A heat exchange tube embedded screw pile and a construction method thereof

Abstract

The application belongs to the technical field of screw piles, and discloses an embedded heat exchange pipe type screw pile and a construction method thereof; the problems of high precast cost and poor pile bearing capacity of the screw pile in the prior art are solved; the embedded heat exchange pipe type screw pile specifically comprises a heat exchange pipe, a pile cap, steel structure screw threads, a pile body and a pile tip; a hole is formed in the pile cap; the pile body is connected below the pile cap, and the pile tip is connected to the bottom of the pile body; the steel structure screw threads are spirally and woundly arranged around the pile body; the heat exchange pipe is arranged in the steel structure screw threads and is wound around the pile body along the steel structure screw threads; and both ends of the heat exchange pipe are arranged to pass through the hole. The concrete main body of the screw pile is wrapped between the steel structure outer layer and the hollow steel cone, and has strong load capacity; the heat exchange pipe is arranged in the steel structure screw threads, the heat exchange area is increased, and the heat exchange efficiency is improved; and the construction method of the screw pile of the application rotates the screw pile into the screw pile site by a screw pile machine, and is simple, efficient and low in construction cost.

Description

Technical Field

[0001] This invention relates to the field of screw pile technology, and in particular to a screw pile with an embedded heat exchange tube and its construction method. Background Technology

[0002] With the continuous advancement of urbanization and the increasing scarcity of land resources, super high-rise buildings are constantly emerging. These buildings require greater load-bearing capacity within the limited space of the foundation. Furthermore, the expansion of large-scale infrastructure projects such as transportation, energy, and water conservancy is placing higher demands on the earthquake and wind resistance capabilities of building structures. Driven by these multiple factors, pile foundations have become widely used, and with the deepening implementation of the concept of sustainable development, even higher requirements have been placed on the design of pile foundation engineering.

[0003] Cast-in-place piles and precast piles are common types of pile foundations. Cast-in-place piles have a long construction period, high requirements for site conditions, and generate significant noise and vibration. They are also more difficult to construct in soft soil or high-water-level areas. With the increase in large-scale foundation projects, precast piles have gained more attention due to their advantages of fast construction speed and easy quality control. Screw piles are one type of precast pile.

[0004] Existing screw pile technologies include hollow screw piles and prestressed screw piles. Hollow screw piles save on concrete and reduce costs, but their load-bearing capacity cannot be guaranteed. Prestressed screw piles have a relatively complex prefabrication process, including the tensioning of prestressed steel bars, requiring high-level technology and strict construction control, making the prefabrication process quite complex. Therefore, existing prefabricated screw pile types are limited by load-bearing capacity and installation technology, resulting in significant prefabrication difficulties, high costs, and the use of large amounts of concrete in the pile manufacturing process, requiring substantial raw materials. Therefore, this invention provides a low-cost, high-strength, and high-load-bearing-capacity screw pile. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an embedded heat exchange tube type screw pile and its construction method, thereby solving the problems of high prefabrication cost and poor pile bearing capacity in existing screw piles.

[0006] Firstly, in order to achieve the aforementioned objectives, the technical solution adopted by this invention is as follows: An embedded heat exchange tube type screw pile includes a heat exchange tube, a pile cap, steel threaded threads, a pile body, and a pile tip. The pile cap is a disc-shaped structure with holes inside. The pile body is connected to the bottom of the pile cap, and the pile tip is connected to the bottom of the pile body. Steel threaded threads are spirally wound around the pile body. The heat exchange tube passes through the steel threaded threads and is wound around the pile body along the steel threaded threads. Both ends of the heat exchange tube protrude from the holes. The pile body is a conical hollow cylindrical structure with a larger diameter at the top and a smaller diameter at the bottom. The pile body includes a concrete body, with the pile cap and pile tip connected to the top and bottom of the concrete body, respectively. The outer surface of the concrete body is wrapped with a steel outer layer. A hollow steel cone is connected to the inner surface of the concrete body.

