JP5695824B2 - Double floor structure and construction method thereof - Google Patents

Description

  The present invention relates to a double floor structure and a construction method thereof.

With the spread of OA equipment such as personal computers and LANs, the floor is made into a double floor type in places where many wirings are required such as offices, commercial facilities, factories, schools, etc., and wirings are stored in this space An “OA floor” is installed.
However, since the stored wiring becomes hot, there is a risk of fire due to electric leakage or the like. In addition, the air temperature at the place where the OA floor is installed is controlled so that the room temperature is constant, but the room temperature may rise as the wiring generates heat. In this case, energy for keeping the room temperature constant is also required. Furthermore, when the temperature difference between the space in the OA floor and the room is large, condensation may occur.
Further, when maintaining the stored wiring, it is also necessary for a person to walk on the inner floor surface of the OA floor.
Furthermore, in recent years, the floor is often made into a double floor form by renovation, and a material excellent in on-site workability is desired.

  For such a problem, Patent Document 1 discloses a fire prevention compartment in which a partition material is installed on the floor inside the OA floor, and a heat insulating / sound absorbing / fireproof covering material is interposed between the partition material and the OA floor floor material. A processing method is described. Patent Document 2 describes that as a double-floor heat insulating material, a material obtained by spraying phenol resin or melamine resin on mineral fibers such as rock wool and glass wool to bond and laminate the fibers is used. Yes.

JP 11-299914 A Japanese Utility Model Publication No. 6-54832

  However, if only the fire prevention compartments are installed at predetermined intervals as in Patent Document 1, heat insulation is not taken into account, and condensation may occur. In addition, in the event of a fire, the space may spread. On the other hand, when a heat insulating material like patent document 2 is used, there exists a possibility of damaging a heat insulation layer at the time of the maintenance of wiring.

  As a result of intensive studies to solve the above problems, the present inventor has found that in a double floor structure including a support and an upper floor on the support, a honeycomb core is formed on the substrate. The present inventors have completed the present invention by conceiving a double floor structure having a structure in which a honeycomb core structure in which a specific heat insulating composition is filled in the cell portion is laminated.

That is, the double floor structure of the present invention has the following characteristics.
1. On a substrate, in a double floor structure comprising a support and an upper floor on the support,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. 1. A double floor structure characterized in that a honeycomb core structure filled with a heat insulating composition containing ˜30 parts by weight is laminated. A support is erected on the base material,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. Laminating a honeycomb core structure filled with a heat insulating composition containing -30 parts by weight ;
2. A double floor construction method, wherein an upper floor surface is provided on the support. On a substrate, in a double floor structure comprising a support and an upper floor on the support,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. A honeycomb core structure filled with a heat insulating composition containing ˜30 parts by weight is laminated,
3. A double floor structure, wherein a non-combustible material is laminated on the upper part of the honeycomb core structure. A support is erected on the base material,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. Laminating a honeycomb core structure filled with a heat insulating composition containing -30 parts by weight ;
Laminating a non-combustible material on top of the honeycomb core structure,
A method for constructing a double floor, characterized in that an upper floor is provided on the support.

  The double floor structure of the present invention is a double floor structure comprising a support on a base material and an upper floor surface on the support, and has a specific heat insulating composition on the base material and in the cell portion of the honeycomb core. Has a structure in which honeycomb core structures filled with are laminated. In the present invention, by using such a double floor structure, it is excellent in fire resistance and can prevent condensation. Further, at the time of wiring maintenance, it is possible to exert strength that allows a person to walk on the inner floor surface of the OA floor.

It is structural drawing of this invention double floor structure. It is a figure which shows an example of this invention honeycomb structure. It is structural drawing of this invention double floor structure. It is a figure which shows an example of the construction method of this invention double floor structure.

  Hereinafter, the best mode for carrying out the present invention will be described.

  The double floor structure of the present invention is a double floor structure comprising a support on a base material and an upper floor surface on the support, and has a specific heat insulating composition on the base material and in the cell portion of the honeycomb core. Has a structure in which honeycomb core structures filled with (hereinafter also simply referred to as “honeycomb core structures”) are laminated.

