A chute type transverse connection structure suitable for long-association concrete bridge splicing widening engineering

Abstract

The application relates to a slide type transverse connecting structure suitable for long-association concrete bridge splicing and widening engineering, which is used for splicing and widening of old bridges and new bridges, and the slide type transverse connecting structure comprises a core sliding block located at the old bridge side, a longitudinal sliding track located at the new bridge side and slidingly matched with the core sliding block along the bridge longitudinal direction, a plurality of transverse pre-buried steel bars pre-buried into the old bridge and one end of which is fixedly connected with the core sliding block, and a transverse connecting steel bar with one end located in the core sliding block along the bridge transverse direction and the other end penetrating through the core sliding block and the longitudinal sliding track and being in a tension state and fixed with the new bridge. The application can replace the conventional transverse connecting form, so that the spliced box girder has longitudinal sliding, vertical shearing and transverse anti-pulling capacities, and effectively solves a series of problems caused after the concrete continuous girder bridge is spliced and widened by the conventional construction method.

Description

Technical Field

[0001] This invention belongs to the field of bridge splicing and widening technology, and relates to a sliding transverse connection structure suitable for splicing and widening projects of long-span concrete bridges. Background Technology

[0002] With the rapid development of the national economy, the problem of insufficient capacity of existing highways has become increasingly apparent. To alleviate the contradiction between traffic flow and capacity, widening and upgrading existing bridges has become an effective option. However, past practices in widening long-span concrete bridges have shown that existing bridge widening methods have a series of technical bottlenecks: after widening, the spliced ​​structure of long-span concrete continuous beam bridges will experience excessive lateral bending deformation, leading to serious defects such as cracking and damage of the widened structure; moreover, the interface longitudinal shear stiffness of conventional transverse connection structures is very high, and the longitudinal constraints between them are strong, making it difficult to control the eccentric compression deformation of the widened structure. Summary of the Invention

[0003] The purpose of this invention is to provide a sliding transverse connection structure suitable for splicing and widening projects of long-span concrete bridges, which allows the new and old bridges to slide freely in the longitudinal direction, effectively dissipating the longitudinal deformation difference between the new and old bridges, and fundamentally solving the problem of longitudinal deformation between new and old bridges in long-span concrete continuous box girder bridges.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] One of the technical solutions of the present invention provides a sliding-track type transverse connection structure suitable for splicing and widening projects of long-span concrete bridges, used for splicing and widening old bridges and new bridges. This sliding-track type transverse connection structure includes:

[0006] The core slider is located on the side of the old bridge;

[0007] A longitudinal slide rail located on the side of the new bridge and sliding along the bridge direction to fit the core slider;

[0008] Several transverse pre-embedded steel bars are embedded in the old bridge and extend out at one end to be fixedly connected to the core slider;

[0009] One end is positioned within the core slider along the transverse direction of the bridge, and the other end passes through the core slider and the longitudinal slide, and is a transverse connecting steel bar fixed to the new bridge in a tensioned state.

[0010] Furthermore, the core slider includes a square steel pipe with a slot along the bridge direction near the side of the new bridge, and steel plates fixed to the upper and lower surfaces of the square steel pipe to form a T-shaped structure. The end of the transverse pre-embedded steel bar is fixed to the steel plate, and one end of the transverse connecting steel bar is located inside the square steel pipe, and its end size is larger than the slot size.

[0011] Furthermore, the steel plate is machined with holes, and the ends of the transversely embedded reinforcing bars pass through the holes and are welded and fixed to the steel plate.

[0012] Furthermore, the transverse pre-embedded reinforcing bars are provided in two rows and are respectively fixed to the steel plates above and below the square steel pipe.

[0013] Furthermore, a short steel bar is welded to the end of the transverse connecting steel bar that extends into the square steel pipe, so that the corresponding end of the transverse connecting steel bar is not pulled out after extending into the square steel pipe, thus forming a transverse pull-out resistance.

