JP2010112125A - Foundation heat insulating structure, foundation heat insulating construction method, and sealing material for foundation heat insulation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foundation heat insulating structure, a foundation heat insulating construction method and a sealing material for foundation heat insulation attaining high heat insulation and high airtightness of a clearance between a sill and a foundation top plate of a building to attain field construction type high airtightness by a simpler and more inexpensive method. <P>SOLUTION: The sealing material is filled in the clearance between a foundation and the sill of the building. A waterproof sheet is interposed between the foundation and the sill. In a method for constructing the foundation heat insulating structure, the sealing material is filled in the clearance between the foundation and sill of the building. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a basic heat insulating structure in which a gap between a base of a building and a top of the foundation is airtight, a basic heat insulating construction method, and a sealing material for basic heat insulating.

  In recent years, in buildings such as houses, there are an increasing number of buildings such as houses adopting a foundation / base structure called basic heat insulation instead of conventional floor heat insulation for the purpose of energy saving. In the floor insulation, ventilation is provided by providing a vent on the foundation for ventilation under the floor. However, in the foundation insulation, the ventilation is not provided in the foundation, and the floor has an airtight insulation structure. Thus, what is called high heat insulation and high airtightness is achieved.

  In order to achieve high thermal insulation and high airtightness under the floor, a method has been proposed in which an airtight material using an elastic packing is disposed between the foundation and the base (Patent Document 1). In addition, there have been proposed one using an airtight spacer (Patent Document 2), one using an airtight holding material (Patent Document 3), and the like.

  However, in order to use these hermetic materials, it is necessary to prepare the hermetic material in advance, and the production cost is also increased. As a result, the construction material cost is increased. In addition, since it is necessary to mount the base so that the airtight packing and the like do not shift, there is room for improvement in terms of workability.

Thus, as a result of intensive studies, the present inventors have succeeded in a technique for achieving high airtightness in a field construction type by a simpler and cheaper method, and completed the present invention.
JP 2006-118305 A JP 2006-274586 A JP 2003-301535 A

  The present invention has been made in view of the above-described problems of the prior art, and a basic heat insulating structure, a basic heat insulating construction method, and a sealing material for basic heat insulating, in which a gap between a base of a building and a base ceiling is highly thermally insulated and airtight. The purpose is to provide.

  The basic heat insulating structure of the present invention is characterized in that a sealing material is filled in a gap between a foundation and a foundation of a building. The foundation is a concrete foundation, and the type of foundation is not particularly limited, and any foundation can be used as long as it is used for a building such as a cloth foundation or a solid foundation. As the base, any material that is used for a building such as a house such as wood (corner) or steel frame can be used.

  Here, the sealing material in the present specification refers to a building sealing material defined in JIS A5758, and means a liquid sealing material.

  The sealing material only needs to be configured to fill a gap between the top edge of the building foundation and the bottom surface of the foundation, so that the sealing material is sealed between the top edge of the building foundation and the bottom surface of the foundation. A material may be sandwiched, or a structure in which a sealing material is filled from the side into the gap between the top edge of the foundation of the building and the bottom surface of the foundation may be employed.

  When the sealing material is filled into the gap from the side, it is preferable that the sealing material is filled in a corner portion formed by the top end of the foundation and the side wall surface of the foundation so as to have a triangular cross section (so-called triangulation).

  Moreover, it is preferable to interpose a waterproof sheet between the foundation and the base.

  Any waterproof sheet may be used as long as it has a waterproof effect. For example, a butyl rubber tape is preferably used.

  The foundation heat insulation construction method of the present invention is a method for constructing the foundation heat insulation structure, and is characterized in that a sealing material is filled in a gap between a foundation of a building and a foundation.

