Pile foundation heat regulation and protection system suitable for water-rich frozen soil area and construction method

Abstract

The application discloses a pile foundation heat regulation and protection system and a construction method suitable for a water-rich frozen soil area, which comprises a fixed plate, a plurality of fixed-point heat absorption components and a plurality of suspended heat absorption components, the fixed plate is arranged around the pile foundation in a circumferential direction, the fixed-point heat absorption components are installed below the fixed plate and are arranged around the pile foundation in a circumferential direction, the fixed-point heat absorption components are filled with solid-liquid phase change materials, the solid-liquid phase change materials are melted to absorb heat and cool the pile foundation, the suspended heat absorption components are filled with solid-liquid phase change materials, the solid-liquid phase change materials are melted to absorb heat and cool the water around the pile foundation. The steel reinforcement cage is used to block the lake water, and the three-dimensional cooling system formed by the triple action of the fixed-point heat absorption components and the suspended heat absorption components not only effectively reduces the temperature of the environment where the pile foundation is located and the water around the pile foundation, but also slows down the occurrence of the phenomenon that the surface lake water melts and erodes the frozen soil around the pile, and enhances the stability of the frozen soil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile foundation protection in water-rich permafrost regions, and particularly relates to a pile foundation thermal regulation and coordinated protection system suitable for water-rich permafrost regions and a construction method. BACKGROUND

[0002] In water-rich permafrost regions, due to natural climate warming or thermal disturbance caused by engineering activities, the underground ice layer often melts, the ground surface subsides and accumulates water, forming a thermokarst lake. The temperature of such water body is significantly higher than that of the surrounding permafrost, which will have a continuous and strong thermal erosion effect on the adjacent engineering foundation (such as pile foundation). The bearing capacity of the pile foundation in permafrost regions is highly dependent on the freezing strength (friction resistance) of the pile-soil interface, which can account for more than 80% of the total bearing capacity. The existence of the thermokarst lake will significantly increase the ground temperature around the pile, causing the freezing strength to decrease sharply, and thus causing engineering disasters such as pile foundation settlement and inclination, which seriously threatens the safety of the structure.

[0003] At present, the protection technology for the thermal melting erosion of the pile foundation in water-rich permafrost regions mainly relies on passive thermal insulation or local reinforcement measures. These methods generally have obvious limitations: first, passive thermal insulation materials are prone to aging and failure under long-term freeze-thaw cycles and water-rich environments, and are difficult to effectively block the continuous heat input from the water body; second, the protection measures are often concentrated on the pile foundation itself or its vicinity, and lack active thermal management capability for the surrounding water body, and cannot solve the problem of the heat source; third, the existing structures lack a self-adaptive regulation mechanism for the seasonal and dynamic changes in water temperature, and the protection effect will gradually decrease under the repeated action of freeze-thaw cycles.

[0004] Therefore, it is urgent to develop a new type of pile foundation structure and construction method, which can actively absorb or transfer the heat transferred by the water body of the thermokarst lake, self-adaptively regulate the ground temperature field around the pile, and effectively improve the long-term anti-thermal melting erosion performance and structural stability of the pile foundation in the complex thermal environment of water-rich permafrost regions, so as to overcome the shortcomings of the prior art. SUMMARY

[0005] The present application relates to the technical field of pile foundation protection in water-rich permafrost regions, and particularly relates to a pile foundation thermal regulation and coordinated protection system suitable for water-rich permafrost regions and a construction method.

[0006] Another object of the present application is to provide a construction method of the pile foundation thermal regulation and coordinated protection system.

[0007] The technical scheme adopted to achieve the object of the present application is as follows:

[0008] The application discloses a pile foundation heat regulation and protection system suitable for water-rich frozen soil area.

