Transverse splicing structure of plate girder bridge and construction method

Abstract

The invention provides a transverse splicing structure of a plate girder bridge and a construction method, and belongs to the technical field of bridges. According to the splicing structure, the first structural part is connected with the old bridge, the second structural part is connected with the new bridge, meanwhile, the extension part of the second structural part is embedded in the groove in a sliding mode, the elastic part is arranged in the groove, one end of the elastic part is connected with the side wall of the groove, and the other end of the elastic part is connected with the extension part, so that when the new bridge settles, the new bridge is prevented from falling off. The stress released in the sedimentation process is conducted to the elastic piece through the extending part in the second structural piece and then conducted to the first structural piece through the elastic piece. In the process, the elastic piece plays a role in pulling and buffering while ensuring force conduction continuity, and can bear and consume extra internal force caused by deformation difference, so that damage of stress concentration to the structure is relieved, and the technical problem that in the prior art, stress concentration between new and old bridges is concentrated during splicing, and consequently the structure is damaged is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridges, and particularly relates to a transverse splicing structure and construction method for a slab girder bridge. Background Art

[0002] Many newly built highway bridges can only meet the traffic demands in the short term at the initial design stage. However, with the rapid economic development of our country and the continuous growth of traffic demands, traffic congestion often occurs, seriously affecting the road service level and transportation efficiency. Therefore, in addition to building new roads, the country has also vigorously promoted the reconstruction and expansion projects of existing highway bridges to meet the growing transportation demands.

[0003] In the reconstruction and expansion projects of bridges, the connection design between the new and old bridges is crucial for the structural performance and service life. One of the most critical challenges is the transverse connection technology (splicing along the longitudinal joint) between the new and old bridges.

[0004] Due to the shrinkage and creep of materials in newly built concrete hollow slab girder bridges, significant transverse and longitudinal deformations will occur in the later stage of construction, while the material deformations of the old bridges have basically been completed. This deformation difference causes uneven stress on the new and old bridges, which may lead to a significant increase in the horizontal deformation at the beam ends of the splicing part. The later vertical foundation settlement of the new bridge will cause stress concentration at the joint part. If the settlement difference exceeds the critical value, problems such as joint cracking and uneven bridge deck will occur. In addition, the mismatch in stiffness between the new bridge and the old bridge will lead to uneven stress. If the connection stiffness is too large, it may limit the normal deformation of the spliced bridge, resulting in excessive secondary stress inside the structure; if the stiffness at the splicing part is too small, it may not be able to effectively transfer the load, causing local damage at the joint. These problems seriously endanger the safety and durability of the bridge structure, affecting the normal service life of the bridge and traffic operation safety.

[0005] Currently, there are still many deficiencies in the joint design between the new and old bridges in dealing with the deformation difference. The mainstream connection method adopts the design of connecting the upper structure while not connecting the lower structure, which can better balance the deformation difference between the new and old bridges. Among the connection methods for the upper structure, non-connection, hinged connection, semi-rigid connection, and rigid connection can all be selected. The specific form needs to be comprehensively designed according to the actual requirements and stress characteristics of the bridge to improve the overall performance of the bridge and the stability of later operation.

[0006] Therefore, there is an urgent need to develop a new type of transverse splicing structure for concrete hollow slab girder bridges to cope with the huge longitudinal deformation difference between the new and old bridges. The splicing structure needs to have good flexibility and adaptability, and be able to bear and consume the additional internal forces caused by the deformation difference, thereby alleviating the damage of stress concentration to the structure and ensuring the safety and stability of the bridge. By optimizing the design of the splicing structure, the problem of widening connection between the new and old bridges can be effectively solved, achieving seamless connection and long-term operation stability. Summary of the Invention

[0007] An embodiment of the present invention provides a transverse splicing structure and construction method for a slab-girder bridge, aiming to solve the technical problem of stress concentration between new and old bridges during splicing in the prior art, which may cause structural damage.

