JP4136847B2 - Buried pipe for heat exchange - Google Patents

Description

  The present invention relates to a buried pipe for heat exchange that is buried in the ground and used in order to use underground heat for air conditioning, radiant cooling and heating, hot water supply, and the like.

  The underground temperature is relatively stable with little temperature change throughout the year. Therefore, for example, in the Japanese climate, the underground temperature is low with respect to the outside temperature in the summer and is high with respect to the outside temperature in the winter. Then, the apparatus utilized as heat sources, such as an air conditioning, is proposed by exchanging heat between the underground and the ground using the foundation pile buried under the foundation of the building.

  For example, Patent Document 1 discloses a technique in which piping is provided inside a foundation pile buried under the foundation and heat exchange is performed through water or the like in the pipe. In Patent Document 1, a heat exchange pipe piped inside a pile is drawn out as it is from the pile head and is integrally provided on the foundation of the building on the pile head.

  Patent Document 2 discloses a hollow foundation pile driven into the ground during construction of a building and a heat medium injected into the hollow of the foundation pile or a heat medium extracted from the hollow of the foundation pile. An underground heat storage device including an air conditioning device is disclosed. Also in this patent document 2, the heat-medium heat exchanger tube extended from the hollow inside of a foundation pile is withdraw | derived to the upper part as it is from the pile head, and is integrally provided in the foundation mat of the building on a pile head.

JP-A-1-123951 JP-A-8-184063

  However, in the technique disclosed in Patent Document 1 above, a foundation pile buried under the foundation of the building is used, and further, the pipe drawn out from the pile head as it is to the upper part is provided integrally with the foundation. For example, it has not been possible to cope with deterioration or clogging of piping arranged inside the pile, and maintenance has not been considered.

  Moreover, in the said patent document 2, although there exists opening in the building foundation part which hits on the opening of a pile head, and piping is drawn out from this opening, the foundation forms (for example, cloth foundation other than a solid foundation) are shown. For foundations and independent foundations, it is often difficult to provide an opening in the foundation at the top of the pile head due to the strength of the foundation, and even if it is possible to provide an opening, the pipe is drawn to the upper part of the foundation. There is a problem that it becomes necessary to provide a space for maintenance, and there is a restriction on the use of the upper space of the foundation.

  Therefore, the present invention has been made in view of the above-mentioned problems, and the object of the present invention is that maintenance is possible and maintenance work can be easily performed, and further, for use in the space above the buried pipe. The present invention provides a buried tube for heat exchange that has few restrictions and is easy to use effectively.

In order to achieve the above object, a first configuration of the present invention is a buried pipe for heat exchange that is used by burying at least a part of the ground in order to use underground heat, An opening on the side embedded in the ground is closed, and has a detachable closing member that closes an upper opening opposite to the embedded side, and is embedded on the side opposite to the embedded side on the upper side surface of the pipe, the guide portion of the heat medium to protect and guide the pipe to flow into the embedded tube outer provided, wherein the guide portion is a notch portion provided by cutting an upper end of the buried pipe It is characterized by being.

The second configuration of the present invention is a heat exchanging pipe that is used by burying at least a part of the ground in order to use underground heat, and the buried pipe is buried in the ground. An opening on the closed side is closed, and has a detachable closing member that closes the upper opening opposite to the embedded side, and a pipe through which a heat medium flows is embedded in a side surface of the closing member A guide portion for guiding and protecting the inside and outside of the tube is provided, and the guide portion is a notch portion provided by notching a side surface of the closing member .

  According to the above configuration, the pipe can be taken in and out of the buried pipe from the upper opening of the buried pipe or the guide portion, and the filling material inside the buried pipe can be replenished / replaced. Maintenance can be performed when a problem occurs, and the maintenance work can be easily performed. In addition, when piping to the buried pipe, the pipe is guided to the guide part, and the pipe can be temporarily held by the guide part, so that the piping work becomes easy and required for the piping work. Time can be shortened. Further, even when a load is applied to the upper part of the buried pipe, the pipe is protected by the guide portion, so that the pipe can be prevented from being crushed by the load applied to the upper part of the buried pipe. Further, since the upper opening of the buried pipe is closed by the closing member, it is possible to prevent soil and the like from entering the buried pipe from the upper opening of the buried pipe. In addition, since the pipe is drawn out from the side surface of the buried pipe or the side surface of the closing member by the guide part and does not protrude from the upper part of the buried pipe, the buried pipe should be placed in a place other than the bottom of the foundation. The upper space can be used effectively.

