JP5912924B2 - Basic insulation structure - Google Patents

Description

  The present invention relates to a basic heat insulating structure capable of reducing the temperature change of an underfloor space by effectively using underground heat while reducing the construction cost.

  Conventionally, there has been proposed a foundation heat insulating structure in which a heat insulating material is attached to a rising portion of a foundation protruding from the ground surface. Such a structure can enhance the heat insulation of the underfloor space that exchanges heat with the ground. Accordingly, the underfloor space can store underfloor air that is cooler than the outside air in summer and warmer than the outside air in winter. The air stored in such an underfloor space is supplied to a living room, for example, and used as ventilation or initial heating. Related technologies include the following.

JP 2005-42958 A

  As described above, in order to use the air in the underfloor space for the living room, it is desired to make the temperature change smaller. For this purpose, it is important to efficiently take underground heat into the underfloor space and to reliably insulate the foundation. On the other hand, the heat insulating material provided on the foundation needs to be used efficiently in order to suppress an increase in cost.

  The present invention has been devised in view of the actual situation as described above. The underfloor space is an underground structure, and the average heat resistance of the first heat insulating portion disposed below the ground surface is defined as the first heat insulating portion. It is based on making it smaller than the average heat resistance of the 2nd heat insulation part distribute | arranged on the basis, providing the basic heat insulation structure which can make the temperature change of underfloor space small, suppressing the increase in cost. The main purpose.

  The invention according to claim 1 of the present invention is a basic heat insulating structure that insulates the foundation of a building, and the foundation includes a rising portion that protrudes from the ground surface and surrounds the underfloor space. The bottom structure is an underground structure located below the ground surface, the rising portion is provided with a heat insulating material, and the heat insulating material is a first heat insulating portion disposed below the ground surface, A second heat insulating part disposed on the first heat insulating part, wherein the average heat resistance of the first heat insulating part is smaller than the average heat resistance of the second heat insulating part.

  The invention according to claim 2 is the basic heat insulating structure according to claim 1, wherein at least a part of the first heat insulating portion has a thermal resistance that decreases downward.

  The invention according to claim 3 is the basic heat insulating structure according to claim 1, wherein the thermal resistance of the first heat insulating portion is constant in the vertical direction.

  Moreover, invention of Claim 4 is a basic heat insulation structure in any one of Claims 1 thru | or 3 with which the average thickness of a said 1st heat insulation part is smaller than the average thickness of a said 2nd heat insulation part.

  The invention according to claim 5 is the basic heat insulating structure according to claim 4, wherein the thickness of at least part of the first heat insulating portion gradually decreases downward.

  The invention according to claim 6 is the basic heat insulating structure according to claim 4, wherein the thickness of the first heat insulating portion is constant.

  The invention according to claim 7 is the basic heat insulating structure according to any one of claims 4 to 6, wherein the first heat insulating portion and the second heat insulating portion are made of heat insulating materials having the same thermal conductivity.

  In the invention according to claim 8, the thickness of the first heat insulation part and the thickness of the second heat insulation part are the same, and the first heat insulation part and the second heat insulation part have thermal conductivity. It is a basic heat insulation structure in any one of Claim 1 thru | or 3 which consists of a different heat insulating material.

  The invention according to claim 9 is characterized in that the foundation is a cloth foundation, and the underfloor space is laid with soil concrete that constitutes the bottom surface, and the first heat insulating portion includes the soil concrete and the rising portion. A lower side portion disposed below the bottom surface, an upper portion disposed on the second heat insulating portion side, and an intermediate portion detachably disposed between the lower side portion and the upper portion. It is the basic heat insulation structure in any one of Claims 1 thru | or 8 containing these.

  The invention according to claim 10 is the basic heat insulating structure according to claim 9, wherein a contact surface between the upper portion and the intermediate portion is inclined upward from the outdoor side toward the underfloor space side. .

  The invention according to claim 11 is the basic heat insulation according to any one of claims 1 to 8, wherein the foundation is a solid foundation in which the rising portion and a bottom plate constituting the bottom surface of the underfloor space are integrated. It is a structure.

