JP2008096063A - Foundation pile serving also as underground heat exchanger, installing method for underground heat exchanger, and underground heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extensively reduce installation costs by easily and positively installing an underground heat exchanger. <P>SOLUTION: In the foundation pile 1 serving also as the underground heat exchanger, a heat exchange pipe 20 is attached to a hollow part 11 of a ready-made hollow pile body 10 comprising a cylinder extending along a center axis O. The ready-made hollow pile body 10 and the heat exchange pipe 20 are provided with a lifting preventing means for preventing lifting of the heat exchange pipe 20, and cover members 26, 27 for preventing intrusion of foreign matter into the hollow part 11 are attached to an upper end opening and a lower end opening of the ready-made hollow pile body 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a foundation pile that is used by being placed in the ground when constructing a building, and has a function as a ground heat exchanger that can be used as a heat source for air conditioning equipment of the building. Underground heat exchanger combined foundation pile, installation method of underground heat exchanger using this underground heat exchanger combined foundation pile, and underground heat exchange buried by this underground heat exchanger installation method It is about a vessel.

As is well known, when building a building structure on soft ground, etc., a plurality of foundation piles are placed in the ground, and the building structure is built on this foundation pile to stabilize the foundation of the building structure. We are trying to make it. This foundation pile generally has a cylindrical shape.
By the way, in recent years, in the foundation structure as described above, a heat exchanger pipe is provided inside the foundation pile, and the foundation pile is provided with the function of the underground heat exchanger. Has been. This foundation heat exchanger combined foundation pile circulates a heat medium in the heat exchange pipe after constructing the building, and through this heat medium, the ground temperature at the periphery of the foundation pile is substantially the same. The heat of the foundation pile is recovered, and this heat is used to operate various cooling and heating devices for cooling and heating, hot water supply, and snow melting.

Here, the following is proposed as a method of disposing the heat exchange pipe inside the foundation pile and installing the underground heat exchanger.
Patent Document 1 proposes a method in which after a foundation pile is driven into the ground, a heat exchange pipe into which water is injected is inserted, and a filler is filled in the hollow portion to fix the heat exchange pipe. ing.
Patent Document 2 proposes a method in which a heat exchange pipe is attached in advance to the inner peripheral surface of a cylindrical foundation pile, and the foundation pile is placed in the ground.
Furthermore, Patent Document 3 proposes a method in which a pipe for heat exchange is embedded in advance inside the foundation pile and the foundation pile is placed in the ground.
JP 2004-233031 A JP 2003-148079 A JP 2005-69507 A

  By the way, in patent document 1, since the pipe for heat exchange is inserted and fixed after driving a foundation pile, there are many work in a construction site, and much time and labor are required for installation of a geothermal heat exchanger. In addition, water is injected into the heat exchange pipe so that the heat exchange pipe does not rise, so when injecting the heat medium into the heat exchange pipe, the air is locked and air is vented. There was a problem that it became difficult.

  Moreover, in patent document 2, since the cylindrical foundation pile is driven in the ground, earth and sand may enter into a hollow part from the lower end opening part of a foundation pile, and there exists a possibility that the pipe for heat exchange may be damaged. was there. In addition, there has been a problem that the earth and sand entering the hollow portion becomes an obstacle and the hollow portion cannot be filled with the filler.

  Furthermore, in patent document 3, since the foundation pile has a solid structure, in the case of a large diameter and a long length, the weight becomes heavy, and it is necessary to use a large heavy machine when placing the foundation pile. The installation cost of the underground heat exchanger will increase. Moreover, since the connection part of the heat exchange pipe is provided in the upper end of the foundation pile, this foundation pile cannot be embedded deeper than the ground surface. Therefore, it is necessary to perform root cutting before placing the foundation pile. In this case, it is necessary to perform rooting work in a wide range in order to carry large heavy machinery into the rooted part, and much time and labor are required to install the underground heat exchanger.

  The present invention has been made in view of the above-described circumstances, and is a ground heat exchanger combined use foundation pile capable of easily and reliably installing a ground heat exchanger, a ground heat exchanger An object is to provide an installation method and an underground heat exchanger.

  In order to achieve the above-mentioned object, the underground heat exchanger combined foundation pile according to the present invention has a heat exchange pipe attached to the hollow portion of a hollow hollow pile body that extends along the central axis. A foundation heat exchanger combined use foundation pile, wherein the ready-made hollow pile body and the heat exchange pipe include a levitation preventing means for preventing the heat exchange pipe from rising, and an upper end opening of the ready-made hollow pile body And the cover member for preventing the penetration | invasion of the foreign material to the said hollow part is mounted | worn with the lower end opening part, It is characterized by the above-mentioned.

