Assembly type combined pier based on phase change temperature control and multi-dimensional interface interlocking and construction method thereof

Abstract

The invention discloses an assembly type combined pier based on phase change temperature control and multi-dimensional interface interlocking and a construction method thereof. The pier comprises a bearing platform, a prefabricated formwork and core concrete. The prefabricated mold shell is composed of a rigid inner pipe fitting, a composite phase change temperature adjusting layer arranged on the outer wall of the rigid inner pipe fitting and a concrete shell wrapping the outermost layer. The outer wall of the rigid inner pipe fitting is further provided with a rigid anti-shear connecting piece, and the rigid anti-shear connecting piece penetrates through the composite phase change temperature adjusting layer and extends into the concrete shell. The heat absorption melting and heat release solidification mechanism of the composite phase change temperature adjusting layer is utilized, active peak clipping and valley filling of core concrete hydration heat are achieved, and temperature difference cracking of the formwork is effectively prevented; and meanwhile, by means of the shear-resistant bolt pins formed between the rigid shear-resistant connecting pieces and the concrete shell, the interface shear-resistant capacity and the overall cooperative stress performance of the steel pipe and the concrete shell are remarkably improved, and the structure is suitable for rapid construction in high-intensity earthquake areas and areas with large cold temperature differences.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a prefabricated composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking, and its construction method. Background Technology

[0002] Precast assembly bridge pier technology is an important direction for promoting the industrialization and green development of bridge construction. Among them, precast concrete shell bridge piers, as an advanced technology, involve prefabricating a hollow concrete shell (i.e., the shell) in a factory, transporting it to the site for hoisting and placement, and then pouring core concrete into the cavity to form the integral pier body. This technology has significant advantages such as controllable quality of precast components, fast on-site construction speed, no need for formwork removal, and excellent curing conditions.

[0003] However, this technology faces two major technical bottlenecks in engineering practice, which restrict its widespread application in high-performance bridges, especially in harsh environments (such as high-intensity earthquake zones and areas with large temperature differences): 1. Cracking of the formwork due to heat of hydration: The core concrete poured on-site releases a large amount of heat of hydration during the curing process, which can easily lead to heat-induced cracking of the formwork and reduced corrosion resistance. In engineering, methods such as pre-embedded cooling pipes and the use of low-heat cement-based materials are commonly used to reduce the impact of heat of hydration. However, these methods have drawbacks such as insufficient early strength of the materials and difficulty in construction control, making it difficult to completely eliminate the impact of heat of hydration. When the core concrete releases intense heat of hydration during large-volume pouring, the heat accumulates internally and cannot be effectively controlled, easily leading to a huge temperature gradient between the formwork and the core concrete. This creates a large temperature gradient and tensile stress on the inner and outer surfaces of the formwork, which can easily cause temperature difference cracks in the concrete shell, seriously damaging the durability and appearance of the structure.

[0004] 2. Insufficient overall integrity due to weak steel-concrete interface connection: To enhance the load-bearing performance of the formwork, a steel frame (such as steel pipes) is often installed internally. Traditional connection methods mostly use cylindrical head studs welded to the surface of the steel pipes. However, studs are "point-type" flexible connections with limited shear stiffness, and stress concentration easily occurs at the root under load. Under repeated loading (such as earthquakes and vehicle impacts), the interface is prone to slippage or even local crushing and peeling of the concrete, resulting in the steel pipe and concrete shell not being able to work together fully. The overall structural integrity, energy dissipation capacity, and seismic ductility are difficult to meet high-performance requirements.

[0005] In summary, in high-intensity earthquake zones and areas with large temperature differences, existing prefabricated bridge pier technologies still have significant shortcomings in both temperature crack control and interface connection reliability. There is a lack of an integrated solution that can simultaneously achieve active temperature control for crack prevention and high-strength interface interlocking. Therefore, there is an urgent need to develop a new type of prefabricated composite bridge pier structure and its construction method to improve its durability, integrity, and construction adaptability in complex environments. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes a prefabricated composite bridge pier and its construction method based on phase change temperature control and multi-dimensional interface interlocking. This invention utilizes the endothermic melting and exothermic solidification mechanism of the composite phase change temperature-regulating layer to actively reduce the peak and fill the valley of hydration heat in the core concrete, effectively preventing temperature difference cracking of the formwork. Simultaneously, the use of rigid shear connectors and shear pins formed between the rigid shear connectors and the concrete shell significantly improves the interfacial shear capacity and overall synergistic stress performance between the steel pipe and the concrete shell, making it suitable for rapid construction in high-intensity earthquake zones and areas with large cold temperature differences.

