections of the steel box girder, the separated steel box girder has a smaller deadweight than the integral steel box girder, so that it has a stronger spanning capacity and greater torsional and bending stiffness, which helps to improve the stability and bearing capacity of the bridge, and can be applied to single-column cable towers, reducing the footprint of the lower structure and the impact on flood discharge and navigation. The separated steel box girder forms a lighter and more transparent visual effect by separating the left and right sections, and can be integrated with the surrounding natural scenery. The bridge is designed to achieve harmonious coexistence with the natural environment and enhance the landscape value of the bridge; the separated steel box girders are connected by transverse connecting boxes, which enhances the overall stability of the steel box girders. The increase in the overall transverse width improves the transverse stiffness and torsional stiffness of the steel box girder section, significantly improves the flutter stability of the main beam, and ensures the safe operation of the bridge; the wind nozzle is set on the outside of the steel box girder, the vortex isolation plate is set on the inside, and multiple lower stabilizing plates are set at the bottom of the transverse connecting box along the longitudinal direction at the central separation position, which helps to improve the aerodynamic performance of the steel box girder, reduce the vibration caused by wind load, and improve the wind resistance stability of the bridge. The vortex isolation plate on the inside of the steel box girder helps to weaken the large-scale vortex at the slot, effectively control the vortex-induced vibration of the bridge, and reduce the vibration response caused by the vortex; the unique shape of the wind nozzle can guide the wind flow, allowing it to pass through the bridge more smoothly, thereby reducing wind resistance.

[0005] In order to achieve the above-mentioned object, according to one aspect of the present invention, a separated steel box girder structure is provided, comprising a steel box girder arranged at both ends of the transverse bridge direction, comprising a top plate arranged at the bottom of the bridge deck, a flat bottom plate is arranged at the bottom of the top plate, an outer end of the flat bottom plate is fixedly connected to one end of the outer inclined bottom plate, an inner end of the flat bottom plate is fixedly connected to one end of the inner inclined bottom plate, a first web plate is fixedly installed between the top plate and the outer inclined bottom plate, a second web plate is arranged between the top plate and the inner inclined bottom plate, and the top plate, the first web plate, the outer inclined bottom plate, the flat bottom plate, the inner inclined bottom plate and the second web plate form a closed cavity;

[0006] A reinforcing member, comprising a lower stabilizing plate and a vortex isolating plate, wherein the vortex isolating plate is fixedly installed on the inner side of the steel box girder, and its top surface is flush with the top surface of the steel box girder, and a plurality of lower stabilizing plates are fixedly installed on the bottom of the transverse connection box, which extend along the longitudinal direction of the bridge and are arranged parallel to the steel box girder;

[0007] And a transverse connecting box arranged between the steel box girders at both ends of the transverse bridge, which includes a transverse connecting box top plate, a transverse connecting box bottom plate is arranged at the bottom of the transverse connecting box top plate, a transverse connecting box web plate is arranged between the transverse connecting box top plate and the transverse connecting box bottom plate, and the transverse connecting box top plate, the transverse connecting box bottom plate and the transverse connecting box web plate form a closed cavity.

[0008] Furthermore, a plurality of transverse partitions are provided inside the steel box girder at intervals along the longitudinal direction of the bridge, the plane where the transverse partitions are located is parallel to the cross section of the cavity, and the two ends, top surface and bottom surface of the transverse partitions are respectively connected to the inner wall of the steel box girder by welding.

[0009] Furthermore, a plurality of first stiffening ribs arranged at intervals are provided on the inner wall of the cavity surrounded by the top plate, the first web plate, the outer inclined bottom plate, the flat bottom plate, the inner inclined bottom plate and the second web plate.

[0010] Furthermore, a plurality of in-box transverse partitions are longitudinally spaced apart inside the transverse connection box, and the plane where the in-box transverse partitions are located is parallel to the cross section of the cavity.

[0011] Furthermore, a plurality of second stiffening ribs arranged at intervals are provided on the inner wall of the cavity surrounded by the transverse connection box top plate, the transverse connection box bottom plate and the transverse connection box web plate.

