Prefabricated segmental hollow steel pipe-reinforced concrete composite pier

Abstract

The application discloses a prefabricated segment assembled steel-concrete composite pier, which comprises at least one stand column, and the stand column comprises a prefabricated bottom pier segment, a prefabricated middle pier segment, a prefabricated top pier segment and an assembling joint; the upper end of the prefabricated bottom pier segment is connected with the lower end of the prefabricated middle pier segment through the assembling joint, and the upper end of the prefabricated middle pier segment is connected with the lower end of the prefabricated top pier segment; the prefabricated segment comprises a hollow steel pipe and a reinforced concrete layer, and the reinforced concrete layer is coaxially poured on the outside of the hollow steel pipe; the steel-concrete composite structure is adopted, the advantages of the performances of the steel and the concrete are combined, the construction mode of factory segment prefabrication and on-site assembly is adopted, the hollow steel pipe not only participates in structure stress but also serves as an inner formwork for pouring the concrete, the segment prefabrication is facilitated, and the formwork consumption is saved; compared with the conventional reinforced concrete pier, the structure is light in weight, is convenient for assembly construction and is favorable for resisting earthquakes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to a prefabricated segmental hollow steel pipe-reinforced concrete composite bridge pier. BACKGROUND

[0002] In recent years, prefabricated segmental reinforced concrete bridge piers have developed rapidly in China, but the prefabricated segmental reinforced concrete bridge piers have large weight, high requirements for transportation roads and hoisting equipment, especially when the height of the bridge pier is large, the transportation and installation are difficult, and the prefabricated segmental assembly joints commonly used at present, such as grouting sleeves or prestress + glue joints, are limited in use in high-intensity earthquake areas due to poor ductility. SUMMARY

[0003] The present application solves the technical problems of the existing prefabricated segmental reinforced concrete bridge pier, which has large weight, high difficulty in assembly, and poor seismic performance, and provides a prefabricated segmental steel-concrete composite bridge pier which is light, convenient to prefabricate and transport and assemble, has good seismic performance, is green and environmentally friendly, and is economically reasonable, and specifically, a prefabricated segmental hollow steel pipe-reinforced concrete composite bridge pier.

[0004] The present application is realized by the following technical scheme:

[0005] A prefabricated segmental hollow steel pipe-reinforced concrete composite bridge pier, the bridge pier comprising at least one column, the column comprising: a prefabricated bottom segment, a prefabricated middle segment, a prefabricated top segment and an assembly joint, the number of prefabricated middle segments being 0-n;

[0006] The lower end of the prefabricated bottom segment is connected with a foundation or a pile cap, and the upper end of the prefabricated top segment is connected with a bent cap supporting an upper structure of a bridge or directly connected with the upper structure of the bridge;

[0007] If the number of prefabricated middle segments is 0, the upper end of the prefabricated bottom segment is connected with the lower end of the prefabricated top segment through the assembly joint;

[0008] If the number of prefabricated middle segments is 1, the upper end of the prefabricated bottom segment is connected with the lower end of the prefabricated middle segment through the assembly joint, and the upper end of the prefabricated middle segment is connected with the lower end of the prefabricated top segment;

[0009] If the number of prefabricated middle segments is greater than 1, a plurality of prefabricated middle segments are connected in series through the assembly joint, the lowermost prefabricated middle segment is connected with the prefabricated bottom segment, and the uppermost prefabricated middle segment is connected with the prefabricated top segment.

[0010] Optionally, a height threshold for the bridge pier is set. If the number of columns of the bridge pier is greater than 1 and the height of the bridge pier is greater than the height threshold, then a horizontally arranged transverse beam is connected between two adjacent columns. The two ends of the transverse beam are respectively fixedly connected to the middle segment of the precast pier of the two adjacent columns.

