Self-resetting fabricated pier based on tenon-and-mortise connection and construction technology of self-resetting fabricated pier

Abstract

The invention relates to a self-resetting fabricated bridge pier based on mortise and tenon connection and a construction technology thereof. The self-resetting fabricated bridge pier comprises a bearing platform, a prefabricated bridge pier lower section arranged on the upper surface of the bearing platform, a prefabricated bridge pier upper section and a cover beam integrally prefabricated with the prefabricated bridge pier upper section. A lower section mortise is formed in the upper surface of the prefabricated pier lower section, and a pre-buried corrugated pipe is arranged in the prefabricated pier lower section; an upper section tenon is arranged on the lower surface of the prefabricated pier upper section, longitudinal steel bar sets are arranged in the prefabricated pier upper section and the bent cap body, and through holes and prestressed tendon sets anchored in the through holes are correspondingly arranged on the bearing platform, the prefabricated pier lower section, the prefabricated pier upper section and the bent cap body. The bearing capacity and the energy dissipation capacity of the structure can be improved; the prestressed tendons can improve the self-resetting capability of the pier and improve the stability of the structure; all the components can be manufactured in a prefabrication factory in advance, the construction period is greatly shortened, and the construction efficiency is improved.

Description

Technical field: The invention relates to a novel prestressed structure technology of an assembled pier, in particular to a self-resetting assembled pier based on mortise and tenon connection and a construction process thereof. Background technology: At present, the prefabricated pier structure is prone to tilt after being impacted by a large external force, which can easily cause the risk of building collapse.

[0003] For example, the Chinese patent "A method for making a bridge pier with high strength and high ductility slit steel pipe mortise and tenon joints", publication number CN117364617A, includes a cap, both sides of the top end face of the cap are provided with cap vertical steel bars, a bridge pier column is provided on the top of the cap vertical steel bars, and the upper and lower ends of the pier column are respectively provided with column top vertical steel bars and column longitudinal bars; in the method for making a bridge pier with high strength and high ductility slit steel pipe mortise and tenon joints, the upper and lower steel pipe mortise and tenon joints divide the entire steel plate into a plurality of thin steel plates by slotting. Although the patent increases the aspect ratio of the steel plate, the steel plate that originally undergoes shear deformation undergoes bending deformation, enhances ductility and energy dissipation capacity, and prevents the steel pipe from having a large difference in stiffness between the steel pipe and the post-cast concrete due to the excessive thickness or thinness of the steel pipe wall, and the concrete and the steel pipe cannot be deformed in coordination under load, resulting in brittle shear failure of the concrete; however, it is easy to tilt after being subjected to a large external impact, and cannot achieve automatic recovery after tilting, which easily causes the risk of building collapse.

[0004] Another example is the Chinese patent "A modular prefabricated segment assembled railway solid bridge pier", publication number CN109778681A. The solid bridge pier of this patent application is composed of three types of segments stacked together. The first segment is a complete piece, the second segment includes three modules, and the third segment includes four modules. The modules are tightly engaged by mortise and tenon joints. The grooves and bosses of the shear keys on the modules and the upper surface of the modules are coated with epoxy adhesive on the segment contact surface and the mortise and tenon joints of the modules. The three prefabricated segments are provided with embedded corrugated pipes along the length direction, and the embedded channels are kept in the same position so that the prestressed tendons and ordinary steel bars can be connected through. High-strength slurry is injected between the corrugated pipe and the prestressed steel bars, and ultra-high performance concrete UHPC is injected between the corrugated pipe and the ordinary steel bars to connect the prefabricated bridge pier segments into one. Although the invention divides the bridge pier segments into several modules, reducing the volume and mass, and is convenient and quick to prefabricate in the factory, greatly improving construction efficiency and reducing engineering costs, the patent is prone to tilting after being impacted by a large external force, and cannot automatically recover after tilting, which can easily cause the risk of building collapse. Summary of the invention: In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a self-centering prefabricated pier based on mortise and tenon connection, which has a simple structure, is convenient and fast to construct, and can self-center, as well as its construction technology.

