Continuous steel box girder structure and transverse translation pushing beam replacement construction method thereof

Abstract

The invention relates to the field of railway bridge engineering, and provides a continuous steel box girder structure suitable for a turnout throat area bridge and a transverse translation pushing beam changing construction method of the continuous steel box girder structure. The continuous steel box girder is of a single-box multi-chamber structure and adapts to the bridge widening design through widening of the box chambers, and the closed section guarantees the overturning resistance and the overall stability of a girder body. Longitudinal U-shaped stiffening ribs are arranged on a top plate and a bottom plate, longitudinal plate ribs are arranged on a flange plate and a web plate of the top plate, and transverse partition plates, beam body supports, slide way supports and supporting stiffening ribs are further arranged. During construction, an assembling jig frame is erected outside an existing railway operation red line, after box girder sections prefabricated in a factory are assembled on site, the existing girder is ejected out through the transverse pushing sliding way, then a new girder is synchronously pushed, and girder replacement is completed. The method effectively solves the problem of beam replacement of the conventional prestressed concrete turnout continuous beam, has the advantages of light structure dead weight, convenience in construction, small interference, remarkable benefit and the like, and provides a reliable technical scheme for upgrading and reconstruction of a railway turnout throat area and access of a newly-built railway.

Description

Technical Field

[0001] The invention belongs to the field of railway bridge engineering, and in particular relates to a continuous steel box girder structure suitable for a turnout throat area bridge and a transverse translation, jacking and beam replacement construction method thereof. Background Art

[0002] The connection of a new railway to an existing operating railway is usually achieved by widening the operating roadbed, adding turnouts and station lines. However, as the proportion of bridges on domestic operating railways increases, especially the proportion of bridges on high-speed railways, intercity railways, and urban railways, the demand for bridges connecting new railways to operating railways is gradually increasing due to the objective conditions of urban development planning and the requirements of road network planning.

[0003] At present, the bridges in the throat area of ​​railway turnouts are usually cast-in-place with variable width prestressed concrete continuous beams, which greatly limits the upgrading and reconstruction of the throat area of ​​railway turnouts and the access to new railways. From the technical solutions disclosed in relevant domestic and foreign materials, due to the restrictions on the requirements of railway turnouts on bridge structures, in order to achieve the upgrading and reconstruction of the throat area of ​​railway turnouts and the access to new railways, it is usually necessary to carry out the overall beam replacement construction of the turnout bridge.

[0004] The existing railway turnout throat area bridge structure and beam replacement construction technology have the following technical defects:

[0005] Conventional prestressed concrete turnout continuous beams have a heavy structure, and construction technologies such as prefabrication, hoisting, and jacking beam replacement are difficult to apply, and the construction period is long.

[0006] Conventional prestressed concrete turnout continuous beams have relatively weak material properties. Under the action of local jacking force, concrete cracking is prone to occur, affecting their normal performance.

[0007] Conventional prestressed concrete turnout continuous beams have a heavy structure, and the required jacking force is relatively large during the jacking and beam replacement operations, making it difficult to implement jacking and beam replacement for long continuous beams.

[0008] Limited by the upgrading and renovation of railway turnout throat areas and the construction requirements for overall bridge beam replacement for new railway access, the implementation of conventional prestressed concrete turnout continuous beam replacement is difficult, which greatly limits the engineering application of new railway access to existing railway bridges. Summary of the invention

[0009] The present invention aims to resolve the contradiction between the difficulty in replacing the continuous beams of conventional prestressed concrete turnouts and the actual demand for replacing the beams when a new railway is connected to an existing railway bridge, and to provide a continuous steel box girder structure suitable for a bridge in the throat area of ​​a turnout and a method for lateral translation and jacking to replace the beams, so as to realize the convenient connection of the new railway to the existing railway bridge and promote the upgrading and reconstruction of the throat area of ​​the railway turnout.