[0011] Specifically, the precast pier bottom segment, the precast pier middle segment, and the precast pier top segment include:

[0012] Hollow steel pipe;

[0013] A reinforced concrete layer is coaxially cast on the outside of the hollow steel pipe, and the inner side of the reinforced concrete layer is in contact with the outer side of the hollow steel pipe.

[0014] A reinforcing cage is disposed inside the reinforced concrete layer and is fixedly connected to the outer side of the hollow steel pipe.

[0015] Specifically, the steel cage includes:

[0016] Vertical main reinforcement bars are arranged vertically and distributed in a ring along the central axis of the hollow steel pipe.

[0017] Circular stirrups, multiple circular stirrups are coaxially arranged with the hollow steel pipe and vertically distributed along the central axis of the hollow steel pipe; the vertical main bars and the circular stirrups are tied together.

[0018] Tie rods, one end of multiple tie rods is tied to the vertical main reinforcement, and the other end of multiple tie rods is welded to the outer side of the hollow steel pipe.

[0019] Specifically, the assembly joint includes:

[0020] A ring-shaped steel plate is welded to the upper end of the hollow steel pipe of the bottom segment / middle segment of the precast pier. The ring-shaped steel plate is horizontally arranged, and the inner diameter of the ring-shaped steel plate is smaller than the inner diameter of the hollow steel pipe, while the outer diameter of the ring-shaped steel plate is larger than the outer diameter of the hollow steel pipe.

[0021] The lower stiffening assembly is welded to the upper end of the hollow steel pipe of the bottom segment / middle segment of the precast pier, and the lower stiffening assembly is welded to the lower side of the annular steel plate.

[0022] The upper stiffening assembly is welded to the lower end of the hollow steel pipe in the middle segment / top segment of the precast pier;

[0023] When connecting the precast pier bottom segment and / or the precast pier middle segment and / or the precast pier top segment through the assembly joint, the upper stiffening assembly is welded to the upper side of the annular steel plate.

[0024] Specifically, the lower stiffening component includes:

[0025] Multiple lower external stiffening steel plates are arranged in a ring on the outer side of the hollow steel pipe, and the upper end and side of the lower external stiffening steel plates are respectively welded to the lower side of the ring steel plate and the outer side of the hollow steel pipe.

[0026] Multiple lower internal stiffening steel plates are arranged in a ring on the inner side of the hollow steel pipe, and the upper end and side of the lower internal stiffening steel plates are respectively welded to the lower side of the ring steel plate and the inner side of the hollow steel pipe.

[0027] The upper stiffening component includes:

[0028] Multiple upper external stiffening steel plates are arranged in a ring on the outer side of the hollow steel pipe, and the sides of the upper external stiffening steel plates are welded to the outer side of the hollow steel pipe.

[0029] Multiple upper internal stiffening steel plates are arranged in a ring on the inner side of the hollow steel pipe, and the sides of the upper internal stiffening steel plates are welded to the inner side of the hollow steel pipe.

[0030] The lower ends of the upper outer stiffening steel plate, the upper inner stiffening steel plate, and the hollow steel pipe are located on the same horizontal plane.

[0031] Furthermore, the assembly joint also includes shear connectors, and the plurality of shear connectors are respectively fixedly connected to the plurality of upper outer stiffening steel plates and the plurality of lower outer stiffening steel plates;

[0032] The multiple upper external stiffening steel plates, the multiple lower external stiffening steel plates, and the multiple shear connectors are all located within the reinforced concrete layer.

[0033] Furthermore, the assembly joint also includes a reinforcing bar joint;

[0034] The steel bar joint is used to connect the vertical main reinforcement bars between the bottom segment of the precast pier and the middle segment of the precast pier;

[0035] The vertical main reinforcement used to connect the precast pier bottom segment and the precast pier top segment;

[0036] The vertical main reinforcement used to connect the middle segments of two adjacent precast piers;

[0037] The vertical main reinforcement used to connect the middle segment of the precast pier and the top segment of the precast pier.

