JP2010276329A - Building using geothermal heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building using geothermal heat efficiently collecting geothermal heat without impairing safety of the building. <P>SOLUTION: Air circulating steel pipes 30 forming a U-shaped air passage are buried in soil cement columns 62 buried in the ground, and the plurality of air circulating steel pipes 30 are connected by connection pipes 80 on a mat foundation 70 to form a serial air passage. The temperature of air that enters from an air introducing end 81 of the serial air passage becomes substantially the same as that in the ground while flowing through the U-shaped air passage of the air circulating steel pipes 30, and the air is blown out into the building from an air discharge end 82. By using the soil cement columns 62 reinforcing the support ground of the building, the building using the geothermal heat can be built safely. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a building such as a house capable of adjusting the room temperature using geothermal heat.

When the temperature in the ground is below a certain depth, it is almost constant throughout the year, regardless of the outside air temperature. Therefore, the well water feels cold in summer and warm in winter. This system that realizes air conditioning (cooling and heating) of houses using geothermal heat is effective for energy saving of houses and mitigation of urban heat island phenomenon, and is expected to spread.
In the currently developed system, a resin heat exchange pipe is used to circulate the heat exchange medium between the heat pump and the ground, and this heat exchange pipe is inserted into a steel pipe and buried in the ground. is doing. The heat exchange medium circulating in the heat exchange pipe takes ground heat to the ground, and the heat pump exchanges heat between the heat exchange medium and, for example, the air conditioner refrigerant.

In many conventional geothermal heat utilization systems, heat exchange pipes are buried at a position different from the building (house), but the following Patent Documents 1 and 2 use building foundation piles. A method of arranging a heat exchange pipe in the ground has been proposed.
FIG. 13 is a diagram described in Patent Document 1. In this construction method, as shown in FIG. 13A, a part of the heat exchange pipe 13 extending from the heat pump 20 is inserted into a hollow steel pipe pile 10 embedded as a foundation of a building. The upper end of the steel pipe pile 10 protrudes from the concrete slab 12a, avoiding the position of the rising portion 12b of the “solid foundation” 12, as shown in FIG. 13 (b). However, if the steel pipe pile 10 remains protruding from the concrete slab 12a, the supporting force of the steel pipe pile 10 to the solid foundation 12 is weak. Therefore, the hook-like plate 11 is welded to the steel pipe pile 10 and the foundation 12 solid with the plate 11 is attached. Support from below.

FIG. 14 is a diagram described in Patent Document 2. In this construction method, when building the building 2, as shown in FIG. 14 (a), the surface layer portion of the site is removed up to the excavation line 24, and the steel pipe pile 6 is driven according to the arrangement pattern of the solid foundation 4. Next, after the heat exchange pipe 10 is accommodated in the steel pipe pile 6, the pile head cap 8 is welded to the upper opening (FIG. 14 (b)). Further, the heat exchange pipes 10 accommodated in the plurality of steel pipe piles 6 are connected to each other by a horizontal draw pipe 12. Thereafter, the excavation site is backfilled with soil, and the solid foundation 4 is formed so that the lower surface thereof is in contact with the upper surface of the pile head cap 8. After the solid foundation 4 is completed, the building 2 is constructed thereon. Further, the end of the horizontal pipe 12 embedded in the ground is taken out to the ground and connected to the heat pump 14.
Thus, when the underground heat is collected using the foundation pile of the building, it is not necessary to prepare a site for burying heat exchange pipes in a place different from the building. Therefore, even when a house or the like is built on a site where there is no room around the building, geothermal heat can be used.

JP 2005-273235 A JP 2009-8320 A

However, the original function of the foundation pile is to stably support the foundation of the building, but the conventional method of using the foundation pile of the building for heat collection of the geothermal heat can sufficiently perform this original function. There is no fear.
For example, in the construction method of Patent Document 1, the position of the rising portion of the solid foundation on which the load of the building is applied and the position of the foundation pile supporting the solid foundation do not match, so the force applied to the solid foundation does not balance, There is a risk of cracks in the foundation.
Moreover, in the construction method of patent document 2, although the foundation pile can be driven into the position of the rising part of the solid foundation, it is the pile head cap welded to the foundation pile which is driven directly that supports the solid foundation. For this reason, the ability to weld or not perform on-site greatly affects the bearing capacity of the solid foundation.