  In the basic heat insulating structure of the present invention, a heat insulating material is attached to the rising portion of the foundation surrounding the underfloor space. Such a heat insulating material can insulate the underfloor space from the outside air and reduce the temperature change of the underfloor space.

  The underfloor space is formed as an underground structure whose bottom surface is located below the ground surface. As a result, the air in the underfloor space is heat-exchanged with underground heat in the vicinity of the non-prone layer where the temperature is substantially constant (for example, about ± 0.1 ° C.) throughout the year. For this reason, the temperature change of underfloor space is made smaller.

  Thus, the basic heat insulation structure of the present invention can make the temperature change in the underfloor space smaller. The air in the underfloor space where the temperature is stable can be effectively reduced, for example, by supplying the air to a living room, thereby reducing the load on an air conditioner such as an air conditioner. Therefore, the basic heat insulating structure of the present invention can effectively utilize the thermal energy of the underfloor space.

  Furthermore, in this invention, the said heat insulating material contains the 1st heat insulation part distribute | arranged below the ground surface, and the 2nd heat insulation part distribute | arranged on this 1st heat insulation part. And the average heat resistance of a 1st heat insulation part is set smaller than the average heat resistance of a 2nd heat insulation part.

  Since the rising portion where the first heat insulating portion is disposed is buried below the ground surface, that is, buried in the ground, it is difficult to be affected by outside air. Moreover, underground heat is transmitted to the rising part where the first heat insulating part is disposed. For this reason, the heat insulation performance calculated | required by the 1st heat insulation part is small compared with the 2nd heat insulation part exposed to external air. Therefore, even if the average heat resistance of the first heat insulating part is set smaller than the average heat resistance of the second heat insulating part as in the present invention, the heat insulating performance of the underfloor space can be maintained.

  Moreover, in the basic heat insulation structure of this invention, the cost of this part can be suppressed rather than a 2nd heat insulation part by making the average heat resistance of a heat insulating material small in a 1st heat insulation part. Therefore, in the present invention, an increase in cost can be suppressed.

It is sectional drawing which shows the basic heat insulation structure of embodiment of this invention. It is the elements on larger scale of FIG. (A) is sectional drawing of the 1st heat insulation part of other embodiment of this invention, (b) is sectional drawing explaining the state which removed the intermediate part of (a). It is sectional drawing which shows the basic heat insulation structure of other embodiment of this invention. It is sectional drawing which shows the basic heat insulation structure of other embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a partial cross-sectional view near the foundation of a building B such as a house. As shown in FIG. 1, the present invention relates to a foundation insulation structure that insulates a foundation 2 of a building B.

  The building B has a foundation 2 that supports a base, an outer wall, and the like, a floor material 3 on the first floor supported above the foundation 2, and an underfloor space 5 that is partitioned by the foundation 2 and the floor material 3.

  The foundation 2 is continuously arranged on the outer periphery of the building B. The foundation 2 of the present embodiment is made of reinforced concrete, and includes a base portion 2A extending horizontally in the underground G and a rising portion 2B extending upward from a substantially center in the width direction of the base portion 2A. That is, in this embodiment, the foundation 2 is shown as a fabric foundation having a T-shaped cross section.

  The rising portion 2B protrudes at a small height from the ground surface GL, which is a ground line serving as a reference for the vertical height of the building B, and is disposed so as to surround the underfloor space 5. A base 6 is fixed to the upper surface side of the rising portion 2B. An outer wall 7 is fixed to the base 6.

  Below the underfloor space 5, for example, ground crushed stone 9, an ant-proof moisture-proof sheet 10, and dirt concrete 11 are laid. The upper surface of the soil concrete 11 constitutes the bottom surface 8 of the underfloor space 5.

  The ant-proof moisture-proof sheet 10 includes, for example, a main body portion 10A disposed substantially horizontally so as to cover the crushed stone 9, an inclined portion 10B extending from the main body portion 10A toward the base portion 2A side of the foundation 2, and the inclined portion 10B. And an edge portion 10C extending substantially horizontally to the outdoor side So along the upper surface of the base portion 2A.