[0012] Furthermore, the transverse connecting box webs correspond one-to-one to the transverse partitions inside the steel box beams.

[0013] Furthermore, the angle between the outer inclined bottom plate and the horizontal is 16.7°, and the angle between the inner inclined bottom plate and the horizontal is 22.62°.

[0014] Furthermore, a tuyere is provided on the outer side of the steel box girder, and a stay cable anchor box is provided inside the tuyere.

[0015] Furthermore, the stay cable anchor box and the transverse connection box are located at the same cross-sectional position of the steel box girder.

[0016] According to a second aspect of the present invention, there is provided a construction method of a separated steel box girder, comprising the following steps:

[0017] S100: In the factory or on the construction site, manufacture the transverse connection box, reinforcement components, air nozzles and stay cable anchor boxes according to the design drawings;

[0018] S200: Divide the steel box girder into multiple sections for manufacturing according to the design drawings, ensure that the size and shape of the components meet the design requirements, and fix the transverse connection box, reinforcement components, wind nozzles and inclined cable anchor boxes on the corresponding steel box girder sections;

[0019] S300: transport the assembled steel box girder segments to the construction site, take a segment of the steel box girder, use a crane to lift the steel box girder segment to the predetermined position, use measuring equipment to accurately position it to ensure safe and accurate installation, and use welding to connect the current segment with the previous segment. After the connection is completed, tighten and inspect it to ensure that the connection is firm and reliable;

[0020] S400: Take another section of the steel box girder, use a crane to lift the steel box girder section to the predetermined position, use measuring equipment to accurately locate it to ensure safe and accurate installation, and use welding to connect this section with the previous section. After the connection is completed, tighten and inspect it to ensure that the connection is firm and reliable;

[0021] S500: Repeat step S400 until all steel box girder segments are constructed.

[0022] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0023] 1. A separated steel box girder structure of the present invention has a smaller deadweight than an integral steel box girder by separating the left and right sections of the steel box girder, so that it has a stronger spanning capacity and greater torsional and bending stiffness, which helps to improve the stability and bearing capacity of the bridge, and can be applied to a single-column cable tower, reducing the footprint of the lower structure and the impact on flood discharge and navigation. The separated steel box girder forms a lighter and more transparent visual effect by separating the left and right sections, and can coexist harmoniously with the surrounding natural environment, thereby enhancing the landscape value of the bridge.

[0024] 2. A separated steel box girder structure of the present invention connects the separated steel box girders through a transverse connecting box, thereby enhancing the overall stability of the steel box girder. The increase in the overall transverse width improves the transverse stiffness and torsional stiffness of the steel box girder section, significantly improves the flutter stability of the main beam, and ensures the safe operation of the bridge.

[0025] 3. A separated steel box girder structure of the present invention has a wind nozzle arranged on the outside of the steel box girder, a vortex isolation plate arranged on the inside, and multiple lower stabilizing plates arranged longitudinally at the bottom of the transverse connection box at the central separation position, which helps to improve the aerodynamic performance of the steel box girder, reduce the vibration caused by wind load, and improve the wind resistance stability of the bridge. The vortex isolation plate on the inside of the steel box girder helps to weaken the large-scale vortex at the slot, effectively control the vortex-induced vibration of the bridge, and reduce the vibration response caused by the vortex; the unique shape of the wind nozzle can guide the wind flow, allowing it to pass through the bridge more smoothly, thereby reducing wind resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view of the structure at a non-hanging point of a separated steel box girder structure according to an embodiment of the present invention;

[0027] Figure 2 This is a structural cross-sectional view of a separate steel box girder structure at a hanging point according to an embodiment of the present invention;

[0028] Figure 3 It is a plan view of a transverse connection box of a separated steel box girder structure according to an embodiment of the present invention;

[0029] Figure 4 A cross-sectional view of a transverse connection box of a separated steel box girder structure according to an embodiment of the present invention;

[0030] Figure 5 This is a structural frame diagram of a separated steel box girder structure according to an embodiment of the present invention;

[0031] Figure 6 A three-dimensional structural diagram of a separated steel box girder structure according to an embodiment of the present invention;

[0032] Figure 7 The present invention is a flowchart of a construction method of a separated steel box girder structure according to an embodiment of the present invention.