[0007] In this design, the screw pile uses a hollow design combining steel and concrete. A steel outer layer and a hollow steel cone are attached to the outer and inner walls of the pile body, respectively. The concrete body is encased in the middle of the steel outer layer and the hollow steel cone. This design not only realizes the hollow structure of the screw pile, saving concrete raw materials, but also ensures that the steel on the inner and outer sides of the concrete body does not deform under load, thus improving the load-bearing capacity of the screw pile. The heat exchange pipe is inserted inside the steel thread. When the screw pile is driven into the soil, the steel thread comes into direct contact with the soil, increasing the heat exchange area and improving the heat exchange efficiency.

[0008] Furthermore, the holes include inlet holes and outlet holes; the pile body has a pile top interface and a pile bottom interface on its side, and the pile top interface is connected to the inner cavity of the inlet hole; The heat exchange pipe includes an inlet pipe, a spiral pipe, and an outlet pipe. The inlet pipe passes through the inlet hole and the pile top interface in sequence and is connected to one end of the spiral pipe. The spiral pipe is housed inside the steel thread, and the other end of the spiral pipe is connected to the outlet pipe. The outlet pipe enters the pile body from the pile bottom interface and exits the pile cap from the outlet hole.

[0009] In this scheme, the spiral tube is set inside the steel structure thread and wrapped around the pile body along the steel structure thread. The steel structure thread has good thermal conductivity, and the spiral tube is set inside it, which can achieve full heat exchange with the soil. Compared with setting the spiral tube inside the concrete, the heat exchange efficiency is improved, so that the screw pile can fully extract geothermal energy.

[0010] Furthermore, the cross-section of the steel thread is a triangular structure, with one side of the triangular structure abutting against the pile body and forming a closed cavity with the pile body; the spiral tube is inserted into the closed cavity.

[0011] In this design, the steel thread has a triangular cross-section. When connected to the pile body, one side of the triangular structure is connected to the pile body, resulting in a large connection area and a strong connection. Furthermore, this design allows for the installation of the heat exchange pipe and the steel thread by first placing the heat exchange pipe inside the steel thread during the prefabrication of the screw pile, and then connecting the steel thread to the pile body. This makes installation convenient and reduces prefabrication costs.

[0012] Furthermore, the joints between the pile top and the steel structure threaded connections, as well as the joints between the pile bottom and the steel structure threaded connections, are sealed with concrete and sealant.

[0013] In this solution, concrete and sealant are used for sealing to ensure that the heat exchange pipe is enclosed inside the steel thread, preventing the soil from directly contacting the heat exchange pipe during pile driving or subsequent loading, thus extending the service life of the screw pile.

[0014] Furthermore, the pile cap includes a steel pile cap and a concrete pile cap; the steel pile cap is wrapped around the concrete pile cap; the steel pile cap is connected to the top of the outer layer of the steel structure, and the concrete pile cap is connected to the top of the concrete main body.

[0015] In this design, a steel structure nut is incorporated, and the steel structure pile cap is connected to the outer layer of the steel structure. The concrete pile cap and the concrete pile body are encased by the steel structure pile cap and the outer layer of the steel structure, which improves the sealing of the screw pile. Furthermore, the design of the steel structure nut allows for the welding of several screw piles together during construction, making the connection convenient and cost-effective.

[0016] Furthermore, the pile tip includes a steel pile tip and a concrete pile tip, with the steel pile tip encasing the concrete pile tip; the steel pile tip is connected to the bottom of the outer layer of the steel structure, and the concrete pile tip is connected to the bottom of the concrete main body.

[0017] In this scheme, when the screw pile is driven into the soil, the steel pile tip directly contacts the soil and drills into it. During this process, the steel pile tip bears most of the settlement resistance of the screw pile. The design of the steel pile tip to wrap the concrete pile tip improves the sharpness and wear resistance of the pile tip.

[0018] Furthermore, the thermal conductivity of the outer layer of the steel structure ranges from 50 to 80 W / (m·K); the thermal conductivity of the concrete main body ranges from 1.5 to 2 W / (m·K).

