Stainless steel-ecc assembled pier-column-foundation joint connection structure and method in high intensity area

Abstract

The present application relates to a high-intensity area stainless steel-ECC assembly type pier column-foundation node connection structure and method, and belongs to the technical field of structural engineering. The structure comprises a prefabricated concrete pier column and a concrete foundation, and the node is connected by a high-strength stainless steel grouting sleeve and a UHPC grouting socket connection to ensure good seismic performance. The prefabricated concrete pier column is composed of ordinary concrete, longitudinal ordinary steel bars, ordinary stirrups, ECC concrete, longitudinal stainless steel bars, longitudinal high-strength stainless steel bars, embedded grouting sleeves, embedded grouting pipes, embedded grouting pipes, and pier FRP stirrups. The concrete foundation is composed of reserved high-strength stainless steel bars, reserved socket grooves, longitudinal foundation steel bars, ring stirrups, and foundation stirrups. The present application can break through the bottleneck problem of limiting the reliability and seismic safety of the assembly type pier node connection in high-intensity areas, and can be widely applied to the construction and expansion of bridges and marine engineering structures in high-intensity areas.

Description

TECHNICAL FIELD

[0001] The application relates to an assembled pier column-foundation node connecting structure, in particular to a high-intensity-area stainless steel-ECC assembled pier column-foundation node connecting structure and method, and belongs to the technical field of structural engineering. BACKGROUND

[0002] Transportation is a basic, leading and strategic industry in the national economy, and is an important service industry and an important part of the modern economic system. With the acceleration of urbanization and the continuous improvement of transportation infrastructure, bridge construction is facing more and more challenges, and it is urgent to improve the efficiency and quality of bridge construction and promote the use of bridges in high-intensity marine environments. The traditional bridge pier construction technology has the disadvantages of long construction period, large investment of manpower and material resources, and difficult quality control, and cannot meet the requirements of modern bridge construction on environmental protection and sustainable development. The prefabricated construction technology adopts the construction method of factory processing of components and on-site assembly, has the advantages of less environmental pollution, small impact on traffic, short construction period, high construction quality and significant economic benefits, and can well meet the needs of modern bridge construction.

[0003] China is a large maritime country and is located between the Pacific Rim earthquake belt and the Eurasian earthquake belt. Offshore areas have frequent seismic activity. At the same time, there is an increasing demand for new technologies for cross-sea bridges, and the pier column-foundation node is a relatively important part of the entire bridge structure. Its seismic performance, corrosion resistance and post-disaster rapid repair in high-intensity marine environments are particularly important. At present, most of the bridge prefabricated assembly substructure node connection technologies in China are applied in non-strong seismic areas, and there is a lack of application in high-intensity marine environments. Therefore, a prefabricated pier column-foundation connection structure suitable for high-intensity marine environments is urgently needed.

[0004] In the traditional assembled pier node connection technology, the socket connection has the advantages of small construction precision, high component quality, short construction period and good seismic performance, but in order to ensure its seismic performance, the socket depth is increased, the foundation size is large, and the foundation cost is increased. At the same time, the assembled pier node is prone to corrosion in marine environments, which significantly reduces its seismic performance and limits its application in marine engineering. For example, CN110359363A discloses a partially bonded prestressed assembled self-centering bridge pier node and method, which comprises a pier column, the main body of the pier column is formed by concrete, the lower end of the pier column is inserted into the foundation and fixedly connected with the foundation, and the upper end is fixedly connected with the bent cap. It also has the problems of large socket depth and unsuitability for marine environments.

[0005] Therefore, a new type of assembled pier column-foundation node connecting structure and construction method capable of meeting the seismic performance requirements and corrosion resistance of bridges in high-intensity marine environments is urgently needed. SUMMARY

[0006] In view of the above defects of the prior art, the present application provides a high-intensity area stainless steel-ECC assembly type pier column-foundation node connection structure and method, which can not only meet the seismic performance and corrosion resistance of the assembly type pier column-foundation node connection in the high-intensity area marine environment, but also significantly reduce the socket depth, thereby reducing the foundation cost and having the characteristics of simple construction process. Meanwhile, the node structure also has the advantages of good ductility, high energy dissipation capacity and rapid post-earthquake repair. The present application provides technical support for the promotion and application of prefabricated assembly construction technology in high-intensity area bridges and marine structure engineering in cross-sea, highway and municipal areas.

