A bridge integral seamless long joint structure

Abstract

The present application provides an integral seamless long-joint structure of a bridge, which belongs to the field of bridge engineering technology. The integral seamless long-joint structure of the bridge includes a beam body, two side piers and a plurality of supporting structures, wherein the two side piers are respectively supported at the two ends of the beam body, and the plurality of supporting structures are arranged between the two side piers at intervals along the extension direction of the beam body, and the plurality of supporting structures include two first supporting structures, two second supporting structures and a third supporting structure, wherein the two first supporting structures are located between the two side piers and are respectively arranged adjacent to the two side piers, the two second supporting structures are located between the two first supporting structures and are respectively arranged adjacent to the two first supporting structures, and the third supporting structure is located between the two second supporting structures, wherein the stiffness of the pier column of the first supporting structure, the stiffness of the pier column of the second supporting structure and the stiffness of the pier column of the third supporting structure increase in sequence. The integral seamless long-joint structure of the bridge can break through the joint length limitation of the conventional structural system of the bridge.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering, and in particular to an integral seamless long-jointed structure of a bridge. Background Art

[0002] A bridge includes an upper structure and a lower structure. The upper structure of the bridge undergoes expansion and contraction deformation along the extension direction of the beam due to temperature changes and concrete shrinkage creep. At present, conventional bridge structural systems generally adopt a simply supported or simply supported then continuous structure. The conventional bridge structural system is provided with a large number of expansion joints to accommodate this expansion and contraction deformation. To reduce the risk of bridge damage, the expansion and contraction of the bridge must be less than that of the expansion joints. Considering the impact of the expansion and contraction deformation on the bridge, the bridge is divided into sections with expansion joints. To ensure the driving safety of the bridge, the conventional bridge structural system has a limited joint length. Summary of the invention

[0003] The embodiment of the present application provides an integral seamless long-joint structure of a bridge, so as to improve the problem of limited joint length of conventional bridge structural systems and enhance the structural ductility of the bridge.

[0004] The embodiment of the present application provides an integral seamless long-jointed structure of a bridge, including a beam body, two side piers and a plurality of supporting structures. The two side piers are respectively supported at the two ends of the beam body, and the plurality of supporting structures are arranged between the two side piers at intervals along the extension direction of the beam body. The supporting structure includes a pile foundation, a cap foundation, a pier column and a cap beam arranged in sequence from bottom to top, and the cap beam is used to support the beam body. The plurality of supporting structures include two first supporting structures, two second supporting structures and a third supporting structure located between the two supporting structures. The two first supporting structures are located between the two side piers and are respectively arranged adjacent to the two side piers. The two second supporting structures are located between the two first supporting structures and are respectively arranged adjacent to the two first supporting structures. Among them, the stiffness of the pier column of the first supporting structure, the stiffness of the pier column of the second supporting structure and the stiffness of the pier column of the third supporting structure increase in sequence.

[0005] In the above technical solution, the rigidity of the piers of the first supporting structure is less than that of the piers of the second supporting structure, and the rigidity of the piers of the second supporting structure is less than that of the piers of the third supporting structure. The dynamic load caused by the vehicle is mainly borne by the piers of the third supporting structure, and the axial tension and compression caused by the temperature load and concrete creep are mainly borne by the piers of the first supporting structure and the piers of the second supporting structure. This structure can eliminate the internal force of the beam body due to the temperature load and concrete creep, so that the piers of the first supporting structure and the piers of the second supporting structure can replace the expansion joints to reduce the risk of cracking of the beam body. After the expansion joints are eliminated, the bridge is a continuous integral structure, which can break through the conventional bridge structure system joint length, improve the structural ductility, and improve the seismic performance of the bridge.

[0006] In some embodiments, the linear stiffness value of the piers of the third supporting structure is 80% of the linear stiffness value of the beam body, the linear stiffness value of the piers of the second supporting structure is 30% of the linear stiffness value of the beam body, and the linear stiffness value of the piers of the first supporting structure is 10% of the linear stiffness value of the beam body.

[0007] In the above technical solution, the linear stiffness value of the pier of the third supporting structure is 80% of the linear stiffness value of the beam body, the pier of the third supporting structure is a rigid pier, the linear stiffness value of the pier of the second supporting structure is 30% of the linear stiffness value of the beam body, the pier of the second supporting structure is a sub-rigid pier, the linear stiffness value of the pier of the first supporting structure is 10% of the linear stiffness value of the beam body, and the pier of the first supporting structure is a flexible pier. The lower the rigidity of the pier, the higher the flexibility, and the stronger the ability to bear the axial tension and compression caused by temperature load and concrete creep. This structure can eliminate the internal force of the beam body caused by temperature load and concrete creep.