  Since the sealing material may be constructed so as to fill a gap between the top of the building foundation and the bottom of the foundation, the sealing material is sealed between the top of the building foundation and the bottom of the foundation. You may construct so that a material may be pinched | interposed and you may construct so that the sealing material may be filled from the side into the clearance gap between the top edge of the foundation of a building, and the bottom face of a foundation. In filling the sealing material, the sealing material may be extruded using an extrusion type cartridge gun, or the film pack in which the sealing material is sealed may be extruded using an extrusion type cartridge gun. Alternatively, the front end of the film pack in which the sealing material is sealed may be cut and squeezed out by hand.

  When filling the gap with the sealing material from the side, it is preferable to fill the corner portion formed by the top end of the foundation and the side wall surface of the foundation so that the sealing material has a triangular cross-section (so-called triangular punching). At this time, if the cross-sectional triangle shape does not become good, use a spatula or the like to make the cross-sectional triangle shape.

  Moreover, it is preferable to interpose a waterproof sheet between the foundation and the foundation to prevent the foundation from being corroded by moisture from the concrete foundation. As described above, the waterproof sheet is not particularly limited as long as it has a waterproof effect. For example, a butyl rubber tape is preferably used. As a method of interposing a waterproof sheet between the foundation and the foundation, a waterproof sheet may be attached to the top end of the foundation, or it may be constructed so as to be attached to the bottom surface of the foundation.

  As a sealing material for basic thermal insulation used in the basic thermal insulation structure or the basic thermal insulation construction method, a terminal containing polytetramethylene glycol and / or a polyol containing modified polytetramethylene glycol and a polyisocyanate compound is reacted. It is preferable to contain a urethane prepolymer having an isocyanate group.

  It is preferable that the polyol further contains a polyester polyol and / or a hydroxyl group-containing liquid diene polymer. The sealing material for basic heat insulation preferably has an SVI value of 2 or more and 8 or less.

  The sealing material for basic heat insulation preferably further contains a curing catalyst.

  The sealing material for basic heat insulation preferably further contains a thixotropic agent.

  According to the basic thermal insulation structure and the basic thermal insulation construction method according to the present invention, the gap between the base of the building and the top of the foundation can be highly insulated and highly airtight by a simpler and less expensive method. Has an effect.

  In addition, according to the sealing material for basic heat insulation according to the present invention, since it is a one-component room temperature curing type without using an organic solvent, there is no problem in terms of environment and safety, and it is excellent in workability. It has a remarkable effect that it is excellent in.

  Embodiments of the present invention will be described below, but these are exemplarily shown, and it goes without saying that various modifications are possible without departing from the technical idea of the present invention.

  The sealing material for basic heat insulation according to the present invention is a one-component moisture curable composition containing, as a main component, a urethane prepolymer having an isocyanate group at a terminal obtained by reacting a polyol and a polyisocyanate compound, The polyol contains one or more selected from the group consisting of polytetramethylene glycol and modified polytetramethylene glycol.

  The total amount of the polytetramethylene glycol and the modified polytetramethylene glycol is preferably 10% by mass or more, and more preferably 30% by mass or more based on the total polyol. Only one of the polytetramethylene glycol and the modified polytetramethylene glycol may be used or may be used in combination, but it is more preferable to use the modified polytetramethylene glycol from the viewpoint of workability.

  As the polytetramethylene glycol, known tetrahydrofuran polymers can be widely used. The molecular weight of the polytetramethylene glycol is not particularly limited, but it is preferable to use one having a number average molecular weight in the range of 500 to 5,000, more preferably in the range of 500 to 2,000. The polytetramethylene glycol may be used alone or in combination of two or more.

  The modified polytetramethylene glycol is a copolymer of tetramethylene ether and alkylene ether, and the alkylene ether preferably has a side chain. Examples of the modified polytetramethylene glycol include a copolymer of tetrahydrofuran and an alkyl-substituted tetrahydrofuran, a copolymer of tetrahydrofuran and an alkylene oxide, a copolymer of tetrahydrofuran and an alkylene ether having a side chain, and the like. Suitable examples of the copolymer of tetrahydrofuran and alkyl-substituted tetrahydrofuran include, for example, a copolymer of tetrahydrofuran and 3-alkyltetrahydrofuran described in JP-A No. 63-235320.