  In addition, in the system that uses the underground heat guided to the ground via a heat pump, a pump that circulates the heat exchange medium in the heat exchange pipe and a compressor that compresses the refrigerant in the heat pump are necessary. Since energy (electric power) is consumed for driving, a large energy saving effect cannot be expected.

  The present invention was devised in consideration of such circumstances, and it is possible to collect geothermal heat within a building site without impairing the safety of the building, and it has a high energy saving effect. The purpose is to provide buildings that use medium heat.

  A building using geothermal heat according to the present invention includes a plurality of soil cement columns embedded in the ground, and a body portion forming a U-shaped air passage embedded in the soil cement column, and an inlet for the air passage. And an air circulation metal pipe projecting from the soil cement column, and a solid foundation supported by the soil cement column in a state penetrating the short pipe part of the air circulation metal pipe. A connecting pipe that connects the short pipe portions in a space on the solid slab so as to connect the inlets and outlets of the plurality of air circulation metal pipes, and an air passage of the plurality of air circulation metal pipes An air introduction end for introducing air into a series air passage connected in series by the connecting pipe, an air discharge end for discharging air flowing through the series air passage, and air in the series air passage. Supporting the flow Air that flows through the series air passage is discharged from the air discharge end into the interior of the building constructed on the solid foundation or in the space below the building. It is characterized by that.

  In this building, an air circulation metal pipe is embedded in the soil cement column that supports the solid foundation, and a part of this air circulation metal pipe (short pipe part) protrudes into the space above the solid foundation, and multiple air circulation metal pipes Are connected by a connecting pipe. With such a configuration, after the air introduced from the air introduction end passes through the air circulation metal pipe embedded in each soil cement column, a “series air passage” that is discharged from the air discharge end is formed. In the process of passing through the air circulation metal pipe, the air flowing into this series air passage is warmed by underground heat in the winter when the temperature is lower than the underground temperature, and is cooled in the summer when the temperature is higher than the underground temperature. It is. By guiding the air exhausted from the serial air passage to a room or an under-floor space in the building, the room temperature in the building can be raised in winter and lowered in summer.

Moreover, in the building using geothermal heat of the present invention, the air flowing through the series air passage may be introduced from the air introduction end arranged outside the building.
In particular, in summer, the room temperature can be effectively lowered by introducing the outside air at a temperature as low as possible away from the ground surface into the series air passage.

In the geothermal building of the present invention, the soil cement column is embedded under the rising portion of the solid foundation, and the short pipe portion of the air circulation metal tube protruding from the soil cement column is connected to the rising portion. Project to a position that does not overlap.
In this way, the soil cement column supports the position of the rising portion of the solid foundation where the building load is applied, so that the solid foundation can be supported stably, and multiple air-circulating metal tubes protruding from the solid foundation can be used. By connecting the short pipe portions with the connecting pipe, the series air passage can be easily formed.

Further, in the geothermal building of the present invention, the main body portion of the air circulation metal tube is configured by joining the contact surfaces of two parallel square metal tubes, and each of the square metal tubes The short tube portion is connected to the upper end, the lower ends of the rectangular metal tubes are sealed, and vent holes for communicating the two rectangular metal tubes are formed in the contact surface in the vicinity of the lower ends.
With such a configuration, an air circulation metal tube having a U-shaped air passage can be formed.

Further, in the geothermal building of the present invention, the main body portion of the air circulation metal tube is composed of two composite metal tubes in which a short square metal tube is coupled to both ends of the round metal tube, and the square metal tube. And connecting the short pipe portion to each of the square metal tubes at the upper end of the composite metal tube, sealing each of the square metal tubes at the lower end of the composite metal tube, You may make it form the vent hole which connects the said 2 composite metal pipes to the joint surface which joined the square metal pipe.
With such a configuration, an air circulation metal tube having a U-shaped air passage can be formed using a round metal tube.

Moreover, in the geothermal building of the present invention, a header with a sharp tip is added to the lower end of the air circulation metal pipe.
The header added to the tip facilitates the insertion of the air circulation metal tube when the air circulation metal tube is embedded in the liquid soil cement.

Moreover, in the geothermal building of this invention, you may add a rotary blade to the outer periphery near the lower end of the said air circulation metal pipe.
The rotors facilitate the insertion of the air circulating metal tube into the liquid soil cement.