[0033] In all the drawings, the same figure marks represent the same technical features, specifically: 1-steel box girder, 11-top plate, 12-outer inclined bottom plate, 13-flat bottom plate, 14-inner inclined bottom plate, 15-first web plate, 16-second web plate, 17-cross partition, 18-first stiffening rib, 2-transverse connecting box, 21-transverse connecting box web, 22-transverse connecting box top plate, 23-transverse connecting box bottom plate, 22-cross partition inside the box, 25-second stiffening rib, 3-reinforcement member, 31-lower stabilizing plate, 32-vortex partition, 4-wind nozzle, 5-cable anchor box. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0038] like Figure 1-6As shown, an embodiment of the present invention provides a separated steel box girder structure, including steel box girders 1 arranged at both ends of the transverse bridge, each steel box girder 1 extends along the longitudinal direction of the bridge deck, and a plurality of transverse connecting boxes 2 are arranged between the steel box girders 1 at both ends of the transverse bridge, and a plurality of lower stabilizing plates 31 are arranged at the bottom of the transverse connecting boxes 2, which extend along the longitudinal direction of the bridge and are arranged parallel to the steel box girder 1, a vortex isolation plate 32 is arranged on the inner side of the steel box girder 1, a wind nozzle 4 is arranged on the outer side of the steel box girder 1, and a cable anchor box 5 is arranged inside the wind nozzle 4. The structure of the present invention enables the steel box girder 1 to bear the main load of the bridge and ensure the longitudinal stability of the bridge. A plurality of transverse connecting boxes 2 are arranged between the steel box girders 1 at both ends of the transverse bridge. The arrangement of the transverse connecting boxes 2 enhances the connectivity between the steel box girders 1 and improves the overall stability of the bridge. At the same time, it also helps to disperse the load and reduce the stress of a single steel box girder 1, thereby extending the service life of the bridge. A wind nozzle 4 is arranged on the outside of the steel box girder 1, a vortex isolation plate 6 is arranged on the inside, and a plurality of lower stabilizing plates 31 are arranged longitudinally at the bottom of the transverse connecting box 2 at the central separation position, which helps to improve the aerodynamic performance of the steel box girder 1, reduce the vibration caused by wind load, and improve the wind resistance stability of the bridge. The vortex isolation plate 32 on the inside of the steel box girder 1 helps to weaken the large-scale vortex at the slot, effectively control the vortex-induced vibration of the bridge, and reduce the vibration response caused by the vortex. The unique shape of the wind nozzle 4 can guide the wind flow so that it passes through the bridge more smoothly, thereby reducing wind resistance. The setting of the wind nozzle 4 makes the incoming flow not directly collide with the steel box girder 1, but divides the incoming flow into two parts, so that it bypasses the structure from the upper and lower surfaces of the section, and the wind speed is reduced during the bypass process, so that the pressure difference between the front and rear surfaces is reduced, thereby improving the wind resistance stability of the bridge.