FIG. 1 shows an example of the double floor structure of the present invention.
As a base material, if it is a general flooring, it will not specifically limit, For example, concrete, mortar, lightweight mortar, lightweight concrete, etc. are mentioned.
As shown in FIG. 1, a plurality of supports are erected on a base material. The shape, material, and the like are not particularly limited as long as a space is provided in consideration of providing wiring and the like and can stably support the upper floor surface. Moreover, what has a height adjustment function, what added the soundproofing (sound absorption) function, etc. can also be used.

As shown in FIG. 1, a honeycomb core structure is laminated on a base material. Examples of the honeycomb core of the present invention include a paper honeycomb core, a phenol-impregnated paper honeycomb core, an aluminum hydroxide-impregnated paper honeycomb core, a plastic honeycomb core, and a metal (for example, aluminum, stainless steel, titanium, etc.) honeycomb core. It is done. The shape of the cell portion is a square shape such as a square, a rectangle or a rhombus, a hexagonal shape, a circular shape, a rib shape, or the like, for example, various shapes defined in JIS A6931, and the object of the present invention can be achieved. Includes all materials and shapes. The honeycomb core may be used in a state where the folded shape is expanded or may be used in a shape that has been expanded in advance. In addition, it is preferable to appropriately set the size of the cell portion so that the compressive strength is 5 N / cm ² or more. If the cell size is too small, the heat insulating composition of the present invention may not be filled. If the cell size is too large, the strength may decrease. By using such a honeycomb core, it is possible to exert strength that allows a person to walk during wiring maintenance.

The heat-insulating composition filled in the cell part of the honeycomb core contains cement and foamed organic resin particles, and forms a heat-insulating layer in the cell part.
A cement is not specifically limited, A well-known thing or a commercial item can be used. For example, Portland cement such as ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, white Portland cement, alumina cement, super-hard cement, expanded cement, acidic phosphorus Examples thereof include acid salt cement, silica cement, blast furnace cement, fly ash cement, keens cement, and masonry cement. These can be used alone or in combination of two or more. Among these, Portland cement is preferable. More specifically, at least one of ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, and white Portland cement is preferable.

The foamed organic resin granular material only needs to have pores in the individual granular particles. The bulk density of the foamed organic resin powder is usually 0.08 g / cm ³ or less, preferably 0.03 g / cm ³ or less, more preferably 0.015 g / cm ³ or less.

  The foamed organic resin constituting the foamed organic resin powder is not particularly limited. For example, known foamed organic resins such as foamed polystyrene, foamed phenol, foamed polyethylene, foamed polypropylene, and foamed polyvinyl chloride can be used. These can be used alone or in combination of two or more. Among these, styrene foam is particularly preferable.

  The particle diameter of the foamed organic resin granular material can be appropriately set according to the desired heat insulation, the type of foamed organic resin, and the like. Usually, the average particle size is about 1 to 10 mm. As said granular material, what grind | pulverized the foaming organic resin can be used conveniently. For example, a granular material obtained by crushing expanded polystyrene can also be used. Waste crushed material such as polystyrene foam can also be used, and in this case, it can also contribute to effective use of waste.

  As the foamed organic resin granular material, a flame-treated one may be used. By using a flame retardant treatment, sufficient physical properties can be obtained in terms of fire resistance. The flame retardant treatment method is not particularly limited, and examples thereof include a method of coating an alkoxysilane compound, a silicate compound, a flame retardant treatment agent and the like on a granular material, and a method of adsorbing the granular material.

  The content of the foamed organic resin granular material is 4 parts by weight or more with respect to 100 parts by weight of cement. Preferably it is 5 parts by weight or more. Moreover, although an upper limit is not specifically limited, Usually, it is about 70 weight part. The amount is preferably more than 5 parts by weight and less than 40 parts by weight, more preferably 7 parts by weight or more and 30 parts by weight or less. By defining within this range, more excellent heat insulation and strength can be obtained.

  Furthermore, in addition to cement and foamed organic resin particles, the heat insulating composition may contain inorganic aggregate, organic binder, fibers, additives, and the like, if necessary.

