A construction and disassembly method for a removable UHPC mounting foundation.

Abstract

This invention discloses a construction and dismantling method for a detachable UHPC installation foundation, relating to the field of power facilities, comprising the following steps: S101, UHPC prefabricated segments have vertical channels, and multiple shape memory alloys with protruding portions are pre-embedded within the UHPC prefabricated segments; S102, multiple UHPC prefabricated segments are assembled on-site, with the vertical channels aligned to form a vertical through cavity; S103, longitudinal reinforcing ribs are inserted into the vertical through cavity; S104, filling grout is injected into the vertical through cavity; S105, after the filling grout solidifies, a filler body is formed, which covers the longitudinal reinforcing ribs and forms a mechanical interlocking structure with the protruding portions of the shape memory alloys; wherein, the filler body is constructed such that its compressive strength decreases to less than 10 MPa when heated to the trigger temperature, and the shape memory alloys are constructed such that they generate radial shrinkage displacement when heated to the trigger temperature. The UHPC installation foundation constructed by this invention is easy to dismantle, and its prefabricated segments are easy to transport and recycle.

Description

Technical Field

[0001] This invention relates to the field of power facilities, and more specifically to a construction method and a dismantling method for a detachable UHPC installation foundation. Background Technology

[0002] The complex terrain and inconvenient transportation in mountainous areas pose challenges to the construction of facilities such as power transmission towers. Concrete foundations are load-bearing structures used to fix and support ground-based power facilities, ensuring the safe and stable operation of transmission lines. Traditional cast-in-place concrete foundations require transporting large quantities of cement, aggregates, water, and formwork to the site, followed by large-scale excavation and wet pouring, resulting in a series of drawbacks such as long construction cycles, high overall costs, and severe damage to native vegetation and soil structure. Furthermore, organizing such construction on steep and rugged sites also carries significant safety risks.

[0003] To overcome the aforementioned drawbacks of traditional concrete foundations, segmented precast foundations have emerged. Segmented precast foundations involve manufacturing multiple precast segments in a factory, transporting them to the site, and then rapidly assembling them using mechanized hoisting. This reduces reliance on on-site materials and wet work, and minimizes environmental impact. However, to ensure the assembled concrete foundation can function as a cohesive whole, current technology typically involves pre-drilling through-holes in the precast segments. After on-site assembly, reinforcing bars are inserted into these holes, and concrete or high-strength mortar is poured in to connect them.

[0004] While this approach improves efficiency and environmental friendliness during the construction phase, dismantling these concrete foundations is extremely difficult when power facilities need to be relocated or reach the end of their service life. The bond between the reinforcing steel and the grouting material, as well as the adhesion between the grouting material and the walls of the precast segment holes, together form an extremely strong connection. Demolition using traditional mechanical crushing or blasting methods generates enormous noise and vibration, inevitably damaging the precast segments and reinforcing steel, rendering them completely unrecyclable. This "build but don't dismantle, dismantle and it's ruined" model results in serious resource waste and environmental pollution, running counter to the concept of sustainable development. Summary of the Invention

[0005] This invention aims to address, to a certain extent, one of the technical problems in related technologies. To this end, this invention provides a construction method and a dismantling method for a detachable UHPC installation foundation. The constructed UHPC installation foundation is easy to dismantle, and its prefabricated segments are easy to transport and recycle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for constructing a removable UHPC mounting base includes the following steps: S101, providing a UHPC prefabricated segment, wherein the UHPC prefabricated segment has at least one vertical channel opened along its axial direction, and a plurality of shape memory alloys are pre-embedded in the UHPC prefabricated segment at intervals along the axial direction, wherein the shape memory alloys have protruding portions protruding from the wall of the vertical channel. S102, multiple UHPC prefabricated segments are assembled on the construction site, and the vertical ducts of the multiple UHPC prefabricated segments are aligned to form at least one vertical through cavity; S103, insert the longitudinal reinforcing rib into the vertical through cavity; S104, injecting a filling slurry into the vertical through cavity, the filling slurry comprising UHPC base material and a thermally responsive phase change material dispersed in the UHPC base material; S105, after the filling slurry is cured, a filler body is formed. The filler body covers the longitudinal reinforcing ribs and forms a mechanical interlocking structure with the protruding portion of the shape memory alloy, thereby obtaining the UHPC mounting base; wherein, the filler body is configured such that its compressive strength decreases to less than 10 MPa when the trigger temperature is reached, and the shape memory alloy is configured such that it generates radial contraction displacement to disengage from the mechanical interlocking structure when the trigger temperature is reached.