  The inclined portion 10B is inclined downward from the underfloor space 5 side toward the outdoor side So. Moreover, the edge part of the outdoor side So of the edge part 10C is contact | abutting to the side surface by the side of the underfloor space 5 of the heat insulating material 20 mentioned later. Since such an ant-proof moisture-proof sheet 10 is arranged over the entire area below the soil concrete 11 and the heat insulating material 20, entry of ants and moisture into the underfloor space 5 can be effectively prevented.

  Furthermore, the underfloor space 5 is provided with, for example, a plurality of bundles 15 protruding upward from the bottom surface 8 and a large pull 16 supported by the bundle 15. The flooring 3 is supported by the bundle 15 and the large pull 16.

  The bottom surface 8 of the underfloor space 5 of the present embodiment is substantially not entirely covered with a heat insulating material. Thereby, the air in the underfloor space 5 is heat-exchanged with the heat of the underground G with little temperature change throughout the year through the soil concrete 11. In other words, the soil concrete 11 constitutes the heat exchange unit 17. Since such an underfloor space 5 can effectively reduce a temperature change, it can cool air in summer and warm air in winter stably. In addition, in the range which does not prevent the said heat exchange, it does not interfere that a part of bottom face 8 is covered with a heat insulating material.

  The air in the underfloor space 5 is supplied to the living room by a blowing means (not shown), for example. Thereby, the load of air-conditioning equipment, such as an air conditioner of a living room, is reduced effectively. Therefore, the basic heat insulating structure of the present embodiment is useful for effectively utilizing the thermal energy of the underfloor space 5. In addition, the rising part 2B etc. of the foundation 2 is provided with a ventilating opening having an opening area set to such an extent that the temperature change of the underfloor space 5 is minimized. Thereby, outside air is introduced into the underfloor space 5.

  The underfloor space 5 has an underground structure whose bottom surface 8 is located below the ground surface GL. In the underground G, there is a non-prone layer (not shown) in which the temperature becomes substantially constant (about ± 0.1 ° C.) throughout the year. The position of this incompetent layer is influenced by the outside air and the heat insulation structure of the building, but is deeper than the ground surface. Therefore, when the underfloor space 5 has an underground structure, the heat exchange unit 17 approaches the non-prone layer. Thereby, the heat exchange part 17 of the underfloor space 5 can obtain underground heat efficiently, and can suppress the temperature change of the underfloor space 5 further smaller.

  In order to effectively exhibit such an action, the depth D between the ground surface GL and the bottom surface 8 is preferably 200 to 500 mm. When the depth D is less than 200 mm, the heat exchanging part 17 cannot sufficiently approach the non-facilitated layer, and the merit of the underground structure may not be obtained. Conversely, when the depth D exceeds 500 mm, when constructing the basic heat insulating structure of the present embodiment, it is necessary to excavate deeper into the ground, which may increase the cost.

  Furthermore, the heat insulating material 20 is attached to the rising portion 2B of the foundation 2 in the basic heat insulating structure of the present embodiment. The heat insulating material 20 includes, for example, a vertical portion 20A extending up and down along the rising portion 2B, and an upper portion 20B extending horizontally along the upper surface of the rising portion 2B. The heat insulating material 20 is formed in a substantially L-shaped cross section by the vertical portion 20A and the upper portion 20B. As the heat insulating material 20, for example, a plate-shaped heat insulating material such as polystyrene foam, urethane foam, or phenol foam having excellent heat resistance and impact resistance is suitably employed.

  As shown in an enlarged view in FIG. 2, the vertical portion 20 </ b> A of the heat insulating material 20 includes a first heat insulating portion 23 disposed below the ground surface GL and a first heat insulating portion 23 disposed above the first heat insulating portion 23. 2 heat insulation part 24. These first heat insulation portion 23 and second heat insulation portion 24 are continuously arranged with no gap in the cross-sectional shape of FIG. 2 on the side surface of the rising portion 2B on the underfloor space 5 side.