[0009] Each of the fixed heat absorption components comprises a fixed shell, an elastic member arranged at the bottom of the fixed shell, a lifting plate, a pressure bearing plate and a gravity pressing plate which are slidably arranged in the fixed shell from top to bottom, a fixed phase change cavity is formed between the top of the lifting plate and the fixed shell, the fixed phase change cavity is located above the frozen soil layer and is filled with solid-liquid phase change material, a lifting cavity is formed between the pressure bearing plate and the lifting plate, the fixed phase change cavity is communicated with the lifting cavity, the pressure bearing plate is connected with the gravity pressing plate through a transmission rod, the top of the gravity pressing plate is provided with an annular protrusion, an annular sleeve is slidably arranged on the annular protrusion, an annular plate is slidably arranged in the annular sleeve, the annular plate divides the annular sleeve into an upper cavity and a lower cavity, the upper cavity is an upper extrusion cavity, the lower cavity is a lower extrusion cavity, the lifting rod passes through the pressure bearing plate and is connected with the lifting plate at the top of the annular plate, the elastic member is arranged between the bottom of the gravity pressing plate and the fixed shell, the top of the elastic member is connected with the gravity pressing plate, and a reset cavity is formed between the bottom of the gravity pressing plate and the fixed shell.

[0010] In the technical scheme, the fixed shell is arranged in a protection cylinder, the protection cylinder is arranged on the side wall of the pile foundation through bolts, and adjacent protection cylinders are fixedly connected through bolts.

[0011] In the technical scheme, the suspension heat absorption component comprises a suspension shell, a first extrusion plate and a second extrusion plate which are slidably arranged in the suspension shell, and an air bag arranged at the top of the suspension shell, the upper extrusion cavity is communicated with the air bag, a first extrusion cavity is formed between the suspension shell and the first extrusion plate, a suspension phase change cavity is formed between the first extrusion plate and the second extrusion plate, the suspension phase change cavity is filled with solid-liquid phase change material, a second extrusion cavity is formed between the second extrusion plate and the suspension shell, the first extrusion cavity is communicated with the lower extrusion cavity, and the second extrusion cavity is communicated with the reset cavity.

[0012] In the technical scheme, a steel cage is welded on the side wall of the fixed plate, the steel cage is filled with concrete and sandstone, and the bottom of the steel cage is in contact with the upper limit of the frozen soil.

[0013] In the technical scheme, the steel reinforcement cage top is hinged with a suspension net, and the suspension shell is embedded in the suspension net.

[0014] In the technical scheme, the protection cylinder is installed below the fixed plate.

[0015] In the technical scheme, vertical through holes are formed in the lifting plate to communicate the fixed-point phase change cavity with the lifting cavity.

[0016] In the technical scheme, the fixed plate is located above the ground surface to reserve sufficient height for installation of the steel reinforcement cage.

[0017] Another aspect of the present application further includes a cooling method of the pile foundation thermal regulation and protection system suitable for water-rich permafrost regions, which comprises the following steps:

[0018] When the underground ice layer melts, the ground surface subsides and accumulates water to form a hot melt lake, in the process of temperature rise of the lake water, the solid-liquid phase change material in the suspension phase change cavity melts from solid to liquid, absorbs heat in the water body, and the temperature of the water body around the pile foundation is reduced; at the same time, the solid-liquid phase change material in the fixed-point phase change cavity melts from solid to liquid, enters the lifting cavity from the fixed-point phase change cavity through the through hole, extrudes the pressure bearing plate, so that the pressure bearing plate is pressed downward by the gravity to move the reset cavity, the gas in the reset cavity is extruded to the second extrusion cavity, the gas in the second extrusion cavity drives the second extrusion plate to move, the second extrusion plate in turn drives the solid-liquid phase change material and the first extrusion plate to move, extruding the first extrusion cavity, the gas in the first extrusion cavity is extruded into the lower extrusion cavity of the annular sleeve, the control annular plate moves upward, the annular plate pushes the lifting plate upward through the lifting rod, and the solid part of the solid-liquid phase change material in the fixed-point phase change cavity is lifted upward, so that it is always located above the permafrost layer, which can better absorb the heat above the permafrost layer and reduce the heat transfer from the ground surface to the permafrost layer; in this process, the gas in the upper extrusion cavity is extruded and discharged into the air bag, driving the suspension heat absorption assembly to float upward;

[0019] At the same time, since the volume of the solid-liquid phase change material will increase after changing from solid to liquid, the solid-liquid phase change material in the suspension phase change cavity extrudes the first extrusion plate in the process of gradually changing to liquid, so that the first extrusion plate extrudes the gas in the first extrusion cavity, and the gas in the first extrusion cavity is extruded into the lower extrusion cavity, so that the annular plate drives the lifting plate to move upward through the lifting rod, and the solid part of the solid-liquid phase change material in the fixed-point phase change cavity is lifted to above the permafrost layer.