[0038] Specifically, the reinforced concrete layer is a precast structure, and concrete wet joints are provided at the lower end of the precast pier bottom segment, at both ends of the precast pier middle segment, and at the lower end of the precast pier top segment. No concrete is poured in the concrete wet joints, and the annular steel plate is located inside the concrete wet joints.

[0039] Specifically, the annular steel plate is provided with multiple holes, which are located on the outside of the hollow steel pipe.

[0040] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0041] The steel-concrete composite structure adopted in this invention effectively solves the yielding problem of steel plates, fully utilizes the high strength and high toughness of steel, and achieves a combination of the advantages of the properties of steel and concrete.

[0042] The construction mode of prefabrication in the factory and assembly on site is highly mechanized, with good product quality and fast construction progress. The hollow steel pipes not only participate in the structural stress but also serve as the internal formwork for pouring concrete, which not only facilitates segmental prefabrication but also saves on formwork usage. Compared with conventional reinforced concrete bridge piers, the structure is lighter, which not only facilitates prefabrication construction but also helps with earthquake resistance.

[0043] Different precast segments are connected by assembly joints, which simplifies the erection, positioning, adjustment, and correction of precast segments during assembly and makes installation convenient. In addition, the use of steel structures to reinforce the joints provides good strength and toughness, effectively solving the problem of poor seismic performance of traditional reinforced concrete joints and giving the bridge pier as a whole good seismic performance. Attached Figure Description

[0044] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, but do not constitute a limitation on the embodiments of the present invention.

[0045] Figure 1 This is a structural schematic diagram of a prefabricated segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to the present invention.

[0046] Figure 2 This is a schematic diagram of the connection of the transverse beam according to the present invention.

[0047] Figure 3 This is a cross-sectional view of a prefabricated segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to the present invention.

[0048] Figure 4 yes Figure 3 AA sectional view.

[0049] Figure 5 This is a structural schematic diagram of the steel cage according to the present invention.

[0050] Figure 6 This is a schematic diagram of another structure of a prefabricated segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to the present invention.

[0051] Figure 7 This is one of the assembly flow diagrams for a prefabricated segmental hollow steel pipe-reinforced concrete composite bridge pier according to the present invention.

[0052] Figure 8 This is one of the assembly flow diagrams for a prefabricated segmental hollow steel pipe-reinforced concrete composite bridge pier according to the present invention.

[0053] Figure 9 This is one of the assembly flow diagrams for a prefabricated segmental hollow steel pipe-reinforced concrete composite bridge pier according to the present invention.

[0054] Reference numerals: 1-Precast pier bottom segment, 2-Precast pier middle segment, 3-Precast pier top segment, 4-Assembly joint, 5-Horizontal tie beam, 6-Hollow steel pipe, 7-Reinforced concrete layer, 8-Vertical main reinforcement, 9-Circular stirrup, 10-Tie bar, 11-Reinforcement joint, 12-Circular steel plate, 13-Hole, 14-Lower outer stiffening steel plate, 15-Lower inner stiffening steel plate, 16-Upper outer stiffening steel plate, 17-Upper inner stiffening steel plate, 18-Shear connector, 19-Concrete wet joint. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0056] It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "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 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 application according to the specific circumstances.

[0058] In this application, unless otherwise expressly 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 being 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 being 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.

[0059] Where there is no conflict, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0060] Example 1

[0061] A typical bridge pier consists of at least one column, meaning it can be composed of one, two, or more columns, forming single-column, double-column, and multi-column bridge piers. Figure 1 and Figure 2 It is a double-column pier.

[0062] In practice, each column is vertically divided into several steel-concrete composite segments. These segments are prefabricated in the factory and then transported to the site for assembly from bottom to top. Therefore, the column is defined as consisting of: a prefabricated bottom segment 1, a prefabricated middle segment 2, and a prefabricated top segment 3. The prefabricated segments are assembled using assembly joints 4. The number of prefabricated middle segments 2 is flexibly set according to the height of the pier, ranging from 0 to n.

