A splicing structure for widening the flange plate of a long joint bridge main beam

Abstract

The utility model relates to a kind of splicing structure of long-association bridge main girder flange plate widening, including intermediate UHPC cast-in-place section and steel-UHPC combined structure splicing section, steel-UHPC combined structure splicing section is assembled on the main girder flange plate between existing bridge and expansion new bridge adjacent;Steel-UHPC combined structure splicing section includes steel-UHPC combined component, steel-UHPC combined component is installed along the longitudinal direction of bridge, after assembly, there is UHPC layer between steel roof and UHPC bottom plate grouting.The utility model is simple in structure, reasonable in design, convenient in construction, and can be widely applied in the main girder flange plate splicing of existing bridge and expansion new bridge in long-association bridge widening expansion engineering, improve construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a splicing structure for widening the flange plates of the main beam of a long-span bridge. Background Technology

[0002] With the rapid development of my country's national economy and the surge in traffic volume, long-span highway bridges face an urgent need for widening and reconstruction. Widening and reconstruction of long-span highway bridges typically involves widening both sides of the existing bridge. The existing bridge's concrete shrinkage and creep have already completed, while the new bridge's concrete shrinkage and creep are largely incomplete. This difference in concrete shrinkage and creep between the old and new bridges creates a problem. The axial deformation of the new bridge will affect the deformation of the existing bridge, and the transverse deformation of this widened long-span bridge exhibits a stress characteristic of being larger at both ends and smaller in the middle. Furthermore, new bridges in highway bridge reconstruction and expansion typically use pile foundations, making foundation settlement unavoidable. However, the existing bridge's foundation settlement has been completed after several years of operation. Therefore, the difference in vertical deflection of the main beam caused by the foundation settlement of the new bridge will be constrained by the existing bridge, adversely affecting the stress on the spliced ​​structure. In most cases, the main beams of existing bridges and newly expanded bridges are connected as a whole mainly through the wet joints of the flange plates. Therefore, the aforementioned differences in transverse deformation and vertical deflection are mainly coordinated through the deformation of the wet joints of the flange plates.

[0003] In addition, when the local wheel pressure of the vehicle load acts directly on the connecting flange, the bottom of the flange plate wet joint will be under tension. Therefore, the connecting flange plate wet joint between the old and new bridges should have sufficient strength and stiffness to adapt to the deformation caused by the vehicle load. Utility Model Content

[0004] (1) Technical problems to be solved The purpose of this utility model is to provide a splicing structure for widening the flange plates of the main beam of a long-span bridge.

[0005] This invention fully utilizes the ultra-high strength of UHPC by casting UHPC at the wet joint of the main beam flange plate between the existing bridge and the expanded new bridge in the middle UHPC cast-in-place section, so that the existing bridge and the expanded new bridge are permanently connected into a whole. At the same time, it provides splicing protection for the above structure during assembly, thereby achieving the effect of both meeting the stress after splicing and bearing the small transverse deformation caused by the poor shrinkage and creep of concrete after splicing.

[0006] (2) Technical solution To solve the above-mentioned technical problems, this utility model provides: A splicing structure for widening the flange plate of the main beam of a long-span bridge includes an intermediate UHPC cast-in-place section and a steel-UHPC composite structure splicing section, wherein the steel-UHPC composite structure splicing section is assembled on the flange plate of the adjacent main beam between the existing bridge and the expanded new bridge. The steel-UHPC composite structure splicing section includes several steel-UHPC composite components, which are installed along the longitudinal direction of the bridge. Each steel-UHPC composite component includes a steel top plate, a UHPC bottom plate, and finely rolled threaded steel bars for connecting the two. After assembly, a UHPC layer is grouted between the steel top plate and the UHPC bottom plate. UHPC is an ultra-high performance concrete material that is available in the current technology. The middle UHPC cast-in-place section can meet the stress requirements of the existing bridge and the new bridge after expansion. The steel-UHPC composite structure splicing section not only meets the vertical force of the car wheels after the existing bridge and the new bridge are spliced, but also coordinates the deformation difference between the existing bridge and the new bridge. The intermediate UHPC cast-in-place section replaces the traditional ordinary concrete cast-in-place section, permanently connecting the existing bridge and the new bridge expansion into a whole, and bearing the smaller transverse deformation caused by the poor shrinkage and creep of concrete after splicing. The steel-UHPC composite structure splicing section temporarily connects the existing bridge and the new bridge expansion, and bears the large transverse deformation of the bridge caused by the poor shrinkage and creep of concrete after splicing. After the transverse deformation ends after a period of time, UHPC grouting is carried out inside the steel-UHPC composite component splicing section to permanently connect the existing bridge and the new bridge expansion into a whole.

