An FRP-steel-concrete composite bridge pier and its preparation method

Abstract

This invention provides an FRP pipe-steel-concrete composite bridge pier, the pier body of which is composed of an outer FRP pipe and an inner steel pipe and dry plate, and then filled with concrete. The outer FRP pipe has good corrosion resistance, which can effectively prevent itself and the internal concrete from being corroded. The inner steel pipe and steel plate can effectively enhance the strength, load-bearing capacity and durability of the pier body. The absence of concrete inside the steel pipe gives the pier body good ductility. At the same time, after the bridge pier is maintained, replaced or abandoned in the later stage, the outer FRP pipe is easy to remove, which facilitates the removal of concrete and the recycling of steel.

Description

Technical Field

[0001] This invention relates to the field of bridge structure technology, and more specifically, to an FRP pipe-steel-concrete composite bridge pier and its preparation method. Background Technology

[0002] Compared to traditional reinforced concrete structures, steel structures offer advantages such as lightweight and high strength, large span, reusability, good ductility, and industrialized production. They are widely used in civil engineering, especially in bridge engineering, where they not only allow for aesthetically pleasing bridge designs but also offer advantages like short construction cycles and controllable quality, aligning with the national emphasis on green, environmentally friendly, and sustainable development. However, current steel-concrete composite piers typically consist of steel pipe columns filled with concrete. Since the steel pipes are directly exposed, corrosion is a concern. For example, in near-shore environments, the high chloride ion content in the atmosphere, with its strong hygroscopic and corrosive properties, further accelerates steel corrosion, reducing its strength and severely impacting the pier's load-bearing capacity and durability. For large piers, the large outer steel pipe undoubtedly increases costs. Furthermore, after maintenance, replacement, or disposal, the presence of the outer steel pipe makes it difficult to remove the internal concrete, hindering steel recycling. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an FRP pipe-steel-concrete composite bridge pier and its preparation method to solve the above problems.

[0004] The present invention adopts the following solution:

[0005] This application provides an FRP pipe-steel-concrete composite bridge pier, including a pier cap and a pier body connected to the pier cap; the pier body includes a bottom steel plate, a hollow FRP pipe column, multiple steel pipes, and multiple steel plates; the bottom steel plate is connected to the pier cap; multiple steel plates are connected to the bottom steel plate, placed inside the FRP pipe column, and form multiple cavities along the vertical direction; the steel pipes are connected to the bottom steel plate and placed inside the cavities; a casting cavity is formed between the steel plates, the steel pipes, and the FRP pipe column; concrete is poured into the casting cavity.

[0006] Furthermore, a connecting groove is formed on the support platform; a connecting steel plate is pre-installed on the connecting groove; the bottom steel plate is connected to the connecting steel plate by bolts; and concrete is poured inside the support platform.

[0007] Furthermore, the bottom of the connecting steel plate is also connected to multiple L-shaped steel bars.

[0008] Furthermore, at least one reinforcing steel plate is connected to the bottom side of the steel pipe.

[0009] Furthermore, the outer side of the steel pipe is also connected to multiple shear studs.

[0010] Furthermore, it also includes a cap beam connected to the pier.

[0011] Furthermore, it includes three steel plates and three steel pipes; the three steel plates are placed inside the FRP column and form three vertically square cavities; the three steel pipes are respectively placed in the three cavities.

[0012] This invention provides an FRP pipe-steel-concrete composite bridge pier, the pier body of which is composed of an outer FRP pipe and an inner steel pipe and dry plate, and then filled with concrete. The outer FRP pipe has good corrosion resistance, which can effectively prevent itself and the internal concrete from being corroded. The inner steel pipe and steel plate can effectively enhance the strength, load-bearing capacity and durability of the pier body. The absence of concrete inside the steel pipe gives the pier body good ductility. At the same time, after the bridge pier is maintained, replaced or abandoned in the later stage, the outer FRP pipe is easy to remove, which facilitates the removal of concrete and the recycling of steel.

