Prefabricated assembled bridge pier and construction method thereof

Abstract

The present invention discloses a prefabricated and assembled bridge pier and its construction method, which relates to the field of bridge technology. The prefabricated and assembled bridge pier may include: a cap foundation, wherein a first main reinforcement extending in a horizontal direction and a second main reinforcement extending in a vertical direction are provided within the cap foundation; a cylindrical body, wherein the lower end of the cylindrical body has symmetrical through-holes, wherein the through-holes extend below the upper end surface of the cap foundation, and the first main reinforcement is passed through the symmetrical through-holes; a prefabricated bridge pier disposed in the cylindrical body, wherein the prefabricated bridge pier has a third main reinforcement extending in a vertical direction, wherein the third main reinforcement is connected to the second main reinforcement via a grouting sleeve, and concrete is poured between the prefabricated bridge pier and the cylindrical body. This application can improve its own load-bearing performance for use in areas of high seismic intensity, thereby compensating for deficiencies in this area.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a prefabricated assembled bridge pier and a construction method thereof. Background Art

[0002] Prefabricated bridge piers are prefabricated, assembled structures that can be freely disassembled and quickly erected. They can be used for bridge construction, repairing damaged bridges, and even in military applications. Prefabricated piers prefabricate their components in segments and then assemble and connect them into a monolithic structure. Their design focuses on standardization of pier segments, segment connections, and the connection between piers and abutments, as well as leveraging current BIM information management technology to accelerate construction efficiency and facilitate operational lifecycle management. Of these, standardization of segment connections, pier-abutment connections, and seismic design for areas of high seismic intensity are paramount.

[0003] It's worth noting that bridges using prefabricated technology, such as the Shanghai Yangtze River Bridge, Jintang Bridge, and Pearl River Bridge, are all located in areas with a seismic intensity of 6, where seismic fortification requirements are relatively low and, therefore, the requirements for prefabricated assembly technology are relatively low. However, in areas with a seismic intensity of 8 or higher, prefabricated bridge piers have not yet been widely used in high-intensity earthquake zones. Therefore, further research is needed on the structural design and research of prefabricated bridge piers in these areas. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a prefabricated and assembled bridge pier and a construction method thereof, which can improve its own stress-bearing performance for application in high seismic intensity areas (8 degrees and above), thereby making up for the shortcomings in this regard.

[0005] The specific technical solution of the embodiment of the present invention is:

[0006] A prefabricated and assembled bridge pier, comprising:

[0007] A cap foundation, wherein a first main reinforcement extending in a horizontal direction and a second main reinforcement extending in a vertical direction are provided in the cap foundation;

[0008] a cylindrical body, wherein the lower end of the cylindrical body has symmetrical through holes, the through holes extending below the upper end surface of the cap foundation, and the first main reinforcement is passed through the symmetrical through holes;

[0009] A prefabricated bridge pier is arranged in the cylinder, wherein the prefabricated bridge pier has a third main reinforcement extending in a vertical direction, the third main reinforcement is connected to the second main reinforcement via a grouting sleeve, and concrete is poured between the prefabricated bridge pier and the cylinder.

[0010] Preferably, the cylinder is made of steel, and the thickness of the side wall of the cylinder is greater than or equal to 12 mm.

[0011] Preferably, the cross-sectional shape of the cylinder corresponds to the cross-sectional shape of the prefabricated bridge pier.

[0012] Preferably, there are multiple symmetrical through holes; there are multiple first main ribs, and the first main ribs that partially pass through the symmetrical through holes are perpendicular to the first main ribs that partially pass through the symmetrical through holes.

[0013] Preferably, the depth of the lower end of the cylinder extending into the upper end surface of the platform foundation is at least 30 cm.

[0014] Preferably, the grouting sleeve is pre-buried in the cap foundation; the third main reinforcement of the prefabricated pier extends out of the lower end surface of the prefabricated pier to be inserted into the grouting sleeve in the cap foundation.