[0007] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0008] The high-intensity area stainless steel-ECC assembly type pier column-foundation node connection structure is composed of a prefabricated concrete pier column and a concrete foundation, and the prefabricated concrete pier column is inserted into a socket groove of the concrete foundation.

[0009] The prefabricated concrete pier column includes an upper ordinary concrete pier column and a lower ECC concrete pier column, and the upper ordinary concrete pier column includes pier body longitudinal ordinary steel bars and pier body ordinary stirrups wrapped and cast together by ordinary concrete.

[0010] The lower ECC concrete pier column includes pier body longitudinal stainless steel bars, pier body longitudinal high-strength stainless steel bars, a pre-buried grouting sleeve, a pre-buried grouting pipe, a pre-buried grouting-out pipe and a pier body FRP stirrup wrapped and cast together by ECC concrete.

[0011] The pier body longitudinal stainless steel bars and the pier body longitudinal ordinary steel bars, and the pier body longitudinal high-strength stainless steel bars and the pier body longitudinal ordinary steel bars are vertically and correspondingly connected together through steel bar connectors. The lower end of the pier body longitudinal high-strength stainless steel bars is inserted into the pre-buried grouting sleeve. The pre-buried grouting sleeve is pre-buried at the bottom of the prefabricated concrete pier column, and the side wall thereof is connected with the pre-buried grouting pipe and the pre-buried grouting-out pipe which extend to the surface of the concrete pier column.

[0012] The concrete foundation further includes foundation longitudinal steel bars, foundation stirrups and foundation reserved high-strength stainless steel bars. The foundation stirrups are arranged around the socket groove, penetrate the middle part of the concrete foundation and lap with the foundation longitudinal steel bars. The foundation reserved high-strength stainless steel bars are located at the bottom of the socket groove of the concrete foundation, the top thereof extends out of the socket groove and is correspondingly connected with the pier body longitudinal high-strength stainless steel bars through the pre-buried grouting sleeve, and the lower end thereof is anchored with the foundation longitudinal steel bars.

[0013] High-strength concrete UHPC is grouted between the inner wall of the socket groove of the concrete foundation and the side wall of the bottom of the prefabricated pier column.

[0014] Further, the length of the foundation reserved high-strength stainless steel inserted into the reserved grouting sleeve is not less than 5 times the diameter of the foundation reserved high-strength stainless steel; and the diameter of the embedded grouting sleeve is not less than 2-3 times the diameter of the longitudinal high-strength stainless steel of the pier body.

[0015] Further, the length of the longitudinal ordinary steel of the pier body, the longitudinal stainless steel of the pier body and the longitudinal high-strength stainless steel of the pier body inserted into the steel connector is not less than 3 times the diameter of the longitudinal stainless steel of the pier body.

[0016] Further, the thickness of the steel connector is not less than 2 mm.

[0017] Further, the compressive strength of the high-strength concrete UHPC is not less than 120 MPa, and the tensile strength is not less than 10 MPa.

[0018] Further, the number of the foundation reserved high-strength stainless steel is 1 / 2-1 / 4 times the number of the longitudinal ordinary steel of the pier body; and the depth of the socket of the prefabricated concrete pier is not less than 0.6 times the diameter of the prefabricated concrete pier.

[0019] Further, the inner diameter of the embedded grouting sleeve is 20-40 mm larger than the longitudinal high-strength stainless steel of the pier body, and the thickness is not less than 2 mm; the inner diameter of the embedded grouting pipe and the embedded grouting pipe is 20-40 mm, and the wall thickness is not less than 0.5 mm.

[0020] Further, the embedded grouting pipe and the embedded grouting pipe are respectively connected to the bottom and the top of the embedded grouting sleeve; the embedded grouting sleeves are uniformly arranged on the circumference of the lower ECC concrete pier cross section, and are spaced apart by a plurality of longitudinal stainless steels of the pier body.

[0021] Further, a 10-30 mm grouting layer is arranged between the bottom surface of the prefabricated concrete pier and the bottom surface of the concrete foundation socket.