[0007] To achieve the above-mentioned technical objectives, the technical solution of the present invention is as follows: A prefabricated composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking includes: platform; The pier body is set on the pier platform. The pier body includes a precast mold shell and core concrete poured into the cavity of the precast mold shell. The precast mold shell includes, from the inside to the outside, a rigid inner tube, a composite phase change temperature regulating layer and a concrete outer shell. Several arrayed rigid shear connectors are fixed on the outer wall of the rigid inner tube. The rigid shear connectors pass through the composite phase change temperature regulating layer. The rigid shear connectors have several through holes. The concrete of the concrete shell can fill the through holes to form shear pins, so that the rigid inner tube and the concrete shell form a mechanical interlock. The concrete shell contains a reinforcing cage, which, together with the rigid shear connector and the shear pin formed therefrom, forms the reinforcing skeleton of the concrete shell. The upper end of the vertical connecting steel bar of the mold shell steel cage extends out of the top surface of the precast mold shell and is grouted to the top cap; the lower end of the vertical connecting steel bar extends out of the bottom surface of the precast mold shell and is grouted to the foundation. The composite phase change temperature regulating layer contains phase change energy storage material, which is used to regulate the hydration heat temperature field during the curing process of the core concrete through the latent heat of phase change, and to prevent the precast mold shell from cracking due to temperature difference.

[0008] Beneficial effects: 1. Active Temperature Control and Crack Prevention: Unlike the passive barrier of traditional thermal insulation coatings, this invention coats a phase change energy storage material between the rigid inner pipe and the PBL perforated steel plate. This material actively regulates the temperature field during the hydration heat reaction process of the core concrete, keeping the temperature difference within a safe range. This phase change temperature regulating layer has the following characteristics: (1) Heat absorption and peak reduction: When the temperature of the core concrete rises to the phase change temperature after the core concrete is poured, the phase change energy storage material changes from solid to liquid, absorbs a large amount of latent heat, and thus significantly reduces the peak temperature of the core concrete.

[0009] (2) Heat release and valley filling: When the temperature decreases, the phase change energy storage material solidifies and releases heat, slowing down the cooling rate. This active temperature control mechanism of "peak shaving and valley filling" solves the problem of temperature difference cracking of the mold shell from the root.

[0010] 2. Highly efficient construction: The precast formwork of this invention has three functions: formwork, load-bearing component and temperature control layer. It does not require demolding, the on-site process is simple, and it meets the needs of rapid construction.

[0011] 3. By utilizing the shear pins formed between the rigid shear connector and the concrete shell, the interfacial shear capacity and overall synergistic stress performance of the steel pipe and the concrete shell are significantly improved, making it suitable for rapid construction in high-intensity earthquake zones and areas with large temperature differences.

[0012] Furthermore, the rigid shear-resistant connector is a PBL perforated steel plate, which extends outward from the outer wall of the rigid inner tube and passes through the composite phase change temperature regulating layer. The PBL perforated steel plate has several through holes.

[0013] Beneficial effects: The use of PBL perforated steel plates to replace traditional welded studs increases the contact area of ​​the steel-concrete interface and achieves mechanical interlocking by utilizing the concrete pin effect, which significantly improves the shear bearing capacity and seismic ductility of the bridge piers.

[0014] Furthermore, the diameter of the through hole is 30mm-50mm, and the hole spacing is 100mm-200mm.

[0015] Furthermore, the PBL perforated steel plates are arranged in an axial and / or circumferential array along the rigid inner tube.

[0016] Furthermore, the composite phase change temperature regulating layer includes a phase change energy storage material, and its phase change temperature is set between 45°C and 60°C.

[0017] Furthermore, the composite phase change temperature regulating layer is a composite material coating, which is formed by spraying a slurry containing phase change energy storage material onto the outer wall of the rigid inner tube.

[0018] Beneficial effects: The present invention uses a thinner spray coating, resulting in a uniform surface and minimal impact on the adhesion properties of the concrete formwork and rigid inner pipes.

[0019] Furthermore, the phase change energy storage material is a microcapsule encapsulating a solid-liquid phase change energy storage material, dispersed in a binder matrix material.