  As described above, according to the present invention, the upper opening of the buried pipe or the guide portion for guiding and protecting the pipe into and out of the buried pipe is used to put the pipe in and out of the buried pipe and the filler inside the buried pipe. Since replenishment and replacement are possible, maintenance can be performed when a problem occurs in the piping arranged inside the pipe, and the maintenance work can be easily performed. In addition, when piping to the buried pipe, the pipe is guided to the guide part, and the pipe can be temporarily held by the guide part, so that the piping work becomes easy and required for the piping work. Time can be shortened. Further, even when a load is applied to the upper part of the buried pipe, the pipe is protected by the guide portion, so that the pipe can be prevented from being crushed by the load applied to the upper part of the buried pipe. Further, since the upper opening of the buried pipe is closed by the closing member, it is possible to prevent soil and the like from entering the buried pipe from the upper opening of the buried pipe. In addition, since the pipe is drawn out from the side surface of the buried pipe or the side surface of the closing member by the guide part and does not protrude from the upper part of the buried pipe, the buried pipe should be placed in a place other than the bottom of the foundation. The upper space can be used effectively.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of a buried pipe for heat exchange according to the invention will be described in detail with reference to the drawings.

  The buried pipe for heat exchange according to the present invention is a buried pipe for heat exchange that is used by burying at least a part thereof in the ground in order to use the underground heat. A heat exchanging pipe with at least a portion buried in the ground is a buried pipe in which the entire pipe is buried in the ground, or a buried pipe that is buried in the ground so that a portion is exposed to the outside. Etc.

  Moreover, as the buried pipe for heat exchange according to the present invention, for example, an existing pile such as a steel pipe pile, a concrete pile, a soil cement composite pile in which a soil cement pillar and a steel pipe pile are integrated is used for a building foundation. Can be mentioned. In addition, the buried pipe for heat exchange according to the present invention is not limited to the above-mentioned pre-built pile, and is any buried pipe that is used to bury at least a part in the ground and use the heat in the ground. Other buried pipes may be used.

  When using a heat exchanging buried pipe as described above in a geothermal heat utilization device, a heat exchanging pipe is arranged inside the hollow of the heat exchanging buried pipe, and the space between the pipe and the buried pipe main body is filled. A material is appropriately filled, and the heat in the ground is used by flowing a heat medium in the pipe.

  In addition, water, oil, antifreeze, air etc. are mentioned as a heat medium which lets the said piping for heat exchange pass. Examples of fillers that fill the space between the heat exchange pipe and the buried pipe body include water, oil, antifreeze, sand, gravel, lightweight aerated concrete, metal pieces, steel balls, and stainless steel spheres. Among them, water, oil, and antifreeze are particularly preferable.

  In the buried pipe for heat exchange according to the present invention, the opening on the side buried in the ground is closed. As a method of closing the buried pipe opening on the side buried in the ground, it is most preferable to block the tip or the middle of the buried pipe in advance with a closing member such as a lid or a barrier before the buried pipe is buried. It is also possible to close the buried pipe by dropping cement, adhesive or the like from the inside of the buried pipe to the tip.

  Furthermore, the buried pipe for heat exchange according to the present invention has a closing member that closes the upper opening on the side opposite to the buried side, on the upper side surface of the buried pipe on the side opposite to the buried side, It is the structure which provided the guide part for guiding and protecting the piping through which a heat medium flows into and out of the said buried pipe. The configuration of the buried pipe for heat exchange will be specifically described with reference to the drawings.

  For example, as shown in FIG. 1 (a), a heat exchanging buried pipe 1 according to the present invention has a detachable closing member 9 that closes an upper opening of the buried pipe after the pipe 2 is installed in the buried pipe 1. is doing. Further, on the upper side surface of the buried pipe 1, a notch 3 is formed by cutting out the upper end of the buried pipe 1 as a guide part for guiding and protecting the pipe 2 into and out of the buried pipe.