It does not specifically limit as an inorganic aggregate, For example, in addition to mountain sand, river sand, quartz sand, etc., inorganic lightweight aggregate etc. are mentioned. These can be known or commercially available. Moreover, 1 type, or 2 or more types can be mixed and used. Among these, inorganic lightweight aggregates are particularly preferable. Examples of the inorganic lightweight aggregate include pearlite, expanded shale, expanded vermiculite, shirasu balloon, and ALC pulverized material.
The average particle diameter of the inorganic aggregate can be appropriately determined according to desired heat insulation properties, strength, and the like. Usually, the average particle size is 0.05 to 5 mm, preferably about 0.1 to 3 mm.
The content of the inorganic aggregate is 5 to 300 parts by weight with respect to 100 parts by weight of cement. Among these, 10-200 weight part is preferable. By defining within this range, excellent heat insulating properties, strength, etc. can be obtained.

  As the organic binder, those containing known resins, rubbers and the like can be used. Examples of the resins include acrylic resin, vinyl acetate resin, vinyl propionate resin, vinyl versatate resin, vinyl acrylate resin, ethylene vinyl acetate resin, vinyl chloride resin, epoxy resin, polyvinyl alcohol, and cellulose derivatives. . Examples of rubbers include chloroprene rubber, styrene-butadiene rubber, and butadiene rubber. These can be used alone or in combination of two or more.

Such an organic binder can be used in any form. For example, it can be used in the form of an aqueous solution or emulsion as well as powder. In any form, a known product or a commercially available product can be used.
Content of an organic binder is 0.5-50 weight part by solid content with respect to 100 weight part of cement. Among these, 1-30 weight part is preferable. By defining it within such a range, sufficient heat insulation, strength and the like can be obtained.

  Examples of fibers include acrylic fiber, acetate fiber, aramid fiber, copper ammonia fiber (cupra), nylon fiber, novoloid fiber, pulp fiber, viscose rayon, vinylidene fiber, polyester fiber, polyethylene fiber, polyvinyl chloride fiber, polyclar. Examples thereof include organic fibers such as fibers, vorinosic fibers, and polypropylene fibers; inorganic fibers such as carbon fibers, rock wool, glass fibers, silica fibers, silica-alumina fibers, carbon fibers, and silicon carbide fibers.

  The fiber content is 0.5 to 50 parts by weight with respect to 100 parts by weight of cement. Among these, 1-30 weight part is preferable. By defining it within such a range, sufficient strength can be obtained.

  As additives, curing accelerators, water reducing agents, surfactants, flame retardants, antifoaming agents, film-forming aids, and the like can be blended.

  The heat insulating material composition can be prepared by uniformly mixing cement and foamed organic resin particles with a mixer, a mixer or the like. What is necessary is just to mix | blend said inorganic aggregate, an organic binder, a fiber, an additive, etc. as needed. At the time of mixing, you may mix | blend water as needed. Although the compounding quantity of water is not limited, what is necessary is just to be about 100-1500 weight part normally with respect to 100 weight part of cement.

The heat insulating layer (hereinafter, also referred to as “heat insulating layer”) formed using the heat insulating composition of the present invention exhibits excellent heat insulating properties and fire resistance. Specifically, the heat conductivity of the heat insulating layer (thickness 30 mm) obtained by drying the heat insulating composition of the present invention is 0.08 (W / (m · K)) or less, preferably 0.05 or less (W / (M · K)), and heat insulation performance equivalent to that of urethane foam can be exhibited. Further, in the exothermic test specified in ISO 5660, the total calorific value under the conditions of heating intensity 50 kW / m ² and heating time 10 minutes can be 8 MJ / m ² or less, and urethane foam (total calorific value is 200 MJ). / M ² or more).