[0039] like Figure 1-2As shown, the steel box girder 1 includes a top plate 11 arranged at the bottom of the bridge deck, a flat bottom plate 13 is provided at the bottom of the top plate 11, the outer end of the flat bottom plate 13 is connected to one end of the outer inclined bottom plate 12 by welding, the outer inclined bottom plate 12 is inclined, and the connection between the flat bottom plate 13 and the outer inclined bottom plate 12 forms an obtuse angle, the inner end of the flat bottom plate 13 is connected to the inner inclined bottom plate 14 by welding, the inner inclined bottom plate 14 is inclined, and the connection between the flat bottom plate 13 and the inner inclined bottom plate 14 forms an obtuse angle, a first web 15 is fixedly installed between the top plate 11 and the outer inclined bottom plate 12, a second web 16 is provided between the top plate 11 and the inner inclined bottom plate 14, and the top plate 11, the first web The plate 15, the outer inclined bottom plate 12, the flat bottom plate 13, the inner inclined bottom plate 14 and the second web 16 form a closed cavity, and a plurality of transverse diaphragms 17 are arranged at intervals along the longitudinal direction of the bridge inside the steel box girder 1, and the plane where the transverse diaphragms 17 are located is parallel to the cross section of the cavity, and the two ends, the top surface and the bottom surface of the transverse diaphragm 17 are respectively connected to the inner wall of the steel box girder 1 by welding, and a manhole is provided in the middle of the transverse diaphragm 17, which facilitates construction personnel to enter the box girder of the bridge for construction, inspection and maintenance work, and the inner wall of the cavity surrounded by the top plate 11, the first web 15, the outer inclined bottom plate 12, the flat bottom plate 13, the inner inclined bottom plate 14 and the second web 16 is provided with a plurality of first stiffening ribs 18 arranged at intervals. The closed cavity structure formed by the top plate 11, the flat bottom plate 13, the outer inclined bottom plate 12, the inner inclined bottom plate 14, the first web 15 and the second web 16 enhances the overall rigidity and bearing capacity of the steel box girder. The closed cavity structure helps to improve the torsional rigidity of the steel box girder, so that it has better resistance to lateral loads or torque. The closed cavity structure provides a continuous and relatively closed space inside the steel box girder, which is convenient for subsequent maintenance or installation of other equipment. The various components are connected by welding, which reduces the weak links at the connection and improves the overall durability and fatigue resistance of the structure. The first stiffening rib 18 set on the inner wall of the cavity enhances the rigidity and strength of the steel box girder 1, improves the fatigue resistance and prolongs the service life of the bridge. The setting of the diaphragm 17 not only enhances the longitudinal rigidity of the box girder, but also provides convenience for support and fixation during the construction process. The welding connection between the diaphragm 17 and the inner wall of the box girder simplifies the construction process and improves the construction efficiency. The closed cavity structure facilitates regular inspection and maintenance, reducing maintenance costs.

[0040] Furthermore, if Figure 5 As shown, the angle between the outer inclined bottom plate 12 and the horizontal is 16.7°, and the angle between the inner inclined bottom plate 14 and the horizontal is 22.62°, which helps to reduce the wind resistance coefficient of the main beam, improve the wind resistance of the main beam, and help reduce the lateral force of the wind on the bridge. By increasing the inclination angle of the inner inclined bottom plate, the conditions for the generation of vortex-vibration can be destroyed, thereby improving the anti-vortex-vibration performance of the bridge.

[0041] like Figure 2-4 As shown, a plurality of transverse connection boxes 2 are arranged between the steel box girders 1 along the longitudinal direction of the bridge, and the transverse connection boxes 2 include a transverse connection box top plate 22, which is flush with the top surfaces of the steel box girders 1 on both sides, and a transverse connection box bottom plate 23 is arranged at the bottom of the transverse connection box top plate 22, and a transverse connection box web 21 is arranged between the transverse connection box top plate 22 and the transverse connection box bottom plate 23, and the transverse connection box top plate 22, the transverse connection box bottom plate 23 and the transverse connection box web 21 form a closed cavity, and the transverse connection box web 21 corresponds one by one to the transverse diaphragm 17 inside the steel box girder 1, and the transverse connection box top plate 22, the transverse connection box bottom plate 23 and the transverse connection box web 21 form a closed cavity, and the transverse connection box web 21 corresponds one by one to the transverse diaphragm 17 inside the steel box girder 1. The setting of the connecting box 2 connects multiple steel box girders into a whole along the longitudinal direction of the bridge, which significantly improves the integrity and stability of the bridge structure, helps to resist external loads, especially lateral loads (such as wind loads, earthquake loads, etc.), thereby improving the earthquake and wind resistance of the bridge, and helps to evenly distribute the load to each steel box girder 1, thereby improving the bearing capacity of the bridge. The closed cavity structure inside the transverse connecting box 2 is convenient for regular maintenance inspection and cleaning, which helps to timely discover and deal with potential safety hazards and ensure the normal operation of the bridge. The transverse connecting box 2 adopts a welding connection method to improve the integrity and durability of the structure.

