JP2018145784A - Floor heat insulation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor heat insulation structure that may not affect the ventilation characteristic of ventilation packing provided on the groundsill side even in such a manner that a heat insulation material is also disposed on the underside of sleeper.SOLUTION: The floor heat insulation structure comprises: first heat insulation materials 10 that are disposed, respectively, between a groundsill 2 placed on a foundation 1 and a sleeper 3 adjacently provided thereto, and between the sleepers 3 adjacent to each other; second heat insulation materials 20 where their top faces 20a are disposed on undersides 10b of the first heat insulation materials 10 and also disposed on the underside 3b of the sleeper 3, and the position of undersides 20b are disposed so as to locate on upper side than the position of ventilation packing 4 provided on the groundsill 2 side; and fixation pins 30a that are fixed at the groundsill 2 and the sleeper 3 respectively, and support the second heat insulation materials 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floor heat insulating structure, and more particularly, to a heat insulating structure for a floor constructed by a joistless method.

  Conventionally, when constructing a building such as a house, a heat insulating material such as glass wool is attached under the floor to ensure heat insulation. Patent Document 1 discloses a heat insulating structure for a floor that has no joist, which can effectively use the space above the floor, that is, a floor constructed by a so-called joist-less construction method (rigid floor construction method).

  That is, in the floor heat insulating structure disclosed in Patent Document 1, a heat insulating material is disposed between adjacent large draws, and a heat insulating material is also disposed immediately below the large draw, that is, the lower surface of the large draw. ing. As described above, when a heat insulating material is also provided in the large drawing, the large drawing itself can be prevented from becoming a thermal bridge, and the heat insulation effect of the entire floor can be enhanced.

JP 2014-77331 A

However, the conventional floor insulation structure in which the heat insulating material is disposed between the adjacent large draws and the heat insulation material is also disposed on the lower surface of the large draw prevents the large draw from becoming a thermal bridge. The heat insulation effect of the entire floor can be enhanced, but when the heat insulating material is simply disposed on the lower surface of the large pull, it can be removed from the ventilation packing and the vent provided on the base side. There is a possibility of adversely affecting underfloor ventilation.
This is because the heat insulating material is arranged not only between adjacent large draws, but also between the base and the large draw, so when the thickness of the arranged heat insulation material increases, it is provided on the base side. This is because there is a concern that the ventilation means used may be blocked and adversely affect the underfloor ventilation.

  The present invention has been made in view of the above-described problems, and even if a heat insulating material is disposed on the lower surface of the fork, it does not affect the air permeability of the ventilation means provided on the base side. It aims to provide a floor insulation structure.

  In order to achieve the above object, the floor heat insulating structure according to the present invention is provided between a base placed on a foundation and a large pull provided adjacent to the base, and between adjacent large pulls. A first heat insulating material disposed on the lower surface of the first heat insulating material, and an upper surface disposed on the lower surface of the fork, and the position of the lower surface on the base side A second heat insulating material disposed so as to be positioned above the position of the venting means provided, and a fixing means that is fixed to the base and the fork, and supports the second heat insulating material, It is characterized by consisting of.

  In the floor heat insulating structure according to the present invention, the first heat insulating material is disposed between the base and the large fork and between the adjacent large forks, and the lower surface of the first heat insulating material and the large fork. Since the second heat insulating material is disposed on the lower surface, it is possible to prevent the overdraw from becoming a thermal bridge and to enhance the heat insulating effect of the floor. And since the lower surface position of the 2nd heat insulating material is located above the upper surface position of a ventilation means, a ventilation means is not obstruct | occluded by a 2nd heat insulating material, and it can keep favorable underfloor ventilation. .

  Further, in the floor heat insulating structure according to the present invention, it is preferable that the first heat insulating material has a cotton shape, and the second heat insulating material has a plate shape having a self-holding property.

  In the floor heat insulating structure according to the present invention, since the first heat insulating material is located above the plate-shaped second heat insulating material having excellent self-shape retaining property, the first heat insulating material is used as the second heat insulating material. Can be held stably.

  Further, in the floor heat insulating structure according to the present invention, the fixing means includes a vertical piece having a length equal to the sum of the thickness of the first heat insulating material and the thickness of the second heat insulating material, An upper piece connected to the upper end and placed on the upper surface of the base or the large pull; and a lower piece connected to the lower end of the vertical piece and placing the lower surface of the second heat insulating material. It is characterized by being.

  In the floor heat insulating structure according to the present invention, the fixing means has an upper piece placed on the upper surface of the base or the large pull at the upper end of the vertical piece, and the lower surface of the second heat insulating material is placed on the lower end of the vertical piece. Since it has the lower piece to do, the heat insulating material which consists of a 1st heat insulating material and a 2nd heat insulating material can be supported easily.

  The floor heat insulation structure according to the present invention can prevent large pulls from becoming thermal bridges and can enhance the heat insulation effect of the floor. And since the lower surface position of the 2nd heat insulating material is located above the upper surface position of a ventilation means, a ventilation means is not obstruct | occluded by a 2nd heat insulating material, and it can keep favorable underfloor ventilation. .