[0014] Furthermore, the concrete portion of the old bridge near the flange of its box girder has several transverse holes drilled longitudinally, and one end of the transverse pre-embedded steel bar is inserted into the transverse hole using epoxy resin adhesive.

[0015] Furthermore, epoxy mortar is poured between the core slider and the old bridge.

[0016] Furthermore, the longitudinal slide rail includes two symmetrical, angled structures that are respectively attached to the upper and lower sides of the core structure. There is a longitudinal gap between the two angled structures for the transverse connecting steel bars to pass through. After the transverse connecting steel bars pass through the longitudinal gap, wooden strips are inserted into the gaps formed by the adjacent transverse connecting steel bars and the angled structures to ensure that there are no gaps.

[0017] Furthermore, each folded structure is composed of three polyoxymethylene (POM) boards spliced ​​together, with adjacent POM boards assembled vertically.

[0018] The second technical solution of the present invention provides a bridge that is widened by splicing old and new bridges, including an old bridge, a new bridge, and a sliding transverse connection structure as described above between the old bridge and the new bridge.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] (1) This invention fundamentally solves the problems of longitudinal deformation differences and vertical shear resistance between the old and new bridges in a long span. The biggest difference from conventional transverse connection structures is that the transverse connection structure in this invention forms a sliding channel through close contact between the angled polyoxymethylene board and the core slider, ensuring that the longitudinal direction can slide and deform relative to each other. A longitudinal sliding effect is generated between the two, thereby absorbing the difference in longitudinal shrinkage and creep deformation between the old and new structures, and solving the problem of excessive transverse deformation caused by mutual constraints between the old and new structures.

[0021] (2) A short steel bar is welded to the end of a layer of steel bars anchored in the flange of the new bridge box girder. The short steel bar extends into the steel bar through the opening of the square steel pipe. The short steel bar controls the steel bar from being pulled out in the lateral direction, thus forming a lateral pull-out resistance. At the same time, the lateral connecting steel bar and the square steel pipe can slide freely in the longitudinal direction, realizing the longitudinal sliding function between the new and old bridge structures, and achieving the effects of lateral pull-out resistance and vertical shear resistance.

[0022] (3) Both the polyoxymethylene board and the steel plate in this invention have good deformation capacity. When the new and old bridge components interact, they can effectively balance the lateral compression between the hole walls, thus solving the problem of excessive lateral tensile stress when traditional hinged wet joints are applied to the widening of long-span concrete box girders.

[0023] (4) In this invention, the square steel pipe and the upper and lower side steel plates are welded together to form a core structure. Epoxy mortar is poured between this structure and the old bridge flange plate. With the combined effect of the transversely embedded steel bars and the poured epoxy mortar, the core structure bears the vertical shear stress. Therefore, this invention has good shear resistance to ensure the overall safety of the structure under the action of the difference in foundation settlement between the new bridge box girder flange and the old bridge box girder flange. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the slide-type transverse connection structure of the present invention;

[0025] Figure 2 This is an exploded structural diagram of the slide-type transverse connection structure of the present invention;

[0026] Figure 3 This is a schematic diagram illustrating a specific application of a slide-type transverse connection structure.

[0027] Figure 4 This is a schematic diagram of the holes drilled in the steel plate along the bridge direction;

[0028] Explanation of markings in the diagram:

[0029] 1- Horizontal connecting steel bar, 2- Square steel pipe, 3- Steel plate, 4- Polyoxymethylene board, 5- Horizontal embedded steel bar, 6- Old bridge box girder flange plate, 7- New bridge box girder flange plate, 8- Short steel bar, 9- Hole. Detailed Implementation

[0030] 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.

[0031] Unless otherwise specified, the functional components or structures in the following embodiments or examples are conventional components or structures used in the art to achieve the corresponding functions.

