JP6225231B2 - Heat exchanger construction method - Google Patents

Description

  The present invention relates to a method for constructing a heat exchanger that uses geothermal heat.

  There is known a technique of using underground heat by burying a heat exchanger in the ground and exchanging heat through a heat medium circulating inside the heat exchanger. Since the heat exchanger is buried in the ground for a long time, a resin heat exchanger may be employed from the viewpoint of preventing corrosion of the outer surface of the heat exchanger. Resins have the advantage of being excellent in corrosion resistance and earthquake resistance, but they have the disadvantage of low wear resistance. For this reason, when the resin heat exchanger comes into contact with the hole wall or the like, the surface of the heat exchanger may be damaged, and the heat exchanger may be damaged.

  Conventionally, a method of embedding such a resin heat exchanger so as not to be damaged is known. For example, Patent Document 1 discloses a technique in which a sheet-like buffer member is provided on the outer periphery of a heat exchanger, and then the heat exchanger is inserted into a tube body that is installed by excavating the ground.

JP 2009-68749 A

  However, since the resin heat exchanger is packed in a bent state at the time of transportation, it may have a so-called bending fold. In the method described in Patent Document 1, when the heat exchanger is bent, the heat exchanger easily comes into contact with the hole wall when the heat exchanger is embedded. When a heat exchanger contacts a hole wall, a hole wall will collapse and there exists a possibility that the workability of a heat exchanger may deteriorate. Further, in the method described in Patent Document 1, since the outer periphery of the heat exchanger is only covered with a sheet-like buffer member, damage to the heat exchanger may not be avoided when a large impact is applied. Moreover, in the said method, although the buffer member is pulled up with a string etc. and removed after insertion of a heat exchanger, the buffer member may not be removed depending on construction conditions.

  Then, the subject of this invention is providing the heat exchanger construction method which can improve the workability of a heat exchanger and can prevent the damage of a heat exchanger.

  The heat exchanger construction method according to the present invention includes a drilling step for excavating the ground to form a drilling hole, and a state in which a resin heat exchanger for circulating a heat medium is inserted into a cylindrical guide tube Thus, an insertion step of inserting the heat exchanger and the guide tube into the hole and a filling step of filling the space in the hole with the filler after the insertion step are included.

  In the heat collecting piping construction method according to the present invention, the heat exchanger and the guide tube are inserted into the drilling hole in a state where the heat exchanger is inserted into the cylindrical guide tube. For this reason, even when the heat exchanger is bent, the heat exchanger can be inserted into the drilling hole in a state in which the heat exchanger is contained in the guide tube and the shape is maintained. Can be prevented. In addition, since the heat exchanger is inserted into the drilling hole while being covered with the guide tube, it is possible to prevent the heat exchanger from directly contacting the hole wall or the like, and to prevent damage to the heat exchanger. it can. Therefore, according to such a method, the workability of the heat exchanger can be improved, and damage to the heat exchanger can be prevented.

  In the heat exchanger construction method according to the present invention, in the insertion step, the heat exchanger and the guide tube are cut in a state in which the load transmission member for transmitting the load of the guide tube to the heat exchanger is connected to the heat exchanger. It may be inserted into the hole. In this case, since the load of the guide tube is transmitted to the heat exchanger, it is possible to prevent the heat exchanger from floating due to the groundwater inside the drilling hole, and the heat exchanger is installed at a desired depth. be able to.

  Moreover, in the heat exchanger construction method according to the present invention, the load transmission member is a rope member having a suspended portion that is suspended by a suspension device and a connecting portion that is connected to the heat exchanger, It may be provided via the lower end part of the guide pipe between the suspended part and the connection part. In this case, since the load of the guide tube is transmitted from the end of the guide tube to the heat exchanger through the rope material, the heat exchanger can be prevented from rising due to the groundwater inside the drilling hole. A heat exchanger can be installed at the desired depth. In addition, since one end of the rope member is connected to the heat exchanger, it does not get in the way when the guide tube is pulled out.

  Moreover, in the heat exchanger construction method according to the present invention, the heat exchanger and the guide tube are elongated, and the load transfer member is a guide tube in plan view from the longitudinal direction of the heat exchanger and the guide tube. The locking member may have a portion overlapping with the locking member, and the locking member may be provided at a lower end portion of the heat exchanger. In this case, since the load of the guide tube is transmitted to the heat exchanger through the locking member by the contact of the guide tube with the locking member, the heat exchanger floats due to the ground water inside the drilling hole. The heat exchanger can be installed at a desired depth. Further, since the locking member is provided in the heat exchanger, it does not get in the way when the guide tube is pulled out.