[0007] Furthermore, the steel top plate is installed above the top surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge, and the UHPC bottom plate is installed below the bottom surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge. Specifically, the steel top plate of the steel-UHPC composite component is placed on the top surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge, while the UHPC bottom plate is placed under the bottom surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge.

[0008] Furthermore, the steel top plate is provided with pre-drilled holes; One end of the finely rolled threaded steel bar is pre-embedded inside the UHPC base plate, and the other end passes through the reserved hole and is welded to the steel top plate to form an integral unit.

[0009] Furthermore, grouting ports are provided on the splicing sections of the steel-UHPC composite structure.

[0010] Furthermore, the grouting port is located at the upper or lower end of the steel-UHPC composite structure splicing section, and there is at least one grouting port.

[0011] Furthermore, the UHPC base plate has grouting ports reserved at intervals of 5-8 meters along the longitudinal direction of the bridge. After the transverse deformation of the bridge is completed, UHPC grouting is performed inside the steel-UHPC composite structure at both ends of the span, permanently connecting the existing bridge and the expanded new bridge into a whole. The UHPC base plate serves as a permanent template for the grouting inside the steel-UHPC composite structure. Furthermore, the steel roof plate has grouting ports reserved at intervals along the longitudinal direction of the bridge, with the intervals being 5 to 8 meters.

[0012] Furthermore, at least one protective layer is provided between the steel top plate and the contact surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge. The protective layer is asphalt felt or waterproof membrane. At least one protective layer is provided between the UHPC bottom plate and the contact surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge. The protective layer is asphalt felt or waterproof membrane. A protective layer is placed on the contact surfaces of the steel top plate and the UHPC bottom plate with the flange plate. The protective layer is asphalt felt or waterproof membrane, so that the flange plates of the adjacent main beams between the existing bridge and the expanded new bridge can undergo transverse deformation in the steel-UHPC composite member.

[0013] Furthermore, the steel-UHPC composite structure splicing section is provided with an exhaust port. It should be noted that the diameter of the exhaust port is much smaller than the diameter of the grouting port.

