JP4047972B2 - Heat exchange pile and heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanging pile that is buried in the ground and absorbs geothermal heat, and a heating device that heats or melts snow by circulating a heat medium that absorbs the geothermal heat in a heat radiation block installed on the ground surface.
[0002]
[Prior art]
Conventionally, heat exchange piles have been buried in the ground to absorb geothermal heat, and attempts have been made to use the heat medium that has absorbed this geothermal heat on the surface, as a mechanism that suppresses the use of artificial heat sources as much as possible. It is used for melting snow and heating.
[0003]
As a heat exchanging pile buried in the ground, in Japanese Patent Laid-Open No. 60-8659, a U-shaped heat exchanging pipe is inserted into a hollow portion of a concrete foundation pile, and the heat exchanging pipe and the hollow portion Disclosed is a structure in which a space portion is filled with an appropriate material having good heat conduction, and by heating a heat medium heated by geothermal heat in the heat exchange pipe, heating or melting snow is performed on the surface. It is what you want to do.
[0004]
However, the heat exchanging pile described in JP-A-60-8659 is simply a U-shaped heat exchanging pipe embedded in the center of the pile. The endothermic area of the pipe is small. Therefore, the heat exchange pipe is located far from the outer periphery of the pile, and the whole is surrounded by the filled material. Since it is a thing of a structure, there exists a problem that the absorption efficiency of geothermal heat is bad.
[0005]
As a solution to such a problem, Japanese Patent Laid-Open No. 3-83226 discloses that a heat absorption pipe on the spiral heat medium inflow side is embedded in a concrete layer of a concrete hollow pile, and the lower end of the heat absorption pipe is The foundation pile which has the heat exchange function of the structure which led the connected outflow pipe of the heat-medium outflow side to the upper part of the pile by raising the hollow part of the hollow pile linearly is disclosed.
[0006]
[Problems to be solved by the invention]
By adopting the heat exchange pile having the configuration disclosed in Japanese Patent Laid-Open No. 3-83226, the heat absorption area of the heat exchange pipe is larger than that disclosed in Japanese Patent Laid-Open No. 60-8659, and the geothermal heat There are various effects such as improved absorption efficiency. However, in such a configuration, there is a certain limit to increase the heat absorption area of the heat absorption pipe in the heat exchange pipe.
[0007]
Therefore, in order to ensure a wider heat radiation range, it is necessary to increase the number of concrete hollow piles or to add heat necessary for heat radiation to the heat medium using other heating devices. However, increasing the number of buried piles increases the number of piles and the amount of construction work, so there are problems such as an increase in material costs and work costs, and an increase in work time. Furthermore, if a heating device or the like is added, more artificial heat energy is used, and there is a problem that it is far from the intention of achieving the original purpose.
[0008]
[Means for Solving the Problems]
The present invention was made to solve the conventional problems as described above, and aims to provide a pile having a limited volume capable of absorbing as much geothermal heat as possible. The gist is that the thick part of the hollow hollow pile made of concrete is a spiral part in which the forward pipe and the return pipe through which the heat medium flows are alternately wound, and the upper part is opened or opened at the upper end surface of the hollow pile. A heat exchange pipe composed of a water flow portion projecting from the upper end surface is embedded, and both the forward pipe and the return pipe of the spiral part through which the heat medium flows are formed by a bellows-like pipe. It exists in the heat exchange pile and heating apparatus characterized by having performed.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In the figure, A is a heat exchange pile, a hollow pile 1 made of reinforced concrete, and a heat exchange pipe 2 embedded in a thick portion of the hollow pile 1. It consists of and. The hollow pile 1 has an outer diameter of 200 mm, an inner diameter of 90 mm, and a length of 3000 mm in the embodiment, and the heat exchange pipe 2 is in the embodiment shown in FIGS. The spiral portion 3 wound in a coil shape and two linear water passage portions 4 are configured.
[0010]
As shown in FIG. 2, the spiral portion 3 is formed by bending the center of a straight pipe 5 having a length of about 12000 mm into a circular shape 5 a having a smaller diameter than the outer shape of the hollow pile 1. After the pipe 5b and the return pipe 5c are respectively formed, the pipes 5b and 5c are wound in the same direction and concentrically in a spiral shape, and as shown in FIG. 3, the forward pipe 5b and the return pipe 5c are wound. Are formed in a spiral shape, and male threads 5d are formed at the free ends of the pipes 5b and 5c, respectively.
[0011]
On the other hand, the two water passing portions 4 are composed of straight pipes and large-diameter cylindrical portions 4a and 4b provided at both ends thereof, and the large-diameter cylindrical portions 4a and 4b are provided inside the large-diameter cylindrical portions 4a and 4b. Is engraved with female threads. Then, the heat exchange pipe 2 is configured by screwing the male screw 5d of the spiral portion 3 into this female screw and connecting the spiral portion 3 and the water passage portion 4. Here, the heat exchange pipe 2 is separated into a spiral portion 3 and a water passage portion 4, which is configured to be separated due to the manufacturing relationship of the spiral portion 3. The thing of the integral structure which formed the spiral part 3 and the water flow part 4 with the straight pipe may be sufficient.