  In the heat exchanger construction method according to the present invention, the upper surface of the locking member extends along the outer surface of the heat exchanger, and the distance between the outer surface of the heat exchanger and the inner wall of the guide tube is set to a predetermined distance. A protrusion to maintain may be provided. In this case, since the heat exchanger is prevented from coming into contact with the inner wall of the guide tube, the heat exchanger can be more reliably prevented from being damaged.

  In the heat exchanger construction method according to the present invention, the guide tube may be made of metal. In this case, since the guide tube has high rigidity, it is possible to reliably prevent the heat exchanger from being damaged.

  Moreover, in the heat exchanger construction method which concerns on this invention, the unevenness | corrugation may be provided in the surface of the heat exchanger. In this case, the contact area between the heat exchanger and the ground can be increased, and the heat exchange efficiency of the heat exchanger can be improved.

  Moreover, in the heat exchanger construction method according to the present invention, the guide tube may be removed from the drilling hole while filling the filler in the filling step. In this case, since the guide tube is pulled out in parallel with the filling of the filler, it is possible to prevent the guide tube from being pulled out by a restraining force from the side of the filler. Furthermore, when the guide tube is pulled out, the filler flows in from the side surface of the heat exchanger, so that it is possible to reliably fill the recess in the heat exchanger and prevent the heat exchange efficiency from being lowered. it can.

  The heat exchange structure according to the present invention includes a drilling hole formed in the ground, a heat exchanger inserted into the drilling hole while being inserted into the cylindrical guide tube, and heat between the heat exchanger and the ground. And a filler for exchange. The heat exchange structure according to the present invention is formed by inserting a heat exchanger and a guide tube into a drilling hole in a state where the heat exchanger is inserted into a cylindrical guide tube. For this reason, even when the heat exchanger is bent, the heat exchanger can be inserted into the drilling hole in a state in which the heat exchanger is contained in the guide tube and the shape is maintained. Can be prevented. In addition, since the heat exchanger is inserted into the drilling hole while being covered with the guide tube, it is possible to prevent the heat exchanger from directly contacting the hole wall or the like, and to prevent damage to the heat exchanger. it can.

  Further, the heat exchange structure according to the present invention may be formed by installing the heat exchanger in the hole and then pulling out the guide tube from the hole. In this case, the drawn guide tube can be reused when forming another heat exchange structure.

  The heat exchange structure according to the present invention further includes a load transmission member attached to the heat exchanger, and when the heat exchanger is inserted into the drilling hole in a state of being inserted into the guide tube, the load transmission member guides the guide tube. The load may be transmitted to the heat exchanger. In this case, since the load of the guide tube is transmitted to the heat exchanger by the load transmission member, the heat exchanger is prevented from rising due to the groundwater inside the drilling hole, and the heat exchanger is installed at a desired depth. The formed heat exchange structure is formed.

  The heat exchange construction unit according to the present invention is a heat exchange construction unit used when forming the heat exchange structure, and is a guide tube and a heat exchanger that is inserted into the drilling hole while being inserted into the guide tube. And comprising. According to the heat exchange construction unit according to the present invention, the heat exchanger and the guide tube are inserted into the drilling hole in a state where the heat exchanger is inserted into the cylindrical guide tube. For this reason, even when the heat exchanger is bent, the heat exchanger can be inserted into the drilling hole in a state in which the heat exchanger is contained in the guide tube and the shape is maintained. Can be prevented. In addition, since the heat exchanger is inserted into the drilling hole while being covered with the guide tube, it is possible to prevent the heat exchanger from directly contacting the hole wall or the like and to prevent damage to the heat exchanger. it can.

  The heat exchange construction unit according to the present invention is a heat exchange construction unit used when forming the heat exchange structure, and is a guide tube and a heat exchanger that is inserted into the drilling hole while being inserted into the guide tube. And a load transmission member attached to the heat exchanger and transmitting the load of the guide tube to the heat exchanger. In the heat exchange construction unit according to the present invention, the load of the guide tube is transmitted to the heat exchanger by the load transmitting member, so that the heat exchanger is prevented from rising by the groundwater inside the drilling hole, and the desired depth is achieved. A heat exchanger can be installed.

  According to the heat exchanger construction method, the heat exchange structure, and the heat exchange construction unit according to the present invention, the workability of the heat exchanger can be improved and damage to the heat exchanger can be prevented.