  The molecular weight of the modified polytetramethylene glycol is not particularly limited, but it is preferable to use a number average molecular weight in the range of 500 to 5000, more preferably 1000 to 3000. The modified polytetramethylene glycol may be used alone or in combination of two or more.

In the sealing material for basic heat insulation of the present invention, a polyol other than the polytetramethylene glycol and the modified polytetramethylene glycol may be blended as a polyol component. The polyol may be any active hydrogen-containing compound having two or more active hydrogen groups, and is not particularly limited. For example, other polyether polyols such as trifunctional or higher polyhydric alcohols and diols, polypropylene glycol (PPG), Examples include polyester polyols, polybutadiene polyols, polyisoprene polyols, polyolefin polyols, polycarbonate polyols, polymer polyols, polycaprolactone polyols, and polyacrylic ester polyols. These polyols may be used alone or in combination of two or more. May be.
In particular, in order to improve the adhesion to rubber and the like, a polyester diol obtained by reaction of a polyvalent carboxylic acid and a polyol, or a liquid diene polymer containing a hydroxyl group such as polybutadiene polyol and polyisoprene polyol is used as the total polyol component. It is suitable to mix | blend 1-50 mass% with respect to it, Preferably 5-30 mass%.

  More specifically, examples of the polyether polyol include diols such as ethylene glycol, propylene glycol and butylene glycol, triols such as glycerin and trimethylolpropane, and one or two amines such as ammonia and ethylenediamine. Examples include polyether polyols such as random or block copolymers obtained by ring-opening polymerization of propylene oxide and / or ethylene oxide in the presence of more than one species. Polyester polyol is obtained by polycondensation of polyvalent carboxylic acids such as adipic acid, sebacic acid and terephthalic acid in the presence of polyhydric alcohols such as ethylene glycol, propylene glycol, 1,4 butanediol and neopentyl glycol. Other examples include low-molecular active hydrogen compounds having two or more active hydrogen groups such as bisphenol A and ramester of castor oil. As the above compound, those having a molecular weight of usually 100 to 7000 and 2 to 4 OH groups in one molecule can be preferably used.

  The polyisocyanate compound is not particularly limited. For example, aromatic polyisocyanates such as diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TDI), xylene diisocyanate (XDI), naphthalene diisocyanate, and hexamethylene diisocyanate (HDI). ), Aliphatic polyisocyanates such as lysine methyl ester diisocyanate, and alicyclic polyisocyanates such as hydrogenated diphenylmethane diisocyanate, isophorone diisocyanate, norbornane diisocyanate, and hydrogenated tolylene diisocyanate. As the isocyanate compound, MDI is preferable from the viewpoint of cost and reactivity, but XDI is preferable in consideration of discoloration such as yellowing.

A method for reacting the polyol component and the polyisocyanate compound is not particularly limited, and a known method can be used. Specifically, a polyol component having two or more hydroxyl groups (OH) and a polyisocyanate compound having two or more isocyanate groups (NCO) are used so that the isocyanate groups become excessive, that is, the NCO / OH equivalent ratio is 1 By making it react so that it may become larger, the urethane prepolymer which has an isocyanate group at the terminal is obtained.
The reaction conditions are not particularly limited. For example, the NCO / OH equivalent ratio is 1.3 to 10.0, more preferably 1.5 to 5.0, in a nitrogen or dry air stream. It is produced by reacting at ~ 100 ° C for several hours. When the NCO / OH equivalent ratio is less than 1.3, the viscosity of the prepolymer becomes high, resulting in a problem in workability.

The sealing material for basic heat insulation of the present invention preferably further contains a curing catalyst. The curing catalyst is a catalyst for promoting curing of the urethane prepolymer, and examples thereof include organometallic compounds and amines.
The blending ratio of the curing catalyst is not particularly limited, but is preferably 0.01 to 10 parts by mass, more preferably 0.01 to 2 parts by mass with respect to 100 parts by mass of the urethane prepolymer.