[0006] The self-centering prefabricated pier of the present invention based on mortise and tenon connection is characterized in that: it includes a bearing platform, a prefabricated lower pier segment arranged on the upper surface of the bearing platform, a prefabricated upper pier segment, and a capping beam prefabricated integrally with the prefabricated upper pier segment; a lower segment mortise groove is arranged on the upper surface of the prefabricated lower pier segment, and a buried corrugated pipe is arranged in the body of the prefabricated lower pier segment; an upper segment tenon is arranged on the lower surface of the prefabricated upper pier segment, a longitudinal steel bar group is arranged in the bodies of the prefabricated upper pier segment and the capping beam, through holes are correspondingly arranged on the bearing platform, the prefabricated lower pier segment, the prefabricated upper pier segment and the capping beam, and a prestressed tendon group anchored in the through holes, the first end of the prestressed tendon group is anchored in the counterbore on the lower surface of the bearing platform, and the second end of the prestressed tendon group is anchored in the counterbore on the upper surface of the capping beam.

[0007] Preferably, the lower end of the above-mentioned longitudinal steel bar group extends out of the lower surface of the prefabricated upper pier segment. When the upper segment tenon and the lower segment mortise groove are matched, grouting material is poured into the corrugated pipe before the lower end of the longitudinal steel bar group extends into the corrugated pipe.

[0008] Preferably, the above-mentioned upper segment tenon is prefabricated with UHPC.

[0009] Preferably, the material of the above-mentioned prestressed tendon group is carbon fiber reinforced composite material.

[0010] Preferably, the upper end of the above-mentioned longitudinal steel bar group extends into the capping beam and is bent at the end.

[0011] Preferably, multiple groups of the above-mentioned longitudinal steel bar groups are arranged in the circumferential direction, and multiple groups of the corrugated pipes are correspondingly arranged in the circumferential direction corresponding to the longitudinal steel bar groups.

[0012] The construction technology of the self-centering prefabricated pier of the present invention based on mortise and tenon connection is characterized in that: (1), fabricate a prefabricated lower pier segment with a lower segment mortise groove and a corrugated pipe, a prefabricated upper pier segment with an upper segment tenon and a longitudinal steel bar group, and a prestressed tendon group in the factory; (2), transport the above components to the construction site for rapid installation. The second end of the prestressed tendon group penetrates from the counterbore on the lower surface of the bearing platform into the through hole from bottom to top, extends out from the lower segment mortise groove, and then penetrates into the through hole of the upper segment tenon until it extends out from the counterbore on the upper surface of the capping beam. Then, pour grouting material into the reserved corrugated pipe, and then match the upper segment tenon with the lower segment mortise groove, and the lower end of the longitudinal steel bar group extends into the corrugated pipe; (3) Use a tensioning tool to tension the second end of the prestressed tendon group, and use a tensioning end anchor to anchor it in the sunken hole on the upper surface of the capping beam.

[0013] The tenon and mortise connection of steel components between the precast segments of the pier of the present invention can improve the bearing capacity and energy dissipation capacity of the structure; the prestressed tendons can improve the self-centering ability of the pier and enhance the stability of the structure; each component can be prefabricated in a precast factory in advance and can be quickly installed at the construction site, greatly shortening the construction period and improving the construction efficiency. Description of the drawings: Figure 1 is a schematic diagram of the connection structure of the present invention; In the figure: 1, upper precast pier segment; 2, lower precast pier segment; 3, upper segment tenon; 4, lower segment mortise; 5, prestressed tendon group; 6, longitudinal steel bar group; 7, corrugated pipe; 8, capping beam; 9, bearing platform; 10, through hole. Specific implementation manners: The present invention will be further described below in conjunction with the drawings and specific implementation manners.

