CN109083159B - A kind of cast-in-place reinforced concrete horizontal enclosure energy pile and its construction method - Google Patents

Abstract

A cast-in-situ reinforced concrete horizontal containment energy pile and a construction method thereof.A plurality of back soil side U-shaped heat exchange tubes are arranged at intervals on the back soil side in the pile body, and a plurality of earth facing side U-shaped heat exchange tubes are arranged at intervals on the earth facing side in the pile body; the pile body is internally provided with a heat insulation plate for insulating heat exchange between the back soil side U-shaped heat exchange tube and the earth facing side U-shaped heat exchange tube; two pipe orifices of the back soil side U-shaped heat exchange pipe are respectively communicated with a first inlet of the hot water tank and a first outlet of the hot water tank; two pipe orifices of the U-shaped heat exchange pipe on the earth facing side are respectively communicated with a first inlet of the cold water tank and a first outlet of the cold water tank; the second inlet of the hot water tank and the second outlet of the hot water tank are respectively communicated with the inlet and the outlet of a cooling and heating pipeline for cooling and heating the building; the second inlet of the cold water tank and the second outlet of the cold water tank are respectively communicated with the inlet and the outlet of a pipeline for cooling and heating the building.

Description

A kind of cast-in-place reinforced concrete horizontal enclosure energy pile and its construction method

technical field

The invention belongs to the field of pile foundation engineering, and in particular relates to a cast-in-place reinforced concrete horizontal enclosure energy pile and a construction method.

Background technique

Based on the consideration of the use of underground space, engineers and technicians combined ground source heat pumps with building pile foundations to propose a technical solution for energy piles. Through the heat exchange tubes buried in the pile foundation, the shallow low-temperature geothermal energy conversion is carried out, and the heat exchange with the shallow ground energy can be realized through the pile body while satisfying the mechanical functions of the conventional pile foundation.

The energy pile is used as the foundation pit horizontal protection pile, because the energy pile system can provide temperature stress during the excavation stage of the foundation pit, and can be used to resist the horizontal deformation of the pile body. In the stage of structural use, it can also be used as an ordinary energy pile to convert shallow geothermal energy, so that one pile can be used for multiple purposes.

For safety reasons, compared with energy piles that are generally used for vertical bearing, not only does it not generate temperature stress that is unfavorable to the bearing capacity, but also generates favorable temperature stress that resists the horizontal deformation of the pile body, which increases the reliability of the structure. For construction considerations, compared with ordinary bored piles, there is only one more step of binding heat exchange tubes and heat insulation panels, which is simple in construction and easy to use. Out of economic considerations, the enclosure piles are discarded after the foundation pit is completed, and turned into energy piles to provide cooling and heating for surrounding buildings, realizing turning waste into treasure, and having good economic benefits. In addition, the horizontal enclosure energy piles can generate temperature stress and resist deformation during the excavation stage of the foundation pit, so the pile length can be reduced to a certain extent and the cost can be saved.

Chinese patent CN105350522A discloses a method of making and using a prefabricated reinforced concrete energy pile system, which can convert shallow low-temperature geothermal energy and provide heat for surrounding buildings. However, this type of pile is mostly used as a vertical load-bearing pile, subject to vertical bearing capacity, and when the energy pile is in operation, the pile generates temperature stress that is unfavorable to the bearing capacity, which is not conducive to the stability of the pile. Moreover, such piles do not arrange the position of the heat exchange tubes reasonably, so they cannot be used to reduce the horizontal deformation of the pile body.

Chinese patent CN105113486A discloses a bored cast-in-situ pile used in the field of foundation pit enclosure and slope support. During the construction stage, there is no temperature stress to reduce the horizontal displacement of the pile. And after foundation pit construction is finished, pile has just lost its effect, can be abandoned, causes bigger waste.

Contents of the invention

In order to solve the disadvantage that the existing energy piles cannot resist the horizontal deformation of the pile body, the present invention provides a cast-in-place reinforced concrete horizontal enclosure energy pile and a construction method, which can not only resist the horizontal deformation of the pile body during the excavation stage of the foundation pit, but also can reuse the discarded piles after the foundation pit is completed, and perform shallow low-temperature geothermal energy conversion to provide cooling and heating for surrounding buildings.