  Such a heat insulating material 20 can block the heat of the outside air transmitted through the foundation 2 in the underfloor space 5. Therefore, the heat insulating material 20 can make the temperature change of the underfloor space 5 small. Moreover, when the temperature change of the underfloor space 5 is reduced by the heat insulating material 20, the boundary of the non-problem layer below the underfloor space 5 is further raised toward the underfloor space 5. Therefore, the basic heat insulating structure of the present embodiment provides a synergistic effect of further bringing the underfloor space 5 closer to the non-prone layer and further reducing the temperature change of the underfloor space 5.

  Moreover, since the rising part 2B in which the 1st heat insulation part 23 is arrange | positioned is embed | buried under the underground G, it is hard to receive the influence of external air. Furthermore, underground heat is transmitted to the rising portion 2B where the first heat insulating portion 23 is disposed. For this reason, the heat insulation performance calculated | required by the 1st heat insulation part 23 is small compared with the 2nd heat insulation part 24 distribute | arranged above the ground surface GL.

  Therefore, in the present invention, the average heat resistance of the first heat insulating portion 23 is set to be smaller than the average heat resistance of the second heat insulating portion 24. Thus, even if the average heat resistance of the first heat insulating portion 23 is set to be relatively small, as described above, the heat insulating performance required for the first heat insulating portion 23 is relatively small. Insulation performance is maintained.

  Moreover, the construction cost of a heat insulating material is generally proportional to its thermal resistance. Therefore, even if the average thermal resistance of the first heat insulating portion 23 is set to be relatively small, even if the underfloor space 5 has an underground structure and the arrangement area of the heat insulating material 20 increases, the increase in cost can be suppressed. it can.

  Here, as shown in FIG. 2, the average thermal resistance of the first heat insulating portion 23 is between the surface on the outside air side and the surface on the underfloor space side in the range from the upper end 23 u to the lower end 23 d of the first heat insulating portion 23. It is the average value of the thermal resistance between. Further, the average thermal resistance of the second heat insulating portion 24 is an average value of the thermal resistance between the surface on the outside air side and the surface on the underfloor space side in the range from the upper end 24u to the lower end 24d of the second heat insulating portion 24. .

In order to effectively exhibit the above action, the average heat resistance of the first heat insulating portion 23 is desirably 0.2 to 1.4 m ² K / W. Similarly, the average heat resistance of the second heat insulating portion 24 is desirably 1.4 to 2.1 m ² K / W.

  The average heat resistance of the first heat insulating part 23 is preferably 50 to 70% of the average heat resistance of the second heat insulating part 24. When the average heat resistance of the first heat insulating portion 23 exceeds 70% of the average heat resistance of the second heat insulating portion 24, the cost of the heat insulating material 20 may not be sufficiently reduced. On the contrary, when the average heat resistance of the first heat insulation part 23 is less than 50% of the average heat resistance of the second heat insulation part 24, the average heat resistance of the first heat insulation part 23 becomes small, and the heat insulation of the underfloor space 5 is increased. There is a risk that it cannot be maintained sufficiently.

  In this embodiment, in order to set the average heat resistance of the first heat insulating portion 23 to be smaller than the average heat resistance of the second heat insulating portion 24, the average thickness A1 of the first heat insulating portion 23 is set to the second heat insulating portion 24. Is set smaller than the average thickness A2. At this time, the first heat insulating part 23 and the second heat insulating part 24 are made of a heat insulating material having the same thermal conductivity (aspect 1), or the first heat insulating part 23 has heat larger than that of the second heat insulating part 24. A heat insulating material having conductivity is used (Aspect 2). In view of the manufacturing cost, the mode 1 is preferable. Moreover, in order to exhibit the effect | action of this invention more effectively, 50-70% of the average thickness A1 of the 1st heat insulation part 23 of the average thickness A2 of the 2nd heat insulation part 24 is desirable.