[0020] When the temperature of the lake water decreases, the solid-liquid phase change material gradually changes from liquid to solid by solidification, and the volume shrinks, at this time, the volume of the solid-liquid phase change material in the suspended phase change cavity shrinks, a negative pressure is formed in the suspended phase change cavity, the gas in the lower extrusion cavity and the gas in the reset cavity enter the first extrusion cavity and the second extrusion cavity respectively, and the first extrusion plate and the second extrusion plate are pushed to move towards each other, and the first extrusion plate and the second extrusion plate gradually displace to the initial position, the air bag discharges gas into the upper extrusion cavity, at this time, the gas in the lower extrusion cavity is sucked out, a negative pressure is formed in the lower extrusion cavity, the annular plate moves downward, and the gravity pressing plate moves upward;

[0021] During the downward movement of the annular plate, the lifting plate is driven to move downward by the lifting rod, and the solid-liquid phase change material in the lifting cavity is extruded into the fixed point phase change cavity through the through hole, at this time, the pressing plate cooperates with the elastic element during the upward movement, and the elastic element sequentially drives the gravity pressing plate, the annular sleeve, the annular plate, the lifting rod and the lifting plate to gradually displace to the initial position.

[0022] Another aspect of the present application also includes a construction method of the pile foundation heat regulation and protection system suitable for water-rich permafrost regions, comprising the following steps:

[0023] Step 1, construction preparation: the construction site is leveled and compacted, and the construction site is measured and laid out to determine the predetermined installation position of the pile foundation;

[0024] Step 2, pile foundation structure installation: drilling operation is performed at the predetermined installation position of the pile foundation, after the drilling operation is completed, the pile foundation is poured at the center of the drilling hole, after the pile foundation is formed, the fixed plate, the assembled fixed point heat absorbing assembly and the suspended heat absorbing assembly are installed on the side wall of the pile foundation in the circumferential direction, the steel reinforcement cage is installed on the side wall of the fixed plate in the circumferential direction, and the suspended net is hinged to the top of the steel reinforcement cage, and the concrete and gravel are filled into the steel reinforcement cage, after the concrete and gravel are solidified and formed, the installation of the pile foundation structure is completed;

[0025] Step 3, quality detection: after the installation of the pile foundation structure is completed, the installation quality of the pile foundation is detected by the staff to ensure that the installation quality of the pile foundation meets the standards.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] 1. The present application blocks the lake water by the steel reinforcement cage, and further combines the fixed point heat absorbing assembly and the suspended heat absorbing assembly, the three-dimensional cooling system formed by the three functions not only effectively reduces the temperature of the environment where the pile foundation is located and the water around it, but also slows down the occurrence of the thermal melting lake phenomenon to a certain extent, and enhances the stability of the permafrost.

[0028] 2. The application reduces the accumulation of surface water in the construction area through the flattening and compaction treatment of the construction site, thereby reducing the risk of accelerated degradation of frozen soil due to water infiltration; the dense structure formed by the concrete and the sand filling steel reinforcement cage further improves the impermeability and freeze-thaw cycle resistance of the pile foundation;

[0029] 3. The application forms a solid protective layer through the fixed plate and the protection cylinder fixedly connected to the side wall of the pile foundation, which not only effectively prevents direct erosion of the hot melt lake water on the pile foundation, but also enhances the stability of the entire pile foundation structure, ensuring its long-term safety under complex geological conditions;

