A connection structure of in-service large-span continuous box girder crosswise widening and a construction method thereof

Abstract

The present application relates to a kind of in-service large-span continuous box girder spanning type wide connection structure and its construction method.The structure includes: connecting main piece, including several groove pieces, top plate and several solid blocks;And connecting secondary piece, including several wedge-shaped solid blocks, and box type piece matched with another end of several wedge-shaped solid blocks;When existing old bridge and wide new bridge occur displacement or produce deflection difference, the connecting main piece occurs vertical rotation along the center axis of spherical hinge, wedge-shaped solid block and connecting main piece occur relative displacement, so that connecting main piece and connecting secondary piece occur limited displacement.The construction method includes the following steps: installing new bridge pavement, old bridge pavement;Install support;Assemble connecting main piece, connecting secondary piece and respectively install in wide new bridge and existing old bridge.Compared with prior art, the present application eliminates the problem of traditional expansion joint that may exist at the joint position, improves the comfort of vehicle driving.

Description

Technical Field

[0001] This invention belongs to the field of widening and connection technology for the reconstruction and expansion of long-span bridges, and in particular relates to a cross-type widening and connection structure for in-service long-span continuous box girders and its construction method. Background Technology

[0002] In recent years, the reconstruction and expansion of existing long-span box girder bridges often adopts the method of building new bridges of the same type and then widening and connecting them. However, due to the difference in flexural deformation between the old and new long-span box girders, the flange plates of the widened box girder bridge are often subjected to positive bending moments, which leads to cracking of the root concrete. Furthermore, misalignment is prone to occur at the splicing position, which seriously affects the safety and comfort of vehicles traveling across the joint.

[0003] Chinese patent application CN 216640308 U discloses a connecting device for widening bridges, including an anchoring structure and a segmented simply supported steel plate beam span structure. The segmented simply supported steel plate beam span structure is composed of multiple simply supported steel plate beam span structure units spliced ​​together. This utility model adopts a longitudinally modular segmented simply supported steel plate beam span structure and a support mechanism suitable for multi-directional displacement, which can adapt to the difference in vertical flexural deformation and longitudinal and transverse deformation, as well as torsional deformation of curved beams and single-support beams caused by the difference in stiffness between new and old bridges.

[0004] Chinese patent application CN 115262367 A discloses a connection structure and construction process for a bridge widening section, including several connection units and a covering unit. The connection unit includes: a pressure-bearing connector, which is connected to the new bridge and the old bridge respectively; and a support connecting rod, which is flexibly connected to the pressure-bearing connector at both ends. The support connecting rod can rotate and slide relative to the pressure-bearing connector along its connection point. This invention patent has the effect of improving the continuity of the bridge widening section.

[0005] The aforementioned patents all rely on smooth connections at the splicing points to develop different types of widening connection devices and construction techniques. However, for in-service large-span box girder structures after widening, the root of the flange plate is prone to cracking due to positive bending moment. The above methods are not applicable and do not fundamentally eliminate the potential risks of defects during operation. Summary of the Invention

[0006] The purpose of this invention is to overcome the deformation difference at the splicing connection position of large-span box girder bridges in the prior art, and to provide an in-service large-span continuous box girder spanning splicing connection structure and its construction method.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] This invention utilizes a connection method that allows for limited rotation and extensibility deformation to adapt to the differential deformation of the flange ends of new and old bridges at the connection points of long-span continuous box girder bridges. This improves the ride comfort of vehicles crossing the new and old bridges and fundamentally eliminates the potential problem of tensile fracture after splicing.

[0009] The first aspect of this invention provides a spanning and widening connection structure for in-service long-span continuous box girder bridges, used to connect existing old bridges with widened new bridges. The structure includes:

[0010] The main connecting component of the new bridge spanning the gap includes several channel-shaped components, a top plate covering the channel-shaped components, and several solid blocks mounted within the channel-shaped components via ball joints on its sides; and

[0011] The connecting assemblies for connecting existing old bridges include several wedge-shaped solid blocks extending into the channel-shaped members and having ball joints on their sides, and box-shaped members that match the other ends of the wedge-shaped solid blocks.