[0012]
The heat exchange pipe 2 may be a resin pipe such as a hard vinyl chloride pipe, a metal pipe such as a stainless steel pipe, a copper pipe, or an iron pipe, but stainless steel from the viewpoint of thermal conductivity and corrosion resistance. Those made of are preferred. Further, as shown in FIG. 4, the heat exchange pipe 2 uses a bellows pipe (flexible pipe) whose tube wall shape is corrugated in the length direction, thereby facilitating an increase in heat absorption area and bending. Yes. Therefore, the surface area of the heat exchange pipe 2 becomes very large due to the spiral shape and the bellows shape, so that the heat absorption capacity can be increased and a wide range of heat can be kept on the ground surface.
[0013]
Next, an embodiment applied to a snow melting device as a heating device employing the heat exchange pile A composed of the reinforced concrete hollow pile 1 and the heat exchange pipe 2 will be described with reference to FIG. A rectangular heat radiation block, which is formed of reinforced concrete. On the surface of the heat radiation block 6, a heat radiation pipe 7 made of a resin or a metal having excellent heat radiation properties is installed in a meandering groove 8. .
[0014]
8a is a side opening portion of the groove 8 provided on the side surface of the heat dissipation block 6 and is formed on the front, rear, left and right side surfaces, and enables the end portion of the heat dissipation pipe 7 to be connected by the laying mode of the heat dissipation block 6. Yes. Reference numeral 9 denotes a height adjusting mechanism having a structure in which a bolt B is rotatably screwed to a nut portion N formed at the bottom of the recess 6a of the heat dissipation block 6, as shown in FIG. Sometimes the laying height is adjusted by the tip of the bolt B protruding from the bottom surface of the block 6.
[0015]
Therefore, in order to construct the snow melting device, first, a predetermined range of ground is excavated, and the heat exchange pile A is buried in the ground outside the snow melting range. On the other hand, a crushed stone layer is first laid in the snow melting area of the excavated ground, and sand or the like is placed on the ground, and then the plurality of heat dissipating blocks 6 are laid adjacent to each other by a predetermined area. Thereafter, the heat radiating pipe 7 is installed in alignment with the meandering grooves 8 of the heat radiating blocks 6, and the opening end portions 7 a corresponding to the discharge ports and the suction ports are projected from the side surface opening portions 8 a of the heat radiating blocks 6. After that, when the groove 8 is filled with a binder 10 such as mortar and the heat radiating pipe 7 is fixed, the surface of the heat radiating block 6 is made uniform.
[0016]
And as shown in FIG. 7, the heat exchange pipe 2 of the heat exchanging pile A buried in the ground, the heat dissipating pipe 7 of the heat dissipating block 6 laid on the ground surface, the circulation pump 11, the heat exchanging pile A side A thermometer T1 provided on the heat radiation block 6 and thermometers T2, T3, T4, a flow meter 12, a flow rate adjusting valve 13 and the like installed on the upper surface of the heat dissipating block 6 are connected by a connecting pipe 14 along the way, and the circulation path is Piping to form. Here, the connecting pipe 14 is covered with a heat insulating material such as expanded polystyrene to prevent wasteful heat dissipation. After the circulation path is formed, when the heat exchange pile A and the connection pipe 14 are backfilled, a chestnut layer and a soil layer are formed on the upper surface of the heat dissipation block 6 to form a uniform ground. Next, after thinly laying sand on the surface of the uniform ground, a decorative surface or the like is laid to form a road surface.
[0017]
Therefore, by passing a heat medium such as antifreeze liquid from one of the water flow parts 4 into the heat exchange pipe 2 of the heat exchange pile A buried in the ground, while passing through the forward pipe 5b and the backward pipe 5c. The heat medium absorbs geothermal heat and is heated, and the heated heat medium circulates in the meandering heat radiation pipe 7 of the heat radiation block 6 through the flow rate adjusting valve 13 and the flow meter 12 by the circulation pump 11. . Then, after heating the heat dissipating block 6, circulation such as returning to the circulation pump 11 through the flow rate adjusting valves 13 and the flow meter 12 is repeated.
[0018]
As described above, an experimental result as shown in FIG. 8 was obtained by circulating the heat medium heated by the geothermal heat through the heat dissipation block 6 of the snow melting device. Here, the circulation of the heat medium starts when the snow on the road surface is 13 cm, the underground temperature with respect to the underground depth, and the temperature condition in the heat exchange pipe 2 of the heat exchange pile A under the state shown in FIG. The snow melting state of the snow when the circulation continued for about 24 hours was observed. Of the total capacity of the heat medium, about 2.0 liters are secured in the heat exchange pipe 2 and 1.3 liters in the heat radiating pipe 7, and the circulation speed is 2 m / sec.