  Thus, by providing the notch 3 as a guide part on the upper side surface of the buried pipe 1, when replacing the pipe inside the pipe, the removable closure member 9 can be removed to remove the pipe 2 from the upper opening. Since it is possible to refill / replace the filler inside and out of the buried pipe, it is possible to perform maintenance such as dealing with deterioration and clogging of the pipe arranged inside the pipe, and easy maintenance work. Can do.

  In addition, the pipe 2 is guided to the notch 3 during the piping work to the buried pipe 1, and the pipe 2 can be temporarily held by the notch 3. Piping work such as connecting / disconnecting pipes and connecting work when the pipes are made of a plurality of members is facilitated, and the time required for the pipe work can be shortened.

  Further, even when a load is applied to the upper part of the buried pipe 1, the pipe 2 is protected by the notch 3, and therefore the pipe 2 is prevented from being crushed by the load applied to the upper part of the buried pipe 1. Can do.

  In addition, since the upper opening of the buried pipe 1 is closed by the closing member 9, it is possible to prevent soil and the like from entering the buried pipe 1 from the upper opening of the buried pipe 1. In addition, the pipe 2 is drawn out from the side surface of the buried pipe 1 by the notch part 3 as the guide part and does not protrude from the upper part of the buried pipe 1. Thus, the space above the buried pipe can be used effectively.

  The shape of the notch as the guide portion is not limited to the shape shown in FIG. 1 (a), but may be any shape and size that guides and protects the pipe 2 into and out of the buried pipe 1. It may be a good shape.

  In the embodiment described above, as the guide part included in the heat exchanging buried pipe according to the present invention, the notched part 3 provided on the upper side surface of the buried pipe by notching the upper end part of the buried pipe as illustrated in FIG. However, the present invention is not limited to this.

  For example, the guide part of the buried pipe 1 for heat exchange may be a hole 4 in which an upper side surface of the buried pipe 1 is drilled as shown in FIG. By configuring in this way, the same operation and effect as the above-described embodiment can be obtained.

  Further, as shown in FIG. 2 (b), a cylindrical guide member 12 may be provided in the hole 4 of the buried pipe 1. By comprising in this way, the space | gap between the piping 2 can be easily plugged up with an adhesive tape or the like.

  Further, the closing member 9 that closes the upper opening of the buried pipe 1 is not limited to the detachable closing member 9 that covers the upper side surface of the buried pipe 1 as shown in FIG. A detachable closing member 10 inserted into the upper opening of the buried pipe 1 may be used as shown in FIG. In the case of this closure member 10, it is good also as a structure by which the screw is cut in the insertion part 10a. Further, when the buried pipe 1 is provided under the foundation, a closing member 11 as shown in FIG. 1B may be welded to the upper opening of the buried pipe 1 and closed. The material of these closing members may be the same material as the buried pipe or plastic.

  In the above-described embodiment, the configuration in which the guide portion such as the cutout portion 3 and the hole portion 4 is provided on the upper side surface of the buried pipe 1 on the side opposite to the buried side is exemplified. It is not limited to. For example, it is good also as a structure which provided the guide part for guiding and protecting piping to the inside and outside of a buried pipe in the side surface of the obstruction | occlusion member which blocks the upper opening of the said buried pipe.

  Specifically, the guide portion provided on the side surface of the closing member may be a cutout portion 5a provided by cutting out the side surface of the closing member 5 as shown in FIG. As shown in b), it may be a hole 6a in which the side surface of the closing member 6 is formed.

  With this configuration, by providing the notch 5a and the hole 6a as guide portions on the side surfaces of the closing members 5 and 6, respectively, when replacing the pipe inside the tube, the detachable closing member By removing 5 and 6, it is possible to take in and out the pipe 2 from the upper opening and replenish and replace the filling material inside the buried pipe, so it is possible to deal with deterioration and clogging of the pipe arranged inside the pipe, etc. Maintenance is possible and maintenance work can be easily performed.

  Even when a load is applied to the upper part of the buried pipe 1, the pipe 2 is protected by the notch 5a and the hole 6a, and therefore the pipe 2 is crushed by the load applied to the upper part of the buried pipe 1. Can be prevented.

