Implanted prefabricated geothermal energy pile

Abstract

According to the implantable prefabricated geothermal energy pile, on the basis of the structure of a common prefabricated pile, the spiral boss structure surrounding the pile body is arranged on the peripheral wall of the prefabricated pile body, and the spiral boss structure enables the pile body to be in full contact and occlusion with cemented soil at the position of the implantable pile; secondly, a heat exchange pipe used for circulating a heat exchange medium in the energy pile is embedded in the spiral boss structure, the arrangement track of the heat exchange pipe coincides with the extending track of the spiral boss structure on the outer wall of the pile, the heat exchange pipe can be completely hidden in the spiral boss structure, the sufficient protection effect on the heat exchange pipe is achieved, and the service life of the heat exchange pipe is prolonged; due to the outline shape of the spiral boss structure, the heat exchange pipe can be prevented from being annularly extruded and collided in the pile planting process, the sinking resistance of the heat exchange pipe in the vertical direction can be reduced, and the resistance of the heat exchange pipe is improved; in addition, the spiral boss structure protrudes out of the outer wall of the pile, and therefore the heat exchange pipe is located in the spiral boss structure and has no influence on the bearing performance of the pile.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of building construction technology, and particularly relates to a built-in prefabricated geothermal energy pile. BACKGROUND

[0002] The ground source heat pump system is a kind of high-efficiency building energy-saving technology, but it relies on the heat exchange pipe buried in the ground and the underground rock-soil body to exchange heat, and the initial drilling and pipe burying cost is high, which affects its further popularization and use. The geothermal energy pile is a kind of pile foundation pipe burying technology, which directly buries the heat exchange pipe of the ground source heat pump system in the building pile foundation, so that the drilling cost of the buried heat exchange pipe can be saved, and the initial investment of the ground source heat pump system is reduced.

[0003] The existing geothermal energy pile technology is mainly based on cast-in-place bored pile and prefabricated pipe pile, but the heat exchange pipe construction of cast-in-place bored pile consumes a lot of working hours, and when the reinforcement cage of cast-in-place bored pile needs to be longer, the heat exchange pipe binding will occupy manpower and construction equipment resources. It is not convenient to bury the heat exchange pipe in the inner cavity of the prefabricated pipe pile, and the bottom sealing plate causes the soil squeezing effect to be intensified, so it is not suitable for densely built urban areas.

[0004] In recent years, the implantable prefabricated pile represented by static drilling root pile has developed rapidly, which overcomes the vibration and noise pollution caused by the construction of traditional prefabricated pile hammering and static pressure method, and the large amount of mud discharge problem caused by the construction of cast-in-place bored pile, and is a new type of non-soil squeezing green pile foundation. The geothermal energy pile based on the implantable prefabricated pile is constructed by first drilling and grouting and mixing to form cement-soil, and then implanting the high-strength prefabricated core pile with heat exchange pipe arranged on the outer wall, which has a broad application prospect compared with the geothermal energy pile based on cast-in-place bored pile and prefabricated pipe pile.

[0005] However, this implantable geothermal energy pile technology still has some problems, such as the heat exchange pipe may be damaged and detached when the heat exchange pipe is implanted together with the prefabricated pile. In order to solve this problem, the existing static drill energy pile design is to set a clamping groove in the pile body of the prefabricated pile to fix the heat exchange pipe, so as to avoid the heat exchange pipe from being blocked and broken during the implantation process of the prefabricated pile, and to improve the survival rate of the buried pipe. However, the heat exchange pipe in this design still has a contact position with the external concrete, so there is still a certain risk of damage during the pile implantation process. Another solution is to set a spiral protrusion on the outer periphery of the pile body, and to wind the heat exchange pipe around the protrusion. This design, like the above case, although it has a structure to protect the heat exchange pipe, the protection has limitations and cannot completely eliminate the risk of damage to the heat exchange pipe. In addition, there is also a protection scheme of setting an inner recessed pipe groove on the bamboo joint structure of the bamboo joint type static drill energy pile, and setting the heat exchange pipe in the groove. However, this scheme can only reduce the probability of damage to the heat exchange pipe caused by the collision between the pile body and the sidewall of the drill hole during the pile implantation process, and does not reduce the sinking resistance of the heat exchange pipe in the vertical direction or improve its resistance. The protection of the heat exchange pipe is not sufficient. In addition to the above several designs, there is also a prefabricated pile design that directly pours and fixes the heat exchange pipe inside the pipe wall of the prefabricated pile. However, the heat exchange pipe of this design occupies the stress section of the pipe pile concrete, affecting the bearing capacity of the pile body.