It is a longitudinal cross-sectional view of the floor heat insulation structure by the 1st Embodiment of this invention. It is a perspective view of the fixing pin used for the floor heat insulation structure of FIG. It is a longitudinal cross-sectional view of the floor heat insulation structure by the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the floor heat insulation structure by the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the floor heat insulation structure by the 4th Embodiment of this invention. It is a perspective view of the fixed pin by the 1st modification. It is a perspective view of the fixing pin by the 2nd modification. It is a perspective view of the fixing pin by the 3rd modification. It is a longitudinal cross-sectional view which shows the structure of the fixing pin by a 4th modification. It is a longitudinal cross-sectional view which shows the principal part of the floor heat insulation structure by a 5th modification. It is a longitudinal cross-sectional view of the floor heat insulation structure by the 5th Embodiment of this invention. It is a longitudinal cross-sectional view of the floor heat insulation structure by the 6th Embodiment of this invention. It is a longitudinal cross-sectional view of the floor heat insulation structure by the 6th Embodiment of this invention, Comprising: It is a figure which shows the modification of the 1st fixing pin in FIG.

  Hereinafter, a floor heat insulating structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

(First embodiment)
As shown in FIG. 1, the floor heat insulating structure according to the present embodiment is a floor structure having no joist, that is, a floor structure constructed by a so-called joistless construction method, and FIG. 1 shows a part of the floor structure. . Since the floor heat insulation structure according to the present embodiment is applied to a joistless floor structure, the joistless floor structure will be described first. The joistless floor structure shown in FIG. 1 includes a foundation 1, a base 2, a large pull 3, and a ventilation packing 4.

  The foundation 1 is made of reinforced concrete that is used in a building such as a general house, and is formed to rise upward from a ground (not shown). The rising upper surface 1a is formed to be slightly larger than the width of the lower surface 2b (bottom surface) of the base 2 described later. The structure of the foundation 1 may be either a solid foundation having a rising portion and a bottom plate (not shown) or a fabric foundation having a rising portion and a footing (not shown). The foundation in the floor portion to which the floor heat insulating structure according to the present embodiment is applied. No heat insulating material is provided on the inner and outer surfaces of 1.

  The base 2 is made of wooden square material, and is configured to be fixed on the foundation 1 via bolts (not shown) that are planted on the upper surface 1a side of the foundation 1 at a predetermined interval. The base 2 is not limited to a wooden square, and may be made of hollow steel.

  The large pull 3 is usually made of a wooden square member having a smaller cross-sectional shape than the base 2, and is disposed between the opposing bases 2 at a predetermined interval, for example, at an interval of 90 cm. In the example of FIG. 1, only one overdraw 3 is shown, but actually, a plurality of overdraws are provided between a base (not shown) provided to face the base 2. In addition, the large drawing 3 is not restricted to a wooden square, and may be made of hollow steel.

  As with the well-known drawing, the large drawing 3 is fixed at both ends in the longitudinal direction to a base (not shown), and a plurality of portions on the bottom surface 3b (bottom surface) in the longitudinal direction of the drawing 3 are provided on the ground. It is configured to be held by a floor bundle placed on a bundle of stones.

  In the relationship between the base 2 and the large pull 3, the surface connecting the upper surface 2a of the base 2 and the upper surface 3a of the large pull 3 is configured to coincide with the same horizontal plane. Therefore, when a floor board (not shown) is placed and fixed between the upper surfaces of the base 2 and the large fork 3, the floor board can be kept on the same horizontal plane.

  Further, in the relationship between the base 2 and the large pull 3, since the cross-sectional shape of the large pull 3 is smaller than the cross-sectional shape of the base 2, the position of the lower surface 3b of the large pull 3 is more than the position of the lower surface 2b of the base 2. Will also be positioned above that difference.

  The difference will be described by applying specific dimensions. When the base 2 is a 120 mm square material and the large pull 3 is a 90 mm square material, the position of the lower surface 3b of the large pull 3 is larger than the 120 mm of the base 2. The difference of 30 mm obtained by subtracting 90 mm of the pull 3 is positioned above the position of the lower surface 2 b of the base 2.

  The ventilation packing 4 is an example of the ventilation means of the present embodiment. Like the known ventilation packing, the ventilation packing 4 is made of a flat plate made of synthetic resin or metal and has a thickness of about 2 to 3 cm. It is provided between 1 a and the lower surface 2 b of the base 2. That is, since this ventilation packing 4 is provided between the foundation 1 and the base 2, the base 2 forms a kind of cat base.

  As shown by a chain line arrow in FIG. 1, air can freely move inside the ventilation packing 4 on the outside (left side of the foundation 1 in FIG. 1) and on the lower floor side (right side of the foundation 1 in FIG. 1). Many through holes (not shown) are provided. The ventilation packing 4 is provided at a predetermined interval along the longitudinal direction of the lower surface 2 b of the base 2. The ventilation packing 4 may be provided so as to cover the entire lower surface 2 b of the base 2.

  Next, a first embodiment of a floor heat insulating structure applied to a joistless floor structure having the above configuration will be described. That is, the floor heat insulating structure includes the first heat insulating material 10, the second heat insulating material 20, and the first fixing pin 30a (fixing means).

  The 1st heat insulating material 10 is comprised with fiber type heat insulating materials, such as glass wool and rock wool, which are often used as a heat insulating material of floors and walls of buildings such as ordinary houses. In other words, the first heat insulating material 10 is formed by intertwining fibers, includes a large number of air layers therein, has flexibility, is relatively lightweight, and has a so-called cotton shape. Therefore, it can be easily installed by filling the space between the large draw 3.