[0016] The self-centering assembled pier based on tenon and mortise connection of the present invention includes a bearing platform 9, a lower precast pier segment 2 arranged on the upper surface of the bearing platform 9, an upper precast pier segment 1, and a capping beam 8 precast integrally with the upper precast pier segment.

[0017] Among them, the upper surface of the lower precast pier segment 2 is provided with a lower segment mortise 4, and the lower segment mortise 4 can be arc-shaped. A buried corrugated pipe 7 is arranged in the lower precast pier segment body; the lower surface of the upper precast pier segment is provided with an upper segment tenon 3, and the upper segment tenon 3 is precast with UHPC and is semi-spherical, and it mates with the lower segment mortise 4.

[0018] Longitudinal steel bar groups 6 are arranged in the upper precast pier segment 1 and the capping beam 8. The upper ends of the longitudinal steel bar groups extend into the capping beam and are bent at the ends; the lower ends of the longitudinal steel bar groups 6 extend out of the lower surface of the upper precast pier segment. Before the lower ends of the longitudinal steel bar groups 6 extend into the corrugated pipe 7, grouting material is poured into the corrugated pipe.

[0019] Multiple groups of longitudinal steel bar groups are arranged in the circumferential direction, and multiple groups of corrugated pipes are arranged corresponding to the longitudinal steel bar groups in the circumferential direction.

[0020] Through holes are correspondingly provided on the bearing platform 9, the lower segment 2 of the precast pier, the upper segment 1 of the precast pier, and the capping beam 8, and a prestressed tendon group 5 is anchored in the through holes 10. The prestressed tendon group is made of carbon fiber reinforced composite material. By applying prestress in advance, the assembled pier made of this material has a better ability to return to the initial state after being subjected to external forces. The first end of the prestressed tendon group is anchored in the counterbore on the lower surface of the bearing platform, and the second end of the prestressed tendon group is anchored in the counterbore on the upper surface of the capping beam. To improve the anchoring reliability of the lower end of the longitudinal steel bar group and the grout in the prestressed corrugated pipe, the lower end of the longitudinal steel bar group is welded with T-shaped shear studs. By increasing the mechanical biting effect of the steel bar-grout contact surface, the stress transfer path can be effectively improved, and bond slip can be prevented under dynamic loads.

[0021] In the present invention, prestress is applied to the prestressed tendon group in advance, so that the assembled pier can return to the initial state after being subjected to external forces. Through the anchorages at the ends of the prestressed tendon group and by extending the embedding depth of the prestressed tendon group into the precast pier segments, the bearing platform, and the capping beam, the bond between the prestressed tendon group and the precast pier segments, the bearing platform, and the capping beam is enhanced, ensuring effective collaborative work among them.

[0022] The present invention adopts a combination of mortise-tenon connection and prestress connection to achieve precise splicing accuracy, and both the bearing capacity and stiffness of the overall structure are enhanced. At the same time, the assembled technology shortens the construction period significantly through factory prefabrication and on-site assembly, improving construction efficiency and construction quality. With high-precision connection technology and modular construction mode, it is superior to the traditional cast-in-place process in terms of stability, construction efficiency, and comprehensive cost, and is suitable for urban rapid construction and bridge construction in complex terrains, and has a wide application prospect in areas with high seismic intensity and coastal corrosion areas.

[0023] The construction process of the self-centering assembled pier based on mortise-tenon connection of the present invention (1) Fabricate the lower segment of the precast pier with a mortise groove and corrugated pipe at the factory, the upper segment of the precast pier with a tenon head and a longitudinal steel bar group, and the prestressed tendon group. (2) Transport the above components to the construction site for rapid installation. The second end of the prestressed tendon group passes through the through hole from the counterbore on the lower surface of the bearing platform from bottom to top, extends out from the mortise groove of the lower segment, and then passes through the through hole of the tenon head of the upper segment until it extends out from the counterbore on the upper surface of the capping beam. Then, grout is poured into the reserved corrugated pipe, and then the tenon head of the upper segment is paired with the mortise groove of the lower segment, and the lower end of the longitudinal steel bar group extends into the corrugated pipe. (3) Use a tensioning tool to tension the second end of the prestressed tendon group and anchor it in the counterbore on the upper surface of the capping beam with a tensioning end anchor.