Further, in the building using geothermal heat of the present invention, a solar heat collecting panel for heating the air in the pipe with solar heat is further provided, and the heated air in the pipe is inside the building constructed on the solid foundation or You may make it discharge | emit to the space of the lower part of the said building.
By using solar energy of natural energy together with underground heat, the energy saving effect is further improved.

According to the present invention, a building using geothermal heat can be safely built using a reinforcing body that reinforces a supporting ground of the building. In this building, a ground heat collection mechanism is provided in the ground below the building, so that it can be constructed even on a site where there is no room around.
Further, in the present invention, air that has been warmed or cooled in the ground is directly blown into the building, so that the equipment required for using the underground heat is simple and has a high energy saving effect. .

The figure which shows the structure of the air circulation steel pipe which concerns on embodiment of this invention. Figure showing a soil cement column in which the air circulation steel pipe of Fig. 1 is embedded. The figure which shows arrangement | positioning of the soil cement column of FIG. The figure which shows the state which formed the solid foundation on the soil cement column of FIG. The figure which shows a mode that the air circulation steel pipe embedded in the soil cement column is connected with a connection pipe The figure which shows the state which connected the air circulation steel pipe embedded in the soil cement column of FIG. 4 with the connection pipe The figure which shows the state which connected the air circulation steel pipe embedded in all the soil cement columns and formed one serial air passage. The figure which shows the building which concerns on embodiment of this invention The figure which shows the other example of the air circulation steel pipe Diagram showing air circulating steel pipe with rotor blades A diagram showing a building that uses geothermal and solar heat Diagram explaining how to form a soil cement column Diagram showing conventional technology for collecting underground heat using steel pipe piles The figure which shows other conventional technology which collects underground heat using a steel pipe pile

In order to build a building using geothermal heat according to the present invention, first, a plurality of soil cement columns in which air circulating steel pipes are embedded in the site of the building are formed in order to reinforce the supporting ground of the building. The air circulation steel pipe has a U-shaped air passage.
Next, a solid foundation is formed on a supporting ground reinforced with a soil cement column. At this time, the tip of the air circulation steel pipe is protruded from the solid foundation.
Next, the air circulation steel pipe which protruded from the solid foundation is connected with a connection pipe, and the serial air path which connected the air passage of a plurality of air circulation steel pipes in series is formed.
After these preparations, the building will be built on a solid foundation.

A method for forming a soil cement column is widely known. For example, the soil cement column is formed by an apparatus shown in FIG.
This apparatus includes an excavation shaft 53 provided with an excavation head 54, suspension means 58 that suspends and lowers the excavation shaft 53, rotation means 59 that rotates the excavation shaft 53, and a cement-based solidified material mixed with water. A plant mixer 51 that generates a slurry in the form of a slurry, and a management device 52 that manages the amount of slurry supplied to the inside of the excavation shaft 53.
The excavation head 54 has an excavation blade 56 and a stirring blade 55 that rotate together with the excavation shaft 53, and an excavation hole 61 is formed in the ground 60 by the rotation of the excavation blade 56. A slurry discharge port is formed near the tip of the excavation shaft 53, and the slurry 57 discharged from the discharge port and the earth cut by the excavation blade 56 are agitated and mixed by the stirring blade 55. Soil cement (a fluid mixture of local soil and cement) is produced.
If the excavation head 54 is pulled up from the excavation hole 61 and left until the soil cement filling the excavation hole 61 is solidified, a cylindrical soil cement column is formed in the ground. The solidification of the soil cement requires several hours to two days, although it depends on the size of the excavation hole 61 and the type of cementitious solidification material.

In the present invention, when the soil cement in the excavation hole 61 is in a fluid state, an air circulating steel pipe is inserted into the excavation hole 61 and the soil cement is solidified in that state.
FIG. 1 shows an embodiment of an air circulation steel pipe. 1A is a top view, FIG. 1B is a front sectional view, and FIG. 1C is a bottom view.
The air circulation steel pipe 30 has a main body portion formed by welding the contact surfaces of two parallel square steel pipes 31, 31. A short pipe portion is formed at the upper ends of the square steel pipes 31, 31. Short round steel pipes 32, 32 are welded. The lower ends of the square steel pipes 31 and 31 are sealed with a plate 34, and a vent hole 33 for communicating the two square steel pipes 31 and 31 is formed on the contact surface in the vicinity of the lower ends. Therefore, the air circulation steel pipe 30 has a U-shaped air passage composed of the short pipe portion 32 → the square steel pipe 31 → the vent hole 33 → the square steel pipe 31 → the short pipe portion 32.
A header 35 with a sharp tip is welded to the lower ends of the square steel pipes 31 and 31 closed by the plate 34. The header 35 is provided to facilitate the insertion of the air circulating steel pipe 30 into the soil cement of the excavation hole 61.