  Furthermore, it is preferable to add a water-soluble metal salt or a water-soluble polymer to the heat insulating composition in order to enhance the fire resistance of the heat insulating layer. Thereby, it becomes easy to form an inorganic thin layer in the surface layer of a heat insulation layer, and fireproofness can be improved. (Figure 2)

Such water-soluble metal salts are preferably those that dissolve in water to produce metal ions, and more preferably those that produce divalent or higher polyvalent metal ions. For example,
Metal sulfates such as ammonium aluminum sulfate, sodium aluminum sulfate, aluminum sulfate, potassium aluminum sulfate, iron sulfate, potassium iron sulfate, magnesium sulfate, nickel sulfate, zinc sulfate, beryllium sulfate, zirconium sulfate;
Metal phosphates such as aluminum phosphate, cobalt phosphate, magnesium phosphate, magnesium ammonium phosphate, magnesium hydrogen phosphate, zinc phosphate, zinc dihydrogen phosphate;
Metal nitrates such as aluminum nitrate, zinc nitrate, calcium nitrate, cobalt nitrate, bismuth nitrate, zirconium nitrate, cerium nitrate, iron nitrate, iron nitrate, nickel nitrate, magnesium nitrate;
Metal acetates such as zinc acetate and cobalt acetate;
Metal chloride salts such as calcium chloride, aluminum chloride, cobalt chloride, iron chloride,
And one or more of these can be used.

  As said water-soluble metal salt, what dissolve | melts in water especially and produces | generates an aluminum salt is preferable, and aluminum sulfate is especially preferable.

  The ratio of the water-soluble metal salt is usually 0.5 to 30 parts by weight, preferably 1 to 25 parts by weight, and more preferably 2 to 20 parts by weight with respect to 100 parts by weight of cement. If it is this range, an inorganic thin layer will be efficiently formed in the surface layer of a heat insulation layer by interaction with the below-mentioned water-soluble polymer compound, and fireproofness can be improved.

Examples of water-soluble polymer compounds include:
Examples include polyvinyl alcohol, poly (meth) acrylic acid, polyalkylene oxide, biogum, galactomannan derivatives, alginic acid and derivatives thereof, gelatin, casein and albumen, derivatives thereof, and cellulose derivatives. The water-soluble polymer compound is more preferably a high-viscosity product. Specifically, the viscosity of a 1% aqueous solution of the water-soluble polymer compound (value measured at 20 ° C. using a B-type viscometer is shown below). ) Is usually 8000 mPa · s or more, preferably 10,000 mPa · s or more, more preferably 12000 mPa · s or more.

  The ratio of the water-soluble polymer compound is usually 0.5 to 30 parts by weight, preferably 0.8 to 15 parts by weight, and more preferably 1 to 10 parts by weight with respect to 100 parts by weight of cement. If it is this range, an inorganic thin layer will be efficiently formed in the surface layer of a heat insulation layer by interaction with water-soluble metal salt, and fireproofness can be improved.

  In the present invention, by using a water-soluble metal salt and a water-soluble polymer compound in combination, an inorganic thin layer can be formed efficiently, and fire resistance can be improved. The action mechanism is not clear, but it is presumed that the water retention improvement effect by both components contributes.

  The inorganic thin layer is derived from the cement component and includes at least a Ca component and a Si component. The inorganic thin layer is formed by solidifying the cement component dispersed or dissolved in water in the surface layer of the heat insulating composition in the curing stage of the heat insulating composition. The thickness of the inorganic thin layer is preferably 0.05 to 1 mm, more preferably 0.08 to 0.5 mm, and still more preferably 0.1 to 0.4 mm.

  In the present invention, as shown in FIG. 3, a noncombustible material can be laminated on the upper part of the honeycomb core structure. Non-combustible materials laminated on top of the honeycomb core structure include steel plate, galvanized steel plate, stainless steel plate, aluminum / zinc alloy plate, metal plate material such as aluminum plate, calcium silicate plate, fiber mixed calcium silicate plate, calcium carbonate Board, gypsum board board, reinforced gypsum board, pearlite cement board, fiber reinforced cement board, wood chip cement board, wood powder cement board, inorganic board material such as slag gypsum board, inorganic board material such as rock wool insulation board, ceramic wool blanket Examples thereof include a sheet-like material such as alumina silica fiber felt, ceramic paper, and aluminum hydroxide paper, or a coating surface formed of a hydraulic inorganic material such as cement or gypsum. By laminating such incombustible materials, strength and fire resistance are improved. In the present invention, it is particularly preferable to use a hydraulic inorganic material. A hydraulic inorganic material has high adhesiveness with the heat insulating composition with which the cell part was filled, and can improve intensity | strength. Furthermore, it is excellent in workability and workability during on-site construction.