[0030] 4. The first and second extrusion plates are slidingly arranged in the suspension shell, so that the space sizes of the first extrusion cavity, the suspension phase change cavity and the second extrusion cavity can be flexibly changed; when the solid-liquid phase change material in the suspension phase change cavity changes from solid to liquid, the solid-liquid phase change material will extrude the first extrusion plate, and after the first extrusion plate is extruded, the gas in the first extrusion cavity will be delivered to the inside of the annular sleeve, so that the annular plate is lifted, the lifting plate is lifted by the annular plate through the lifting rod, and the solid part of the solid-liquid phase change material in the fixed point phase change cavity is lifted upward, improving the heat absorption efficiency; this is because the upper layer is affected by the temperature, the temperature in the warm season is higher, and upward lifting can make the phase change material absorb heat more fully. In turn, it can more efficiently reduce the temperature of the upper layer, thereby greatly reducing the temperature gradient between the upper and lower layers, inhibiting the heat absorption and melting of deep frozen soil;

[0031] 5. The steel reinforcement cage fixedly arranged on the side wall of the fixed plate not only increases the overall strength of the structure, but also forms a dynamic protective layer through the suspension net hinged at the top. The suspension heat absorption assembly on the suspension net can further reduce the temperature of the water around the pile foundation, reducing the thermal erosion effect of the water on the pile foundation, while the steel reinforcement cage is filled with concrete and sand inside, which effectively increases the stability of the steel reinforcement cage, reduces the possibility of deformation or collapse caused by external forces, and also realizes the insulation of part of the heat, thereby reducing the risk of pile foundation melting. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The present application is suitable for the pile foundation heat regulation and protection system in the water-rich frozen soil area.

[0033] Figure 2 The present application is suitable for the pile foundation heat regulation and protection system in the water-rich frozen soil area.

[0034] Figure 3 The present application is suitable for the pile foundation heat regulation and protection system in the water-rich frozen soil area.

[0035] Figure 4 It is the initial state of the pile foundation heat regulation and protection system suitable for water-rich permafrost regions above the upper limit of permafrost.

[0036] Figure 5 It is the suspended state of the suspended net of the pile foundation heat regulation and protection system suitable for water-rich permafrost regions above the upper limit of permafrost.

[0037] Figure 6 It is the axonometric view of the annular sleeve of the pile foundation heat regulation and protection system suitable for water-rich permafrost regions.

[0038] Figure 7 It is the step diagram of the construction method of the pile foundation heat regulation and protection system suitable for water-rich permafrost regions.

[0039] Figure 8 It is the step diagram of the construction preparation step of the construction method of the pile foundation heat regulation and protection system suitable for water-rich permafrost regions.

[0040] Figure 9 It is the step diagram of the pile foundation structure installation step of the construction method of the pile foundation heat regulation and protection system suitable for water-rich permafrost regions.

[0041] Figure 10 It is the distribution diagram of the solid-liquid phase change material after being lifted in the pile foundation heat regulation and protection system suitable for water-rich permafrost regions.

[0042] 1, pile foundation; 2, fixed plate; 3, protection cylinder; 4, fixed point shell; 5, lifting plate; 6, gravity pressing plate; 7, annular sleeve; 8, annular plate; 9, lifting rod; 10, elastic member; 11, steel reinforcement cage; 12, suspended net; 13, suspended shell; 14, first extrusion plate; 15, second extrusion plate; 16, pressure bearing plate; 17, transmission rod; 18, annular protrusion; 19, air bag, 20: through hole, 21: fixed point phase change cavity, 22: lifting cavity, 23: reset cavity, 24: first extrusion cavity, 25: suspended phase change cavity, 26: second extrusion cavity, 27: upper extrusion cavity, 28: lower extrusion cavity. DETAILED DESCRIPTION

[0043] The application will be described in further detail below with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0044] Example 1