[0006] In summary, the existing prefabricated geothermal energy pile design has the technical problem of insufficient protection of the heat exchange pipe, which causes the heat exchange pipe to be easily damaged during the pile implantation process. Content of the utility model

[0007] The technical problem to be solved by the utility model is that the existing prefabricated geothermal energy pile design has the technical problem of insufficient protection of the heat exchange pipe, which causes the heat exchange pipe to be easily damaged during the pile implantation process.

[0008] In order to solve the above problems, the utility model provides an implantable prefabricated geothermal energy pile, which comprises a columnar prefabricated pile body and a spiral protrusion structure integrally connected to the outer peripheral wall of the prefabricated pile body. The spiral protrusion structure is spirally extended along the length direction of the prefabricated pile body. The spiral protrusion structure is embedded with a heat exchange pipe. The layout track of the heat exchange pipe is along the track of the spiral protrusion structure.

[0009] The design of the implantable prefabricated geothermal energy pile, which is provided with a spiral boss structure around the outer wall of the prefabricated pile body, can make the pile body fully contact and engage with the cement soil at the pile planting position, thereby significantly improving the shear strength of the interface between the spiral bamboo joint pile and the cement soil. Furthermore, the heat exchange pipe for the flow of liquid heat exchange medium in the energy pile is buried in the spiral boss structure, and the layout track of the heat exchange pipe coincides with the extension track of the spiral boss structure on the outer wall of the pile. The design can completely hide the heat exchange pipe inside the spiral boss structure, which can avoid contact between the heat exchange pipe and the cement soil in the external pile planting space, and has sufficient protection effect on the heat exchange pipe. The contour shape of the spiral boss structure can not only avoid the radial extrusion and collision of the heat exchange pipe during the pile planting process, but also reduce the vertical sinking resistance of the heat exchange pipe and improve its resistance. The spiral boss structure protrudes from the outer wall of the pile, and no main reinforcement structure connected with the main reinforcement inside the prefabricated pile body is arranged in the spiral boss structure, so the spiral boss structure has no effect on the strength of the prefabricated pile body, and burying the heat exchange pipe in the spiral boss structure will not affect the bearing capacity of the pile body.

[0010] As a preferred scheme, the prefabricated pile body is provided with two spiral boss structures spaced apart by a predetermined distance, and a heat exchange pipe is buried in each of the two spiral boss structures. Each heat exchange pipe is provided with an interface at each end along the length direction of the prefabricated pile body. The design adopts a structure in which two spiral boss structures are arranged side by side at a certain distance, and a heat exchange pipe is arranged in each spiral boss structure. The heat exchange pipes in the two spiral boss structures are connected at the ends. This structure can stably control the distance between the liquid inlet and outlet passages of the heat exchange pipe, avoid thermal interference between the liquid inlet and outlet passages, and enhance the heat exchange stability.

[0011] As a preferred scheme, the interfaces of the two heat exchange pipes at one end of the prefabricated pile body are connected through a hose or a U-shaped bend structure. The interfaces of the heat exchange pipes at the other end of the prefabricated pile body are connected to a heat pump unit through a pipe. The design provides a preferred structure for connecting the pipe ends of the heat exchange pipes. A U-shaped bend structure is arranged at the tail end of the heat exchange pipe, i.e. at the bottom end of the prefabricated pile body, to connect the heat exchange pipes in the two spiral boss structures. The U-shaped bend structure connects the two heat exchange pipes to form a heat exchange loop, and the U-shaped bend structure can avoid stress concentration and damage.