[0012] When the existing old bridge and the widened new bridge are displaced or have a deflection difference, the main connecting component rotates vertically along the central axis of the ball joint, and the wedge-shaped solid block and the main connecting component are displaced relative to each other, so that the main connecting component and the connecting sub-component undergo limited displacement.

[0013] Furthermore, it also includes several support components, including:

[0014] The first elastic support is installed on the box girder structure of the widened new bridge;

[0015] A first anchoring part that penetrates the upper and lower surfaces of the solid block and the top plate and is connected to the first support part;

[0016] A flexible second support is installed on the box girder structure of an existing old bridge; and

[0017] A second anchoring part that penetrates the upper and lower surfaces of the wedge-shaped solid block and the box-shaped part and is connected to the second support part.

[0018] Furthermore, the grooved component includes:

[0019] Base plate; and

[0020] Two webs perpendicular to the base plate, the solid block is connected to the webs by a ball joint;

[0021] The top plate has several rectangular holes, the projection of which coincides with the distance between two adjacent web plates.

[0022] Furthermore, the base plate is shaped like a quadratic parabola along its base edge parallel to the web. When the origin of the parabola is used as the starting point of the parabola to establish the coordinate axes, the following formula can be used for calculation:

[0023] y = ax 2+bx;

[0024] Where a and b should satisfy the following requirement:

[0025] -b = a(L1 + D + L2 + 2l);

[0026]

[0027] Wherein, l is the distance from the center of the second anchoring part to the starting point of the parabola, h is the distance from the widened new bridge box girder structure to the bottom plate, L1 is the distance from the center line of the second support part to the end of the flange plate of the widened new bridge box girder structure, and L2 is the length of the connecting main component overlapping the connecting sub-component above the existing old bridge box girder structure.

[0028] Furthermore, the top plate, solid block, and bottom plate are respectively provided with a first anchoring hole, a second anchoring hole, and a third anchoring hole that match the first anchoring part; the projection center of the first anchoring hole passes through the center of the second anchoring hole and the center of the third anchoring hole and coincides with the center line of the bottom plate.

[0029] Furthermore, the box-shaped component includes:

[0030] Several through slots accommodating partially rectangular cross-sectional sections of wedge-shaped solid blocks; and

[0031] A box-shaped plate covering the through slot;

[0032] The box-shaped plate, the wedge-shaped solid block, and the bottom plate of the through groove are respectively provided with a fourth anchoring hole, a fifth anchoring hole, and a sixth anchoring hole that match the second anchoring part; the projection center of the fourth anchoring hole passes through the center of the fifth anchoring hole and the center of the sixth anchoring hole and coincides with the center line of the bottom plate of the through groove.

[0033] Furthermore, the ball joint of the wedge-shaped solid block is connected to the two webs of the through groove.

[0034] Furthermore, the main connecting component also includes a first anti-slip layer laid on the top plate;

[0035] The connecting component also includes a second anti-slip layer laid on the surface of the box-shaped component; the main connecting component is flush with the connecting component.

[0036] Furthermore, the new bridge deck has old bridge paving that is flush with the surface of the main connecting components, and the existing old bridge deck has new bridge paving that is flush with the surface of the connecting sub-components.

[0037] A second aspect of the present invention provides a construction method for a spanning and widening connection structure of an in-service long-span continuous box girder, comprising the following steps:

[0038] S1: Install new bridge paving on the widened bridge deck and install old bridge paving on the existing old bridge deck;

[0039] S2: After detecting the position of transverse prestressed steel bars on the box girder structure of the widened new bridge and the existing old bridge, install support components on the widened new bridge and the existing old bridge.

[0040] S3: Arrange and assemble the main connecting parts and the secondary connecting parts using wedge-shaped solid blocks, and install them on the widened new bridge and the existing old bridge respectively through the first anchoring part and the second anchoring part;

[0041] S4: Lay the first anti-slip layer and the second anti-slip layer on the main connecting component and the secondary connecting component respectively, and keep the surfaces of the new bridge paving, the old bridge paving, the first anti-slip layer and the second anti-slip layer flush, and the project is complete.