  Examples of the organometallic compound include divalent organic tin compounds such as tin octylate and tin naphthenate; dibutyltin dioctate, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dimaleate, dibutyltin distearate, dioctyltin dilaurate, Tetravalent organic tin compounds such as dioctyltin diversate, dibutyltin oxide, dibutyltin bis (triethoxysilicate), a reaction product of dibutyltin oxide and phthalate; organic acid lead salts such as lead octylate and lead naphthenate Titanates such as tetra-n-butyl titanate and tetrapropyl titanate; organic bismuth compounds such as bismuth octylate, bismuth neodecanoate and bismuth rosinate; organic zirconium compounds such as zirconium octylate; Organic cobalt compounds; organic zinc compounds; organic manganese compounds; organic iron compounds; tin-based chelate compounds such as dibutyltin bis (acetylacetonate), zirconium tetrakis (acetylacetonate), titanium tetrakis (acetylacetonate), Examples thereof include chelate compounds of various metals such as aluminum tris (acetylacetonate), aluminum tris (ethylacetoacetate), acetylacetone cobalt, acetylacetone iron, acetylacetone copper, acetylacetone magnesium, acetylacetone bismuth, acetylacetone nickel, acetylacetone zinc, and acetylacetone manganese. Of these, organic tin compounds and metal chelate compounds are preferred, and tin-based chelate compounds are more preferred because of their high reaction rate and relatively low toxicity and volatility.

  Examples of the amines include primary amines such as butylamine and octylamine, secondary amines such as dibutylamine and dioctylamine, alkanolamines such as monoethanolamine, diethanolamine and triethanolamine, diethylenetriamine, Examples include primary amines such as triethylenetetramine, tertiary amines such as triethylamine, tributylamine, triethylenediamine, and N-ethylmorpholine, or salts of these amines and carboxylic acids. .

  Moreover, you may mix | blend latent hardeners, such as a compound which produces | generates an amine by a hydrolysis, with the said sealing material for basic heat insulation. Preferred examples of the compound that generates an amine by hydrolysis include dehydration reaction products of amines such as ketimine compounds, enamine compounds, and aldimine compounds, and carbonyl compounds, and are reaction products of polyamines and aldehydes. Some polyaldimines are more preferred. By using the latent curing agent, the low-temperature curability can be improved and the workability in winter can be further enhanced. Furthermore, the use of a latent curing agent also has an effect of suppressing foaming.

  The blending ratio of the latent curing agent is not particularly limited, but when using a compound such as polyaldimine that hydrolyzes to produce amines, it is included in the number of amino groups of amines produced by hydrolysis and the urethane prepolymer. It is desirable that the ratio of the number of isocyanate groups to be produced is 0.1 to 1.0, more preferably 0.2 to 0.6.

When a latent curing agent such as polyaldimine is blended in the sealing material for basic heat insulation, it is preferable to further blend a compound that promotes hydrolysis of the latent curing agent. As a compound which accelerates | stimulates this hydrolysis, a hydrolysable SL compound, p-toluenesulfonyl isocyanate, etc. are mentioned, for example. These compounds can be used alone or in combination of two or more. When two or more types are used in combination, the combination is not particularly limited, and for example, a hydrolyzable ester compound and p-toluenesulfonyl isocyanate may be used in combination.
The hydrolyzable ester compound is hydrolyzed with water to produce a free acid and promotes hydrolysis of aldimine. For example, esters such as methyl formate, orthoformate such as methyl orthoformate and ethyl orthoformate Acetals such as esters and cyclohexanone dimethyl acetal are preferred in terms of storage stability.