[0019] Secondly, based on the embedded heat exchange tube type screw pile provided in the first aspect, the present invention provides a construction method for an embedded heat exchange tube type screw pile, comprising the following steps: S1: Determine the location of the screw post; S2: Screw in the screw at the screw post point; S3: Perform quality inspection on the screw posts.

[0020] In this scheme, the screw pile is screwed into the screw pile point, which is simple and efficient to construct. Compared with cast-in-place piles, it is less difficult to operate and has a lower construction cost.

[0021] Furthermore, S1 includes: S101: Conduct geological surveys and determine the installation location and depth of the bolt piles based on the survey results; S102: Based on the installation location, mark the pile position control points and control axis to determine the screw pile position; S2 includes: S201: The auger enters the construction site and positions the auger's auger hole directly above the auger's pile point; S202: Fix the casing of the auger to the pile cap of the screw pile, and lift the screw pile with the auger so that the pile tip is aligned with the screw pile position. S203: Use a theodolite to correct the screw pile on both the front and side of the screw pile machine. The lines connecting the two theodolites and the screw pile are at 90° to each other, so that the screw pile is parallel to the guide rod. S204: Start the auger pile driver, which drives the screw pile to rotate and drill into the soil; after the screw pile is drilled to the installation depth, the auger pile driver stops running. S205: Repeat steps S202-S204; install several screw posts at the construction site, and proceed to S206 after installation is completed; S206: Connect several screw posts to form a whole; and connect the heat exchange pipes of several screw posts to a heat pump unit to form a heat circulation system; S3 includes: S301: Perform verticality testing on bolted piles and connection strength testing between several bolted piles; S302: Clean up the construction site and dispose of construction waste.

[0022] In this scheme, the screw pile is fixed to the auger by the pile cap, and the auger is started to screw the screw pile into the soil. After the screw pile is installed using this construction method, the screw pile is in close contact with the soil and the screw pile is installed stably. Furthermore, when several screw piles are installed and connected into a whole, they cooperate with each other to share the load pressure when bearing the load, thereby improving the bearing capacity of the screw pile foundation.

[0023] Furthermore, S1 includes: S101: Conduct geological surveys and determine the installation location and depth of the bolt piles based on the survey results; S102: Based on the installation location, mark the pile position control points and control axis to determine the screw pile position; S2 includes: S201: The auger enters the construction site and positions the auger's auger hole directly above the auger's pile point; S202: Drill pilot holes at the screw pile location; and clean the mud and debris inside the pilot holes; S203: Fix the casing of the auger to the pile cap of the screw pile, lift the screw pile with the auger, and align the pile tip of the screw pile with the pilot hole; S204: Use a theodolite to correct the screw pile on both the front and side of the screw pile machine. The lines connecting the two theodolites and the screw pile are at 90° to each other, so that the screw pile is parallel to the guide rod. S205: Start the auger pile driver, which drives the screw pile to rotate and drill into the soil; after the screw pile is drilled to the installation depth, the auger pile driver stops running. S206: Repeat steps S202-S205; install several screw posts at the construction site, and proceed to S207 after installation is completed; S207: Connect several screw posts to form a whole; and connect the heat exchange pipes of several screw posts to a heat pump unit to form a heat circulation system; S3 includes: S301: Perform verticality testing on bolted piles and connection strength testing between several bolted piles; S302: Clean up the construction site and dispose of construction waste.

[0024] In this scheme, when driving the pile, a pilot hole is first drilled at the pile location, and a screw pile is installed on the pilot hole. This ensures that when the auger drives the screw pile to rotate, the steel screw thread of the screw pile is embedded in the inner wall of the pilot hole, so that the steel screw thread moves forward spirally relative to the soil when the screw pile rotates, thus providing traction force for the screw pile to sink. This construction method is suitable for driving screw piles in hard foundations.