[0024] The tenon and mortise connection of steel components between precast segments of the pier in the present invention can improve the bearing capacity and energy dissipation capacity of the structure; the prestressed tendons can improve the self-centering capacity of the pier and enhance the stability of the structure; each component can be prefabricated in a precast factory in advance and transported to the construction site for rapid installation, greatly shortening the construction period and improving the construction efficiency.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A self - resetting prefabricated pier based on mortise - tenon connection, characterized in that: It includes a bearing platform, a precast lower section of a bridge pier arranged on the upper surface of the bearing platform, a precast upper section of the bridge pier, and a capping beam precast integrally with the precast upper section of the bridge pier; a lower section mortise groove is provided on the upper surface of the precast lower section of the bridge pier, and embedded corrugated pipes are arranged in the body of the precast lower section of the bridge pier; an upper section tenon is provided on the lower surface of the precast upper section of the bridge pier, longitudinal steel bar groups are arranged in the precast upper section of the bridge pier and the capping beam, through holes are correspondingly provided on the bearing platform, the precast lower section of the bridge pier, the precast upper section of the bridge pier, and the capping beam, and prestressed tendon groups anchored in the through holes, the first ends of the prestressed tendon groups are anchored in the counterbores on the lower surface of the bearing platform, and the second ends of the prestressed tendon groups are anchored in the counterbores on the upper surface of the capping beam.

2. The self - resetting prefabricated bridge pier based on mortise - tenon connection according to claim 1, wherein: The lower ends of the longitudinal steel bar groups extend out of the lower surface of the precast upper section of the bridge pier. When the upper section tenon and the lower section mortise groove are matched, grouting material is poured into the corrugated pipes before the lower ends of the longitudinal steel bar groups extend into the corrugated pipes.

3. The self - resetting prefabricated bridge pier based on mortise - tenon connection according to claim 1 or 2, characterized in that: The upper section tenon is precast using UHPC.

4. The self - resetting prefabricated pier based on mortise - tenon connection according to claim 3, characterized in that: The material of the prestressed tendon groups is carbon fiber reinforced composite material.

5. The self - resetting prefabricated pier based on mortise - tenon connection according to claim 4, wherein: The upper ends of the longitudinal steel bar groups extend into the capping beam and are bent at the ends.

6. The self - resetting prefabricated bridge pier based on mortise - tenon connection according to claim 5, wherein: Multiple groups of the longitudinal steel bar groups are arranged in the circumferential direction, and multiple groups of the corrugated pipes are correspondingly arranged in the circumferential direction corresponding to the longitudinal steel bar groups.

7. A construction process of a self-centering assembled bridge pier based on mortise and tenon connection according to any one of claims 1-6, characterized in that: (1), fabricate a precast lower section of a bridge pier with a lower section mortise groove and corrugated pipes, a precast upper section of the bridge pier with an upper section tenon and longitudinal steel bar groups, and prestressed tendon groups in a factory; (2), transport the above components to the construction site for rapid installation. The second ends of the prestressed tendon groups penetrate the through holes from the counterbores on the lower surface of the bearing platform from bottom to top, extend out from the lower section mortise groove, and then penetrate into the through holes of the upper section tenon until they extend out from the counterbores on the upper surface of the capping beam. Then, pour grouting material into the reserved corrugated pipes, and then match the upper section tenon with the lower section mortise groove, and the lower ends of the longitudinal steel bar groups extend into the corrugated pipes; (3), use a tensioning tool to tension the second ends of the prestressed tendon groups and use tensioning end anchors to anchor them in the counterbores on the upper surface of the capping beam.

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