The technical scheme adopted in the present invention is:

The embodiment of the present application provides a cast-in-situ reinforced concrete horizontal enclosure energy pile, which includes a pile body inserted in the foundation pit, the bottom end of the pile body along the axial direction is fixedly embedded in the soil body of the foundation pit, and the top end of the pile body along the axial direction extends vertically upward;

The pile body is embedded with a reinforcement cage, the back soil side of the pile body is provided with several U-shaped heat exchange tubes at intervals, and the soil-facing side of the pile body is provided with several U-shaped heat exchange tubes at intervals; and the U-shaped heat exchange tubes on the back-soil side and the U-shaped heat exchange tubes on the soil-facing side are fixedly arranged on the steel cage;

The pile body is provided with a heat insulation plate for isolating the U-shaped heat exchange tube on the back soil side and the U-shaped heat exchange tube on the soil-facing side from exchanging heat, and the heat insulation plate is inserted between the U-shaped heat exchange tube on the back-soil side and the U-shaped heat exchange tube on the soil-facing side;

Both the tube bottoms of the U-shaped heat exchange tubes on the back-soil side and the tube bottoms of the U-shaped heat exchange tubes on the soil-facing side are located in the pile body, and the two nozzles of the U-shaped heat exchange tubes on the back-soil side and the two nozzles of the U-shaped heat exchange tubes on the soil-facing side both penetrate the top surface of the pile body along the axial direction;

The two nozzles of the U-shaped heat exchange tubes on the back soil side are respectively connected with the first inlet of the hot water tank and the first outlet of the hot water tank, and each of the U-shaped heat exchange tubes on the back soil side forms a first circulation loop with the hot water tank; a first water pump is connected in series on the first circulation loop, and the first water pump is located outside the pile body;

The two nozzles of the U-shaped heat exchange tubes on the soil-facing side are respectively connected with the first inlet of the cold water tank and the first outlet of the cold water tank; and each U-shaped heat exchange tube on the soil-facing side forms a second circulation loop with the cold water tank; a second water pump is connected in series on the second circulation loop, and the second water pump is located outside the pile body;

The hot water tank is provided with a first injection port for injecting the first heat transfer fluid into the hot water tank and a first discharge port for discharging the first heat transfer fluid; the cold water tank is provided with a second injection port for injecting the second heat transfer fluid into the cold water tank and a second discharge port for discharging the second heat transfer fluid in the cold water tank;

The second inlet of the hot water tank and the second outlet of the hot water tank are respectively connected with the inlet and outlet of the heating and cooling pipeline for heating and cooling the building;

The second inlet of the cold water tank and the second outlet of the cold water tank are respectively connected with the inlet and outlet of the pipeline for heating and cooling the building;

And the second inlet of the hot water tank, the second outlet of the hot water tank, the second inlet of the cold water tank and the second outlet of the cold water tank are respectively provided with switches.

Further, both the first heat transfer fluid and the second heat transfer fluid are water.

Further, the heat insulation board is arranged in the middle of the pile body along the axial direction.

Further, two U-shaped heat exchange tubes are arranged at intervals on the side facing the soil in the pile body, and two U-shaped heat exchange tubes are arranged at intervals on the side facing the soil in the pile body; and the U-shaped heat exchange tubes on the back-soil side and the U-shaped heat exchange tubes on the soil-facing side are respectively arranged symmetrically on both sides of the heat insulation board.

The embodiment of the present application also provides a construction method for cast-in-place reinforced concrete horizontal enclosure energy piles, comprising the following steps:

(1) Install a reinforcement cage in the foundation pit, fix several U-shaped heat exchange tubes on the back soil side on the back soil side of the reinforcement cage, and the two nozzles of the U-shaped heat exchange tubes on the back soil side are respectively exposed on the upper end of the reinforcement cage; fix several U-shaped heat exchange tubes on the soil-facing side respectively on the soil-facing side of the reinforcement cage, and the two nozzles of the U-shaped heat exchange tubes on the soil-facing side are respectively exposed on the upper end of the reinforcement cage;

A heat insulation board is installed on the reinforcement cage, and the heat insulation board is fixed on the reinforcement cage between the U-shaped heat exchange tube on the back soil side and the U-shaped heat exchange tube on the soil-facing side;

(2) pouring concrete on the reinforcement cage to form a pile body, and the two nozzles of the U-shaped heat exchange tube on the back soil side and the two nozzles of the U-shaped heat exchange tube on the soil-facing side are respectively exposed on the upper end of the pile body;