[0032] To address the issues of longitudinal deformation differences and vertical shear resistance between old and new bridges in a long span, this invention provides a sliding-type transverse connection structure suitable for widening and splicing long-span concrete bridges. This structure is used for widening and splicing old bridges with new ones. Please refer to [further details omitted]. Figures 1 to 3 As shown, the slide-type lateral connection structure includes:

[0033] The core slider is located on the side of the old bridge;

[0034] A longitudinal slide rail located on the side of the new bridge and sliding along the bridge direction to fit the core slider;

[0035] Several transverse pre-embedded steel bars 5 are embedded in the old bridge and extend out at one end to be fixedly connected to the core slider;

[0036] One end is positioned within the core slider along the transverse direction of the bridge, and the other end passes through the core slider and the longitudinal slide, and is fixed to the new bridge by the transverse connecting steel bar 1 in a tensioned state.

[0037] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the core slider includes a square steel pipe 2 with a groove along the bridge direction near the new bridge side, and a steel plate 3 fixed to the upper and lower surfaces of the square steel pipe 2 to form a T-shaped structure. The end of the transverse pre-embedded steel bar 5 is fixed to the steel plate 3. One end of the transverse connecting steel bar 1 is located inside the square steel pipe 2, and its end size is larger than the groove size.

[0038] For more detailed implementation methods, please refer to [link / reference]. Figure 4 As shown, holes 9 are machined along the longitudinal direction of the steel plate 3, and the ends of the transverse pre-embedded reinforcing bars 5 pass through the holes 9 and are welded and fixed to the steel plate 3.

[0039] For more detailed implementation methods, please refer to [link / reference]. Figure 1 As shown, the transverse pre-embedded steel bars 5 are provided in two rows and are respectively fixed to the steel plates 3 above and below the square steel pipe 2.

[0040] For more detailed implementation methods, please refer to [link / reference]. Figure 1 As shown, a short steel bar 8 is welded to the end of the transverse connecting steel bar 1 that extends into the square steel pipe 2, so that the corresponding end of the transverse connecting steel bar 1 is not pulled out after extending into the square steel pipe 2, thus forming a transverse pull-out resistance.

[0041] For some specific implementation methods, please refer to [link / reference]. Figure 3 As shown, the concrete portion of the old bridge near the flange of its box girder has several transverse holes drilled longitudinally, and one end of the transverse pre-embedded steel bar 5 is inserted into the transverse hole with epoxy resin adhesive.

[0042] In some specific embodiments, epoxy mortar is also poured between the core slider and the old bridge. Through the combined action of the transversely embedded steel bars 5 and the poured epoxy mortar, the core structure bears the vertical shear stress.

[0043] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the longitudinal slide includes two symmetrical, angled structures that are respectively attached to the upper and lower sides of the core structure. There is a longitudinal gap between the two angled structures for the transverse connecting steel bar 1 to pass through. After the transverse connecting steel bar 1 passes through the longitudinal gap, wooden strips are inserted into the gap formed by the adjacent transverse connecting steel bar 1 and the angled structure to ensure that there are no gaps.

[0044] In a more specific embodiment, each folded structure is composed of three polyoxymethylene boards 4 spliced ​​together, with adjacent polyoxymethylene boards 4 being assembled vertically.

[0045] Each of the above implementation methods can be implemented individually, or in any combination of two or more.

[0046] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0047] Example 1:

