A swingable thin-walled hollow high-pier structure and a construction method thereof

Abstract

The application provides a swingable thin-wall hollow high pier structure and relates to the technical field of bridge engineering, which comprises a pier base and a pier body, wherein the pier base is fixed through a concrete foundation and comprises a lower steel plate, an upper steel plate and a low-yield-point steel plate arranged between the upper and lower steel plates; the low-yield-point steel plate is arranged at the two ends of the upper and lower steel plates so that the middle part between the upper and lower steel plates is suspended to form a deformation space; the pier body is fixed with the pier base and comprises an FRP layer and a rubber layer arranged on the inner side of the FRP layer; the FRP layer is enclosed to form a cavity; a support steel plate is arranged in the cavity; the support steel plate divides the cavity into at least two regions; a steel pipe is arranged in at least one of the regions; the support steel plate and the steel pipe are welded and fixed with the upper steel plate; a hollow layer is formed in the steel pipe; and a concrete layer is arranged on the inner wall of the cavity to the outer side of the steel pipe. Thus, the problems that the existing pier steel pipe is prone to rust and the overall bearing capacity is poor when being pressed are solved. The application further provides a construction method of the swingable thin-wall hollow high pier structure.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and more specifically, to a swayable thin-walled hollow high pier structure and its construction method. Background Technology

[0002] With the continuous development of bridge engineering in my country, steel-concrete composite bridge piers have been widely used. As a commonly used composite structure, steel-concrete composite mainly consists of compression members with relatively small axial compressive stress and force eccentricity. It has advantages such as convenient construction, good ductility, high load-bearing capacity, fatigue resistance, excellent seismic performance, and certain fire resistance. However, corrosion of the steel pipe is the most significant factor affecting the durability of this structure. Furthermore, if the internal steel plates buckle, the restraining capacity on the concrete will be greatly reduced, thus affecting the overall load-bearing capacity. my country is a country prone to earthquakes, and bridge engineering is a crucial component of railway engineering; damage to bridges in an earthquake would inevitably lead to incalculable losses. Summary of the Invention

[0003] This invention discloses a swayable thin-walled hollow high pier structure, which aims to improve the problems of existing bridge pier steel pipes being prone to corrosion and having poor overall bearing capacity under pressure.

[0004] The present invention adopts the following solution:

[0005] A swayable thin-walled hollow high pier structure includes a pier base and a pier body. The pier base is fixed by a concrete foundation and includes a lower steel plate, an upper steel plate, and a low-yield-point steel plate disposed between the upper and lower steel plates. The low-yield-point steel plate is placed at both ends of the upper and lower steel plates, so that the middle part between the upper and lower steel plates is suspended to form a deformation space. The pier body is fixed to the pier base and includes an FRP layer and a rubber layer disposed on the inner side of the FRP layer. The FRP layer encloses a cavity, and a supporting steel plate is placed inside the cavity. The supporting steel plate divides the cavity into at least two regions, and a steel pipe is placed in at least one region. The supporting steel plate and the steel pipe are both welded and fixed to the upper steel plate. A hollow layer is formed inside the steel pipe, and a concrete layer is provided from the inner wall of the cavity to the outer side of the steel pipe.

[0006] As a further improvement, the lower steel plate is welded with reinforcing bars, and the upper steel plate, the low yield point steel plate and the lower steel plate are welded in sequence and fastened with bolts.

[0007] As a further improvement, the supporting steel plates are arranged in a grid pattern to divide the cavity into eight regions, with steel pipes installed in the four central regions.

[0008] As a further improvement, the upper steel plate is welded with a plurality of steel structural column feet for positioning the FRP layer, and the bottom of the FRP layer is provided with an assembly groove corresponding to each of the steel structural column feet. The assembly groove engages with the steel structural column feet to position the FRP layer.

[0009] As a further improvement, a top steel plate is installed on the top of the pier body.

[0010] As a further improvement, the supporting steel plate and the steel pipe are welded section by section from the upper steel plate to the top steel plate, and then welded to the top steel plate.

[0011] As a further improvement, the concrete layer is made of rubber concrete.

[0012] As a further improvement, the rubber layer is made of recycled waste rubber.

[0013] As a further improvement, the rubber layer is bonded to the inner wall of the FRP layer by an adhesive material.