[0022] The construction method of the above-mentioned high-intensity area stainless steel-ECC assembled pier column-foundation node connection structure comprises the following steps:

[0023] S1, in the factory, the longitudinal ordinary steel of the pier body and the ordinary stirrup of the pier body are bound, the steel mesh frame is formed after the binding of the longitudinal ordinary steel of the pier body and the ordinary stirrup of the pier body is completed, the formwork is supported, the ordinary concrete is poured, the specimen is maintained, the formwork is removed, and the upper part of the pier column is completed; then the steel connector is installed at the end of the reserved longitudinal ordinary steel of the pier body, the longitudinal stainless steel of the pier body and the longitudinal high-strength stainless steel of the pier body are connected with the longitudinal ordinary steel of the pier body through the steel connector, the FRP stirrup of the pier body, the embedded grouting sleeve, the embedded grouting pipe and the embedded grouting pipe are bound again, the lower steel mesh frame of the pier column is formed, the formwork is supported, the ECC concrete is poured, the specimen is maintained, the formwork is removed, and the prefabricated concrete pier is completed.

[0024] S2, the longitudinal reinforcement of the concrete foundation is tied on site, the foundation hoop is tied, the socket groove for placing the prefabricated concrete pier column is reserved, the foundation reserved high-strength stainless steel bar is reserved and accurately positioned, and finally the formwork is supported, the concrete is poured, and the prefabricated foundation is completed;

[0025] S3, the prefabricated concrete pier column is transported to the construction site, a 10-30mm bedding layer is laid on the bottom surface of the concrete foundation socket groove, the foundation reserved high-strength stainless steel bar extending out of the concrete foundation socket groove is inserted into the pre-buried grouting sleeve of the prefabricated concrete pier column, the levelness and perpendicularity of the prefabricated concrete pier column are adjusted, and the placement of the prefabricated concrete pier column is completed;

[0026] S4, high-strength concrete UHPC is mixed on site, the high-strength concrete UHPC is filled into the pre-buried grouting pipe by using a high-pressure grouting device, the high-strength concrete UHPC is injected into the grouting sleeve through the pre-buried grouting pipe by using a grouting method, until the high-strength concrete UHPC overflows from the pre-buried grouting port, so that the high-strength concrete UHPC in the grouting sleeve is full; high-strength concrete UHPC is injected between the bottom side wall of the prefabricated concrete pier column and the inner wall of the concrete foundation socket groove, so that the prefabricated concrete pier column and the concrete foundation are connected into a whole, and the assembly of the prefabricated concrete pier column and the concrete foundation is completed.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1. The prefabricated assembly construction technology is adopted, the pier column is manufactured and processed by a component factory and then transported to the construction site, the component construction quality is improved, and the construction process at the construction site is reduced; the prefabricated concrete pier column and the concrete foundation are connected in combination by using the UHPC grouting socket and the grouting sleeve, which has the advantages of quick splicing, high fault tolerance and efficient connection, and the industrialization level of building and bridge structure construction is improved, and the energy consumption and environmental pollution are reduced.

[0029] 2. The stainless steel bar-ECC concrete combined section is used at the bottom of the pier column, the ECC has excellent damage tolerance, self-repairing characteristics and durability in harsh environments, can reduce the damage of the pier column plastic hinge zone after the earthquake, realize the rapid recovery of the post-earthquake capacity of the bridge, the stainless steel bar can realize the good corrosion resistance of the pier column in marine and other corrosive environments, greatly reduce the mechanical performance degradation of the pier column caused by corrosion and other adverse environments, and the combination of the ECC material can greatly ensure the good seismic performance of the pier column in the marine environment in the medium and high intensity area.

[0030] 3. The use of ultra-high performance concrete (UHPC) as grouting material for the socket connection between the pier column and the pile cap can effectively improve the bonding performance and shear capacity between the interface of the pier column and the pile cap, and enhance the safety and reliability of the interface connection under long-term use load (dead load, vehicle) and occasional load (earthquake, impact).

[0031] 4. The bottom section of the pier column uses a combination of high-strength stainless steel longitudinal reinforcement and ordinary stainless steel longitudinal reinforcement, with the high-strength stainless steel reinforcement accounting for only 1 / 2 to 1 / 4 of the total longitudinal reinforcement. The high-strength stainless steel reinforcement is pre-buried in the grouting sleeve and connected to the corresponding high-strength stainless steel reinforcement reserved in the pile cap, which greatly ensures the splicing efficiency and quality, and enhances the reliability and pull-out resistance of the node connection.