[0025] The beneficial effects of this invention are: The embedded heat exchange tube type screw pile provided by this invention adopts a hollow structure. The inner wall of the hollow structure is provided with a hollow steel cone, and the outer wall is provided with a steel outer layer. The steel outer layer and the hollow steel cone can improve the bearing capacity of the screw pile, and the hollow design can reduce the raw material cost of the pile body. The design of the steel outer layer also facilitates the installation of steel thread. The heat exchange tube is designed inside the steel thread, which also has the function of collecting geothermal energy. The design of the heat exchange tube in the steel thread can realize the efficient extraction of geothermal energy.

[0026] The construction method of the embedded heat exchange tube type screw pile provided by the present invention directly screws the screw pile into the soil using a screw pile machine. The screw pile installed in this way is stable and reliable, and is simple and efficient to construct compared with the existing grouting process, with high pile quality. After installing several screw piles, they are connected to each other to form a whole, which further improves the overall bearing capacity of the screw pile. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an embedded heat exchange tube type screw post structure according to the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of a screw post with an embedded heat exchange tube according to the present invention. Figure 3 This is a schematic diagram of a screw-pile heat exchange tube structure with an embedded heat exchange tube according to the present invention. Figure 4 This is a schematic diagram of the outer layer structure of a steel structure with an embedded heat exchange tube screw pile according to the present invention; Figure 5 This is a schematic diagram of a concrete main structure for an embedded heat exchange tube type screw pile according to the present invention; Figure 6 This is a schematic diagram of the construction of an embedded heat exchange tube type screw pile in soft soil foundation according to the present invention; Figure 7 This is a schematic diagram of the construction of an embedded heat exchange tube type screw pile in hard soil foundation according to the present invention.

[0028] Figure label: 1. Heat exchange pipe; 102. Water inlet pipe; 104. Spiral pipe; 103. Pile top interface; 105. Pile bottom interface; 106. Water outlet pipe; 2. Pile cap; 201. Steel pile cap; 202. Concrete pile cap; 3. Steel thread; 4. Pile body; 5. Pile tip; 501. Steel pile tip; 502. Concrete pile tip; 6. Outer layer of steel structure; 7. Concrete main body; 8. Hollow steel cone; 9. Spiral pile driver; 901. Sleeve. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Specific embodiments of the present invention are described below to facilitate understanding by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various modifications are obvious as long as they fall within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0030] Example 1 like Figure 1-5 As shown, this embodiment provides a screw pile with an embedded heat exchange pipe. This screw pile adopts a steel-concrete composite hollow structure, using the combination of steel and concrete to improve the bearing capacity of the screw pile; and a heat exchange pipe is installed within the steel thread 3, enabling the screw pile to extract geothermal energy; specifically, it includes: 1. Heat exchange pipe; 2. Pile cap; 3. Steel threaded bolt; 4. Pile body; and 5. Pile tip. The pile cap 2 is a disc-shaped structure, with the pile body 4 connected to the bottom of the pile cap 2 and the pile tip 5 connected to the bottom of the pile body 4; steel thread 3 is spirally wound around the pile body 4; heat exchange pipe 1 is inserted into the steel thread 3 and wound around the pile body 4 along the steel thread 3; the pile cap 2 has a hole inside, and both ends of the heat exchange pipe 1 pass through the hole. Specifically, such as Figure 2As shown, the pile body 4 is a conical hollow cylindrical structure with a larger diameter at the top and a smaller diameter at the bottom; the pile body 4 includes a concrete main body 7, with the top and bottom of the concrete main body 7 connected to the pile cap 2 and the pile tip 5 respectively; the outer surface of the concrete main body 7 is wrapped with a steel outer layer 6; the inner surface of the concrete main body 7 is connected with a hollow steel cone 8; the concrete main body 7 is wrapped between the steel outer layer 6 and the hollow steel cone 8. This design not only realizes the hollow structure of the screw pile and saves concrete raw materials, but also improves the load-bearing capacity of the screw pile by combining concrete and steel; the heat exchange pipe 1 is inserted into the steel thread 3. When the screw pile is filled into the soil, the steel thread 3 is in direct contact with the soil, which increases the heat exchange area and improves the heat exchange efficiency.