[0014] Another method for constructing a swingable thin-walled hollow high pier structure as described above includes the following steps:

[0015] Step 1: Weld the lower steel plate to the reinforcing bars, pour the concrete foundation, insert bolts and screw the first nut on top of the lower steel plate, and weld the first nut to the lower steel plate;

[0016] Step 2: Weld the low yield point steel plate to the lower steel plate;

[0017] Step 3: Weld the upper steel plate to the low yield point steel plate, tighten the second and third nuts on both sides of the upper steel plate, and weld the second and third nuts to the upper steel plate respectively;

[0018] Step 4: Weld the supporting steel plate and steel pipe section by section from the top steel plate to the preset height;

[0019] Step 5: Pre-fabricate the FRP layer and bond a rubber layer to the inner wall of the FRP layer;

[0020] Step 6: Weld steel structure column bases onto the upper steel plate, and fit and limit the FRP layer with each steel structure column base;

[0021] Step 7: Pour rubber concrete into the area inside the FRP layer but outside the steel pipe to form a concrete layer;

[0022] Step 8: Weld the top steel plate to the supporting steel plate and steel pipe.

[0023] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0024] 1. The FRP layer on the outermost side of the pier body enables the pier to be used in various harsh environments, thus solving the problem of corrosion of steel pipes in harsh environments.

[0025] 2. Under structural compression, the concrete layer is the primary load-bearing component, with supporting steel plates and pipes acting as internal confinement materials, thus initially enhancing the load-bearing capacity of the concrete layer. As the concrete layer undergoes lateral deformation, the rubber layer is compressed, and the rubber layer then evenly distributes the pressure to the FRP layer. The confinement effect of the FRP layer further enhances the load-bearing capacity of the concrete layer, fully utilizing its compressive strength. Simultaneously, the rubber layer provides a buffering effect, preventing brittle failure of the FRP layer. When the structure is subjected to lateral forces (such as earthquakes), the low-yield-point steel plate at the bottom deforms first, allowing the entire structure to sway slightly from side to side, achieving vibration energy dissipation. This solves the problem of poor overall load-bearing capacity of existing bridge piers under compression. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a structural schematic diagram of one embodiment of the present invention (concealed concrete foundation);

[0028] Figure 2 This is a front view of one embodiment of the present invention;

[0029] Figure 3 yes Figure 2 A cross-sectional view along one of its sections;

[0030] Figures 4 to 7 This is a schematic diagram of the construction procedure of one embodiment of the present invention.

[0031] icon:

[0032] 1-Pier base; 11-Concrete foundation; 12-Lower steel plate; 13-Upper steel plate; 14-Low yield point steel plate; 15-Reinforcing bar; 16-Bolt; 17-Nut; 18-Steel structure column base;

[0033] 2-Pier body; 21-FRP layer; 22-Rubber layer; 23-Supporting steel plate; 24-Steel pipe; 25-Concrete layer; 26-Top steel plate. Detailed Implementation

[0034] 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.

[0035] Example

[0036] Combination Figures 1 to 3 This embodiment provides a swayable thin-walled hollow high pier structure, including a pier base 1 and a pier body 2. The pier base 1 is fixed by a concrete foundation 11 and includes a lower steel plate 12, an upper steel plate 13, and a low-yield-point steel plate 14 disposed between the upper and lower steel plates. Reinforcing bars 15 are welded to the lower steel plate 12. The upper steel plate 13, the low-yield-point steel plate 14, and the lower steel plate 12 are sequentially welded together and secured with bolts 16. Nuts 17 on the bolts 16 are tightened and then welded to the corresponding steel plates. The low-yield-point steel plate 14 is placed at both ends of the upper and lower steel plates, creating a deformation space by suspending the middle portion between the upper and lower steel plates.

[0037] The pier body 2 is fixed to the pier base 1 and includes an FRP layer 21 and a rubber layer 22 fitted inside the FRP layer 21. The FRP layer 21 encloses a cavity, within which a supporting steel plate 23 is installed. The supporting steel plate 23 divides the cavity into at least two regions, with a steel pipe 24 installed in at least one region. Both the supporting steel plate 23 and the steel pipe 24 are welded and fixed to the upper steel plate 13. The steel pipe 24 has a hollow interior, and a concrete layer 25 is provided from the inner wall of the cavity to the outer side of the steel pipe 24. Preferably, the supporting steel plate 23 is arranged in a grid pattern to divide the cavity into eight regions, with the steel pipe 24 installed in each of the four central regions. The grid-like arrangement of the supporting steel plate 23 acts as a load-bearing skeleton, providing sufficient load-bearing capacity.

