JP6889077B2 - Insulation foundation structure and its construction method - Google Patents

Description

The present invention relates to a heat insulating foundation structure and a construction method thereof, and more particularly to a heat insulating foundation structure in which a heat insulating material is attached to the foundation and a technique effective by applying to the construction method of the heat insulating foundation structure.

The following Patent Document 1 discloses a basic heat insulating structure. In this foundation heat insulating structure, a heat insulating material is added to the underfloor space side at the rising portion of the foundation of the building. The heat insulating material includes a first heat insulating portion arranged below the ground surface and a second heat insulating portion arranged above the ground surface on the first heat insulating portion. The average thermal resistance of the first heat insulating portion is set to be smaller than the average thermal resistance of the second heat insulating portion.
Then, in the underfloor space, soil concrete is placed on the ground surface. The end face of this soil concrete is configured to be in contact with the lower end of the first heat insulating portion.

Japanese Patent No. 5912924

In the above-mentioned heat insulating foundation structure, no consideration is given to the workability of the work of adding the heat insulating material to the foundation and the work of filling the soil concrete.

In consideration of the above facts, the present invention provides a basic heat insulating structure capable of improving workability and a method for constructing the basic heat insulating structure.

The heat-insulating foundation structure according to the first embodiment of the present invention has a base portion embedded in the ground and a rising portion standing on the base portion and protruding from the ground surface, and surrounds the ground surface to form an underfloor space. A heat insulating material with a thin wall that is attached to the side surface of the rising part on the underfloor space side and the thickness of the lower end gradually decreases toward the rising part toward the base part, and hitting on the ground surface in the underfloor space. It is provided with a moisture-proof concrete that is provided, is in close contact with the thin-walled portion, and has a thickness that matches the starting position of the gradual decrease in the thickness of the thin-walled portion.

The heat insulating foundation structure according to the first embodiment includes a foundation, a heat insulating material, and moisture-proof concrete. The foundation has a base portion buried in the ground and a rising portion standing on the base portion and protruding from the ground surface, and surrounds the ground surface to form an underfloor space. The heat insulating material is attached to the side surface of the rising portion on the underfloor space side. Moisture-proof concrete is cast on the ground surface in the underfloor space.

Here, the heat insulating material has a thin-walled portion in which the thickness of the lower end portion gradually decreases toward the rising portion toward the base portion, and the moisture-proof concrete is in close contact with the thin-walled portion and coincides with the gradual reduction start position of the thin-walled portion. Has a thickness. Therefore, since the moisture-proof concrete may be cast to a thickness that matches the gradual reduction start position of the thickness of the thin-walled portion, it is possible to eliminate the work of measuring the thickness and filling amount of the moisture-proof concrete.

In the heat insulating foundation structure according to the second embodiment of the present invention, in the heat insulating foundation structure according to the first embodiment, the surface of the thin-walled portion on the underfloor space side is an inclined plane, a concave curved surface recessed toward a rising portion, and the like. It is a convex curved surface or a stepped surface that is convex toward the base.

According to the heat insulating foundation structure according to the second embodiment, the surface of the thin-walled portion on the underfloor space side is an inclined plane, a concave curved surface, a convex curved surface or a stepped surface, and therefore, between the surface of the thin-walled portion and the ground surface. In addition, it is possible to form a gap having an appropriate cross-sectional shape into which the moisture-proof concrete can be poured. Therefore, the moisture-proof concrete is firmly filled in the gap, and the surface of the thin-walled portion and the moisture-proof concrete can be firmly adhered to each other.

In the heat insulating foundation structure according to the third embodiment of the present invention, in the heat insulating basic structure according to the first embodiment or the second embodiment, the surface of the thin-walled portion on the underfloor space side is the underfloor space side with respect to the side surface of the rising portion. It is formed along a line forming an angle of 40 to 50 degrees to.

According to the heat insulating foundation structure according to the third embodiment, the surface of the thin-walled portion on the underfloor space side is formed along a line forming an angle of 40 to 50 degrees toward the underfloor space side with respect to the side surface of the rising portion. , A gap having an appropriate cross-sectional shape can be formed between the surface of the thin portion and the ground surface. Therefore, the moisture-proof concrete is firmly filled in the gap, and the surface of the thin-walled portion and the moisture-proof concrete can be firmly adhered to each other. In addition, since the height from the ground surface to the gradual reduction start position matches the thickness of the heat insulating material, it is possible to place an appropriate amount of moisture-proof concrete equal to the thickness of the heat insulating material.