It is a side view of the heat exchanger embedded by the heat exchanger construction method concerning this embodiment. It is a side cutaway view of a heat exchanger and a side view of a guide tube. It is process drawing which shows the heat exchanger construction method which concerns on 1st Embodiment. It is process drawing which shows the heat exchanger construction method following FIG. It is process drawing which shows the heat exchanger construction method following FIG. It is process drawing which shows the heat exchanger construction method following FIG. It is process drawing which shows the heat exchanger construction method following FIG. It is process drawing which shows the heat exchanger construction method following FIG. It is a schematic diagram which shows a mode that a filler is filled. It is process drawing which shows the heat exchanger construction method which concerns on 2nd Embodiment. It is process drawing which shows the heat exchanger construction method following FIG. It is a side view which shows the structure of the heat exchanger of 3rd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a side view of a heat exchanger 1 embedded by a heat exchanger construction method according to an embodiment of the present invention. As shown in FIG. 1, the heat exchanger 1 is provided in the inside of the drilling hole 2 formed in the perpendicular direction with respect to the ground. The hole 2 is filled with a filler 3, and the heat exchanger 1 exchanges heat with the ground via the filler 3. As the filler 3, earth and sand having high thermal conductivity are used, for example, silica sand.

  As shown in FIG. 2, the heat exchanger 1 is a so-called double-tube heat exchanger that has a long shape and includes an outer tube 5 and two inner tubes 7 and 8. The outer tube 5 is a cylindrical container having a hollow structure made of resin or the like, and forms the outer peripheral surface of the heat exchanger 1. The outer tube 5 has a corrugated surface and is provided with irregularities. As an example, the outer tube 5 has a length of 9340 mm, an outer diameter of 250 mm, an inner diameter of 200 mm, and is made of high-density polyethylene.

  An upper lid 9A and a bottom lid 9B for closing the opening of the outer tube 5 are provided at the upper and lower ends of the outer tube 5. The opening of the outer tube 5 is sealed by the upper lid 9A and the bottom lid 9B, thereby defining a storage portion S that holds the liquid heat medium inside. The upper lid 9 </ b> A is provided with an insertion port for inserting the inner tubes 7 and 8 into the outer tube 5. The inner pipes 7 and 8 are made of high density polyethylene, for example.

  Inner tubes 7 and 8 are accommodated inside the outer tube 5. The inner pipes 7 and 8 are pipes that are made of resin or the like and allow a heat medium to flow therethrough. One end side of the inner pipes 7 and 8 protrudes from the upper lid 9A of the outer pipe 5, and the end portions constitute the inlets 7A and 8A. The end of the inner tube 7 opposite to the injection port 7A extends to the bottom of the reservoir S. The end of the inner tube 8 opposite to the injection port 8A extends to the insertion port of the upper lid 9A that constitutes the upper surface of the storage portion S. The inner pipes 7 and 8 circulate the heat medium in the storage part S by inflowing or discharging the heat medium from the inlets 7A and 8A, and absorb heat or dissipate heat with the ground, not shown on the ground. Exchanges heat between the heat consuming equipment such as air conditioning equipment and the ground.

  A protective tube 11 having substantially the same outer diameter as the outer tube 5 is provided on the upper portion of the outer tube 5. The outer tube 5 and the protective tube 11 are detachably coupled by a joint member 13 that covers the outer periphery of the outer tube 5 and the protective tube 11 and connects the outer tube 5 and the protective tube 11. The protective tube 11 prevents the inner tubes 7 and 8 from being damaged by an external impact by covering a portion of the inner tubes 7 and 8 that protrudes from the upper cover 9A of the outer tube 5 from the outer periphery.

  A guide tube 15 used in the heat exchanger construction method according to the present embodiment is shown in FIG. As shown in FIG. 2, the guide tube 15 is a long tubular member having a cylindrical shape. The guide tube 15 functions as a member that regulates the position of the heat exchanger 1 so that the heat exchanger 1 suppresses the protrusion to the outside of the inner diameter of the guide tube 15. The inner diameter of the guide tube 15 is configured to be larger than the outer diameter of the outer tube 5. The guide tube 15 may be made of any material as long as the material has high rigidity and high weight. For example, a metal such as steel or a resin such as hard vinyl chloride can be used as the material of the guide tube 15. As an example, the outer tube 5 has a length of 12 m, an outer diameter of 400 mm, and an inner diameter of 304 mm, and is made of steel. The heat exchanger 1 is inserted into the drilling hole while being inserted into the guide tube 15.

  Next, the heat exchanger construction method according to this embodiment will be described. In the heat exchanger construction method according to the present embodiment, first, in order to embed the heat exchanger 1, the ground is excavated to form a hole (a hole forming step). An arbitrary construction method can be used for excavating the ground. For example, a casing construction method in which a hole is formed using a casing that protects a hole wall is used. As an excavator used for forming a hole, for example, a hydraulic universal large-diameter excavator manufactured by Bauer Germany can be used. Hereinafter, the hole forming process using the casing method will be described.