[0042] A plurality of in-box transverse partitions 22 are arranged at longitudinal intervals inside the transverse connecting box 2, and the plane where the in-box transverse partitions 22 are located is parallel to the cross section of the cavity. The two ends, the top surface and the bottom surface of the in-box transverse partitions 22 are respectively connected to the inner wall of the transverse connecting box 2 by welding. A manhole is arranged in the middle of the in-box transverse partition 22, and the manhole facilitates construction personnel to enter the box girder of the bridge for construction, inspection and maintenance work. The inner wall of the cavity surrounded by the transverse connecting box top plate 22, the transverse connecting box bottom plate 23 and the transverse connecting box web 21 is provided with a plurality of second stiffening ribs 25 arranged at intervals. The closed cavity structure inside the transverse connecting box 2 and the setting of the transverse diaphragm 22 inside the box help to optimize the stress distribution inside the bridge and reduce stress concentration, which can not only improve the bearing capacity of the bridge, but also extend the service life of the bridge. The transverse connecting box 2 provides additional torsional stiffness for the bridge through its closed cavity and the transverse diaphragm 22 inside the box. When the bridge is subjected to torque, the transverse connecting box 2 can effectively resist torsional deformation and ensure the stability and safety of the bridge. The various components of the transverse connecting box 2 (top plate, bottom plate, web plate, transverse diaphragm, etc.) are connected by welding, which simplifies the construction process and improves construction efficiency.

[0043] like Figure 1-2As shown, the reinforcing member 3 includes a lower stabilizing plate 31 and a vortex isolating plate 32. The vortex isolating plate 32 is fixedly installed on the inner side of the steel box girder 1, and its top surface is flush with the top surface of the steel box girder 1. A plurality of lower stabilizing plates 31 are fixedly installed at the bottom of the transverse connecting box 2, which extend along the longitudinal direction of the bridge and are arranged in parallel with the steel box girder 1. The lower stabilizing plate 31 and the vortex isolating plate 32 help to improve the aerodynamic performance of the steel box girder 1, reduce the vibration caused by wind load, and improve the wind resistance stability of the bridge. The vortex isolating plate 32 effectively controls the vortex-induced vibration of the bridge by weakening the large-scale vortex at the slot, and reduces the vibration response caused by vortex. The lower stabilizing plate 31 and the vortex isolating plate 32 change the airflow characteristics on the inner side of the steel box girder 1, reduce the generation of vortex, thereby reducing the lift fluctuation caused by vortex, and reducing the vertical and torsional vortex vibration of the bridge. The lower stabilizing plate 31 extends along the longitudinal direction of the bridge and is arranged in parallel with the steel box girder 1, which enhances the longitudinal stability of the structure and improves the overall stiffness and bearing capacity of the steel box girder 1. By setting the lower stabilizing plate 31 and the vortex isolating plate 32, the vibration caused by wind load can be reduced, driving comfort and safety can be improved, and fatigue damage to the bridge caused by vibration can be reduced. Reasonable setting of the lower stabilizing plate 31 and the vortex isolating plate 32 can optimize the material usage and improve economic benefits without sacrificing structural performance. At the same time, the setting of these components also helps to improve the durability of the bridge and reduce maintenance costs.