  The first heat insulating material 10 is disposed between the base 2 and the large fork 3 and with a thickness of the height of the large fork 3. And the 1st heat insulating material 10 is also the thickness of the height 3 of the large drawing 3 and the large drawing (not shown) adjacent to this large drawing 3 (the large drawing located on the opposite side to the base 2). Arranged. And between the base (not shown) opposite to the base 2 and the large drawing (not shown), a first similar to the first heat insulating material 10 disposed between the base 2 and the large drawing 3 is provided. The heat insulating material is disposed. The first heat insulating material 10 may have a single layer structure as long as it has a thickness equivalent to the thickness of the large pull 3, and a multilayer having a thickness equivalent to the thickness of the large pull 3 by stacking two or more sheets. The structure of may be sufficient.

  The second heat insulating material 20 is made of a foamed plastic heat insulating material such as a beaded polystyrene foam, an extruded polystyrene foam, a rigid urethane foam, or a phenol foam, and the second heat insulating material 20 is excellent in heat insulating properties. At the same time, it is light and has a plate shape with self-retaining properties. Therefore, the second heat insulating material 20 can be placed without changing its shape even when the first heat insulating material 10 is placed on the upper surface 2a.

  The second heat insulating material 20 has an upper surface 20 a disposed on the entire lower surface 10 b of the first heat insulating material 10, and is disposed on the entire lower surface 3 b of the large pull 3. At this time, the upper surface 20 a of the second heat insulating material 20 may be in contact with the entire lower surface 10 b of the first heat insulating material 10 and the entire lower surface 3 b of the large pull 3. And the thickness of the 2nd heat insulating material 20 should just be arrange | positioned so that the position of the lower surface 20b of the 2nd heat insulating material 20 can ensure the air permeability of the ventilation packing 4, Preferably, it is from the ventilation packing 4. It is determined to be located on the upper side. In the example of FIG. 1, the position of the lower surface 20 b of the second heat insulating material 20 is configured to substantially coincide with the position of the upper surface 4 a of the ventilation packing 4. More precisely, the position of the lower surface 20b of the second heat insulating material 20 is higher than the position of the upper surface 4a of the ventilation packing 4 by the thickness of the lower piece 33 of the first fixing pin 30a described later. Therefore, the second heat insulating material 20 does not impair the breathability of the ventilation packing 4.

The thickness of the second heat insulating material 20 will be described by applying specific dimensions. When the base 2 is a 120 mm square member and the large pull 3 is a 90 mm square member, the position of the lower surface 3b of the large pull 3 Is positioned 30 mm above the position of the lower surface 2 b of the base 2, the thickness of the second heat insulating material 20 is determined within 30 mm, and the thermal bridge of the large pull 3 is within that thickness. To the extent that can be prevented. Therefore, if the thickness of the second heat insulating material 20 is within 30 mm, the air permeability of the ventilation packing 4 is not affected. Moreover, since the heat insulation layer is added to the 1st heat insulating material 10 by the thickness of the 2nd heat insulating material 20, the 2nd heat insulating material 20 improves the heat insulation effect of a floor more.
In addition, the thickness of the 2nd heat insulating material 20 in the said description is a thing about the case where the base 2 and the big drawing 3 are a specific magnitude | size, and it changes according to the magnitude | size of the base 2 and the big drawing 3. However, the thickness of the second heat insulating material 20 is preferably 15 mm or more from the viewpoint of preventing thermal bridges, and is preferably 60 mm or less from the viewpoint of fit and workability.

Here, although the fiber-based heat insulating material constituting the first heat insulating material 10 is easy to fill between the large draws 3, it has a low self-holding property and hangs down by its own weight after a long period of time, and the second heat insulating material 20 The load is applied.
Accordingly, it is preferable that the foamed plastic-based heat insulating material constituting the second heat insulating material 20 has a bending strength defined by JIS K 7221-2 of 15 N / cm ² or more. Accordingly, the first heat insulating material 10 does not deform with respect to the sagging, the air permeability due to the ventilation packing 4 is not hindered in the vicinity of the rising of the foundation 1, and the generation of mold due to moisture and the deterioration of the heat insulating property can be suppressed. it can. Further, since no gap is generated between the second heat insulating materials 20 installed under the large fork 3 even under other floors, the heat insulating property is not impaired.

Moreover, since the 2nd heat insulating material 20 contacts with the external air ventilated with the ventilation packing 4, the thing which cannot absorb the moisture contained in external air is preferable. Therefore, it is preferable that the water absorption amount defined by JIS A 9521 is 5 g / 100 cm ² or less, more preferably 3 g / 100 cm ² or less, and most preferably 2 g / 100 cm ² or less.
Thereby, it can prevent that mold | fungi generate | occur | produce in the heat insulating material 20 which absorbed moisture, or a thermal conductivity raises.

Moreover, since the 2nd heat insulating material 20 contacts with the external air ventilated with the ventilation packing 4, a thing with high moisture-permeable resistance is preferable. Therefore, JIS A 1324: 1995 moisture permeation resistance preferably at least 0.0027m ² · s · Pa / ng defined by (cup method), 0.0100m more preferably at least ^{2 · s · Pa / ng,} 0. 0200 m ² · s · Pa / ng or more is more preferable, and 0.0300 or more is most preferable. On the other hand, if the moisture permeation resistance is too high, the inside of the floor may be condensed due to the inability to permeate to the floor when the indoor humidity is high. Therefore, 0.0800 m ² · s · Pa / ng or less is preferable, 0.0600 m ² · s · Pa / ng or less is more preferable, and 0.0450 m ² · s · Pa / ng or less is most preferable.