[0048] like Figures 1 to 4As shown, to address the issues of longitudinal deformation differences and vertical shear resistance between the old and new bridges in a long-span bridge, this embodiment provides a sliding transverse connection structure suitable for splicing and widening projects of long-span concrete bridges. This structure includes transverse connecting steel bars 1, square steel pipes 2, steel plates 3, polyoxymethylene boards 4, transverse embedded steel bars 5, the old bridge box girder flange plate 6, and the new bridge box girder flange plate 7. Circular holes are made in the concrete portions of the steel plate 3 and the old bridge box girder flange plate 6. The transverse embedded steel bars 5 are embedded in the concrete after the holes in the old bridge box girder flange plate 6. The steel plate 3 passes through the reserved joint of the transverse embedded steel bars 5 along the hole position (i.e., the position of hole 9), and is fixed to the transverse embedded steel bars 5 by welding. The square steel pipe 2 is welded to the steel plate 3 to form the core slider of the T-shaped structure. Epoxy mortar is poured between the core slider and the old bridge box girder flange plate 6. The transverse connecting steel bar 1 is horizontally inserted into the longitudinal groove of the square steel pipe 2. A short steel bar 8 is welded to the end of the transverse connecting steel bar 1. The steel bar is rotated 90° so that the direction of the short steel bar 8 welded to the end of the transverse connecting steel bar 1 is perpendicular to the direction of the groove of the square steel pipe 2 to prevent the transverse connecting steel bar 1 from being pulled out. The transverse connecting steel bar 1 is tied and fixed to the steel skeleton in the flange plate 7 of the new bridge box girder. An angled structure composed of spliced ​​polyoxymethylene boards 4 is arranged longitudinally on the upper and lower sides of the square steel pipe 2. Wooden strips are inserted into the gaps between the transverse connecting steel bar 1 and the upper and lower angled structures to ensure that there are no gaps. The whole formed can be used as the lateral formwork for the construction of the flange plate 7 of the new bridge box girder, and the flange plate of the new bridge is poured in one go.

[0049] The sliding transverse connection structure in this embodiment, applicable to the splicing and widening of long-span concrete bridges, achieves longitudinal sliding, vertical shear resistance, and transverse tensile resistance. It has a good dissipation effect and resistance to the deformation difference between the old and new bridges after completion, providing a new construction method for the splicing and widening of continuous box girders, and effectively solving a series of problems caused by the splicing and widening of concrete continuous beam bridges under conventional construction methods.

[0050] The specific construction method is as follows:

[0051] First, in the concrete part of the old bridge box girder flange plate 6, transverse holes are drilled at certain intervals along the longitudinal direction. Two holes are drilled symmetrically at the top and bottom of each cross section. The shape of the holes is circular, and the diameter of the circular holes is slightly larger than the diameter of the transverse embedded steel bars 5. After drilling, the embedded steel bars are inserted into the old bridge box girder flange plate 6 with epoxy resin. After the transverse embedded steel bars 5 are inserted, the exposed length is the same as the thickness of the steel plate 3. Steel plates 3 are welded to the upper and lower sides of the square steel pipe 2. Then, holes are drilled in the upper and lower steel plates 3. The two holes are the same shape and are arranged symmetrically at the top and bottom. The opening positions of the steel plates 3 are consistent with the opening positions of the old bridge concrete flange plate in both the longitudinal and vertical directions (the number and position intervals of the openings in the old bridge box girder flange plate 6 and steel plates 3 along the longitudinal direction can be calculated and determined according to the actual project needs). After the transverse pre-embedded steel bar 5 is inserted into the old bridge flange plate, the transverse pre-embedded steel bar 5 is passed through the drilled hole of the steel plate 3 and the two are fixed by welding. At the same time, the square steel pipe 2 and the upper and lower steel plates 3 are welded to form a core slider. Epoxy mortar is poured between this structure and the old bridge flange plate. In the height direction, the upper surface of the upper part of the steel plate 3 is flush with the top of the old bridge box girder flange plate 6, and the lower surface of the lower part of the steel plate 3 is flush with the bottom of the old bridge box girder flange plate 6.

[0052] After the above operations are completed, the polyoxymethylene board 4 is divided into six pieces, which are placed along the outer surfaces of the steel plate 3 and the square steel pipe 2, respectively. These are divided into an upper polyoxymethylene board 4 and a lower polyoxymethylene board 4. The upper and lower polyoxymethylene boards 4 are glued together to form a folded-angle structure, which is fixed to the upper and lower sides of the aforementioned core structure. This structure can serve as a lateral template during the pouring of concrete for the new bridge flange. The folded-angle structure maintains close contact with the core slider, ensuring longitudinal relative sliding deformation.

