A prefabricated multi-column bridge pier

Abstract

The present invention discloses a prefabricated multi-column pier, which comprises at least one segment. Two adjacent segments are spliced and connected. Each segment comprises at least three columns. All the columns are arranged along the contour of the pier. A connecting plate is spliced and connected between two adjacent columns. Both the columns and the connecting plates are reinforced concrete members. The height of the connecting plate is adapted to the height of the columns. At least one prestressed steel strand is arranged in the columns. The prestressed steel strands are arranged along the whole length of the pier. By using this device, in addition to being divided into several segments vertically, each segment is also assembled into a hollow column body through columns and connecting plates, effectively reducing the material consumption, saving the cost, meeting the stiffness and strength requirements for normal operation, and being convenient for transportation, stacking and hoisting. It can effectively ensure the safety of the bridge structure and driving, and make up for the shortcomings of the traditional prefabricated piers, such as weak connection performance, and the cross-sectional dimensions, stiffness and quality being restricted by transportation conditions and installation construction conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and particularly relates to a prefabricated multi-column pier. Background Art

[0002] In recent years, in order to improve structural safety, economy and speed up construction, the use of precast segment erection technology in concrete piers has gradually increased. Compared with traditional cast-in-place piers, precast segment erection piers divide the pier into several segments in the vertical direction and are precast in a prefabrication yard in advance. After the precast segments reach a certain strength, they are transported from the prefabrication yard to the construction site and assembled on site by applying prestress and other methods. Currently, the development trend of this method is to adopt precast erection technology for both the lower structure and the upper structure.

[0003] However, the application of assembled piers is not yet widespread, mainly because of their disadvantages. Specifically as follows:

[0004] The research objects in existing literature are basically single-column piers. The cross-sectional size of the piers is small, and the provided stiffness is limited. For some piers with larger cross-sections, the connection technology between segments is more difficult, and it is difficult to ensure good working performance. At the same time, for single-column large cross-section assembled piers, the quality is often large, which will inevitably pose great challenges and risks to transportation and on-site installation. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above deficiencies of the single-column assembled pier in the prior art, such as being restricted by its own weight, transportation and on-site installation conditions, often having a small cross-section and small stiffness, and being unable to be applied to long-span bridge structures or railway bridge structures, etc., and to provide a prefabricated multi-column pier.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A prefabricated multi-column pier includes at least one segment. Two adjacent segments are spliced and connected. Each segment includes at least three columns. All the columns are arranged along the contour of the pier. A connecting plate is spliced and connected between two adjacent columns. Both the columns and the connecting plates are reinforced concrete members. The height of the connecting plate is adapted to the height of the columns. At least one prestressed steel strand is provided in the columns, and the prestressed steel strand is arranged along the entire length of the pier.

[0008] Adopting a prefabricated multi-column pier according to the present invention, in addition to being divided into several segments vertically, the columns of the segments are arranged along the contour of the pier, and the connecting plates between adjacent two columns are also arranged along the contour of the pier. That is, each segment is also assembled into a closed hollow pier body through at least three columns and the connecting plates between them. The contour of the formed pier body is determined according to the design. This structure can effectively reduce the material consumption and save the cost under the condition of equal sectional stiffness. Each component can be prefabricated and transported separately, effectively improving the processing quality and efficiency. It can enable the prefabricated pier to meet the stiffness and strength requirements for normal operation, and is convenient for transportation, on-site stacking and hoisting. The connection performance between segments is effectively guaranteed through the steel strands in the columns. The assembly is convenient and reliable, thus ensuring the safety of the bridge structure and vehicle driving, and effectively making up for the shortcomings of traditional prefabricated piers, such as weak connection performance, and the cross-sectional dimensions, stiffness and quality being restricted by transportation conditions and installation construction conditions.

[0009] Preferably, the segment further includes a diaphragm connection platform for arranging diaphragms.

[0010] More preferably, the diaphragm connection platform is connected to both ends of the segment.

[0011] Adopting the above setting method is used to strengthen the connection performance at the segment assembly.

[0012] Preferably, the column and the connecting plate are connected through a first boss and a first groove.

[0013] The first boss is arranged on the column, the first groove is arranged on the connecting plate, or vice versa. Through the matching connection of the first boss and the first groove, and then cooperating with grouting, the stable assembly of the column and the connecting plate can be completed.

[0014] Preferably, adjacent two segments are connected through a second boss and a second groove on the upper and lower end faces of the column and a third boss and a third groove on the upper and lower end faces of the connecting plate.

[0015] It is also through the matching connection of the boss and the groove, and then cooperating with grouting to realize the splicing between segments. After the splicing is completed, the prestressed steel strands are tensioned to ensure the connection strength of the columns.

[0016] Preferably, the cross-section of the column is a regular polygon, and the number of columns included in the segment is an even number.

[0017] More preferably, the number of sides of the column is an even number.

[0018] The cross-section of the column can be a square, a hexagon, an octagon, or a decagon.