[0008] In some embodiments, the stiffness of the pile foundation of the third support structure is greater than the stiffness of the pile foundation of the second support structure and the stiffness of the pile foundation of the first support structure.

[0009] In the above technical solution, the cap foundation is arranged between the pier and the pile foundation. The cap foundation can transfer the load transmitted by the pier to the pile foundation, and the pile foundation can transfer the load transmitted by the cap foundation to the deep soil layer with strong bearing capacity. The pile foundation can transfer the load of the supporting structure pier, and the dynamic load caused by the vehicle is mainly borne by the pier of the third supporting structure. The axial tension and compression caused by the temperature load and concrete creep are mainly borne by the pier of the first supporting structure and the pier of the second supporting structure. The lower the stiffness of the pile foundation, the higher the flexibility, and the stronger the ability to bear the axial tension and compression caused by the temperature load and concrete creep. Therefore, the stiffness of the pile foundation of the third supporting structure is greater than the stiffness of the second supporting structure and the stiffness of the first supporting structure.

[0010] In some embodiments, the stiffness of the pile foundation of the second support structure is equal to the stiffness of the pile foundation of the first support structure.

[0011] In the above technical solution, the axial tension and compression caused by temperature load and concrete creep are mainly borne by the piers of the first supporting structure and the piers of the second supporting structure. The pile foundation mainly plays the role of transmitting the pier load. The pile foundation stiffness of the first supporting structure and the pile foundation stiffness of the second supporting structure do not need to undergo adaptive changes due to being arranged at different positions of the beam body. Therefore, the stiffness of the first supporting structure is the same as that of the second supporting structure.

[0012] In some embodiments, the pile foundation of the first supporting structure is provided with a first sleeve, the first sleeve is fixedly connected to the cap foundation of the first supporting structure, and a flexible material is filled between the first sleeve and the pile foundation of the first supporting structure. The pile foundation of the second supporting structure is provided with a second sleeve, the second sleeve is fixedly connected to the cap foundation of the second supporting structure, and a flexible material is filled between the second sleeve and the pile foundation of the second supporting structure.

[0013] In the above technical solution, the pile foundation of the first supporting structure is provided with a first sleeve, the first sleeve is fixedly connected to the cap foundation of the first supporting structure, and a flexible material is filled between the first sleeve and the pile foundation of the first supporting structure. The pile foundation of the second supporting structure is provided with a second sleeve, the second sleeve is fixedly connected to the cap foundation of the second supporting structure, and a flexible material is filled between the second sleeve and the pile foundation of the second supporting structure. The pile foundation of the first supporting structure is provided with a first sleeve, and the pile foundation of the second supporting structure is provided with a second sleeve. The first sleeve is fixedly connected to the cap foundation, and the first sleeve can serve as an extension structure of the pier to increase the flexibility of the pier. The second sleeve is fixedly connected to the cap foundation, and the second sleeve can serve as an extension structure of the pier to increase the flexibility of the pier. The flexible material is filled between the first sleeve and the pile foundation to increase the flexibility of the pier. The flexible material is filled between the second sleeve and the pile foundation to increase the flexibility of the pier.

[0014] Since the axial tension and compression caused by temperature load and concrete creep are mainly borne by the piers of the first supporting structure and the piers of the second supporting structure, the higher the flexibility of the piers, the stronger the ability to bear the axial tension and compression caused by temperature load and concrete creep. Therefore, the first sleeve is sleeved on the pile foundation of the first supporting structure, the first sleeve is fixedly connected to the pedestal foundation of the first supporting structure, the second sleeve is sleeved on the pile foundation of the second supporting structure, and the second sleeve is fixedly connected to the pedestal foundation of the second supporting structure, which can better bear the axial tension and compression caused by temperature load and concrete creep.

[0015] In some embodiments, the first sleeve and the second sleeve are circular bellows sleeves.

[0016] In the above technical solution, the sleeve is in a circular corrugated shape, has high strength, simple structure, is easy to produce, is easy to construct, has good economy and long service life.

[0017] In some embodiments, the beam body includes a plurality of beam segments, and a supporting structure is provided between two adjacent beam segments. The bridge seamless long joint structure also includes a consolidation structure, which is located between the two adjacent beam segments and is used to connect the two adjacent beam segments and the cap beam of the supporting structure.

[0018] In the above technical solution, the consolidation structure is connected to the two adjacent beam sections and the cap beam of the supporting structure, so as to realize the integration of the bridge structure and improve the overall structural rigidity of the bridge, thereby greatly improving the driving comfort and the ability to withstand disasters.