Further, heat resistance in view of preventing the thermal bridge defined by JIS A 9521 of the second heat insulating material 20 is preferably not less than ^{0.35m 2 · K / W, 0.60m} 2 · K / W or more preferably 1.0 m ² · K / W or more is most preferable. On the other hand, from the viewpoint of fit and workability, 3.5 m ² · K / W or less is preferable, and 2.0 m ² · K / W or less is more preferable.

In the foamed plastic-based heat insulating material constituting the second heat insulating material 20, the phenol foam has the lowest thermal conductivity, and compared with other heat insulating materials when the thickness of the heat insulating material is the same. Since it can be set as the highest heat insulation performance, it is the most preferable. Further, when the foamed plastic heat insulating material constituting the second heat insulating material 20 is phenol foam, in order to further improve bending strength and compressive strength, glass fiber nonwoven fabric, glass fiber mixed paper, craft paper on both sides of the phenol foam. It is preferable to laminate a face material such as a nylon nonwoven fabric, a polyester nonwoven fabric or a polypropylene nonwoven fabric.
When phenol foam having face materials on both sides is used as the second heat insulating material 20, the thermal conductivity is preferably 0.020 W / m · K or less, more preferably 0.019 W / m · K or less, and 0.018 W / Most preferred is m · K or less.
The heat resistance is preferably not more than 0.75m ² · K / W or 3.33m ² · K / W, more preferably less 1.0m ² · K / W or more 2.5m ² · K / W.
Further, the moisture permeability resistance is preferably 0.0014 m ² · s · Pa / ng or more and 0.057 m ² · s · Pa / ng or less, and 0.0019 m ² · s · Pa / ng or more and 0.045 m ² · s · Pa. / Ng or less is more preferable.
The density is preferably from 15 kg / ^{m 3} or more 40 kg / ^{m 3} or less, 20 kg / ^{m 3} or more 35 kg / ^{m 3} and more preferably less, 27 kg / ^{m 3} or more 32 kg / ^{m 3} or less is most preferred.
Further, compressive strength is preferably at 10 N / cm ² or more, more preferably 13N / cm ² or more, 16N / cm ² or more is most preferable.
Furthermore, the bending strength is preferably 15N / cm ² or more, more preferably 45N / cm ² or more, 55N / cm ² or more is most preferable.
Further, the water absorption amount is preferably 5.0 g / 100 cm ² or less, more preferably 3.0 g / 100 cm ² or less, 2.0 g / 100 cm ² or less being most preferred.

The first heat insulating material 10 may be made of the same foamed plastic heat insulating material as the second heat insulating material 20. The lower the compressive strength of the foamed plastic-based heat insulating material, the easier it is to install it between the draws 3. On the other hand, the first heat insulating material 10 is required to have a certain degree of compressive strength for the purpose of fitting between the large pulls 3 and the prevention of stepping after installation. Therefore, it is preferable that the compressive strength defined by JIS K 7220 is 5N / cm ² or more 25 N / cm ² or less, more preferably 10 N / cm ² or more 20 N / cm ² or less.
Since the compressive strength is proportional to the density, when the foamed plastic heat insulating material constituting the first heat insulating material 10 and the foamed plastic heat insulating material constituting the second heat insulating material 20 are of the same type, the second heat insulating material is used. It is preferable that the density of the foamed plastic heat insulating material constituting the material 20 is higher than the density of the foamed plastic heat insulating material constituting the first heat insulating material 10.

By setting it as the floor heat insulation structure provided with said 1st heat insulating material 10 and 2nd heat insulating material 20, the thermal resistance of a floor heat insulating structure shall be 2.2 m < ² > * K / W or more. The floor heat insulating structure including the first heat insulating material 10 and the second heat insulating material 20 is preferably 3.3 m ² · K / W or more, and more preferably 4.5 m ² · K / W or more. preferable.

  As shown in FIG. 2, the first fixing pin 30 a is made of metal and includes a vertical piece 31, an upper piece 32, and a lower piece 33. The first fixing pin 30a is made by pressing a strip having a predetermined width. The thickness of the band plate is determined within a range in which a floor plate (not shown) can be stretched on the base 2 and the fork 3 without hindrance. The width of the band plate is determined in a range in which the lower piece 33 can sufficiently place the lower surface 20b of the second heat insulating material 20.

  The length of the vertical piece 31 is determined to be equal to the total thickness of the first heat insulating material 10 and the second heat insulating material 20. In the example of FIG. 1, the thickness of the first heat insulating material 10 is equal to the large pull 3, and the thickness of the second heat insulating material 20 is the difference in height between the base 2 and the large pull 3. Therefore, when the above-described specific example is applied, the length of the vertical piece 31 is 120 mm, which is a total of 30 mm of the thickness of the first heat insulating material 10 and the thickness of the second heat insulating material 20.

  The upper piece 32 is formed by bending at a right angle from the upper end portion of the vertical piece 31, and the protruding length of the upper piece 32 from the vertical piece 31 is such that the vertical piece 31 is formed on the upper surface 2 a of the base 2 or the upper surface 3 a of the overdraw 3. It is determined so that it can be sufficiently locked. A claw 34 for integrally biting and fixing the upper piece 32 on the upper surface 2a of the base 2 or the upper surface 3a of the large pull 3 is integrally formed at a substantially central position of the upper piece 32.