[0010] In order to achieve the above-mentioned objectives, the present invention provides, on the one hand, a continuous steel box girder structure suitable for throat area bridges, wherein the continuous steel box girder adopts a closed single-box multi-chamber structure, and adapts to the widening design of the turnout throat area bridge by widening the box chamber, and the closed single-box multi-chamber section is used to provide the beam body with anti-overturning performance and overall stability; the continuous steel box girder includes a top plate, a bottom plate, a middle web plate and an outer web plate, longitudinal U-shaped stiffening ribs are arranged on the top plate and the bottom plate, the top plate has a top plate flange plate extending outward, the top plate has a flange plate longitudinal plate ribs arranged on the top plate flange plate, and the web longitudinal plate ribs are arranged on the middle web plate and the outer web plate.

[0011] Furthermore, the beam body supports include edge supports arranged at the edges of the box beam structure and middle supports arranged at the middle of the box beam structure.

[0012] Furthermore, a plurality of transverse partitions are arranged in the longitudinal direction in the continuous steel box girder, and transverse partition stiffening ribs and manholes are provided on the transverse partitions.

[0013] Furthermore, there is a support steel plate at the support position of the slideway, and a local pressure-bearing support stiffening rib is welded at a position corresponding to the support steel plate.

[0014] Another aspect of the present invention further provides a method for constructing a lateral translation and jacking beam replacement of the continuous steel box beam as described above, comprising the following steps:

[0015] S1, erect the assembly frame of the continuous steel box girder at a position parallel to the existing beam and outside the existing railway operation management red line;

[0016] S2, transport the continuous steel box girder prefabricated in the factory to the site by car, use the truck crane to hoist each segment onto the assembly frame and complete the connection between the segments;

[0017] S3, set up a transverse push slideway under the continuous steel box girder and the existing beam;

[0018] S4, first push the existing beam out of the line along the horizontal direction, and then simultaneously push the continuous steel box beam to the specified position to realize the beam replacement.

[0019] Furthermore, the overall construction process of jacking-type beam replacement includes: erecting an assembly cradle and assembling continuous steel box girders on site; constructing a jacking slideway under the continuous steel box girders; replacing the assembled continuous steel box girders from the assembly cradle to the jacking slideway; continuing to construct the remaining jacking slideways; installing the towing-type jacking equipment of the original bridge and the jacking-type jacking equipment of the continuous steel box girders; using the towing method to drag the original bridge laterally from its original position to the beam storage area; simultaneously using the jacking method to jack the continuous steel box girders laterally from the assembly cradle to the designed position; after fine-tuning the position of the continuous steel box girders, replacing them from the jacking slideway to the permanent support; dismantling the jacking slideway and the towing and jacking equipment used for transverse beam replacement; completing the smooth connection of the continuous steel box girder with the existing bridges at both ends; debugging the line after the transverse beam replacement is completed, and opening for operation after debugging is completed.

[0020] Furthermore, before the continuous steel box girder is pushed, a jacking jack is installed between the reaction back on the pushing slide and the reaction bullneck of the steel distribution beam at the bottom of the beam. The jacking jack is a hydraulic jacking jack with a base flange and connected to the reaction bullneck of the steel distribution beam at the bottom of the continuous steel box girder. The hydraulic jacking jack slides with the continuous steel box girder, and one end of the hydraulic jacking jack piston rod is connected to the automatic reaction shear seat, which provides reaction force by plugging and unplugging the reaction back of the automatic reaction shear seat. During the pushing construction, the pushing is stopped every one meter and the cylinder is accurately retracted to the next section of the reaction slot.

[0021] Another aspect of the present invention provides a railway bridge, wherein the turnout throat area of ​​the railway bridge adopts the above-mentioned continuous steel box girder structure.

[0022] Beneficial Effects

[0023] Structural advantages: The continuous steel box girder structure has a light weight, which greatly reduces the construction difficulty of prefabrication, hoisting and top-pushing beam replacement compared to conventional prestressed concrete turnout continuous beams. The variable-width single-box multi-chamber section can not only adapt well to the variable-width design of the bridge in the turnout throat area, but also has excellent torsional rigidity, effectively meeting the anti-overturning performance and overall stability requirements of the beam body, and effectively ensuring the driving safety in the railway turnout area. Support stiffening ribs are welded at local locations such as top-pushing and temporary support to meet the local stability requirements of the steel beam.

[0024] Construction advantages: The continuous steel box girder can be prefabricated in sections in the factory and then assembled on the on-site frame. This construction method greatly shortens the construction period and facilitates the smooth implementation of the beam replacement construction. The horizontal translation and jacking beam replacement construction method is operated outside the existing railway operation management red line, reducing interference with railway operations. First, the existing beam is pushed out horizontally, and then the continuous steel box girder is pushed synchronously. The beam replacement construction is easy and has low risk.