[0032] 5. Based on the UHPC grouting socket connection between the stainless steel reinforced ECC pier column and the pile cap, the high-strength stainless steel longitudinal reinforcement at the bottom of the pier column is connected to the high-strength stainless steel reinforcement reserved in the pile cap through the grouting sleeve, which can greatly reduce the socket depth, meet the bending moment capacity requirements of the node area under axial and horizontal loads in high-intensity areas, effectively ensure the good seismic performance and durability of the node area, and realize the efficient and high-quality construction of prefabricated buildings and bridge structures in corrosive environments such as the ocean. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the elevation schematic diagram of the present application;

[0034] Figure 2 is the A-A sectional schematic diagram of the present application; Figure 1

[0035] Figure 3 is the B-B sectional schematic diagram of the present application; Figure 1

[0036] Figure 4 is the C-C sectional schematic diagram of the present application; Figure 1

[0037] Figure 5 is the prefabricated pier column processing schematic diagram of the present application, wherein: (a) is the steel reinforcement skeleton binding schematic diagram; (b) is the pier column longitudinal reinforcement and stainless steel reinforcement connection schematic diagram; (c) is the pre-buried grouting sleeve placement diagram; (d) is the prefabricated concrete pier column overall diagram;

[0038] Figure 6 is the concrete foundation processing schematic diagram of the present application, wherein: (a) is the steel reinforcement skeleton binding schematic diagram; (b) is the reserved high-strength stainless steel reinforcement placement schematic diagram; (c) is the concrete foundation overall diagram;

[0039] Figure 7 ​​​This is a three-dimensional schematic diagram of the prefabricated assembled pier-foundation of the present invention, wherein: (a) is a prefabricated concrete pier; (b) is a concrete foundation; (c) is a diagram of the longitudinal stainless steel reinforcement of the pier body being inserted and assembled; (d) is a schematic diagram of grouting into the pre-embedded grouting sleeve through the pre-embedded grouting pipe; (e) is a schematic diagram of grouting in the gap between the insertion and insertion; and (f) is an overall view of the assembled pier-foundation. Detailed Implementation

[0040] The following is in conjunction with the appendix Figures 1-7 The present invention will be further described in detail below to facilitate a clear understanding of the invention, but these descriptions do not constitute a limitation thereof.

[0041] Example 1

[0042] As attached Figures 1-4 As shown, the stainless steel-ECC prefabricated pier-foundation node connection structure in the high-intensity seismic zone of this embodiment consists of a precast concrete pier 1 and a concrete foundation 2, with the precast concrete pier 1 inserted into the socket of the concrete foundation 2.

[0043] like Figure 1 As shown, the precast concrete pier 1 includes an upper ordinary concrete pier column and a lower ECC concrete pier column. The upper ordinary concrete pier column includes longitudinal ordinary steel bars 4 and ordinary stirrups 3 of the pier body, which are encased and cast together by ordinary concrete. The lower ECC concrete pier column includes longitudinal stainless steel bars 8, longitudinal high-strength stainless steel bars 7, pre-embedded grouting sleeves 14, pre-embedded grouting pipes 13, pre-embedded grout outlet pipes 20, and FRP stirrups 18 of the pier body, which are encased and cast together by ECC concrete 6.

[0044] In this embodiment, as Figure 1 As shown, the longitudinal stainless steel reinforcement 8 and the longitudinal ordinary steel reinforcement 4 of the pier body, as well as the longitudinal high-strength stainless steel reinforcement 7 and the longitudinal ordinary steel reinforcement 4 of the pier body, are vertically connected together via steel bar connectors 5. The lower end of the longitudinal high-strength stainless steel reinforcement 7 is inserted into the pre-embedded grouting sleeve 14. The pre-embedded grouting sleeve 14 is pre-embedded at the bottom of the precast concrete pier column 1, and its side wall is connected to a pre-embedded grouting pipe 13 and a pre-embedded grout outlet pipe 20 extending to the surface of the concrete pier column 1. The pre-embedded grouting pipe 13 and the pre-embedded grout outlet pipe 20 are respectively connected to the bottom and top of the pre-embedded grouting sleeve 14. Four pre-embedded grouting sleeves 14 are evenly arranged on the circumference of the cross-section of the lower ECC concrete pier column, and three longitudinal stainless steel reinforcements 8 of the pier body are spaced apart. Figure 4 As shown.

[0045] In this embodiment, the concrete foundation 2 further comprises foundation longitudinal reinforcement 12, foundation stirrup 16 and foundation reserved high-strength stainless steel bar 15. The foundation stirrup 16 is arranged around the socket groove, penetrates the middle part of the concrete foundation 2 and overlaps with the foundation longitudinal reinforcement 12. The foundation reserved high-strength stainless steel bar 15 is located at the bottom of the socket groove of the concrete foundation 2, the top of which extends out of the socket groove and is connected with the pier body longitudinal high-strength stainless steel bar 7 through the pre-buried grouting sleeve 14, and the lower end is anchored with the foundation longitudinal reinforcement 12.