[0007] In this application, prefabricated UHPC segments, manufactured in a factory, are assembled into an installation foundation on-site using infill and longitudinal reinforcement, enabling rapid transportation and construction of the prefabricated foundation components in mountainous areas. By embedding shape memory alloys in the UHPC segments and adding thermally responsive phase change materials during the grouting process, the final UHPC installation foundation remains a robust whole throughout its service life. The infill, based on UHPC, possesses high strength after curing, and its mechanical interlocking structure with the protruding portions of the shape memory alloy provides ultra-high bonding strength. Upon reaching the trigger temperature, the compressive strength of the infill decreases, and the shape memory alloy shrinks. Both weaken the bond strength with the infill at the trigger temperature, causing the shape memory alloy to disengage from the mechanical interlock with the infill. The dual weakening mechanism of shape memory alloy and thermally responsive phase change material breaks down the connection from the inside of the installation foundation, making it easy to pull out the longitudinal reinforcement and disassemble the UHPC prefabricated segments without the need for blasting and large crushing equipment. It is particularly suitable for mountainous areas or areas with high environmental protection requirements where equipment access is difficult. It realizes the non-destructive recycling and reuse of UHPC prefabricated segments and longitudinal reinforcement, reducing construction waste and raw material consumption.

[0008] Optionally, the shape memory alloy is a ring-shaped component that surrounds the wall of the vertical channel.

[0009] Optionally, the shape memory alloy has a memory state in an austenitic state and a working state in a martensitic state. In the memory state, the shape memory alloy has a first inner diameter; in the working state, the shape memory alloy has a second inner diameter smaller than the first inner diameter. The shape memory alloy is embedded in the UHPC prefabricated segment in the working state and is configured to recover to the memory state when the trigger temperature is reached.

[0010] Optionally, the thermally responsive phase change material is polymethyl methacrylate aggregate, and the particle size of the polymethyl methacrylate aggregate is 1-3 mm.

[0011] Optionally, the trigger temperature range is 160℃~200℃.

[0012] Optionally, the longitudinal reinforcing bars are steel bars.

[0013] Furthermore, the present invention also provides a method for dismantling a detachable UHPC mounting base, wherein the UHPC mounting base is constructed using the aforementioned construction method, and the dismantling method includes the following steps: S201, Heat the UHPC mounting base so that the temperature of the filler and shape memory alloy in the UHPC mounting base reaches the trigger temperature. S202, maintain the trigger temperature for a preset time to reduce the compressive strength of the filler to less than 10MPa, and at the same time cause the shape memory alloy to generate radial shrinkage displacement to disengage from the mechanical interlock with the filler; S203, the longitudinal reinforcing ribs in the UHPC mounting base are pulled out from the vertical through cavity; S204, the longitudinal reinforcing ribs are recycled, and the UHPC mounting base is disassembled into multiple UHPC prefabricated segments for recycling.

[0014] Optionally, in step S201, the heating includes: heating the exposed portion of the UHPC mounting base by wrapping it with a heating blanket, and simultaneously heating the exposed ends of the longitudinal reinforcing ribs with an induction heater.

[0015] Optionally, in step S202, the internal temperature of the UHPC mounting base is raised to 170~190°C within 2 hours and kept at that temperature for 30 minutes.

[0016] Optionally, between steps S202 and S203, the following step is also included: cooling the UHPC mounting base to 60°C.