[0025] Comprehensive benefits: The present invention successfully solves the technical difficulties in connecting a new railway to an existing railway bridge, making the connection of a new railway to an existing railway bridge more convenient and efficient, with significant social and economic benefits, and provides reliable technical support for the upgrading and reconstruction of railway turnout throat areas and the connection of new railways. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the plan layout of the top plate of the continuous steel box girder of the present invention;

[0027] Figure 2 It is a typical cross-sectional schematic diagram of the continuous steel box girder of the present invention;

[0028] Figure 3 It is a schematic diagram of the planar layout of the bottom plate of the continuous steel box girder of the present invention;

[0029] Figure 4 It is a schematic diagram of the supporting stiffening rib structure of the local pressure-bearing area of ​​the continuous steel box girder of the present invention;

[0030] Figure 5 It is a schematic diagram of on-site assembly of the continuous steel box girder of the present invention;

[0031] Figure 6 It is a schematic diagram of the horizontal translation and pushing replacement of the continuous steel box girder of the present invention;

[0032] Figure 7 It is a transverse schematic diagram of the transverse translation and pushing replacement of the continuous steel box girder of the present invention;

[0033] Figure 8 This is a diagram of the equipment for horizontal translation and pushing beam replacement of continuous steel box beams of the present invention.

[0034] Explanation of the reference numerals in the figures: 1: continuous steel box girder; 2: top plate; 3: top plate flange plate; 4: bottom plate; 5: middle web plate; 6: outer web plate; 7: longitudinal U-shaped stiffening rib; 8: longitudinal plate rib of top plate flange plate; 9: longitudinal U-shaped stiffening rib of bottom plate; 10: longitudinal plate rib of web plate; 11: box type of continuous steel box girder; 12: transverse diaphragm; 13: transverse diaphragm stiffening rib; 14: manhole; 15: support steel plate; 16: local pressure bearing stiffening rib; 17: slideway support position ; 18: Side support; 19: Middle support; 20: Assembly cradle; 21: Steel pipe pile column of the assembly cradle of the continuous steel box girder; 22: Pushing slide; 23: Existing bridge; 24: Existing bridge (original position); 25: Existing bridge (position of the beam after pushing); 26: Drag jack; 27: Jacking jack; 28: Steel distribution beam at the bottom of the beam; 29: Reaction bracket; 30: Reaction back; 31: Automatic reaction shear seat of the jack; 32: Reaction slot. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0037] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0038] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0039] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0040] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0042] The present invention provides a continuous steel box girder structure suitable for a bridge in a turnout throat area and a transverse translation and pushing beam replacement construction method thereof, and the specific implementation methods are as follows:

[0043] 1. Implementation of continuous steel box girder structure

[0044] Overall structural design: In a railway turnout throat area bridge project, the long-jointed turnout continuous beam adopts a single-box multi-chamber continuous steel box beam structure. According to the widening requirements of the turnout throat area bridge, the box chamber widening design is adapted. The closed single-box multi-chamber cross-section design effectively improves the anti-overturning performance and overall stability of the beam body, ensuring the safe operation of the turnout area train. Figure 1 As shown, Figure 1 The top plate layout diagram of the continuous steel box girder is shown in FIG. 2 , which shows the top plate 2 layout of the continuous steel box girder 1. The middle web plate (5) and the outer web plate 6 are distributed below the top plate, which together with the top plate form a plurality of box structures 11. In addition, a plurality of transverse diaphragms 12 are arranged along the longitudinal direction of the steel box girder to enhance the stability of the structure. Figure 2 As shown in the figure, a typical cross section of a continuous steel box girder is shown, and it can be seen that the continuous steel box girder is composed of a top plate 2, a top plate flange plate 3, a bottom plate 4, a middle web plate 5 and an outer web plate 6. In order to enhance the structural performance, the top plate is provided with longitudinal U-shaped stiffening ribs 7, the top plate flange plate is provided with longitudinal plate ribs 8, the bottom plate is provided with longitudinal U-shaped stiffening ribs 9, and the web plate is provided with longitudinal plate ribs 10. These stiffening ribs and plate ribs effectively improve the stress stability of the steel beam.