[0046] In addition, in this embodiment, high-strength concrete UHPC 11 is poured between the inner wall of the socket groove of the concrete foundation 2 and the bottom side wall of the prefabricated pier column 1.

[0047] In this embodiment, the specific performance parameters of each component and material are as follows: the length of the foundation reserved high-strength stainless steel bar 15 inserted into the reserved grouting sleeve 14 is not less than 5 times the diameter of the foundation reserved high-strength stainless steel bar 15. The diameter of the pre-buried grouting sleeve 14 is not less than 2-3 times the diameter of the pier body longitudinal high-strength stainless steel bar 7. The length of the pier body longitudinal ordinary steel bar 4, the pier body longitudinal stainless steel bar 8 and the pier body longitudinal high-strength stainless steel bar 7 inserted into the steel bar connector 5 is not less than 3 times the diameter of the pier body longitudinal stainless steel bar 8. The thickness of the steel bar connector 5 is not less than 2 mm. The number of the foundation reserved high-strength stainless steel bar 15 is 1 / 2-1 / 4 times the number of the pier body longitudinal ordinary steel bar 4. The socket depth of the prefabricated concrete pier column 1 is not less than 0.6 times the diameter of the prefabricated concrete pier column 1. The inner diameter of the pre-buried grouting sleeve 14 is 20-40 mm larger than the pier body longitudinal high-strength stainless steel bar 7, and the thickness is not less than 2 mm. The inner diameter of the pre-buried grouting pipe 13 and the pre-buried grouting pipe 20 is 20-40 mm, and the wall thickness is not less than 0.5 mm. The compressive strength of the high-strength concrete UHPC 11 is not less than 120 MPa, and the tensile strength is not less than 10 MPa.

[0048] Embodiment 2

[0049] In this embodiment, a 20 mm grouting layer 17 is arranged between the bottom surface of the prefabricated concrete pier column 1 and the bottom surface of the socket groove of the concrete foundation 2. The other structures and connection methods are the same as those of embodiment 1, which will not be described in detail here.

[0050] Embodiment 3

[0051] The specific construction method of the above-mentioned stainless steel-ECC assembled pier column-foundation node connection structure in high-intensity area of embodiment 2 comprises the following steps:

[0052] S1, as Figure 5As shown, the longitudinal ordinary reinforcement 4 and the ordinary stirrup 3 of the pier body are tied in the factory, the reinforcement net frame is formed after the longitudinal ordinary reinforcement 4 and the ordinary stirrup 3 of the pier body are tied, the formwork is supported, the ordinary concrete is poured, the specimen is cured, the formwork is removed, and the manufacture of the upper part of the pier column is completed. Then the reinforcement connector 5 is installed at the end of the longitudinal ordinary reinforcement 4, the longitudinal stainless steel reinforcement 8 and the longitudinal high-strength stainless steel reinforcement 7 are connected with the longitudinal ordinary reinforcement 4 through the reinforcement connector 5, the pier body FRP stirrup 18, the pre-buried grouting sleeve 14, the pre-buried grouting pipe 13 and the pre-buried grouting pipe 20 are tied, the reinforcement net frame of the lower part of the pier column is formed, the formwork is supported, the ECC concrete is poured, the specimen is cured, the formwork is removed, and the manufacture of the prefabricated concrete pier column 1 is completed.

[0053] S2, as Figure 6 shown, the longitudinal reinforcement 12 and the stirrup 16 of the concrete foundation 2 are tied on site, the socket groove for placing the prefabricated concrete pier column 1 is reserved, the reserved high-strength stainless steel reinforcement 15 of the foundation is reserved and accurately positioned, and finally the formwork is supported and the concrete is poured to complete the manufacture of the prefabricated foundation 2.

[0054] S3, the prefabricated concrete pier column 1 is transported to the construction site, a 10-30mm grouting layer 17 is laid on the bottom surface of the socket groove of the concrete foundation 2, the reserved high-strength stainless steel reinforcement 15 of the foundation extending out of the socket groove of the concrete foundation 2 is inserted into the pre-buried grouting sleeve 14 of the prefabricated concrete pier column 1, the levelness and perpendicularity of the prefabricated concrete pier column 1 are adjusted, and the placement work of the prefabricated concrete pier column 1 is completed.