  In the ground heat exchanger combined foundation pile of this structure, since the pipe for heat exchanger is attached to the hollow part of the ready-made hollow pile body, by placing this foundation pile in the ground, the underground heat exchanger Can be buried. Moreover, since it has a hollow part, the weight is not heavier than necessary, and it is not necessary to use a large heavy machine when placing. Therefore, the installation cost of the underground heat exchanger can be significantly reduced.

  In addition, since the heat exchanger pipe is provided with a floating prevention means, the heat exchange pipe does not rise when the filler is injected into the hollow portion. Therefore, it is not necessary to inject water into the heat exchanger pipe, and air can be easily removed when the heat medium is injected into the heat exchanger pipe.

In addition, since the cover member is attached to the lower end opening of the cylindrical ready-made hollow pile body, when this foundation pile is placed, earth and sand do not enter the hollow portion, and the heat attached to the hollow portion The replacement pipe can be protected. Furthermore, the hollow portion can be filled with the filler smoothly.
Furthermore, since the cover member is also attached to the upper end opening of the ready-made hollow pile body, even if this foundation pile is driven to the lower side of the ground surface, earth and sand do not enter the hollow portion. Therefore, the placing work can be performed in the same manner as a normal pile, and the installation cost of the underground heat exchanger can be further reduced.

Here, the upper end opening portion of the ready-made hollow pile body may be configured to allow the cover member to be attached and detached, and the lower end opening portion of the ready-made hollow pile body may be configured to be capable of attaching the cover member.
In this case, for example, in a factory that manufactures pile bodies, heat exchange pipes are disposed in the hollow portion, and the cover member is mounted on the upper end opening and the lower end opening, and then carried into the construction site for placement. May be. Moreover, it can carry in to a construction site in the state which attached the cover member only to the lower end opening part, and can also be installed by attaching a cover member to the upper end opening part in the construction site. Furthermore, it is possible to carry in the construction site without attaching the cover member to both the upper end opening and the lower end opening, and to install the cover member at the upper end opening and the lower end opening at the construction site. .

  Moreover, it is good also considering the said ready-made hollow pile body as a ready-made concrete pile body. In this case, the underground heat exchanger combined foundation pile can be configured using a centrifugally formed high strength concrete pile (PHC pile) or the like. Further, the cover member can be easily attached to and detached from the upper end opening and the lower end opening.

The heat exchanging pipe has a descending channel through which the heat medium flows from above to below and an ascending channel through which the heat medium flows from below to above, and the descending channel and the ascending channel In the cross section orthogonal to the central axis, the flow paths may be arranged at intervals so as to face each other across the central axis.
In this case, heat exchange between the heat medium flowing through the ascending channel and the heat medium flowing through the descending channel can be prevented, and the underground heat can be efficiently recovered.

  Here, a spacer for securing an interval between the descending channel and the ascending channel may be disposed on the heat exchange pipe. In this case, the space between the descending flow path and the ascending flow path can be maintained even when the hollow portion is filled with the filler.

  Moreover, the installation method of the underground heat exchanger which concerns on this invention is an installation method of the underground heat exchanger using the underground pile which also uses an underground heat exchanger, Comprising: The said underground of the state which mounted | wore with the said cover member After placing the heat exchanger combined foundation pile to a position deeper than the ground surface, rooting is performed to expose the upper end portion of the underground heat exchanger combined foundation pile, and the cover member provided in the upper end opening And connecting a pipe to the open end of the heat exchange pipe to inject a heat medium therein, and filling the hollow portion with a filler to fix the heat exchange pipe. .

  According to the installation method of the underground heat exchanger having this configuration, root cutting is performed after the foundation pile is driven to a position deeper than the ground surface, and therefore, the root cutting work can be suppressed to the minimum necessary. Therefore, the installation cost of the underground heat exchanger can be significantly reduced.

  Furthermore, the underground heat exchanger according to the present invention is characterized in that it is buried in the ground by the above-described installation method of the underground heat exchanger.

  ADVANTAGE OF THE INVENTION According to this invention, the ground heat exchanger combined foundation pile which can install a ground heat exchanger simply and reliably, the installation method of a ground heat exchanger, and a ground heat exchanger are provided. be able to.

Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 to FIG. 3 show a ground heat exchanger combined foundation pile that is a first embodiment of the present invention.
The underground heat exchanger combined foundation pile 1 according to the present embodiment includes a ready-made concrete pile body 10 having a substantially cylindrical shape and a heat exchange pipe 20 disposed inside the ready-made concrete pile body 10.