The sealing material for basic heat insulation of the present invention preferably has a structural viscosity index (SVI value: Structural Viscosity Index, hereinafter referred to as SVI value) of 2 or more from the viewpoint of workability during construction. More preferably. The upper limit of the SVI value is not particularly limited, but is preferably 8 or less. In the present invention, the SVI value means a numerical value calculated by the following method. First, in accordance with 6.3 viscosity of JIS K 6833, using a B-type viscometer (manufactured by Toki Sangyo, BS rotor No. 7), the viscosity after 120 seconds at 1 rotation and 10 rotations Measure (measurement temperature 23 ° C.). From the measured viscosity, an SVI value is calculated by the following formula (1).
S = η ₁ / η ₂ (1)
In the formula (1), S: SVI value, η ₁ : viscosity at 1 rotation, η ₂ : viscosity at 10 rotations.

  The method for improving the SVI value is not particularly limited, but it is preferable to improve the SVI value by adding a thixotropic agent. As the thixotropic agent, for example, various kinds of materials such as surface-treated calcium carbonate, fine powder silica, and fatty acid amide can be used. The mixing ratio of the thixotropic agent is not particularly limited, but it is preferable to select and mix appropriately so that the SVI value of the sealing material for basic heat insulation of the present invention is 2 or more.

  In addition to the above components, the sealing material for basic heat insulation of the present invention includes, as necessary, a filler, a plasticizer, a colorant, a discoloration inhibitor, an adhesion-imparting agent, a physical property modifier, a release agent, a lubricant, and a dehydration agent. Various additives such as additives (storage stability improvers), tackifiers, sag-preventing agents, ultraviolet absorbers, antioxidants, flame retardants, radical polymerization initiators, diluents such as high-boiling solvents, etc. Good. The colorant may be appropriately selected from dyes and pigments corresponding to the color of the foundation or foundation.

  Examples of the filler include organic or inorganic materials of various shapes, such as calcium carbonate, magnesium carbonate, and zinc carbonate; carbon black; clay; talc; fumed silica, calcined silica, precipitated silica, pulverized silica, and fused silica. Kaolin; diatomaceous earth; zeolite; titanium oxide, quicklime, iron oxide, zinc oxide, barium oxide, magnesium oxide; aluminum sulfate; vinyl chloride paste resin; glass balloon, shirasu balloon, saran balloon, phenol balloon, vinylidene chloride resin balloon Inorganic balloons, organic balloons, etc .; or these fatty acids, fatty acid ester-treated products, and the like can be mentioned, and these can be used alone or in combination. As the filler, it is preferable to use fine powder silica in order to increase transparency. Moreover, it is preferable to use inorganic hollow fillers, such as a glass balloon and a silica balloon, and organic hollow fillers, such as a polyvinylidene fluoride and a polyvinylidene fluoride copolymer. By using the hollow filler, the sealing material for basic heat insulation of the present invention can be reduced in weight. In particular, from the viewpoint of maintaining the flexibility of the cured product, for example, an organic hollow filler such as MFL-80GCA (manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) is suitable.

  Examples of the plasticizer include dioctyl phthalate (DOP), dibutyl phthalate (DBP), dilauryl phthalate (DLP), butyl benzyl phthalate (BBP), dioctyl adipate, diisononyl phthalate, diisodecyl adipate, diisodecyl phthalate, and trioctyl phosphate. , Tris (chloroethyl) phosphate, tris (dichloropropyl) phosphate, propylene glycol adipate polyester, butylene glycol adipate polyester, alkyl epoxy stearate, epoxidized soybean oil, etc., used alone or in combination Can do.

  The sealing material for basic heat insulation of the present invention is a one-component system and hardens at room temperature due to moisture in the air. Therefore, the gap between the base of the building and the top of the foundation is easily insulated with high heat and air tightness. There is an advantage that can be made.

  The present invention will be described more specifically with reference to the following examples. However, it is needless to say that these examples are shown by way of illustration and should not be construed in a limited manner.

