JP2781675B2 - Airtight structure between foundation and structural members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtight structure between a foundation and a structural member, which is used when airtightly joining the foundation and the structural member.

[0002]

BACKGROUND OF THE INVENTION To build the foundation of a building, especially a house,
Generally, a construction method is adopted in which a cloth foundation is first constructed, a base ring is laid on the upper end surface of the cloth foundation, and then structural members such as floor members and frame members are laid on the cloth foundation via the base ring.
In such a construction, it is usual to provide a ventilation opening communicating with the outside on the cloth foundation for ventilation under the floor.

By the way, as described above, in the related art, since ventilation is usually performed under the floor, it is natural that no consideration is given to airtightness between the cloth base and the pedestal and between the pedestal and the structural member. . However, in recent years, with the improvement of building construction technology and the development of heat insulating structural materials, construction of buildings with high airtightness and high heat insulation has been performed, and in conjunction with this, the development of various air conditioning equipment As a result, the heat retention and cooling / heating efficiency of buildings have come to be considered. Against this background, airtightness between the foundation and the structural members such as floor members, frame members and the like, especially around bathrooms, entrances, basements, etc., has been required.

That is, in a bathroom, the floor where a bath unit is usually disposed in the bathroom is designed to be one step lower, whereby the floor serves as a thermal bridge with the underfloor space, and the bathroom is cooled and the bathroom is cooled. The heat retention inside is impaired,
This is because the comfort is reduced. Also, at the entrance, the floor is designed to be one step lower than the normal floor so that the floor is in contact with or close to the ground, whereby the joint between the fabric foundation and the structural member is located above the floor. This is because if outside air enters through the gap between the joints, the cooling and heating efficiency of the entire building is reduced.

[0005]

However, although there is a demand for hermeticity between the foundation and the structural member for such a reason, as described above, sufficient hermeticity is simply achieved in the construction using the conventional wheel. I can't. Therefore, it is conceivable to achieve airtightness by using an adhesive, but a vinyl acetate emulsion adhesive that is usually used for bonding between building members,
With rubber-based adhesives, epoxy adhesives, etc., even if these are used, the adhered surface of the upper end surface of the fabric base or the lower end surface of the structural member may not be smooth, and when these members are joined via a pedestal, Since the members are rubbed and the adhesive layer is thinned, a gap is formed between the members after bonding, and a desired airtightness cannot be sufficiently obtained.

It is also conceivable to use a urethane resin, which is mainly used for a heat insulating material, as an adhesive in place of the above-mentioned adhesive. In this case, however, the resin foams immediately upon discharge from a closed container. When the members are joined together, the foamed adhesive is scraped off,
The effect of filling gaps between members is significantly lost, and sufficient airtightness cannot be obtained.

The present invention has been made in view of the above circumstances, and has as its object to improve the heat retention and cooling / heating efficiency of a building and to improve the comfort, particularly in the foundation around a bathroom, an entrance, and a basement. -To provide an airtight structure between a foundation and a structural member capable of achieving high airtightness between the structural members.

[0008]

Means for Solving the Problems The present inventor has made intensive studies to solve the above-mentioned problems, and as a result, has been replaced with a conventional adhesive, a one-component type foamed and hardened by moisture in the air or a member to be bonded. If you use a moisture-curable urethane foam adhesive,
The present inventors have found that it is possible to provide a structure between a foundation and a structural member having excellent airtightness, and have completed the present invention. That is, the basis of the present invention
And the air-tight structure between the structural member, the architrave, the or in the air
A one-component moisture-curable urethane adhesive that foams and cures due to the moisture in the adhesive member between the fabric base and structural members
The fact that these were adhered to these in a state where the voids were filled was defined as a means for solving the above problem.

[0009]

According to the hermetic structure between the foundation and the structural member of the present invention, the one-component moisture-curable urethane adhesive can be used in the atmosphere or in the air.
It reacts with the moisture in the adhesive member and hardens and expands, so that the gap between the base and the base wheel and between the base wheel and the structural member is reliably filled, and the gap between the base and the structural member Airtightness is obtained.

[0010]

FIG. 1 shows an embodiment in which the airtight structure of the present invention is applied to the structure between base floors around a bathroom A shown in FIG. 2, and reference numeral 1 in the figure denotes a cloth foundation. . This cloth foundation 1
Is made of cast concrete or precast concrete, and has an anchor bolt 2 protruding from the upper end surface thereof. On the upper end surface of the cloth base 1, a thin plate-shaped base 3 made of a resin such as vinyl chloride is laid via a mortar 4. This wheel 3
Is formed by hanging water drainage pieces 5 and 5 obliquely downward on both sides and forming a hole (not shown) for an anchor bolt in the center portion, and this hole is inserted through the anchor bolt 2. It is.