[0055] S4, the high-strength concrete UHPC 11 is mixed on site, the high-strength concrete UHPC 11 is filled into the pre-buried grouting pipe 13 by using a high-pressure grouting device, the high-strength concrete UHPC 11 is injected into the grouting sleeve 14 through the pre-buried grouting pipe 13 by using the pressure grouting method, until the high-strength concrete UHPC 11 overflows from the pre-buried grouting port 10, so as to ensure that the high-strength concrete UHPC 11 in the grouting sleeve 14 is full. The high-strength concrete UHPC 11 is injected between the bottom side wall of the prefabricated concrete pier column 1 and the inner wall of the socket groove of the concrete foundation 2, so that the prefabricated concrete pier column 1 and the concrete foundation 2 are connected into an integral whole, and the assembly work of the prefabricated concrete pier column 1 and the concrete foundation 2 is completed. See Figure 7 .

[0056] The above is only a preferred embodiment of the present application, and does not limit the structure of the present application in any form. The arrangement type and the number of uses of the present application are not limited to the example, and can be optimized according to the actual engineering. Any modification, equivalent change and decoration of the above embodiment according to the technical principle of the present application, which does not deviate from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. A construction method of a high-intensity area stainless steel-ECC assembly type pier column-foundation node connection structure, the high-intensity area stainless steel-ECC assembly type pier column-foundation node connection structure being composed of a prefabricated concrete pier column (1) and a concrete foundation (2), the prefabricated concrete pier column (1) being inserted into a socket of the concrete foundation (2); the prefabricated concrete pier column (1) comprising an upper ordinary concrete pier column and a lower ECC concrete pier column, the upper ordinary concrete pier column comprising pier body longitudinal ordinary steel bars (4) and pier body ordinary stirrups (3) wrapped and cast together by ordinary concrete; the lower ECC concrete pier column comprising pier body longitudinal stainless steel bars (8), pier body longitudinal high-strength stainless steel bars (7), embedded grouting sleeves (14), embedded grouting pipes (13), embedded grouting-out pipes (20), and pier body FRP stirrups (18) wrapped and cast together by ECC concrete (6); the pier body longitudinal stainless steel bars (8) and the pier body longitudinal high-strength stainless steel bars (7) are vertically and correspondingly connected together with the pier body longitudinal ordinary steel bars (4) through steel bar connectors (5); the lower end of the pier body longitudinal high-strength stainless steel bars (7) is inserted into the embedded grouting sleeves (14); the embedded grouting sleeves (14) are embedded at the bottom of the prefabricated concrete pier column (1), and the sidewalls of the embedded grouting sleeves (14) are connected with the embedded grouting pipes (13) and the embedded grouting-out pipes (20) extending to the surface of the concrete pier column (1); the concrete foundation (2) further comprises foundation longitudinal steel bars (12), foundation stirrups (16), and foundation reserved high-strength stainless steel bars (15); the foundation stirrups (16) are arranged around the socket, penetrate through the middle part of the concrete foundation (2), and overlap with the foundation longitudinal steel bars (12); the foundation reserved high-strength stainless steel bars (15) are located at the bottom of the socket of the concrete foundation (2), the top of the foundation reserved high-strength stainless steel bars (15) extends out of the socket and is correspondingly connected with the pier body longitudinal high-strength stainless steel bars (7) through the embedded grouting sleeves (14), and the lower end of the foundation reserved high-strength stainless steel bars (15) is anchored with the foundation longitudinal steel bars (12); the inner wall of the socket of the concrete foundation (2) and the sidewall of the bottom of the prefabricated concrete pier column (1) are filled with high-strength concrete UHPC (11); characterized in that comprising the following steps: S1, binding the pier body longitudinal ordinary steel bars (4) and the pier body ordinary stirrups (3) in a factory; after the binding of the pier body longitudinal ordinary steel bars (4) and the pier body ordinary stirrups (3) is completed, a steel bar net rack is formed, a formwork is supported, ordinary concrete is cast, a test piece is maintained, the formwork is removed, and the manufacture of the upper part of the pier column is completed; then, the steel bar connectors (5) are installed at the ends of the reserved pier body longitudinal ordinary steel bars (4), the pier body longitudinal stainless steel bars (8) and the pier body longitudinal high-strength stainless steel bars (7) are connected with the pier body longitudinal ordinary steel bars (4) through the steel bar connectors (5), the pier body FRP stirrups (18), the embedded grouting sleeves (14), the embedded grouting pipes (13), and the embedded grouting-out pipes (20) are bound again, a steel bar net rack of the lower part of the pier column is formed, a formwork is supported, ECC concrete is cast, a test piece is maintained, the formwork is removed, and the manufacture of the prefabricated concrete pier column (1) is completed. S2, binding the base longitudinal reinforcement (12) and the base stirrup (16) of the concrete foundation (2) on site, reserving the socket for placing the prefabricated concrete pier column (1), reserving and accurately positioning the base reserved high-strength stainless steel bar (15), finally supporting the formwork, pouring concrete, and completing the prefabrication of the concrete foundation (2); S3, the prefabricated concrete pier column (1) is transported to the construction site, a 10-30mm bedding layer (17) is laid on the bottom surface of the concrete foundation (2) socket, the base reserved high-strength stainless steel bar (15) extending out of the concrete foundation (2) socket is inserted into the pre-buried grouting sleeve (14) of the prefabricated concrete pier column (1), the levelness and perpendicularity of the prefabricated concrete pier column (1) are adjusted, and the placement of the prefabricated concrete pier column (1) is completed; S4, high-strength concrete UHPC (11) is mixed on site, high-strength concrete UHPC (11) is injected into the pre-buried grouting pipe (13) using a high-pressure grouting device, high-strength concrete UHPC (11) is injected into the pre-buried grouting sleeve (14) through the pre-buried grouting pipe (13) using the pressure grouting method, until the high-strength concrete UHPC (11) overflows from the pre-buried grouting outlet (10), ensuring that the high-strength concrete UHPC (11) in the pre-buried grouting sleeve (14) is full; high-strength concrete UHPC (11) is injected between the bottom side wall of the prefabricated concrete pier column (1) and the inner wall of the concrete foundation (2) socket, so that the prefabricated concrete pier column (1) and the concrete foundation (2) are connected into a whole, and the assembly of the prefabricated concrete pier column (1) and the concrete foundation (2) is completed; Wherein, the length of the base reserved high-strength stainless steel bar (15) inserted into the pre-buried grouting sleeve (14) is not less than 5 times the diameter of the base reserved high-strength stainless steel bar (15); the diameter of the pre-buried grouting sleeve (14) is not less than 2-3 times the diameter of the pier longitudinal high-strength stainless steel bar (7); the number of the base reserved high-strength stainless steel bar (15) is 1 / 2-1 / 4 times the number of the pier longitudinal ordinary steel bar (4); the socket depth of the prefabricated concrete pier column (1) is not less than 0.6 times the diameter of the prefabricated concrete pier column (1).