[0013] The present invention also provides a method for preparing the aforementioned FRP-steel-concrete bridge pier, comprising the following steps: S1: Construct a foundation at a designated location on the construction site, pour rubber concrete into the foundation, and pre-install connecting bolts on the connecting steel plate on the connecting groove of the foundation; process the pier body, including welding multiple steel plates together and welding one end of each plate to the bottom steel plate; prefabricate hollow FRP pipe columns and prefabricate cap beams. S2: Connect and fix the bottom steel plate of the pier body to the connecting steel plate on the bearing platform with bolts, and then put the FRP pipe column on the outside of the steel plate and place it on the connecting groove of the bearing platform; S3: Concrete is poured into the casting cavity formed between the steel plate, steel pipe and FRP pipe column; S4: Connect the cap beam to the pier body using shear keys.

[0014] This invention provides a method for preparing an FRP pipe-steel-concrete composite bridge pier. The outer FRP pipe, steel frame, and cap beam of the pier body can all be prefabricated separately. Only the outer FRP pipe and steel frame need to be assembled with the pier body and concrete poured. Moreover, the FRP pipe of the outer pier body is part of the structure, eliminating the need for later formwork removal, which greatly shortens the construction period and saves manpower, material resources, and financial resources. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an FRP pipe-steel-concrete composite bridge pier according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of an FRP pipe-steel-concrete composite bridge pier according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the pier cap structure of an FRP pipe-steel-concrete composite bridge pier according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a partial assembly structure of an FRP pipe-steel-concrete composite bridge pier according to an embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of a partial assembly structure of an FRP pipe-steel-concrete composite bridge pier according to an embodiment of the present invention. Figure 2 ; Icons: 1. Foundation, 2. Bottom steel plate, 3. FRP pipe column, 4. Connecting groove, 5. Connecting steel plate, 6. Reinforcing steel plate, 8. Cap beam, 9. Bolt, 10. L-shaped steel bar, 11. Steel pipe, 12. Steel plate, 13. Concrete. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example Combination Figures 1 to 5As shown, this embodiment provides an FRP pipe-steel-concrete composite bridge pier, including a pier cap 1 and a pier body connected to the pier cap 1; the pier body includes a bottom steel plate 2, hollow FRP pipe columns 3, three steel pipes 11, and three steel plates 12; a connecting groove 4 is formed on the pier cap 1; a connecting steel plate 5 is pre-installed on the connecting groove 4; the bottom steel plate 2 is connected to the connecting steel plate 5 by bolts 9; concrete 13 is poured inside the pier cap 1; multiple L-shaped steel bars 10 are also connected to the bottom of the connecting steel plate 5 to strengthen the connection between the connecting steel plate 5 and the pier cap 1. The connection strength of platform 1; a reinforcing steel plate 6 is also connected to the bottom side of the steel pipe 11; one side of the three steel plates 12 is welded in the vertical direction, and one end is welded to the bottom steel plate 2 and placed inside the FRP pipe column 3; multiple vertical cavities are formed between the three steel plates 12 and the FRP pipe column 3; one end of the steel pipe 11 with the reinforcing steel plate 6 is welded to the bottom steel plate 2 and placed inside the cavity; a casting cavity is formed between the steel plates 12, the steel pipe 11 and the FRP pipe column 3; concrete 13 is poured into the casting cavity. This embodiment also includes a cap beam 8 connected to the pier body, and the bottom of the cap beam 8 is provided with multiple shear keys that are compatible with the steel pipe 11, which can be directly and conveniently assembled with the steel pipe 11 through the shear keys.

[0019] The outer FRP pipe has good corrosion resistance, effectively preventing corrosion of itself and the internal concrete 13. The internal steel pipe 11 and steel plate 12 effectively enhance the strength, load-bearing capacity, and durability of the pier. The absence of concrete 13 inside the steel pipe 11 ensures good ductility of the pier. Furthermore, in later maintenance, replacement, or disposal of the pier, the outer FRP pipe is easily removed, facilitating the removal of the concrete 13 and the recycling of the steel. This pier is suitable for various complex environments, such as seawater, freeze-thawed areas in the north, and saline-alkali land in the west.