[0019]
Therefore, the experimental results in FIG. 8 will be explained. After 3 hours from the circulation start time, the thermometers T1, T2, T3, and T4 exceed the outside air temperature, and the amount of heat sufficient for the layer of the snow melting surface of the heat dissipating block 6 is sufficient. Is transmitted, indicating that snow melting is gradually starting. After about 10 hours and 30 minutes, although the temperature difference between the thermometers T3 and T4 was reversed, it became higher than the outside air temperature, and at this time, it was observed that the snow on the road surface was almost completely melted. Thereafter, although the outside air temperature is below freezing, the snow melting surface can maintain a temperature of 0 ° C. or more, and it is possible to prevent snow melting or snow accumulation only by geothermal heat without using an artificial heating device. It became possible and proved to be economically effective.
[0020]
FIG. 10 shows another embodiment of the heat exchange pile A, and the hollow pile 1 is the same as that of the above embodiment, but the coil shape of the heat exchange pipe 2 embedded in the main body of the hollow pile 1. The configuration of the part of the spiral portion 3 wound around is different from that of the above embodiment. That is, the spiral portion 3 in this embodiment is formed in a spiral shape so that the return pipe 5c through which the heat medium flows is constituted by a straight pipe, and the other forward pass pipe 5b surrounds the return pipe 5c constituted by a straight pipe. It consists of a spiral pipe.
[0021]
Further, as shown in FIG. 11, the relationship between the heat exchange pipe 2 and the rebar cage 15 is that the pitch between the spiral outward pipe 5b and the pitch between the helix bars 16 of the rebar cage 15 They are assembled so as to be alternately arranged in the longitudinal direction. However, in the present invention, contrary to this configuration, the object of the present invention can be achieved even when the return pipe 5c is formed of a spiral pipe and the forward pipe 5b is formed of a straight pipe. Further, when a steel pipe is used for the heat exchange pipe 2, for example, an RC pile or a house pile, the helical return path pipe 5c or the forward path pipe can be used as an alternative to the spiral bar 16 of the reinforcing bar 15. It is also possible to weld 5b to the shaft rod 17 for use.
[0022]
【The invention's effect】
Since the heat exchanging pile according to the present invention is configured as described above, the heat exchanging pipe includes a heat exchanging pipe that is much longer than the length of the pile, and the heat exchanging pipe has a full-thickness portion of the hollow pile. Therefore, it is possible to increase the endothermic area and improve the endothermic efficiency of geothermal heat. Therefore, it is possible to ensure a wide heat radiation range in the surface portion per hollow pile. Further, by forming the heat exchange pipe with a bellows pipe, there are various effects that a wider endothermic area can be obtained and a higher endothermic rate can be secured.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a heat exchange pile according to the present invention.
FIG. 2 is a front view showing a state before molding of a heat exchange pipe embedded in a heat exchange pile.
FIG. 3 is an exploded perspective view of a heat exchange pipe embedded in a heat exchange pile.
FIG. 4 is a partial cross-sectional perspective view of a heat exchange pipe.
FIG. 5 is a perspective view of a heat dissipation block.
FIG. 6 is a partially enlarged perspective view of a heat dissipation block.
FIG. 7 is a piping diagram of a heating device according to the present invention.
FIG. 8 is a diagram showing a relationship between time and temperature of a heating device.
FIG. 9 is a temperature distribution diagram of the heat exchange pile.
FIG. 10 is a longitudinal sectional view of a heat exchange pile according to another embodiment.
FIG. 11 is a partial perspective view of a heat exchange pile.
[Explanation of symbols]
A Heat exchange pile 1 Concrete hollow pile 2 Heat exchange pipe 3 Spiral part 4 Water flow part 5b Outward pipe 5c Return pipe 6 Heat radiation block 7 Heat radiation pipe 8 Groove 14 Connection pipe

Claims (2)

A spiral part in which a forward pipe and a return pipe in which a heat medium flows are alternately wound around a thick part of a concrete hollow pile, and an upper part of the hollow pile passes through the upper end surface of the hollow pile. A heat exchange pipe composed of a water part is embedded, wherein both or one of the forward pipe and the return pipe of the spiral part through which the heat medium flows is formed of a bellows-like pipe. Heat exchange pile.   The heat exchanging pile according to claim 1 embedded in the ground, a concrete heat dissipating block having a meandering heat dissipating pipe laid on the ground surface, a heat exchanging pipe of the heat exchanging pile, and the heat dissipating block A heating apparatus comprising a heat radiation pipe and a circulation path connected so that a heat medium flowing inside circulates therein.

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