(3) arrange the hot water tank and the cold water tank outside the pile;

The two nozzles of the U-shaped heat exchange tube on the back side of the soil are respectively connected with the first inlet of the hot water tank and the first outlet of the hot water tank, and each of the U-shaped heat exchange tubes on the back side of the soil forms a first circulation loop with the hot water tank;

The two nozzles of the U-shaped heat exchange tube on the soil-facing side are respectively connected to the first inlet of the cold water tank and the first outlet of the cold water tank, and each of the U-shaped heat exchange tubes on the soil-facing side forms a second circulation loop with the cold water tank;

(4) In the excavation stage of the foundation pit, inject the hot first heat transfer fluid into the hot water tank, and the temperature of the first heat transfer fluid is higher than the temperature of the pile body in the foundation pit and the formation around the pile body; Inject the cold second heat transfer fluid into the cold water tank, and the temperature of the second heat transfer fluid is lower than the temperature of the pile body in the foundation pit and the formation around the pile body;

Since the temperature of the first heat transfer fluid is higher than the temperature of the pile body in the foundation pit and the formation around the pile body, the first heat transfer fluid will cause the back soil side of the pile body to expand and generate temperature stress, thereby resisting the deformation of the pile body during the excavation process of the foundation pit;

Since the temperature of the second heat-conducting fluid is lower than the temperature of the pile body in the foundation pit and the strata around the pile body, the second heat-conducting fluid will shrink the side facing the soil of the pile body and generate temperature stress, thereby resisting the deformation of the pile body during the excavation of the foundation pit;

(5) After the excavation of the foundation pit is completed, inject normal temperature water into both the hot water tank and the cold water tank, and open the switches on the second inlet of the hot water tank, the second outlet of the hot water tank, the second inlet of the cold water tank, and the second outlet of the cold water tank;

In summer, when the heating and cooling pipeline supplies cooling to the building, the normal temperature water in the hot water tank and the cold water tank is cooled by the ground temperature energy in the pile body and the ground around the pile body through the first circulation loop and the second circulation loop respectively, and the cooled normal temperature water flows into the heating and cooling pipeline to supply cooling to the building;

In winter, when the heating and cooling pipeline is heating the building, the normal temperature water in the hot water tank and the cold water tank are heated by the ground temperature energy in the pile body and the ground around the pile body through the first circulation loop and the second circulation loop respectively, and the heated normal temperature water flows into the heating and cooling pipeline to heat the building.

The beneficial effects of the present invention are reflected in:

1. During the excavation stage of the foundation pit, cold water circulation is used on the soil facing surface (tension side) to make the pile body shrink, and hot water circulation is used on the back soil side (pressure side) to make the pile body expand. The temperature stress generated by the temperature is used to resist the horizontal stress on the horizontal enclosure pile during foundation pit excavation and reduce the deformation of the enclosure pile.

2. After the construction is completed, the discarded piles can be used as ordinary energy piles, so as to transfer the temperature of the underground constant temperature layer to the upper structure, make full use of geothermal resources, and make the upper structure achieve the effect of "warm in winter and cool in summer".

3. One pile of the present invention is multi-purpose. It can not only reduce the horizontal deformation of the pile body during the excavation stage of the foundation pit, but also use the discarded enclosure piles as energy piles after construction, so as to achieve the purpose of turning waste into treasure. The material is simple, easy to install, easy to control, and energy saving. It has a wide range of application prospects.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention in an embodiment.

Fig. 2 is a top view of the pile body in one embodiment.

Fig. 3 is a schematic structural view of a U-shaped heat exchange tube on the back side of the soil or a U-shaped heat exchange tube on the side facing the soil in an embodiment.

Fig. 4 is a schematic diagram of the working principle of the energy pile of the present invention in the excavation stage of the foundation pit in an embodiment, wherein the arrows in the pile body indicate the direction of water flow.

Detailed ways

The technical solution of the patent of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, or it may be an internal connection between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Referring to the drawings, this embodiment provides a cast-in-place reinforced concrete horizontal enclosure energy pile, including a pile body 2 inserted in the foundation pit 1, the bottom end of the pile body 2 along the axial direction is fixedly embedded in the soil body of the foundation pit 1, and the top end of the pile body 2 extends vertically upward along the axial direction;

Specifically, the pile body 2 is a cast-in-place reinforced concrete pile, the length of the pile body 2 is 25-35 cm, and the pile diameter of the pile body 2 is 40-100 cm. The pile body is cylindrical. The axial direction in this embodiment refers to the central axis direction of the pile body 2 .