  First, the excavator 30 used for forming the hole is described with reference to FIG. An arm 31 extending in the vertical direction is attached to the front end portion of the excavator 30. The arm 31 is provided with a slider 32 that can be moved up and down along the extending direction of the arm 31. Further, the arm 31 is provided with a wire 33, and a rod 34 is suspended by the wire 33. The rod 34 is attached to the slider 32 so that the longitudinal direction thereof is in the vertical direction. To the lower end portion of the rod 34, the tool 17 (see FIG. 3C) and the casing 17 disposed in the drilling hole 2 are attached. The casing 17 moves in the vertical direction along with the movement along the extending direction of the arm 31 of the slider 32. The tool 35 is of a type corresponding to the soil quality.

  First, in the hole forming step, as shown in FIG. 3A, the excavator 30 is arranged at a position where the heat exchanger 1 is to be installed. Next, as shown in FIG. 3B, the excavator 30 lowers the casing 17 by the slider 32 to excavate the ground. Subsequently, as shown in FIG. 3C, the rod 34 is lowered, and the ground inside the casing 17 is excavated by the tools 35 provided at the tip of the rod 34.

  Thereafter, another casing 17 is connected to the casing 17 that has already excavated the ground, and the connected casing 17 is lowered to further excavate the ground (FIG. 4A). Subsequently, the rod 34 is lowered, and the ground inside the casing 17 is excavated by the tools 35 provided at the tip of the rod 34. When the drilling hole 2 is excavated to a desired depth by the casing 17 and the tools 35 (FIG. 4B), the rod 34 is raised by the wire 33 (FIG. 4C). The hole 2 whose hole wall is protected by the casing 17 is formed in the ground.

  As described above, when the drilling hole 2 is formed using the excavator 30, the heat exchanger 1 and the guide tube 15 are then inserted into the drilling hole 2 (insertion step). In this insertion step, the heat exchanger 1 and the guide tube 15 are inserted into the hole 2 with the heat exchanger 1 inserted into the guide tube 15. In the present embodiment, the heat exchanger 1 and the guide tube 15 constitute a heat exchange construction unit.

  In the insertion step, first, as shown in FIG. 5A, the heat exchanger 1 and the guide tube 15 are erected and suspended while the heat exchanger 1 is inserted into the guide tube 15 using a crane or the like. At this time, the wire W is connected to both the heat exchanger 1 and the guide tube 15. Further, a protective tube 11 is connected to the heat exchanger 1 by a joint member 13 (see FIG. 2). A water supply hose 19 for supplying a heat medium is connected to the inlets 7A, 8A of the inner tubes 7, 8.

  Next, as shown in FIG. 5B, in a state where the heat exchanger 1 is inserted into the guide tube 15, the heat exchanger 1 and the guide tube 15 are lowered by a crane, and the heat exchanger 1 and the guide tube 15. Is inserted into the drilling hole 2. Although ground water may exist in the hole 2, the heat exchanger 1 and the guide tube 15 are also settled to the bottom of the hole 2 due to their own weight. In this case, when the weight for sinking the heat exchanger 1 is insufficient, a heat medium may be injected into the heat exchanger 1 from the water supply hose 19.

  When the heat exchanger 1 and the guide tube 15 are inserted to a predetermined depth, the guide tube 15 is placed on the guide tube receiver 21 provided at the upper end of the casing 17 as shown in FIG. When the guide tube 15 is placed on the guide tube receiver 21, the wire W2 connected to the guide tube 15 is released from the wire W as shown in FIG. Then, the joint member 13 is removed, and the connection between the heat exchanger 1 and the protective tube 11 is released. Thereafter, the wire W1 connected to the protective tube 11 is raised by the crane, and the protective tube 11 is removed.

  When the protective tube 11 is removed, as shown in FIG. 7A, the filler 3 is put into the hole 2 (filling step). Specifically, the filler 3 is put into the space between the guide tube 15 and the casing 17 in the hole 2. Here, it is preferable that the hole 2 is not filled back to the height of the ground surface at once with the filler 3 but is filled with the filler 3 in a plurality of times. Here, the hole 2 is once filled with the filler 3 to a depth D1 lower than the ground surface. Specifically, the filler 3 is filled, for example, about 1 m.

  Thereafter, the guide tube 15 is connected to the crane again by the wire W2, and the guide tube 15 is pulled out to a depth D2 lower than the depth D1, as shown in FIG. 7B. That is, the guide tube 15 is pulled out to a position deeper than the depth in which the guide tube 15 is backfilled with the filler 3. At this time, since the filling amount of the filler 3 is small, the restraining force from the side of the guide tube 15 by the filler 3 is small. For this reason, the guide tube 15 can be pulled out with a small force.