[0015] Preferably, the length of the third main reinforcement of the prefabricated bridge pier extending from the lower end surface of the prefabricated bridge pier is at least 32 cm.

[0016] Preferably, the cap foundation has an injection channel and an outflow channel connected to the grouting sleeve.

[0017] Preferably, the lower end surface of the cylinder has an extension portion extending away from the axis of the cylinder.

[0018] A construction method for a prefabricated and assembled bridge pier, comprising the following steps:

[0019] During the process of tying the steel bars of the cap foundation, the cylinder is set at the cap foundation, the first main reinforcement extending in the horizontal direction of the cap foundation is passed through the symmetrical through-holes at the lower end of the cylinder, and the upper end of the second main reinforcement extending in the vertical direction of the cap foundation is installed with a grouting sleeve;

[0020] After the reinforcement of the cap foundation is tied, the cap foundation is poured so that the upper end surface of the cap foundation after pouring is higher than the through hole, and an injection channel and an outflow channel connected to the grouting sleeve are formed in the cap foundation;

[0021] Hoisting the prefabricated bridge pier into the cylinder, and inserting the third main reinforcement extending from the lower end of the prefabricated bridge pier into the grouting sleeve in the cap foundation;

[0022] injecting cement slurry into the grouting sleeve through the injection channel until the cement slurry flows out of the outflow channel;

[0023] After the grouting sleeve is injected with cement slurry, concrete is poured into the gap between the cylinder and the prefabricated bridge pier to form the cylinder and the prefabricated bridge pier into a whole.

[0024] The technical solution of the present invention has the following significant beneficial effects:

[0025] In the present application, the prefabricated and assembled bridge pier is formed by covering a cylinder on the prefabricated bridge pier that can be assembled. The cylinder itself is directly fixedly connected to the first main reinforcement in the pedestal foundation and the cylinder is partially cast in the pedestal foundation. The cylinder replaces the steel bars that need to be added in the prefabricated bridge pier for additional strength. The reinforcement effect is achieved through the combined effect of the first main reinforcement passing through the through hole of the cylinder and the cylinder being partially cast in the pedestal foundation, thereby changing the stiffness and seismic performance of the prefabricated and assembled bridge pier.

[0026] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0028] Figure 1 Schematic diagram of the cross-sectional structure of the prefabricated assembled bridge pier in an embodiment of the present invention.

[0029] Reference numerals in the above drawings:

[0030] 1. Cap foundation; 11. First main reinforcement; 12. Second main reinforcement; 13. Injection channel; 14. Outflow channel; 15. Grouting sleeve; 2. Cylinder; 21. Extension; 22. Shear key; 3. Precast pier; 31. Third main reinforcement; 4. Concrete. DETAILED DESCRIPTION

[0031] The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are for illustrative purposes only and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, skilled artisans can conceive of any possible variations based on the present invention, all of which should be considered within the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, internal communication between two elements, direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] The applicant found that among the existing prefabricated bridge piers in China, grouting sleeves are often used for connections between segments. However, the connection between the pier body and the abutment can be divided into two types: the socket-and-spigot connection and the grouting sleeve connection. The basic concept of the socket-and-spigot connection is to insert the prefabricated pier column into the reserved hole in the abutment, lay mortar at the bottom and fill the surrounding area with fine stone concrete, and then cast the connection. Due to the short connection length, this connection method has poor seismic and shear resistance.

[0034] The grouting sleeve connection is generally divided into two forms: external connection of the abutment and internal connection of the abutment. When the abutment is cast in situ, the pier steel bars are embedded in advance, and the socket size is reserved above the top surface of the abutment. The grouting sleeve is embedded in the bottom of the pier. The prefabricated pier is hoisted, and the embedded steel bars of the abutment are inserted into the sleeve at the bottom of the prefabricated pier, and the connection is completed by grouting. The internal connection of the abutment is to embed the grouting sleeve in the abutment, and the insertion length of the steel bars at the bottom of the pier is reserved. After hoisting and insertion, the grouting connection is carried out. Although the external connection of the abutment is more convenient to construct than the internal connection of the abutment, the internal connection of the abutment has superior stress-bearing performance than the external connection of the abutment, especially the seismic performance.