[0020] Beneficial effects: Microcapsules are tiny containers, typically 1-1000 micrometers in diameter, encapsulating a core material such as a solid, liquid, or gas using natural or synthetic polymers as wall materials. Microcapsules can encapsulate liquids and solids, maintaining their shape and phase on a macroscopic scale. Even when the internal phase change material melts upon heating, they do not flow, thus providing sustained active temperature control.

[0021] Furthermore, the bearing platform is provided with an installation groove and a corrugated pipe grouting hole; the bottom end of the rigid inner pipe extends out of the concrete shell and is inserted into the installation groove.

[0022] Furthermore, the space between the rigid inner tube insertion portion of the bearing platform and the mounting groove is filled with a highly ductile buffer material or grout.

[0023] This invention further discloses a construction method for prefabricated composite bridge piers based on phase change temperature control and multi-dimensional interface interlocking, comprising the following steps: Precast formwork construction process: The rigid shear-resistant connector is fixedly connected to the outer surface of the rigid inner pipe, and the composite phase change temperature regulating layer is sprayed to fully cover the outer surface of the steel pipe. The steel reinforcement cage of the formwork is tied to the outside of the rigid inner pipe, and the concrete formwork of the formwork is constructed. A concrete outer shell is poured to create a prefabricated mold shell with active temperature control function; Precast cap construction process: Tie the top cap steel cage, place the corrugated pipe, and fill the grouting holes in the top cap corrugated pipe; Construction of the roof formwork, and pouring of the roof concrete; On-site construction process: Tie the foundation steel reinforcement cage, place the corrugated pipe, and reserve grouting holes for the foundation corrugated pipe; pre-embed connecting steel bars in the groove and reserve the groove; Construction of the foundation formwork, and pouring of the foundation concrete; After the foundation reaches the design strength, the precast formwork is hoisted to align the rigid inner pipe with the reserved groove, and the bottom extension of the vertical connecting steel bars of the formwork steel cage is aligned with the grouting hole of the corrugated pipe of the foundation. Install temporary construction auxiliary tools and fix the precast formwork; Wet concrete joints are poured in the grooves and gaps, grouting material is filled into the grouting holes of the corrugated pipes of the foundation, and then the core concrete of the cavity is poured. When the temperature of the core concrete rises to the phase change temperature after pouring, the phase change energy storage material changes from solid to liquid, absorbs latent heat, and thus reduces the peak temperature of the core concrete. When the temperature drops, the phase change energy storage material solidifies and releases heat, slowing down the cooling rate to protect the concrete shell from cracking. Hoist the top cap so that the upper extension of the vertical connecting steel bar is aligned with the grouting hole of the top cap corrugated pipe, and fill the grouting hole of the top cap corrugated pipe with grout. Once the core concrete and the top cap grouting material have reached their designed strength, the temporary construction auxiliary equipment will be removed. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a partial three-dimensional schematic diagram of the overall structure of the present invention; Figure 3 This is a structural schematic diagram of the rigid inner tube and PBL connector of the present invention; Figure 4 This is a schematic diagram of the working principle of the composite phase change temperature regulating layer of the present invention; Figure 5 This is a perspective view of the prefabricated mold shell of the present invention; Figure 6 This is a schematic diagram of the support structure of the present invention; Figure 7 This is a construction flowchart of the present invention.

[0025] The markings in the diagram are: 1. Concrete outer shell; 2. Rigid inner pipe; 3. PBL perforated steel plate; 4. Composite phase change temperature regulating layer; 5. Reinforcing cage of the formwork; 6. Core concrete; 7. Top cap; 8. Grouting hole of corrugated pipe in top cap; 9. Foundation; 10. Upper extension of vertical connecting reinforcement; 11. Bottom extension of vertical connecting reinforcement; 12. Grouting hole of corrugated pipe in foundation; 13. Installation groove; 14. Pre-embedded connecting reinforcement in groove. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] like Figures 1 to 7As shown, a precast concrete formwork bridge pier with an embedded heat-insulating steel pipe includes a pier cap 9 and a top cap 7. The pier cap 9 is precast with an installation groove 13 and a corrugated pipe grouting hole 12, which is connected to the pier body through the grouting corrugated pipe. The top cap 7 is precast with a top cap corrugated pipe grouting hole 8, which is connected to the pier body through the grouting corrugated pipe.