[0031] Specifically, the holes include inlet holes and outlet holes; such as Figure 2 As shown, the pile body has a pile top interface 103 and a pile bottom interface 105 on its four sides. The pile top interface 103 communicates with the inner cavity of the water inlet hole. Figure 3 As shown, the heat exchange pipe 1 includes an inlet pipe 102, a spiral pipe 104, and an outlet pipe 106. The inlet pipe 102 passes through the inlet hole and the pile top interface 103 in sequence and is connected to one end of the spiral pipe 104. The spiral pipe 104 is housed inside the steel thread 3, and the other end of the spiral pipe 104 is connected to the outlet pipe 106. The outlet pipe 106 passes through the pile bottom interface 105 into the pile body 4 and exits through the outlet hole into the pile cap 2. The spiral pipe 104 is set inside the steel thread 3 and is wound around the pile body 4 along the steel thread 3. The steel thread 3 has good thermal conductivity, and the spiral pipe 104 is set inside it, which can achieve sufficient heat exchange with the soil. Compared with setting the spiral pipe 104 inside the concrete, the heat exchange efficiency is improved, so that the screw pile can fully extract geothermal energy.

[0032] The cross-section of the steel thread 3 is triangular, with one side of the triangular structure abutting against the pile body 4 and forming a closed cavity with the pile body 4; the spiral tube 104 is inserted into the closed cavity; when the cross-section of the steel thread 3 is connected to the pile body 4, one side of the triangular structure is connected to the pile body 4, resulting in a large connection area and a firm connection; in addition, when prefabricating the screw pile, the heat exchange pipe 1 is first placed inside the steel thread 3, and then the steel thread 3 is connected to the pile body 4, which can realize the installation of the heat exchange pipe 1 and the steel thread 3, which is convenient to install and has low prefabrication cost.

[0033] The connection between the pile top interface 103 and the steel thread 3, and the connection between the pile bottom interface 105 and the steel thread 3 are sealed with concrete and sealant to ensure that the heat exchange pipe 1 is enclosed inside the steel thread 3, preventing the soil from directly contacting the heat exchange pipe 1 during pile driving or subsequent loading, thus extending the service life of the pile.

[0034] Specifically, such as Figure 4 and Figure 5As shown, the pile cap 2 includes a steel pile cap 201 and a concrete pile cap 202; the steel pile cap 201 is wrapped around the concrete pile cap 202; the steel pile cap 201 is connected to the top of the outer steel layer 6, and the concrete pile cap 202 is connected to the top of the concrete body 7; the concrete pile cap 202 and the concrete pile body 4 are wrapped by the steel pile cap 201 and the outer steel layer 6, which improves the sealing of the screw pile; and the design of the steel nut allows for the welding of several screw piles together during construction, making the connection convenient and the cost low.

[0035] Specifically, such as Figure 4 and Figure 5 As shown, the pile tip 5 includes a steel pile tip 501 and a concrete pile tip 502, with the steel pile tip 501 encasing the concrete pile tip 502. The steel pile tip 501 is connected to the bottom of the outer steel layer 6, and the concrete pile tip 502 is connected to the bottom of the concrete body 7. When the screw pile is driven into the soil, the steel pile tip 501 directly contacts the soil and drills into it. During this process, the steel pile tip 501 bears most of the settlement resistance of the screw pile. The design of the steel pile tip 501 encasing the concrete pile tip 502 improves the sharpness and wear resistance of the pile tip.

[0036] The thermal conductivity of the outer steel layer 6 ranges from 50 to 80 W / (m·K); the thermal conductivity of the concrete main body 7 ranges from 1.5 to 2 W / (m·K).