[0017] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of the present invention will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of the present invention. In addition, each of these features, elements and components appearing in the following text and drawings is a plurality of, and different symbols or numbers are used for convenience of representation, but all represent parts with the same or similar construction or function. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the UHPC installation foundation in this invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a top view of the UHPC mounting base in this invention; Figure 4 This is a schematic diagram illustrating the transformation of the shape memory alloy from its working state to its memory state in this invention.

[0019] Among them, 1. UHPC prefabricated segment; 11. Vertical channel; 12. Shape memory alloy; 121. Protruding part; 2. Vertical through cavity; 3. Longitudinal reinforcing rib; 4. Infill body; D1. Working form; D2. Memory form. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain the present invention and should not be construed as limiting the invention.

[0021] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0022] Example: like Figures 1 to 3 As shown in the figure, this embodiment provides a construction method for a detachable UHPC mounting foundation, including the following steps: S101, a UHPC prefabricated segment 1 is provided. The UHPC prefabricated segment 1 has at least one vertical channel 11 opened along its axial direction. Multiple shape memory alloys 12 are pre-embedded in the UHPC prefabricated segment 1 at intervals along the axial direction. The shape memory alloys 12 have protruding portions 121 protruding from the hole wall of the vertical channel 11. S102, multiple UHPC prefabricated segments 1 are assembled on the construction site, and the vertical ducts 11 of the multiple UHPC prefabricated segments 1 are aligned to form at least one vertical through cavity 2. S103, insert the longitudinal reinforcing rib 3 into the vertical through cavity 2; S104, Inject filling slurry into the vertical through cavity 2. The filling slurry includes UHPC base material and thermally responsive phase change material dispersed in UHPC base material; S105, after the filling slurry is cured, a filler 4 is formed. The filler 4 covers the longitudinal reinforcing ribs 3 and forms a mechanical interlocking structure with the protruding part 121 of the shape memory alloy 12, thus obtaining the UHPC mounting base. The filler 4 is configured such that its compressive strength decreases to less than 10 MPa when heated to the trigger temperature, and the shape memory alloy 12 is configured such that it generates radial contraction displacement when heated to the trigger temperature to disengage from the mechanical interlocking structure.

[0023] In this embodiment, UHPC refers to Ultra-High Performance Concrete, and the UHPC installation foundation is a structure buried underground to support and fix facilities such as power transmission towers on the ground. The construction method first provides a UHPC precast segment 1 cast using a steel mold. The UHPC precast segment 1 has at least one vertical channel 11 along its own axial direction. Specifically, the shape of the vertical channel 11 is designed on the steel mold, and after the UHPC is cast, the vertical channel 11 is formed together with the mold. Multiple shape memory alloys 12 are pre-embedded at intervals along the axial direction of the UHPC precast segment 1 on the inner wall of the vertical channel 11. Specifically, the pre-embedding method is as follows: when the UHPC precast segment 1 is poured, the pre-expanded shape memory alloys 12 are positioned and fixed in the casting steel mold. When fixing the shape memory alloys 12, part of them is embedded in the UHPC grout, and the other part protrudes from the inner wall of the vertical channel 11, so that the shape memory alloys 12 have protruding parts 121 protruding from the wall of the vertical channel 11 to facilitate subsequent interlocking with concrete. After demolding, the high-strength UHPC precast segment 1 is obtained by steam curing. It should be noted that, in order to facilitate the demolding of the shape memory alloys 12 with protruding parts 121 and the UHPC precast segment 1 together, the steel mold can be designed to be detachable, that is, the steel mold is assembled from multiple steel plates in a detachable manner.