[0012] As a preferred scheme, the prefabricated pile body includes two or more pile body units connected end to end. The lower end of the upper pile body unit and the upper end of the lower pile body unit are provided with annular diameter expansion end plates, and the diameter expansion end plates are provided with a reserved hole structure. The heat exchange pipe buried in the upper pile body unit is connected to the heat exchange pipe buried in the lower pile body unit through a connecting pipe penetrating through the reserved hole structure.

[0013] The design is mainly to optimize the length of the single pile. When the length of the pile body is greater than a certain value, the design of the pile is usually adopted, which is generally used for a pile body with a length greater than 15 m. At this time, a plurality of pile units are sequentially connected at the end of the pile body, and an auxiliary connecting expansion end plate is arranged at the end of the pile body. The structure of the expansion end plate extends vertically outside the outer wall of the pile body. Such a structure is convenient for connecting the end of the pile, and can effectively protect the spiral boss structure during pile planting. A reserved hole structure is arranged on the expansion end plate, and a heat exchange pipe can be arranged through the reserved hole structure. As an optional design, a connecting pipe is fixedly arranged at the reserved hole structure, and the heat exchange pipe is arranged through the connecting pipe. Through the structure, the heat exchange pipe can be effectively protected at the pile connection position. The heat exchange pipe can pass through the connection position of the adjacent pile units, and the heat exchange pipe can be protected by the expansion end plate, thereby ensuring the overall communication effect of the heat exchange pipe in the pile body.

[0014] As an optional solution, the interfaces of the two heat exchange pipes embedded in the lowermost section of the pile body at the lower end of the pile body are connected by the hose or U-shaped bend structure. The design optimizes the position structure of the heat exchange pipe at the lowermost end of the pile. A U-shaped bend structure is arranged at the bottom of the pile to connect the heat exchange pipes in the two spiral boss structures. The U-shaped bend structure connects the two heat exchange pipes to form a heat exchange loop, and the U-shaped bend structure can avoid stress concentration and damage.

[0015] As an optional solution, the interfaces of the two heat exchange pipes embedded in the lowermost section of the pile body at the lower end of the pile body are connected by the hose or U-shaped bend structure. The design optimizes the position structure of the heat exchange pipe at the lowermost end of the pile. A U-shaped bend structure is arranged at the bottom of the pile to connect the heat exchange pipes in the two spiral boss structures. The U-shaped bend structure connects the two heat exchange pipes to form a heat exchange loop, and the U-shaped bend structure can avoid stress concentration and damage.

[0016] As an optional solution, the distance between the two spiral boss structures in the axial direction of the pile body is greater than 0.2 meters, and the pitch of the spiral boss structure is greater than 0.4 meters. The design limits the minimum distance between the two spiral boss structures, mainly to ensure that the heat exchange pipes for one-way heat exchange have sufficient spacing, thereby effectively avoiding heat exchange between the heat exchange pipes, thereby causing loss of heat exchange capacity.

[0017] As a preferred scheme, the protruding height of the spiral boss structure is greater than or equal to 1.05 times of the outer diameter of the heat exchange pipe, and the top width of the spiral boss structure is greater than or equal to 1.1 times of the outer diameter of the heat exchange pipe. The design optimizes the size ratio between the spiral boss and the heat exchange pipe protected therein, and the size ratio can ensure the protection effect on the heat exchange pipe and also has a heat conduction effect, so as to ensure the heat exchange efficiency of the heat exchange pipe.

[0018] As a preferred scheme, a plurality of axial main reinforcements arranged along the length direction of the prefabricated pile body unit are embedded in the prefabricated pile body unit, and the outer edge region of the axial main reinforcement is provided with a hoop reinforcement surrounding the axial main reinforcement; the diameter expansion end plate is provided with a main reinforcement fixing hole, and the main reinforcement fixing hole is connected with the axial main reinforcement embedded in the prefabricated pile body. The design optimizes the main reinforcement structure in the prefabricated pile body, mainly including the axial main reinforcement along the length direction of the pile and the hoop reinforcement arranged around, and it should be noted that the spiral boss structure does not arrange the main reinforcement structure. In order to ensure the butt joint firmness between the diameter expansion end plate and the pile body unit, the main reinforcement in the diameter expansion end plate and the pile body unit is connected and fixed, the main reinforcement fixing hole is arranged on the diameter expansion end plate, the main reinforcement is vertically fixed through the hole structure, and the diameter expansion end plate can be fixed at the end of the pile body unit.