  Further, since the upper opening of the buried pipe 1 is closed by the closing members 5 and 6, it is possible to prevent soil and the like from entering the buried pipe 1 from the upper opening of the buried pipe 1. Further, since the pipe 2 is drawn out from the side surfaces of the closing members 5 and 6 by the notch part 5a and the hole part 6a as the guide part and does not protrude from the upper part of the buried pipe 1, the buried pipe 1 is located at a place other than the bottom of the foundation. In the case where it is arranged, the space above the buried pipe can be used effectively.

  Furthermore, by using a closing member that closes the upper opening of the buried pipe, the guide portion such as the notch 5a and the hole 6a is provided on the side surface of the closing member so that the guide portion is not provided. An existing buried pipe can be used, and when the existing buried pipe is used, there is no need for processing, and there is no need to separately provide a separate member having the guide portion. I can prevent it.

  In addition, as described above, a steel pipe pile as an existing pile used for the foundation of a building can be used as a buried pipe for heat exchange according to the present invention. However, when this steel pipe pile is used as a buried pipe for heat exchange, It is preferable to use a steel pipe pile having a spiral wing for screwing a pile having an outer diameter larger than the outer diameter of the pile main body (specifically, about 1.5 to 3 times) on the outer periphery of the main body. Moreover, it is preferable to perform the construction method of the said steel pipe pile by the rotation embedding method which does not generate | occur | produce the residual soil. By constructing the steel pipe pile by the rotational embedding method, the earth and sand that has been excavated and softened at the time of embedding are pressed against the side of the pile without being discharged and compressed, so that the density of the earth and sand around the pile increases and the thermal conductivity increases. For this reason, the efficiency of heat exchange is improved.

  Moreover, as shown in FIG. 4, the heat exchange pipe installed inside the heat exchange buried pipe includes a feed pipe 2a for flowing the heat medium into the buried pipe and a return pipe 2b for flowing the heat medium from the pipe. ing. As shown in FIG. 4 (a), the pipe for heat exchange in the buried pipe is provided with the feed pipe 2a and the return pipe 2b separately, and the ends of the pipes 2a and 2b in the buried pipe 1 are filled. Although the structure filled with (the same thing as a heat medium) may be sufficient, the structure where the said feed pipe 2a and the said return pipe 2b are connected continuously as shown in FIG.4 (b) is more preferable.

  In addition, it is preferable that the heat exchanging pipe in the buried pipe has a large surface area per unit length and can be easily bent as compared with a pipe having no unevenness. In particular, as shown in FIG. 4C, it is preferable to use a bellows-like pipe 2 such as a flexible pipe whose pipe wall shape is corrugated in the length direction, and it is easy to increase the endothermic area and bend it. By using this piping, even when heat exchange piping is put into the buried pipe at the time of construction, it is not necessary to connect the heat exchange pipe in the buried pipe, and it is also necessary to prepare a dedicated U-shaped pipe at the folded part Absent. Moreover, by making the pipe 2 into a corrugated shape as shown in FIG. 4C, the flow of the heat medium passing through the inside of the pipe becomes a turbulent flow, and the efficiency of heat exchange is further increased.

  In addition, the material for the heat exchange pipe may be arbitrarily selected from metal and plastic, but preferred is a metal pipe, such as a copper pipe, a stainless steel pipe, an aluminum pipe, and a steel pipe. It is done. Among these, a stainless steel tube is particularly preferable. Further, the number of pipes passing through one buried pipe may be plural.

  In addition, the shape of the pipe in the buried pipe is a normal one having no irregularities, a pipe wall shape having a corrugated shape in the length direction as shown in FIG. 4C (flexible pipe, etc.), pipe circumference The thing etc. which attached the heat sink (fin) to the surface are mentioned. Particularly preferred is a bellows-like pipe as described above, and the uneven shape increases the surface area of the heat exchange, and the flow of the heat medium in the pipe becomes a turbulent flow, thereby increasing the heat exchange efficiency. In addition, since bellows-like piping such as flexible pipes are scrolls, they are easy to transport to the construction site and have excellent bending workability, so they are excellent in workability such as putting in and out of buried pipes. .