(Synthesis Examples 1 to 11) Synthesis of Prepolymers A to K The compositions of the prepolymers are shown in Tables 1 and 2. After adding a predetermined amount of a polyol component to a stirrer equipped with a thermometer and dehydrating, a predetermined amount of an isocyanate component was added and reacted at 70 to 90 ° C. for 5 hours in a nitrogen atmosphere to obtain urethane prepolymers A to K. . The terminal isocyanate contents of the obtained urethane prepolymer are shown in Tables 1 and 2 together.

The compounding amounts of the compounding substances in Tables 1 and 2 are expressed in parts by mass, and * 1 to 10 are as follows.
* 1) Modified polytetramethylene glycol: manufactured by Hodogaya Chemical Co., Ltd., trade name PTG-L2000, a chain diol composed of a random copolymer of tetramethylene ether and a modified tetramethylene ether having a side chain, molecular weight 2000 .
* 2) Modified polytetramethylene glycol: manufactured by Asahi Kasei Co., Ltd., trade name PTXG-1800, a chain diol composed of a random copolymer of tetramethylene ether and neopentyl glycol, molecular weight 1800.
* 3) Polytetramethylene glycol: manufactured by Hodogaya Chemical Co., Ltd., trade name PTG-2000, molecular weight 2000.
* 4) Polypropylene glycol: manufactured by Mitsui Chemicals Polyurethane Co., Ltd., trade name Actol P-23, molecular weight 3000, bifunctional.
* 5) Polyester polyol: Kuraray Co., Ltd., trade name Kuraray polyol P-2010, adipic acid polyester polyol.
* 6) Polybutadiene glycol: Nippon Soda Co., Ltd., trade name NISSO PB G-1000.
* 7) XDI: xylylene diisocyanate * 8) MDI: 4,4'-diphenylmethane diisocyanate * 9) Polypropylene glycol: manufactured by Mitsui Chemicals Polyurethane Co., Ltd., trade name Actol Diol 2000, molecular weight 2000, bifunctional.
* 10) Polypropylene glycol: manufactured by Mitsui Chemicals Polyurethane Co., Ltd., trade name Actol 79-56, molecular weight 3000, trifunctional.

(Examples 1-8 and Experimental Examples 1-3)
In the formulation shown in Table 3, after stirring and mixing the urethane prepolymer and thixotropic agent at room temperature under a nitrogen stream, a curing catalyst is added and stirring and mixing is performed at room temperature under a nitrogen stream to obtain a one-part moisture-curing sealant. Obtained.

The compounding amounts of the compounding substances in Table 3 are shown in parts by mass, and * 11 to 23 are as follows.
* 11-21) Urethane prepolymers A to K: The urethane prepolymers obtained in Synthesis Examples 1 to 11.
* 22) Thixotropic agent: Nippon Aerosil Co., Ltd., trade name Aerosil RY200S, fumed silica.
* 23) Curing catalyst: Sansha Kikai Co., Ltd., trade name STANN BL, dioctyltin diversate.

  The following tests were performed on the obtained one-component moisture-curing sealant. The results are shown in Table 4.

1. Measurement of SVI value In accordance with 6.3 viscosity of JIS K 6833, using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., BS rotor No. 7), after 120 seconds at 1 rotation and 10 rotations The viscosity was measured (measurement temperature: 23 ° C.), and the SVI value was calculated by the following formula (1).
S = η ₁ / η ₂ (1)
In the formula (1), S: SVI value, η ₁ : viscosity at 1 rotation, η ₂ : viscosity at 10 rotations.

2. Hardness measurement Based on JIS S5050, the JIS A hardness was measured with respect to the hardened | cured material of 23 degreeC50% RH 7 days after the said 1 liquid moisture hardening type sealing material.

  As shown in Table 4, the cured products of the sealing materials of Examples 1 to 8 achieved a hardness of 60 or more and had excellent hardness.