[0045] As Figures 1-10As shown, a pile foundation heat regulation and protection system suitable for water-rich permafrost regions, comprising a fixed plate 2, a plurality of fixed-point heat absorption components and a plurality of suspended heat absorption components, the fixed plate 2 is circumferentially arranged around the pile foundation 1 and located above the ground surface, when the underground ice layer melts, the ground surface subsides and accumulates water, forming a hot melt lake, the fixed plate 2 is close to the lake surface of the hot melt lake, the fixed-point heat absorption component is installed below the fixed plate 2 and circumferentially arranged around the pile foundation 1, the fixed-point heat absorption component is filled with solid-liquid phase change material inside, absorbs heat by melting solid-liquid phase change material, and cools the pile foundation 1, one of the suspended heat absorption components is matched and communicated with one of the fixed-point heat absorption components, the suspended heat absorption component can be suspended in the hot melt lake, the suspended heat absorption component is filled with solid-liquid phase change material inside, absorbs heat by melting solid-liquid phase change material, and cools the water around the pile foundation 1.

[0046] Each of the fixed-point heat absorption components comprises a protection cylinder 3, a fixed-point shell 4 arranged in the protection cylinder 3, and a lifting plate 5, a pressure bearing plate 16 and a gravity pressing plate 6 slidingly installed in the fixed-point shell 4 from top to bottom, and an elastic member 10 arranged at the bottom of the fixed-point shell 4, the protection cylinder 3 is installed below the fixed plate 2;

[0047] As shown in Figure 3 and Figure 10 The lifting plate 5 and the fixed-point shell 4 form a fixed-point phase change cavity 21 at the top of the lifting plate 5, the fixed-point phase change cavity 21 is arranged above the permafrost layer and filled with solid-liquid phase change material inside, (the fixed-point phase change cavity 21 is located above the permafrost layer, which is to reduce the temperature of the active layer above the permafrost layer and the lake water by phase change of the solid-liquid phase change material inside, thereby protecting the permafrost.), the pressure bearing plate 16 and the lifting plate 5 form a lifting cavity 22, the lifting plate 5 is provided with a vertical through hole 20, the pressure bearing plate 16 is connected with the gravity pressing plate 6 through a transmission rod 17, the top of the gravity pressing plate 6 is provided with an annular protrusion 18, the annular protrusion 18 is slidingly installed with an annular sleeve 7, the annular sleeve 7 is slidingly arranged with an annular plate 8, the annular plate 8 divides the annular sleeve 7 into an upper cavity and a lower cavity, the upper cavity is an upper extrusion cavity 27, and the lower cavity is a lower extrusion cavity 28, the lifting rod 9 passes through the pressure bearing plate 16 and connects with the lifting plate 5 at the top of the annular plate 8, the elastic member 10 is arranged between the bottom of the gravity pressing plate 6 and the fixed-point shell 4, the top of the elastic member 10 is connected with the gravity pressing plate 6, and the bottom of the gravity pressing plate 6 is connected with the fixed-point shell 4, forming a reset cavity 23.

[0048] The suspended heat absorption assembly comprises a suspended shell 13, a first extrusion plate 14 and a second extrusion plate 15 slidingly arranged in the suspended shell 13, and an air bag 19 mounted on the top of the suspended shell 13, wherein the upper extrusion cavity 27 is communicated with the air bag 19 through a pipeline, a first extrusion cavity 24 is formed between the suspended shell 13 and the first extrusion plate 14, a suspended phase change cavity 25 filled with a solid-liquid phase change material is formed between the first extrusion plate 14 and the second extrusion plate 15, a second extrusion cavity 26 is formed between the second extrusion plate 15 and the suspended shell 13, the first extrusion cavity 24 is communicated with a lower extrusion cavity 28 through a pipeline, and the second extrusion cavity 26 is communicated with a reset cavity 23 through a pipeline.

[0049] Further, a steel cage 11 is welded on the side wall of the fixed plate 2, the steel cage 11 is filled with concrete and gravel, the bottom of the steel cage 11 is in contact with the upper limit of frozen soil, the steel cage 11 blocks the melted lake water, a plurality of suspended nets 12 are hinged on the top of the steel cage 11, the suspended shell 13 is arranged on the suspended net 12 through bolts, and the fixed-point heat absorption assembly is located between the steel cage 11 and the pile foundation 1.