[0020] Furthermore, the outer side of the steel pipe 11 is also connected with a plurality of shear studs, which can enhance the interface connection between the steel pipe 11 and the concrete 13.

[0021] The present invention also provides a method for preparing the aforementioned FRP-steel-concrete bridge pier, comprising the following steps: S1: Construct a foundation 1 at a designated location on the construction site, pour rubber concrete 13 into the foundation 1, and pre-install connecting bolts 9 on the connecting steel plate 5 on the connecting groove 4 of the foundation 1; process the pier body, including welding multiple steel plates 12 together and welding one end of them to the bottom steel plate 2; prefabricate hollow FRP pipe column 3 and prefabricate cap beam 8. S2: Connect and fix the bottom steel plate 2 of the pier body to the connecting steel plate 5 on the foundation 1 with bolts 9, and then put the FRP pipe column 3 on the outside of the steel plate 12 and place it on the connecting groove 4 of the foundation 1. S3: Pour concrete 13 into the casting cavity formed between the steel plate 12, the steel pipe 11 and the FRP pipe column 3. S4: Connect the cap beam 8 to the pier.

[0022] This invention provides a method for preparing an FRP pipe-steel-concrete composite bridge pier. The pier cap 1, the outer FRP pipe of the pier body, the steel frame and the cap beam 8 can all be prefabricated separately. Only the outer FRP pipe and the steel frame need to be assembled on the pier cap 1 and the concrete 13 needs to be poured. Moreover, the FRP pipe of the outer layer of the pier body is part of the structure, eliminating the need for later formwork removal, which greatly shortens the construction period and saves manpower, material resources and financial resources.

[0023] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. An FRP tube-steel-concrete hybrid bridge pier, characterized by, The system includes a foundation, a pier connected to the foundation, and a cap beam connected to the pier. The pier includes a bottom steel plate, a hollow FRP (fiberglass reinforced plastic) pipe column, multiple steel pipes, and multiple steel plates. One side of each steel plate is vertically welded to the others, and one end of each steel plate is welded to the bottom steel plate. The steel plates are placed inside the FRP pipe column, forming multiple vertically extending cavities together with the FRP pipe column. The steel pipes are connected to the bottom steel plate and placed within the cavities. A casting cavity is formed between the steel plates, the steel pipes, and the FRP pipe column. Concrete is poured into the casting cavity. A connecting groove is formed on the bearing platform; a connecting steel plate is pre-installed on the connecting groove; multiple L-shaped reinforcing bars are connected to the bottom of the connecting steel plate; the bottom steel plate is connected to the connecting steel plate by bolts; concrete is poured inside the bearing platform. At least one reinforcing steel plate is also connected to the bottom side of the steel pipe.

2. The FRP tube-steel-concrete hybrid bridge pier according to claim 1, characterized by, The outer side of the steel pipe is also connected to multiple shear studs.

3. The FRP tube-steel-concrete hybrid bridge pier according to claim 1, characterized in that, It includes three steel plates and three steel pipes; the three steel plates are placed inside the FRP pipe column and form three vertically square cavities; the three steel pipes are respectively placed in the three cavities.

4. A method of producing the FRP tube-steel-concrete composite pier according to any one of claims 1 to 3, characterized by, Includes the following steps: S1: Construct a foundation at a designated location on the construction site, pour rubber concrete into the foundation, and pre-install connecting bolts on the connecting steel plate on the connecting groove of the foundation; process the pier body, including welding multiple steel plates together and welding one end of each plate to the bottom steel plate; prefabricate hollow FRP pipe columns and prefabricate cap beams. S2: Connect and fix the bottom steel plate of the pier body to the connecting steel plate on the bearing platform with bolts, and then put the FRP pipe column on the outside of the steel plate and place it on the connecting groove of the bearing platform; S3: Concrete is poured into the casting cavity formed between the steel plate, steel pipe and FRP pipe column; S4: Connect the cap beam to the pier body using shear keys.

Images