  In addition, regarding the one-component moisture-curing type sealing material (urethane type) of Example 4, “5.6 Adhesion test after repeated expansion / reduction” described in JIS A 1439: 2004 “Testing method for sealing material for building”. An adhesion test was performed based on this. As the adherend, the mortar plate specified in 5.3.1) was used, and as the test body, the ISO type test body described in FIG. 7 of 5.3.2) was used. The test was basically performed according to 5.6), the repetition rate was 5 times / minute, the enlargement / reduction rate was ± 40%, and the number of cycles was 5000. A silicone sealant (Cemedine 8060; manufactured by Cemedine Co., Ltd.) was used as Experimental Example 4, and a modified silicone sealant (Cemedine POS seal; manufactured by Cemedine Co., Ltd.) was used as Experimental Example 5 to perform an adhesion test.

  As a result of the adhesion test, cracks were observed in both the silicone sealant of Experimental Example 4 and the modified silicone sealant of Experimental Example 5. On the other hand, only the urethane-based sealing material of Example 4 was observed with no cracks, and was found to be excellent in repeated fatigue resistance.

  Next, an embodiment of the basic heat insulating structure of the present invention in which the one-component moisture-curing sealing material of Example 4 is used as a sealing material for basic heat insulating will be described below.

  In FIG. 1, the code | symbol 10A shows the basic heat insulation structure of this invention. 10 A of foundation heat insulation structures are filled with the sealing material 20 in the clearance gap between the top end 14 of the concrete foundation 12 of a building, and the bottom face 18 of the base 16. As shown in FIG. The top end 14 of the concrete foundation 12 was mortar finished. Reference numeral 22 denotes a heat insulating material attached to the wall material 24 or the outer wall of the foundation 12, and an exterior material 26 is further attached to the outside of the heat insulating material 22.

  In addition, the code | symbol 28 shows a floor group, 30 shows soil concrete, 32 shows the ground, respectively. In addition, although the example of cloth foundation was shown in the example of illustration, there is no special limitation in the kind of foundation, and it is needless to say that any foundation can be applied as long as it is used for buildings such as cloth foundation and solid foundation. . In the example shown in the figure, the foundation structure is a residential one. Moreover, since the general structure of these foundations is well-known, detailed description is abbreviate | omitted.

  In FIG. 1, a waterproof sheet 34 is further attached to the top end 14 of the foundation 12. In the illustrated example, a butyl rubber tape is used as the waterproof sheet 34. In the illustrated example, the waterproof sheet 34 is attached to the top end 14 of the foundation 12. However, in order to prevent the foundation 16 from being corroded by moisture from the concrete foundation 12, the foundation 12 is interposed between the foundation 12 and the foundation 16. Since the waterproof sheet 34 may be interposed, the waterproof sheet 34 may be attached to the bottom surface 18 of the base 16.

  Next, the basic heat insulation construction method of the present invention will be described based on FIGS.

  The basic heat insulation construction method of the present invention is a method for constructing the above-described basic heat insulation structure 10 </ b> A, and the sealing material 20 is filled in the gap between the foundation 12 and the base 16.

  In the example of illustration, it was set as the basic heat insulation construction method of inner basic heat insulation. First, the heat insulating material 22 is attached to the foundation 12 in which the anchor bolts 36 are embedded, and the mortar finish is performed to prepare the base 16 (in the illustrated example, a wood square material treated with an antiseptic).

  Then, a waterproof sheet 34 (butyl rubber tape in the illustrated example) is prepared and affixed to the top end 14 of the foundation 12 according to the width of the base 16.

  Next, the sealing material 20 of Example 4 is extruded onto the waterproof sheet 34 so as to be in the center of the width of the base 16 and applied with a cartridge gun (FIG. 3). In addition, although the example which stuck the waterproof sheet 34 on the top end 14 of the foundation 12 was shown, in order to prevent the base 16 corroding with the water | moisture content from the concrete foundation 12, the waterproof sheet 34 is provided between the foundation 12 and the base 16. Since it suffices to intervene, it may be constructed so as to be attached to the bottom surface 18 of the base 16.