[0019] Preferably, the cross-section of the column is square, hexagonal, octagonal or decagonal, and the number of columns included in the corresponding pier is four, six, eight or ten, that is, the number of sides of the column is the same as its quantity. Moreover, using columns with a polygonal cross-section is more convenient for stable connection with the connecting plate compared to columns with a circular cross-section.

[0020] Preferably, the segment at the bottommost is spliced and connected to the pile cap.

[0021] Preferably, the connecting plate can be replaced by a steel connecting piece, and the steel connecting piece includes a plurality of cross braces and a plurality of diagonal braces.

[0022] More preferably, both ends of the cross brace and both ends of the diagonal brace are bolted to the corresponding column.

[0023] In summary, compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. By using the assembled multi-column pier described in the present invention, in addition to being divided into several segments vertically, each segment is also assembled into a hollow column through columns and connecting plates. Under the condition of equal cross-section stiffness, the material consumption is effectively reduced, the cost is saved, and each component can be prefabricated, effectively improving the processing quality and processing efficiency. It can enable the assembled pier to meet the stiffness and strength requirements for normal operation, and at the same time, it is convenient for transportation, on-site stacking and hoisting. It can effectively ensure the connection performance between segments, and the assembly is convenient and reliable, thereby ensuring the safety of the bridge structure and the driving safety, effectively making up for the shortcomings of the traditional assembled pier with weak connection performance and the cross-section size, stiffness and quality being restricted by transportation conditions and installation construction conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of an assembled multi-column pier described in Embodiment 1;

[0026] Figure 2 It is an exploded schematic view of a partial structure of an assembled multi-column pier described in Embodiment 1 Figure 1 ;

[0027] Figure 3 It is an exploded schematic view of a partial structure of an assembled multi-column pier described in Embodiment 1 Figure 2 ;

[0028] Figure 4 It is a schematic cross-sectional structure diagram of an assembled multi-column pier described in Embodiment 2 Figure 1 ;

[0029] Figure 5 It is a schematic cross-sectional structure diagram of an assembled multi-column pier described in Embodiment 2 Figure 2 ;

[0030] Figure 6 Schematic diagram of the structure of a prefabricated multi-column pier described in Embodiment 3.

[0031] Markings in the figure: 1 - column, 2 - connecting plate, 3 - bearing platform, 4 - diaphragm connection platform, 5 - diaphragm, 61 - first boss, 62 - second boss, 63 - third boss, 71 - first groove, 72 - second groove, 73 - third groove, 81 - transverse brace, 82 - diagonal brace. Detailed implementation mode

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. Any technology implemented based on the content of the present invention belongs to the scope of the present invention.

[0033] Embodiment 1

[0034] A prefabricated multi-column pier according to the present invention includes at least one segment, and two adjacent segments are spliced and connected. The segment at the bottom is spliced and connected to the bearing platform 3. As Figures 1-3 shown, for the convenience of display in this embodiment, only one segment is shown. In actual engineering, the number of segments of the pier and the length of each segment are determined according to the design. Each segment includes at least three columns 1, and all the columns 1 are arranged along the contour of the pier. The cross-sectional form of the column 1 is not limited. Preferably, the cross-section of the column 1 is a regular polygon. The number of columns 1 is an even number, and the number of sides is also an even number, such as a square, a hexagon, an octagon, or a circle. In this embodiment, there are eight columns 1 with a regular octagon cross-section of the same size. The eight columns 1 are evenly arranged, and a connecting plate 2 is spliced and connected between two adjacent columns 1. The columns 1 and the connecting plates 2 are both prefabricated reinforced concrete components. The height of the connecting plate 2 is adapted to the height of the column 1. The column 1 and the connecting plate 2 are connected by the first boss 61 and the first groove 71 to form a hollow pier body. In this embodiment, two first bosses 61 are arranged on the corresponding sides of the column 1, and two first grooves 71 are arranged on the corresponding sides of the connecting plate 2. It can also be arranged in the reverse way. Through the matching connection of the first boss 61 and the first groove 71, and then cooperating with grouting, the stable assembly of the column 1 and the connecting plate 2 can be completed. The columns 1 between two adjacent segments are connected by the second boss 62 and the second groove 72 respectively arranged on the upper and lower end faces, and the connecting plates 2 between two adjacent segments are connected by the third boss 63 and the third groove 73 respectively arranged on the upper and lower end faces. In this embodiment, see Figures 2-3, on the upper end face of the column 1, there is the second boss 62, and on the lower end face, there is the second groove 72. On the upper end face of the connecting plate 2, there is the third groove 63, and on the lower end face, there is the third boss 73. Then, with grouting, the splicing between segments is achieved. At least one prestressed steel strand is provided in the column 1, and the prestressed steel strand is arranged along the entire length of the pier. According to the length of the segment, the steel strands of adjacent segments are connected at the connection of the second boss 62 and the second groove 72 through a connector. The top surface of the column 1 of the topmost segment is set as a plane, that is, the second boss 62 is not provided, or the second groove 72 can also be provided to facilitate grouting to seal the steel strand. The bosses and grooves provided on the bottom surface of the connecting plate 2 of the bottommost segment are adapted for splicing with the corresponding grooves and bosses on the bearing platform 2. In this embodiment, it is exemplified that two prestressed steel strands are provided in each column 1, Figures 1-3 , for the convenience of observation, only the through holes for passing the prestressed steel strands are shown. During installation, after all the segments are spliced, the prestressed steel strands are then tensioned to ensure the connection strength of the columns 1 of each segment.