[0050] Further, the phase change temperature of the solid-liquid phase change material is 0-6℃, any solid-liquid phase change material with a phase change temperature of 0-6℃ in the prior art can be used, such as a single-component organic substance (such as tetradecane) or a phase change system disclosed in CN 114032075 B, mainly to reduce the temperature of lake water and shallow surface in warm seasons, reduce the temperature gradient between upper and lower layers, and reduce the melting rate of frozen soil, the phase change temperature of the solid-liquid phase change material is within the range of annual fluctuation of the temperature of the lake bottom soil sample and the hot lake, so that the solid-liquid phase change material can change phase, and the elastic member 10 is a reset spring.

[0051] Embodiment 2

[0052] The embodiment provides a cooling method of the pile foundation heat regulation and coordination protection system suitable for a water-rich frozen soil area according to the embodiment 1, and the cooling method comprises the following steps:

[0053] As Figure 3 and Figure 10As shown, when the underground ice layer melts, the ground surface subsides and accumulates water to form a hot melt lake, in the process of temperature rise of the lake water, the solid-liquid phase change material in the suspended phase change cavity 25 melts from solid to liquid, absorbs the heat in the water body, and the temperature of the water body around the pile foundation 1 decreases; at the same time, the solid-liquid phase change material in the fixed point phase change cavity 21 melts from solid to liquid, enters the lifting cavity 22 from the fixed point phase change cavity 21 through the through hole 20, extrudes the pressure bearing plate 16, so that the pressure bearing plate 16 is driven by the downward pressure to move the gravity pressing plate 6 downward, extrudes the gas in the reset cavity 23 to the second extrusion cavity 26, the gas in the second extrusion cavity 26 drives the second extrusion plate 15 to move, and the second extrusion plate 15 in turn drives the solid-liquid phase change material and the first extrusion plate 14 to move, extruding the first extrusion cavity 24. The gas in the first extrusion cavity 24 is extruded into the lower extrusion cavity 28 of the annular sleeve 7, driving the annular plate 8 to move upward, the annular plate 8 drives the lifting plate 5 to move upward through the lifting rod 9, lifting the solid part of the solid-liquid phase change material in the fixed point phase change cavity 21 upward, so that it is always in the shallow layer of the relatively high temperature area, greatly reducing the temperature of the shallow soil and the lake water, and reducing the heat transfer from the ground surface to the permafrost layer; in this process, the gas in the upper part of the annular plate 8 (in the upper extrusion cavity 27) is extruded into the air bag 19, promoting the floating heat absorbing assembly to float upward.

[0054] At the same time, since the volume of the solid-liquid phase change material will increase after changing from solid to liquid, the solid-liquid phase change material in the suspended phase change cavity 25 will extrude the first extrusion plate 14 in the process of gradually changing to liquid, so that the first extrusion plate 14 further extrudes the gas in the first extrusion cavity 24, and the gas in the first extrusion cavity 24 is further extruded into the lower extrusion cavity 28, so that the annular plate 8 further drives the lifting rod 9 to move upward, and the lifting rod 9 further drives the lifting plate 5 to move upward, so that the solid-liquid phase change material in the fixed point phase change cavity 21 is better lifted above the permafrost layer.

[0055] Since the gravity pressing plate 6 will extrude the gas in the reset cavity 23 to the second extrusion cavity 26 when it is pressed, the gas in the upper extrusion cavity 27 is pressed into the air bag 19, and the air bag 19 drives the suspended shell 13 to float in the lake water, so that the solid-liquid phase change material in the suspended phase change cavity 25 can better absorb the heat in the lake water, and the temperature around the area where the pile foundation 1 is located is reduced.