The method of constructing the heat insulating foundation structure according to the fourth embodiment of the present invention has a base portion embedded in the ground and a rising portion standing on the base portion and protruding from the ground surface, surrounding the ground surface and under the floor. A step of forming a foundation for forming a space and a step of adding a heat insulating material having a thin wall portion on the side surface of the rising portion on the underfloor space side, where the thickness of the lower end portion gradually decreases toward the rising portion toward the base portion. It is provided with a step of placing a moisture-proof concrete having a thickness that is in close contact with the thin-walled portion and has a thickness that matches the starting position of the gradual decrease in the thickness of the thin-walled portion on the ground surface in the underfloor space.

The method of constructing the heat insulating foundation structure according to the fourth embodiment includes a step of forming the foundation, a step of adding a heat insulating material, and a step of placing moisture-proof concrete. The foundation has a base portion buried in the ground and a rising portion that is erected on the base portion and protrudes from the ground surface. In the process of forming the foundation, an underfloor space is formed by surrounding the ground surface. In the process of adding the heat insulating material, the heat insulating material is added to the side surface of the rising portion on the underfloor space side. In the process of placing the moisture-proof concrete, the moisture-proof concrete is placed on the ground surface in the underfloor space.

Here, the heat insulating material has a thin-walled portion in which the thickness of the lower end portion gradually decreases toward the rising portion toward the base portion, and in the process of placing the moisture-proof concrete, the thickness of the thin-walled portion is matched with the gradual decrease start position. Moisture-proof concrete is placed to the thickness. Therefore, it is possible to eliminate the work of measuring the thickness and filling amount of the moisture-proof concrete.
Furthermore, since the moisture-proof concrete can be placed immediately after the heat insulating material is attached, the construction period is shortened as compared with the case where the moisture-proof concrete is placed and dried before the heat insulating material is added to the foundation. be able to.

The heat insulating foundation structure and the construction method thereof according to the present invention have an excellent effect that workability can be improved.

It is sectional drawing which shows the heat insulation basic structure which concerns on one Embodiment of this invention. FIG. 5 is an enlarged cross-sectional view showing an enlarged contact portion between the heat insulating material of the heat insulating foundation structure shown in FIG. 1 and the moisture-proof concrete. It is 1st process sectional view explaining the construction method of the heat insulation foundation structure shown in FIG. It is a 2nd process sectional view explaining the construction method. It is an enlarged cross-sectional view corresponding to FIG. 2 of the heat insulation foundation structure which concerns on the 1st modification of one Embodiment. It is an enlarged sectional view corresponding to FIG. 2 of the heat insulation foundation structure which concerns on 2nd modification. It is an enlarged sectional view corresponding to FIG. 2 of the heat insulation foundation structure which concerns on 3rd modification.

Hereinafter, with reference to FIGS. 1 to 7, a heat insulating foundation structure and a construction method thereof according to an embodiment of the present invention applied to a general house or a building will be described.

(Structure of heat insulating foundation structure)
As shown in FIG. 1, the heat insulating foundation structure 10 according to the present embodiment includes a foundation 12 of a general house or a building, a heat insulating material 20, and a moisture-proof concrete 30.

The foundation 12 includes a base portion 12A embedded in the ground 14 and a rising portion 12B standing upward from the widthwise intermediate portion of the base portion 12A and protruding from the ground surface GL.
The base portion 12A is constructed on the crushed stone 16 buried in the ground 14 or the discarded concrete (not shown) on the crushed stone 16 as a base.
The rising portion 12B has a rectangular cross-sectional shape having a longitudinal direction perpendicular to the ground surface GL and a constant width, and is integrally constructed with the base portion 12A.
The base portion 12A and the rising portion 12B are made of reinforced concrete reinforced with hard metal. That is, the foundation 12 in the present embodiment is a so-called cloth foundation having an inverted T-shaped cross section.