  When pulling out the guide tube 15, it is preferable to slowly pull out the guide tube 15. When the guide tube 15 is quickly pulled out, the filler 3 falls in the vertical direction, and the filler 3 may not be sufficiently filled in the uneven portion of the outer tube 5 of the heat exchanger 1. In this regard, by slowly pulling out the guide tube 15, the filler 3 filling the space between the guide tube 15 and the casing 17 becomes a space existing between the heat exchanger 1 and the guide tube 15. The heat exchanger 1 comes into contact with the filler 3. At this time, as shown in FIG. 9, the filler 3 flows into the space between the guide tube 15 and the casing 17 from the side of the heat exchanger 1, so that the filler 3 is the outer tube of the heat exchanger 1. 5 is reliably filled in the uneven portion.

  Next, as shown in FIG. 8A, the casing 17 is pulled out to a depth D2. Here, the casing 17 does not necessarily have to be pulled out to the depth D2, which is the same height as the guide tube 15, and may be pulled out to a position deeper than the depth D1. Subsequently, the steps of FIG. 7A to FIG. 8A are repeated to insert the filler 3 into the hole 2 and to pull out the guide tube 15 and the casing 17. And as shown in FIG.8 (b), all the guide pipes 15 and the casings 17 are pulled out, and the heat exchanger 1 whole is embed | buried under the ground. Thus, the heat exchanger 1 is constructed. In this embodiment, the constructed heat exchanger 1, the drilling hole 2, and the filler 3 constitute a heat exchange structure.

  According to the heat exchanger construction method according to the first embodiment described above, the heat exchanger 1 and the guide tube 15 are in contact with the hole 2 in a state where the heat exchanger 1 is inserted into the cylindrical guide tube 15. Inserted. For this reason, even if the heat exchanger is bent one time, the straight guide tube 15 may be inserted into the hole 2 so that it does not contact the hole wall 2A, so that the hole wall 2A prevents collapse. Can do. When there is a possibility that the hole wall 2A is collapsed, it is necessary to take extra measures such as deeply excavating the hole 2 in advance and the workability is lowered. However, the heat exchanger construction method according to the present embodiment According to this, since the hole wall 2A is prevented from collapsing, the workability of the heat exchanger 1 can be improved. Further, since the collapse of the hole wall 2A can be prevented, the excavation diameter of the hole 2 can be reduced, and as a result, the excavation cost can be reduced. Furthermore, since the heat exchanger 1 is inserted into the drilling hole 2 while being covered with the guide tube 15, the heat exchanger 1 is prevented from directly contacting the hole wall 2A and the like, and the heat exchanger 1 is damaged. Can be prevented. Therefore, according to the heat exchanger construction method which concerns on this embodiment, the workability of the heat exchanger 1 can be improved and damage to the heat exchanger 1 can be prevented. Thereby, the workability and construction quality of the heat exchanger 1 can be improved.

  Moreover, in the heat exchanger construction method which concerns on the said embodiment, since the guide tube 15 is metal and the rigidity of the guide tube 15 is high, it can prevent that the heat exchanger 1 is damaged reliably.

  Moreover, in the heat exchanger construction method which concerns on the said embodiment, since the unevenness | corrugation is provided in the surface of the heat exchanger 1, the contact area of the heat exchanger 1 and the filler 3 can be increased, and a heat exchanger The heat exchange efficiency of 1 can be improved.

  Moreover, in the heat exchanger construction method according to the above embodiment, the guide tube 15 is pulled out from the drilling hole 2 while filling the filler 3, so that the guide tube 15 cannot be pulled out by the restraining force of the filler 3. Can be prevented. Furthermore, since the filler 3 flows in from the side surface of the heat exchanger 1 when the guide tube 15 is pulled out, the recess 3 of the heat exchanger 1 can be reliably filled with the filler 3, and the heat exchange efficiency is lowered. This can be prevented. Furthermore, in this heat exchanger construction method, the guide tube 15 can be reliably pulled out and removed regardless of the construction conditions, and the pulled-out guide tube 15 can be reused.

(Second Embodiment)
The heat exchanger construction method according to the second embodiment has processes almost similar to the heat exchanger construction method according to the first embodiment, and only the insertion process is different. In the following, considering the ease of understanding the explanation, the explanation will focus on the differences from the heat exchanger construction method according to the first embodiment, and the duplicate explanation will be omitted.

  In the present embodiment, when the heat exchanger 1 and the guide tube 15 are inserted into the drilling hole 2, a rope material (load transmission member) 25 that transmits the load of the guide tube 15 to the heat exchanger 1 is provided to the heat exchanger 1. In the connected state, the heat exchanger 1 and the guide tube 15 are inserted into the drilling hole 2. In the present embodiment, the heat exchanger 1, the guide tube 15, and the rope member 25 constitute a heat exchange construction unit. As shown in FIG. 10A, the rope member 25 includes a connecting portion 25A wound around the lower end portion of the heat exchanger 1, and a suspended portion 25B where both ends of the rope member 25 are suspended by a crane. It is out. The rope member 25 is provided via the lower end portion 15A of the guide tube 15 between the suspended portion 25B and the connecting portion 25A. The rope member 25 functions as a position regulating member that matches the longitudinal position of the heat exchanger 1 with the longitudinal position of the guide tube 15.