[0035] Some provinces and cities within China, such as Shanghai, Chengdu, and Changsha, have also implemented the design and construction of prefabricated bridge piers based on their specific characteristics. Some cities have also begun experimental design and construction. Provinces like Shanghai and Sichuan have successively issued or are in the process of formulating local standards for prefabricated and assembled bridge piers. However, most of these areas are located in central and eastern China, regions with relatively low seismic intensity. This limits the scope of application and has resulted in the lack of a mature, comprehensive standard system, particularly for areas with high seismic intensity.

[0036] In view of the above situation, in order to improve its own bearing performance so as to be used in high seismic intensity areas (8 degrees and above), thereby making up for the shortcomings in this regard, the applicant proposed a prefabricated assembled bridge pier in this application. Figure 1 FIG. 1 is a schematic diagram of the cross-sectional structure of a prefabricated assembled bridge pier according to an embodiment of the present invention. Figure 1 As shown, the prefabricated assembled bridge pier may include: a cap foundation 1, in which a first main reinforcement 11 extending in the horizontal direction and a second main reinforcement 12 extending in the vertical direction are provided; a cylinder 2, the lower end of the cylinder 2 having symmetrical through holes, the through holes extending below the upper end surface of the cap foundation 1, and the first main reinforcement 11 passing through the symmetrical through holes; a prefabricated bridge pier 3 arranged in the cylinder 2, the prefabricated bridge pier 3 having a third main reinforcement 31 extending in the vertical direction, the third main reinforcement 31 and the second main reinforcement 12 being connected by a grouting sleeve 15, and concrete 4 being poured between the prefabricated bridge pier 3 and the cylinder 2.

[0037] In the present application, the prefabricated and assembled bridge pier is formed by covering the cylinder 2 on the prefabricated bridge pier 3 that can be assembled, and the cylinder 2 itself is directly fixedly connected to the first main reinforcement 11 in the base foundation 1 and the cylinder 2 is partially cast in the base foundation 1. The cylinder 2 replaces the steel bars that need to be added to supplement the strength of the prefabricated bridge pier 3. The first main reinforcement 11 passes through the through hole of the cylinder 2 and the cylinder 2 is partially cast in the base foundation 1, thereby achieving reinforcement, thereby changing the stiffness and seismic performance of the prefabricated and assembled bridge pier, so that it can be used in high seismic intensity areas (8 degrees and above).

[0038] In order to better understand the prefabricated assembled bridge piers in this application, they will be further explained and illustrated below. Figure 1 As shown, the prefabricated, assembled bridge pier can include: a cap foundation 1, a cylinder 2, and a prefabricated pier 3. The cap foundation 1 can be cast using concrete, with various types of steel bars tied into it based on the loads the cap needs to withstand. At the location where the prefabricated pier 3 is to be installed on the cap foundation 1, a first main bar 11 extending horizontally and a second main bar 12 extending vertically are installed within the cap foundation 1. The first and second main bars 11, 12 can be connected or tied together with other main bars or steel bars as needed.

[0039] like Figure 1 As shown, after the foundation 1 is cast, the foundation 1 has an upper end surface. The first main reinforcement 11 can be passed through the symmetrical through-holes on the cylinder 2. There are multiple first main reinforcements 11, which are located at the upper end position inside the foundation 1, that is, a certain distance away from the upper end surface of the foundation 1. The multiple first main reinforcements 11 can be extended in the same direction or in different directions in the horizontal direction. In this way, the fixing effect of the first main reinforcement 11 on the cylinder 2 and the prefabricated bridge pier 3 in different directions can be further improved. In the projection in the direction of gravity, the first main reinforcement 11 that partially passes through the symmetrical through-holes can intersect with the first main reinforcement 11 that partially passes through the symmetrical through-holes. Furthermore, the first main reinforcement 11 that partially passes through the symmetrical through-holes can be perpendicular to the first main reinforcement 11 that partially passes through the symmetrical through-holes. In this way, the fixing effect of the cylinder 2 and the prefabricated bridge pier 3 can be further improved. As a feasible approach, in the vertical direction, the first main reinforcement 11 can be in multiple rows, and the multiple rows of first main reinforcement 11 can be arranged in sequence. Each row of first main reinforcement 11 is at a different depth position of the pedestal foundation 1, and they are sequentially passed through the symmetrical through holes on the cylinder 2. In this way, the fixing effect of the cylinder 2 and the prefabricated pier 3 can be further improved.