[0019] In some embodiments, the consolidation structure includes a first transverse steel bar, a second transverse steel bar, a vertical steel bar and a first concrete layer, the first transverse steel bar is partially buried in one of the two adjacent beam segments, the second transverse steel bar is partially buried in the other beam segment of the two adjacent beam segments, the vertical steel bar is partially buried in the supporting structure, and the first transverse steel bar, the second transverse steel bar and the vertical steel bar are partially buried in the first concrete layer.

[0020] In the above technical solution, a first concrete layer is arranged between two adjacent beam sections, the first transverse steel bars and the second transverse steel bars are partially buried in the first concrete layer, the first transverse steel bars and the second transverse steel bars are partially buried in the two adjacent beam sections respectively, the dynamic load generated by driving on the surface of the beam body is mainly borne by the first concrete layer, the first transverse steel bars transfer the tensile force of the dynamic load to one of the two adjacent beam sections, and the second transverse steel bars transfer the tensile force of the dynamic load to the other of the two adjacent beam sections.

[0021] Part of the vertical steel bars are buried in the first concrete layer, and part of the vertical steel bars are buried in the supporting structure. The dynamic load generated by driving on the surface of the beam is mainly borne by the first concrete layer, and the vertical steel bars transfer the shear force and bending moment of the dynamic load to the supporting structure.

[0022] The force transmission path is simple, clear and reliable, the construction process is simple, the construction precision requirement is low, the construction cost is low, and the economy is good. In some embodiments, a notch is provided at the top of the beam body at a position opposite to the first supporting structure and the second supporting structure, and a second concrete layer is provided in the notch.

[0023] In the above technical scheme, the axial tension and compression caused by temperature and concrete shrinkage creep are mainly borne by the piers of the first supporting structure and the piers of the second supporting structure. The tensile stress on the top surface of the beam body where the first supporting structure and the second supporting structure are arranged is the largest in the horizontal direction. These two positions of the beam body are prone to cracking and damage. Notches are opened at the top of the two positions of the beam body, and a second concrete layer is arranged in the notches. This can greatly improve the crack resistance of the top of the beam body, reduce the risk of cracking and damage of the beam body, and improve driving safety.

[0024] In some embodiments, the notch is provided with a steel mesh, and the steel mesh is buried in the second concrete layer.

[0025] In the above technical solution, a steel mesh is provided in the groove, and the steel mesh is buried in the second concrete layer. The steel mesh can connect the second concrete layer and the beam body, thereby improving the crack resistance of the beam body where the first supporting structure and the second supporting structure are provided, reducing the risk of cracking and damage of the beam body, and improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of an integral seamless long-joint structure of a bridge provided in some embodiments of the present application;

[0028] Figure 2 for Figure 1 The schematic diagram of the connection of the first sleeve shown is sleeved on the pile foundation;

[0029] Figure 3 for Figure 1 The second sleeve is shown as a connection diagram of the sleeve;

[0030] Figure 4 for Figure 1 Schematic diagram of the connection between two adjacent beam segments shown.

[0031] Icons: 100- seamless long-jointed structure of bridge; 10- beam body; 11- beam section; 12- notch; 121- second concrete layer; 20- side pier; 30- supporting structure; 31- pile foundation; 32- pedestal foundation; 33- pier column; 34- cap beam; 30A- first supporting structure; 30B- second supporting structure; 30C- third supporting structure; 40- consolidation structure; 41- first transverse reinforcement; 42- second transverse reinforcement; 43- vertical reinforcement; 44- first concrete layer; 50- first sleeve; 60- second sleeve; 70- flexible material. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] Please refer to Figure 1 , Figure 1A schematic diagram of a seamless long joint structure 100 of a bridge provided in an embodiment of the present application, the seamless long joint structure 100 of the bridge includes a beam body 10, two side piers 20 and a plurality of supporting structures 30. The two side piers 20 are respectively supported at both ends of the beam body 10, and the plurality of supporting structures 30 are arranged between the two side piers 20 at intervals along the extension direction of the beam body 10. The supporting structure 30 includes a pile foundation 31, a cap foundation 32, a pier column 33 and a cap beam 34 arranged in sequence from bottom to top, and the cap beam 34 is used to support the beam body 10. The plurality of supporting structures 30 include two first supporting structures 30A, two second supporting structures 30B and a third supporting structure 30C. The two first supporting structures 30A are located between the two side piers 20 and are respectively arranged adjacent to the two side piers 20. The two second supporting structures 30B are located between the two first supporting structures 30A and are respectively arranged adjacent to the two first supporting structures 30A. The third supporting structure 30C is located between the two supporting structures 30 and is located in the middle of the beam body 10. Among them, the stiffness of the pier 33 of the first supporting structure 30A, the stiffness of the pier 33 of the second supporting structure 30B, and the stiffness of the pier 33 of the third supporting structure 30C increase in sequence.