[0042] The working principle of this invention is as follows:

[0043] The main connecting component and the secondary connecting component are connected by a wedge-shaped solid block in the secondary connecting component. The wedge-shaped portion of the solid wedge-shaped block is inserted into the groove of the main connecting component, while the rectangular end of the wedge-shaped block is inserted into the through groove of the box-shaped component of the secondary connecting component. Both sides of the wedge-shaped block have ball joints that connect to the web of the through groove. When the newly widened bridge or the existing old bridge experiences horizontal displacement, the wedge-shaped solid block inserted into the groove of the main connecting component undergoes relative displacement with the main connecting component, achieving limited displacement between the main connecting component and the secondary connecting component.

[0044] The solid block of the main component is connected to the web of the channel component by a ball joint on its side. In fact, since the first anchoring part passes through the channel component, the solid block, and the top plate, the solid block is fixed, while the channel component and the top plate can be moved up and down by the ball joints on both sides of the solid block.

[0045] The wedge-shaped solid block of the connecting sub-part is provided with a ball joint on the side to connect with the web plate of the through groove. In fact, since the second anchoring part passes through the box-shaped part and the wedge-shaped solid block, the box-shaped part can be moved up and down due to the ball joints on both sides of the wedge-shaped solid block.

[0046] It should be noted that the first and second anti-slip layers can be made of high-performance resin concrete, which has good flexibility and water resistance, strong adhesion to the steel plate, and prevents rust through the paint film formed on the surface of the steel plate.

[0047] It should be noted that when the first anchorage and the second anchorage conflict with the transverse prestressing tendons in the box girder structure of the widened new bridge or the box girder structure of the existing old bridge, the positions of the tendons passing through the main connecting member and the secondary connecting member, as well as the size and quantity of the first anchorage and the second anchorage, can be appropriately adjusted.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] (1) The present invention solves the problem that the root of the flange plate may be cracked due to tension after splicing of long-span bridges by setting wedge-shaped solid blocks, eliminates the misalignment problem that may exist at the splicing joint position of traditional expansion joints, and improves the comfort of vehicles crossing.

[0050] (2) The complete set of equipment involved in the construction method of the present invention has a low cost and can be constructed in a modular manner, which improves the construction efficiency and enhances the use effect of the box girder splicing connection. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the segment of the span-type widening connection structure of the in-service large-span continuous box girder in Example 1.

[0052] Figure 2 This is a partial cross-sectional schematic diagram of the spanning and widening connection structure of the in-service large-span continuous box girder in Example 1.

[0053] Figure 3 This is a schematic diagram of the straddle-type widening connection structure of the in-service large-span continuous box girder in Example 1.

[0054] Figure 4 This is a schematic diagram of the main connecting components of the in-service large-span continuous box girder spanning and widening connection structure in Example 1.

[0055] Figure 5 This is a cross-sectional schematic diagram of the main connecting component of the spanning and widening connection structure of the in-service large-span continuous box girder in Example 1.

[0056] Figure 6 This is a schematic diagram of the connecting components of the in-service large-span continuous box girder spanning and widening connection structure in Example 1.

[0057] Figure 7 This is a schematic diagram of the support components for the straddle-type widening connection structure of the in-service large-span continuous box girder in Example 1.

[0058] Numbering on the map:

[0059] 1- Wider New Bridge 1, 101- New Bridge Pavement, 102- Box Girder Structure of the Wider New Bridge, 2- Existing Old Bridge, 201- Old Bridge Pavement, 202- Box Girder Structure of the Existing Old Bridge, 3- Connecting Main Component, 301- Channel-shaped Component, 302- Top Plate, 303- Solid Block, 304- Bottom Plate, 305- Web Plate, 306- First Anchor Hole, 307- Second Anchor Hole, 308- Third Anchor Hole 309-First anti-slip layer, 4-Connecting component, 401-Wedge-shaped solid block, 402-Box-shaped component, 403-Through groove, 404-Box-shaped plate, 405-Fourth anchoring hole, 406-Fifth anchoring hole, 407-Sixth anchoring hole, 408-Second anti-slip layer, 5-Support component, 501-First support part, 502-First anchoring part, 503-Second support part, 504-Second anchoring part. Detailed Implementation

[0060] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0061] Unless otherwise specified in this technical solution, the component model, material name, connection structure, control method, and other features are considered to be common technical features disclosed in the prior art.