[0045] Figure 3 The figure is a schematic diagram of the bottom plate layout of the continuous steel box girder of the present invention. The bottom plate 4 of the continuous steel box girder 1 can be seen in the figure, which is divided into multiple boxes 11 by the middle web 5 and the outer web 6. Multiple slideway support positions 17 are marked on the bottom plate to provide support during the construction jacking process. Side supports 18 are set at both ends, and a middle support 19 is arranged in the middle. These supports play a key role in the stable support of the steel box girder.

[0046] At the same time, a transverse partition is set at a certain distance along the longitudinal direction of the steel beam to effectively limit the cross-sectional distortion of the steel beam and ensure the structural stability of the steel beam. Figure 4 The present invention shows the supporting stiffening rib structure of the local pressure-bearing area of ​​the continuous steel box girder. The figure shows the diaphragm 12 of the continuous steel box girder, on which the stiffening ribs 13 of the diaphragm are arranged to enhance the stability of the diaphragm. There is also a manhole 14 on the diaphragm for easy passage and maintenance. Below the diaphragm is a support steel plate 15, on which the local pressure-bearing supporting stiffening ribs 16 are welded at the corresponding key positions to meet the force requirements of the local pressure-bearing of the steel beam.

[0047] 2. Implementation of continuous steel box girder assembly construction

[0048] In the area where the existing beams are horizontally parallel and outside the existing railway operation management red line, the steel pipe pile columns 21 of the continuous steel box beam assembly frame are first installed, and then the assembly frame 20 is set on the steel pipe pile columns. After the continuous steel box beam 1 is prefabricated in sections in the factory, it is transported to the construction site by car. The prefabricated sections are hoisted onto the assembly frame section by section by a truck crane, and the connection between the sections is completed through precise positioning and welding and other connection processes, so as to realize the on-site assembly of the continuous steel box beam. The on-site assembly is shown in the attached figure. Figure 5 shown.

[0049] 3. Implementation of the horizontal translation and pushing beam replacement construction method

[0050] Slideway construction: Under the continuous steel box girder and the existing beam, a transverse jacking slideway 22 is constructed according to the design requirements to provide basic conditions for beam replacement construction.

[0051] Beam replacement steps

[0052] When replacing beams, the dragging method is first used. Using the installed dragging equipment, the existing beams are slowly pushed out of the line position in the horizontal direction to the pre-set beam storage area.

[0053] At the same time, the jacking method is used to push the assembled continuous steel box girder to the designated position to complete the jacking and beam replacement operation. The specific beam replacement diagram is shown in the attached figure. Figure 6-7 shown.

[0054] Overall construction process

[0055] Erection of assembly cradle and assembly of steel box girder: In a suitable site that is horizontally parallel to the existing beams and outside the existing railway operation management red line, a stable assembly cradle 21 is erected according to precise construction design. The cradle must have sufficient strength, rigidity and stability to bear the weight of the continuous steel box girder and various loads during the construction process. After the continuous steel box girder is prefabricated in sections in the factory according to strict process standards, it is safely transported to the construction site by special transport vehicles. Subsequently, using large-scale truck crane equipment, the steel box girder is hoisted onto the assembly cradle 21 section by section according to the pre-planned hoisting sequence, and high-precision connection processes, such as welding or high-strength bolt connections, are used to complete the precise connection between sections, thereby realizing the on-site assembly of the continuous steel box girder.

[0056] Construction of the top-pushing slideway (early stage): After the on-site assembly of the continuous steel box girder is completed, the top-pushing slideway below the continuous steel box girder will be constructed. The construction personnel need to process the slideway foundation according to the design requirements to ensure that it has uniform and sufficient load-bearing capacity. Then, the main structure of the slideway, including the slideway beam, slider and other components, is laid according to the precise size and slope to provide a reliable sliding track for the subsequent top-pushing of the steel box girder.

[0057] Steel box girder underpinning: After the initial construction of the top-pushing slideway under the continuous steel box girder is completed, professional underpinning equipment and technology are used to smoothly underpin the assembled continuous steel box girder from the assembly frame to the top-pushing slideway 22. During the underpinning process, the posture and stress of the steel box girder need to be closely monitored to ensure that the underpinning process is safe and smooth, and to avoid damage to the steel box girder structure.