The air circulating steel pipe 30 is suspended by the suspension means 58, and as shown in FIG. 2 (a), only the short pipe portion 32 is formed from the soil cement at a predetermined position of the excavation hole 61 occupied by the fluid state soil cement. Insert so that it protrudes. At this time, the water content of the slurry 57 mixed with the soil cement is adjusted in advance so that the air circulating steel pipe 30 descending by the suspension means 58 easily enters the soil cement.
The soil cement is solidified while keeping the air circulation steel pipe 30 in the state of FIG. 2A, and the soil cement column 62 in which the air circulation steel pipe 30 is embedded is formed. FIG. 2B shows a top view thereof.

  As shown in FIG. 3, a plurality of the soil cement columns 62 are formed according to a solid foundation arrangement pattern. In FIG. 3, the rising part of the solid foundation is indicated by a dotted line. The soil cement column 62 is formed in a well-balanced position where the rising portion is planned, and is formed in a place where the rising portion is not provided if further reinforcement of the supporting ground of the building is necessary. The air circulation steel pipe 30 is embedded in the soil cement column 62 so that the short pipe portion 32 protruding from the soil cement column 62 does not overlap the position of the rising portion.

When the formation of the soil cement column 62 on the supporting ground is completed, a solid foundation 70 is then formed on the supporting ground reinforced with the soil cement column 62 as shown in FIG. At this time, the tip of the short pipe portion 32 of the air circulation steel pipe 30 is projected onto the slab 72 of the solid foundation 70. The protruding height of the short pipe portion 32 is set to be lower than the height of the rising portion 71.
When the solid foundation 70 is completed, as shown in FIGS. 5 and 6, the short pipe portion 32 of the air circulation steel pipe 30 protruding from the solid foundation 70 and the short pipe portion 32 of the adjacent air circulation steel pipe 30 can be expanded and contracted. Connect with connecting pipe 80. By doing so, as shown in FIG. 5, a series air passage is formed in which the U-shaped air passages of the plurality of air circulation steel pipes 30 are connected in series.
FIG. 7 shows an example in which all the air passages of the air circulation steel pipe 30 embedded in the soil cement column 62 are connected by a connecting pipe 80 to form one serial air passage. In FIG. 7, 81 and 82 have shown the air introduction | transduction edge part and air discharge edge part which are mentioned later.

A building is built on the completed solid foundation 70.
As shown in FIG. 8, the air introduction end portion 81 that sucks air into the series air passage is installed outside a building, for example. The air discharge end portion 82 for discharging air from the serial air passage is installed in a space under the floor or in a room. Further, both the suction fan 83 and the blower fan 84 are sucked into the air passage so that the outside air sucked from the air introduction end portion 81 is blown out from the air discharge end portion 82 through the series air passage, or Install only one of them.
The outside air sucked from the air introduction end 81 is warmed in the process of passing through the air circulation steel pipe 30 in the winter when the underground temperature is higher than the outside air temperature, while the underground temperature is compared with the outside temperature. In the summer, when it is lower, it is cooled in the process of passing through the air circulating steel pipe 30 and blows out from the air discharge end portion 82 into the building.

The length (depth) of the soil cement column 62 is often set to about 3 m to 15 m. Assuming that the length of the main body portion of the air circulating steel pipe 30 embedded in the soil cement column 62 is 10 m, the U-shaped air passage is 20 m, so that 20 soil cement columns 62 are provided as shown in FIG. When the air circulation steel pipe 30 buried in them is connected to form one serial air passage, the length of the serial air passage existing in the ground is about 400 m.
This length is long enough to exchange heat between the air flowing through the series air passage and the ground, and the air sucked from the air introduction end 81 has a temperature substantially equal to the underground temperature. Then, the air is discharged from the air discharge end portion 82.
Therefore, the room temperature of the building rises in winter and falls in summer due to the air blown from the air discharge end portion 82.