  Here, the average thickness A1 of the first heat insulating portion 23 is an average value of the thickness T1 in the range from the upper end 23u to the lower end 23d of the first heat insulating portion 23. Further, the average thickness A2 of the second heat insulating portion 24 is an average value of the thickness T2 in the range from the upper end 24u to the lower end 24d of the second heat insulating portion 24.

  Further, the temperature of the underground G tends to decrease as the temperature increases from the ground surface GL. For this reason, the heat insulation performance calculated | required by the 1st heat insulation part 23 becomes small toward the bottom from the ground surface GL. Therefore, it is desirable that the thermal resistance of the first heat insulating portion 23 decreases downward in at least a part (preferably, the entire range from the upper end 23u to the lower end 23d as in the present embodiment). In the present embodiment, the thickness T1 of the first heat insulating portion 23 is gradually reduced downward, so that the thermal resistance is also reduced downward. In addition, the thermal resistance of the 1st heat insulation part 23 can also be changed in steps toward the downward direction.

Such a first heat insulating portion 23 has characteristics according to the heat insulating performance required for the first heat insulating portion 23, and thus efficiently maintains the heat insulating property of the underfloor space 5 while reducing the cost of the heat insulating material 20. be able to. In particular, the thickness T1 at the upper end 23u of the first heat insulating portion 23 is preferably about 40 to 60 mm. Further, the thermal resistance at the upper end 23u of the first heat insulating portion 23 is preferably about 1.4 to 2.1 m ² K / W, for example. Similarly, the thickness T1 at the lower end 23d of the first heat insulating portion 23 is desirably about 5 to 20 mm. Further, the thermal resistance at the lower end 23d of the first heat insulating portion 23 is preferably 0.2 to 0.7 m ² K / W.

  In this embodiment, the lower end 23 d of the first heat insulating portion 23 extends downward between the soil concrete 11 and the rising portion 2 b and is in contact with the base portion 2 A of the foundation 2. Since the lower end 23d of the first heat insulating portion 23 is arranged further below the bottom surface 8 of the underfloor space 5, it is possible to effectively prevent a decrease in the heat insulating property of the underfloor space 5.

  The second heat insulating part 24 has a constant thermal resistance, for example, in a range from the upper end 24u to the lower end 24d that coincides with the ground surface GL. In the present embodiment, the second heat insulating portion 24 is formed of one kind of heat insulating material and its thickness T2 is constant, so that its thermal resistance is constant in the vertical direction. Such a second heat insulating portion 24 can uniformly block the heat of the outside air transmitted through the foundation 2 in the entire range from the upper end 24u to the lower end 24d. As thickness T2 of such 2nd heat insulation part 24, about 40-60 mm is desirable, for example.

  The upper portion 20B of the heat insulating material 20 is formed in a plate shape having a rectangular cross section extending from the underfloor space 5 side to the outdoor side So along the upper surface of the rising portion 2B. Further, the end portion of the outdoor side So of the upper portion 20 </ b> B is in contact with the base 6. Such an upper part 20 </ b> B can suppress heat exchange between the outside air and the air in the underfloor space 5 between the rising part 2 </ b> B and the outer wall 7.

3 (a) and 3 (b) show a basic heat insulating structure according to another embodiment of the present invention.
As shown in FIG. 3A, the first heat insulating portion 23 of this embodiment is configured to be disassembled and assembled. That is, the first heat insulating portion 23 of this embodiment is configured based on the cross-sectional shape of FIG. 1, but is arranged on the lower side portion 26 arranged on the bottom surface 8 side of the underfloor space 5 and the second heat insulating portion 24 side. The upper part 27 and the intermediate part 28 arranged between the lower part 26 and the upper part 27 are configured to be disassembled.

  The lower side portion 26 extends, for example, below the bottom surface 8 of the underfloor space 5 between the soil concrete 11 and the rising portion 2B. The lower side portion 26 is fixed to the base 2, for example. The upper portion 27 is also fixed to the rising portion 2B. Note that the upper end 27 u of the upper part 27 is in contact with the lower end 24 d of the second heat insulating part 24.