[0058] Construction of the jacking slideway (remaining part): After the steel box girder is successfully replaced on the jacking slideway 22, the construction of the remaining jacking slideway is continued. This includes further improvement and reinforcement of the slideway, such as installing the limit device and lubrication system of the slideway, so as to ensure that the steel box girder can accurately slide along the predetermined track during the jacking process, while reducing the sliding resistance.

[0059] Installation of jacking equipment: According to the construction plan, the jacking equipment of the original bridge by pulling method and the jacking equipment of the continuous steel box girder by jacking method are installed at appropriate locations. These equipments need to undergo strict commissioning and inspection to ensure their reliable performance and stable operation, and can meet the construction requirements of bridge pulling and steel box girder jacking.

[0060] Towing of existing bridges: After all preparations are completed, start the towing and pushing equipment of the original bridge, and slowly and horizontally tow the existing bridge from its original position to the beam storage area according to the pre-set towing plan and speed. During the towing process, it is necessary to monitor the displacement, deformation and stress of the bridge in real time, and adjust the parameters of the towing equipment in time to ensure that the existing bridge reaches the designated position of the beam storage area safely and accurately.

[0061] Continuous steel box girder jacking: When the existing bridge is successfully dragged to the beam storage area, the continuous steel box girder jacking equipment is started synchronously to jack the continuous steel box girder horizontally from the location of the assembly frame to the designed position. During the jacking process, the speed and direction of the jacking must be strictly controlled, and the precise measurement and monitoring system must be used to ensure that the continuous steel box girder is accurately positioned and the deviation from the designed position is within the allowable range.

[0062] Fine-tuning and underpinning of steel box girders to permanent supports: When the continuous steel box girder is pushed to the designed position, its position is precisely adjusted to make its various parameters meet the design requirements. After fine-tuning, professional underpinning equipment is used again to smoothly underpin the continuous steel box girder from the jacking slideway to the permanent support to complete the final positioning of the steel box girder.

[0063] Equipment removal: After the continuous steel box girder is successfully replaced on the permanent support and all tests are qualified, the jacking slide, transverse beam replacement traction and jacking equipment are removed in accordance with the safety operation procedures. During the removal process, attention should be paid to the protection and recycling of the equipment, while ensuring the cleanliness and safety of the construction site.

[0064] Bridge connection: After the equipment is dismantled, the continuous steel box girder will be connected to the existing bridges at both ends. This includes the construction of the bridge structure connection, bridge deck paving, and auxiliary facilities installation to ensure a smooth transition between the new and old bridges and meet the requirements for safe and stable train operation.

[0065] Line debugging and operation opening: After the bridge connection work is completed, the line after the horizontal push beam replacement is fully debugged, including track geometry adjustment, signal system testing, power supply system debugging, etc. After strict testing and inspection to ensure that all indicators of the line meet relevant standards and specifications, it is officially opened for operation.

[0066] Operation of jacking equipment: The specific structure of jacking equipment is as shown in the attached Figure 8 As shown, before the continuous steel box girder is pushed, a hydraulic jacking jack 27 is installed between the reaction back on the pushing slideway and the steel distribution beam 28 and the reaction bull leg 29 at the bottom of the beam. The jack has a base flange and is firmly connected to the reaction bull leg of the steel distribution beam at the bottom of the continuous steel box girder. It slides with the continuous steel box girder during the pushing process. One end of the piston rod of the hydraulic jacking jack is connected to the automatic reaction shear seat 31, and the reaction back 30 of the automatic reaction shear seat 31 is plugged in and out to provide reaction force, so as to realize the sliding of the continuous pushing of the new steel beam. During the pushing construction, the pushing is stopped every time one meter is pushed forward, and the cylinder is accurately closed to the next section of the reaction slot 32.

[0067] Through the above specific implementation methods, the practical problems of the difficulty in replacing the continuous beams of conventional prestressed concrete turnouts and the replacement of beams for the access of new railways to existing railway bridges are effectively solved, providing a reliable technical solution for the upgrading and reconstruction of the throat area of ​​railway turnsouts and the access of new railways.