[0039] The bridge includes an upper structure and a lower structure. The upper structure includes a beam body 10. The lower structure includes a plurality of supporting structures 30 and two side piers 20. The lower structure can support the upper structure and transfer its load to the foundation. The pile foundation 31 can transfer the load of the upper structure to the deep soil layer with strong bearing capacity, or compact the soft soil layer to improve the bearing capacity and density of the foundation soil. The cap foundation 32 can bear and distribute the load transferred by the pier 33. The pier 33 can support the upper structure of the bridge. The cap beam 34 can support the upper structure of the bridge and transfer all the loads to the lower structure of the bridge. The two side piers 20 can also be connected with the embankment to resist the embankment soil pressure and prevent fill landslides and collapses.

[0040] The beam 10 in the bridge superstructure is a prefabricated concrete structure. The external temperature changes, artificial temperature changes and solar radiation cycles act on the beam 10. Due to the poor thermal conductivity of the concrete structure, the surface temperature of the concrete structure rises (or decreases) rapidly, but the internal temperature of the concrete structure is basically in the original state. A large temperature gradient is formed inside the concrete structure, and various parts of the concrete structure are in different temperature states, thereby causing temperature deformation. The deformation of the beam 10 caused by temperature changes is constrained to produce temperature difference stress. In addition, when a vehicle is driven on the surface of the beam 10, the deformation of the concrete structure increases over time under the continuous load. This phenomenon is the creep phenomenon of concrete.

[0041] Under the action of temperature load and concrete creep, the beam body 10 will generate a large internal force. The rigidity of the pier 33 of the first supporting structure 30A is less than that of the pier 33 of the second supporting structure 30B, and the rigidity of the pier 33 of the second supporting structure 30B is less than that of the pier 33 of the third supporting structure 30C. The dynamic load caused by driving is mainly borne by the pier 33 of the third supporting structure 30C, and the axial tension and compression caused by temperature load and concrete creep are mainly borne by the pier 33 of the first supporting structure 30A and the pier 33 of the second supporting structure 30B. The pier 33 of the first supporting structure 30A and the pier 33 of the second supporting structure 30B can replace the expansion joint to reduce the risk of cracking of the beam body 10. After the expansion joint is cancelled, the bridge is a continuous integral structure, which can break through the conventional bridge structure system joint length, improve the structural ductility, and improve the seismic performance of the bridge.

[0042] The pile foundation 31 refers to the lowest part of the bridge that is in direct contact with the foundation.

[0043] The cap foundation 32 refers to a reinforced concrete platform connected to the tops of the piles, which is arranged on the top of the pile foundation 31 to bear and distribute the load transmitted by the pier 33 .

[0044] The pier 33 refers to a load-bearing structure of a bridge substructure used for supporting a bridge superstructure in civil engineering.

[0045] The cap beam 34 refers to a beam disposed on top of the pier 33 to support, distribute and transfer the load of the bridge superstructure.

[0046] The side pier 20 refers to a building located at both ends of the bridge, supporting the superstructure of the bridge and connecting with the embankment.

[0047] The plurality of supporting structures 30 include two first supporting structures 30A, two second supporting structures 30B, and a third supporting structure 30C. It is understandable that among all the supporting structures 30, two supporting structures 30 are first supporting structures 30A, two supporting structures 30 are second supporting structures 30B, and at least one supporting structure 30 is a third supporting structure 30C. All supporting structures 30 located between the two second supporting structures 30B are third supporting structures 30C. There can be one or more third supporting structures 30C, and the number of the third supporting structures 30C can be determined according to the length of the beam body 10.

[0048] It should be noted that the overall seamless long-joint structure of the bridge is a continuous rigid frame bridge, which can be applicable to small and medium span bridges. For example, the overall seamless long-joint structure of the bridge is applicable to small and medium span bridges with a joint length of less than 300 meters.

[0049] The span refers to the horizontal distance between the center lines of two adjacent piers 33 of a small or medium span bridge.

[0050] The joint length refers to the horizontal distance between two adjacent expansion joints on small and medium span bridges.

[0051] The joint length is equal to or greater than two spans.

[0052] Medium span bridges refer to bridges with a span between 25m and 35m.

[0053] Small span bridges refer to bridges with a span of less than 25m.

[0054] During the actual construction process, the eccentricity of the pier 33 of the first supporting structure 30A and the pier 33 of the second supporting structure 30B at the center of the cap beam 34 can be calculated based on the bending moment and vertical load on the top of the pier 33 under the action of the dead load and the live load. During the construction, the cap beam 34 structure is pre-biased by a distance of the eccentricity value to eliminate the eccentric bending moment, which is beneficial to the force of the pier 33 of the first supporting structure 30A and the second supporting structure 30B.