[0038] Specifically, a top steel plate 26 is installed on the top of the pier body 2. Supporting steel plates 23 and steel pipes 24 are welded section by section from the upper steel plate 13 to the top steel plate 26 and then welded to the top steel plate 26. Multiple steel structural column feet 18 for positioning the FRP layer 21 are welded to the upper steel plate 13. The bottom of the FRP layer 21 is provided with an assembly groove corresponding to each of the steel structural column feet 18. The assembly groove engages with the steel structural column feet 18 to position the FRP layer 21. This is not limited to this and is not specifically restricted.

[0039] It should be noted that the FRP layer 21 is made of fiber-reinforced polymer (FRP), a material with high specific strength, high specific modulus, good corrosion resistance, good durability, and a coefficient of thermal expansion similar to that of concrete. Due to its good corrosion resistance, using FRP as the outermost layer of the bridge pier can solve the corrosion problem of the steel pipe 24 in harsh environments (such as saline-alkali soil).

[0040] In this embodiment, a low-yield-point steel plate 14 is used between the upper and lower steel plates, and the low-yield-point steel plate 14 is positioned at both ends of the upper and lower steel plates, creating a deformation space by suspending the middle between the upper and lower steel plates. During an earthquake or when a train passes, the entire structure can sway slightly, thereby achieving the purpose of energy dissipation and vibration reduction. The FRP layer 21 on the outermost side of the pier body 2 allows the pier to be used in various harsh environments, such as saline-alkali land and freeze-thaw land in western regions; the FRP layer 21 can also be prefabricated as a construction template to improve construction efficiency. In addition, the rubber layer 22 can solve the problem of the high brittleness of FRP material, acting as a stress buffer to prevent the FRP layer 21 from brittle fracture.

[0041] When the structure is under compression, the concrete layer 25 is the main load-bearing component, with the supporting steel plate 23 and steel pipe 24 acting as internal restraint materials, thus initially increasing the load-bearing capacity of the concrete layer 25. As the concrete layer 25 deforms laterally, the rubber layer 22 is compressed, and the rubber layer 22 then evenly transfers the pressure to the FRP layer 21. The restraining effect of the FRP layer 21 further increases the load-bearing capacity of the concrete layer 25, fully utilizing its compressive strength. Simultaneously, the rubber layer 22 provides a buffering effect, preventing brittle failure of the FRP layer 21. When the structure is subjected to lateral forces (such as earthquakes), the low-yield-point steel plate 14 at the bottom deforms first, allowing the entire structure to sway slightly from side to side, thereby solving the problem of poor load-bearing capacity of existing bridge piers under compression.

[0042] Based on the above embodiments, in an optional embodiment of the present invention, the rubber layer 22 is made of recycled waste rubber and is bonded to the inner wall of the FRP layer 21 by an adhesive material, preferably an adhesive resin. Furthermore, the concrete layer 25 is cast from rubber concrete, which has a lower strength than ordinary concrete. The FRP layer 21 can effectively restrain it, thereby improving the mechanical properties of the rubber concrete. Concrete with added rubber aggregate can significantly improve the toughness and durability (frost resistance, fatigue resistance, and impermeability) of concrete, making it better suited to harsh environments. Simultaneously, the added rubber aggregate can be sourced from waste rubber resources such as waste car tires, achieving resource recycling and reuse, and actively responding to the call for environmental protection.

[0043] Combination Figures 4 to 7 The present invention further provides a construction method for the above-mentioned swayable thin-walled hollow high pier structure, comprising the following steps:

[0044] Step 1: Weld the lower steel plate 12 and the reinforcing bar 15 into a whole, pour the concrete foundation 11, insert the bolts 16 at the same time, and screw the nuts 17 into the lower steel plate 12, and weld the nuts 17 to the lower steel plate 12.

[0045] Step 2: Weld the low yield point steel plate 14 to the lower steel plate 12, wherein the low yield point steel plate 14 is made of steel with a yield point lower than that of the lower steel plate 12 and the upper steel plate 13;

[0046] Step 3: Place the upper steel plate 13 on the low yield point steel plate 14 and weld it to the low yield point steel plate 14. At the same time, tighten the nuts 17 on both sides of the upper steel plate 13 and weld the nuts 17 to the upper steel plate 13.