[0037] The working principle of this embodiment: The screw pile provided in this embodiment has a hollow steel cone 8 inside the concrete body 7 and a steel outer layer 6 on the outer wall of the concrete body 7. When the screw pile bears a load, the steel outer layer 6, the concrete body 7, and the hollow steel cone 8 share the load pressure. The steel outer layer 6 and the hollow steel cone 8 also hold the concrete body 7 in the middle, preventing it from deforming under pressure, thus providing a strong load-bearing capacity. When extracting geothermal energy, water flows from the inlet pipe 102 into the spiral pipe 104, where it exchanges heat with the soil. After the heat exchange, the water carrying the heat energy flows from the spiral pipe 104 into the outlet pipe 106, and finally flows out from the outlet pipe 106.

[0038] Example 2 like Figure 1-6 As shown, this embodiment, based on the embedded heat exchange tube type 1 screw pile provided in Embodiment 1, provides a construction method for embedded heat exchange tube type 1 screw piles. This construction method involves screwing the screw pile into the screw pile location, which is simple and efficient. Compared with cast-in-place piles, it has less operational difficulty and lower construction cost, and is suitable for installing screw piles on soft soil foundations. It includes the following steps: S1: Determine the screw post location; specifically including: S101: Conduct geological surveys and determine the installation location and depth of the bolt piles based on the survey results; S102: Based on the installation location, mark the pile position control points and control axis to determine the screw pile position.

[0039] S2: Screw the bolt into the bolt post location; specifically including: S201: The spiral pile driver 9 enters the construction site and positions the spiral pile driver 9's pile hole directly above the pile location; S202: As Figure 6 As shown, the sleeve 901 of the auger pile driver 9 is fixed on the pile cap 2 of the screw pile, and the screw pile is lifted by the auger pile driver 9 so that the pile tip 5 of the screw pile is aligned with the screw pile position. S203: Simultaneously use theodolites on the front and side of the auger pile driver 9 to correct the screw pile. The lines connecting the two theodolites and the screw pile are at 90° to each other, so that the screw pile is parallel to the guide rod. S204: Start the auger pile driver 9. The auger pile driver 9 drives the screw pile to rotate and drill into the soil. After the screw pile is drilled to the installation depth, the auger pile driver 9 stops running. S205: Repeat steps S202-S204; install several screw posts at the construction site, and proceed to S206 after installation is completed; S206: Connect several screw posts to form a whole; and connect the heat exchange pipe 1 of several screw posts to the heat pump unit to form a heat circulation system.

[0040] S3: Quality inspection of bolt posts; specifically including: S301: Perform verticality testing on bolted piles and connection strength testing between several bolted piles; S302: Clean up the construction site and dispose of construction waste.

[0041] In this embodiment, the screw pile is fixed to the auger auger 9 by the pile cap 2 of the screw pile, and the auger auger 9 is started to screw the screw pile into the soil. After the screw pile is installed by using this construction method, the connection between the screw pile and the soil is stable. Furthermore, when several screw piles are installed and connected into a whole, each screw pile cooperates with each other to share the load pressure when bearing the load, thereby improving the bearing capacity of the screw pile foundation.

[0042] Example 3 like Figure 1-5 As shown, this embodiment, based on the embedded heat exchange tube type 1 screw pile provided in Embodiment 1, provides a construction method for embedded heat exchange tube type 1 screw piles. This construction method involves drilling a pilot hole before using a auger pile driver 9 to drive the pile, and then installing the screw pile in the pilot hole. It is suitable for installing screw piles on hard soil foundations; it includes the following steps: S1: Determine the screw post location; specifically including: S101: Conduct geological surveys and determine the installation location and depth of the bolt piles based on the survey results; S102: Based on the installation location, mark the pile position control points and control axis to determine the screw pile position; S2: Screw the bolt into the bolt post location; specifically including: S201: The spiral pile driver 9 enters the construction site and positions the spiral pile driver 9's pile hole directly above the pile location; S202: Drill pilot holes at the screw pile locations and clean the mud and debris inside the pilot holes; S203: As Figure 7 As shown, the sleeve 901 of the auger pile driver 9 is fixed on the pile cap 2 of the screw pile, the screw pile is lifted by the auger pile driver 9, and the pile tip 5 of the screw pile is aligned with the pilot hole. S204: Simultaneously use theodolites on the front and side of the auger pile driver 9 to correct the screw pile. The lines connecting the two theodolites and the screw pile are at 90° to each other, so that the screw pile is parallel to the guide rod. S205: Start the auger pile driver 9. The auger pile driver 9 drives the screw pile to rotate and drill into the soil. After the screw pile is drilled to the installation depth, the auger pile driver 9 stops running. S206: Repeat steps S202-S205; install several screw posts at the construction site, and proceed to S206 after installation is completed; S207: Connect several screw posts to form a whole; and connect the heat exchange pipe 1 of several screw posts to the heat pump unit to form a heat circulation system; S3: Quality inspection of bolt posts; specifically including: S301: Perform verticality testing on bolted piles and connection strength testing between several bolted piles; S302: Clean up the construction site and dispose of construction waste.