[0055] In some embodiments, please refer to Figure 1 The linear stiffness value of the pier 33 of the third supporting structure 30C is 80% of the linear stiffness value of the beam body 10, the linear stiffness value of the pier 33 of the second supporting structure 30B is 30% of the linear stiffness value of the beam body 10, and the linear stiffness value of the pier 33 of the first supporting structure 30A is 10% of the linear stiffness value of the beam body 10.

[0056] The linear stiffness value of the pier 33 of the third supporting structure 30C is 80% of the linear stiffness value of the beam body 10, the pier 33 of the third supporting structure 30C is a rigid pier 33, the linear stiffness value of the pier 33 of the second supporting structure 30B is 30% of the linear stiffness value of the beam body 10, the pier 33 of the second supporting structure 30B is a sub-rigid pier 33, the linear stiffness value of the pier 33 of the first supporting structure 30A is 10% of the linear stiffness value of the beam body 10, and the pier 33 of the first supporting structure 30A is a flexible pier 33. The lower the stiffness of the pier 33, the higher the flexibility, and the stronger the ability to bear the axial tension and compression caused by the temperature load and concrete creep. This structure can eliminate the internal force generated by the beam body 10 due to the temperature load and concrete creep.

[0057] In the direction extending from the middle position of the beam body 10 to both ends of the beam body 10, under the axial tension and compression caused by temperature load and concrete creep, the bending moment value of the beam body 10 will reach two negative bending moment peaks relative to the middle position of the beam body 10 and then gradually decrease. The negative bending moment at the position of the beam body 10 where the first supporting structure 30A is set reaches the peak value, so the pier 33 of the first supporting structure 30A adopts a flexible pier 33, and the negative bending moment value at the position of the beam body 10 where the second supporting structure 30B is set is lower than the negative bending moment value of the beam body 10 of the first supporting structure 30A, so the pier 33 of the second supporting structure 30B adopts a sub-rigid pier 33.

[0058] Since the compressive stress generated by the prestressed load caused by concrete creep on the middle position of the beam 10 can balance the tensile stress caused by the temperature load on the middle position of the beam 10, the influence of the temperature load and the axial tension and compression caused by concrete creep on the middle position of the beam 10 is not very obvious. Therefore, the pier 33 of the third supporting structure 30C adopts a rigid pier 33.

[0059] A rigid pier 33 is arranged in the middle of the beam body 10, and sub-rigid piers 33 and flexible piers 33 are arranged in sequence along the extending direction of the beam body 10, which can improve the rigidity of the beam body 10 and greatly improve the driving comfort.

[0060] The linear stiffness value refers to the magnitude of the generalized force required to produce unit deformation of the rod.

[0061] Exemplarily, the piers 33 of the third supporting structure 30C are solid piers, and the shape of the piers 33 of the third supporting structure 30C can be square or circular. The piers 33 of the first supporting structure 30A and the piers 33 of the second supporting structure 30B are double-limbed hollow thin-walled piers.

[0062] The pier column 33 of the third supporting structure 30C is a solid pier, which has high rigidity and is more capable of bearing the dynamic load caused by vehicle driving.

[0063] The pier 33 of the first supporting structure 30A and the pier 33 of the second supporting structure 30B are double-limbed hollow thin-walled piers. The double-limbed hollow thin-walled piers have small horizontal thrust stiffness, large longitudinal allowable bridge displacement, good flexibility, and strong ability to withstand axial tension and compression caused by temperature loads and concrete creep.

[0064] Exemplarily, the cross-section of the pier 33 of the first support structure 30A is smaller than the cross-section of the pier 33 of the second support structure 30B.

[0065] In some embodiments, please refer to Figure 1 , the stiffness of the pile foundation 31 of the third supporting structure 30C is greater than the stiffness of the pile foundation 31 of the second supporting structure 30B and the stiffness of the pile foundation 31 of the first supporting structure 30A.

[0066] The cap foundation 32 is arranged between the pier 33 and the pile foundation 31. The cap foundation 32 can transfer the load transmitted by the pier 33 to the pile foundation 31, and the pile foundation 31 can transfer the load transmitted by the cap foundation 32 to the soil layer with strong bearing capacity at a deep depth. The pile foundation 31 can transfer the load of the pier 33 of the supporting structure 30, and the dynamic load caused by the vehicle is mainly borne by the pier 33 of the third supporting structure 30C, and the axial tension and compression caused by the temperature load and concrete creep are mainly borne by the pier 33 of the first supporting structure 30A and the pier 33 of the second supporting structure 30B. The lower the stiffness of the pile foundation 31, the higher the flexibility, and the stronger the ability to bear the axial tension and compression caused by the temperature load and concrete creep. Therefore, the stiffness of the pile foundation 31 of the third supporting structure 30C is greater than the stiffness of the second supporting structure 30B and the stiffness of the first supporting structure 30A.