[0062] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0063] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a bolted connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] To eliminate the misalignment problem that may exist at the splice joints of traditional expansion joints and improve the comfort of vehicles crossing them, this invention provides a cross-span continuous box girder widening connection structure for connecting existing old bridges with widened new bridges 1. The structure is described in [link to structural description]. Figures 1 to 7 As shown, the structure includes:

[0065] The main connecting component 3 of the new bridge spanning the gap includes several channel-shaped components 301, a top plate 302 covering the channel-shaped components 301, and several solid blocks 303 mounted within the channel-shaped components 301 via ball joints on its side; and

[0066] The connecting component 4 for connecting the existing old bridge includes a plurality of wedge-shaped solid blocks 401 extending into the groove-shaped component 301 and having ball joints on their sides, and a box-shaped component 402 that matches the other end of the plurality of wedge-shaped solid blocks 401.

[0067] When the existing old bridge and the widened new bridge are displaced or have a deflection difference, the main connecting component 3 rotates vertically along the central axis of the ball joint, and the wedge-shaped solid block 401 and the main connecting component 3 are displaced relative to each other, so that the main connecting component 3 and the connecting sub-component 4 are displaced to a limited extent.

[0068] For some specific implementation methods, please refer to [link / reference]. Figure 1 and Figure 7 As shown, it also includes several support members 5, which include:

[0069] The first elastic support 501 is installed on the box girder structure of the widened new bridge;

[0070] A first anchoring part 502 that penetrates the upper and lower surfaces of the solid block 303 and the top plate 302 and is connected to the first support part 501;

[0071] A flexible second support 503 is installed on the box girder structure of an existing old bridge; and

[0072] A second anchoring part 504 that penetrates the upper and lower surfaces of the wedge-shaped solid block 401 and the box-shaped part 402 and is connected to the second support part 503.

[0073] For more detailed implementation methods, please refer to [link / reference]. Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the grooved component 301 includes:

[0074] Base plate 304; and

[0075] Two web plates 305 perpendicular to the base plate 304, and the ball joint of the solid block 303 is connected to the web plates 305;

[0076] The top plate 302 has several rectangular holes, the projection of which coincides with the distance between two adjacent web plates 305.

[0077] For more detailed implementation methods, please refer to [link / reference]. Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the base plate 304 is in the shape of a quadratic parabola along its bottom edge parallel to the web plate 305. When the origin is the starting point of the parabola, and a coordinate axis is established, the following formula can be used to calculate:

[0078] y = ax 2 +bx;

[0079] Where a and b should satisfy the following requirement:

[0080] -b = aL1 + D + L2 + 2l;

[0081]

[0082] Wherein, l is the distance from the center of the second anchoring part 504 to the starting point of the parabola, h is the distance from the box girder structure 102 of the widened new bridge to the bottom plate 304, L1 is the distance from the center line of the second support part 503 to the end of the flange plate of the box girder structure 202 of the widened new bridge, and L2 is the length of the connection main part 3 overlapping with the connection sub-part 4 above the box girder structure 202 of the existing old bridge.

[0083] For more detailed implementation methods, please refer to [link / reference]. Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the top plate 302, solid block 303, and bottom plate 304 are respectively provided with a first anchoring hole 306, a second anchoring hole 307, and a third anchoring hole 308 that match the first anchoring part 502; the projection center of the first anchoring hole 306 passes through the center of the second anchoring hole 307 and the center of the third anchoring hole 308 and coincides with the center line of the bottom plate 304.