[0044] The steel box girder 1 is provided with a tuyere 4 on the outside, and the tip part thereof is usually made into a triangle, a circle or a pointed circle. A cable anchor box 5 is provided inside the tuyere 4; the cable anchor box 5 is used to connect the bridge tower with the steel box girder 1 through the cable, so as to transmit the force on the steel box girder 1 to the cable tower structure. The unique shape of the tuyere 4 can guide the wind flow, so that it can pass through the bridge more smoothly, thereby reducing wind resistance. The setting of the tuyere 4 makes the incoming flow not directly collide with the steel box girder 1, but divides the incoming flow into two parts, so that it bypasses the structure from the upper and lower surfaces of the cross section, and the wind speed is reduced during the bypass process, so that the pressure difference between the front and rear surfaces is reduced, which can not only improve the stability of the bridge in the wind, but also reduce the destructive effect of wind on the bridge. By reducing the impact of wind on the bridge, wind nozzles help maintain the overall stability of the bridge and increase the critical wind speed of bridge flutter, thereby improving flutter stability; wind nozzles control forced vibrations and suppress vortex-induced resonance, reducing structural fatigue on the bridge body, affecting the comfort and safety of driving on the bridge, helping to reduce the impact of structural fatigue on bridge quality and ensure driving safety on the bridge.

[0045] Furthermore, if Figure 5The above-mentioned inclined cable anchor box 5 and transverse connection box 2 are located at the same cross-sectional position of the steel box girder 1. The inclined cable anchor box is the connection point between the inclined cable and the steel box girder, and bears huge tension; while the transverse connection box is responsible for connecting the steel box girders on the left and right sides to improve the lateral stability. The two are located at the same position, which can form a more solid structural system to jointly resist external loads and deformation. The tension of the inclined cable is directly transmitted to the steel box girder through the anchor box, and the transverse connection box ensures that the load between the steel box girders on the left and right sides is evenly distributed.

[0046] Combination Figure 1-5 ,like Figure 6 As shown, the present invention provides a construction method of a separated steel box girder structure, comprising the following steps:

[0047] S100: In a factory or construction site, a transverse connection box 2, a reinforcing member 3, a tuyere 4 and a stay cable anchor box 5 are manufactured according to the design drawings;

[0048] S200: Divide the steel box girder 1 into multiple sections for manufacturing according to the design drawings, ensure that the size and shape of the components meet the design requirements, and fix the transverse connection box 2, the reinforcement component 3, the air nozzle 4 and the inclined cable anchor box 5 on the corresponding steel box girder 1 section;

[0049] S300: transport the assembled steel box girder 1 segment to the construction site, take a segment of the steel box girder 1, use a crane to lift the steel box girder 1 segment to a predetermined position, use measuring equipment to accurately position it to ensure safe and accurate installation, use welding to connect the current segment with the previous segment, and after the connection is completed, tighten and inspect it to ensure that the connection is firm and reliable;

[0050] S400: Take another segment of the steel box girder 1, use a crane to hoist the segment of the steel box girder 1 to a predetermined position, use a measuring device to accurately position it to ensure safe and accurate installation, and use welding to connect the segment to the previous segment. After the connection is completed, tighten and inspect it to ensure that the connection is firm and reliable;

[0051] S500: Repeat step S400 until all steel box girder 1 sections are constructed.

[0052] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A separated steel box girder structure, characterized in that: include: A steel box girder (1) provided at both ends of the transverse bridge, comprising a top plate (11) provided at the bottom of the bridge deck, a flat bottom plate (13) provided at the bottom of the top plate (11), an outer end of the flat bottom plate (13) being fixedly connected to one end of an outer inclined bottom plate (12), an inner end of the flat bottom plate (13) being fixedly connected to one end of an inner inclined bottom plate (14), a first web plate (15) being fixedly installed between the top plate (11) and the outer inclined bottom plate (12), a second web plate (16) being provided between the top plate (11) and the inner inclined bottom plate (14), and the top plate (11), the first web plate (15), the outer inclined bottom plate (12), the flat bottom plate (13), the inner inclined bottom plate (14) and the second web plate (16) forming a closed cavity; A reinforcing member (3), comprising a lower stabilizing plate (31) and a vortex isolation plate (32), wherein the vortex isolation plate (32) is fixedly mounted on the inner side of the steel box girder (1), and its top surface is flush with the top surface of the steel box girder (1); a plurality of lower stabilizing plates (31) are fixedly mounted on the bottom of the transverse connecting box (2), extending along the longitudinal direction of the bridge and arranged in parallel with the steel box girder (1); And a transverse connection box (2) arranged between the steel box girders (1) at both ends of the transverse bridge, comprising a transverse connection box top plate (22), a transverse connection box bottom plate (23) being arranged at the bottom of the transverse connection box top plate (22), a transverse connection box web plate (21) being arranged between the transverse connection box top plate (22) and the transverse connection box bottom plate (23), and the transverse connection box top plate (22), the transverse connection box bottom plate (23) and the transverse connection box web plate (21) forming a closed cavity.