[0063] When transported to the bridge site for installation, the lower end of the precast pier bottom segment 1 is connected to the foundation or abutment, and the upper end of the precast pier top segment 3 is connected to the cap beam supporting the bridge superstructure or directly to the bridge superstructure; a suitable number of precast pier intermediate segments 2 are connected between the precast pier bottom segment 1 and the precast pier top segment 3.

[0064] If the number of intermediate segments 2 of the precast pier is 0, the upper end of the bottom segment 1 of the precast pier is connected to the lower end of the top segment 3 of the precast pier through the assembly joint 4.

[0065] If the number of precast pier intermediate segments 2 is 1, the upper end of the precast pier bottom segment 1 is connected to the lower end of the precast pier intermediate segment 2 through the assembly joint 4, and the upper end of the precast pier intermediate segment 2 is connected to the lower end of the precast pier top segment 3.

[0066] If the number of precast pier intermediate segments is greater than 1, multiple precast pier intermediate segments 2 are connected in series through assembly joints 4, and the precast pier intermediate segment 2 at the bottom is connected to the precast pier bottom segment 1, and the precast pier intermediate segment 2 at the top is connected to the precast pier top segment 3.

[0067] If the number of columns of the pier is greater than 1 and the height of the pier is greater than the set height threshold, in order to increase the stability between the columns, a horizontally arranged transverse beam 5 is connected between two adjacent columns. The two ends of the transverse beam 5 are fixedly connected to the middle segment 2 of the precast pier of the two adjacent columns, respectively.

[0068] like Figure 3 and Figure 4 As shown, the precast pier bottom segment 1, the precast pier middle segment 2, and the precast pier top segment 3 have similar overall structures, including: hollow steel pipe 6, reinforced concrete layer 7, and steel cage.

[0069] Hollow steel pipe 6, made of finished steel pipe or welded from steel plate, can have a circular, rectangular or other polygonal cross-section; that is, as shown in the figure. Figure 4 and Figure 6 The two different cross sections are shown.

[0070] The reinforced concrete layer 7 is coaxially cast on the outside of the hollow steel pipe 6, and the inner surface of the reinforced concrete layer 7 is in contact with the outer surface of the hollow steel pipe 6; the reinforcing cage is placed inside the reinforced concrete layer 7 and is fixedly connected to the outer surface of the hollow steel pipe 6. During prefabrication, the reinforcing cage is first connected to the outer surface of the hollow steel pipe 6, and then the reinforced concrete layer 7 is poured. After curing the reinforced concrete layer 7, the prefabrication is completed.

[0071] like Figure 5 As shown, the steel cage in this embodiment includes vertical main bars 8, ring stirrups 9, and tie bars 10.

[0072] Multiple vertical main reinforcement bars 8 are vertically arranged and distributed in a ring along the central axis of the hollow steel pipe 6; multiple ring stirrups 9 are coaxially arranged with the hollow steel pipe 6 and vertically distributed along the central axis of the hollow steel pipe 6; the vertical main reinforcement bars 8 and the ring stirrups 9 are tied together; one end of multiple tie bars 10 is tied to the vertical main reinforcement bars 8, and the other end of multiple tie bars 10 is welded to the outer surface of the hollow steel pipe 6.

[0073] The steel cage consists of vertical main bars 8 distributed at certain intervals along the circumference and ring stirrups 9 distributed at certain intervals along the vertical direction and tied around the vertical main bars 8. Tie bars 10 are arranged at certain intervals along the circumference and vertical direction, and adopt a V-shaped double-limb form or a hook-shaped single-limb form. One end is tied to the vertical main bars 8, and the other end is welded to the outer surface of the hollow steel pipe 6.

[0074] Example 2

[0075] This embodiment describes the structure of the assembly joint 4, such as... Figure 3 and Figure 4 As shown, the assembly joint 4 includes an annular steel plate 12, a lower stiffening assembly, and an upper stiffening assembly.