[0084] For more detailed implementation methods, please refer to [link / reference]. Figure 1 and Figure 6 As shown, the box-shaped component 402 includes:

[0085] Several through slots 403 for accommodating partially rectangular cross-sectional sections of wedge-shaped solid blocks 401; and

[0086] Box-shaped plate 404 covering the through groove 403;

[0087] The box-shaped plate 404, the wedge-shaped solid block 401, and the bottom plate of the through groove 403 are respectively provided with a fourth anchoring hole 405, a fifth anchoring hole 406, and a sixth anchoring hole 407 that match the second anchoring part 504; the projection center of the fourth anchoring hole 405 passes through the center of the fifth anchoring hole 406 and the center of the sixth anchoring hole 407 and coincides with the center line of the bottom plate of the through groove 403.

[0088] For more detailed implementation methods, please refer to [link / reference]. Figure 1 and Figure 6As shown, the ball joint of the wedge-shaped solid block 401 is connected to the two webs of the through groove 403.

[0089] For some specific implementation methods, please refer to [link / reference]. Figure 3 and Figure 6 As shown, the connecting main component 3 also includes a first anti-slip layer 309 laid on the top plate 302;

[0090] The connecting component 4 also includes a second anti-slip layer 408 laid on the surface of the box-shaped component 402; the main connecting component 3 is flush with the connecting component 4.

[0091] For some specific implementation methods, please refer to [link / reference]. Figure 1 , Figure 3 and Figure 6 As shown, the new bridge 1 with its widened surface has an old bridge pavement 201 that is flush with the surface of the connecting main component 3, and the existing old bridge surface has a new bridge pavement 101 that is flush with the surface of the connecting sub-component 4.

[0092] This invention also provides a construction method for an in-service long-span continuous box girder spanning and widening connection structure, comprising the following steps:

[0093] S1: Install new bridge pavement 101 on the bridge deck of the widened new bridge 1, and install old bridge pavement 201 on the existing old bridge deck;

[0094] S2: After detecting the position of transverse prestressed steel bars on the box girder structure 102 of the widened new bridge and the box girder structure 202 of the existing old bridge, install support components 5 on the widened new bridge 1 and the existing old bridge.

[0095] S3: Arrange and assemble the main connecting component 3 and the secondary connecting component 4 using wedge-shaped solid blocks 401, and install them on the widened new bridge 1 and the existing old bridge respectively through the first anchoring part 502 and the second anchoring part 504.

[0096] S4: Lay the first anti-slip layer 309 and the second anti-slip layer 408 on the main connecting component 3 and the secondary connecting component 4 respectively, and keep the surfaces of the new bridge pavement 101, the old bridge pavement 201, the first anti-slip layer 309 and the second anti-slip layer 408 flush, and the process is complete.

[0097] Each of the above implementation methods can be implemented individually, or in any combination of two or more.

[0098] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0099] Example 1

[0100] To eliminate the misalignment problem that may exist at the splice joints of traditional expansion joints and improve the comfort of vehicles crossing them, this invention provides a cross-span continuous box girder widening connection structure for connecting existing old bridges with widened new bridges 1. The structure is described in [link to structural description]. Figures 1 to 7 As shown, the structure includes:

[0101] The main connecting component 3 of the new bridge spanning the gap includes several channel-shaped components 301, a top plate 302 covering the channel-shaped components 301, and several solid blocks 303 mounted within the channel-shaped components 301 via ball joints on its side; and

[0102] The connecting component 4 for connecting the existing old bridge includes a plurality of wedge-shaped solid blocks 401 extending into the groove-shaped component 301 and having ball joints on their sides, and a box-shaped component 402 that matches the other end of the plurality of wedge-shaped solid blocks 401.

[0103] When the existing old bridge and the widened new bridge are displaced or have a deflection difference, the main connecting component 3 rotates vertically along the central axis of the ball joint, and the wedge-shaped solid block 401 and the main connecting component 3 are displaced relative to each other, so that the main connecting component 3 and the connecting sub-component 4 are displaced to a limited extent.

[0104] It should be noted that there are 8 slotted parts here.