  As the upper floor surface provided on the support, a known material such as aluminum, steel, concrete, synthetic resin, wood, or a composite material combining these can be used. Furthermore, you may provide decorative layers, such as a carpet, on it.

In FIG. 4, the construction method example of the double floor structure of this invention is shown. The construction method of the double floor structure of the present invention includes the following steps.
(1) A step of standing a support on a substrate (FIG. 4A),
(2) A step of laminating a honeycomb core structure on a substrate (FIG. 4B),
(3) Step of laminating noncombustible material on top of honeycomb core structure (FIG. 4C)
(4) Step of providing the upper floor on the support (FIG. 4 (d))
However, the step (3) is performed only when a non-combustible material is laminated.

  In the above (1), examples of the method for erecting the support on the base material include a method of embedding in advance at the time of base material construction, a method of fixing with a bolt after the base material construction, and the like. What is necessary is just to set suitably the number of a support body, the space | interval to stand, etc.

In the above (2), as a method of laminating the honeycomb core structure, a honeycomb core in which the cell portion is previously filled with the heat insulating composition may be laminated. However, in the present invention, the honeycomb core is formed on the substrate. It is preferable to place in a spread state (a state in which the heat insulating composition can be filled), and then fill the cell portion with the heat insulating composition and laminate.
When placing a honeycomb core on a substrate,
(I) a method of placing a honeycomb core having a pre-expanded shape on a substrate;
(II) A method of applying an adhesive or the like to the substrate and then placing the honeycomb core in an expanded state,
(III) A method of placing a part of the cell part of the honeycomb core on a support and placing the honeycomb core in an expanded state,
Etc. In the present invention, the method (III) is preferable. As a method for fixing the honeycomb core to the support, a method in which the support is passed through a part of the cell part of the honeycomb core, an adhesive is applied to the honeycomb core, and the support is supported. The method of immobilizing on a body is mentioned. By fixing a part of the honeycomb core to the support, the folded honeycomb core can be easily expanded, and the cell can be easily filled with the heat insulating composition.

  In (2) above, the method of filling the cell portion of the honeycomb core with the heat insulating material composition is not particularly limited, and examples thereof include pouring, spraying, and iron coating. Moreover, when filling by pouring, spraying, etc., it is preferable to finish the surface smoothly using a trowel, a spatula, a roller, etc.

  In the above (3), when laminating nonflammable materials, the heat insulating composition of (2) may be in a cured state, semi-cured or uncured state, but a plate-like material such as a metal plate In this case, it is preferable to laminate after curing of the heat insulating composition. On the other hand, in the case of a hydraulic inorganic material such as cement or gypsum, it can be laminated in a semi-cured or uncured state after filling with the heat insulating composition. In this case, the adhesiveness with the heat insulating composition filled in the cell portion of the honeycomb core is high, and the strength is preferable. When laminating hydraulic inorganic materials, methods such as pouring, spraying, and troweling can be employed.

  In the above (4), when the upper floor surface is provided on the support, the nonflammable material may be continued after the lamination, but when the hydraulic inorganic material is used as the nonflammable material in the above (3), It is preferable to carry out after drying the hydraulic inorganic material.

  In the double floor structure of the present invention, wiring or wiring maintenance is performed by removing the upper floor surface. Since the internal floor surface (FIG. 1) of the double floor structure of the present invention has a structure in which a honeycomb core structure is laminated on a substrate, it can exhibit excellent strength. For this reason, at the time of wiring or wiring maintenance, a person can walk, and even when the wiring is complicated, it is possible to work efficiently.

  Examples are given below to clarify the features of the present invention.