[0040] like Figure 1 As shown, multiple second main bars 12 can be evenly distributed within the area within the cap foundation 1 where the precast piers 3 are located. The second main bars 12 are located at the upper end of the cap foundation. A grouting sleeve 15 is connected to the upper end of the second main bar 12, with the upper end of the grouting sleeve 15 generally flush with the upper end surface of the cap foundation 1. The upper end of the grouting sleeve 15 is used to connect to the third main bar 31 of the precast pier 3. Alternatively, the grouting sleeve 15 can be pre-buried within the cap foundation 1 for later connection to the third main bar 31 of the precast pier 3.

[0041] like Figure 1 As shown, the cylinder 2 extends in the vertical direction and needs to be made of a high-strength material. Alternatively, the cylinder 2 can be made of steel, with the sidewall thickness of the cylinder 2 being greater than or equal to 12 mm to meet the strength requirements. Furthermore, the steel can be Q345 steel, which has excellent comprehensive mechanical properties, good low-temperature performance, and good plasticity and weldability.

[0042] like Figure 1As shown, the lower end of the cylinder 2 has symmetrical through holes, and the symmetrical through holes are located in the same horizontal plane. As a feasible method, there can be multiple symmetrical through holes, which can be distributed along the circumferential direction of the cylinder 2. In other feasible embodiments, the symmetrical through holes can also be arranged and distributed along the vertical direction of the cylinder 2. All the through holes extend below the upper end surface of the pedestal foundation 1. Before the pedestal foundation 1 is cast, the first main reinforcement 11 passes through the symmetrical through holes. After the pedestal foundation 1 is cast, the through holes and the first main reinforcement 11 are all located inside the pedestal foundation 1. In this way, the firmness of the fixation between the cylinder 2 and the pedestal foundation 1 can be improved to improve the seismic performance. In order to ensure sufficient firmness of fixation between the cylinder 2 and the pedestal foundation 1, further, the depth of the lower end of the cylinder 2 extending into the upper end surface of the pedestal foundation 1 is at least 30 cm.

[0043] like Figure 1 As shown, the lower end surface of the cylinder 2 has an extension 21 extending away from the axis of the cylinder 2. This extension 21 can be located at the lowest end of the cylinder 2, below the through-hole. The presence of the extension 21 can improve the ability of the precast pier 3 to withstand horizontal forces, making the cylinder 2 and the precast pier 3 more stable and further enhancing seismic performance.

[0044] like Figure 1 As shown, the precast pier 3 is installed in the cylindrical body 2. The precast pier 3 has a third main reinforcement 31 extending vertically. The lower end of the third main reinforcement 31 is connected to the second main reinforcement 12 via a grouting sleeve 15. Cement grout is injected into the grouting sleeve 15 to securely connect the third main reinforcement 31, the second main reinforcement 12, and the grouting sleeve 15 together to form a single unit. Alternatively, to facilitate installation of the precast pier 3, the third main reinforcement 31 of the precast pier 3 extends beyond the lower end surface of the precast pier 3 to be inserted into the grouting sleeve 15 within the cap foundation 1. Furthermore, the length of the third main reinforcement 31 extending beyond the lower end surface of the precast pier 3 is at least 32 cm. This allows the precast pier 3 to be hoisted into the cylindrical body 2, requiring only the third main reinforcement 31 extending from the lower end surface of the precast pier 3 to be aligned downwardly with the corresponding grouting sleeve 15 within the cap foundation 1. This facilitates observation and alignment of the third main reinforcement 31 with the grouting sleeve 15. To ensure the connection strength between the third main reinforcement 31 and the second main reinforcement 12, HRB400 steel bars with a diameter of 28 mm or greater can be used for the third main reinforcement 31 and the second main reinforcement 12. Of course, the precast pier 3 is cast in concrete, and shear reinforcement can be embedded in the precast pier 3. Shear keys 22 can also be provided within the cylinder 2. The combination of shear reinforcement and shear keys 22 ensures that the precast pier 3 and the cylinder 2 are integrally supported. Various other types of reinforcement can also be used depending on the loads the precast pier 3 must withstand, but these will not be discussed in detail here.