[0105] Please see again. Figure 1 and Figure 7 As shown, it also includes several support members 5, which include:

[0106] The first elastic support 501 is installed on the box girder structure of the widened new bridge;

[0107] A first anchoring part 502 that penetrates the upper and lower surfaces of the solid block 303 and the top plate 302 and is connected to the first support part 501;

[0108] A flexible second support 503 is installed on the box girder structure of an existing old bridge; and

[0109] A second anchoring part 504 that penetrates the upper and lower surfaces of the wedge-shaped solid block 401 and the box-shaped part 402 and is connected to the second support part 503.

[0110] It should be noted that the length of the first anchorage part 502 and the second anchorage part 504 is half the thickness of the flange plate of the box girder structure 102 of the widened new bridge and the box girder structure 202 of the existing old bridge.

[0111] Please see again. Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the grooved part 301 includes:

[0112] Base plate 304; and

[0113] Two web plates 305 perpendicular to the base plate 304, and a ball joint connecting the solid block 303 to the web plates 305;

[0114] The top plate 302 has several rectangular holes, the projection of which coincides with the distance between two adjacent web plates 305.

[0115] Please see again. Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the base plate 304 forms a quadratic parabola along its base edge parallel to the web plate 305. When the origin is the starting point of the parabola, the coordinate axes are established, and the following formula can be used to calculate:

[0116] y = ax 2 +bx;

[0117] Where a and b should satisfy the following requirement:

[0118] -b = aL1 + D + L2 + 2l;

[0119]

[0120] Wherein, l is the distance from the center of the second anchoring part 504 to the starting point of the parabola, h is the distance from the box girder structure 102 of the widened new bridge to the bottom plate 304, L1 is the distance from the center line of the second support part 503 to the end of the flange plate of the box girder structure 102 of the widened new bridge, and L2 is the length of the connection main part 3 overlapping with the connection sub-part 4 above the box girder structure 202 of the existing old bridge.

[0121] Please see again. Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the top plate 302, the solid block 303, and the bottom plate 304 are respectively provided with a first anchoring hole 306, a second anchoring hole 307, and a third anchoring hole 308 that match the first anchoring part 502; the projection center of the first anchoring hole 306 passes through the center of the second anchoring hole 307 and the center of the third anchoring hole 308 and coincides with the center line of the bottom plate 304.

[0122] Please see again. Figure 1 and Figure 6 As shown, the box-type component 402 includes:

[0123] Several through slots 403 for accommodating partially rectangular cross-sectional sections of wedge-shaped solid blocks 401; and

[0124] Box-shaped plate 404 covering the through groove 403;

[0125] The box-shaped plate 404, the wedge-shaped solid block 401, and the bottom plate of the through groove 403 are respectively provided with a fourth anchoring hole 405, a fifth anchoring hole 406, and a sixth anchoring hole 407 that match the second anchoring part 504; the projection center of the fourth anchoring hole 405 passes through the center of the fifth anchoring hole 406 and the center of the sixth anchoring hole 407 and coincides with the center line of the bottom plate of the through groove 403.

[0126] Please see again. Figure 1 and Figure 6 As shown, the ball joint of the wedge-shaped solid block 401 is connected to the two webs of the through groove 403.

[0127] Please see again. Figure 3 and Figure 6 As shown, the connecting main component 3 also includes a first anti-slip layer 309 laid on the top plate 302;

[0128] The connecting sub-component 4 also includes a second anti-slip layer 408 laid on the surface of the box-shaped component 402; the main connecting component 3 is flush with the connecting sub-component 4.

[0129] Please see again. Figure 1 , Figure 3 and Figure 6 As shown, the new bridge 1 has an old bridge pavement 201 that is flush with the surface of the connecting main component 3 on its bridge surface, and the existing old bridge has a new bridge pavement 101 that is flush with the surface of the connecting sub-component 4 on its bridge surface.

[0130] The working principle of this embodiment is as follows:

[0131] The main connecting component 3 and the secondary connecting component 4 are connected by a wedge-shaped solid block 401 in the secondary connecting component 4. The wedge-shaped portion of the wedge-shaped solid block 401 is inserted into the groove 301 of the main connecting component 3, while the rectangular end of the other end of the wedge-shaped solid block 401 is inserted into the through groove 403 of the box-shaped component 402 of the secondary connecting component 4. Both sides of the wedge-shaped solid block 401 have ball joints that connect to the web of the through groove 403. When the newly widened bridge 11 and the existing old bridge 2 undergo horizontal displacement, the wedge-shaped solid block 401 inserted into the groove 301 of the main connecting component 3 undergoes relative displacement with the main connecting component 1, achieving limited displacement between the main connecting component 3 and the secondary connecting component 4.