[0029] The pier body includes a precast mold shell and core concrete 6 poured into the cavity of the precast mold shell; the precast mold shell includes, from the inside out, a rigid inner tube 2, a composite phase change temperature regulating layer 4 and a concrete outer shell 1. The core framework of the prefabricated mold shell is a rigid inner tube 2. In this embodiment, the rigid inner tube 2 is used to provide structural support and force transmission path. It can be a metal tube, such as a steel tube or an alloy tube; or it can be a non-metallic tube, such as an FRP tube.

[0030] In this embodiment, a plurality of arrayed PBL perforated steel plates 3 are fixed on the outer wall of the rigid inner tube 2. The PBL perforated steel plates 3 pass through the composite phase change temperature regulating layer, and each PBL perforated steel plate 3 has a plurality of through holes with a diameter of 30mm-50mm and a hole spacing of 100mm-200mm. On the one hand, the use of PBL perforated steel plates to replace traditional weld studs increases the contact area of ​​the steel-concrete interface; on the other hand, the concrete of the concrete shell can fill the through holes to form shear pins, so that the rigid inner tube and the concrete shell form a mechanical interlock, which significantly improves the shear bearing capacity and seismic ductility of the pier.

[0031] A composite phase change temperature-regulating layer 4 with a thickness of 2mm-5mm is sprayed onto the outer wall of the rigid inner tube 2 and the root area of ​​the PBL perforated steel plate 3. This layer is made of paraffin microcapsule-modified epoxy resin coating with a phase change temperature of approximately 50℃. Paraffin microcapsule-modified epoxy resin coating can be used in this invention because there are many types of paraffin, their melting points are similar, and their price is relatively low.

[0032] This invention employs a thin, uniform spray coating, minimizing its impact on the adhesion properties of the concrete formwork and rigid internal pipes. Microcapsules refer to containers that encapsulate a core material, such as a solid, liquid, or gas, using natural or synthetic polymers as wall materials, forming tiny containers typically ranging from 1 to 1000 micrometers in diameter. Microcapsules can encapsulate liquids and solids, maintaining their shape and phase on a macroscopic scale. Even when the internal phase change material melts upon heating, they do not flow, enabling them to sustainably perform active temperature control.

[0033] Unlike the passive barrier provided by traditional thermal insulation coatings, this invention coats a phase change energy storage material between the rigid inner pipe and the PBL perforated steel plate. This material actively regulates the temperature field during the hydration heat reaction process of the core concrete, keeping the temperature difference within a safe range. This phase change temperature regulating layer has the following characteristics: (1) Heat absorption and peak reduction: When the temperature of the core concrete rises to the phase change temperature after the core concrete is poured, the phase change energy storage material changes from solid to liquid, absorbs a large amount of latent heat, and thus significantly reduces the peak temperature of the core concrete.

[0034] (2) Heat release and valley filling: When the temperature decreases, the phase change energy storage material solidifies and releases heat, slowing down the cooling rate. This active temperature control mechanism of "peak shaving and valley filling" solves the problem of temperature difference cracking of the mold shell from the root.

[0035] Highly efficient construction: The precast formwork of this invention has three functions: formwork, load-bearing component and temperature control layer. It does not require demolding, the on-site process is simple, and it meets the needs of rapid construction.

[0036] A reinforcing cage 5 is embedded in the concrete shell 1. It may be, but is not limited to, using HRB400 steel bars with a diameter of 8mm and a spacing of 100mm, and the outer protective layer thickness shall not be less than 30mm. Specifically, the reinforcing cage 5 surrounds the entire concrete shell 1 and is embedded outside the rigid inner pipe 2 and inside the through hole of the PBL perforated steel plate 3.

[0037] Specifically, the vertical connecting steel bars in the formwork steel cage 5 extend out of the concrete shell 1 at the four corners and the midpoint of the long side, and are aligned with the grouting holes 12 of the corrugated pipe of the foundation and the grouting holes 8 of the corrugated pipe of the top cap.

[0038] Specifically, the vertical connecting bars in the formwork steel cage 5 are densified at the four corners and the midpoint of the long side of the concrete shell 1 to ensure reliable connection with the grouting of the pier cap and the corrugated pipe of the top cap.

[0039] like Figure 6 As shown, the length of the rigid inner tube 2 extending out of the bottom of the concrete outer shell 1 in the precast mold shell is equivalent to the depth of the installation groove 13 in the foundation 9.

[0040] The foundation 9 includes a corrugated pipe grouting hole 12, an installation groove 13, and a groove pre-embedded connecting steel bar 14.