[0019] As a preferred scheme, the bottom end of the lowermost section prefabricated pile body unit and the top end of the uppermost section prefabricated pile body unit are provided with annular end plate pieces; the outer diameter of the end plate piece is smaller than the outer diameter of the diameter expansion end plate, and the end plate piece is also provided with the main reinforcement fixing hole for fixing the main reinforcement of the prefabricated pile body. The end part design of the prefabricated pile body is further optimized, and the diameter expansion end plate design similar to the pile joint is adopted, the structure of the end plate piece is basically consistent with the diameter expansion end plate, and the difference lies in that since the end plate piece is located at the overall end of the prefabricated pile body, the structure for the auxiliary heat exchange pipe to pass through is no longer needed, and therefore only the main reinforcement fixing shell is arranged without the reserved hole structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A structure schematic view of the implantable prefabricated geothermal energy pile is provided in the utility model.

[0021] Figure 2 A structure schematic view of the implantable prefabricated geothermal energy pile is provided in the utility model. Figure 1 A cross-sectional structure schematic view of the implantable prefabricated geothermal energy pile is provided in the utility model.

[0022] Figure 3 A structure schematic view of the implantable prefabricated geothermal energy pile is provided in the utility model. Figure 1 A structure schematic view of the implantable prefabricated geothermal energy pile is provided in the utility model.

[0023] Figure 4 A cross-sectional structure schematic view of another implantable prefabricated geothermal energy pile is provided in the utility model.

[0024] Figure 5 For Figure 1 Structure diagram of the end plate of the implantable prefabricated geothermal energy pile;

[0025] Figure 6 For Figure 1 Structure diagram of the end plate of the implantable prefabricated geothermal energy pile;

[0026] Wherein, Figures 1-6 For

[0027] 1, prefabricated pile body; 1-1, axial main reinforcement; 1-2, hoop stirrup; 1-3, pile unit; 2, spiral boss structure; 3, heat exchange pipe; 3-1, U-shaped bend structure; 4, expanding end plate; 4-1, main reinforcement fixing hole; 4-2, reserved hole structure; 4-3, connecting pipe; 5, end plate; 6, unit inlet pipe; 7, unit outlet pipe; 8, heat pump unit; 9, building energy module. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following will further describe the present application in combination with specific embodiments.

[0029] Before the working principle of the present application is described in detail, the description of the present application needs to be further explained: in the description of the present application, it should be pointed out that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can be detachable connection, or integral connection; can be mechanical connection, can be direct connection, can be indirect connection through intermediate medium, or can be two elements welded connection. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Reference Figures 1-4 The following examples are described as follows, Figure 1 Structure diagram of the implantable prefabricated geothermal energy pile provided by the present application;Figure 2 As Figure 1 A cross-sectional structure diagram of an implantable prefabricated geothermal energy pile; Figure 3 As Figure 1 A structure diagram of a middle pile body unit in an implantable prefabricated geothermal energy pile. Figure 4 A cross-sectional structure diagram of another implantable prefabricated geothermal energy pile.

[0032] The embodiment of the utility model provides a kind of implantable prefabricated geothermal energy pile, including columnar prefabricated pile main body 1 and spiral boss structure 2 integrally connected to the outer peripheral wall of prefabricated pile main body 1, spiral boss structure 2 extends from one end of prefabricated pile main body 1 to the other end, heat exchange pipe 3 is embedded in spiral boss structure 2, and the layout track of heat exchange pipe 3 is along the track of spiral boss structure 2.