[0043] In this embodiment, when driving the pile, a pilot hole is first drilled at the pile location, and a pile is installed on the pilot hole. This ensures that when the auger jack 9 drives the pile to rotate, the steel thread 3 of the pile is embedded in the inner wall of the pilot hole, so that the steel thread 3 moves forward spirally relative to the soil when the pile rotates, thus providing traction force for the pile to sink. This construction method is suitable for driving piles in hard foundations.

[0044] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention and should be understood as not limiting the scope of protection of the invention to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed herein without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of the invention.

Claims

1. A type of screw post with an embedded heat exchange tube, characterized in that: The pile includes a heat exchange pipe (1), a pile cap (2), steel thread (3), a pile body (4), and a pile tip (5). The pile cap (2) is a disc structure with holes inside. The pile body (4) is connected to the bottom of the pile cap (2), and the pile tip (5) is connected to the bottom of the pile body (4). The steel thread (3) is coiled around the pile body (4). The heat exchange pipe (1) passes through the steel thread (3) and is coiled around the pile body (4). Both ends of the heat exchange pipe (1) pass through the holes. When the pile is driven into the soil, the steel thread (3) is in direct contact with the soil, increasing the heat exchange area and improving the heat exchange efficiency. The pile body (4) is a conical hollow cylinder structure with a larger diameter at the top and a smaller diameter at the bottom; the pile body (4) includes a concrete body (7), the top and bottom of the concrete body (7) are respectively connected to the pile cap (2) and the pile tip (5); the outer surface of the concrete body (7) is wrapped with a steel structure outer layer (6); the inner surface of the concrete body (7) is connected to a hollow steel cone (8); The holes include inlet holes and outlet holes; the pile body (4) has a pile top interface (103) and a pile bottom interface (105) on its side, and the pile top interface (103) is connected to the inner cavity of the inlet hole; The heat exchange pipe includes an inlet pipe (102), a spiral pipe (104), and an outlet pipe (106); the inlet pipe (102) passes through the inlet hole and the pile top interface (103) in sequence and is connected to one end of the spiral pipe (104); the spiral pipe (104) is housed inside the steel thread (3); the other end of the spiral pipe (104) is connected to the outlet pipe (106); the outlet pipe (106) enters the pile body (4) from the pile bottom interface (105) and exits the pile cap (2) from the outlet hole. The cross-section of the steel thread (3) is a triangular structure, one side of which abuts against the pile body (4) and forms a closed cavity with the pile body (4); the spiral tube (104) passes through the closed cavity.

2. The embedded heat exchange tube type screw post according to claim 1, characterized in that: The connection between the pile top interface (103) and the steel thread (3), and the connection between the pile bottom interface (105) and the steel thread (3) are all sealed with concrete and sealant.

3. The embedded heat exchange tube type screw post according to claim 1, characterized in that: The pile cap (2) includes a steel pile cap (201) and a concrete pile cap (202); the steel pile cap (201) is wrapped around the concrete pile cap (202); the steel pile cap (201) is connected to the top of the outer layer (6) of the steel structure, and the concrete pile cap (202) is connected to the top of the concrete body (7).