  The intermediate part 28 is press-fitted between the lower part 26 and the upper part 27. A contact surface 30 (shown in FIG. 3A) between the upper portion 27 and the intermediate portion 28 is formed in the vicinity of the central portion 31 between the ground surface GL and the bottom surface 8.

  Such an intermediate portion 28 is detachably disposed on the rising portion 2B as shown in FIG. That is, the intermediate portion 28 can be removed from between the lower portion 26 and the upper portion 27 by elastically deforming itself. After the intermediate portion 28 is removed, for example, an ant-proofing agent can be sprayed in the corner 32 between the rising portion 2B and the soil concrete 11 and in the vicinity of the central portion 31. Therefore, the 1st heat insulation part 23 of this embodiment is useful for improving the maintainability of the underfloor space 5. FIG.

  Further, the intermediate portion 28 of the present embodiment has a thickness that decreases downward. For this reason, the lower side of the intermediate portion 28 can be easily deformed. Therefore, even when the intermediate portion 28 is firmly press-fitted between the lower side portion 26 and the upper side portion 27, the intermediate portion 28 can be removed without causing damage or the like by bending and deforming the lower side portion as a fulcrum. Remounting is very easy. Therefore, in the structure of this embodiment, the above-described maintainability is further improved.

  Further, as shown in FIG. 3A, the contact surface 30 between the upper portion 27 and the intermediate portion 28 of the first heat insulating portion 23 is inclined upward from the outdoor side So toward the underfloor space 5 side. Is desirable. Thereby, when removing the intermediate part 28, the operator can pull out the intermediate part 28 upward along the inclination of the contact surface 30, and the maintenance performance can be further improved. In addition, when the intermediate portion 28 is attached, the intermediate portion 28 can be fitted downward while flexibly deforming the lower side toward the rising portion 2B. Therefore, the operator can easily attach and remove the intermediate portion 28 in the narrow underfloor space 5.

  As shown in FIGS. 3A and 3B, in this embodiment, the contact surface 33 between the lower side portion 26 and the intermediate portion 28 is formed below the bottom surface 8. Thereby, the recessed part 36 dented toward the upper end 26u of the lower side part 26 from the bottom face 8 is provided between the soil concrete 11 and the standing part 2B. Such a recess 36 prevents the intermediate portion 28 from coming off when the lower end 28d of the intermediate portion 28 is inserted.

In the embodiment of FIG. 2 and FIG. 3A, the heat resistance of the first heat insulating portion 23 is exemplified as decreasing downward, but is not limited thereto. For example, the thermal resistance of the first heat insulating portion 23 may be constant in the vertical direction. That is, in the embodiment shown in FIG. 4, the thickness T <b> 1 of the first heat insulating portion 23 is constant, so that the thermal resistance is constant in the vertical direction. The thickness T1 (<T2) of the first heat insulating portion 23 of this embodiment is preferably about 20 to 40 mm, and the thermal resistance is preferably 0.7 to 1.4 m ² K / W.

  In each said embodiment, the average thickness A1 of the 1st heat insulation part 23 is set smaller than the average thickness A2 of the 2nd heat insulation part 24, Therefore The average thermal resistance of the 1st heat insulation part 23 is 2nd. What was made smaller than the average heat resistance of the heat insulation part 24 was shown. However, the present invention is not limited to such an embodiment. For example, as shown in FIG. 5, a material having a higher thermal conductivity than the heat insulating material forming the second heat insulating portion 24 may be adopted as the heat insulating material forming the first heat insulating portion 23. That is, the 1st heat insulation part 23 and the 2nd heat insulation part 24 may be comprised with a different material. In such an embodiment, for example, the thickness T1 of the first heat insulating portion 23 and the thickness T2 of the second heat insulating portion 24 can be made the same, and the work of attaching the heat insulating material to the rising portion 2B becomes easy. The workability is improved. Note that the thickness T1 of the first heat insulating portion 23 and the thickness T2 of the second heat insulating portion 24 may be different.