[0024] like Figure 3As shown, in this embodiment, the UHPC prefabricated segment 1 is constructed in an arc shape, with each arc-shaped UHPC prefabricated segment 1 having an arc of 60°. Each UHPC prefabricated segment 1 is provided with a vertical channel 11. Multiple arc-shaped UHPC prefabricated segments 1 are transported to construction sites such as mountainous areas. Then, within the construction pit, six segments with an arc of 60° are assembled into a complete ring segment, with prestressed bolts tightened at the joints of adjacent segments to complete the connection. Multiple ring segments are then stacked vertically, aligning the vertical channels 11 of the UHPC prefabricated segments 1 on each ring segment to form a vertically connected cavity 2. Subsequently, longitudinal reinforcing ribs 3 are inserted from top to bottom into the assembled and aligned vertically connected cavity 2. Next, filling grout is injected into the vertically connected cavity 2. This filling grout uses UHPC as the base material and disperses thermally responsive phase change material within the base material. A small immersion vibrator is used to compact the grout during injection. After curing, the longitudinal reinforcing ribs 3 are encased within the filler 4, and the filler 4 and the protruding portion 121 of the shape memory alloy 12 form a robust mechanical interlocking structure. This results in a ring-shaped UHPC installation foundation composed of multiple stacked annular segments. This interlocking structure provides a connection strength higher than that of ordinary grouting materials at room temperature. The filler 4 is configured to soften and melt due to the thermal response phase change material at a specific trigger temperature, reducing its compressive strength to below 10 MPa. The shape memory alloy 12 is configured to undergo significant radial shrinkage at the same trigger temperature; that is, the protruding portion 121 of the shape memory alloy 12 retracts (e.g., volume shrinkage of 8%~15%), shrinking from an expanded shape back to its original form and no longer mechanically interlocking with the filler 4. The shrinkage of the shape memory alloy 12 and the softening of the filler 4 together contribute to their separation. Understandably, after the filler 4 softens, the longitudinal reinforcing ribs 3 can be easily pulled out one by one from the vertical through-cavity 2 using a hydraulic jack. By utilizing a single heat source input, the chemical bond and mechanical interlock between the filler 4 and the shape memory alloy 12 are actively released, achieving easy disassembly and transforming the permanent bonding and interlocking of prefabricated segments in existing technologies into a releasable temporary connection. During disassembly, the longitudinal reinforcing rib 3 can be safely and quickly pulled out, and the complete prefabricated segment can be recovered.

[0025] It should be noted that the inclusion of the shape memory alloy 12 is essential. Even when the filler slurry softens to below 10 MPa, it remains a high-viscosity, semi-solid paste, not a liquid sufficient for flow. Therefore, removing the longitudinal reinforcing rib 3 from the filler slurry requires considerable pulling force, necessitating heavy-duty hydraulic equipment, which is extremely difficult to implement in mountainous areas. When the shape memory alloy 12 shrinks due to heat, it creates a gap between the filler 4 and the vertical channels 11 of the UHPC precast segment 1, thus reducing the contact area between the filler 4 and the vertical channels 11, making the longitudinal reinforcing rib 3 easier to remove.

[0026] In other embodiments, the UHPC prefabricated segment 1 can also be constructed as an arc with an arc of 90° or 30°, or as a straight segment, as long as it can be finally assembled into a ring.

[0027] Specifically, the raw materials for preparing UHPC precast segments 1 may include cement, silica fume, fine aggregate of quartz sand, water-reducing agent, water, and steel fibers.

[0028] The shape memory alloy 12 is a ring-shaped component that surrounds the wall of the vertical channel 11.

[0029] In this embodiment, the shape memory alloy 12 is constructed as a closed ring with a central through-hole, and the material is preferably nickel-titanium alloy. The vertical channel 11 of the UHPC prefabricated segment 1 is cylindrical, and the ring structure of the shape memory alloy 12 can form a uniform circumferential engagement and constraint with the cylindrical vertical channel 11 and the filler 4. Furthermore, the ring structure of the shape memory alloy 12 can ensure that it can produce uniform, concentric radial contraction when the trigger temperature is reached, thereby completely disengaging from the filler 4. In this embodiment, the shape memory alloy 12 is preferably a ring component made of nickel-titanium (NiTi or NiTiNb) alloy, and its outer surface may be provided with threads or ring ribs to enhance the anchoring with the filler 4.