The undercarriage 3 is air-tightly adhered and fixed on the cloth base 1 via an adhesive layer 6. The adhesive layer 6 is formed of a one-component moisture-curable urethane adhesive that foams and cures with moisture. This one-component moisture-curable urethane adhesive (hereinafter abbreviated as urethane adhesive).
Contains a urethane prepolymer as a main component, and a surfactant of 0 to 3 with respect to 100 parts by weight of the urethane prepolymer.
0 parts by weight, 0.5 to 500 parts of a thickener or a thixotropic agent
It is obtained by blending parts by weight. Here, the urethane polymer is obtained by reacting a polyol (polyhydroxy compound) such as a polyether polyol or a polyester polyol with an excess of a polyisocyanate compound, and contains 1% by weight or more of an active isocyanate group at a molecular terminal. Things. (Hereinafter, this urethane prepolymer is referred to as an NCO group-containing urethane prepolymer.) Further, the surfactant is for uniformly foaming the NCO group-containing urethane prepolymer or for increasing the expansion ratio, and a thickener. (Or thixotropic agent) is for imparting thixotropic properties so that the resulting foamed adhesive does not run down when applied to the vertical surface of the member to be bonded.

The urethane adhesive having such a composition generates carbon dioxide gas when its active isocyanate group (hereinafter referred to as NCO group) reacts with moisture (moisture) in the air or moisture in the member to be bonded. It expands and expands the apparent volume by the expansion, and the expansion due to the expansion starts to be seen in about 30 minutes after the reaction is started by contact with moisture, and is almost finished after about one day has passed. The composition was adjusted. In addition, this urethane adhesive has a foaming ratio at the time of reaction of 1.
The composition is adjusted so as to be 3 to 5 times, preferably 1.5 to 3 times. Here, the reason why the expansion ratio was set to 1.3 to 5 times is that if the expansion ratio is less than 1.3 times, the
When bonding between the base ring 3 and the floor panel as described later, and further between the base ring 3 and the floor panel, the effect of filling the voids between the members due to foaming expansion is not sufficient. This is because the adhesive strength between them decreases, and the amount of the adhesive protruding from the joint surface increases, resulting in inconvenience such that the workability deteriorates. In order to obtain the expansion ratio of 1.3 to 5 times, the NCO group content in the urethane adhesive needs to be 1% by weight or more.

Examples of the polyol used for synthesizing the NCO group-containing urethane prepolymer include polyoxyethylene polyol, polyoxypropylene polyol, random or block copolymer polyoxyethylene-propylene copolymer polyol, amine compound ( Polyols obtained by ring-opening polymerization of ethylene oxide or propylene oxide with methylamine, ethylamine, propylamine, ethylenediamine, propylenediamine, etc., polyether polyols such as polyoxytetramethylene glycol, dicarboxylic acids (adipic acid, succinic acid) , Maleic acid, phthalic acid, etc.) and glycols (ethylene glycol, propylene glycol, 1,4-butylene glycol, 1,6-hexanediol, neopentyl) And polyester polyols such as polybutylene adipate polyol, polyhexamethylene adipate polyol, and polylactone polyols, which are obtained by polycondensation with polylactone polyols, and usually have a molecular weight of 200 to 20,000. Are used alone or as a mixture. In addition, low molecular weight polyols and polyamines can of course be used, such as polyols such as ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, hexanediol, glycerin, trimethylolpropane, and ethylenediamine; Examples thereof include polyamines such as diphenylmethanediamine and m-phenylenediamine, which are used alone or as a mixture as described above.

The polyisocyanate compound used for the synthesis of the NCO group-containing urethane prepolymer includes, for example, tolylene diisocyanate (TDI),
4,4'-diphenylmethane diisocyanate (MD
I), polymethylene polyphenylene polyisocyanate (polymeric MDI), carbodiimide-modified MDI,
Aromatic polyisocyanates such as naphthalene diisocyanate and hexamethylene diisocyanate (HMD
I), trimethylhexamethylene diisocyanate (T
Aliphatic polyisocyanates such as MDI), isophorone diisocyanate (IPDI), 4,4'-
Dicyclohexylmethane diisocyanate (hydrogenated MD
And alicyclic polyisocyanates such as I).
These compounds are used alone or as a mixture thereof. More preferred polyisocyanate compounds are aromatic polyisocyanates, such as TDI or MDI.