  The lower piece 33 is formed of a first lower piece 33a and a second lower piece 33b. The first lower piece 33a is formed by being bent at a right angle in the same direction as the upper piece 32 at the lower end portion of the vertical piece 31 and on one side from the center in the width direction of the vertical piece 31. Further, the second lower piece 33b is formed by being bent at a right angle in the opposite direction to the upper piece 32 at the lower end portion of the vertical piece 31 and on the other side from the central portion in the width direction of the vertical piece 31. And the nail | claw 34 formed integrally with each lower piece 33a, 33b is each provided in the approximate center position of the 1st lower piece 33a and the 2nd lower piece 33b.

  Next, a procedure for constructing the floor heat insulating structure having the above-described structure on a joistless floor structure will be described.

  As shown in FIG. 1, first, the first fixing pins 30 a are respectively attached to the base 2 and the large pull 3. In attaching the first fixing pin 30a to the base 2, the first lower piece 33a of the first fixing pin 30a is bent in the same direction as the second lower piece 33b, and then the upper piece 32 is attached to the upper surface 2a of the base 2. (See FIG. 1). The interval at which the first fixing pin 30a is attached to the base 2 and the large pull 3 is determined within a range in which the lower piece 33 can sufficiently place the lower surface of the second heat insulating material 20.

  After the first fixing pins 30a are respectively attached to the base 2 and the large pull 3, the second heat insulating material 20 is disposed on the lower piece 33 of the first fixing pins 30a. . In addition, the 2nd heat insulating material 20 contact | abutted with the lower surface 3b of the large drawing 3 can also make it fix to the large drawing 3 using a double-sided tape together. Moreover, in the arrangement construction of the second heat insulating material 20, the size between the base 2 and the large drawing 3, the size of the lower surface 3 b of the large drawing 3, the size between the adjacent large drawings 3, etc. Accordingly, it can be performed after appropriately dividing in advance.

  After the second heat insulating material 20 is disposed, the first heat insulating material 10 is disposed on the upper surface 20a of the second heat insulating material 20 disposed between the base 2 and the fork 3 and adjacent to each other. The 1st heat insulating material 10 is arrange | positioned on the upper surface 20a of the 2nd heat insulating material 20 arrange | positioned between the large drawings 3 (refer FIG. 1).

  After the arrangement of the first heat insulating material 10, the structural surface material is stretched in the same manner as the well-known floor structure stretched on the upper surface 3 a of the draw 3 and the upper surface 10 a of the first heat insulating material 10. . Before the structural face material is stretched, a moisture-proof and air-tight film is stretched on the upper surface 3a of the large pull 3 and the upper surface 10a of the first heat insulating material 10 for the purpose of moisture-proofing or air-tightness, An airtight treatment may be carried out with an airtight tape or the like at the joint between the draw 3 and the first heat insulating material 10.

In the floor heat insulating structure having the above-described configuration, the first heat insulating material 10 is disposed between the base 2 and the large pull 3 and between the adjacent large pulls 3. Since the 2nd heat insulating material 20 is each arrange | positioned and comprised on the lower surface 10b and the lower surface 3b of the large drawing 3, it can prevent that the large drawing 3 becomes a thermal bridge, and can improve the heat insulation effect of a floor.
And since the position of the lower surface 20b of the 2nd heat insulating material 20 is located above the upper surface 4a of the ventilation packing 4, the ventilation packing 4 is not obstruct | occluded by the 2nd heat insulating material 20, and underfloor ventilation is carried out. Can keep good.

  In the floor heat insulating structure according to the above-described embodiment, the ventilation packing 4 is used as the ventilation means. However, the ventilation means may be formed by an opening provided in the foundation 1. The opening may be a notch type vent having an upper opening, or may be a vent having a through hole in the foundation 1.

  When the base 1 is provided with a vent opening with a top opening, since the position of the lower surface 2b of the base 2 and the upper surface position of the ventilation hole coincide with each other, the same as when the above-described ventilation packing 4 is used. The position of the lower surface 20b of the second heat insulating material 20 is higher than the position of the upper surface of the vent hole, and the vent hole is not blocked by the second heat insulating material 20, and the underfloor ventilation can be kept good.

  Further, in the case of a vent hole provided with a through hole inside the foundation 1, the upper surface position of the vent hole is located below the position of the upper surface 1 a of the foundation 1. Therefore, the position of the lower surface 20b of the second heat insulating material 20 can be lowered below the position of the upper surface 1a of the foundation 1. For this reason, the position of the lower surface 3b of the large pull 3 can be moved further downward. Thereby, for example, the large drawing 3 which becomes the same position as the lower surface 2b of the base 2 can be used.

  Next, floor insulation structures according to other embodiments and modifications will be described. In addition, the same code | symbol is attached | subjected to the component which has the same function as the component of 1st Embodiment mentioned above, Since description overlaps, detailed description is abbreviate | omitted.

In the first embodiment described above, a fixing pin is used as the fixing means. However, for example, a member that can hold a net-like net, a sheet, or other heat insulating material can be used for the fixing pin. In this case, what is necessary is just to be able to hold | maintain and it is not necessary to install in the floor heat insulation structure whole surface.
In addition, if there is moisture that has entered from the indoor side, it may cause internal condensation, so it is necessary to quickly exhaust the moisture from the floor insulation structure. Therefore, a net-like net or a moisture-permeable sheet, for example, a moisture-permeable waterproof sheet or a sheet having a large number of holes is desirable. In addition, as a moisture-permeable waterproof sheet, it is preferable to use the material prescribed | regulated by JISA6111.
In the following second to fourth embodiments, examples in which a net is used as a fixing means are shown.