  Then, the base 16 is fastened to the anchor bolt 36 (FIG. 3). In this way, the basic heat insulating structure 10A in which the gap between the base 16 of the building and the top end 14 of the foundation 12 is highly heat-insulated and air-tight is obtained.

  Moreover, since the sealing material 20 should just be comprised so that the clearance gap between the top end 14 of the foundation 12 of a building and the bottom face 18 of the base 16 may be filled, the top end 14 of the foundation 12 of a building is sufficient. The sealing material 20 may be sandwiched between the base 16 and the bottom surface 18 of the base 16, or the gap between the top end 14 of the building foundation 12 and the bottom surface 18 of the base 16 is filled with the sealing material 20 from the side. It may be a structure.

  That is, as shown in FIG. 4, the sealing material 20 is filled in a corner portion formed by the top end 14 of the foundation 12 and the side wall surface 38 of the base 16 so as to have a triangular cross section (so-called triangular driving). You can also. In this way, the basic heat insulating structure 10B is obtained.

  Next, the results of a room space hermetic performance test are shown below.

  Applying the sealing material for basic thermal insulation of Example 4 described above onto a concrete block having a thickness of 150 mm × length of 380 × height of 200 mm, placing a base (square material) of 120 mm × 120 mm and fixing with an anchor bolt, a total width of 910 mm X A model for evaluation having a total length of 3800 mm was produced, and this was designated as Example 9.

  Comparative Example 1 was the same as Example 9 except that the sealing material for basic heat insulation was not filled. In addition, a comparative example is the same as that of Example 9 except that a foundation-base airtight packing (trade name: top end list) manufactured by Nippon Sumikyo Co., Ltd. is used instead of the sealing material for basic insulation. 2.

  The airtight performance test of the room space for the evaluation models of Example 9 and Comparative Examples 1 and 2 described above was measured by the reduced pressure method using an airtightness measuring device (trade name: Dr. Dolphin manufactured by EOM). The test was performed under the conditions of wind speed: 0 m, room temperature: 30 ° C., wind direction: 0, and outside air temperature: 33 ° C.

  As shown in Table 5, it has been found that the sealing material for basic heat insulation of the present invention improves the workability while having excellent airtightness performance equivalent to that of the airtight packing. Moreover, it turned out that cost is reduced compared with the conventional one.

It is a schematic principal part sectional drawing which shows one embodiment of the basic heat insulation structure of this invention. In the basic heat insulation construction method of this invention, it is a schematic perspective view which shows the state before attaching a foundation. In the basic heat insulation construction method of this invention, it is a schematic perspective view which shows the state after attaching a base. It is a schematic principal part sectional drawing which shows another embodiment of the basic heat insulation structure of this invention.

Explanation of symbols

  10A, 10B: Basic heat insulating structure of the present invention, 12: foundation, 14: top edge of foundation, 16: base, 18: bottom surface of base, 20: sealing material, 22: heat insulating material, 24: wall material, 26: exterior Material: 28: floor assembly, 30: soil concrete, 32: ground, 34: waterproof sheet, 36: anchor bolt, 38: side wall surface.

Claims (5)

  A basic heat insulating structure characterized in that a sealing material is filled in a gap between a foundation and a foundation of a building.   The foundation heat insulating structure according to claim 1, wherein a waterproof sheet is interposed between the foundation and the base.   A method for constructing a foundation heat insulation structure according to claim 1 or 2, wherein a sealing material is filled in a gap between a foundation and a foundation of a building.   4. The foundation heat insulation construction method according to claim 3, wherein a waterproof sheet is interposed between the foundation and the foundation. A sealing material used in the basic heat insulating structure according to claim 1 or 2, or the basic heat insulating construction method according to claim 3 or 4,
A sealing material for basic insulation, comprising a urethane prepolymer having an isocyanate group at a terminal obtained by reacting a polyol containing polytetramethylene glycol and / or modified polytetramethylene glycol with a polyisocyanate compound.

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