[0056] As shown in the figure, Figure 3As shown, when the temperature of the lake water decreases, the solid-liquid phase change material gradually changes from liquid to solid by solidification, and the volume shrinks. At this time, the volume of the solid-liquid phase change material in the suspended phase change cavity 25 shrinks, a negative pressure is formed in the suspended phase change cavity 25, the gas in the lower extrusion cavity 28 and the gas in the reset cavity 23 enter the first extrusion cavity 24 and the second extrusion cavity 26 respectively, and the first extrusion plate 14 and the second extrusion plate 15 are pushed to move towards each other. The first extrusion plate 14 and the second extrusion plate 15 gradually displace to the initial position and reset. The air bag 19 discharges gas into the upper extrusion cavity 27. At this time, because the gas in the lower extrusion cavity 28 is sucked out, a negative pressure is formed inside the lower extrusion cavity 28, so that the annular plate 8 moves downward, and the pressing plate moves upward.

[0057] During the downward movement of the annular plate 8, the lifting plate 5 is driven by the lifting rod 9 to move downward, and the solid-liquid phase change material (liquid) in the lifting cavity 22 is extruded through the through hole 20 to the fixed point phase change cavity 21. At this time, the pressing plate moves upward in cooperation with the elastic member 10, which in turn drives the gravity pressing plate 6, the annular sleeve 7, the annular plate 8, the lifting rod 9 and the lifting plate 5 to gradually displace to the initial position.

[0058] Embodiment 3

[0059] As Figures 7-9 shown, on the basis of embodiment 1 and embodiment 2, a construction method of a pile foundation heat regulation and coordination protection system suitable for water-rich frozen soil area is provided, comprising the following steps:

[0060] Step 1, construction preparation: the construction site is leveled and compacted, and the construction site is measured and laid out to determine the predetermined installation position of the pile foundation 1.

[0061] Step 2, installation of pile foundation structure: drilling operation is performed at the predetermined installation position of the pile foundation 1. After the drilling operation is completed, the pile foundation 1 is poured at the center of the drilling hole. After the pile foundation 1 is formed, the fixed plate 2, the assembled fixed point heat absorption assembly and the suspended heat absorption assembly are installed on the side wall of the pile foundation 1 in the circumferential direction. The fixed plate 2 is located above the ground surface to provide sufficient height for the installation of the steel reinforcement cage 11. The steel reinforcement cage 11 is installed on the side wall of the fixed plate 2 in the circumferential direction, and the suspended net 12 is hinged to the top of the steel reinforcement cage 11. Meanwhile, the steel reinforcement cage 11 is filled with concrete and gravel. After the concrete and gravel are solidified and formed, the installation of the pile foundation structure is completed.

[0062] Step 3, quality detection: after the installation of the pile foundation structure is completed, the installation quality of the pile foundation 1 is detected by the staff to ensure that the installation quality of the pile foundation 1 meets the standards.

[0063] Further, when determining the predetermined installation position of the pile foundation 1, the staff marks the predetermined installation position with a sleeve, and performs drilling operation at the position of the sleeve.

[0064] Further, when the pile foundation 1 is cast, a worker first installs a casting cylinder at the center of the drilled hole, and fills the casting cylinder with concrete to cast the pile foundation 1.

[0065] Further, after the concrete in the reinforcement cage 11 is solidified and formed, the worker removes the sleeve to complete the installation of the pile foundation 1.

[0066] The above merely describes preferred embodiments of the present application, and it should be noted that those of ordinary skill in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of the present application.