[0008] To achieve the above object, the technical solution adopted by the present invention is: to provide a transverse splicing structure and construction method for a slab-girder bridge,

[0009] In the first aspect, a transverse splicing structure of a slab-girder bridge includes a first structural member, a second structural member, and an elastic member; the first structural member is a plate-like structure, one end of the first structural member is provided with a groove, and the other end of the first structural member is connected to an old bridge; one end of the second structural member is provided with an extension portion, the other end of the second structural member is connected to a new bridge, and the extension portion is slidably embedded in the groove along the width direction of the first structural member; the elastic member is arranged in the groove, one end of the elastic member is fixedly connected to the side wall of the groove, and the other end of the elastic member is fixedly connected to the extension portion;

[0010] Wherein, when the new bridge releases stress, the stress is conducted from the second structural member to the elastic member through the extension portion, and then conducted to the first structural member through the elastic member. The elastic member plays a role of tying and buffering while ensuring the continuity of force conduction.

[0011] Combined with the first aspect, in a possible implementation manner, hinge supports are provided at the bottoms of both the first structural member and the second structural member, and the tops of the hinge supports are rotatably connected to the bottoms of the first structural member or the second structural member.

[0012] Combined with the first aspect, in a possible implementation manner, a transverse splicing structure of a slab-girder bridge further includes a connection unit, and the connection unit includes a buffer member and two connecting plates. The two connecting plates are respectively fixedly arranged on both sides of the buffer member, and the two connecting plates are respectively fixedly connected to the side walls of the new bridge and the side walls of the old bridge.

[0013] Combined with the first aspect, in a possible implementation manner, the cross-section of the first structural member is a concave structure, and the cross-section of the second structural member is a convex structure.

[0014] Combined with the first aspect, in a possible implementation manner, the cross-section of the buffer member is a honeycomb structure.

[0015] Combined with the first aspect, in a possible implementation manner, a plurality of transverse connecting steel bars are provided on the side wall of the new bridge, and a plurality of transverse steel bars are provided on the side wall of the old bridge; wherein, the connecting plate is fixedly connected to the transverse connecting steel bar or the transverse steel bar.

[0016] In a second aspect, an embodiment of the present invention further provides a construction method for transverse splicing of a slab-beam bridge. The method includes the transverse splicing structure involved in the first aspect, and further includes the following steps: Step S1, obtain the superstructure parameters of the new bridge and the old bridge, the parameter dimensions of the splicing joint, and the axial stiffness parameter of the hinge bearing; according to the obtained superstructure parameters of the new bridge and the old bridge, calculate the layout spacing and position of the splicing structure on the new bridge and the old bridge respectively;

[0017] Step S2, break the road surface of the old bridge to clean out a bearing surface for accommodating the splicing structure and the hinge bearing; implant transverse steel bars in the old bridge; when prefabricating the hollow slab beams of the new bridge, lay transverse connecting steel bars in the new bridge;

[0018] Step S3, respectively arrange the two ends of the splicing structure on the bearing surface of the old bridge and the bridge surface of the new bridge. The hinge bearing and the first structural member are provided on the bearing surface, and there is a first gap between the end of the first structural member and the road surface of the old bridge; the hinge bearing and the second structural member are provided on the bridge surface of the new bridge, and there is a second gap between the end of the second structural member and the road surface of the new bridge; elastic concrete is filled in both the first gap and the second gap; the two ends of the connecting unit are respectively fixedly connected to the transverse steel bars and the transverse connecting steel bars;

[0019] Step S4, asphalt pavement paving.

[0020] Combined with the second aspect, in a possible implementation manner, in the step S1, the superstructure parameters of the new bridge and the old bridge are slab-beam section parameters; the slab-beam section parameters include slab-beam height, slab-beam width, flange width, flange height, web width, and web height; the parameter dimensions of the splicing joint include joint width and joint length.

[0021] Combined with the second aspect, in a possible implementation manner, in the step S2, when implanting the transverse steel bars in the old bridge, the pores between the transverse steel bars and the bridge body of the old bridge are filled with an adhesive.

[0022] Combined with the second aspect, in a possible implementation manner, the adhesive is epoxy resin glue.

[0023] A transverse splicing structure of a slab-beam bridge provided in this embodiment, compared with the prior art, since the first structural member in the splicing structure is connected to the old bridge, the second structural member is connected to the new bridge, and at the same time, the extension part of the second structural member is slidably embedded in the groove, and the elastic member is arranged in the groove and one end of the elastic member is connected to the side wall of the groove and the other end of the elastic member is connected to the extension part. Therefore, when the new bridge settles, the stress released during the settlement process is conducted to the elastic member through the extension part in the second structural member, and then conducted to the first structural member through the elastic member. During this process, the setting of the elastic member can avoid the technical problem that the connection rigidity between the new bridge and the old bridge is too large during conventional rigid connection, which restricts the normal settlement of the new bridge and causes excessive secondary stress in the structure. And the elastic member plays a role of tying and buffering while ensuring the continuity of force conduction, and can bear and consume the additional internal force caused by the deformation difference, thereby alleviating the damage to the structure caused by stress concentration, and solving the technical problem of stress concentration between the new and old bridges during splicing in the prior art, which causes damage to the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. is a schematic structural diagram of a transverse splicing structure of a slab-beam bridge provided in an embodiment of the present invention;