Then, the NCO groups of the polyisocyanate compound are prepared and reacted so that the NCO groups of the polyisocyanate compound become excessive with respect to the hydroxyl groups of the polyol, so that the NCO group content of the adhesive as a whole becomes 1% by weight or more. Thus, an NCO group-containing urethane prepolymer used in the present invention can be obtained. Here, as described above, when the NCO group content is less than 1% by weight, the degree of foaming is reduced and the effect of filling the voids is reduced.

In such a urethane adhesive, a surfactant can be used to foam the adhesive uniformly or to increase the expansion ratio as described above. Examples of such a surfactant include a polysiloxane-polyoxyalkylene block copolymer,
Phenolic compounds to which ethylene oxide has been added; and the NCO group-containing urethane prepolymer 1
0 to 30 parts by weight, preferably 0.1 to 100 parts by weight
-10 parts by weight are added. Examples of the thickener (or thixotropic agent) include colloidal silica, finely powdered carbon black, fatty acid-treated calcium carbonate, castor oil derivatives, fatty acid amides and fatty acid metal soaps.
With respect to 100 parts by weight of the O-group-containing urethane prepolymer, 0.1 part by weight
5 to 500 parts by weight, preferably 1 to 200 parts by weight is blended.

The urethane adhesive may, of course, contain an inert solvent, a plasticizer, a filler, a curing accelerator, or other additives, if necessary. Here, the inert solvent is used for adjusting the viscosity, for example, ethyl acetate, ester solvents such as butyl acetate, cellosolve ester solvents such as cellosolve acetate, acetone, ketone solvents such as methyl ethyl ketone,
Solvents having no active hydrogen, such as aromatic hydrocarbon solvents such as benzene, toluene and xylene, and aliphatic or petroleum hydrocarbon solvents such as n-hexane and n-heptane are used.

The plasticizer is used for adjusting viscosity and physical properties after curing. For example, dioctyl adipate (DOA), dioctyl phthalate (DOP), dibutyl phthalate (DBP), tricresyl phosphate (TCP) ) And oligomer plasticizers such as polyesters and urethanized polyethers. Fillers are used as fillers or reinforcing agents.For example, inorganic fillers such as calcium carbonate, talc, clay, and carbon, organic fillers such as polyvinyl chloride fine powder, and microballoons such as shirasu balloons and glass microballoons are used. Is done.

The curing acceleration catalyst is used for controlling the curing speed of the adhesive, and a catalyst known in polyurethane chemistry can be used. For example, tin octylate, tin naphthenate, dibutyltin dilaurate, zinc octylate and the like can be used. Organic acids and metal salts such as Sn, Co, Ni, Fe, Zn, Pb,
Tertiary amines such as 1,4-diaza 2,2,2 bicyclooctane, triethylamine, N, N-dimethylcyclohexylamine, diaza-bicycloundecene, N, N-diethylbenzylamine, triethylenediamine, N-methylmorpholine Are used alone or as a mixture thereof.

Such a urethane adhesive is stably stored in a closed container without being cured. And
The urethane adhesive is applied to the upper end surface of the cloth base 1 and the base wheel 3 is placed thereon to bond the cloth base 1 and the base wheel 3 together. In addition, as a method of applying the urethane adhesive, a well-known method such as a method of applying the adhesive in a bead shape to a joint portion or a method of spreading with a spatula or the like is adopted. In addition, it goes without saying that the urethane adhesive may be applied in the same manner to the joint to be joined to the joint.

Further, a floor panel 7 and a semi-base 8 serving as structural members are laid on the cloth foundation 1 on which the base wheel 3 is laid. Here, an adhesive layer 6 made of the urethane resin is also formed between the floor panel 7 and the semi-base 8 and the pedestal 3, thereby forming the floor panel 7, the semi-base 8 and the pedestal 3. The space is airtightly joined.

A wall panel 9 is provided on the floor panel 7 and the semi-base 8, and is fastened to the anchor bolts 2 protruding from the cloth base 1 so that the cloth base 1 is fixed.
It is fixed to. Further, a foamed rubber sheet 10 made of an elastic material such as extruded polystyrene is attached to an inner surface (a surface under the floor) of the fabric base 1 to thereby provide heat insulation under the floor. It should be noted that the cloth foundation 1 and the independent foundation surrounding the underfloor space below the bathroom periphery A are naturally not provided with a ventilation opening, whereby the underfloor space is a closed space.