The ready-made concrete pile body 10 is a high-strength concrete pile (PHC pile) formed by centrifugal force. The outer shape has a cylindrical shape extending along the central axis O, and includes a hollow portion 11 opened toward the upper end side and the lower end side.
An iron fixing bar 12 (rebar) is welded to the lower end opening of the ready-made concrete pile body 10 so as to extend in the diameter direction of the ready-made concrete pile body 10.

  The heat exchange pipe 20 has a downward flow path 21 through which the heat medium flows from the upper end side of the ready-made concrete pile body 10 toward the lower end side, and the heat medium flows out from the lower end side of the ready-made concrete pile body 10 toward the upper end side. And a connecting channel 23 that connects the descending channel 21 and the ascending channel 22 to each other. In the present embodiment, the descending channel 21 and the ascending channel 22 are arranged in parallel to each other, and the connecting channel 23 is arranged so as to be orthogonal to the descending channel 21 and the ascending channel 22. The whole 20 has a substantially U-shape. In addition, a plurality of spacer fittings 24 are provided between the descending channel 21 and the ascending channel 22 in the longitudinal direction of the descending channel 21 and the ascending channel 22 (this embodiment). Then, three are provided as shown in FIG.

  Such a heat exchange pipe 20 is inserted into the hollow portion 11 from the lower end opening of the ready-made concrete pile body 10, and the descending flow path 21 and the rising flow path 22 are parallel to the central axis O of the ready-made concrete pile body 10. So as to extend to each other and to be opposed to each other across the central axis O. Thereby, these downward flow path 21 and upward flow path 22 are arrange | positioned so that the inner peripheral surface of the ready-made concrete pile body 10 may be followed.

  Further, in order to prevent the heat exchange pipe 20 from floating, the connection flow path 23 is bound to the fixing bar 12 by a wire or the like. Furthermore, each open end of the downward flow path 21 and the upward flow path 22 is disposed so as to face the upper end opening of the ready-made concrete pile body 10, and a cap 25 is attached to these open ends.

And the bottom opening part 26 of the ready-made concrete pile body 10 is provided with the iron-shaped bottom cover 26 which makes | forms disk shape as a cover member for preventing the penetration | invasion of the foreign material to the hollow part 11. As shown in FIG. A plurality of mounting bolts 28 are inserted into the bottom lid 26, and these mounting bolts 28 are fixed by being screwed into bolt holes formed in the lower end surface of the ready-made concrete pile body 10.
Moreover, the upper end opening part of the ready-made concrete pile body 10 is provided with an iron canopy 27 having a disk shape as a cover member for preventing foreign matter from entering the hollow part 11. A plurality of mounting bolts 28 are inserted into the canopy 27, and these mounting bolts 28 are screwed into bolt head reinforcement connecting bolt holes formed on the upper end surface of the ready-made concrete pile body 10. It is fixed by that.

The underground heat exchanger combined foundation pile 1 having such a configuration is placed in the ground as follows, and the underground heat exchanger is embedded.
From the lower end side of the ready-made concrete pile body 10, it lays in the ground. Here, like a normal PHC pile, the ready-made concrete pile body 10 is driven to a position deeper than the ground surface and completely buried in the ground. Then, root cutting work is performed, the upper end part of the ready-made concrete pile body 10 is exposed, and the canopy 27 is removed. Then, the cap 25 attached to the open ends of the descending flow path 21 and the ascending flow path 22 of the heat exchange pipe 20 is removed and connected to a connection pipe (not shown), and a heat medium is placed inside the heat exchange pipe 20. Inject. And the hollow part 11 is filled with fillers, such as mortar, for example, and the pipe 20 for heat exchange is fixed completely.
A pile head reinforcing line is connected to the bolt hole after the canopy 27 is removed.

  According to the underground heat exchanger combined foundation pile 1 according to this embodiment, since the heat exchange pipe 20 is inserted into the hollow portion 11 of the ready-made concrete pile body 10, the ready-made concrete pile body 10 is driven. In this way, underground heat exchangers can be buried. Moreover, since the ready-made concrete pile body 10 is a PHC pile which has the hollow part 11, it can be laid without using a large sized heavy machine. Therefore, the installation cost of the underground heat exchanger can be significantly reduced.

  Moreover, since the heat exchange pipe 20 is bound to a fixing bar 12 provided at the lower end of the ready-made concrete pile body 10 by a wire or the like and is provided with a floating prevention means, a filler such as mortar is provided in the hollow portion 11. The heat exchanging pipe 20 does not float up when charging. Therefore, it is not necessary to inject water into the heat exchange pipe 20, and air can be easily removed when the heat medium is injected into the heat exchange pipe 20.