[0047] Step 4: Weld the supporting steel plate 23 and steel pipe 24 section by section from the upper steel plate 13 to the preset height;

[0048] Step 5: Prefabricate the FRP layer 21 and bond the rubber layer 22 to the inner wall of the FRP layer 21;

[0049] Step 6: Weld steel structure column feet 18 onto the upper steel plate 13, and fit and limit the FRP layer 21 with each steel structure column foot 18; specifically, align and insert the assembly groove of the FRP layer 21 into the steel structure column foot 18 to engage and limit the position of the steel structure column foot 18.

[0050] Step 7: Pour rubber concrete into the area inside the FRP layer 21 and outside the steel pipe 24 to form the concrete layer 25;

[0051] Step 8: Weld the top steel plate 26 to the supporting steel plate 23 and the steel pipe 24.

[0052] 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.

Claims

1. A swingable thin-walled hollow high-pier structure, comprising a pier base and a pier body, characterized in that the pier base is fixed by a concrete foundation and comprises a lower steel plate, an upper steel plate and a low yield point steel plate arranged between the upper and lower steel plates, the low yield point steel plate is arranged at both ends of the upper and lower steel plates to form a deformation space in the middle of the upper and lower steel plates; the pier body is fixed with the pier base and comprises an FRP layer and a rubber layer arranged on the inner side of the FRP layer, the FRP layer is enclosed to form a cavity, a support steel plate is arranged in the cavity, the cavity is at least divided into two regions by the support steel plate, at least one of the regions is provided with a steel pipe, the support steel plate and the steel pipe are welded and fixed with the upper steel plate, a hollow layer is formed in the steel pipe, a concrete layer is arranged on the inner wall of the cavity to the outer side of the steel pipe; a steel bar is welded on the lower steel plate, the upper steel plate, the low yield point steel plate and the lower steel plate are sequentially welded and fastened by bolts; the support steel plate is arranged in a grid shape to divide the cavity into eight regions, and a steel pipe is arranged in each of the four middle regions. A plurality of steel structure column feet are welded on the upper steel plate to position the FRP layer, the FRP layer is provided with assembly grooves at the bottom corresponding to each steel structure column foot, the assembly grooves are engaged with the steel structure column feet to position the FRP layer. A top steel plate is arranged at the top of the pier body.

2. The swayable thin-walled hollow high-pier structure according to claim 1, characterized in that, The support steel plate and the steel pipe are welded from the upper steel plate to the top steel plate in sections.

3. The swayable thin-walled hollow high-pier structure according to claim 1, characterized in that, The concrete layer is formed by pouring rubber concrete.

4. The swayable thin-walled hollow high-pier structure according to claim 3, characterized in that, The rubber layer is made of waste and recycled rubber.

5. The swayable thin-walled hollow high-pier structure according to any one of claims 1-4, characterized in that, The rubber layer is adhered to the inner wall of the FRP layer by an adhesive material.

6. The swayable thin-walled hollow high pier structure according to any one of claims 1-4, characterized in that, The method comprises the following steps:

7. The swayable thin-walled hollow high-pier structure according to claim 6, characterized in that Step 1: weld the lower steel plate with the steel bar, pour the concrete foundation, insert the bolts and screw the first nut above the lower steel plate, and weld the first nut with the lower steel plate; 8. The construction method of a swingable thin-walled hollow high-pier structure according to claim 1, characterized in that, Step 2: weld the low yield point steel plate with the lower steel plate; Step 3: weld the upper steel plate with the low yield point steel plate, and tighten the nuts on both sides of the upper steel plate and weld the nuts with the upper steel plate; Step 4: weld the support steel plate and the steel pipe from the upper steel plate to the preset height in sections; Step 5: precast the FRP layer and adhere the rubber layer to the inner wall of the FRP layer; Step 6: weld the steel structure column feet on the upper steel plate, and fit and limit the FRP layer with each steel structure column foot; Step 7: pour rubber concrete in the area outside the steel pipe within the FRP layer to form a concrete layer; Step 8: weld the top steel plate with the support steel plate and the steel pipe. ​ ​

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