The foundation 12 is arranged so as to surround the ground surface GL along the contour of the horizontal cross section of a general house or a building. It is surrounded by a rising portion 12B surrounding the ground surface GL of the foundation 12, a ground surface GL surrounded by the rising portion 12B, and a floor (not shown) arranged on the foundation 12 facing the ground surface GL. The space is the underfloor space 18.

The heat insulating material 20 is attached to the side surface 12C of the rising portion 12B on the underfloor space 18 side. The heat insulating material 20 is formed in a rectangular plate shape with the width direction of the rising portion 12B as the thickness direction, and the heat insulating material 20 is made of a foamed resin-based rigid urethane foam having a thickness of, for example, 60 mm. As shown in FIG. 2, the heat insulating material 20 is adhered to the rising portion 12B by using an adhesive material 22 applied to a thickness of, for example, 5 mm.

As shown in FIGS. 1 and 2, the heat insulating material 20 includes a thin portion 20A in which the thickness (horizontal cross section) of the lower end portion gradually decreases toward the rising portion 12B toward the base portion 12A. In particular, as shown in FIG. 2, the surface 20B of the thin-walled portion 20A on the underfloor space 18 side is relative to the side surface 12C of the rising portion 12B with the intersection of the side surface 12C of the rising portion 12B and the ground surface GL as the base point BP. It is formed along a line (virtual line drawn for convenience) IL forming an angle α toward the underfloor space 18 side. In the present embodiment, the angle α is set in the range of 40 degrees to 50 degrees, preferably 45 degrees. The surface 20B of the thin portion 20A is an inclined plane (tapered surface) formed along the line IL.
The upper end of the surface 20B of the thin-walled portion 20A, that is, the intersection of the surface 20B and the surface of the heat insulating material 20 on the underfloor space 18 side is set to the gradual reduction start position 20C of the thickness of the thin-walled portion 20A. That is, the thin portion 20A is formed on the heat insulating material 20 by diagonally cutting the underfloor space 18 side of the lower end portion of the heat insulating material 20 from the gradual reduction start position 20C toward the ground surface GL.

The moisture-proof concrete 30 is placed on the ground surface GL in the underfloor space 18. For example, mortar is used as the moisture-proof concrete 30. The moisture-proof concrete 30 is set to a thickness that matches the gradual reduction start position 20C of the thin-walled portion 20A. That is, the tapering start position 20C is set as a "scale" that determines the thickness of the moisture-proof concrete 30, and the moisture-proof concrete 30 is formed up to the position of this "scale".
For example, when the angle α formed by the surface 20B of the thin portion 20A is set to 45 degrees, the height of the gradual reduction start position 20C from the ground surface GL is 60 mm. When the moisture-proof concrete 30 is cast up to the gradual reduction start position 20C, the thickness of the moisture-proof concrete 30 is set to 60 mm, which is equal to the thickness of the heat insulating material 20.
Here, the moisture-proof concrete 30 is directly placed on the ground surface GL. For example, the moisture-proof concrete 30 is placed on the ground surface GL via a moisture-proof sheet, or on the ground surface GL via crushed stone and a moisture-proof sheet in sequence. Concrete 30 may be constructed.

(Construction method of heat insulating foundation structure)
The construction method of the heat insulating foundation structure 10 is as follows.
First of all, as shown in FIG. 3, the foundation 12 is formed on the ground 14. The foundation 12 includes a base portion 12A and a rising portion 12B. The base portion 12A is embedded in the ground 14, and the rising portion 12B is formed so as to project from the base portion 12A onto the ground surface GL. The rising portion 12B surrounds the ground surface GL, and this surrounded space is defined as the underfloor space 18.

Next, as shown in FIG. 4, the heat insulating material 20 is attached to the side surface 12C of the rising portion 12B on the underfloor space 18 side. The heat insulating material 20 is adhered to the side surface 12C via the adhesive material 22 (see FIG. 2). At the lower end of the heat insulating material 20, a thin-walled portion 20A whose thickness gradually decreases is formed before installation, and in a state where the downward tip of the thin-walled portion 20A is in contact with the ground surface GL, the heat insulating material 20 rises to the rising portion 12B. It will be attached to. A gap having a right-angled triangular cross-sectional shape is formed between the surface 20B of the thin portion 20A and the ground surface GL.