[0067] The pile foundation 31 may be a single pile, or a single row of piles or multiple rows of piles.

[0068] Exemplarily, the pile foundation 31 of the third supporting structure 30C adopts a group pile foundation 31 , the pile foundation 31 of the first supporting structure 30A adopts a single row pile foundation 31 , and the pile foundation 31 of the second supporting structure 30B adopts a single row pile foundation 31 .

[0069] The pile group foundation 31 refers to a pile foundation 31 composed of multiple rows of piles.

[0070] The single-row pile foundation 31 refers to a row of pile foundations 31 consisting of a plurality of piles.

[0071] Exemplarily, the pile diameter of the pile group foundation 31 is smaller than the pile diameter of the pile of the single-row pile foundation 31, and the total cross-sectional area of ​​the pile group foundation 31 and the single-row pile foundation 31 are equal. Compared with the single-row pile foundation 31, the pile group foundation 31 can bear more horizontal loads (such as wind loads and braking forces, etc.), reducing the load on the piers 33 of the first supporting structure 30A and the piers 33 of the second supporting structure 30B.

[0072] The piles of the exemplary pile foundation 31 are friction piles, which refer to piles in which the axial load is supported by the friction resistance of the pile side and the reaction force of the soil at the pile bottom, and the friction resistance of the pile side plays a major supporting role.

[0073] In some embodiments, please refer to Figure 1 , the stiffness of the pile foundation 31 of the second supporting structure 30B is equal to the stiffness of the pile foundation 31 of the first supporting structure 30A.

[0074] The axial tension and compression caused by temperature load and concrete creep are mainly borne by the piers 33 of the first supporting structure 30A and the piers 33 of the second supporting structure 30B. The pile foundations 31 mainly play the role of transmitting the loads of the piers 33. The stiffness of the pile foundations 31 of the first supporting structure 30A and the stiffness of the pile foundations 31 of the second supporting structure 30B do not need to be adaptively changed because they are arranged at different positions of the beam body 10. Therefore, the stiffness of the first supporting structure 30A is the same as that of the second supporting structure 30B.

[0075] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 3 , Figure 2 Schematic diagram of the connection of the first sleeve 50 sleeved on the pile foundation 31. Figure 3 for Figure 1 The second sleeve 60 is sleeved on the pile foundation 31, and the pile foundation 31 of the first supporting structure 30A is sleeved with the first sleeve 50, and the first sleeve 50 is fixedly connected to the cap foundation 32 of the first supporting structure 30A, and the space between the first sleeve 50 and the pile foundation 31 of the first supporting structure 30A is filled with a flexible material 70. The pile foundation 31 of the second supporting structure 30B is sleeved with the second sleeve 60, and the second sleeve 60 is fixedly connected to the cap foundation 32 of the second supporting structure 30B, and the space between the second sleeve 60 and the pile foundation 31 of the second supporting structure 30B is filled with a flexible material 70.

[0076] The pile foundation 31 of the first supporting structure 30A is sleeved with a first sleeve 50, and the pile foundation 31 of the second supporting structure 30B is sleeved with a second sleeve 60. The first sleeve 50 is fixedly connected to the cap foundation 32, and the first sleeve 50 can serve as an extension structure of the pier 33 to increase the flexibility of the pier 33. The second sleeve 60 is fixedly connected to the cap foundation 32, and the second sleeve 60 can serve as an extension structure of the pier 33 to increase the flexibility of the pier 33. The flexible material 70 is filled between the first sleeve 50 and the pile foundation 31 to increase the flexibility of the pier 33. The flexible material 70 is filled between the second sleeve 60 and the pile foundation 31 to increase the flexibility of the pier 33. Since the axial tension and compression caused by temperature load and concrete creep are mainly borne by the pier 33 of the first supporting structure 30A and the pier 33 of the second supporting structure 30B, the higher the flexibility of the pier 33, the stronger its ability to bear the axial tension and compression caused by temperature load and concrete creep. Therefore, the first sleeve 50 is sleeved on the pile foundation 31 of the first supporting structure 30A, the first sleeve 50 is fixedly connected to the pedestal foundation 32 of the first supporting structure 30A, the second sleeve 60 is sleeved on the pile foundation 31 of the second supporting structure 30B, and the second sleeve 60 is fixedly connected to the pedestal foundation 32 of the second supporting structure 30B, which can better bear the axial tension and compression caused by temperature load and concrete creep.