(Second Embodiment)
The floor heat insulating structure according to the second embodiment is replaced with the first heat insulating material 10, the second heat insulating material 20, and the first fixing pin 30a (see FIG. 1) described above, as shown in FIG. And a net 5 (fixing means) provided.
The 1st heat insulating material 10 and the 2nd heat insulating material 20 can be arrange | positioned similarly to 1st Embodiment.

The net 5 is disposed so as to be sandwiched between the lower surface 2 b of the base 2 and the ventilation packing 4 provided on the foundation 1. Specifically, the net 5 is arranged in a state where the net 5 is fixed between the plurality of bases 2 and the ventilation packings 4 in the plurality of bases 2, and is fixed by the bases 2 and the ventilation packings 4. It is stretched between the support parts. Thereby, on the stretched net 5, the second heat insulating material 20 can be disposed over the entire lower surface 10 b of the first heat insulating material 10 and the entire lower surface 3 b of the large pull 3. Note that the net 5 is not limited to being a single unit in the arrangement region of the floor heat insulating structure, and a plurality of nets 5 may be provided.
The fixing position of the net 5 may be arranged so as to be secured by the net 5 and the second heat insulating material 20 without impairing the air permeability of the ventilation packing 4. Preferably, the net 5 is positioned above the ventilation packing 4. Good.

Further, the net 5 is fixed to the scattered large draws 3 by the attachment pins 51 from below via the second heat insulating material 20. The position, quantity, pin length, and the like of the mounting pin 51 can be arbitrarily set. Further, the large pull 3 is supported from below by the net 5 through the second heat insulating material 20. The mounting pin 51 for fixing the net 5 to the large pull 3 can be omitted.
Furthermore, the fixing method of the net 5 is not limited to using the mounting pins 51, and for example, double-sided tape, nails, screws, or the like may be employed.

The net 5 contains high density polyethylene (HD), low density polyethylene (LD), polypropylene (PP), ethylene vinyl acetate (EVA), and nylon (PA) as raw materials.
Examples of the shape of the mesh of the net 5 include a circle and a polygon. Among the polygons, a hexagon, a square, a rhombus, and the like are particularly preferable.
The yield point strength (N / m) of the net 5 may be 1000 to 12000 N / m and preferably 1200 to 10000 N / m in the longitudinal direction. The yield point strength in the width direction may be 500 to 12000 N / m, and preferably 800 to 10,000 N / m. When each yield point strength satisfies the above range, the retention strength of the heat insulating material over a long period can be suitably maintained.
The net 5 may have a thickness of 0.5 to 10 mm, preferably 1 to 8 mm. If the lower limit is not reached, the function of holding the heat insulating material tends to be weakened. If the upper limit is exceeded, the weight increases and the net itself tends to hang.

Open area of the mesh of the net 5 (mm ²⁾ may be any 1~1000mm ^2, 3~900mm ² is preferred. When the opening area is less than the lower limit value, the air permeability tends to be deteriorated, and when it exceeds the upper limit value, the strength of the net is weakened, and the possibility that the heat insulating material cannot be held increases.
The open area ratio (%) of the net of the net 5 may be 10 to 90%, preferably 20 to 80%, and more preferably 30 to 70%. When the open area ratio is lower than the lower limit value, the air permeability tends to be deteriorated. When the open area ratio exceeds the upper limit value, the strength of the net 5 is weakened, and the possibility that the heat insulating material cannot be held increases.
In addition, a hole area and a hole area ratio require that both items satisfy the above range.

  In the second embodiment, since the position of the lower surface 20b of the second heat insulating material 20 supported by the net 5 is located above the upper surface 4a of the air packing 4, the second heat insulating material 20 is used for ventilation. The packing 4 is not blocked and the underfloor ventilation can be kept good.

(Third embodiment)
In the floor heat insulating structure according to the third embodiment shown in FIG. 4, the end 5 a of the net 5 (fixing means) used in the second embodiment described above is attached to the side surface 2 c of the base 2 with the attachment pin 51. It is fixed. And in this Embodiment, it is also possible to fix with the attachment pin 51 from the downward direction via the 2nd heat insulating material 20 with respect to each large drawing 3 scattered like 2nd Embodiment. It is. As described above, in the third embodiment, the end 5 a of the net 5 is not fixed between the base 2 and the ventilation packing 4.
In this case, the horizontal portion of the net 5 can be installed at a horizontal position equivalent to the upper surface 4a of the ventilation packing 4 so as to ensure air permeability.

(Fourth embodiment)
In the net 5 of the floor heat insulating structure according to the fourth embodiment shown in FIG. 5, one end (first end 5b) is fixed to a part of the upper surface 2a of the base 2 with a mounting pin 51, and the side surface 2c of the base 2 One of the upper surfaces 3a of the large pull 3 that is disposed between the end surfaces of the heat insulating materials 10 and 20 and the lower surface 20b of the second heat insulating material 20 and whose other end (second end portion 5c) is adjacent to the base 2. It is fixed to the part with a mounting pin 51. That is, the net 5 is disposed so as to cover the lower surface 20 b of the second heat insulating material 20. At this time, the first end portion 5b and the second end portion 5c of the net 5 are fixed in a state where they are bent in the same direction on the upper surface 2a of the base 2 and the upper surface 3a of the pulling 3, respectively.
The large pull 3 to which the second end portion 5 c of the net 5 is fixed is not limited to the large pull 3 adjacent to the base 2, but is the large pull 3 that is one or more skipped with respect to the base 2. May be.
Further, a horizontal portion of the net 5 that is in contact with the lower surface 20 b of the second heat insulating material 20 is fixed to the lower surface 20 b of the second heat insulating material 20 by a mounting pin 51 from below.