[0053] Finally, the transverse connecting steel bar 1 is horizontally placed into the slot of the square steel pipe 2, and then the steel bar is rotated 90 degrees to prevent the short steel bar 8 welded to the transverse connecting steel bar 1 from being pulled out. Then, the transverse connecting steel bar 1 is connected to the steel reinforcement skeleton of the new bridge box girder flange by welding or binding. Afterwards, wooden strips are stuffed into the gaps between the transverse connecting steel bar 1 and the upper and lower polyoxymethylene boards 4 to ensure there are no gaps. The resulting whole can then be used as the lateral formwork for the construction of the new bridge box girder flange plate 7. After the above procedures are completed, the new box girder flange can be poured in one go.

[0054] 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 sliding transverse connection structure suitable for splicing and widening long-span concrete bridges, used for splicing and widening old and new bridges, characterized in that, The slide-type lateral connection structure includes: The core slider is located on the side of the old bridge; A longitudinal slide rail located on the side of the new bridge and sliding along the bridge direction to fit the core slider; Several transverse pre-embedded steel bars are embedded in the old bridge and extend out at one end to be fixedly connected to the core slider; One end is positioned in the core slider along the transverse direction of the bridge, and the other end passes through the core slider and the longitudinal slide, and is a transverse connecting steel bar fixed to the new bridge in a tensioned state. The core slider includes a square steel pipe with a slot along the bridge direction near the new bridge side, and a steel plate fixed to the upper and lower surfaces of the square steel pipe to form a T-shaped structure. The end of the transverse pre-embedded steel bar is fixed to the steel plate. One end of the transverse connecting steel bar is located inside the square steel pipe, and its end size is larger than the slot size. A short steel bar is welded to the end of the transverse connecting steel bar that extends into the square steel pipe, so that the corresponding end of the transverse connecting steel bar is not pulled out after extending into the square steel pipe, thus forming a transverse pull-out resistance.

2. The sliding transverse connection structure for splicing and widening long-span concrete bridges according to claim 1, characterized in that, Holes are machined in the steel plate, and the ends of the transversely embedded reinforcing bars pass through the holes and are welded to the steel plate for fixation.

3. A sliding transverse connection structure suitable for splicing and widening long-span concrete bridges according to claim 1, characterized in that, The transverse pre-embedded reinforcing bars are arranged in two rows and are fixed to the steel plates above and below the square steel pipe, respectively.

4. A sliding transverse connection structure suitable for splicing and widening long-span concrete bridges according to claim 1, characterized in that, The concrete portion of the old bridge near the flange of its box girder has several transverse holes drilled longitudinally, and one end of the transverse pre-embedded steel bar is inserted into the transverse hole using epoxy resin adhesive.

5. A sliding transverse connection structure suitable for splicing and widening long-span concrete bridges according to claim 1, characterized in that, Epoxy mortar was also poured between the core slider and the old bridge.

6. A sliding transverse connection structure suitable for splicing and widening long-span concrete bridges according to claim 1, characterized in that, The longitudinal slide rail includes two symmetrical, angled structures that are respectively attached to the upper and lower sides of the core slider. There is a longitudinal gap between the two angled structures for the transverse connecting steel bars to pass through. After the transverse connecting steel bars pass through the longitudinal gap, wooden strips are inserted into the gaps formed by the adjacent transverse connecting steel bars and the angled structures to ensure that there are no gaps.

7. A sliding transverse connection structure suitable for splicing and widening long-span concrete bridges according to claim 6, characterized in that, Each folded structure is composed of three polyoxymethylene (POM) boards spliced ​​together, with adjacent POM boards assembled vertically.

8. A bridge widening project by splicing old and new bridges, comprising an old bridge, a new bridge, and a sliding transverse connection structure as described in any one of claims 1-7 between the old bridge and the new bridge.

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