Moreover, since the bottom cover 26 is attached to the lower end opening part of the ready-made concrete pile body 10, when the underground heat exchanger combined use foundation pile 1 is laid, earth and sand do not enter the hollow part 11, and it is hollow. The heat exchange pipe 20 inserted into the portion 11 can be protected, and the hollow portion 11 can be filled with the filler smoothly.
Furthermore, since the canopy 27 is attached to the upper end opening of the ready-made concrete pile body 10, earth and sand etc. enter the hollow portion 11 even if the underground heat exchanger combined foundation pile 1 is driven to the lower side of the ground surface. There is nothing. Therefore, the placement work can be performed in the same manner as a normal PHC pile, and the installation cost of the underground heat exchanger can be reduced.

Further, since the descending flow path 21 and the ascending flow path 22 of the heat exchange pipe 20 are arranged in parallel to each other so as to be parallel to the central axis O and opposed to each other across the central axis O. In addition, heat exchange between the heat medium flowing through the ascending flow path 22 and the heat medium flowing through the descending flow path 21 can be prevented, and the underground heat can be efficiently recovered.
Furthermore, in this embodiment, since a plurality of spacer fittings 24 are provided, the interval between the descending channel 21 and the ascending channel 22 can be maintained even if the hollow portion 11 is filled with the filler.

  Furthermore, in this embodiment, in the factory which manufactures ready-made concrete pile body 10 (PHC pile), the state which inserted the heat exchange pipe 20 in the hollow part 11, performs a pressure test, and attached the bottom cover 26 and the canopy 27. In the construction site, it is only necessary to perform the driving work like a normal PHC pile. Therefore, the airtightness of the heat exchange pipe 20 can be ensured, and the quality of the underground heat exchanger can be dramatically improved.

Next, a second embodiment of the present invention will be described with reference to the attached drawings. In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and detailed description is abbreviate | omitted. In FIG. 4, the underground heat exchanger combined foundation | foundation pile 1 which is the 2nd Embodiment of this invention is shown.
The underground heat exchanger combined foundation pile 1 according to this embodiment includes a ready-made concrete pile body 10 having a substantially cylindrical shape as in the first embodiment, and a heat exchanger arranged inside the ready-made concrete pile body 10. And a pipe 20.

In the present embodiment, the arrangement of the heat exchange pipes 20 is different from that of the first embodiment. That is, as shown in FIG. 4, the descending flow path 21 and the ascending flow path 22 of the heat exchanging pipe 20 are spirally arranged along the inner peripheral surface of the ready-made concrete pile body 10. Here, the descending channel 21 and the ascending channel 22 are arranged at positions facing each other across the central axis O in a cross section orthogonal to the central axis O.
Furthermore, a second fixing bar 13 (rebar) extending in the diameter direction of the ready-made concrete pile body 10 is disposed at the upper end portion of the ready-made concrete pile body 10, and the descending flow path 21 and the ascending flow path 22 are It is bound to the second fixing bar 13 by a wire or the like.

  According to the ground heat exchanger combined foundation pile 1 having this configuration, the descending flow path 21 and the ascending flow path 22 are arranged spirally along the inner peripheral surface of the ready-made concrete pile body 10, respectively. The surface area inside becomes large and the underground heat can be efficiently recovered. Further, since the descending channel 21 and the ascending channel 22 are arranged at positions facing each other across the central axis O in the cross section orthogonal to the central axis O, the descending channel 21 and the ascending channel 22 descend with the heat medium flowing through the ascending channel 22. Heat exchange with the heat medium flowing through the flow path 21 can be prevented. In addition, since the downward flow path 21 and the upward flow path 22 are bound to the second fixing bar 13 provided at the upper end portion of the ready-made concrete pile body 10 by a wire or the like, the downward flow path arranged in a spiral shape It can prevent that 21 and the raising flow path 22 deform | transform so that the twist may be eliminated.

Next, a third embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the component same as 1st, 2nd embodiment, and detailed description is abbreviate | omitted. FIG.5 and FIG.6 shows the underground heat exchanger combined foundation pile 1 which is the 3rd Embodiment of this invention.
The underground heat exchanger combined foundation pile 1 according to the present embodiment is disposed in a ready-made concrete pile body 10 having a substantially cylindrical shape and the ready-made concrete pile body 10 as in the first and second embodiments. And a heat exchange pipe 20.