[0033] This implantable prefabricated geothermal energy pile design, add spiral boss structure 2 that surrounds pile body in the outer peripheral wall of prefabricated pile main body, the spiral boss structure 2 can make pile body and cement soil of pile planting position fully contact engagement, can significantly improve the shear strength of helical bamboo joint pile and cement soil interface;Further, heat exchange pipe 3 for circulating liquid heat exchange medium in energy pile is embedded in spiral boss structure 2, and the layout track of heat exchange pipe 3 coincides with the extension track of spiral boss structure 3 on pile outer wall.This design can hide heat exchange pipe 3 completely in spiral boss structure 2, can avoid heat exchange pipe 3 and the contact of cement soil in external pile planting space, has sufficient protection effect to heat exchange pipe 3, and the contour shape of spiral boss structure 2 itself, not only can avoid heat exchange pipe to be extruded and collide in pile planting process, but also can reduce the sinking resistance of heat exchange pipe 3 in vertical direction, improve its resistance;Spiral boss structure 2 itself is protruded to the structure of pile outer wall, and its inside is not set up main reinforcement structure connected with the main reinforcement inside prefabricated pile main body, so spiral boss structure has no influence to the strength of prefabricated pile main body, and burying heat exchange pipe in spiral boss structure also will not affect pile body bearing performance.

[0034] In the technical scheme provided by the embodiment, the outer peripheral wall of the precast pile body 1 is provided with two helical boss structures 2 spaced apart by a preset distance, and a heat exchange pipe 3 is embedded in each of the two helical boss structures 2. The two heat exchange pipes 3 are respectively used for liquid inlet and liquid outlet of a liquid heat exchange medium, and each heat exchange pipe 3 is provided with an interface at each end along the length direction of the precast pile body 1. The design adopts a structure in which the two helical boss structures 2 are parallel to each other at a certain distance, and one heat exchange pipe 3 is arranged in each helical boss structure 2. The heat exchange pipes 3 located in the two helical boss structures 2 are communicated at the upper and lower ends of the precast pile body 1. When the precast pile body 1 is in the butt joint condition of a plurality of pile units 1-3, the two heat exchange pipes 3 with opposite liquid flow directions are only communicated at the lowermost end and the uppermost end of the precast pile body 1 by a pump and a power module. Through such a structure, the distance between the liquid inlet passage and the liquid outlet passage of the heat exchange pipe 3 surrounding the pile body can be increased, so that the heat exchange between the liquid inlet and the liquid outlet is avoided in advance, and the heat conduction effect is not lost.

[0035] In the technical scheme provided by the embodiment, the distance between the two adjacent helical boss structures 2 along the axial direction of the precast pile body 1 is greater than 0.2 m, and the pitch of the helical boss structure 2 is greater than 0.4 m. The design limits the minimum distance between the two helical boss structures 2, mainly to ensure that the heat exchange pipes 3 for unidirectional heat exchange liquid have sufficient spacing, so as to effectively avoid heat exchange between the heat exchange pipes 3 and reduce the loss of heat exchange capacity.

[0036] According to the distance setting of the heat exchange pipe 3: taking the PHC500(100)AB type precast pile as the static drilling root pile core pile, the distance settings of the heat exchange pipe 3 are 0.1 m, 0.2 m, 0.3 m and 0.4 m. The performance coefficient COP, i.e. the refrigerating capacity or heating capacity provided by the equipment under unit power consumption, is the lowest in the four working conditions under the pipe spacing of 0.1 m. When the pipe spacing increases to 0.2 m, the average COP of each time period is improved and tends to be stable. Therefore, the preferred design in the embodiment is that the distance between the heat exchange pipes 3 should be not less than 0.2 m, so the preferred numerical range of the distance between the helical boss structures 2 in which the heat exchange pipes 3 are embedded is greater than 0.2 m. The specific size can be adaptively adjusted and selected according to the length of the precast pile and the heat exchange efficiency requirement.