[0076] The annular steel plate 12 is welded to the upper end of the hollow steel pipe 6 of the precast pier bottom segment 1 / precast pier middle segment 2. The annular steel plate 12 is set horizontally, and the inner diameter of the annular steel plate 12 is smaller than the inner diameter of the hollow steel pipe 6, while the outer diameter of the annular steel plate 12 is larger than the outer diameter of the hollow steel pipe 6.

[0077] The lower stiffening assembly is welded to the upper end of the hollow steel pipe 6 of the precast pier bottom segment 1 / precast pier middle segment 2, and the lower stiffening assembly is welded to the lower side of the annular steel plate 12; the lower stiffening assembly makes the connection between the annular steel plate 12 and the hollow steel pipe 6 more stable.

[0078] The upper stiffening assembly is welded to the lower end of the hollow steel pipe 6 of the middle segment 2 of the precast pier / top segment 3 of the precast pier; the upper stiffening assembly enables the upper precast segment to be stably connected to the lower annular steel plate 12 when different precast segments need to be connected.

[0079] When connecting the precast pier bottom segment 1 and / or the precast pier middle segment 2 and / or the precast pier top segment 3 through the assembly joint 4, the upper stiffening assembly is welded to the upper side of the annular steel plate 12.

[0080] That is, the annular steel plate 12 at the upper end of the precast pier bottom segment 1 is welded to the lower stiffening assembly at the lower end of the precast pier middle segment 2, and the annular steel plate 12 at the upper end of the precast pier middle segment is welded to the lower stiffening assembly at the lower end of the precast pier top segment 3.

[0081] The specific structures of the upper stiffening assembly and the lower stiffening assembly are described below.

[0082] The lower stiffening assembly includes a lower outer stiffening steel plate 14 and a lower inner stiffening steel plate 15.

[0083] Multiple lower external stiffening steel plates 14 are arranged in a ring on the outer side of the hollow steel pipe 6, and the upper end and side of the lower external stiffening steel plates are respectively welded to the lower side of the ring steel plate 12 and the outer side of the hollow steel pipe 6; multiple lower internal stiffening steel plates 15 are arranged in a ring on the inner side of the hollow steel pipe 6, and the upper end and side of the lower internal stiffening steel plates are respectively welded to the lower side of the ring steel plate 12 and the inner side of the hollow steel pipe 6.

[0084] The upper stiffening assembly includes an upper outer stiffening steel plate 16 and an upper inner stiffening steel plate 17.

[0085] Multiple upper external stiffening steel plates 16 are arranged in a ring on the outer side of the hollow steel pipe 6, and the sides of the upper external stiffening steel plates are welded to the outer side of the hollow steel pipe 6.

[0086] Multiple upper internal stiffening steel plates 17 are arranged in a ring on the inner side of the hollow steel pipe 6, and the sides of the upper internal stiffening steel plates are welded to the inner side of the hollow steel pipe 6.

[0087] The lower ends of the upper external stiffening steel plate 16, the upper internal stiffening steel plate 17, and the hollow steel pipe 6 are located on the same horizontal plane.

[0088] During segmental prefabrication, the upper end and side of the lower outer stiffening steel plate 14 are respectively welded to the lower side of the annular steel plate 12 and the outer side of the hollow steel pipe 6 of the lower prefabricated segment; the upper end and side of the lower inner stiffening steel plate 15 are respectively welded to the lower side of the annular steel plate 12 and the inner side of the hollow steel pipe 6 of the lower prefabricated segment; the side of the upper outer stiffening steel plate 16 is welded to the outer side of the hollow steel pipe 6 of the upper prefabricated segment; and the side of the upper inner stiffening steel plate 17 is welded to the inner side of the hollow steel pipe 6 of the upper prefabricated segment.