  In the present embodiment, the arrangement of the heat exchange pipes 20 is different from those in the first and second embodiments. That is, as shown in FIGS. 5 and 6, the heat exchange pipe 20 includes a first descending flow path 21A, a first ascending path 22A, a first connecting channel 23A connecting them, and a second descending path. 21B, the 2nd ascending flow path 22B, and the 2nd connection flow path 23B which connects these. The first ascending channel 22A and the second descending channel 21B are connected to each other by a connection pipe 29. The cap 25 is attached so that the opening end of the first descending flow path 21 </ b> A and the opening end of the second ascending flow path 22 </ b> B are directed to the upper end opening of the ready-made concrete pile body 10.

  According to the underground heat exchanger combined foundation pile 1 having this configuration, since the two descending channels 21A and 21B and the two ascending channels 22A and 22B are provided, the surface area in the ground increases, Medium heat can be efficiently recovered.

As mentioned above, although the underground heat exchanger combined foundation | foundation pile which is embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention. .
For example, as a ready-made hollow pile body, it has been described as applied to a ready-made concrete pile body having a cylindrical shape, but is not limited to this, may be composed of other materials such as a steel pipe, or an elliptical cross section A cylindrical body having a shape or a rectangular shape may be used.

  In addition, a fixing bar is provided at the lower end opening of the ready-made concrete pile body, and the heat exchange pipe is tied to this with a wire or the like, so that it is configured to prevent the heat exchange pipe from rising, However, the present invention is not limited to this. For example, other floating prevention means such as fixing a heat exchanging pipe to the inner peripheral surface of the ready-made concrete pile body with a mounting bracket or the like may be provided.

It is side surface sectional drawing of the underground heat exchanger combined foundation pile which is the 1st Embodiment of this invention. It is a X direction arrow line view in FIG. It is a Y direction arrow directional view in FIG. It is side surface sectional drawing of the underground heat exchanger combined foundation pile which is the 2nd Embodiment of this invention. It is side surface sectional drawing of the underground heat exchanger combined foundation pile which is the 3rd Embodiment of this invention. It is the figure which looked at the hollow part of the underground heat exchanger combined foundation pile shown in FIG. 5 from upper direction.

Explanation of symbols

1 Ground heat exchanger combined foundation pile 10 Ready-made concrete pile body (Pre-made hollow pile body)
DESCRIPTION OF SYMBOLS 11 Hollow part 12 Fixing bar 20 Heat exchange pipe 21 Downflow path 22 Upflow path 24 Spacer metal fitting (spacer)
26 Bottom cover (cover member)
27 Canopy (cover member)

Claims (7)

A ground heat exchanger combined foundation pile in which a pipe for heat exchange is attached to a hollow portion of a ready-made hollow pile body having a cylindrical shape extending along a central axis,
The ready-made hollow pile body and the heat exchange pipe are provided with a floating prevention means for preventing the heat exchange pipe from floating,
A ground heat exchanger combined foundation pile, wherein a cover member for preventing entry of foreign matter into the hollow portion is attached to the upper end opening and the lower end opening of the ready-made hollow pile body.   The upper end opening of the ready-made hollow pile body is configured to be detachable from the cover member, and the lower end opening of the ready-made hollow pile body is configured to be capable of attaching the cover member. The underground heat exchanger combined use foundation pile according to claim 1 characterized by things.   The ground heat exchanger combined foundation pile according to claim 1 or 2, wherein the ready-made hollow pile body is a ready-made concrete pile body. The heat exchange pipe has a downward flow path through which the heat medium flows from above to below, and an upward flow path through which the heat medium flows from below to above,
The descending flow path and the ascending flow path are arranged at an interval so as to face each other across the central axis in a cross section perpendicular to the central axis. The underground heat exchanger combined use foundation pile in any one of claim | item 3.   The underground heat exchanger combined foundation according to claim 4, wherein a spacer for securing a space between the descending flow path and the ascending flow path is disposed in the heat exchange pipe. Pile. It is the installation method of the underground heat exchanger using the underground heat exchanger combined foundation pile in any one of Claims 1-5,
After placing the underground heat exchanger combined foundation pile with the cover member mounted to a position deeper than the ground surface, root cutting is performed to expose the upper end portion of the underground heat exchanger combined foundation pile. Removing the cover member provided at the upper end opening, connecting a pipe to the opening end of the heat exchanging pipe, injecting a heat medium therein, and filling the hollow portion with a filler; A method of installing a ground heat exchanger characterized by fixing a replacement pipe.   The underground heat exchanger characterized by being embedded in the ground by the installation method of the underground heat exchanger according to claim 6.

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