  A rope member 27 is wound around the upper end of the heat exchanger 1, and both ends of the rope member 27 are suspended by the crane together with the heat exchanger 1 and the guide tube 15. The rope member 27 functions to make the central axis of the heat exchanger 1 coincide with the central axis of the guide tube 15.

  In the heat exchanger construction method according to the present embodiment, as shown in FIG. 10 (a), the heat exchanger 1 and the guide tube 15 are lowered by a crane with the heat exchanger 1 inserted into the guide tube 15 first. Then, the heat exchanger 1 and the guide tube 15 are inserted into the hole 2. At this time, when groundwater exists in the borehole 2, the heat exchanger 1 having a small specific gravity tries to float with respect to the guide tube 15, but due to the tension generated in the rope member 25 from the suspended portion 25B. The heat exchanger 1 is prevented from floating with respect to the guide tube 15. That is, by transmitting the load of the heavy guide tube 15 to the heat exchanger 1 through the rope member 25, the guide tube 15 functions as a weight that prevents the heat exchanger 1 from floating.

  In addition, when inserting the heat exchanger 1 and the guide tube 15 with respect to the hole 2, a predetermined tension may be generated in the rope members 25 and 27. In this case, when the heat exchanger 1 is pulled from above and below by the rope members 25 and 27, the heat exchanger 1 becomes linear. Therefore, the heat exchanger 1 can be prevented from coming into contact with the inner wall of the guide tube 15, and the heat exchanger 1 can be more reliably prevented from being damaged.

  When the heat exchanger 1 and the guide tube 15 are inserted to a predetermined depth, the filler 3 is put into the hole 2 as shown in FIG. Specifically, the filler 3 is introduced into the space between the guide tube 15 and the hole wall 2 </ b> A of the hole 2 in the hole 2. Here, it is preferable that the hole 2 is not filled back to the height of the ground surface at once with the filler 3 but is filled with the filler 3 in a plurality of times. Here, the hole 2 is once filled with the filler 3 to a depth D1 lower than the ground surface.

  Thereafter, as shown in FIG. 11A, the guide tube 15 is pulled out to a depth D2 lower than the depth D1. At this time, the heat exchanger 1 is prevented from floating by the groundwater due to the binding force of the filler 3. Then, the process of FIG.10 (b) and FIG.11 (a) is repeated, the filler 3 is thrown in in the drilling hole 2, and the guide pipe | tube 15 is pulled out. And as shown in FIG.11 (b), all the guide tubes 15 are pulled out and the heat exchanger 1 whole is embed | buried in the ground. Thus, the heat exchanger 1 is constructed. At this time, the rope members 25 and 27 are buried in the drilling hole 2 together with the heat exchanger 1. Thus, the heat exchanger 1 is constructed. In this embodiment, the constructed heat exchanger 1, the drilling hole 2, the filler 3, and the rope member 25 constitute a heat exchange structure.

  Also in the heat exchanger construction method which concerns on 2nd Embodiment demonstrated above, there exists an effect similar to the heat exchanger construction method which concerns on 1st Embodiment. Moreover, in the heat exchanger construction method according to the second embodiment, in the insertion step, the heat exchanger 1 is connected with the rope member 25 that transmits the load of the guide tube 15 to the heat exchanger 1. 1 and the guide tube 15 are inserted into the hole 2. Specifically, the rope member 25 has a suspended portion 25B that is suspended by a crane, and a connecting portion 25A that is connected to the heat exchanger 1, and the rope member 25 includes a suspended portion 25B and a connecting portion 25A. It is provided via a lower end portion 15A of the guide tube 15 therebetween. For this reason, since the load of the guide tube 15 is transmitted to the heat exchanger 1, it is possible to prevent the heat exchanger 1 from floating due to the groundwater inside the drilling hole 2, and the heat exchanger 1 is set to a desired depth. Can be installed. Further, since the rope member 25 is connected to the heat exchanger 1, it does not get in the way when the guide tube 15 is pulled out.

  Further, in the conventional method, in order to prevent the heat exchanger 1 from floating, a weight is provided separately at the lower part of the heat exchanger, and the weight is embedded together with the heat exchanger. In this regard, in the heat exchanger construction method according to the present embodiment, the guide tube 15 finally removed functions as a weight, so there is no need to leave a separate weight in the ground, the construction cost and Environmental load can be reduced.