2. The construction method according to claim 1, characterized in that: The lengths of the pier longitudinal ordinary steel bar (4), the pier longitudinal stainless steel bar (8), and the pier longitudinal high-strength stainless steel bar (7) inserted into the steel bar connector (5) are all not less than 3 times the diameter of the pier longitudinal stainless steel bar (8).

3. The construction method according to claim 1, characterized in that: The thickness of the steel bar connector (5) is not less than 2mm.

4. The construction method according to claim 1, characterized in that: The compressive strength of the high-strength concrete UHPC (11) is not less than 120MPa, and the tensile strength is not less than 10MPa.

5. The method of construction according to claim 1, wherein: The inner diameter of the pre-buried grouting sleeve (14) is 20-40mm larger than the pier longitudinal high-strength stainless steel bar (7), and the thickness is not less than 2mm; the inner diameter of the pre-buried grouting pipe (13) and the pre-buried grouting pipe (20) is 20-40mm, and the wall thickness is not less than 0.5mm.

6. The method of construction according to claim 5, wherein: The pre-embedded grouting pipe (13) and the pre-embedded out-grouting pipe (20) are connected to the bottom and the top of the pre-embedded grouting sleeve (14) respectively; the pre-embedded grouting sleeves (14) are evenly arranged on the circumference of the lower ECC concrete pier column cross section and are provided with multiple pier body longitudinal stainless steel bars (8) at intervals.

7. The method of construction according to claim 1, wherein: A 10-30mm grouting layer (17) is arranged between the bottom surface of the precast concrete pier column (1) and the bottom surface of the concrete foundation (2) socket groove.

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