[0045] In order to inject cement slurry into the grouting sleeve 15 so that the third main reinforcement 31, the second main reinforcement 12 and the grouting sleeve 15 are fixedly connected together to form a whole, the foundation 1 is provided with an injection channel 13 and an outflow channel 14 connected to the grouting sleeve 15. The injection channel 13 and the outflow channel 14 can be formed by a hose, and multiple grouting sleeves 15 are connected by multiple hoses, thereby forming an injection channel 13 and an outflow channel 14 connected to each grouting sleeve 15. When the grouting sleeve 15 needs to be grouted, cement slurry is injected into the injection channel 13 by high-pressure grouting. After the cement slurry flows out of the outflow channel 14, the outflow channel 14 is closed and the cement slurry injection is stopped. Generally speaking, the injection channel 13 is connected to the lower end of the grouting sleeve 15, and the outflow channel 14 is connected to the upper end of the grouting sleeve 15, so as to discharge the air in the grouting sleeve 15 during grouting, avoiding the existence of gas gaps in the grouting sleeve 15, which affects the connection firmness of the grouting sleeve 15.

[0046] like Figure 1 As shown, concrete 4 is poured between the precast pier 3 and the cylinder 2, further integrating the cylinder 2 and the precast pier 3 into a single, integrated whole, allowing them to share common loads. Furthermore, C50 self-leveling, non-shrinkage concrete can be poured into the gap between the precast pier 3 and the cylinder 2. This offsets the shrinkage and deformation of the concrete during later solidification and hardening, preventing the formation of a gap between the cylinder 2 and the concrete 4 and ensuring that the cylinder 2 and the precast pier 3 are as tightly integrated as possible.

[0047] As a feasible option, the lower end surface of the precast pier 3 can be roughened. Similarly, the upper end surface of the foundation cap 1 corresponding to the lower end surface of the precast pier 3 can also be roughened. Before the precast pier 3 is installed, a grouting process can be performed between the lower end surface of the precast pier 3 and the upper end surface of the foundation cap 1. This allows for a later connection between the two using cement grout to further enhance the firmness and improve seismic performance.

[0048] This application also proposes a construction method for a prefabricated and assembled bridge pier, which may include the following steps:

[0049] During the process of tying the steel bars of the pedestal foundation 1, the cylinder 2 is set at the pedestal foundation 1, the first main reinforcement 11 extending in the horizontal direction in the pedestal foundation 1 is passed through the symmetrical through holes at the lower end of the cylinder 2, and the upper end of the second main reinforcement 12 extending in the vertical direction in the pedestal foundation 1 is installed with a grouting sleeve 15.

[0050] In the above steps, the cylinder 2 extends in the vertical direction. The cylinder 2 can be prefabricated in the factory. The through holes on the cylinder 2 are opened and processed in advance in the factory according to needs. The processed cylinder 2 is then transported to the base 1 to be built. The lower end of the cylinder 2 is set at the base 1 where the prefabricated pier 3 needs to be installed. When tying the steel bars, the first main reinforcement 11 extending in the horizontal direction in the base 1 is passed through the symmetrical through holes at the lower end of the cylinder 2. The upper end of the second main reinforcement 12 extending in the vertical direction in the base 1 is inserted into the grouting sleeve 15. The upper end position of the grouting sleeve 15 is basically flush with the upper end surface of the base 1 after the casting is completed. The position of each grouting sleeve 15 needs to correspond to the position of the third main reinforcement 31 of the prefabricated pier 3. The other steel bars on the base 1 are tied, and the cylinder 2 is installed and positioned. At the same time, a plurality of hoses may be arranged, and the plurality of hoses are respectively connected to the plurality of grouting sleeves 15 , so as to form injection channels 13 and outflow channels 14 communicating with the respective grouting sleeves 15 later.