[0041] Specifically, the depth of the mounting groove 13 may be, but is not limited to, 50cm, and the diameter of the mounting groove 13 is slightly larger than the diameter of the rigid inner pipe 2 by 10cm to facilitate hoisting and alignment. The gaps are filled with concrete of a higher grade.

[0042] Specifically, the groove pre-embedded connecting steel bar 14 extends out of the top surface of the foundation 9, and the extension height can be, but is not limited to, 25cm.

[0043] Specifically, the distance between the pre-embedded connecting steel bar 14 in the groove and the edge of the installation groove 13 is greater than or equal to 10cm to prevent conflict with the position of the steel pipe and affect the installation of the precast mold shell.

[0044] Specifically, the corrugated pipe grouting hole 12 of the foundation is formed in the corrugated pipe pre-embedded in the foundation, and the depth can be, but is not limited to, 100cm.

[0045] The specific construction process for the precast formwork in this example is as follows: PBL perforated steel plate 3 is welded onto the rigid inner tube 2, and a composite phase change temperature regulating layer 4 is sprayed on to cover the entire surface. The steel reinforcement cage 5 of the formwork is tied to the outside of the rigid inner pipe, and the concrete formwork of the formwork is constructed. Pour concrete shell 1 to create a precast mold shell with active temperature control function.

[0046] The specific construction process for the prefabricated roof cap in this example is as follows: Tie the top cap 7 steel reinforcement cage, place the corrugated pipe, and reserve the top cap corrugated pipe grouting hole 8; The formwork for the top cap 7 was constructed, and the concrete for the top cap 7 was poured.

[0047] The specific on-site construction process in this example is as follows: Tie the reinforcing cage of the foundation 9, place the corrugated pipe, and reserve the grouting hole 12 for the corrugated pipe of the foundation; tie the groove to pre-embed the connecting reinforcing bar 14, and reserve the installation groove 13. Construction of foundation 9 formwork, pouring foundation 9 concrete; After the foundation 9 reaches the design strength, the precast mold shell is hoisted to align the rigid inner pipe 2 with the installation groove, and the bottom extension section 11 of the vertical connecting steel bar is aligned with the grouting hole 12 of the corrugated pipe of the foundation. Install temporary construction auxiliary tools and fix the precast formwork; Concrete wet joints are poured in the gap of the installation groove 13, grouting material is filled in the grouting hole 12 of the corrugated pipe of the foundation, and core concrete 6 is poured; at this time, the composite phase change temperature regulating layer 4 starts to work, absorbs the heat of hydration, and protects the shell from cracking. Hoist the top cap 7 so that the upper extension section 10 of the vertical connecting steel bar is aligned with the grouting hole 8 of the top cap corrugated pipe, and fill the grouting hole 8 of the top cap corrugated pipe with grouting material. Once the core concrete 6 and the top cap grouting material have reached their designed strength, the temporary construction auxiliary equipment will be removed.

[0048] This embodiment achieves high performance and long service life for prefabricated bridge piers through dual innovation in materials and structure.

[0049] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0050] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A prefabricated combined pier based on phase change temperature control and multi-dimensional interface interlocking, comprising: a pile cap (9) ; a pier body arranged on the pile cap, characterized in that the pier body comprises a prefabricated formwork and a core concrete (6) poured into the cavity of the prefabricated formwork; the prefabricated formwork comprises, in sequence from inside to outside, a rigid inner tube (2), a composite phase change temperature regulating layer (4) and a concrete shell (1) ; a plurality of arrayed rigid shear connectors are fixed on the outer wall of the rigid inner tube (2), the rigid shear connectors pass through the composite phase change temperature regulating layer (4), the rigid shear connectors are provided with a plurality of through holes, and the concrete of the concrete shell can fill the through holes to form shear pins, so that the rigid inner tube (2) and the concrete shell are mechanically interlocked; a formwork reinforcement cage (5) is embedded in the concrete shell, and the formwork reinforcement cage (5), the rigid shear connectors and the shear pins formed by the rigid shear connectors are combined to jointly constitute a reinforcing framework of the concrete shell; the upper end of the vertical connecting reinforcement of the formwork reinforcement cage (5) extends out of the top surface of the prefabricated formwork (1) and is connected to the top hat (7) by grouting, and the bottom end of the vertical connecting reinforcement extends out of the bottom surface of the prefabricated formwork (1) and is connected to the pile cap (9) by grouting; the composite phase change temperature regulating layer (4) contains phase change energy storage materials, which are used to regulate the hydration heat temperature field in the curing process of the core concrete (6) through phase change latent heat, so as to prevent temperature difference cracking of the prefabricated formwork. The rigid shear connector is a PBL perforated steel plate (3), which extends outward from the outer wall of the rigid inner tube (2) and passes through the composite phase change temperature regulating layer (4), and a plurality of through holes are formed in the PBL perforated steel plate. The diameter of the through hole is 30mm-50mm, and the hole distance is 100mm-200mm. The PBL perforated steel plate (3) is arranged in an array along the axial direction and / or the circumferential direction of the rigid inner tube (2). The composite phase change temperature regulating layer (4) contains phase change energy storage materials, and the phase change temperature is set to 45℃-60℃. The composite phase change temperature regulating layer (4) is a composite material coating formed by spraying a slurry containing phase change energy storage materials on the outer wall of the rigid inner tube (2). The phase change energy storage materials are microcapsules containing solid-liquid phase change energy storage materials, which are dispersed in a bonding matrix material.