Next, as shown in FIGS. 1 and 2 described above, the moisture-proof concrete 30 is placed on the ground surface GL in the underfloor space 18. The tapering start position 20C of the thin portion 20A is set as a "scale", and the moisture-proof concrete 30 is filled until the tapering start position 20C is on the upper surface. After filling, the moisture-proof concrete 30 is hardened. At the time of filling, the moisture-proof concrete 30 flows firmly into the gap between the thin-walled portion 20A and the ground surface GL, and the moisture-proof concrete 30 is hardened in a state of being firmly adhered to the surface 20B of the thin-walled portion 20A.
When the moisture-proof concrete 30 is cast, the construction of the heat-insulating foundation structure 10 according to the present embodiment is completed.

(Action and effect of this embodiment)
As shown in FIG. 1, the heat insulating foundation structure 10 according to the present embodiment includes a foundation 12, a heat insulating material 20, and a moisture-proof concrete 30. The foundation 12 has a base portion 12A embedded in the ground 14 and a rising portion 12B standing on the base portion 12A and protruding from the ground surface GL, and surrounds the ground surface GL to form an underfloor space 18. The heat insulating material 20 is attached to the side surface 12C of the rising portion 12B on the underfloor space 18 side. The moisture-proof concrete 30 is cast on the ground surface GL in the underfloor space 18.

Here, as shown in FIG. 2, the heat insulating material 20 has a thin-walled portion 20A in which the thickness of the lower end portion gradually decreases toward the rising portion 12B toward the base portion 12A. The moisture-proof concrete 30 is in close contact with the thin-walled portion 20A and has a thickness that matches the gradual reduction start position 20C of the thin-walled portion 20A.
Therefore, since the moisture-proof concrete 30 may be placed to a thickness that matches the gradual reduction start position 20C of the thickness of the thin-walled portion 20A, the work of measuring the thickness and the filling amount of the moisture-proof concrete 30 can be eliminated. That is, if the moisture-proof concrete 30 is placed to a thickness that matches the gradual reduction start position 20C, the moisture-proof concrete 30 having a preset thickness can be constructed. Therefore, the heat insulating foundation structure 10 can improve the workability.

Further, in the heat insulating foundation structure 10 according to the present embodiment, as shown in FIG. 2, the surface 20B of the thin wall portion 20A on the underfloor space 18 side is an inclined plane. Therefore, a gap having an appropriate cross-sectional shape of a right triangle into which the moisture-proof concrete 30 can be poured can be formed between the surface 20B of the thin portion 20A and the ground surface GL. Therefore, the moisture-proof concrete 30 is firmly filled in the gap, and the surface 20B of the thin-walled portion 20A and the moisture-proof concrete 30 can be firmly adhered to each other.

Further, in the heat insulating foundation structure 10 according to the present embodiment, as shown in FIG. 2, the surface 20B on the underfloor space 18 side of the thin-walled portion 20A is 40 degrees toward the underfloor space 18 side with respect to the side surface 12C of the rising portion 12B. It is formed along a line IL forming an angle α of ~ 50 degrees. As a result, a gap having an appropriate cross-sectional shape of a right triangle into which the moisture-proof concrete 30 can be poured can be formed between the surface 20B of the thin portion 20A and the ground surface GL.
Here, if the angle α formed by the surface 20B of the thin portion 20A is less than 40 degrees, the thickness of the moisture-proof concrete 30 becomes thick and the amount of the moisture-proof concrete 30 used increases, so that the construction cost increases. On the contrary, when the angle α exceeds 50 degrees, the gap between the surface 20B of the thin-walled portion 20A and the ground surface GL is small, and it becomes difficult for the moisture-proof concrete 30 to flow into this gap. When the angle α is set to 45 degrees, a gap having an appropriate cross-sectional shape is formed, and the height from the ground surface GL to the gradual reduction start position 20C can be matched with the thickness of the heat insulating material 20.
Therefore, in the heat insulating foundation structure 10, the moisture-proof concrete 30 is firmly filled in the gap between the surface 20B of the thin-walled portion 20A and the ground surface GL, and the surface 20B and the moisture-proof concrete 30 can be firmly adhered to each other.
In addition, since the height from the ground surface GL to the gradual reduction start position 20C matches the thickness of the heat insulating material 20, the moisture-proof concrete 30 having an appropriate filling amount equal to the thickness of the heat insulating material 20 can be easily placed. Can be done.