[0051] After the reinforcement of the cap foundation 1 is tied, the cap foundation 1 is poured so that the upper end surface of the cap foundation 1 after pouring is higher than the through hole, and an injection channel 13 and an outflow channel 14 connected to the grouting sleeve 15 are formed in the cap foundation 1.

[0052] During the above steps, one end of the hose must be exposed above the upper surface of the cap foundation 1 to facilitate the subsequent injection and removal of cement slurry through the hose. All grouting sleeves 15 are cast within the cap foundation 1, with the opening at the uppermost end of each sleeve exposed to facilitate the subsequent insertion of the third main reinforcement 31 of the precast pier 3.

[0053] The prefabricated pier 3 is hoisted into the cylinder 2 , and the third main reinforcement 31 extending from the lower end of the prefabricated pier 3 is inserted into the grouting sleeve 15 in the cap foundation 1 .

[0054] In the above steps, the prefabricated piers are installed after the strength of the concrete poured in the pedestal foundation 1 reaches 100%. The prefabricated piers are prefabricated in the factory in advance and then transported to the construction site. When the prefabricated piers need to be installed, they are installed in the cylinder 2 by hoisting. During the installation in the cylinder 2, the third main reinforcement 31 extending from the lower end of the prefabricated pier 3 is aligned with the grouting sleeve 15 in the pedestal foundation 1, and then inserted one by one into the grouting sleeve 15 in the pedestal foundation 1. As a feasible method, before the prefabricated pier is installed in the cylinder 2, the lower end face of the prefabricated pier and the corresponding upper end face of the pedestal foundation 1 can be roughened in advance. During the installation in the cylinder 2, the two end faces are mortared to improve the firmness of the subsequent connection.

[0055] Cement slurry is injected into the grouting sleeve 15 through the injection channel 13 until the cement slurry flows out from the outflow channel 14 .

[0056] In the above steps, after the prefabricated pier is installed, cement slurry is injected into the grouting sleeve 15 through the injection channel 13 formed by the hose until the cement slurry flows out through the outflow channel 14 formed by the other hose. After the cement slurry flows out of the outflow channel 14, the outflow channel 14 and the injection channel 13 can be closed, and the cement slurry injection is stopped.

[0057] After the grouting sleeve 15 is injected with cement slurry, concrete 4 is poured into the gap between the cylinder body 2 and the prefabricated bridge pier 3 to form the cylinder body 2 and the prefabricated bridge pier 3 into a whole.

[0058] The prefabricated and assembled bridge piers and their construction methods in the embodiments of the present application have the following beneficial effects: First, the cylinder 2 replaces the additional reinforcement required for the prefabricated pier 3. The combined effect of the first main reinforcement 11 passing through the through-holes of the cylinder 2 and the partial casting of the cylinder 2 into the cap foundation 1 achieves a reinforcement effect, thereby improving the stiffness and seismic performance of the prefabricated and assembled bridge pier. Second, both the cylinder 2 and the prefabricated bridge pier 3 are prefabricated in a factory or prefabrication plant, achieving high construction precision and further improving component quality. Third, the construction process of the prefabricated and assembled bridge pier has minimal impact on traffic, significantly reducing the area of ​​enclosure and occupying less space on existing roads. The cylinder 2 and prefabricated bridge pier 3 can be transported and hoisted at night, leaving traffic open during the day, minimizing the significant traffic pressure caused by bridge construction. Fourth, the present application can minimize the proportion of workers required for on-site construction, thereby improving construction site safety. Fifth, this application can significantly shorten the construction period of prefabricated and assembled bridge piers. Prefabricated bridge piers 3 can be directly hoisted within the enclosure, eliminating the need for scaffolding and formwork casting required for pier construction, thereby effectively shortening the construction period. Sixth, this application is environmentally friendly and sustainable. By significantly reducing the workload of on-site pouring, it effectively reduces the noise, dust, and sewage emissions caused by concrete pouring and curing, reducing the impact on the urban environment, embodying the concept of green and civilized construction, and achieving significant social benefits.