A reinforcement cage 5 is embedded in the pile body 2, and several U-shaped heat exchange tubes 3 on the back soil side are arranged at intervals on the back side of the pile body 2, and several U-shaped heat exchange tubes 4 on the side facing the soil are arranged at intervals on the side facing the soil in the pile body 2;

The pile body is provided with a heat insulating plate 6 for isolating the U-shaped heat exchange tube 3 on the back-soil side and the U-shaped heat exchange tube 4 on the soil-facing side from exchanging heat, and the heat insulating plate 6 is inserted between the U-shaped heat exchange tube 3 on the back-soil side and the U-shaped heat exchange tube 4 on the soil-facing side;

Further, the heat insulation board 6 is arranged in the middle of the pile body 2 along the axial direction.

Further, the length of the heat insulating board 6 is two-thirds of the length of the pile body 2 , and the top of the heat insulating board 6 is flush with the top of the pile body 2 .

Further, two U-shaped heat exchange tubes 3 on the back side of the pile body 2 are arranged at intervals on the side facing the soil, and two U-shaped heat exchange tubes 4 on the side facing the soil are arranged at intervals on the side facing the soil in the pile body 2;

The tube bottom of the U-shaped heat exchange tube 3 on the back side of the soil and the tube bottom of the U-shaped heat exchange tube 4 on the side facing the soil are both located in the pile body 2, and the two nozzles of the U-shaped heat exchange tube 3 on the back-soil side and the two nozzles of the U-shaped heat exchange tube 4 on the soil-facing side all pass through the top surface of the pile body 2 along the axial direction;

The two nozzles of the U-shaped heat exchange tubes 3 on the back soil side are connected with the first inlet of the hot water tank 11 and the first outlet of the hot water tank 11 respectively, and each of the U-shaped heat exchange tubes 3 on the back soil side forms a first circulation loop with the hot water tank 11; a first water pump 8 is connected in series on the first circulation loop, and the first water pump 8 is located outside the pile body 2;

The two nozzles of the U-shaped heat exchange tubes 4 on the soil-facing side are respectively connected to the first inlet of the cold water tank 12 and the first outlet of the cold water tank; and each U-shaped heat exchange tube 4 on the soil-facing side forms a second circulation loop with the cold water tank 12; a second water pump 7 is connected in series on the second circulation loop, and the second water pump 7 is located outside the pile body 2;

Further, one nozzle of the U-shaped heat exchange tube 3 on the back soil side communicates with the inlet of the hot water tank 11 through a first water pipe, and a first water pump is arranged in series on the first water pipe.

Further, one nozzle of the U-shaped heat exchange tube 4 on the soil-facing side communicates with the inlet of the cold water tank 12 through a second water pipe, and a second water pump is arranged in series on the second water pipe.

The hot water tank 11 is provided with a first injection port for injecting the first heat transfer fluid into the hot water tank 11 and a first discharge port for discharging the first heat transfer fluid in the hot water tank 11; the cold water tank 12 is provided with a second injection port for injecting the second heat transfer fluid into the cold water tank 12 and a second discharge port for discharging the second heat transfer fluid in the cold water tank 12;

Further, the hot water tank 11 is provided with a heater for heating the first heat transfer fluid in the hot water tank, and the cold water tank is provided with a cooler for cooling the second heat transfer fluid in the cold water tank.

The second inlet of the hot water tank 11 and the second outlet of the hot water tank communicate with the inlet and outlet of the heating and cooling pipelines for heating and cooling the building 14, respectively;

The second inlet of the cold water tank 12 and the second outlet of the cold water tank 12 communicate with the inlet and outlet of the pipeline for heating and cooling of the building 14 respectively;

Specifically, the hot water tank 11 and the cold water tank 12 communicate with the heating and cooling pipelines of the building 14 through the pipeline 13 .

And the second inlet of the hot water tank 11 , the second outlet of the hot water tank 11 , the second inlet of the cold water tank 12 and the second outlet of the cold water tank 12 are respectively provided with switches.

Further, both the first heat transfer fluid and the second heat transfer fluid are water.