In the fourth embodiment, similarly to the above-described embodiment, the horizontal portion of the net 5 can be installed at a horizontal position equivalent to the upper surface 4a of the ventilation packing 4 so as to ensure air permeability.
By arranging such a net 5 continuously in the horizontal direction, the floor heat insulating materials 10 and 20 can be fixed to the upper surface, and the second heat insulating material 20 can be disposed under the draw 3. High heat insulation performance can be expressed.

In the present embodiment, the first end 5b of the net 5 is fixed to the upper surface 2a of the base 2, and the second end 5c is fixed to the upper surface 3a of the large pull 3, but the first end 5b Both the second end portion 5c and the second end portion 5c may be fixed to the upper surface 3a of the large pull 3.
Further, as shown in FIG. 5, the second end portion 5 c of one net 5 and the first end portion 5 b of the other adjacent net 5 may be overlapped and fixed with a mounting pin 51.

(Modification)
Next, fixing pins 30b to 30e (fixing means) according to modifications will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the component which has the same function as the 1st fixing pin 30a in 1st Embodiment mentioned above, Since description overlaps, detailed description is abbreviate | omitted.

The second fixing pin 30b according to the first modification shown in FIG. 6 has a second lower piece 33b divided into two parts. That is, the second lower piece 33b is the right second lower piece 32 b ₁ is provided at the lower end right side of the vertical piece 31, a second left bottom piece 32 b ₂ is provided at its lower end left. Thus, when the 2nd lower piece 33b is divided and provided, the mounting property of the 2nd heat insulating material 20 can be improved.

  The third fixing pin 30c according to the second modification shown in FIG. 7 is a fixing pin made by plastic molding. The third fixing pin 30c made of plastic has an advantage that it can be manufactured at low cost. In addition, when attaching the 3rd fixing pin 30c to the base 2, since the 1st lower piece 33a cannot be bent to the 2nd lower piece 33b side, the 1st lower piece 33a is excised and used.

The fourth fixing pin 30d according to the third modification shown in FIG. 8 is provided with a notch 31a having a predetermined height directed upward in the vertical piece 31 at the joint portion between the first lower piece 33a and the second lower piece 33b. In addition, a plurality of (two in the illustrated example) folding lines 31b are formed perpendicular to the notches 31a while maintaining a predetermined interval in the height direction of the notches 31a.
Therefore, the fourth fixing pin 30d according to the third modification can be bent by selecting the folding line 31b for the positions of the first lower piece 33a and the second lower piece 33b. Therefore, the bending position of the lower piece 33 (the first lower piece 33a and the second lower piece 33b) can be determined according to the total thickness of the first heat insulating material 10 and the second heat insulating material 20. That is, the fourth fixing pin 30d has a feature capable of dealing with the base 2 and the large pull 3 having different dimensions, or the first heat insulating material 10 and the second heat insulating material 20 having different thicknesses. Yes.

  The fifth fixing pin 30e according to the fourth modification shown in FIG. 9 is provided between the base 2 and the ventilation packing 4, and the base 2 and the second heat insulating material 20 adjacent to the base 2 are arranged on the lower surface side. It is arranged to be connected from. The fifth fixing pin 30e is formed in a plate shape in which the vertical piece 31 and the upper piece 32 shown in FIG. 2 as described above are omitted, and one end of the plate shape is sandwiched between the base 2 and the ventilation packing 4. The claw 34 provided at one end of the claw 34 is engaged with the base 2 and is locked, and the claw 34 provided at the other end is engaged with the second heat insulating material 20 and is engaged. The end of the material 20 on the base 2 side is supported from below and fixed so as not to hang down.

Next, the fifth modification shown in FIG. 10 is configured such that the ventilation packing 4 itself supports the second heat insulating material 20 adjacent to the base 2 from below. That is, the ventilation packing 4 according to the fifth modification employs a member having a larger width dimension than that of the above-described embodiment. Here, the ventilation packing 4 is set between the foundation 1 and the base 2 so that the inner end portion 4b (fixing means) on the side of the foundation inner space protrudes inward from the foundation 1. Yes.
Thus, in the fifth modification, the end of the second heat insulating material 20 on the base 2 side is supported from below by the inner end 4b of the ventilation packing 4, and is fixed so as not to sag.

Furthermore, the floor heat insulation structure by other embodiment of 1st Embodiment mentioned above is demonstrated.
The floor heat insulating structures according to the fifth and sixth embodiments shown in FIG. 11 to FIG. 13 are further improved in heat insulating performance than the first embodiment, while maintaining the breathability of the ventilation packing 4. The thickness of the second heat insulating material 20 is extended downward from a position away from the ventilation packing 4 by a predetermined distance in the water cooling direction.