[0132] The solid block 303 of the main component 3 is provided with a ball joint on its side to connect with the web plate 305 of the channel component 301. In fact, since the first anchoring part 502 passes through the channel component 301, the solid block 303, and the top plate 302, the solid block 303 is fixed, while the channel component 301 and the top plate 302 can be moved up and down due to the ball joints on both sides of the solid block 303.

[0133] The wedge-shaped solid block 401 of the connecting sub-part 4 is provided with a ball joint on its side and connected to the web of the through groove 403. In fact, since the second anchoring part 504 passes through the box-shaped part 402 and the wedge-shaped solid block 401, the box-shaped part 402 can be moved up and down due to the ball joints on both sides of the wedge-shaped solid block 401.

[0134] It should be noted that the first anti-slip layer 309 and the second anti-slip layer 408 are made of high-performance resin concrete, which has good flexibility and water resistance, and has extremely strong adhesion to the steel plate. It also plays a role in preventing rust by forming a paint film on the surface of the steel plate.

[0135] Example 2

[0136] This embodiment provides a construction method for a spanning and widening connection structure of an in-service long-span continuous box girder, as described in Embodiment 1, including the following steps:

[0137] S1: Install new bridge pavement 101 on the bridge deck of the widened new bridge 1, and install old bridge pavement 201 on the existing old bridge deck;

[0138] S2: After detecting the position of transverse prestressed steel bars in the box girder structure 102 of the widened new bridge and the box girder structure 202 of the existing old bridge, install support components 5 on the widened new bridge 1 and the existing old bridge, that is, install the first support part 501 on the widened new bridge 1 and the second support part 503 on the existing old bridge.

[0139] S3: Arrange and assemble the main connecting component 3 and the secondary connecting component 4 using wedge-shaped solid blocks 401. One end of the wedge-shaped solid block 401 is inserted into the groove 301 of the main connecting component 3, and the other end is located in the through groove 403 of the secondary connecting component. It is installed on the new bridge 1 and the existing old bridge through the first anchoring part 502 and the second anchoring part 504 respectively. That is, the first anchoring part 502 passes through the top plate 302, the solid block 303, the bottom plate 304 and connects to the first support part 501. The second anchoring part 504 passes through the box plate 404, the wedge-shaped solid block 401, the through groove 403 and connects to the second support part 503.

[0140] S4: Lay the first anti-slip layer 309 and the second anti-slip layer 408 on the main connecting component 3 and the secondary connecting component 4 respectively, and keep the surfaces of the new bridge pavement 101, the old bridge pavement 201, the first anti-slip layer 309 and the second anti-slip layer 408 flush, and the process is complete.