  Furthermore, in the said embodiment, although the fabric foundation was shown as the foundation 2, this invention is not necessarily limited to such a form. For example, as shown in FIG. 5, a so-called solid foundation 40 in which the rising portion 2 </ b> B and the bottom plate 2 </ b> C constituting the entire bottom surface 8 of the underfloor space 5 are integrated may be used as the foundation 2. Such a solid foundation 40, for example, does not require or reduces the spraying of the termite-proofing agent or the like, so the intermediate part 28 for spraying the termite-proofing agent shown in FIGS. The structure of the 1 heat insulation part 23 is simplified.

  In each of the above embodiments, the thermal resistance, thickness, and the like of each heat insulating portion are described as values suitable for a relatively warm general area. Therefore, when the present invention is implemented in a cold region, it is desirable that each value such as thermal resistance and thickness of each heat insulating portion is about 1.5 to 2.0 times the above values.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to illustrated embodiment at all, It can deform | transform and implement in a various aspect. For example, although the heat insulating material 20 is attached to the inner surface facing the underfloor space 5 side of the rising portion 2B of the foundation 2, it may be attached to the outer surface. Moreover, although the 1st heat insulation part 23 and the 2nd heat insulation part 24 were respectively what was comprised with the uniform material, in each of the heat insulation parts 23 and 24, several thermal conductivity differs. Materials may be used. Furthermore, the 1st heat insulation part 23 and the 2nd heat insulation part 24 may be integrated or separate.

2 foundation 2B rising part 5 under floor space 8 bottom face 20 heat insulating material 23 first heat insulating part 24 second heat insulating part GL ground surface

Claims (11)

A foundation insulation structure that insulates the foundation of a building,
The foundation includes a rising portion that protrudes from the ground surface and surrounds the space under the floor,
The underfloor space is an underground structure whose bottom surface is located below the ground surface,
A heat insulating material is attached to the rising portion,
The heat insulating material includes a first heat insulating portion disposed below the ground surface, and a second heat insulating portion disposed on the first heat insulating portion,
The basic heat insulating structure, wherein an average heat resistance of the first heat insulating portion is smaller than an average heat resistance of the second heat insulating portion.   The basic heat insulating structure according to claim 1, wherein at least a part of the first heat insulating portion has a thermal resistance that decreases downward.   The basic heat insulating structure according to claim 1, wherein a thermal resistance of the first heat insulating portion is constant in a vertical direction.   The basic heat insulating structure according to any one of claims 1 to 3, wherein an average thickness of the first heat insulating portion is smaller than an average thickness of the second heat insulating portion.   The basic heat insulating structure according to claim 4, wherein the thickness of at least a part of the first heat insulating portion gradually decreases downward.   The basic heat insulating structure according to claim 4, wherein a thickness of the first heat insulating portion is constant.   The basic heat insulating structure according to any one of claims 4 to 6, wherein the first heat insulating portion and the second heat insulating portion are made of a heat insulating material having the same thermal conductivity. The thickness of the first heat insulating part and the thickness of the second heat insulating part are the same,
The basic heat insulating structure according to any one of claims 1 to 3, wherein the first heat insulating part and the second heat insulating part are made of heat insulating materials having different thermal conductivities. The foundation is a fabric foundation;
In the underfloor space, soil concrete constituting the bottom surface is laid,
The first heat insulating portion includes a lower side portion disposed below the bottom surface, an upper portion disposed on the second heat insulating portion side, and the lower side portion between the soil concrete and the rising portion. The basic heat insulating structure according to any one of claims 1 to 8, further comprising an intermediate portion detachably disposed between the upper portion and the upper portion.   The basic heat insulating structure according to claim 9, wherein a contact surface between the upper part and the intermediate part is inclined upward from the outdoor side toward the underfloor space side.   The foundation heat insulating structure according to any one of claims 1 to 8, wherein the foundation is a solid foundation in which the rising portion and a bottom plate constituting the bottom surface of the underfloor space are integrated.

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