Specifically, the diameters of the U-shaped heat exchange tubes 3 on the back side of the soil and the U-shaped heat exchange tubes 4 on the side facing the soil are 5-15 cm.

The construction method of a kind of cast-in-place reinforced concrete horizontal enclosure energy pile described in this embodiment comprises the following steps:

(1) Install the reinforced cage 5 in the foundation pit 1, and fix the U -shaped heat exchanges of several back soil side on the side soil side of the back soil of the reinforced cage 5, and the two pipe ports of the back soil side U -shaped thermal pipe 3 are exposed to the upper end of the reinforced cage 5; And the two pipe ports of the U -shaped heat exchanging pipe 4 of the soil side are exposed to the upper end of the steel cage 5;

A heat insulation board 6 is installed on the steel cage 5, and the heat insulation board 6 is fixed on the steel cage between the U-shaped heat exchange tube 3 on the back soil side and the U-shaped heat exchange tube 4 on the soil-facing side; the U-shaped heat exchange tube 3 on the back soil side and the U-shaped heat exchange tube 4 on the soil-facing side are symmetrical about the heat insulation plate 6;

(2) Concrete is poured on the reinforcement cage 5 to form the pile body 2, and two nozzles of the U-shaped heat exchange tube on the back soil side and two nozzles of the U-shaped heat exchange tube on the soil-facing side are respectively exposed on the upper end of the pile body;

(3) arrange the hot water tank 11 and the cold water tank 12 outside the pile body 2;

The two nozzles of the U-shaped heat exchange tubes 3 on the back soil side are connected to the first inlet of the hot water tank 11 and the first outlet of the hot water tank 11 respectively, and each of the U-shaped heat exchange tubes 3 on the back soil side forms a first circulation loop with the hot water tank 11;

The two nozzles of the U-shaped heat exchange tubes 4 on the soil-facing side are respectively connected to the first inlet of the cold water tank 12 and the first outlet of the cold water tank 12, and each of the U-shaped heat exchange tubes 4 on the soil-facing side forms a second circulation loop with the cold water tank 12 respectively.

(4) In the foundation pit excavation stage, inject hot first heat transfer fluid into the hot water tank 11, and the temperature of the first heat transfer fluid is higher than the pile body 2 in the foundation pit 1 and the temperature of the pile body 2 surrounding stratum; Inject the cold described second heat transfer fluid into the cold water tank 12, and the temperature of the second heat transfer fluid is lower than the pile body 2 in the foundation pit 1 and the temperature of the pile body 2 surrounding formations;

Since the temperature of the first heat transfer fluid is higher than the temperature of the pile body 2 in the foundation pit 1 and the strata around the pile body 2, the first heat transfer fluid will cause the back soil side of the pile body 2 to expand and generate temperature stress, thereby resisting the deformation of the pile body 2 during the excavation process of the foundation pit 1;

Since the temperature of the second heat-conducting fluid is lower than the temperature of the pile body 2 in the foundation pit and the strata around the pile body 2, the second heat-conducting fluid will cause the side facing the soil of the pile body 2 to shrink and generate temperature stress, thereby resisting deformation of the pile body 2 during the excavation process of the foundation pit 1;

(5) After foundation pit 1 excavation finishes, all inject normal temperature water in described hot water tank 11 and described cold water tank 12, and open the switch on the second inlet of described hot water tank 11, the second outlet of described hot water tank 11, the second inlet of described cold water tank 12 and the second outlet of described cold water tank 12;

In summer, when the heating and cooling pipeline supplies cooling to the building 14, the normal temperature water in the hot water tank 11 and the cold water tank 12 is cooled by the ground temperature energy in the pile body 2 and the strata around the pile body 2 through the first circulation loop and the second circulation loop respectively, and the cooled normal temperature water flows into the heating and cooling pipeline to supply cooling to the building 14;

In winter, when the heating and cooling pipeline is heating the building 14, the normal temperature water in the hot water tank 11 and the cold water tank 12 is heated by the ground temperature energy in the pile body 2 and the strata around the pile body 2 through the first circulation loop and the second circulation loop respectively, and the heated normal temperature water flows into the heating and cooling pipeline to heat the building 14.

The U-shaped heat exchange tube 3 on the back side of the soil and the U-shaped heat exchange tube 4 on the side facing the soil are bound on the steel cage 5 with the center of the pile body as a symmetrical point, and the heat insulation plate 6 is bound on the symmetrical axis of the two heat exchange tubes 3 and 4.