[0025] Figure 2 FIG. is a schematic structural diagram of the first structural member provided in an embodiment of the present invention;

[0026] Figure 3 FIG. is a schematic structural diagram of the second structural member provided in an embodiment of the present invention;

[0027] Figure 4 is Figure 1 a partial enlarged view of area A in

[0028] Figure 5 FIG. is a schematic connection structure diagram of the transverse splicing structure, the connection unit with the new bridge and the old bridge;

[0029] Figure 6 FIG. is a schematic structural diagram of the connection unit;

[0030] DESCRIPTION OF REFERENCE NUMERALS:

[0031] 10, old bridge; 20, new bridge; 11, first structural member; 110, groove; 12, hinge support; 13, elastic concrete; 14, asphalt pavement; 21, second structural member; 210, extension part; 31, elastic member; 101, transverse steel bar; 201, transverse connection steel bar; 104, first gap; 105, second gap; 40, connection unit; 41, connecting plate; 42, honeycomb panel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to 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 used to limit the present invention.

[0033] It should be further noted that the drawings and embodiments of the present invention mainly describe and explain the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems, etc. may not be completely described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above specific forms and settings in a well-known manner.

[0034] When an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] The orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0036] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, and the meaning of "several" is one or more, unless otherwise specifically defined.

[0037] Please refer to Figure 1 and Figure 2 for an illustration of a transverse splicing structure of a plate girder bridge provided by the present invention.

[0038] A transverse splicing structure of a slab-girder bridge includes a first structural member 11, a second structural member 21, and an elastic member 31. The first structural member 11 is in a plate-like structure. One end of the first structural member 11 is provided with a groove 110, and the other end of the first structural member 11 is connected to an old bridge 10. One end of the second structural member 21 is provided with an extension 210, and the other end of the second structural member 21 is connected to a new bridge 20. The extension 210 is slidably embedded in the groove 110 along the width direction of the first structural member 11. The elastic member 31 is arranged in the groove 110. One end of the elastic member 31 is fixedly connected to the side wall of the groove 110, and the other end of the elastic member 31 is fixedly connected to the extension 210.

[0039] Wherein, when the new bridge 20 releases stress, the stress is conducted from the second structural member 21 to the elastic member 31 through the extension 210, and then conducted to the first structural member 11 through the elastic member 31. The elastic member 31 plays a role of tying and buffering while ensuring the continuity of force conduction.

[0040] Compared with the prior art, in the transverse splicing structure of a slab-girder bridge provided in this embodiment, since the first structural member 11 in the splicing structure is connected to the old bridge 10, the second structural member 21 is connected to the new bridge 20, and at the same time, the extension 210 of the second structural member 21 is slidably embedded in the groove 110, and the elastic member 31 is arranged in the groove 110, one end of the elastic member 31 is connected to the side wall of the groove 110, and the other end of the elastic member 31 is connected to the extension 210. Therefore, when the new bridge 20 settles, the stress released during the settlement process is conducted from the extension 210 in the second structural member 21 to the elastic member 31, and then conducted to the first structural member 11 through the elastic member 31. During this process, the setting of the elastic member 31 can avoid the technical problem that the connection rigidity between the new bridge 20 and the old bridge 10 is too large during conventional rigid connection, which restricts the normal settlement of the new bridge 20 and causes excessive secondary stress inside the structure. And the elastic member 31 plays a role of tying and buffering while ensuring the continuity of force conduction, and can bear and consume the additional internal force caused by the deformation difference, thereby alleviating the damage to the structure caused by stress concentration, and solving the technical problem of stress concentration between the new bridge 20 and the old bridge 10 during splicing in the prior art, which causes damage to the structure.

[0041] In some embodiments, referring to Figure 1 , hinge supports 12 are provided at the bottoms of both the first structural member 11 and the second structural member 21. The top of the hinge support 12 is rotatably connected to the bottom of the first structural member 11 or the bottom of the second structural member 21.