2. The assembled composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 1, characterized in that, The pile cap (9) is provided with a mounting groove (13) and a pile cap corrugated pipe grouting hole (12) ; the bottom end of the rigid inner tube (2) extends out of the concrete shell and is inserted into the mounting groove (13).

3. The assembled composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 2, characterized in that, High-ductility cushioning materials or grouting materials are filled between the inserted pile cap part of the rigid inner tube (2) and the mounting groove (13).

4. The assembled composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 2, characterized in that, The steps include:

5. The assembled composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 1, characterized in that, Prefabricated formwork construction process:

6. The assembled combination bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 1, characterized in that, The rigid shear connectors are fixed on the outer surface of the rigid inner tube (2), and the composite phase change temperature regulating layer (4) is sprayed on the outer surface of the steel tube to form a full covering; 7. The assembled composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 6, characterized in that, The formwork reinforcement cage (5) is bound on the outer side of the rigid inner tube (2), and a formwork concrete template is constructed; 8. The assembled composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 1, characterized in that, The concrete shell (1) is poured to form a prefabricated formwork with active temperature control function; 9. The assembled composite bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to claim 1, characterized in that, Prefabricated top hat construction process: 10.A construction method of a fabricated combined bridge pier based on phase change temperature control and multi-dimensional interface interlocking, the fabricated combined bridge pier based on phase change temperature control and multi-dimensional interface interlocking being any one of the fabricated combined bridge pier based on phase change temperature control and multi-dimensional interface interlocking according to any one of claims 1 to 9, characterized in that, ​ ​ ​ ​ ​ ​ Bundling the reinforcement cage of the top hat (7), placing the corrugated pipe, and grouting the corrugated pipe grouting hole (8) of the top hat; Constructing the formwork of the top hat (7) and pouring the concrete of the top hat (7); Construction process on site: Bundling the reinforcement cage of the pile cap (9), placing the corrugated pipe, and reserving the corrugated pipe grouting hole (12) of the pile cap; embedding the connecting reinforcement (14) in the groove and reserving the groove (13); Constructing the formwork of the pile cap (9) and pouring the concrete of the pile cap (9); After the pile cap (9) reaches the design strength, hoisting the prefabricated formwork, centering the rigid inner pipe fitting (2) with the reserved groove, and centering the bottom end of the vertical connecting reinforcement of the formwork reinforcement cage (5) with the corrugated pipe grouting hole (12) of the pile cap; Installing the temporary construction auxiliary tooling and fixing the prefabricated formwork; Pouring the concrete wet joint in the gap of the groove (9), filling the grouting material in the corrugated pipe grouting hole (12) of the pile cap, and pouring the core concrete (6) of the cavity; when the temperature of the core concrete rises to the phase change temperature after pouring, the phase change energy storage material changes from solid to liquid, absorbs latent heat, and thus reduces the peak temperature of the core concrete; when the temperature decreases, the phase change energy storage material solidifies and releases heat, slowing down the cooling rate to protect the concrete shell from cracking; Hoisting the top hat (7), centering the upper end of the vertical connecting reinforcement (10) with the corrugated pipe grouting hole (8) of the top hat, and filling the grouting material in the corrugated pipe grouting hole (8) of the top hat; After the core concrete (6) and the grouting material of the top hat reach the design strength, the temporary construction auxiliary tooling is removed.

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