[0059] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "essentially consisting of..." describing a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps herein also contemplates an embodiment that is essentially composed of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any attribute described that "may" include is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0060] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated assembled bridge pier, characterized in that: The prefabricated assembled bridge pier comprises: A cap foundation, wherein a first main reinforcement extending in a horizontal direction and a second main reinforcement extending in a vertical direction are provided in the cap foundation; a cylindrical body, wherein the lower end of the cylindrical body has symmetrical through holes, the through holes extending below the upper end surface of the cap foundation, and the first main reinforcement is passed through the symmetrical through holes; A prefabricated bridge pier is disposed in the cylindrical body, the prefabricated bridge pier having a third main reinforcement extending in a vertical direction, the third main reinforcement being connected to the second main reinforcement via a grouting sleeve, and concrete being poured between the prefabricated bridge pier and the cylindrical body; There are multiple symmetrical through holes; there are multiple first main bars, and the first main bars that partially pass through the symmetrical through holes are in a vertical state with the first main bars that partially pass through the symmetrical through holes; the grouting sleeve is pre-buried in the base foundation; the third main bar of the prefabricated pier extends out of the lower end surface of the prefabricated pier to be inserted into the grouting sleeve in the base foundation; the lower end surface of the cylinder has an extension portion extending away from the axis of the cylinder.

2. The prefabricated and assembled bridge pier according to claim 1, characterized in that: The cylinder is made of steel, and the thickness of the side wall of the cylinder is greater than or equal to 12 mm.

3. The prefabricated and assembled bridge pier according to claim 1, characterized in that: The cross-sectional shape of the cylinder corresponds to the cross-sectional shape of the prefabricated bridge pier.

4. The prefabricated and assembled bridge pier according to claim 1, characterized in that: The depth of the lower end of the cylinder extending into the upper end surface of the base foundation is at least 30 cm.

5. The prefabricated and assembled bridge pier according to claim 1, characterized in that: The length of the third main reinforcement of the prefabricated bridge pier extending from the lower end surface of the prefabricated bridge pier is at least 32 cm.

6. The prefabricated and assembled bridge pier according to claim 1, characterized in that: The cap foundation is provided with an injection channel and an outflow channel which are communicated with the grouting sleeve.

7. A construction method for a prefabricated and assembled bridge pier according to any one of claims 1 to 6, characterized in that: The construction method of the prefabricated assembled bridge pier comprises the following steps: During the process of tying the steel bars of the cap foundation, the cylinder is set at the cap foundation, the first main reinforcement extending in the horizontal direction of the cap foundation is passed through the symmetrical through-holes at the lower end of the cylinder, and the upper end of the second main reinforcement extending in the vertical direction of the cap foundation is installed with a grouting sleeve; After the reinforcement of the cap foundation is tied, the cap foundation is poured so that the upper end surface of the cap foundation after pouring is higher than the through hole, and an injection channel and an outflow channel connected to the grouting sleeve are formed in the cap foundation; Hoisting the prefabricated bridge pier into the cylinder, and inserting the third main reinforcement extending from the lower end of the prefabricated bridge pier into the grouting sleeve in the cap foundation; injecting cement slurry into the grouting sleeve through the injection channel until the cement slurry flows out of the outflow channel; After the grouting sleeve is injected with cement slurry, concrete is poured into the gap between the cylinder and the prefabricated bridge pier to form the cylinder and the prefabricated bridge pier into a whole.

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