(Third embodiment)
The heat exchanger construction method according to the third embodiment has processes almost similar to the heat exchanger construction method according to the second embodiment, and transmits the load of the guide tube 15 to the heat exchanger 1. The members are different. In the following, considering the ease of understanding the description, the description will focus on the differences from the heat exchanger construction method according to the second embodiment, and a duplicate description will be omitted.

  In the heat exchanger construction method according to the present embodiment, as shown in FIG. 12, a locking member 29 is provided at the lower end portion of the heat exchanger 1 instead of the rope member 25. In the present embodiment, the heat exchanger 1, the guide tube 15, and the locking member 29 constitute a heat exchange execution unit. The locking member 29 is made of resin, metal, or the like, and is attached to the lower end of the heat exchanger 1 by any method such as adhesion or bolting. Further, the locking member 29 may be integrally formed with the outer tube 5 or the bottom cover 9B of the heat exchanger 1. On the other hand, the locking member 29 is not fixed to the guide tube 15.

  As shown in FIG. 12B, the locking member 29 has a portion that overlaps with the guide tube 15 in a plan view from below of the heat exchanger 1. When the heat exchanger 1 and the guide tube 15 are inserted into the drilling hole 2 with the heat exchanger 1 inserted into the guide tube 15, the locking member 29 contacts the locking member 29. In contact therewith, the load of the guide tube 15 is transmitted to the heat exchanger 1. For this reason, it is prevented that the heat exchanger 1 floats with respect to the guide pipe 15 by groundwater. That is, by transmitting the load of the heavy guide tube 15 to the heat exchanger 1 through the locking member 29, the guide tube 15 functions as a weight that prevents the heat exchanger 1 from floating. The locking member 29 is buried in the hole 2 together with the heat exchanger 1.

  Further, as shown in FIG. 12A, a protrusion 29 </ b> A extending along the outer surface of the heat exchanger 1 is provided on the upper surface (the surface on the side in contact with the heat exchanger 1) of the locking member 29. May be. The protrusion 29A has a function of restricting the horizontal movement of the heat exchanger 1 inserted into the guide tube 15 and maintaining the distance between the outer peripheral surface of the heat exchanger 1 and the inner wall of the guide tube 15 at a predetermined distance. Have. The thickness of the protrusion 29 </ b> A is formed thinner than the difference between the radius of the guide tube 15 and the radius of the heat exchanger 1. In the present embodiment, the constructed heat exchanger 1, the drilling hole 2, the filler 3, and the locking member 29 constitute a heat exchange structure.

  Also in the heat exchanger construction method which concerns on 3rd Embodiment demonstrated above, there exists an effect similar to the heat exchanger construction method which concerns on 1st Embodiment. In the heat exchanger construction method according to the third embodiment, the load on the guide tube 15 is transmitted to the heat exchanger 1 through the locking member 29 by the guide tube 15 coming into contact with the locking member 29. Therefore, it is possible to prevent the heat exchanger 1 from floating due to the groundwater inside the drilling hole 2, and the heat exchanger 1 can be installed at a desired depth. Further, since the locking member 29 is not fixed to the guide tube 15, it does not get in the way when the guide tube 15 is pulled out.

  Further, in the conventional method, in order to prevent the heat exchanger 1 from floating, a weight is provided separately at the lower part of the heat exchanger, and the weight is embedded together with the heat exchanger. In this regard, in the heat exchanger construction method according to the present embodiment, the guide tube 15 finally removed functions as a weight, so there is no need to leave a separate weight in the ground, the construction cost and Environmental load can be reduced. In addition, since the heat exchanger 1 is prevented from coming into contact with the inner wall of the guide tube 15 by the protrusion 29A, it is possible to more reliably prevent the heat exchanger 1 from being damaged.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  For example, in the first to third embodiments, a so-called double pipe heat exchanger including the outer pipe 5 and the two inner pipes 7 and 8 as the heat exchanger 1 has been described. Instead of the exchanger, a so-called helical type heat exchanger in which a U-shaped heat collecting pipe is attached to a helical rebar may be used.

  In the first embodiment, the ground hole is formed using the casing method, but the hole may be formed using other methods. For example, the drilling hole 2 may be formed by using a kneading method in which the drilling soil 2 is formed while kneading excavated soil to the hole wall 2A. In this case, since it is not necessary to install the casing 17, workability can be improved.

  Further, in the first to third embodiments, the filler 3 is charged in a plurality of times, and the guide tube 15 and the casing 17 are pulled out after each time the filler is charged. And the number of times of pulling out the guide tube 15 and the casing 17 can be changed. Moreover, the charging operation of the filler 3 and the extraction operation of the guide tube 15 and the casing 17 may be performed simultaneously.