[0089] During on-site assembly of precast segments, the hollow steel pipe 6 of the upper precast segment is aligned with the hollow steel pipe 6 of the lower precast segment and welded to the upper side of the annular steel plate 12. The lower end of the upper outer stiffening steel plate 16 is aligned with the lower outer stiffening steel plate 14 and welded to the upper side of the annular steel plate 12. The lower end of the upper inner stiffening steel plate 17 is aligned with the lower inner stiffening steel plate 15 and welded to the upper side of the annular steel plate 12. At the same time, each vertical main reinforcement 8 of the upper precast segment is aligned with the corresponding vertical main reinforcement 8 of the lower precast segment and connected by a rebar joint 11.

[0090] The steel bar joint 11 is used to connect the vertical main reinforcement 8 between the bottom segment 1 of the precast pier and the middle segment 2 of the precast pier;

[0091] Vertical main reinforcement 8 is used to connect the precast pier bottom segment 1 and the precast pier top segment 3;

[0092] Vertical main reinforcement 8 is used to connect the middle segments 2 of two adjacent precast piers;

[0093] Vertical main reinforcement 8 is used to connect the middle segment 2 and the top segment 3 of the precast pier.

[0094] In addition, in order to strengthen the connection between the lower outer stiffening steel plate 14 and the upper outer stiffening steel plate 16 and the reinforced concrete layer 7, the assembly joint 4 is also provided with shear connectors 18, and multiple shear connectors 18 are fixedly connected to multiple upper outer stiffening steel plates 16 and multiple lower outer stiffening steel plates 14 respectively.

[0095] Multiple upper external stiffening steel plates 16, multiple lower external stiffening steel plates 14, and multiple shear connectors 18 are all located within the reinforced concrete layer 7.

[0096] In this embodiment, the reinforced concrete layer 7 is a precast structure. To facilitate the installation of different precast segments at the bridge construction site, concrete wet joints 19 are provided at the lower end of the precast pier bottom segment 1, both ends of the precast pier middle segment 2, and the lower end of the precast pier top segment 3. Vertical main reinforcement bars 8 are provided in the concrete wet joints 19, but the annular stirrups 9 and tie bars 10 do not need to be pre-installed. Additional annular stirrups 9 and tie bars 10 are tied during the later pouring of the concrete wet joint.

[0097] During prefabrication at the prefabrication plant, no concrete is poured into the concrete wet joint 19, and the annular steel plate 12 is located within the concrete wet joint 19.

[0098] During on-site installation, after welding the different precast segments together, concrete is poured into the wet joint 19. Multiple holes 13 are provided on the annular steel plate 12, located on the outside of the hollow steel pipe 6, allowing the wet joint concrete of the assembly joint 4 to flow through.

[0099] Example 3

[0100] Based on this pier concept, the design department, according to the bridge construction conditions, road grade and technical standards, proposed the bridge span layout and determined the form of the bridge superstructure. After structural analysis, the department proposed the pier cross-sectional layout and the main dimensions of each part. The design and verification were carried out in accordance with the current bridge design specifications of my country to meet the requirements of structural safety and functional use.

[0101] The precast segmental assembled hollow steel pipe 6 concrete composite bridge piers are constructed using a method of segmental prefabrication in the factory or beam yard and on-site assembly.

[0102] Segmental prefabrication: Prefabrication is carried out in a factory or beam fabrication yard. The main prefabrication process is as follows: Prepare equipment, platform, jig, support, and template for segmental prefabrication → Process and fabricate hollow steel pipes 6 for prefabricated segments → Process and fabricate steel plates for segmental assembly joints 4 and weld them onto the prefabricated segments according to the design position and requirements → Fabricate a reinforcing cage and connect it to the outer surface of the hollow steel pipe 6 → Use the hollow steel pipe 6 as the inner template for pouring concrete, and install the bottom template and outer template → Pour the reinforced concrete layer 7 of the prefabricated segments → Concrete curing → Steel structure factory painting → Complete segmental prefabrication → Move the prefabricated segments to the storage area or transport them to the bridge site for installation.