Thus, in this geothermal building, the air circulation steel pipe 30 is embedded in the soil cement column that reinforces the supporting ground, and the ground heat is collected, so that the heat exchange with the ground is sufficiently possible. A series air passage can be secured, and air having substantially the same temperature as the underground temperature can be obtained by this series air passage. The air assimilated to the underground temperature can be directly blown into the building and used for an air conditioning system that adjusts the room temperature.
Since this air conditioning system does not require a device such as a heat pump, the cost of the equipment and the energy required to operate the equipment can be reduced.

  In addition, in an air conditioning system using an air conditioner, the energy efficiency is remarkably reduced unless the room is airtight. However, in the air conditioning system of the present invention in which air exchanged in the ground is directly blown into the building, the room is particularly airtight. There is no need to keep. In the case of buildings with high airtightness, harmful substances volatilized from building materials and wallpaper paints may impair health. However, in the building of the present invention, since airtightness is not required, it is freed from such anxiety.

In addition, since the diameter of the soil cement column is usually about 50 cm to 60 cm, if the cross-sectional area of the air circulation steel pipe 30 is set to about 10 cm × 20 cm, the soil cement column formed at the position of the rising portion of the solid foundation, The air circulation steel pipe 30 can be embedded so as not to overlap the position of the rising portion. Therefore, the foundation rises where the building load is applied are supported by a soil cement column to ensure the safety of the building, and an air circulation steel pipe is embedded in the soil cement column for use in collecting ground heat. be able to.
Moreover, the air circulation steel pipe embedded in the soil cement column has the effect of reinforcing the soil cement column.

  In addition, although the example which has arrange | positioned the air introduction | transduction edge part 81 of a serial air passage outside the building is shown here, you may provide inside a building. However, it is preferable to place it outside the building because fresh outside air can be taken in. In particular, in summer, it is advantageous to take in the outside air at a temperature as low as possible and away from the ground surface because it is easy to assimilate to the ground temperature during passage through the series air passage.

Moreover, you may comprise an air circulation steel pipe as shown in FIG. 9A is a front view, FIG. 9B is a cross-sectional view taken along the line AA in FIG. 9A, FIG. 9C is a top view, and FIG. 9D is a bottom surface. FIG. The air circulation steel pipe is composed of two composite steel pipes having a main body portion in which short square steel pipes 37 and 38 are coupled to both ends of a round steel pipe 36, and the two composite steel pipes are square steel pipe 37 and square steel pipe. Joined at the position of the steel pipe 38. The joint surface of the square steel pipe 38 is provided with a vent hole 33 for communicating the two composite steel pipes. A short round steel pipe 32 constituting a short pipe portion is coupled to an upper end of the square steel pipe 37, a lower end of the square steel pipe 38 is sealed with a plate 34, and a header 35 having a sharp tip is provided on the outer surface of the plate 34. Welded. This air circulation steel pipe is composed of a short pipe portion 32 → a square steel pipe 37 → a round steel pipe 36 → a square steel pipe 38 → a vent hole 33 → a square steel pipe 38 → a round steel pipe 36 → a square steel pipe 37 → a short pipe portion 32. And a U-shaped air passage.
In this air circulation steel pipe, a round steel pipe can be used for the main body portion.

  In order to facilitate the insertion of the air circulating steel pipe into the soil cement, as shown in FIG. 10A, a header 35 having a sharp tip is provided at the lower end of the air circulating steel pipe, and the rotor blade 39 is provided on the outer periphery near the lower end. May be added. FIG. 10B is a top view, and FIG. 10C is a bottom view. When this air circulating steel pipe is suspended by the suspension means and lowered into the fluidized soil cement, it moves straight into the soil cement while rotating without deviating from the lowered position.

  In the geothermal building of the present invention, in order to further use natural energy, as shown in FIG. 11, a solar heat collecting panel 90 that warms the air in the tube with solar heat is installed on the roof or the like. The warmed air may be guided to the interior of the building or the space below the building, and the energy saving effect may be enhanced using solar heat and underground heat.

The forms and numerical values shown here are merely examples, and the present invention is not limited thereto.
The air circulating steel pipes embedded in a plurality of soil cement columns embedded in the site do not necessarily have to be connected so as to form one serial air passage. A plurality of soil cement columns may be divided into a plurality of groups, and a plurality of series air passages may be formed by connecting air circulation steel pipes embedded in the soil cement columns for each group.
The air circulation steel pipe may be formed of a metal material such as an iron alloy or an aluminum alloy.
In addition, the air conditioning system of the present invention that blows air assimilated to the underground temperature directly into the building may be used in combination with another air conditioning system as an auxiliary system that complements the other system.