Claims

1. A pile foundation thermal regulation and synergistic protection system suitable for water-rich permafrost regions, characterized in that, It includes a fixed plate, multiple fixed-point heat absorption components and multiple suspended heat absorption components. The fixed plate is arranged around the circumference of the pile foundation. The fixed-point heat absorption components are installed below the fixed plate and arranged around the circumference of the pile foundation. The fixed-point heat absorption components are filled with solid-liquid phase change material. One of the suspended heat absorption components is matched and connected with one of the fixed-point heat absorption components. The suspended heat absorption components are filled with solid-liquid phase change material. Each of the aforementioned fixed-point heat absorption components includes a fixed-point outer shell, an elastic element disposed at the bottom of the fixed-point outer shell, and a lifting plate, a pressure plate, and a gravity pressing plate slidably installed from top to bottom within the fixed-point outer shell. A fixed-point phase change cavity is formed between the top of the lifting plate and the fixed-point outer shell. The fixed-point phase change cavity is located above the permafrost layer and is filled with a solid-liquid phase change material. A lifting cavity is formed between the pressure plate and the lifting plate, and the fixed-point phase change cavity communicates with the lifting cavity. The pressure plate is connected to the gravity pressing plate via a transmission rod. The top of the gravity pressing plate... An annular protrusion is provided, and an annular sleeve is slidably installed on the annular protrusion. An annular plate is slidably arranged inside the annular sleeve, and the annular plate divides the annular sleeve into upper and lower cavities. The upper cavity is the upper extrusion cavity and the lower cavity is the lower extrusion cavity. A lifting rod passes through the pressure plate and connects to the top of the annular plate. An elastic element is arranged between the bottom of the gravity pressing plate and the fixed-point housing. The top of the elastic element is connected to the gravity pressing plate. A reset cavity is formed between the bottom of the gravity pressing plate and the fixed-point housing. The suspended heat absorption assembly includes a suspended shell, a first extrusion plate and a second extrusion plate slidably disposed within the suspended shell, and an air bag installed on the top of the suspended shell. The upper extrusion chamber is connected to the air bag. A first extrusion chamber is formed between the suspended shell and the first extrusion plate. A suspended phase change chamber is formed between the first extrusion plate and the second extrusion plate. The suspended phase change chamber is filled with a solid-liquid phase change material. A second extrusion chamber is formed between the second extrusion plate and the suspended shell. The first extrusion chamber is connected to the lower extrusion chamber. The second extrusion chamber is connected to the reset chamber. The upper extrusion chamber is connected to the air bag via a pipeline, the first extrusion chamber is connected to the lower extrusion chamber via a pipeline, and the second extrusion chamber is connected to the reset chamber via a pipeline.

2. The pile foundation thermal regulation and synergistic protection system applicable to water-rich permafrost areas according to claim 1, characterized in that, The fixed-point outer shell is installed inside a protective cylinder, which is bolted to the side wall of the pile foundation, and adjacent protective cylinders are fixedly connected by bolts.

3. The pile foundation thermal regulation and synergistic protection system applicable to water-rich permafrost areas according to claim 1, characterized in that, A steel cage is welded to the side wall of the fixing plate. The steel cage is filled with concrete and gravel, and the bottom of the steel cage is in contact with the upper limit of the frozen soil.

4. The pile foundation thermal regulation and synergistic protection system applicable to water-rich permafrost areas according to claim 3, characterized in that, The top of the steel cage is hinged to a suspended net, and the suspended outer shell is embedded in the suspended net.

5. The pile foundation thermal regulation and synergistic protection system applicable to water-rich permafrost areas according to claim 2, characterized in that, The protective cylinder is installed below the fixed plate.

6. The pile foundation thermal regulation and synergistic protection system applicable to water-rich permafrost areas according to claim 1, characterized in that, The lifting plate has a vertical through hole, and the fixed-point phase change cavity is connected to the lifting cavity through the through hole.

7. The pile foundation thermal regulation and synergistic protection system applicable to water-rich permafrost areas according to claim 1, characterized in that, The fixing plate is located above the ground surface.

8. The construction method of the pile foundation thermal regulation and synergistic protection system applicable to water-rich permafrost areas as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1, Construction Preparation: The construction site is leveled and compacted, and the construction location is measured and marked out to determine the predetermined installation position of the pile foundation. Step 2, Pile Foundation Structure Installation: Drilling is performed at the predetermined installation location of the pile foundation. After drilling is completed, the pile foundation is poured at the center of the borehole. After the pile foundation is formed, a fixing plate, the assembled fixed-point heat absorption component and the suspended heat absorption component are installed around the side wall of the pile foundation. A steel cage is installed around the side wall of the fixing plate, and a suspended net is hinged to the top of the steel cage. At the same time, concrete and sand are filled into the steel cage. The installation of the pile foundation structure is completed after the concrete and sand have solidified. Step 3, Quality Inspection: After the pile foundation structure is installed, the staff will inspect the installation quality of the pile foundation to ensure that the installation quality meets the standards.

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