Further, the construction method of the heat insulating foundation structure 10 according to the present embodiment includes a step of forming the foundation 12 shown in FIG. 3, a step of attaching the heat insulating material 20 shown in FIG. 4, and FIGS. 1 and 2. It is provided with a step of placing the moisture-proof concrete 30 shown in the above.
The foundation 12 has a base portion 12A embedded in the ground 14 and a rising portion 12B standing on the base portion 12A and protruding from the ground surface GL. In the process of forming the foundation 12, the foundation 12 surrounds the ground surface GL and is an underfloor space. 18 is formed. In the step of adding the heat insulating material 20, the heat insulating material 20 is attached to the side surface 12C of the rising portion 12B on the underfloor space 18 side. In the step of placing the moisture-proof concrete 30, the moisture-proof concrete 30 is placed on the ground surface GL in the underfloor space 18.

Here, the heat insulating material 20 has a thin portion 20A in which the thickness of the lower end portion gradually decreases toward the rising portion 12B toward the base portion 12A. In the step of placing the moisture-proof concrete 30, the moisture-proof concrete 30 is placed to a thickness that matches the gradual decrease start position 20C of the thickness of the thin-walled portion 20A. Therefore, since it is possible to eliminate the work of measuring the thickness and filling amount of the moisture-proof concrete 30, the workability can be improved by the construction method of the heat insulating foundation structure 10.

Further, in the construction method of the heat insulating foundation structure 10, the moisture-proof concrete 30 can be filled immediately after the heat insulating material 20 is attached. Therefore, when the heat insulating material is added to the foundation after the moisture-proof concrete is filled and hardened. Compared to, the construction period can be shortened.
Specifically, when a heat insulating material is added to the foundation after filling and hardening the moisture-proof concrete, a construction period of 2 days is required. On the other hand, in the construction method of the heat insulating foundation structure 10 according to the present embodiment, the moisture-proof concrete 30 can be filled immediately after the heat insulating material 20 is attached to the foundation 12, so that the moisture-proof concrete 30 is hardened. There is no need to wait until one day is enough for the construction period.

(First modification)
Next, the heat insulating foundation structure 10 according to the first modification will be described with reference to FIG. In addition, in the 1st modification, and the 2nd modification and the 3rd modification described later, the same component as the component of the heat insulating foundation structure 10 according to the above-described embodiment or substantially the same component is the same. The reference numerals are given, and duplicate description will be omitted. Further, since the construction method of the heat insulating foundation structure 10 according to the first modification to the third modification is the same as the construction method of the heat insulation foundation structure 10 according to one embodiment, the description thereof will be omitted.

As shown in FIG. 5, in the heat insulating foundation structure 10 according to the first modification, the surface 20D of the thin wall portion 20A on the underfloor space 18 side of the heat insulating material 20 is a concave curved surface recessed toward the rising portion 12B side. It is said that. The surface 20D is formed along the line IL forming an angle α, similarly to the surface 20B of the thin-walled portion 20A of the heat insulating foundation structure 10 according to the embodiment. A gap having an appropriate cross-sectional shape of a substantially right triangle can be formed between the surface 20D and the ground surface GL.

In the heat insulating foundation structure 10 according to the first modification and the construction method in which the description is omitted, the same working effects as those obtained by the heat insulating basic structure 10 and the construction method according to the above-described embodiment can be obtained. ..

(Second modification)
The heat insulating foundation structure 10 according to the second modification will be described with reference to FIG. As shown in FIG. 6, in the heat insulating foundation structure 10 according to the second modification, the surface 20E of the thin wall portion 20A on the underfloor space 18 side of the heat insulating material 20 is a convex curved surface that is projected toward the base portion 12A side. It is said that. The surface 20E is formed along the line IL forming an angle α, similarly to the surface 20D of the heat insulating foundation structure 10 according to the first modification. A gap having an appropriate cross-sectional shape of a substantially right triangle can be formed between the surface 20E and the ground surface GL.