  In addition, when constructing a system as a geothermal heat utilization apparatus using the above-described heat exchanging buried pipe according to the present invention, for example, as shown in FIG. , A pipe 2 of the buried pipe 1 for heat exchange, a pipe 7 in a building, a circulation pump 8 for circulating a heat medium in the pipe, and the like. The circulation pump 8 only needs to have sufficient ability to circulate the heat medium in the pipe. Examples of places where piping is installed in buildings include walls, floors, ceilings, roofs, and foundations. The piping in the building may be incorporated in a panel such as a floor heating hot water panel. In addition, the piping in the building and the piping of the buried pipe for heat exchange may be connected by piping, or, if necessary, from the ground between the piping in the building and the pipe from the buried pipe for heat exchange. A boiler or a heat pump that uses the obtained heat as a heat source may be incorporated as a system. What is necessary is just to determine arbitrarily the piping which connects the piping in a building, and the piping of the buried pipe for heat exchange according to a use aspect regarding a material and a piping diameter.

  When the above-described buried pipe for heat exchange according to the present invention is used in a geothermal heat utilization device, the buried pipe uses a foundation pile buried under the foundation of the building for ground improvement as described above. Alternatively, a buried pipe buried in a place other than the bottom of the building may be used.

  For example, as shown in FIG. 6, when a foundation pile buried under a foundation 13 of a building is used as the buried pipe 1 for heat exchange, a large notch portion 3 is provided as the guide portion. The configuration. In this case, since the buried pipe 1 (foundation pile) buried under the building foundation 13 is a place where a large force is applied, the closing member that closes the upper opening of the buried pipe 1 has a high rigidity so that the foundation 13 is covered as shown in FIG. The closing member 11 having a shape that is widely received is used to weld the closing member 11 to the upper portion of the buried pipe. With this configuration, even when the pipe 2 inside the pipe is replaced under the foundation 13, the pipe from the pipe pit 14 to the inside and outside of the buried pipe 1 through the notch 3 is exchanged. 2 can be taken in and out and the filling material inside the buried pipe can be replenished / replaced, so that it is possible to deal with deterioration and clogging of the pipes arranged inside the pipe, and maintenance can be performed easily. It can be carried out.

  Examples of places other than under the foundation include vacant lots around buildings other than under the foundation, buildings such as gardens, roads, parking lots, and the like. Even in such a place, when exchanging the pipe 2 inside the pipe, the pipe can be taken in and out from the upper opening of the buried pipe or the above-mentioned guide part. Maintenance is possible, such as being able to cope with clogging, and maintenance work can be easily performed.

The schematic diagram which shows the notch which the buried pipe for heat exchange which concerns on this invention has The schematic diagram which shows the hole which the buried pipe for heat exchange which concerns on this invention has The schematic diagram which shows the guide member which the buried pipe for heat exchange which concerns on this invention has Schematic diagram showing an example of piping for heat exchange Schematic diagram showing an example of the system configuration of a geothermal heat utilization device The schematic diagram which shows an example of the structure which has laid the underground pipe for heat exchange which concerns on this invention under the building foundation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Embedded pipe 2 for heat exchange ... Pipe 2a for heat exchange ... Feed pipe 2b ... Return pipe 3 ... Notch part 4 ... Hole part 5 ... Closure member 5a ... Notch part 6 ... Obstruction member 6a ... Hole part 7 ... Pipe 8 ... Circulating pump 9 ... Closing member 10 ... Closing member 10a ... Inserting portion 11 ... Closing member 12 ... Guide member 13 ... Base 14 ... Piping pit

Claims (2)

In order to use the heat in the ground, it is a buried pipe for heat exchange that is used by burying at least a part in the ground,
The buried pipe has an opening on the side buried in the ground, and has a detachable closing member that closes the upper opening opposite to the buried side. What is the buried side? on the upper side surface of the opposite side of the buried pipe, the guide portion of the heat medium is guided to and protect the pipe flowing into the embedded tube outer provided, wherein the guide portion, by cutting an upper end of the buried pipe A buried pipe for heat exchange, which is a notch provided . In order to use the heat in the ground, it is a buried pipe for heat exchange that is used by burying at least a part in the ground,
The buried pipe has an opening on the side buried in the ground, and has a detachable closing member that closes the upper opening on the side opposite to the buried side, and on the side surface of the closing member, a guide portion for the heat medium to protect the pipe for flow guide to and into the buried pipe outer provided, wherein the guide portion, you wherein a cutout portion provided by cutting the side of the closing member Buried pipe for heat exchange.

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