[0042] The provision of the articulated bearings 12 can transfer the loads on the road surface to the bridge bodies of the old bridge 10 and the new bridge 20 respectively through the articulated bearings 12. At the same time, the provision of the articulated bearings 12 can enable the first structural member 11 and the second structural member 21 to better adapt to the deformations caused by factors such as loads and temperature changes, and to resist the structural translations caused by wind forces, seismic waves, etc. to a certain extent, so as to ensure the overall safety and overall stability of the bridge.

[0043] Specifically, there are multiple articulated bearings 12, and the articulated bearings 12 are arranged at intervals along the longitudinal direction of the bridge (the bridge length direction). The arrangement of multiple articulated bearings 12 can better ensure that the force conduction during the bridge release process is smoother.

[0044] The articulated bearings 12 can reliably transfer the loads and deformations borne by the upper structure to the lower structure. At the same time, when the new bridge 20 releases stress and deforms, the articulated bearings 12 can drive the transverse splicing structure at the top to deflect adaptively, so as to ensure the continuity and smoothness of the connection between the new bridge 20 and the old bridge 10.

[0045] Please refer to Figure 4 , specifically, the elastic member 31 is a spring. In this application, the elastic member 31 adopts a spring. When the new bridge 20 releases stress, the stress is conducted to the spring through the extension portion 210 in the second structural member 21 and then conducted to the first structural member 11 through the spring. The spring absorbs energy, and the spring connects the first structural member 11 and the second structural member 21 together to ensure the continuity in the force transfer process.

[0046] Please refer to Figure 2 and Figure 3 , on the basis of the above embodiments, specifically, the cross-section of the first structural member 11 is a concave structure, and the cross-section of the second structural member 21 is a convex structure. The first structural member 11 adopts a concave structure and the second structural member 21 adopts a convex structure. The first structural member 11 and the second structural member 21 are slidably embedded into one body, and the articulated bearings 12 are arranged between the first structural member 11 and the old bridge 10. The bottom of the first structural member 11 is rotatably connected to the articulated bearings 12, and the articulated bearings 12 are fixedly connected to the old bridge 10; the articulated bearings 12 are arranged between the first structural member 11 and the old bridge 10. The bottom of the first structural member 11 is rotatably connected to the articulated bearings 12, and the articulated bearings 12 are fixedly connected to the old bridge 10. Therefore, the specific structural settings of the first structural member 11 and the second structural member 21 can prevent the upper planes of the first structural member 11 and the second structural member 21 from being misaligned, and further prevent the occurrence of a height difference between the new bridge 20 and the old bridge 10 when the new bridge 20 settles during the stress release process of the new bridge 20, resulting in an uneven road surface.

[0047] Based on the same inventive concept, the embodiment of the present application also provides a construction method for the transverse splicing of a plate girder bridge, including the following steps:

[0048] Step S1: Obtain the superstructure parameters of the new bridge 20 and the old bridge 10, the parameter dimensions of the splicing joint, and the axial stiffness parameter of the articulated support 12; according to the obtained superstructure parameters of the new bridge 20 and the old bridge 10, calculate the layout spacing and position of the splicing structure on the new bridge 20 and the old bridge 10 respectively.

[0049] Step S2: Crush the road surface of the old bridge 10 and clean out the supporting surface for accommodating the splicing structure and the articulated support 12; implant transverse steel bars 101 in the old bridge 10; when prefabricating the hollow slab beams of the new bridge 20, arrange transverse connecting steel bars 201 in the new bridge 20.

[0050] Step S3: Set the two ends of the splicing structure on the supporting surface of the old bridge 10 and the bridge surface of the new bridge 20 respectively. An articulated support 12 and a first structural member 11 are provided on the supporting surface, and there is a first gap 104 between the end of the first structural member 11 and the road surface of the old bridge 10; an articulated support 12 and a second structural member 21 are provided on the bridge surface of the new bridge 20, and there is a second gap 105 between the end of the second structural member 21 and the road surface of the new bridge 20; elastic concrete 13 is filled in both the first gap 104 and the second gap 105; the two ends of the connecting unit 40 are fixedly connected to the transverse steel bar 101 and the transverse connecting steel bar 201 respectively.

[0051] Step S4: Pave the asphalt pavement 14.