[0014] To facilitate the use of the above structure, a method for splicing the flange plates of the main girder of a long-span bridge is also provided, including the following steps: (1) Based on the calculation and analysis of the finite element model, the influence of the concrete shrinkage and creep difference of the existing bridge and the new bridge on the deformation of the widened long bridge can be obtained. The wet joint of the main beam flange plate is divided into the middle UHPC cast-in-place section and the steel-UHPC composite structure splicing section. (2) Prepare several fine-rolled threaded steel bars, UHPC base plate and steel top plate with reserved holes. Embed one end of the fine-rolled threaded steel bar inside the UHPC base plate and pass the other end through the reserved hole of the steel top plate and weld it to the steel top plate to form a steel-UHPC composite component. Make several steel-UHPC composite components in this way for subsequent operation. (3) During the assembly process, the steel top plate of the steel-UHPC composite component made in step (2) is placed on the top surface of the main beam flange plate adjacent to the existing bridge and the expanded new bridge. At the same time, the UHPC bottom plate is placed under the bottom surface of the main beam flange plate adjacent to the existing bridge and the expanded new bridge. In order to facilitate the transverse deformation of the main beam flange plate adjacent to the existing bridge and the expanded new bridge in the steel-UHPC composite component, a protective layer is placed on the contact surface between the steel top plate and the UHPC bottom plate and the flange plate. The protective layer is asphalt felt or waterproof membrane. (4) Several steel-UHPC composite components are laid along the longitudinal direction of the bridge to form a steel-UHPC composite structure splicing section. During the laying process, the steel top plate can be used as the bottom formwork for the bridge deck pavement, thereby temporarily connecting the existing bridge and the new bridge expansion. (5) The steel-UHPC composite structure splicing section in step (4) temporarily connects the existing bridge and the new bridge expansion, and bears the large transverse deformation of the bridge caused by the poor shrinkage and creep of concrete after splicing. Grouting ports are set in the steel-UHPC composite structure splicing section. Specifically, grouting ports can be reserved at intervals along the longitudinal direction of the UHPC base plate. The interval is generally set to 5 to 8 meters. After the transverse deformation of the bridge is completed for a period of time, UHPC grouting is carried out inside the steel-UHPC composite structure splicing section. During the grouting process, it should be ensured that the UHPC grout is only directed to one side. The grouting ports in the filled areas are sealed in a timely manner. UHPC is used to replace traditional ordinary concrete. UHPC is poured into the wet joints of the main beam flanges of adjacent bridges between the existing bridge and the new bridge expansion. The UHPC base plate serves as a permanent template for the grouting inside the steel-UHPC composite structure. Finally, the UHPC layer connects several steel-UHPC composite components, thereby permanently connecting the existing bridge and the new bridge expansion into a whole. This not only meets the stress requirements after the existing bridge and the new bridge expansion are spliced, but also bears the small transverse deformation caused by the poor shrinkage and creep of concrete after splicing.

[0015] Furthermore, during the laying of several steel-UHPC composite components along the longitudinal direction of the bridge, the steel top plate in the precast steel-UHPC composite component can serve as the bottom formwork for the bridge deck pavement, thereby temporarily connecting the existing bridge and the expanded new bridge. This not only satisfies the vertical force of the vehicle wheels after the existing bridge and the expanded new bridge are spliced ​​together, but also coordinates the large transverse deformation caused by the poor shrinkage and creep of concrete.

[0016] (3) Beneficial effects The beneficial effects of this utility model are as follows: This utility model fully utilizes the ultra-high strength of UHPC. UHPC is poured at the wet joint of the main beam flange plate between the existing bridge and the expanded new bridge at the intermediate UHPC cast-in-place section, and finally a UHPC layer is formed, so that the existing bridge and the expanded new bridge are permanently connected into a whole. This not only meets the stress after splicing, but also bears the small transverse deformation caused by the poor shrinkage and creep of concrete after splicing. The steel-UHPC composite component forms strong vertical bending and compressive stiffness and weak transverse bending stiffness, which not only meets the vertical force of the car wheels after splicing, but also coordinates the large transverse deformation caused by the poor shrinkage and creep of concrete after splicing. The steel top plate and UHPC bottom plate can also serve as permanent templates for bridge deck paving and subsequent UHPC grouting, respectively, thereby saving a lot of support materials and labor.

[0017] Furthermore, this utility model has a simple structure, reasonable design, and convenient construction, which can effectively shorten the splicing time. It can be widely used in the splicing of the main beam flange plates of existing bridges and new bridges in the widening and expansion projects of long-distance bridges, thereby improving construction efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic elevation view of the splicing structure of the flange plate of the main beam of a long-span bridge according to the present invention.

[0019] Figure 2 This is a top plan view of the splicing structure of the flange plate of the main beam of a long-span bridge according to the present invention.

[0020] Figure 3 for Figure 2 Enlarged cross-sectional schematic diagram of the steel-UHPC composite component.