[0037] As a further optimization of the above embodiment scheme, the protrusion height of the helical boss structure is greater than or equal to 1.05 times the outer diameter of the heat exchange pipe, and the top width of the helical boss structure is greater than or equal to 1.1 times the outer diameter of the heat exchange pipe. The design optimizes the size ratio between the helical boss structure and the heat exchange pipe protected therein. Such a size ratio can not only ensure the protection effect of the heat exchange pipe, but also has a heat conduction effect to ensure the heat exchange efficiency of the heat exchange pipe.

[0038] Reference Figure 5 、 Figure 6 The following examples are described, Figure 5 For Figure 1 The structure diagram of the diameter expansion end plate of the implantable prefabricated geothermal energy pile is shown in the figure. Figure 6 For Figure 1 The structure diagram of the end plate part of the implantable prefabricated geothermal energy pile is shown in the figure.

[0039] In the technical scheme provided by the embodiment, the prefabricated pile body 1 includes two or more pile body units 1-3 connected end to end in sequence, the end portions of adjacent pile body units 1-3 are provided with annular diameter expansion end plates 4, the diameter expansion end plates 4 are provided with reserved hole structures 4-2 for the heat exchange pipes 3 to pass through at positions corresponding to the spiral boss structures 2, the reserved hole structures 4-2 are provided with fixed connection pipes 4-3, and the heat exchange pipes 3 of the respective adjacent pile body units 1-3 are connected into an integrated whole through the fixed connection pipes 4-3 of the diameter expansion end plates 4.

[0040] The design is an optimization of the prefabricated pile with a single pile length, generally when the length of the prefabricated pile body 1 is greater than a certain value, a pile connection design is often used, generally on a prefabricated pile with a length greater than 15 m, at this time, a design of sequentially connecting end to end a plurality of pile body units 1-3 is adopted, and a diameter expansion end plate 4 is arranged at the joint position between the pile body units 1-3, the structure of the diameter expansion end plate 4 extends vertically outside the outer wall of the prefabricated pile body 1, such a structure is convenient for the joint of the pile end, and can provide sufficient protection for the spiral boss structure 2 during pile implantation, and the reserved hole structure 4-2 is arranged on the diameter expansion end plate 4, through which the heat exchange pipes 3 of the adjacent pile body units 1-3 can pass through the joint during the joint of the pile body units 1-3, it should be noted that the liquid flow direction of the heat exchange pipes 3 of the adjacent pile body units 1-3 is considered during the pipe connection, the inlet pipe is connected with the inlet pipe, and the outlet pipe is connected with the outlet pipe, not only the heat exchange pipes 3 can pass through the joint position of the adjacent pile body units 1-3, but also the heat exchange pipes 3 can be protected by the diameter expansion end plate 4, to ensure the overall communication effect of the heat exchange pipes 3 in the prefabricated pile body 1.

[0041] In addition, it should be noted that the heat exchange pipes embedded in the spiral boss structure are fixed after the pile foundation is prefabricated, and during the pile foundation installation process, the reserved holes of the diameter expansion end plate are passed through the connection pipes 4-3 to realize the connection of the heat exchange pipes of the upper and lower pile body units 1-3, and the connection pipes 4-3 themselves have good rigidity to ensure the protection of the internal heat exchange pipes 3.

[0042] In the technical scheme provided by the embodiment, the diameter expansion end plate 4 is provided with a main reinforcement fixing hole 4-1 for the main reinforcement in the prefabricated pile body 1 to pass through. In order to ensure the firmness of the joint between the diameter expansion end plate 4 and the pile unit 1-3, the diameter expansion end plate 4 is connected and fixed with the main reinforcement in the pile unit 1-3, the main reinforcement fixing hole 4-1 is arranged on the diameter expansion end plate 4, and the main reinforcement is fixed by vertically penetrating the hole structure, so that the diameter expansion end plate 4 can be firmly positioned at the end of the pile unit 1-3.