2. The separated steel box girder structure according to claim 1, characterized in that: A plurality of transverse partitions (17) are arranged inside the steel box girder (1) at intervals along the longitudinal direction of the bridge, the plane where the transverse partitions (17) are located is parallel to the cross section of the cavity, and the two ends, top surface and bottom surface of the transverse partition (17) are respectively connected to the inner wall of the steel box girder (1) by welding.

3. A separated steel box girder structure according to claim 2, characterized in that: The inner wall of the cavity surrounded by the top plate (11), the first web plate (15), the outer inclined bottom plate (12), the flat bottom plate (13), the inner inclined bottom plate (14) and the second web plate (16) is provided with a plurality of first stiffening ribs (18) arranged at intervals.

4. The separated steel box girder structure according to claim 1, characterized in that: A plurality of in-box transverse partitions (22) are arranged at longitudinal intervals inside the transverse connection box (2), and the plane where the in-box transverse partitions (22) are located is parallel to the cross section of the cavity.

5. The separated steel box girder structure according to claim 4, characterized in that: The inner wall of the cavity surrounded by the transverse connection box top plate (22), the transverse connection box bottom plate (23) and the transverse connection box web plate (21) is provided with a plurality of second stiffening ribs (25) arranged at intervals.

6. A separated steel box girder structure according to any one of claims 1 to 5, characterized in that: The transverse connecting box web (21) corresponds one to one with the transverse partition (17) inside the steel box beam (1).

7. A separated steel box girder structure according to any one of claims 1 to 5, characterized in that: The angle between the outer inclined bottom plate (12) and the horizontal is 16.7°, and the angle between the inner inclined bottom plate (14) and the horizontal is 22.62°.

8. A separated steel box girder structure according to any one of claims 1 to 5, characterized in that: The outer side of the steel box girder (1) is provided with a tuyere (4), and the interior of the tuyere (4) is provided with a stay cable anchor box (5).

9. The separated steel box girder structure according to claim 8, characterized in that: The stay cable anchor box (5) and the transverse connection box (2) are located at the same cross-sectional position of the steel box girder (1).

10. A construction method of a separated steel box girder structure according to any one of claims 1 to 9, characterized in that: The steps include: S100: In a factory or a construction site, a transverse connection box (2), a reinforcing member (3), a tuyere (4) and a stay cable anchor box (5) are manufactured according to design drawings; S200: Divide the steel box girder (1) into a plurality of sections for manufacturing according to the design drawings, ensure that the size and shape of the components meet the design requirements, and fix the transverse connection box (2), the reinforcement component (3), the air nozzle (4) and the inclined cable anchor box (5) on the corresponding steel box girder (1) section; S300: transporting the assembled steel box girder (1) segment to the construction site, taking a segment of the steel box girder (1), using a crane to lift the steel box girder (1) segment to a predetermined position, using a measuring device to accurately position it to ensure safe and accurate installation, and connecting the segment to the previous segment by welding. After the connection is completed, tightening and inspecting are performed to ensure that the connection is firm and reliable; S400: Take another segment of the steel box girder (1), use a crane to lift the segment of the steel box girder (1) to a predetermined position, use a measuring device to accurately position it to ensure safe and accurate installation, and use welding to connect the segment to the previous segment. After the connection is completed, tighten and inspect it to ensure that the connection is firm and reliable; S500: Repeat step S400 until all steel box girder (1) sections are constructed.

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