[0141] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A spanning and widening connection structure for in-service long-span continuous box girder bridges, used to connect existing old bridges with widened new bridges, characterized in that, The structure includes: The connecting main component (3) of the new bridge spanning the gap includes several channel-shaped components (301), a top plate (302) covering the several channel-shaped components (301), and several solid blocks (303) installed in the channel-shaped components (301) through ball joints on its side; and The connecting component (4) for connecting the existing old bridge includes a plurality of wedge-shaped solid blocks (401) extending into the groove-shaped component (301) and having ball joints on their sides, and a box-shaped component (402) that matches the other end of the plurality of wedge-shaped solid blocks (401). When the existing old bridge and the widened new bridge are displaced or have a deflection difference, the connecting main component (3) rotates vertically along the central axis of the ball joint, and the wedge solid block (401) and the connecting main component (3) are displaced relative to each other, so that the connecting main component (3) and the connecting sub-component (4) are displaced to a limited extent. It also includes several support components (5), which include: The first elastic support (501) is installed on the box girder structure of the widened new bridge. A first anchoring part (502) that penetrates the upper and lower surfaces of the solid block (303) and the top plate (302) and is connected to the first support part (501); A flexible second support (503) is installed on the box girder structure of the existing bridge; and A second anchoring part (504) that penetrates the upper and lower surfaces of the wedge-shaped solid block (401) and the box-shaped part (402) and is connected to the second support part (503). The grooved component (301) includes: Base plate (304); and Two webs (305) perpendicular to the base plate (304), and the ball joint of the solid block (303) is connected to the webs (305); The top plate (302) has several rectangular holes, the projection of which coincides with the distance between two adjacent web plates (305); The top plate (302), solid block (303), and bottom plate (304) are respectively provided with a first anchoring hole (306), a second anchoring hole (307), and a third anchoring hole (308) that match the first anchoring part (502); the projection center of the first anchoring hole (306) passes through the center of the second anchoring hole (307) and the center of the third anchoring hole (308) and coincides with the center line of the bottom plate (304); The box-shaped component (402) includes: Several through slots (403) for accommodating partially rectangular cross-sectional sections of wedge-shaped solid blocks (401); and A box-shaped plate (404) covering the through groove (403); The box-shaped plate (404), the wedge-shaped solid block (401), and the bottom plate of the through groove (403) are respectively provided with a fourth anchoring hole (405), a fifth anchoring hole (406), and a sixth anchoring hole (407) that match the second anchoring part (504); the projection center of the fourth anchoring hole (405) passes through the center of the fifth anchoring hole (406) and the center of the sixth anchoring hole (407) and coincides with the center line of the bottom plate of the through groove (403).

2. The in-service long-span continuous box girder spanning and widening connection structure according to claim 1, characterized in that, The base plate (304) is in the shape of a quadratic parabola along its bottom edge parallel to the web plate (305). When the origin of the parabola is used as the starting point, a coordinate axis is established, and the following formula is used for calculation: ； Where a and b should satisfy the following requirement: ； ； Wherein, l is the distance from the center of the second anchoring part (504) to the starting point of the parabola, h is the distance from the widened new bridge box girder structure to the bottom plate (304), L1 is the distance from the center line of the second support part (503) to the end of the flange plate of the widened new bridge box girder structure, and L2 is the length of the connection main part (3) overlapping with the connection sub-part (4) above the existing old bridge box girder structure.

3. The in-service long-span continuous box girder spanning and widening connection structure according to claim 1, characterized in that, The ball joint of the wedge-shaped solid block (401) is connected to the two webs of the through groove (403).

4. The in-service long-span continuous box girder spanning and widening connection structure according to claim 1, characterized in that, The connecting main component (3) also includes a first anti-slip layer (309) laid on the top plate (302); The connecting sub-component (4) further includes a second anti-slip layer (408) laid on the surface of the box-shaped component (402); the connecting main component (3) is flush with the connecting sub-component (4).

5. The in-service long-span continuous box girder spanning and widening connection structure according to claim 1, characterized in that, The new bridge deck has old bridge paving that is flush with the surface of the connecting main component (3), and the existing old bridge deck has new bridge paving that is flush with the surface of the connecting sub-component (4).

6. A construction method for a spanning and widening connection structure of an in-service long-span continuous box girder as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Install new bridge paving on the widened bridge deck and install old bridge paving on the existing old bridge deck; S2: After detecting the position of transverse prestressed steel bars on the box girder structure of the widened new bridge and the box girder structure of the existing old bridge, install support components on the widened new bridge and the existing old bridge (5). S3: Arrange and assemble the main connecting component (3) and the secondary connecting component (4) using wedge-shaped solid blocks (401), and install them on the widened new bridge and the existing old bridge respectively through the first anchoring part (502) and the second anchoring part (504); S4: Lay the first anti-slip layer (309) and the second anti-slip layer (408) on the main connecting component (3) and the secondary connecting component (4) respectively, and keep the surfaces of the new bridge paving, the old bridge paving, the first anti-slip layer (309) and the second anti-slip layer (408) flush, and the project is complete.

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