In forming such a structure, the undercarriage 3
In order to adhere the fabric base 1 to the floor panel 7 and the semi-base 8, the caulking gun G is used, for example, as shown in FIG. The urethane adhesive is applied in this manner, and then the base wheel 3 is placed on the upper end surface of the cloth base 1 with the anchor bolt 2 inserted through the hole. Next, a urethane adhesive is applied to the upper surface of the base wheel 3 in the same manner, and the floor panel 7 and the semi-base 8 are placed thereon. Then, the load of the floor panel 7 and the semi-base 8 is applied to the urethane resin, and the urethane resin is
And the base wheel 3 and between the base wheel 3 and the floor panel 7 and the semi-base 8. As time goes on, the urethane resin reacts with the moisture in the air or the moisture contained in the member to foam and expand, and starts to harden, and after about one day, the urethane resin expands and expands. Finish the curing. As a result, high airtightness is ensured by the urethane resin between the cloth foundation 1 and the pedestal 3 and between the pedestal 3 and the floor panel 7 and the semi-base 8.

In such a structure, the space between the cloth foundation 1 and the structural member composed of the floor panel 7 and the semi-base 8 is made highly airtight by the adhesive layer 6 made of urethane resin. In such a case, it is possible to prevent cool air from entering under the floor from these gaps, cooling the inside of the bathroom A through the floor around the bathroom A, and lowering the heat retention. Further, since the urethane adhesive is a one-component type, there is no need to mix the main agent and the curing agent as in the two-component type, so that the urethane adhesive is easy to use and does not cause poor bonding and poor foaming due to poor mixing. Furthermore, foaming expansion accompanying the curing reaction of the urethane adhesive starts about 30 minutes after application,
Since the process is completed in about 24 hours, the adhesive is not scraped off at the time of joining, so that the airtightness and the adhesive strength are not impaired. Further, since the time until the completion of curing is relatively short, there is no danger of delaying the construction period. .

FIG. 4 shows an embodiment in which the airtight structure between the base floors of the present invention is applied to the structure between the base floors around the entrance B shown in FIG. In this structure, a slab 11 made of cast concrete is joined to the side of the fabric foundation 1. The slab floor 11 is formed horizontally at a position lower than the other floor surfaces in the building with a step. In addition, the base wheel 3 is provided on the upper end surface of the cloth foundation 1.
An upward frame (frame material) 12 is provided via the. Here, similarly to the embodiment shown in FIG. 1, the base wheel 3 is air-tightly bonded to the cloth base 1 and the ascending frame 12 by an adhesive layer 6 made of urethane adhesive. The rising frame 12 is air-tightly joined.

Further, the inner surface of the cloth foundation 1 and the up frame 12,
Further, foamed rubber sheets 13, 14, 15 made of foamed polystyrene or the like are stuck on the upper surface of the interstitial floor 11, respectively, so that heat insulation from under the floor and from outside the cloth foundation 1 is achieved. A floor plate 16 is attached to the inner surface of the foam rubber sheet 14 and the upper surface of the foam rubber sheet 15 .

Even with such a structure, the adhesive layer 6
Is formed in the same manner as the method described with reference to FIG.
In this structure, it is possible to prevent the cooling air or the hot air from entering the entrance from the gap between the cloth foundation 1 and the ascending frame 12, thereby preventing the cooling and heating efficiency in the building from being lowered. In addition,
In the above embodiment, the structure of the present invention is shown in FIG.
Although an example in which the present invention is applied to the entrance area B is shown, it is needless to say that the present invention can be applied to a structure between a foundation and a structural member in the basement C.

[0028]

As described above, the hermetic structure between the foundation of the present invention and the structural member is such that the one-component moisture effect type urethane adhesive is cured by reacting with the moisture in the atmosphere and the member to be bonded. Because it expands together with the foam, the gap between the foundation and the undercarriage, and the space between the undercarriage and the structural member can be reliably filled , thereby securing high airtightness between the foundation and the structural member. In addition, it is possible to prevent inconvenience such that cold air or hot air enters under the floor or the building from the gap, thereby deteriorating the heat retaining property in the building and reducing the cooling / heating efficiency, and increasing the comfort in the building. .

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment in which an airtight structure between a foundation and a structural member of the present invention is applied around a bathroom.

FIG. 2 is a plan view showing a floor plan of a building to which the present invention is applied.

FIG. 3 is a perspective view for explaining a construction method of the structure of the present invention.

FIG. 4 is a side cross-sectional view showing one embodiment when an airtight structure between a foundation and a structural member of the present invention is applied around an entrance.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Cloth foundation 3 Wheel 6 Adhesive layer 7 Floor panel 8 Semi-base

Claims (1)

(57) [Claims] 1. A base ring is laid on an upper end surface of a cloth foundation, and a structural member such as a floor member or a frame member is disposed on the cloth base via the base ring. In the airtight structure, the base wheel is filled with a space between the fabric base and the structural member by a one-component moisture-curable urethane adhesive which foams and hardens due to moisture in the air or the member to be bonded.
Airtight structure between the foundation and the structural member, characterized by comprising adhered to et.