[0030] The shape memory alloy 12 has a memory state D2 in the austenitic state and a working state D1 in the martensitic state. In the memory state D2, the shape memory alloy 12 has a first inner diameter; in the working state D1, the shape memory alloy 12 has a second inner diameter smaller than the first inner diameter. The shape memory alloy 12 is embedded in the UHPC prefabricated segment 1 in the working state D1 and is configured to recover to the memory state D2 when the trigger temperature is reached.

[0031] In this embodiment, as Figure 4As shown, the toroidal shape memory alloy 12 has two states: memory state D2 and working state D1. When the shape memory alloy 12 is in memory state D2, the alloy material is in the original austenitic state, and its shape is a thin ring with a large inner diameter. After mechanical expansion, the shape memory alloy 12 is in working state D1, and the alloy material is in the martensitic state, and its shape is a thick ring with a smaller inner diameter. "Thick" and "thin" describe the thickness (radial dimension) of the ring itself. It can be understood that after the shape memory alloy 12 shrinks and becomes thinner, the inner diameter of its central through hole will naturally become larger. Since the central through hole of the shape memory alloy 12 is coaxially arranged with the vertical channel 11 of the UHPC prefabricated segment 1, the protruding part 121 protruding from the wall of the vertical channel 11 will no longer exist after the inner diameter of the central through hole of the shape memory alloy 12 becomes larger. Specifically, in the factory prefabrication stage, the shape memory alloy 12 in its memory state D2 is first radially stretched and expanded into a thick ring (working state D1) using mechanical tooling. The alloy material transforms from an austenitic state to a martensitic state and is fixed in the martensitic working state D1 (e.g., using a fixture or through cryogenic freezing). This treated shape memory alloy 12 is then pre-embedded using the aforementioned method. When the shape memory alloy 12 is heated to the trigger temperature, a reverse phase transformation from martensitic to austenitic state occurs, resulting in significant radial contraction and a strong recovery of the original memory state D2 (i.e., a thin ring with an increased inner diameter).

[0032] The thermally responsive phase change material is polymethyl methacrylate aggregate, and the particle size of the polymethyl methacrylate aggregate is 1-3 mm.

[0033] In this embodiment, the polymethyl methacrylate (PMMA) aggregate is constructed as spherical particles with a particle size range of 1–3 mm. When preparing the filler slurry, PMMA aggregate is used to replace 30% of the fine quartz sand aggregate in the UHPC raw material by volume. The applicant's research has shown that this particle size range and replacement ratio ensures that the PMMA aggregate fully softens and melts at the trigger temperature while maintaining the initial strength of the filler 4, thereby disrupting the internal structure of the filler 4 and achieving a sharp drop in strength from approximately 90 MPa to below 10 MPa. During slurry injection, a high-frequency tamping tool is used to ensure compaction. After the filler 4 has cured (it can be cured at room temperature for 7 days or steam-cured), it generates a bond with the longitudinal reinforcing ribs 3 and forms a strong mechanical interlock with the protruding portion 121 of the shape memory alloy 12.

[0034] The trigger temperature range is 160℃~200℃.

[0035] In this embodiment, the trigger temperature is 160℃~200℃. A trigger temperature below 160℃ cannot ensure the softening of the polymethyl methacrylate aggregate, while a trigger temperature above 200℃ will increase energy consumption and may also adversely affect the UHPC and longitudinal reinforcing ribs 3. Preferably, a trigger temperature of 180℃ is sufficient to trigger the dual weakening of the shape memory alloy 12 and the filler 4.

[0036] Longitudinal reinforcing bar 3 is a steel bar.

[0037] In this embodiment, the longitudinal reinforcing ribs 3 within the UHPC mounting base are steel bars. These steel bars can be conventional hot-rolled ribbed steel bars, which are inserted into the vertical ducts 11 and grouted for curing before serving as the main load-bearing components. During disassembly and recycling, the steel bars have extremely high reuse value due to their integrity. In other embodiments, the longitudinal reinforcing ribs 3 can also be reinforcing ribs with built-in heating elements or fiber-reinforced polymer ribs.