[0043] In the technical scheme provided by the embodiment, the pile unit 1-3 at the bottom end of the prefabricated pile body 1 is provided with a U-shaped elbow structure 3-1 communicating two heat exchange pipes 3 at the bottom end of the spiral boss structure 2. The design provides a preferred pipe end communication structure design of the heat exchange pipe 3. The U-shaped elbow structure 3-1 communicating the respective heat exchange pipes 3 in the two spiral boss structures 2 is arranged at the tail end of the heat exchange pipe 3, that is, the bottom end position of the prefabricated pile body 1. The U-shaped elbow structure 3-1 is preferably hidden by a boss structure similar to the spiral boss structure 2, and the U-shaped elbow structure 3-1 can avoid stress concentration and damage.

[0044] In the technical scheme provided by the embodiment, the pile unit 1-3 at the top end of the prefabricated pile body 1 is respectively provided with a unit liquid inlet pipe 6 and a unit liquid outlet pipe 7 communicating with two heat exchange pipes 3 at the top end of the spiral boss structure 2. The unit liquid inlet pipe 6 and the unit liquid outlet pipe 7 are connected with a heat pump unit 8 and a building energy module 9. The design optimizes the top end design of the heat exchange pipe 3, that is, the heat dissipation design in the building. The heat pump unit 8 and the building energy module 9 are communicated through the unit liquid inlet pipe 6 and the unit liquid outlet pipe 7, and the flow rate of the liquid in the heat exchange pipe 3 is ensured through the pump to ensure the heat exchange efficiency.

[0045] In the technical scheme provided by the embodiment, the top end of the pile unit 1-3 at the top end of the prefabricated pile body 1 and the bottom end of the pile unit 1-3 at the bottom end of the prefabricated pile body 1 are both provided with an annular end plate 5, and the end plate 5 is also provided with a main reinforcement fixing hole 4-1 for fixing the main reinforcement of the prefabricated pile body 1. The design further optimizes the end design of the prefabricated pile body 1. The end plate 5 has a structure similar to the diameter expansion end plate 4 for pile connection. The difference is that the end plate 5 is located at the overall end of the prefabricated pile body 1, so it is no longer necessary to arrange a structure for the auxiliary heat exchange pipe 3 to pass through, and therefore only the main reinforcement fixing hole 4-1 is arranged without the reserved hole structure 4-2.

[0046] In the technical scheme provided by the embodiment, the precast pile body 1 is embedded with a plurality of axial main bars 1-1 arranged along the length direction thereof, and the outer edge region of the axial main bar 1-1 is provided with a hoop bar 1-2 surrounding the axial main bar 1-1. The design optimizes the main bar structure in the precast pile body 1, mainly including the axial main bar 1-1 along the length direction of the pile and the hoop bar 1-2 arranged around, and it should be noted that the spiral boss structure 2 is not provided with a main bar structure.

[0047] The precast pile body 1 in the above embodiment, i.e. the spiral bamboo joint pile, is made of high-strength concrete as a whole, and is divided into two types of piles, i.e. a basic type with a total pile length ≤ 15 m or a combined type with a total pile length > 15 m, and the combined type can be further divided into a combined type top pile, a combined type middle pile and a combined type bottom pile, and the pile type combination can be flexibly adjusted according to needs.

[0048] The implantable precast geothermal energy pile is constructed and installed by a static drilling rooting method, specifically, the precast pile body 1 is placed into the pre-drilled hole and then mixed with cement to form a fluid cement soil, thereby forming the implantable precast geothermal energy pile. After the construction of the implantable precast geothermal energy pile is completed, the unit liquid inlet pipe 6 and the unit liquid outlet pipe 7 of the heat pump unit 8 are connected with the water inlet pipe inlet and the water outlet pipe outlet of the heat exchange pipe 3 at the top of the precast pile respectively, thereby forming a complete circulating heat exchange loop and connecting the building energy module 9.

[0049] Although the utility model discloses as above, the protection scope of the utility model disclosed is not limited to this. The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. An implantable prefabricated geothermal energy pile, comprising a columnar prefabricated pile body (1) and a helical boss structure (2) integrally connected to the peripheral wall of the prefabricated pile body (1), characterized in that, The spiral boss structure (2) is arranged in a spiral along the length direction of the prefabricated pile body (1), and a heat exchange pipe (3) is embedded in the spiral boss structure (2); the layout track of the heat exchange pipe (3) is along the track of the spiral boss structure (2).