[0103] On-site erection and installation: Precast segments are transported to the site and assembled in a bottom-to-top sequence. First, install precast pier bottom segment 1. The bottom end of the pier bottom segment is connected to the foundation or abutment as designed → as shown. Figure 7 As shown, a guiding, limiting, and positioning device is installed on the upper part of the precast pier bottom segment 1 → a precast segment on the pier bottom is lifted and placed on the annular steel plate 12 at the upper end of the precast segment below it → as shown Figure 8As shown, position, align, correct, and fix. At assembly joint 4, weld the hollow steel pipe 6 of the upper segment and the upper stiffening assembly to the annular steel plate 12 at the top of the lower precast segment. → Install the annular stirrups 9 and tie bars 10 of assembly joint 4. Connect the vertical main bars 8 of the upper and lower precast segments one-to-one using rebar joints 11. → As shown Figure 9 As shown, erect the outer formwork of assembly joint 4 → pour wet joint concrete of assembly joint 4 → repeat the above process until the precast pier top segment 3 is installed → install the construction pier top cap beam or bridge superstructure.

[0104] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0105] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0106] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above invention, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A precast segmental assembled hollow steel pipe-reinforced concrete composite bridge pier, characterized in that, The pier includes at least one column, which includes: a precast pier bottom segment (1), a precast pier middle segment (2), a precast pier top segment (3), and an assembly joint (4). The number of the precast pier middle segments (2) is 0 to n. The lower end of the precast pier bottom segment (1) is connected to the foundation or pier cap, and the upper end of the precast pier top segment (3) is connected to the cap beam supporting the superstructure of the bridge or directly to the superstructure of the bridge. If the number of the intermediate segments (2) of the precast pier is 0, the upper end of the bottom segment (1) of the precast pier is connected to the lower end of the top segment (3) of the precast pier through the assembly joint (4); If the number of the precast pier middle segment (2) is 1, the upper end of the precast pier bottom segment (1) is connected to the lower end of the precast pier middle segment (2) through the assembly joint (4), and the upper end of the precast pier middle segment (2) is connected to the lower end of the precast pier top segment (3). If the number of the precast pier intermediate segments is greater than 1, the multiple precast pier intermediate segments (2) are connected in series through the assembly joint (4), and the precast pier intermediate segment (2) at the bottom end is connected to the precast pier bottom segment (1), and the precast pier intermediate segment (2) at the top end is connected to the precast pier top segment (3). The precast pier bottom segment (1), the precast pier middle segment (2), and the precast pier top segment (3) include: Hollow steel pipe (6); A reinforced concrete layer (7) is coaxially cast on the outside of the hollow steel pipe (6), and the inner side of the reinforced concrete layer (7) is in contact with the outer side of the hollow steel pipe (6). A reinforcing cage is installed inside the reinforced concrete layer (7) and is fixedly connected to the outer side of the hollow steel pipe (6); The assembly joint (4) includes: A ring-shaped steel plate (12) is welded to the upper end of the hollow steel pipe (6) of the precast pier bottom segment (1) / the precast pier middle segment (2). The ring-shaped steel plate (12) is horizontally arranged, and the inner diameter of the ring-shaped steel plate (12) is smaller than the inner diameter of the hollow steel pipe (6), and the outer diameter of the ring-shaped steel plate (12) is larger than the outer diameter of the hollow steel pipe (6). The lower stiffening assembly is welded to the upper end of the hollow steel pipe (6) of the precast pier bottom segment (1) / the precast pier middle segment (2), and the lower stiffening assembly is welded to the lower side of the annular steel plate (12). The upper stiffening assembly is welded to the lower end of the hollow steel pipe (6) of the middle segment (2) of the precast pier / the top segment (3) of the precast pier; When connecting the precast pier bottom segment (1) and / or the precast pier middle segment (2) and / or the precast pier top segment (3) through the assembly joint (4), the upper stiffening assembly is welded to the upper side of the annular steel plate (12); The lower stiffening component includes: Multiple lower external stiffening steel plates (14) are arranged in a ring on the outer side of the hollow steel pipe (6), and the upper end and side of the lower external stiffening steel plates (14) are respectively welded to the bottom surface of the ring steel plate (12) and the outer side of the hollow steel pipe (6). Multiple lower inner stiffening steel plates (15) are arranged in a ring on the inner side of the hollow steel pipe (6), and the upper end and side of the lower inner stiffening steel plates (15) are respectively welded to the bottom surface of the ring steel plate (12) and the inner side of the hollow steel pipe (6). The upper stiffening component includes: Multiple upper external stiffening steel plates (16) are arranged in a ring on the outer side of the hollow steel pipe (6), and the sides of the upper external stiffening steel plates (16) are welded to the outer side of the hollow steel pipe (6). Multiple upper internal stiffening steel plates (17) are arranged in a ring on the inner side of the hollow steel pipe (6), and the sides of the upper internal stiffening steel plates (17) are welded to the inner side of the hollow steel pipe (6). The lower ends of the upper outer stiffening steel plate (16), the upper inner stiffening steel plate (17), and the hollow steel pipe (6) are located on the same horizontal plane; The assembly joint (4) further includes shear connectors (18), and the plurality of shear connectors (18) are fixedly connected to the plurality of upper outer stiffening steel plates (16) and the plurality of lower outer stiffening steel plates (14) respectively. The multiple upper external stiffening steel plates (16), the multiple lower external stiffening steel plates (14), and the multiple shear connectors (18) are all located within the reinforced concrete layer (7).