4. The embedded heat exchange tube type screw post according to claim 1, characterized in that: The pile tip (5) includes a steel pile tip (501) and a concrete pile tip (502), the steel pile tip (501) being wrapped around the concrete pile tip (502); the steel pile tip (501) being connected to the bottom of the outer layer (6) of the steel structure, and the concrete pile tip (502) being connected to the bottom of the concrete body (7).

5. The embedded heat exchange tube type screw post according to claim 1, characterized in that: The thermal conductivity of the outer steel structure (6) ranges from 50 to 80 W / (m·K); the thermal conductivity of the concrete body (7) ranges from 1.5 to 2 W / (m·K).

6. A type of screw with an embedded heat exchange tube as described in any one of claims 1 to 5. The construction method for piles is characterized by: Includes the following steps: S1: Determine the location of the screw post; S2: Screw in the screw post at the screw post location; S3: Perform quality inspection on the screw post.

7. The construction method of the embedded heat exchange tube type screw pile according to claim 6, characterized in that, S1 includes: S101: Conduct geological surveys and determine the installation location and depth of the bolt piles based on the survey results; S102: Based on the installation location, mark the pile position control points and control axis, and determine the screw pile position; S2 includes: S201: The spiral pile driver (9) enters the construction site and positions the spiral pile hole of the spiral pile driver (9) directly above the screw pile point; S202: Fix the sleeve (901) of the spiral pile machine (9) to the pile cap (2) of the screw pile, and lift the screw pile by the spiral pile machine (9) so that the pile tip (5) of the screw pile is aligned with the screw pile position; S203: Simultaneously use a theodolite on the front and side of the auger pile machine (9) to correct the screw pile, with the lines connecting the two theodolites and the screw pile forming a 90° angle between each other, so that the screw pile is parallel to the guide rod; S204: Start the spiral pile driver (9), which drives the screw pile to rotate and drill into the soil; after the screw pile is drilled to the installation depth, the spiral pile driver (9) stops running; S205: Repeat steps S202-S204; install several of the aforementioned screw posts at the construction site, and proceed to S206 after installation is completed; S206: Connect several of the screw posts to form a whole; and connect the heat exchange tubes (1) of several of the screw posts to the heat pump unit to form a heat circulation system; S3 includes: S301: Perform verticality testing on the screw piles and connection strength testing between several screw piles; S302: Clean up the construction site and dispose of construction waste.

8. The construction method of the embedded heat exchange tube type screw pile according to claim 6, characterized in that, S1 includes: S101: Conduct geological surveys and determine the installation location and depth of the bolt piles based on the survey results; S102: Based on the installation location, mark the pile position control points and control axis, and determine the screw pile position; S2 includes: S201: The spiral pile driver (9) enters the construction site and positions the spiral pile hole of the spiral pile driver (9) directly above the screw pile point; S202: Drill pilot holes at the screw pile location; and clean the mud and debris inside the pilot holes; S203: Fix the sleeve (901) of the spiral pile machine (9) to the pile cap (2) of the screw pile, lift the screw pile by the spiral pile machine (9), and align the pile tip (5) of the screw pile with the pilot hole; S204: Simultaneously use a theodolite on the front and side of the auger (9) to correct the screw pile, with the lines connecting the two theodolites and the screw pile forming a 90° angle between each other, so that the screw pile is parallel to the guide rod; S205: Start the spiral pile driver (9), which drives the screw pile to rotate and drill into the soil; after the screw pile is drilled to the installation depth, the spiral pile driver (9) stops running; S206: Repeat steps S202-S205; install several of the aforementioned screw posts at the construction site, and proceed to S207 after installation is completed; S207: Connect several of the screw posts to form a whole; and connect the heat exchange tubes (1) of several of the screw posts to the heat pump unit to form a heat circulation system; S3 includes: S301: Perform verticality testing on the screw piles and connection strength testing between several screw piles; S302: Clean up the construction site and dispose of construction waste.

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