[0038] Furthermore, this embodiment also provides a method for dismantling a detachable UHPC mounting base. The detachable UHPC mounting base is constructed using the aforementioned construction method, and the dismantling method includes the following steps: S201, Heat the UHPC mounting base to heat the filler 4 and shape memory alloy 12 in the UHPC mounting base to the trigger temperature. S202, maintain the trigger temperature for a preset time to reduce the compressive strength of filler 4 to less than 10MPa, and at the same time cause shape memory alloy 12 to generate radial contraction displacement to disengage from mechanical interlock with filler 4. S203, pull out the longitudinal reinforcing rib 3 in the UHPC mounting base from the vertical through cavity 2; S204, recover the longitudinal reinforcing rib 3, and disassemble the UHPC mounting base into multiple UHPC prefabricated segments 1 for recycling.

[0039] In this embodiment, when the UHPC mounting base needs to be disassembled and recycled, the installed UHPC mounting base is heated to reach and maintain its internal temperature at the trigger temperature. The thermally responsive phase change material in the filler 4 softens and melts, losing its function as a reinforcing skeleton in the filler 4, thus reducing the strength of the filler 4. Simultaneously, the pre-embedded shape memory alloy 12 undergoes a reverse phase transformation from martensitic to austenitic state at this trigger temperature, shrinking from an expanded and convex working form D1 back to a compact memory form D2. The radial inward contraction displacement generated by this process causes the protruding portion 121 (interlocking portion) of the shape memory alloy 12, which was originally embedded in the filler 4, to actively disengage from the filler 4, reducing the friction between the filler 4 and the vertical channel 11 of the UHPC prefabricated segment 1, and also making it easier to pull out the longitudinal reinforcing rib 3. Subsequently, by using a hydraulic jack or winch to hold the top of the longitudinal reinforcing rib 3, it can be easily pulled out from the weakened vertical through cavity 2. Finally, using hoisting equipment, each UHPC precast segment 1, which has lost its internal longitudinal reinforcing ribs 3, is lifted out of the foundation pit one by one for recycling. The entire dismantling process requires no blasting or large crushing machinery, and is characterized by low noise and minimal dust, making it more environmentally friendly.

[0040] In step S201, heating includes: heating the exposed portion of the UHPC mounting base by wrapping it with a heating blanket, and simultaneously heating the exposed ends of the longitudinal reinforcing ribs 3 using an induction heater.

[0041] In this embodiment, the target installation foundation is first heated as a whole. A combined heating method can be used to ensure efficiency and uniformity. For example, an electric heating blanket can be used to wrap the exposed part of the installation foundation, while an induction heater is used to assist in heating the top of the exposed rebar. The rebar is rapidly heated by the thermal effect of the current, and the good thermal conductivity of the rebar is used to quickly transfer the heat to the interior, ensuring that the trigger temperature can be reached quickly and uniformly inside the large installation foundation. During this process, the annular shape memory alloy 12 shrinks due to heat, and the mechanical interlocking structure formed by the filler 4 and the shape memory alloy 12 disappears.

[0042] In step S202, the internal temperature of the UHPC mounting base is raised to 170~190℃ within 2 hours and kept at that temperature for 30 minutes.

[0043] In this embodiment, the internal temperature can be monitored by placing thermocouples inside the mounting base (such as in filler 4), and the heating power can be controlled to uniformly raise the internal temperature of the mounting base to the target trigger temperature (e.g., 180℃±10℃) within 2 hours. After reaching the target temperature, the system switches to a heat preservation mode and maintains the temperature for 30 minutes. The polymethyl methacrylate aggregate in filler 4 continues to soften and melt, causing the overall strength of filler 4 to decrease; simultaneously, the shape memory alloy 12 connector completes the austenitic phase transformation and generates sufficient radial shrinkage, thereby breaking free from its mechanical interlock with filler 4. Afterward, heating is stopped.

[0044] Between steps S202 and S203, the following step is also included: cooling the UHPC mounting base to 60°C.