[0035] Each segment further includes a diaphragm connection platform 4. The diaphragm connection platform 4 is connected to the column 1 and the connecting plate 2 through bolts connecting to embedded parts (not shown). The diaphragm connection platform 4 is used to set the diaphragm 5. The diaphragm connection platform 4 is connected to both ends of each segment to strengthen the connection performance at the segment splicing location. Both the diaphragm connection platform 4 and the diaphragm 5 are precast reinforced concrete components, reducing on-site construction steps.

[0036] For a prefabricated multi-column pier according to the present invention, in addition to being divided into several segments vertically, each segment is also assembled into a hollow pier body through columns and connecting plates. Under the condition of equal cross-sectional stiffness, the material consumption is effectively reduced, and the cost is saved. Each component can be prefabricated, effectively improving the processing quality and processing efficiency. It can enable the prefabricated pier to meet the stiffness and strength requirements for normal operation, and can also facilitate transportation and on-site stacking and hoisting. The connection performance between segments is effectively ensured through the steel strands in the columns, and the assembly is convenient and reliable, thereby ensuring the safety of the bridge structure and vehicle operation, and effectively making up for the shortcomings of traditional prefabricated piers such as weak connection performance, and the cross-sectional dimensions, stiffness, and quality being restricted by transportation conditions and installation construction conditions.

[0037] Embodiment 2

[0038] A prefabricated multi-column pier according to the present invention has a structure substantially the same as that of Embodiment 1, and the difference lies in that, as Figure 4 shown, the column 1 is square, and the pier includes four such columns 1.

[0039] It can also be as Figure 5, the cross-section of the column 1 is circular, and the pier comprises 10 such columns 1.

[0040] The number of the columns 1 has nothing to do with the number of sides of the column 1. Preferably, however, the number of sides of the column 1 is the same as its number, and preferably, the column 1 with a polygonal cross-section is adopted. Compared with the circular cross-section, it is convenient for stable connection with the connecting plate 2.

[0041] Embodiment 3

[0042] A prefabricated multi-column pier according to the present invention has a structure substantially the same as that of Embodiment 1, except that, as Figure 6 shown, the connecting plate 2 can be replaced by a steel connector. The steel connector comprises a plurality of cross braces 81 and a plurality of diagonal braces 82. If the cross braces 81 and the diagonal braces 82 are both angle steels or steel pipes, embedded parts are provided on the column 1, and both ends of the cross braces 81 and both ends of the diagonal braces 82 are connected to the embedded parts by bolts so as to realize connection with the corresponding column 1.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A prefabricated multi-column bridge pier, characterized in that, it comprises at least one segment, and two adjacent segments are spliced and connected. Each segment comprises at least three columns (1), and all the columns (1) are arranged along the contour of the bridge pier. A connecting plate (2) is spliced and connected between two adjacent columns (1). Both the columns (1) and the connecting plate (2) are reinforced concrete members. The height of the connecting plate (2) is adapted to the height of the columns (1). At least one prestressed steel strand is provided in the columns (1), and the prestressed steel strand is arranged along the whole length of the bridge pier. The cross-section of the columns (1) is a regular polygon. The number of the columns (1) comprised in each segment is an even number. The number of sides of the columns (1) is an even number, and the number of sides of the columns is the same as their number. The number of sides of the columns is greater than 6. The thickness of the connecting plate (2) is less than the in-circle diameter of the columns (1).

2. The bridge pier according to claim 1, characterized in that, the segment further comprises a diaphragm connecting platform (4), and the diaphragm connecting platform (4) is used for arranging a diaphragm (5).

3. The bridge pier according to claim 2, characterized in that, the diaphragm connecting platform (4) is connected to both ends of the segment.

4. The bridge pier according to claim 1, characterized in that, the columns (1) and the connecting plate (2) are connected through a first boss (61) and a first groove (71).

5. The bridge pier according to claim 1, characterized in that, two adjacent segments are connected through a second boss (62) and a second groove (72) on the upper and lower end faces of the columns (1) and a third boss (63) and a third groove (73) on the upper and lower end faces of the connecting plate (2).

6. The bridge pier according to any one of claims 1-5, characterized in that, the lowermost segment is spliced and connected to a bearing platform (3).

7. The bridge pier according to any one of claims 1-5, characterized in that, the connecting plate (2) can be replaced by a steel connector, and the steel connector comprises a plurality of cross braces (81) and a plurality of diagonal braces (82).

8. The bridge pier according to claim 7, characterized in that, both ends of the cross braces (81) and both ends of the diagonal braces (82) are bolted to the corresponding columns (1).

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