[0077] In the actual construction process, after the sleeve is installed, the backfill between the sleeve and the pier 33 can be removed, and then the flexible material 70 is filled between the sleeve and the pier 33. Exemplarily, the flexible material 70 is plastic foam.

[0078] For example, the radius of the sleeve may be 1.5 times the pile of the pile foundation 31 of the first supporting structure 30A and the second supporting structure 30B, and the height of the sleeve may be 0.2 times the height of the pier 33 of the first supporting structure 30A and the second supporting structure 30B.

[0079] In some embodiments, the first sleeve 50 and the second sleeve 60 are circular bellows sleeves.

[0080] The sleeve is in a circular corrugated shape, has high strength, simple structure, is easy to produce, is easy to construct, has good economy and long service life.

[0081] In some embodiments, please refer to Figure 1 The beam body 10 includes a plurality of beam sections 11, and a support structure 30 is disposed between two adjacent beam sections 11. The bridge seamless long joint structure 100 also includes a consolidation structure 40, which is located between the two adjacent beam sections 11 and is used to connect the two adjacent beam sections 11 and the cap beam 34 of the support structure 30.

[0082] The consolidation structure 40 is connected to two adjacent beam sections 11 and the cap beam 34 of the supporting structure 30, so as to realize the integration of the bridge structure and improve the overall structural rigidity of the bridge, thereby greatly improving the driving comfort and the disaster-bearing capacity.

[0083] The middle position refers to the middle position in the extending direction of the beam body 10 .

[0084] It should be noted that the consolidation structure 40 is a cast-in-place structure.

[0085] Cast-in-place structure refers to structural components that are reinforced and poured with concrete on site.

[0086] In some embodiments, please refer to Figure 4 , Figure 4 It is a connection diagram of two adjacent beam segments 11, the consolidation structure 40 includes a first transverse steel bar 41, a second transverse steel bar 42, a vertical steel bar 43 and a first concrete layer 44, the first transverse steel bar 41 is partially buried in one beam segment 11 of the two adjacent beam segments 11, the second transverse steel bar 42 is partially buried in the other beam segment 11 of the two adjacent beam segments 11, the vertical steel bar 43 is partially buried in the supporting structure 30, and the first transverse steel bar 41, the second transverse steel bar 42 and the vertical steel bar 43 are partially buried in the first concrete layer 44.

[0087] A first concrete layer 44 is arranged between two adjacent beam sections 11, and the first transverse reinforcement 41 and the second transverse reinforcement 42 are partially buried in the first concrete layer 44. The first transverse reinforcement 41 and the second transverse reinforcement 42 are respectively partially buried in the two adjacent beam sections 11. The dynamic load generated by driving on the surface of the beam body 10 is mainly borne by the first concrete layer 44. The first transverse reinforcement 41 transfers the tensile force of the dynamic load to one beam section 11 of the two adjacent beam sections 11, and the second transverse reinforcement 42 transfers the tensile force of the dynamic load to the other beam section 11 of the two adjacent beam sections 11.

[0088] The vertical steel bars 43 are partially buried in the first concrete layer 44 , and partially buried in the supporting structure 30 . The dynamic load generated by driving on the surface of the beam 10 is mainly borne by the first concrete layer 44 , and the vertical steel bars 43 transfer the shear force and bending moment of the dynamic load to the supporting structure 30 .

[0089] The force transmission path is simple, clear and reliable, the construction process is simple, the construction precision requirement is low, the construction cost is low and the economy is good.

[0090] Exemplarily, the first transverse reinforcement 41 is a tensile reinforcement, the second transverse reinforcement 42 is a tensile reinforcement, and the vertical reinforcement 43 is a bending and shear reinforcement.

[0091] In some embodiments, please refer to Figure 1 A notch 12 is provided at a position on the top of the beam body 10 opposite to the first supporting structure 30A and the second supporting structure 30B, and a second concrete layer 121 is provided in the notch 12 .

[0092] The axial tension and compression caused by temperature and concrete shrinkage creep are mainly borne by the pier 33 of the first supporting structure 30A and the pier 33 of the second supporting structure 30B. The tensile stress on the top surface of the beam body 10 where the first supporting structure 30A and the second supporting structure 30B are arranged is the largest in the horizontal direction. These two positions of the beam body 10 are prone to cracking and damage. A notch 12 is opened at the top of the beam body 10 at these two positions, and a second concrete layer 121 is arranged in the notch 12. This can greatly improve the crack resistance of the top of the beam body 10, reduce the risk of cracking and damage of the beam body 10, and improve driving safety.

[0093] It should be noted that the width of the notch 12 is greater than the width of the consolidation structure 40 , and the first concrete layer 44 of the consolidation structure 40 is located below the notch 12 .