(Fifth embodiment)
The floor heat insulating structure according to the fifth embodiment shown in FIG. 11 has a configuration in which a notch portion 21 is formed at an end portion in contact with the ventilation packing 4 in the lower portion of the second heat insulating material 20A. The notch 21 is second from a horizontal plane 21A extending in parallel with the height of the upper surface 4a of the ventilation packing 4 or at an upper height, and a position away from the ventilation hole in which the ventilation packing 4 is provided in the horizontal plane 21A. And a thickened surface 21B extending downward in the thickness direction of the heat insulating material 20. That is, in the second heat insulating material 20A in the fifth embodiment, the portion where the notch portion 21 is not provided (thickened portion 20c) is formed thicker than the portion where the notch portion 21 is provided (thin thickness portion 20d). Has been. The position of the lower surface of the thickened portion 20c can be set at a position below the ventilation packing 4 (ventilation hole), for example, as shown in FIG.
And as for the 1st fixing pin 30a, the lower piece 33 is fixed to the horizontal surface 21A of the notch part 21, and the thing from which a dimension differs from the thing of 1st Embodiment is used as needed. In addition, the first fixing pin 30a used for the large pull 3 can also be one having a size different from that of the first embodiment.
Here, the second heat insulating material 20 </ b> A may be integrally formed, or may be configured by, for example, bonding two layers of heat insulating members having different lengths up and down.

  In the fifth embodiment, as compared with a sixth embodiment to be described later, a thin portion 20d of the second heat insulating material 20 below a portion disposed in the vicinity of the base 2 in the first heat insulating material 10. Therefore, favorable heat insulation performance can be expressed.

(Sixth embodiment)
The floor heat insulating structure according to the sixth embodiment shown in FIG. 12 is the second heat insulating material 20 of the first embodiment described above from the position spaced apart from the ventilation packing 4 by a predetermined distance in the horizontal direction (see FIG. 1). The second heat insulating material 20B having a larger thickness is arranged. The second heat insulating material 20B according to the sixth embodiment has the same thickness dimension over the entire surface. Therefore, when manufacturing the second heat insulating material 20B, there is an advantage that it is not necessary to use an odd-shaped mold and the manufacturing becomes easy.
The horizontal separation from the base 2 in the second heat insulating material 20B is set at a position away from the ventilation packing 4 by a predetermined distance to the extent that the air permeability of the through hole of the ventilation packing 4 can be maintained.

  In this case, the first fixing pin 30A has a stepped portion 35 that is bent along the lower surface 10b of the first heat insulating material 10 and the end surface 20e of the second heat insulating material 20B, and the lower piece 33 is the second heat insulating material. The shape is fixed to the lower surface 20b of the material 20B. The step portion 35 has a horizontal portion 35A extending in the horizontal direction away from the base 2, and a vertical portion 35B extending downward from the horizontal portion 35A along the end surface 20e of the second heat insulating material 20B. That is, the first heat insulating material 10 is supported from below by the horizontal portion 35A of the step portion 35 of the first fixing pin 30A on the lower surface 10b near the base 2, and the second heat insulating material 20B is supported from below by the lower piece 33. Has been.

  In the sixth embodiment, as shown in FIG. 13, the shape may be different from that of the first fixing pin 30A. The first fixing pin 30B according to the modification shown in FIG. 13 has a horizontal portion 35A having a height substantially equal to the height of the upper surface 4a of the ventilation packing 4, that is, the height of the lower surface 2b of the base 2. That is, the horizontal portion 35 </ b> A is provided with a space downward from the lower surface 10 b of the first heat insulating material 10. In this case, the first fixing pin 30B is not obstructed by the first fixing pin 30B, and the first fixing pin 30B need not be changed when the thickness of the first heat insulating material 10 changes. There are advantages.

  As mentioned above, although embodiment of the floor heat insulation structure concerning this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. In addition, the constituent elements in the above-described embodiments can be appropriately replaced with known constituent elements without departing from the gist of the present invention.

  For example, it may be applied to a heat insulating structure of a floor constructed by a joist method in which a joist is provided in a direction orthogonal to the joist on the base and the large fork. In this case as well, the base and It is possible to dispose the first heat insulating material 10 between the large pulls and between the large pulls, and to dispose the second heat insulating material 20 so as to be in contact with the entire lower surface of the large pull using the fixing means. .

DESCRIPTION OF SYMBOLS 1 Foundation 1a Upper surface 2 Base 2a Upper surface 2b Lower surface 3 Large drawing 3a Upper surface 3b Lower surface 4 Ventilation packing
4b Inner end (fixing means)
5 Net (fixing means)
DESCRIPTION OF SYMBOLS 10 1st heat insulating material 20, 20A, 20B 2nd heat insulating material 20a Upper surface 30a-30e Fixing pin (fixing means)
30A, 30B Fixing pin (fixing means)
31 Vertical piece 31a Notch 31b Bending line 32 Upper piece 33 Lower piece 33a First lower piece 33b Second lower piece 32b ₁ Right second lower piece 32b ₂ Left second lower piece 34 Claw 51 Mounting pin

Claims (3)

A first heat insulating material disposed between the base placed on the foundation and the large fork adjacent to the base, and between the adjacent large forks;
The upper surface is disposed on the lower surface of the first heat insulating material, is disposed on the lower surface of the large pull, and the position of the lower surface is located above the position of the ventilation means provided on the base side. A second heat insulating material arranged as follows:
Fixing means fixed to the base and the fork respectively and supporting the second heat insulating material;
A floor insulation structure characterized by comprising:   2. The floor heat insulating structure according to claim 1, wherein the first heat insulating material has a cotton shape, and the second heat insulating material has a plate shape having a self-holding property. The fixing means includes
A vertical piece of length equal to the sum of the thickness of the first insulation and the thickness of the second insulation;
An upper piece connected to the upper end of the vertical piece, and placed on the base or the upper surface of the fork;
A lower piece connected to the lower end of the vertical piece and placing the lower surface of the second heat insulating material;
The floor heat insulating structure according to claim 1 or 2, characterized by comprising:

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