2. The implanted pre-fabricated geothermal energy pile according to claim 1, characterized in that, Two spiral boss structures (2) are arranged at intervals on the outer peripheral wall of the prefabricated pile body (1), and one heat exchange pipe (3) is embedded in each spiral boss structure (2); the two ends of each heat exchange pipe (3) are respectively provided with interfaces along the length direction of the prefabricated pile body (1).

3. An implanted pre-fabricated geothermal energy pile according to claim 2, characterized in that, The interfaces of the two heat exchange pipes (3) at one end of the prefabricated pile body (1) are connected through a hose or a U-shaped elbow structure (3-1); the interfaces of the heat exchange pipes (3) at the other end of the prefabricated pile body (1) are connected to a heat pump unit (8) through a pipeline.

4. An implanted pre-fabricated geothermal energy pile according to claim 3, characterized in that, The prefabricated pile body (1) comprises two or more pile units (1-3) which are sequentially connected end to end; the lower end of the upper prefabricated pile unit (1-3) and the upper end of the lower prefabricated pile unit (1-3) are provided with annular diameter expansion end plates (4); the diameter expansion end plates (4) are provided with reserved hole structures (4-2); the heat exchange pipes (3) embedded in the upper prefabricated pile unit (1-3) and the heat exchange pipes (3) embedded in the lower prefabricated pile unit (1-3) are connected through a connecting pipe (4-3) penetrating the reserved hole structure (4-2).

5. An implanted pre-fabricated geothermal energy pile according to claim 4, characterized in that, The interfaces of the two heat exchange pipes (3) embedded in the lowermost prefabricated pile unit (1-3) at the lower end of the prefabricated pile body (1) are connected through the hose or the U-shaped elbow structure (3-1).

6. The implanted pre-fabricated geothermal energy pile according to claim 4, characterized in that, The interfaces of the two heat exchange pipes (3) embedded in the uppermost prefabricated pile unit (1-3) at the upper end of the prefabricated pile body (1) are respectively connected to a unit inlet pipe (6) and a unit outlet pipe (7); the unit inlet pipe (6) and the unit outlet pipe (7) are connected to a heat pump unit (8) and a building energy module (9).

7. The implanted pre-fabricated geothermal energy pile according to claim 2, characterized in that, The distance between the two spiral boss structures (2) in the axial direction of the prefabricated pile body (1) is greater than 0.2 meters, and the pitch of the spiral boss structure (2) is greater than 0.4 meters.

8. The implanted pre-fabricated geothermal energy pile according to claim 2, characterized in that, The height of the spiral boss structure (2) is greater than or equal to 1.05 times the outer diameter of the heat exchange pipe (3), and the width of the top of the spiral boss structure (2) is greater than or equal to 1.1 times the outer diameter of the heat exchange pipe (3).

9. The implanted pre-fabricated geothermal energy pile according to claim 4, characterized in that, The prefabricated pile unit (1-3) is embedded with a plurality of axial main reinforcement bars (1-1) arranged along the length direction thereof; the outer edge region of the axial main reinforcement bar (1-1) is provided with a hoop reinforcement bar (1-2) surrounding the axial main reinforcement bar (1-1); the diameter expansion end plate (4) is provided with a main reinforcement bar fixing hole (4-1) which is connected to the axial main reinforcement bar (1-1) embedded in the prefabricated pile body (1).

10. The implanted pre-fabricated geothermal energy pile according to claim 4, characterized in that, The bottom end of the lowermost prefabricated pile body unit (1-3) and the top end of the uppermost prefabricated pile body unit (1-3) are provided with annular end plate pieces (5); the outer diameter of the end plate piece (5) is smaller than the outer diameter of the diameter-expanded end plate (4), and the end plate piece (5) is also provided with a main reinforcement fixing hole (4-1) for fixing the main reinforcement of the prefabricated pile body (1).

Images