When used in the foundation pit excavation stage: as shown in Figure 2, the U-shaped heat exchange tube 3 on the back soil side (pressure side) passes hot water, and the temperature of the hot water water is higher than the temperature of the pile body 2 and the surrounding strata.

Pass cold water through the U-shaped heat exchange tube 4 on the soil-facing side (tension side) of the pile body, and the temperature of the cold water is lower than the temperature of the pile body 2 and the surrounding stratum. During the heat transfer process, the soil-facing side of the pile body 2 will shrink, generate temperature stress, and resist the deformation of the pile body caused by excavation of the foundation pit.

The heat insulation board 6 arranged in the middle of the pile body prevents the U-shaped heat exchange tube 3 on the back side of the soil and the U-shaped heat exchange tube 4 on the side facing the soil from generating radial heat exchange inside the pile body.

After the construction of foundation pit 1 is completed, normal temperature water is used in both the hot water tank and the cold water tank. The water flows through the underground constant temperature layer through the heat exchange pipe, and the water temperature changes, thereby achieving the function of cooling and heating the building 14.

The content described in the embodiment of this specification is only an example of the implementation form of the inventive concept, and the protection scope of the present invention should not be regarded as limited to the specific form stated in the embodiment, and the protection scope of the present invention also covers equivalent technical means that those skilled in the art can think of according to the inventive concept.

Claims (5)