[0052] After connecting the new bridge 20 and the old bridge 10 through the splicing structure and the connecting unit 40, when the new bridge 20 settles, due to the setting of the articulated support 12, the first structural member 11 and the second structural member 21 can rotate around the articulated support 12, so that a smooth transition can be achieved between the new bridge 20 and the old bridge 10. Since the asphalt pavement 14 is laid on the tops of both the first structural member 11 and the second structural member 21, the asphalt pavement 14 has a certain ductility (that is, the ability of the asphalt material to extend without cracking. This property is very important for the asphalt pavement 14 because it directly affects the stability and durability of the road surface. The asphalt pavement 14 with good ductility can generate certain deformations under the action of temperature changes and traffic loads, thus reducing the occurrence of diseases such as cracks and ruts).

[0053] The elastic concrete 13 in Step S3 is a special concrete material with good elasticity and adaptability, and is suitable for various projects requiring high elasticity and crack resistance.

[0054] Specifically, the connecting unit 40 involved in Step S3 includes a honeycomb panel 42 and two connecting plates 41. The two connecting plates 41 are fixedly arranged on both sides of the honeycomb panel 42, and the two connecting plates 41 are fixedly connected to the transverse steel bar 101 and the transverse connecting steel bar 201 respectively.

[0055] Furthermore, in order to ensure the connection strength between the connecting plate 41 and the transverse steel bars 101 and the connection strength between the connecting plate 41 and the transverse connecting steel bars 201, a plurality of through holes are formed in the connecting plate 41, and the positions of the through holes are adapted to the arrangement of the transverse steel bars 101 or the transverse connecting steel bars 201.

[0056] Specifically, the connecting plate 41 and the transverse steel bars 101, and the connecting plate 41 and the transverse connecting steel bars 201 are both connected by welding. More specifically, plug welding technology is adopted.

[0057] The setting of the honeycomb panel 42 can ensure the continuity of the force transmission during the connection between the new bridge 20 and the old bridge 10, and can also ensure the honeycomb panel 42 when the new bridge 20 and the old bridge 10 have large offset displacements.

[0058] In step S2, when the transverse steel bars 101 are implanted into the old bridge 10, the gaps between the transverse steel bars 101 and the bridge body of the old bridge 10 are filled with a binder.

[0059] Specifically, the binder is epoxy resin glue.

[0060] In summary, the advantages and positive effects of this construction method are as follows:

[0061] The lightweight, excellent flexibility and energy absorption capacity of the honeycomb panel 42 adopted in the present invention reduce the additional load on the bridge deck splicing joint part, thereby reducing the additional internal force caused by the uneven settlement difference between the new bridge 20 and the old bridge 10. The excellent flexural stiffness and bearing capacity of the honeycomb panel 42 can improve the overall stiffness and strength of the joint area in the transverse splicing joint, ensuring the reliability of the structure under dynamic load or eccentric load. The size of the honeycomb panel 42 can be customized according to the specific connection size between the new bridge 20 and the old bridge 10, and the installation in the splicing joint is more convenient, and it can be well combined with concrete or other splicing materials, improving the construction efficiency and shortening the construction period.

[0062] The connection unit 40 and the splicing structure are jointly arranged. Not only can the unique honeycomb structure and the structure with fine adjustment of the length of the splicing mechanism disperse the concentrated action of dynamic load and temperature stress, especially at the transverse splicing joint of the bridge, but also can reduce fatigue stress and live load impact stress, thereby prolonging the service life of the joint and the whole bridge.

[0063] The high toughness, excellent crack resistance and deformation adaptability of the elastic concrete 13 can effectively cope with the additional internal force caused by the uneven settlement difference and live load eccentric load at the transverse splicing joint, and at the same time reduce the risk of crack propagation through the efficient energy dissipation performance. The elastic concrete 13 performs excellently in controlling shrinkage and creep, and can relieve the stress concentration problem in the connection area between the new and old bridges 10, providing a strong guarantee for improving the overall durability of the bridge deck and extending the service life.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A transverse splicing structure of a plate girder bridge, characterized in that: The invention comprises a first structural member (11), a second structural member (21) and an elastic member (31); the first structural member (11) is a plate-shaped structure, one end of the first structural member (11) is provided with a groove (110), and the other end of the first structural member (11) is connected to the old bridge (10); one end of the second structural member (21) is provided with an extension portion (210), and the other end of the second structural member (21) is connected to the new bridge (20), and the extension portion (210) is slidably embedded in the groove (110) along the width direction of the first structural member (11); the elastic member (31) is arranged in the groove (110), one end of the elastic member (31) is fixedly connected to the side wall of the groove (110), and the other end of the elastic member (31) is fixedly connected to the extension portion (210); When the new bridge (20) releases stress, the stress is transmitted from the second structural member (21) to the elastic member (31) through the extension portion (210), and then transmitted to the first structural member (11) through the elastic member (31). The elastic member (31) plays a role of tensioning and buffering while ensuring the continuity of force transmission.