[0045] In this embodiment, between steps S202 and S203, i.e. after heating is stopped, natural cooling or forced air cooling can be selected to reduce the installation base temperature to below the safe operating temperature (e.g., 60°C).

[0046] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A construction method for a detachable UHPC mounting foundation, characterized in that, Includes the following steps: S101, providing a UHPC prefabricated segment, wherein the UHPC prefabricated segment has at least one vertical channel opened along its axial direction, and a plurality of shape memory alloys are pre-embedded in the UHPC prefabricated segment at intervals along the axial direction, wherein the shape memory alloys have protruding portions protruding from the wall of the vertical channel. S102, multiple UHPC prefabricated segments are assembled on the construction site, and the vertical ducts of the multiple UHPC prefabricated segments are aligned to form at least one vertical through cavity; S103, insert the longitudinal reinforcing rib into the vertical through cavity; S104, injecting a filling slurry into the vertical through cavity, the filling slurry comprising UHPC base material and a thermally responsive phase change material dispersed in the UHPC base material; S105, after the filling slurry is cured, a filler body is formed. The filler body covers the longitudinal reinforcing ribs and forms a mechanical interlocking structure with the protruding portion of the shape memory alloy, thereby obtaining the UHPC mounting base; wherein, the filler body is configured such that its compressive strength decreases to less than 10 MPa when heated to the trigger temperature, and the shape memory alloy is configured such that it generates radial contraction displacement to disengage from the mechanical interlocking structure when heated to the trigger temperature.

2. The construction method for the detachable UHPC installation foundation according to claim 1, characterized in that, The shape memory alloy is a ring-shaped component that surrounds the wall of the vertical channel.

3. The construction method for the detachable UHPC installation foundation according to claim 2, characterized in that, The shape memory alloy has a memory state in the austenitic state and a working state in the martensitic state. In the memory state, the shape memory alloy has a first inner diameter; in the working state, the shape memory alloy has a second inner diameter smaller than the first inner diameter. The shape memory alloy is embedded in the UHPC prefabricated segment in the working state and is configured to recover to the memory state when the trigger temperature is reached.

4. The construction method for the detachable UHPC installation foundation according to claim 1, characterized in that, The thermally responsive phase change material is polymethyl methacrylate aggregate, and the particle size of the polymethyl methacrylate aggregate is 1-3 mm.

5. The construction method for the detachable UHPC installation foundation according to claim 1, characterized in that, The trigger temperature range is 160℃~200℃.

6. The construction method of the detachable UHPC installation foundation according to claim 1, characterized in that, The longitudinal reinforcing bars are steel bars.

7. A method for disassembling a detachable UHPC mounting base, characterized in that, The UHPC installation foundation is constructed using the construction method described in any one of claims 1 to 6, and the dismantling method includes the following steps: S201, Heat the UHPC mounting base to raise the temperature of the filler and shape memory alloy in the UHPC mounting base to the trigger temperature; S202, maintain the trigger temperature for a preset time to reduce the compressive strength of the filler to less than 10MPa, and at the same time cause the shape memory alloy to generate radial shrinkage displacement to disengage from the mechanical interlock with the filler; S203, the longitudinal reinforcing ribs in the UHPC mounting base are pulled out from the vertical through cavity; S204, the longitudinal reinforcing ribs are recycled, and the UHPC mounting base is disassembled into multiple UHPC prefabricated segments for recycling.

8. The disassembly method for the detachable UHPC mounting base according to claim 7, characterized in that, In step S201, the heating includes: heating the exposed portion of the UHPC mounting base by wrapping it with a heating blanket, and simultaneously heating the exposed ends of the longitudinal reinforcing ribs with an induction heater.

9. The disassembly method for the detachable UHPC mounting base according to claim 7, characterized in that, In step S202, the internal temperature of the UHPC mounting base is raised to 170~190℃ within 2 hours and kept at that temperature for 30 minutes.

10. The disassembly method for the detachable UHPC mounting base according to claim 7, characterized in that, Between steps S202 and S203, the following step is also included: cooling the UHPC mounting base to 60°C.

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