1. A cast-in-situ reinforced concrete horizontal enclosure energy pile is characterized in that: comprise a pile body inserted in the foundation pit, the bottom end of the pile body along the axial direction is fixedly embedded in the soil body of the foundation pit, and the top end of the pile body along the axial direction extends vertically upwards; The pile body is embedded with a reinforcement cage, the back soil side of the pile body is provided with several U-shaped heat exchange tubes at intervals, and the soil-facing side of the pile body is provided with several U-shaped heat exchange tubes at intervals; and the U-shaped heat exchange tubes on the back-soil side and the U-shaped heat exchange tubes on the soil-facing side are fixedly arranged on the steel cage; The pile body is provided with a heat insulation plate for isolating the U-shaped heat exchange tube on the back-soil side and the U-shaped heat exchange tube on the soil-facing side from exchanging heat, and the heat insulation plate is inserted between the U-shaped heat exchange tube on the back-soil side and the U-shaped heat exchange tube on the soil-facing side; Both the tube bottoms of the U-shaped heat exchange tubes on the back-soil side and the tube bottoms of the U-shaped heat exchange tubes on the soil-facing side are located in the pile body, and the two nozzles of the U-shaped heat exchange tubes on the back-soil side and the two nozzles of the U-shaped heat exchange tubes on the soil-facing side both penetrate the top surface of the pile body along the axial direction; The two nozzles of the U-shaped heat exchange tubes on the back soil side are respectively connected with the first inlet of the hot water tank and the first outlet of the hot water tank, and each of the U-shaped heat exchange tubes on the back soil side forms a first circulation loop with the hot water tank; a first water pump is connected in series on the first circulation loop, and the first water pump is located outside the pile body; The two nozzles of the U-shaped heat exchange tubes on the soil-facing side are respectively connected with the first inlet of the cold water tank and the first outlet of the cold water tank; and each U-shaped heat exchange tube on the soil-facing side forms a second circulation loop with the cold water tank; a second water pump is connected in series on the second circulation loop, and the second water pump is located outside the pile body; The hot water tank is provided with a first injection port for injecting the first heat transfer fluid into the hot water tank and a first discharge port for discharging the first heat transfer fluid; the cold water tank is provided with a second injection port for injecting the second heat transfer fluid into the cold water tank and a second discharge port for discharging the second heat transfer fluid in the cold water tank; The second inlet of the hot water tank and the second outlet of the hot water tank are respectively connected with the inlet and outlet of the heating and cooling pipeline for heating and cooling the building; The second inlet of the cold water tank and the second outlet of the cold water tank communicate with the inlet and outlet of the pipeline for heating and cooling the building respectively; And the second inlet of the hot water tank, the second outlet of the hot water tank, the second inlet of the cold water tank and the second outlet of the cold water tank are respectively provided with switches. 2. The cast-in-place reinforced concrete horizontal enclosure energy pile according to claim 1, wherein both the first heat transfer fluid and the second heat transfer fluid are water. 3. The cast-in-place reinforced concrete horizontal enclosure energy pile according to claim 1, characterized in that: the heat insulation board is arranged in the middle of the pile body along the axial direction. 4. A kind of cast-in-place reinforced concrete horizontal enclosure energy pile as claimed in claim 1, characterized in that: the back soil side in the pile body is provided with two U-shaped heat exchange tubes at the back soil side at intervals, and the soil-facing side in the pile body is provided with two U-shaped heat exchange tubes at the soil-facing side at intervals; and the U-shaped heat exchange tubes at the back-soil side and the U-shaped heat exchange tubes at the soil-facing side are respectively symmetrically arranged on both sides of the heat shield. 5. The construction method of a kind of cast-in-place reinforced concrete horizontal enclosure energy pile as described in any one of claims 1 to 4, is characterized in that, comprises the following steps: (1) Install a reinforcement cage in the foundation pit, fix several U-shaped heat exchange tubes on the back soil side on the back soil side of the reinforcement cage, and the two nozzles of the U-shaped heat exchange tubes on the back soil side are respectively exposed on the upper end of the reinforcement cage; fix several U-shaped heat exchange tubes on the soil-facing side respectively on the soil-facing side of the reinforcement cage, and the two nozzles of the U-shaped heat exchange tubes on the soil-facing side are respectively exposed on the upper end of the reinforcement cage; A heat insulation board is installed on the steel cage, and the heat insulation board is fixed on the steel cage between the U-shaped heat exchange tube on the back soil side and the U-shaped heat exchange tube on the soil facing side; (2) pouring concrete on the reinforcement cage to form a pile body, and the two nozzles of the U-shaped heat exchange tube on the back side of the soil and the two nozzles of the U-shaped heat exchange tube on the side facing the soil are respectively exposed on the upper end of the pile body; (3) arranging the hot water tank and the cold water tank outside the pile body; The two nozzles of the U-shaped heat exchange tube on the back side of the soil are respectively connected with the first inlet of the hot water tank and the first outlet of the hot water tank, and each of the U-shaped heat exchange tubes on the back side of the soil forms a first circulation loop with the hot water tank; The two nozzles of the U-shaped heat exchange tube on the soil-facing side are respectively connected to the first inlet of the cold water tank and the first outlet of the cold water tank, and each of the U-shaped heat exchange tubes on the soil-facing side forms a second circulation loop with the cold water tank; (4) In the excavation stage of the foundation pit, inject the hot first heat transfer fluid into the hot water tank, and the temperature of the first heat transfer fluid is higher than the temperature of the pile body in the foundation pit and the formation around the pile body; Inject the cold second heat transfer fluid into the cold water tank, and the temperature of the second heat transfer fluid is lower than the temperature of the pile body in the foundation pit and the formation around the pile body; Since the temperature of the first heat transfer fluid is higher than the temperature of the pile body in the foundation pit and the formation around the pile body, the first heat transfer fluid will cause the back soil side of the pile body to expand and generate temperature stress, thereby resisting the deformation of the pile body during the excavation process of the foundation pit; Since the temperature of the second heat-conducting fluid is lower than the temperature of the pile body in the foundation pit and the strata around the pile body, the second heat-conducting fluid will shrink the side facing the soil of the pile body and generate temperature stress, thereby resisting the deformation of the pile body during the excavation of the foundation pit; (5) After the excavation of the foundation pit is completed, inject normal temperature water into both the hot water tank and the cold water tank, and open the switches on the second inlet of the hot water tank, the second outlet of the hot water tank, the second inlet of the cold water tank, and the second outlet of the cold water tank; In summer, when the heating and cooling pipeline supplies cooling to the building, the normal temperature water in the hot water tank and the cold water tank is cooled by the ground temperature energy in the pile body and the ground around the pile body through the first circulation loop and the second circulation loop respectively, and the cooled normal temperature water flows into the heating and cooling pipeline to supply cooling to the building; In winter, when the heating and cooling pipeline is heating the building, the normal temperature water in the hot water tank and the cold water tank are heated by the ground temperature energy in the pile body and the ground around the pile body through the first circulation loop and the second circulation loop respectively, and the heated normal temperature water flows into the heating and cooling pipeline to heat the building.