[0068] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A continuous steel box girder structure suitable for throat area bridges, characterized in that: The continuous steel box girder adopts a closed single-box multi-chamber structure, which adapts to the widening design of the bridge in the turnout throat area by widening the box chamber, and the closed single-box multi-chamber section is used to provide the beam body with anti-overturning performance and overall stability; the continuous steel box girder includes a top plate, a bottom plate, a middle web plate and an outer web plate, and longitudinal U-shaped stiffening ribs are arranged on the top plate and the bottom plate. The top plate has a top plate flange plate extending outward, and flange plate longitudinal plate ribs are arranged on the top plate flange plate, and web plate longitudinal plate ribs are arranged on the middle web plate and the outer web plate.

2. The continuous steel box girder structure suitable for turnout throat bridge according to claim 1 is characterized in that: The continuous steel box girder is provided with a beam body support and a slideway support position at corresponding positions of the bottom plate, and is welded with supporting stiffening ribs.

3. The continuous steel box girder structure suitable for the turnout throat bridge according to claim 2 is characterized in that: The beam body supports include edge supports arranged at the edges of the box beam structure and middle supports arranged at the middle of the box beam structure.

4. The continuous steel box girder structure suitable for turnout throat bridge according to claim 1 is characterized in that: A plurality of transverse diaphragms are arranged in the longitudinal direction in the continuous steel box girder, and transverse diaphragm stiffening ribs and manholes are arranged on the transverse diaphragms.

5. The continuous steel box girder structure suitable for turnout throat bridge according to claim 2 is characterized in that: A support steel plate is arranged at the support position of the slideway, and a local pressure-bearing support stiffening rib is welded at a position corresponding to the support steel plate.

6. A method for constructing a lateral translation and jacking beam replacement of a continuous steel box beam as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1, erect the assembly frame of the continuous steel box girder at a position parallel to the existing beam and outside the existing railway operation management red line; S2, transport the continuous beam and box beam prefabricated in the factory in sections to the site by car, use a truck crane to hoist each section onto the assembly frame and complete the connection between sections; S3, set up a transverse push slideway under the continuous steel box girder and the existing beam; S4, first push the existing beam out of the line along the horizontal direction, and then simultaneously push the continuous steel box beam to the specified position to realize the beam replacement.

7. The method for replacing beams by lateral translation and pushing of continuous steel box beams according to claim 6 is characterized in that: The overall construction process of jacking-up beam replacement includes: erecting the assembly cradle and assembling the continuous steel box girder on site; constructing the jacking-up slideway under the continuous steel box girder; transferring the assembled continuous steel box girder from the assembly cradle to the jacking-up slideway; continuing to construct the remaining jacking-up slideways; installing the traction-based jacking equipment of the original bridge and the jacking-based jacking equipment of the continuous steel box girder; using the traction method to drag the original bridge laterally from its original position to the beam storage area; simultaneously using the jacking method to jack the continuous steel box girder laterally from the assembly cradle to the designed position; after fine-tuning the position of the continuous steel box girder, transferring it from the jacking-up slideway to the permanent support; dismantling the jacking-up slideway and the hauling and jacking-up equipment used for transverse beam replacement; completing the smooth connection between the continuous steel box girder and the existing bridges at both ends; and debugging the line after the transverse jacking-up beam replacement is completed, and opening for operation after debugging is completed.

8. The method for replacing beams by lateral translation and pushing of continuous steel box beams according to claim 6 is characterized in that: Before the continuous steel box girder is pushed, a jacking jack is installed between the reaction back on the pushing slide and the reaction bullneck of the steel distribution beam at the bottom of the beam. The jacking jack is a hydraulic jacking jack with a base flange and connected to the reaction bullneck of the steel distribution beam at the bottom of the continuous steel box girder. The hydraulic jacking jack slides with the continuous steel box girder, and one end of the hydraulic jacking jack piston rod is connected to the automatic reaction shear seat, which provides reaction force by plugging and unplugging the reaction back of the automatic reaction shear seat. During the pushing construction, the pushing is stopped every one meter and the cylinder is accurately retracted to the next section of the reaction slot.

9. A railway bridge, characterized in that: The turnout throat area of ​​the railway bridge adopts the continuous steel box girder structure described in any one of claims 1-5.

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