  Moreover, you may change arbitrarily the construction procedure of the heat exchanger 1 if it is a range which does not deviate from description of a claim. For example, in the first embodiment, the wire W1 is connected to the protective tube 11 and the heat exchanger 1 is suspended, but the wire W1 is wound around and fixed to the outer tube 5 of the heat exchanger 1 to fix the heat exchanger 1. May be suspended. In this case, the protective tube 11 is not removed but embedded in the hole 2 together with the wire W1.

The present invention described above relates to the following matters.
[1]
Drilling process for excavating the ground to form a hole;
An insertion step of inserting the heat exchanger and the guide tube into the drilling hole in a state where a resin heat exchanger for circulating a heat medium therein is inserted into a cylindrical guide tube,
After the insertion step, a filling step of filling the space in the drilling hole with a filler,
Including heat exchanger construction method.
[2]
In the inserting step, the heat exchanger and the guide tube are inserted into the drilling hole in a state where a load transmission member for transmitting the load of the guide tube to the heat exchanger is connected to the heat exchanger. The heat exchanger construction method according to [1] above.
[3]
The load transmission member is a rope member having a suspended portion suspended by a suspension device and a connecting portion connected to the heat exchanger, and the rope material is between the suspended portion and the connecting portion. The heat exchanger construction method according to the above [2], which is provided via the lower end of the guide tube.
[4]
The heat exchanger and the guide tube are elongated,
The load transmission member is a locking member having a portion overlapping the guide tube in a plan view from the longitudinal direction of the heat exchanger and the guide tube, and the locking member is a lower end portion of the heat exchanger. The heat exchanger construction method according to the above [2], which is provided in the above.
[5]
The upper surface of the locking member is provided with a protrusion that extends along the outer surface of the heat exchanger and maintains a predetermined distance between the outer surface of the heat exchanger and the inner wall of the guide tube. [4] The heat exchanger construction method according to [4].
[6]
The heat exchanger construction method according to any one of [1] to [5], wherein the guide tube is made of metal.
[7]
The heat exchanger construction method according to any one of [1] to [6], wherein unevenness is provided on a surface of the heat exchanger.
[8]
The heat exchanger construction method according to any one of the above [1] to [7], wherein, in the filling step, the guide tube is pulled out from the hole while filling the filler.
[9]
Drilling holes formed in the ground,
A heat exchanger that is inserted into the drilling hole in a state of being inserted into the cylindrical guide tube,
A filler for exchanging heat between the heat exchanger and the ground;
A heat exchange structure comprising:
[10]
The heat exchanging structure according to [9], wherein the guide tube is formed by being pulled out from the hole after the heat exchanger is installed in the hole.
[11]
Comprising a load transfer member attached to the heat exchanger;
[9] The above-mentioned [9], wherein when the heat exchanger is inserted into the drilling hole in a state of being inserted into the guide tube, the load of the guide tube is transmitted to the heat exchanger by the load transmitting member. ] Or the heat exchange structure according to [10].
[12]
A heat exchange construction unit used when forming the heat exchange structure according to the above [9] or [10],
The guide tube;
A heat exchanger inserted into the drilling hole in a state of being inserted into the guide tube;
Heat exchange construction unit with
[13]
A heat exchange construction unit used when forming the heat exchange structure according to [11] above,
The guide tube;
A heat exchanger inserted into the drilling hole in a state of being inserted into the guide tube;
A load transmitting member attached to the heat exchanger and transmitting a load of the guide tube to the heat exchanger;
Heat exchange construction unit with

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger 2 ... Drilling hole 2A ... Hole wall 3 ... Filler 15 ... Guide pipe 25 ... Rope material 25A ... Connection part 25B ... Suspension part 29 ... Locking member

Claims (6)

Drilling process for excavating the ground to form a hole;
An insertion step of inserting the heat exchanger and the guide tube into the drilling hole in a state where a resin heat exchanger for circulating a heat medium therein is inserted into a cylindrical guide tube,
After the insertion step, a filling step of filling the space in the drilling hole with a filler,
Including heat exchanger construction method.   The heat exchanger construction method according to claim 1, wherein, in the filling step, the guide tube is removed from the hole.   In the inserting step, the heat exchanger and the guide tube are inserted into the drilling hole in a state where a load transmission member for transmitting the load of the guide tube to the heat exchanger is connected to the heat exchanger. The heat exchanger construction method according to claim 1 or 2.   The heat exchanger construction method according to any one of claims 1 to 3, wherein the guide tube is made of metal.   The heat exchanger construction method as described in any one of Claims 1-4 with which the unevenness | corrugation is provided in the surface of the said heat exchanger.   The heat exchanger construction method according to any one of claims 1 to 5, wherein in the filling step, the guide tube is pulled out from the hole while filling the filler.

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