2. The transverse splicing structure of a plate girder bridge according to claim 1, characterized in that: The bottom of each of the first structural member (11) and the second structural member (21) is provided with an articulated support (12), and the top of the articulated support (12) is rotatably connected to the bottom of the first structural member (11) or the bottom of the second structural member (21).

3. The transverse splicing structure of the plate girder bridge according to claim 2, characterized in that: The transverse splicing structure of the plate girder bridge also includes a connection unit (40), wherein the connection unit (40) is provided on a buffer and two connection plates (41), wherein the two connection plates (41) are respectively fixedly arranged on both sides of the buffer, and the two connection plates (41) are respectively fixedly connected to the side wall of the new bridge (20) and the side wall of the old bridge (10).

4. The transverse splicing structure of a plate girder bridge according to claim 1, characterized in that: The cross section of the first structural member (11) is a concave structure, and the cross section of the second structural member (21) is a convex structure.

5. The transverse splicing structure of a plate girder bridge according to claim 1, characterized in that: The cross section of the buffer piece is a honeycomb structure.

6. The transverse splicing structure of a plate girder bridge according to claim 2, characterized in that: The side wall of the new bridge (20) is provided with a plurality of transverse connecting steel bars (201), and the side wall of the old bridge (10) is provided with a plurality of transverse connecting steel bars (101); wherein the connecting plate (41) is fixedly connected to the transverse connecting steel bars (201) or the transverse steel bars (101).

7. A construction method for transverse splicing of a slab girder bridge, comprising the transverse splicing structure of a slab girder bridge as claimed in claim 6, characterized in that: The following steps are also included: Step S1, obtaining the upper structure parameters of the new bridge (20) and the old bridge (10), the parameter size of the splicing seam and the axial stiffness parameters of the hinged support (12); and calculating the arrangement spacing and position of the splicing structure on the new bridge (20) and the old bridge (10) respectively according to the obtained upper structure parameters of the new bridge (20) and the old bridge (10); Step S2, crushing the road surface of the old bridge (10) to clear out a bearing surface for accommodating the splicing structure and the hinged support (12); implanting transverse steel bars (101) in the old bridge (10); and laying transverse connecting steel bars (201) in the new bridge (20) when prefabricating the hollow slab beam of the new bridge (20); Step S3, respectively arranging the two ends of the splicing structure on the supporting surface of the old bridge (10) and the bridge deck of the new bridge (20), wherein the hinged support (12) and the first structural member (11) are provided on the supporting surface, and a first gap (104) is provided between the end of the first structural member (11) and the road surface of the old bridge (10); the bridge deck of the new bridge (20) is provided with a hinged support (12) and the second structural member (21), and a second gap (105) is provided between the end of the second structural member (21) and the road surface of the new bridge (20); elastic concrete (13) is filled in the first gap (104) and the second gap (105); the two ends of the connecting unit (40) are respectively fixedly connected to the transverse reinforcement (101) and the transverse connecting reinforcement (201); Step S4: paving the asphalt pavement (14).

8. The construction method for transverse splicing of a slab girder bridge as claimed in claim 7, characterized in that: In step S1, the upper structure parameters of the new bridge (20) and the old bridge (10) are slab beam cross-sectional parameters; the slab beam cross-sectional parameters include slab beam height, slab beam width, flange width, flange height, web width and web height; the joint seam parameter dimensions include joint width and joint length.

9. The construction method for transverse splicing of a slab girder bridge as claimed in claim 7, characterized in that: In the step S2, when the transverse reinforcement (101) is implanted in the old bridge (10), the gap between the transverse reinforcement (101) and the bridge body of the old bridge (10) is filled with adhesive.

10. The construction method for transverse splicing of a slab girder bridge as claimed in claim 9, characterized in that: The adhesive is epoxy resin glue.

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