(Honeycomb core)
Paper honeycomb core (height: 30 mm, cell shape: rectangular, cell size: 116 mm × 58 mm, compressive strength: 9.7 N / cm ² )
(Insulating composition 1)
100 parts by weight of cement, 20 parts by weight of foamed organic resin particles, 70 parts by weight of inorganic aggregate, 5 parts by weight of organic binder, 5 parts by weight of additive, and water were uniformly mixed to prepare heat insulating composition 1.
(Insulating composition 2)
100 parts by weight of cement, 20 parts by weight of foamed organic resin granules, 70 parts by weight of inorganic aggregate, 5 parts by weight of organic binder, 10 parts by weight of water-soluble metal salt, 5 parts by weight of water-soluble polymer, 5 parts by weight of additives, Water was uniformly mixed to prepare a heat insulating composition 2.
(Non-combustible material)
100 parts by weight of cement, 70 parts by weight of an inorganic aggregate, 5 parts by weight of an organic binder, 3 parts by weight of fibers, 5 parts by weight of additives, and water were uniformly mixed to prepare a composition for incombustible materials.
In addition, the raw material used is shown below.
・ Cement: Ordinary Portland cement ・ Foamed organic resin granules: Recycled recycled polystyrene foam (average particle diameter of about 5 mm, bulk density of 0.012 g / cm ³ )
・ Inorganic aggregate: perlite (average particle size 0.1 mm), pulverized ALC (average particle size 0.5 mm)
Organic binder: powdered methyl cellulose Water-soluble metal salt: aluminum sulfate Water-soluble polymer compound: methyl cellulose (1% aqueous solution has a viscosity of 15000 mPa · s)
・ Additive: Curing accelerator

Example 1
A support was erected on the concrete substrate, and the honeycomb core was spread and placed on the concrete substrate. After the heat insulating composition 1 was poured and filled into the cell portion of the honeycomb core, the surface was smoothed and sufficiently dried, and the upper floor surface was installed to form a double floor structure. This double floor structure was good in terms of workability, workability, fire resistance, heat insulation, and strength.

(Example 2)
A support was erected on the concrete substrate, and the honeycomb core was spread and placed on the concrete substrate. After the heat insulating composition 2 was poured into the cell portion of the honeycomb core and filled, the surface was smoothed and sufficiently dried. An inorganic thin layer was formed on the surface layer of the heat insulating composition of the honeycomb structure.
Next, an upper floor surface was installed in the same manner as in Example 1 to obtain a double floor structure. This double floor structure was good in terms of workability, workability, fire resistance, heat insulation, and strength.

(Example 3)
A support was erected on the concrete base, and the honeycomb core was placed on the concrete base so as to fix the honeycomb core to the support while passing the support through a part of the cells. The heat insulating composition 1 was poured into the cell portion of the honeycomb core and filled, and then the surface was smoothed. Next, a non-combustible material was applied to the surface and laminated, dried sufficiently, and an upper floor surface was installed to form a double floor structure. This double floor structure was good in terms of workability, workability, fire resistance, heat insulation, and strength.

1: Substrate 2: Honeycomb core 3: Insulating layer (insulating composition)
31: Inorganic thin layer 4: Honeycomb core structure 5: Noncombustible material 6: Internal floor surface 61: Internal floor surface 7: Support body 8: Upper floor surface 9: Wiring

Claims (4)

On a substrate, in a double floor structure comprising a support and an upper floor on the support,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. A double floor structure characterized in that a honeycomb core structure filled with a heat insulating composition containing -30 parts by weight is laminated A support is erected on the base material,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. Laminating a honeycomb core structure filled with a heat insulating composition containing -30 parts by weight ;
A method for constructing a double floor, characterized in that an upper floor is provided on the support. On a substrate, in a double floor structure comprising a support and an upper floor on the support,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. A honeycomb core structure filled with a heat insulating composition containing ˜30 parts by weight is laminated,
Further, a double floor structure characterized in that a non-combustible material is laminated on the upper part of the honeycomb core structure. A support is erected on the base material,
On the base material, 4 parts by weight or more of the foamed organic resin particles , 0.5 to 30 parts by weight of the water-soluble metal salt, 0.5 to 30 parts by weight of the water-soluble polymer compound, and 100 parts by weight of the cement in the cell part of the honeycomb core. Laminating a honeycomb core structure filled with a heat insulating composition containing -30 parts by weight ;
Laminating a non-combustible material on top of the honeycomb core structure,
A method for constructing a double floor, characterized in that an upper floor is provided on the support.

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