[0021] In the figure: 1-Intermediate UHPC cast-in-place section; 2-Steel-UHPC composite structure splicing section; 20-Steel-UHPC composite component; 30-Adjacent main beam flange plate between the existing bridge and the new bridge expansion; 40-Protective layer; 201-Steel top plate; 202-UHPC bottom plate; 203-Precision rolled threaded steel bar; 204-Grouting port. Detailed Implementation

[0022] The present invention can be better understood from the following embodiments. However, those skilled in the art will readily understand that the specific material ratios, process conditions, and results described in the embodiments are for illustrative purposes only and should not, and will not, limit the present invention as described in detail in the claims.

[0023] Unless otherwise specified, all experimental materials and reagents used are commercially available consumables and reagents. Example 1:

[0024] like Figure 1-3 As shown, the technical solution of this utility model is: a splicing structure for widening the flange plate of the main beam of a long-span bridge, including an intermediate UHPC cast-in-place section 1 and a steel-UHPC composite structure splicing section 2. The intermediate UHPC cast-in-place section 1 can meet the stress requirements of existing bridges and newly expanded bridges after splicing. In addition to meeting the vertical force of the vehicle wheels after the splicing of the existing bridge and the new bridge expansion, the steel-UHPC composite structure splicing segment 2 can also coordinate the deformation difference between the existing bridge and the new bridge expansion. The intermediate UHPC cast-in-place segment 1 replaces the traditional ordinary concrete cast-in-place segment, permanently connecting the existing bridge and the new bridge expansion into a whole, and bearing the small transverse deformation caused by the poor shrinkage and creep of concrete after splicing. The steel-UHPC composite structure splicing segment 2 is assembled on the adjacent main beam flange plate 30 between the existing bridge and the new bridge expansion. The steel-UHPC composite structure splicing segment 2 temporarily connects the existing bridge and the new bridge expansion, bearing the large transverse deformation caused by the poor shrinkage and creep of concrete after splicing. After a period of transverse deformation, UHPC grouting is performed inside the steel-UHPC composite structure splicing segment 2 to permanently connect the existing bridge and the new bridge expansion into a whole. The steel-UHPC composite structure splicing section 2 includes several steel-UHPC composite components 20, which are installed along the longitudinal direction of the bridge. Each steel-UHPC composite component 20 includes a steel top plate 201, a UHPC bottom plate 202, and finely rolled threaded steel bars 203 for connecting the two. After assembly, a UHPC layer is grouted between the steel top plate 201 and the UHPC bottom plate 202.

[0025] Furthermore, the steel top plate 201 is installed above the top surface of the adjacent main beam flange plate 30 between the existing bridge and the expanded new bridge, and the UHPC bottom plate 202 is installed below the bottom surface of the adjacent main beam flange plate 30 between the existing bridge and the expanded new bridge. During assembly, a protective layer 40 is placed on the contact surface between the steel top plate 201 and the UHPC bottom plate 202 and the flange plate 30, wherein the protective layer 40 is asphalt felt or waterproof membrane, so that the adjacent main beam flange plate 30 between the existing bridge and the expanded new bridge can undergo transverse bridge deformation in the steel-UHPC composite component 20.

[0026] Furthermore, in order to achieve effective assembly, a reserved hole is provided on the steel top plate 201, one end of the finely rolled threaded steel bar 203 is embedded in the interior of the UHPC base plate 202, and the other end passes through the reserved hole and is welded to the steel top plate 201 to form an integral part.