  The present invention uses geothermal heat to save energy in buildings and mitigate urban heat island phenomenon, regardless of the type of building, such as personal housing, apartment buildings, factories, commercial facilities, and public buildings. In addition, it can be widely used regardless of the structure of the building such as wooden, steel, reinforced concrete.

DESCRIPTION OF SYMBOLS 30 Air circulation steel pipe 31 Square steel pipe 32 Short pipe part 33 Vent hole 34 Plate 35 Header 36 Round steel pipe 37 Square steel pipe 38 Square steel pipe 39 Rotary blade 51 Plant mixer 52 Management apparatus 53 Drilling shaft 54 Drilling head 55 Stirring blade 56 Excavation blade 57 Slurry 58 Suspension means 59 Rotation means 60 Ground 61 Excavation hole 70 Solid foundation 71 Rising portion 72 Slab 80 Connecting pipe 81 Air introduction end portion 82 Air discharge end portion 83 Blower for suction 84 Blower for blowout 90 Solar heat collecting panel

Claims (8)

A geothermal building that uses geothermal heat,
Multiple soil cement columns embedded in the ground,
An air circulation metal pipe in which a main body part forming a U-shaped air passage is embedded in the soil cement column, and a short pipe part following the introduction port and the discharge port of the air passage projects from the soil cement column;
A solid foundation supported by the soil cement column in a state penetrating the short pipe portion of the air circulation metal pipe;
A connecting pipe for connecting the short pipe portions in the space on the slab of the solid foundation so as to connect the inlets and outlets of the plurality of air circulation metal pipes;
An air introduction end portion through which air is introduced into a series air passage in which air passages of a plurality of the air circulation metal tubes are connected in series by the connection pipe;
An air discharge end from which air flowing through the series air passage is discharged;
Air blowing means or suction means for supporting air flow in the serial air passage;
The air flowing through the series air passage is discharged from the air discharge end into the interior of the building constructed on the solid foundation or in the space below the building. Thermal building.   It is a geothermal use building of Claim 1, Comprising: The air which flows through the said serial air path is introduce | transduced from the said air introduction | transduction edge part arrange | positioned outside the said building, The geothermal heat utilization characterized by the above-mentioned. building.   It is a geothermal use building of Claim 1 or 2, Comprising: It has the said soil cement column embed | buried under the standing part of the said solid foundation, The said air circulation metal pipe which protrudes from the said soil cement column A building using geothermal heat, characterized in that a short pipe portion protrudes at a position not overlapping with the rising portion.   It is a building using geothermal heat according to any one of claims 1 to 3, wherein the main body portion of the air circulation metal tube is configured by joining contact surfaces of two parallel rectangular metal tubes, The short tube portion is connected to the respective upper ends of the rectangular metal tubes, the lower ends of the rectangular metal tubes are sealed, and the two rectangular metal tubes communicate with the contact surface in the vicinity of the lower ends. A building using geothermal heat, characterized by a vent hole to be formed.   The building using geothermal heat according to any one of claims 1 to 3, wherein the main body portion of the air circulation metal tube is a composite metal tube in which a short square metal tube is coupled to both ends of a round metal tube. A book is formed by joining the square metal pipes, the short pipe portion is connected to each of the square metal pipes at the upper end of the composite metal pipe, and the square metal pipe at the lower end of the composite metal pipe. Each of the above is sealed, and a ventilation hole for communicating the two composite metal tubes is formed in a joint surface where the square metal tubes are joined.   6. The geothermal building according to claim 4, wherein a header with a sharp tip is added to a lower end of the air circulation metal pipe.   It is a geothermal use building in any one of Claim 4 to 6, Comprising: A rotary blade is added to the outer periphery near the lower end of the said air circulation metal pipe, The geothermal use building characterized by the above-mentioned.   The building using geothermal heat according to claim 1, further comprising a solar heat collecting panel that heats the air in the pipe with solar heat, wherein the warmed air in the pipe is constructed on the solid foundation. A geothermal building characterized by being discharged into the space inside the building or in the lower part of the building.