[0094] Exemplarily, the second concrete layer 121 is made of ultra-high performance concrete.

[0095] Ultra-high performance concrete refers to an active powder concrete material that has higher durability and higher mechanical properties than ordinary concrete.

[0096] Exemplarily, the second concrete layer 121 is a cast-in-place structure.

[0097] Exemplarily, the length of the slot 12 is 0.2 times the span and the height is 10 cm.

[0098] It should be noted that in the actual construction process, it is necessary to roughen the surface of the slot 12 first and pour concrete into the slot 12. Roughening is to chisel out multiple dents on the surface where the slot 12 is combined with the second concrete layer 121, thereby increasing the surface roughness of the surface where the slot 12 is combined with the second concrete layer 121, thereby enhancing the bonding effect between the slot 12 and the second concrete layer 121.

[0099] In some embodiments, the notch 12 is provided with a steel mesh, and the steel mesh is buried in the second concrete layer 121 .

[0100] The groove 12 is provided with a steel mesh, which is buried in the second concrete layer 121. The steel mesh can connect the second concrete layer 121 and the beam body 10, thereby improving the crack resistance of the beam body 10 where the first supporting structure 30A and the second supporting structure 30B are set, reducing the risk of cracking and damage of the beam body 10, and improving driving safety.

[0101] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A seamless long-jointed structure of a bridge, characterized in that: include: beam body; Two side piers, supported at two ends of the beam body respectively; A plurality of supporting structures are arranged between the two side piers at intervals along the extension direction of the beam body, wherein the supporting structures include pile foundations, cap foundations, pier columns and cap beams arranged in sequence from bottom to top, and the cap beam is used to support the beam body; The plurality of support structures include: Two first supporting structures are located between the two side piers and are respectively arranged adjacent to the two side piers; two second supporting structures, located between the two first supporting structures and respectively disposed adjacent to the two first supporting structures; and a third support structure located between the two support structures; Wherein, the stiffness of the piers of the first supporting structure, the stiffness of the piers of the second supporting structure and the stiffness of the piers of the third supporting structure increase in sequence; The pile foundation of the first supporting structure is sleeved with a first sleeve, the first sleeve is fixedly connected to the cap foundation of the first supporting structure, and a flexible material is filled between the first sleeve and the pile foundation of the first supporting structure; The pile foundation of the second supporting structure is sleeved with a second sleeve, the second sleeve is fixedly connected to the cap foundation of the second supporting structure, and a flexible material is filled between the second sleeve and the pile foundation of the second supporting structure.

2. The integral seamless long joint structure of the bridge according to claim 1 is characterized in that: The linear stiffness value of the piers of the third supporting structure is 80% of the linear stiffness value of the beam body, the linear stiffness value of the piers of the second supporting structure is 30% of the linear stiffness value of the beam body, and the linear stiffness value of the piers of the first supporting structure is 10% of the linear stiffness value of the beam body.

3. The integral seamless long joint structure of the bridge according to claim 1 is characterized in that: The stiffness of the pile foundation of the third supporting structure is greater than the stiffness of the pile foundation of the second supporting structure and the stiffness of the pile foundation of the first supporting structure.

4. The integral seamless long joint structure of the bridge according to claim 3 is characterized in that: The stiffness of the pile foundation of the second supporting structure is equal to the stiffness of the pile foundation of the first supporting structure.

5. The integral seamless long joint structure of the bridge according to claim 1 is characterized in that: The first sleeve and the second sleeve are circular bellows sleeves.

6. The integral seamless long joint structure of the bridge according to claim 1 is characterized in that: The beam body comprises a plurality of beam sections, and a supporting structure is arranged between two adjacent beam sections; The seamless long-joint structure of the bridge also includes a consolidation structure, which is located between the two adjacent beam sections and is used to connect the two adjacent beam sections and the cap beam of the supporting structure.

7. The integral seamless long joint structure of the bridge according to claim 6 is characterized in that: The consolidation structure includes a first transverse steel bar, a second transverse steel bar, a vertical steel bar and a first concrete layer, wherein the first transverse steel bar is partially buried in one of the two adjacent beam sections, the second transverse steel bar is partially buried in the other of the two adjacent beam sections, the vertical steel bar is partially buried in the supporting structure, and the first transverse steel bar, the second transverse steel bar and the vertical steel bar are partially buried in the first concrete layer.

8. The integral seamless long joint structure of the bridge according to claim 1 is characterized in that: A notch is provided at a position on the top of the beam body opposite to the first supporting structure and the second supporting structure, and a second concrete layer is provided in the notch.

9. The integral seamless long joint structure of the bridge according to claim 8, characterized in that: The notch is provided with a steel mesh, and the steel mesh is buried in the second concrete layer.

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