2. The precast segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to claim 1, characterized in that, Set a height threshold for the pier. If the number of columns of the pier is greater than 1 and the height of the pier is greater than the height threshold, then a horizontally arranged transverse beam (5) is connected between two adjacent columns. The two ends of the transverse beam (5) are respectively fixedly connected to the middle segment (2) of the precast pier of the two adjacent columns.

3. The precast segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to claim 1, characterized in that, The steel cage includes: Vertical main reinforcement (8), multiple vertical main reinforcement (8) are set vertically and are distributed in a ring along the central axis of the hollow steel pipe (6); Circular stirrups (9), multiple circular stirrups (9) are coaxially arranged with the hollow steel pipe (6) and vertically distributed along the central axis of the hollow steel pipe (6); the vertical main reinforcement (8) and the circular stirrups (9) are tied together. Tie rods (10), one end of multiple tie rods (10) is tied to the vertical main bar (8), and the other end of multiple tie rods (10) is welded to the outer side of the hollow steel pipe (6).

4. The precast segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to claim 3, characterized in that, The assembly joint (4) also includes a steel bar joint (11). The steel bar joint (11) is used to connect the vertical main reinforcement (8) between the bottom segment (1) of the precast pier and the middle segment (2) of the precast pier. The vertical main reinforcement (8) is used to connect the precast pier bottom segment (1) and the precast pier top segment (3). The vertical main reinforcement (8) is used to connect the middle segments (2) of two adjacent precast piers. The vertical main reinforcement (8) is used to connect the middle segment (2) of the precast pier and the top segment (3) of the precast pier.

5. A precast segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to claim 1, characterized in that, The reinforced concrete layer (7) is a precast structure, and concrete wet joints (19) are provided at the lower end of the precast pier bottom segment (1), both ends of the precast pier middle segment (2) and the lower end of the precast pier top segment (3). During the precasting stage, no concrete is poured in the concrete wet joints (19), and the annular steel plate (12) is located in the concrete wet joints (19).

6. A precast segmental assembled hollow steel pipe-reinforced concrete composite bridge pier according to claim 5, characterized in that, The annular steel plate (12) is provided with a plurality of holes (13), which are located on the outside of the hollow steel pipe (6).

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