In the heat insulating foundation structure 10 according to the second modification and the construction method in which the description is omitted, the same working effects as those obtained by the heat insulating basic structure 10 and the construction method according to the above-described embodiment can be obtained. ..

(Third modification example)
The heat insulating foundation structure 10 according to the third modification will be described with reference to FIG. 7. As shown in FIG. 7, in the heat insulating foundation structure 10 according to the third modification, the surface 20F of the thin wall portion 20A on the underfloor space 18 side of the heat insulating material 20 is a stepped surface. The surface 20F is formed along the line IL forming an angle α, similarly to the surface 20D of the heat insulating foundation structure 10 according to the first modification. A gap having an appropriate cross-sectional shape of a substantially right triangle can be formed between the surface 20F and the ground surface GL.

In the heat insulating foundation structure 10 according to the third modification and the construction method in which the description is omitted, the same working effects as those obtained by the heat insulating basic structure 10 and the construction method according to the above-described embodiment can be obtained. ..

Further, in the heat insulating foundation structure 10 according to the third modification, the gradual reduction start position 20C of the thin wall portion 20A in the heat insulating material 20 is set as a “scale” for setting the thickness of the moisture-proof concrete 30, but further, 1 on the surface 20F. One or more steps can be used as a "scale".
For example, if each step from the gradual reduction start position 20C to the surface 20F is set at intervals of 10 mm, the thickness of the moisture-proof concrete 30 can be adjusted at intervals of 10 mm. As an example, the moisture-proof concrete 30 whose thickness is set to 60 mm when it matches the gradual decrease start position 20C is the moisture-proof concrete 30 when it matches the step position of the first step downward from the gradual decrease start position 20C on the surface 20F. The thickness of the concrete can be adjusted to 50 mm.

[Supplementary Description of the above Embodiment]
The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist thereof.
For example, in the present invention, a foamed resin-based heat insulating material such as polystyrene foam, phenol foam, or foamed polycarbonate may be used as the heat insulating material. Further, in the present invention, a mineral-based or recycled fiber-based heat insulating material can also be used as the heat insulating material.
Further, the present invention is not limited to, for example, a single foam-based heat insulating material as the heat insulating material, and a heat insulating material in which a paper or resin sheet is attached to one surface or the other surface of the foam-based heat insulating material. May be used.

10 Insulation foundation structure 12 Foundation 12A Base part 12B Rise part 14 Ground 18 Underfloor space 20 Insulation material 20A Thin wall part 20B, 20D, 20E, 20F Surface 20C Gradual reduction start position 30 Moisture-proof concrete GL Ground surface IL line

Claims (4)

A foundation that has a base portion buried in the ground and a rising portion that stands on the base portion and projects from the ground surface, and surrounds the ground surface to form an underfloor space.
A heat insulating material having a thin portion attached to the side surface of the rising portion on the underfloor space side and having a thin wall portion in which the thickness of the lower end portion gradually decreases toward the rising portion toward the base portion.
Moisture-proof concrete that is cast on the ground surface in the underfloor space, is in close contact with the thin-walled portion, and has a thickness that matches the gradual decrease start position of the thickness of the thin-walled portion.
Insulated foundation structure with. The surface of the thin-walled portion on the underfloor space side is an inclined flat surface, a concave curved surface recessed toward the rising portion, a convex curved surface convex toward the base portion, or a stepped surface. The heat insulating basic structure according to claim 1. Claim 1 or claim 2 in which the surface of the thin-walled portion on the underfloor space side is formed along a line forming an angle of 40 to 50 degrees toward the underfloor space side with respect to the side surface of the rising portion. Insulation basic structure described in. A step of forming a foundation that has a base portion buried in the ground and a rising portion that is erected on the base portion and protrudes from the ground surface and surrounds the ground surface to form an underfloor space.
A step of adding a heat insulating material having a thin-walled portion whose thickness of the lower end portion gradually decreases toward the rising portion toward the base portion on the side surface of the rising portion on the underfloor space side.
A step of placing moisture-proof concrete in the underfloor space on the ground surface, which is in close contact with the thin-walled portion and has a thickness that matches the gradual decrease start position of the thickness of the thin-walled portion.
Construction method of heat insulating foundation structure equipped with.

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