[0027] Furthermore, to facilitate grouting, the steel-UHPC composite structure splice section 2 is provided with grouting ports 204. It should be noted that the grouting ports 204 can be located at the top or bottom, and the number of grouting ports 204 in the steel-UHPC composite structure splice section 2 is not limited, but there must be at least one. Therefore, there are multiple combination methods, one of which is as follows: the UHPC base plate 202 has grouting ports 204 reserved at intervals along the longitudinal direction of the bridge, with a distance of 5 to 8 meters. After the transverse deformation of the bridge is completed, UHPC grouting is performed inside the steel-UHPC composite structure splice section 2 to finally form a UHPC layer, so that the existing bridge and the expanded new bridge are permanently connected into a whole. Alternatively, it can be as follows: the steel top plate 201 has grouting ports 204 reserved at intervals in the longitudinal direction of the bridge, the interval being 5 to 8 meters. After the transverse deformation of the bridge is completed, UHPC grouting is performed inside the steel-UHPC composite structure splicing section 2 to finally form a UHPC layer, so that the existing bridge and the expanded new bridge are permanently connected as a whole.

[0028] Furthermore, in order to achieve the effect of venting during the grouting process, the steel-UHPC composite structure splice section 2 is provided with venting ports.

[0029] This invention employs a steel-UHPC composite component to form strong vertical bending and compressive stiffness and relatively weak transverse bending stiffness. This not only meets the vertical force of the vehicle wheels after splicing but also coordinates the large transverse deformation caused by the poor shrinkage and creep of concrete after splicing. The steel top plate and UHPC bottom plate can also serve as permanent templates for bridge deck paving and subsequent UHPC grouting, respectively, thereby saving a significant amount of support materials and labor, making construction more convenient, shortening splicing time, and improving overall construction efficiency.

[0030] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A splicing structure for widening the flange plates of the main girder of a long-span bridge, characterized in that, It includes a middle UHPC cast-in-place section and a steel-UHPC composite structure splicing section, wherein the steel-UHPC composite structure splicing section is assembled on the adjacent main beam flange plate between the existing bridge and the expanded new bridge; The steel-UHPC composite structure splicing section includes several steel-UHPC composite components, which are installed along the longitudinal direction of the bridge. Each steel-UHPC composite component includes a steel top plate, a UHPC bottom plate, and finely rolled threaded steel bars for connecting the two. After assembly, a UHPC layer is grouted between the steel top plate and the UHPC bottom plate.

2. The splicing structure for widening the flange plate of the main beam of a long-span bridge according to claim 1, characterized in that, The steel top plate is installed above the top surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge; The UHPC base plate is installed below the bottom surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge.

3. The splicing structure for widening the flange plate of the main beam of a long-span bridge according to claim 2, characterized in that, The steel top plate has pre-reserved holes; One end of the finely rolled threaded steel bar is pre-embedded inside the UHPC base plate, and the other end passes through the reserved hole and is welded to the steel top plate to form an integral unit.

4. The splicing structure for widening the flange plate of the main beam of a long-span bridge according to claim 3, characterized in that, Grouting ports are provided on the splicing sections of the steel-UHPC composite structure.

5. The splicing structure for widening the flange plate of the main beam of a long-span bridge according to claim 4, characterized in that, The grouting port is located at the upper or lower end of the splicing section of the steel-UHPC composite structure, and there is at least one grouting port.

6. The splicing structure for widening the flange plate of the main beam of a long-span bridge according to claim 5, characterized in that, The UHPC base plate has grouting ports reserved at intervals along the longitudinal direction of the bridge, with intervals of 5 to 8 meters.

7. The splicing structure for widening the flange plate of the main beam of a long-span bridge according to claim 5, characterized in that, The steel roof plate has grouting ports reserved at intervals along the longitudinal direction of the bridge, with intervals of 5 to 8 meters.

8. A splicing structure for widening the flange plate of the main beam of a long-span bridge according to any one of claims 1-7, characterized in that, At least one protective layer is provided between the steel roof plate and the contact surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge. The protective layer is asphalt felt or waterproof membrane. At least one protective layer is provided between the UHPC base plate and the contact surface of the adjacent main beam flange plate between the existing bridge and the expanded new bridge. The protective layer is asphalt felt or waterproof membrane.

9. The splicing structure for widening the flange plate of the main beam of a long-span bridge according to claim 8, characterized in that, The steel-UHPC composite structure splicing section is equipped with an exhaust port.

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