JPH09242210A - Adiabatic plate used also as flask - Google Patents

Abstract

PROBLEM TO BE SOLVED: Not to generate smoke or the like from fireworks in welding or the like by adhering a non-water permeable sheet and moisture proof sheet unitedly respectively to the front and rear surfaces of a mineral fiber plate having specified heat conductivity and bending strength. SOLUTION: A mineral fiber plate 10 consists of mineral fibers, a inorganic foaming body and a binding material and if necessary has organic fibers added thereto. This mineral fiber plate 10 comprises two thin mineral fiber base plates 13 glued to each other unitedly or at least one mineral fiber base plate 13. Also, this base plate 13 having less than 0.04kcal/m.h.of thermal conductivity and at least 15kgf/cm<2> of bending strength to be suitably used for a weir plate of a form work. By using such predetermined materials, a non-water permeable sheet 11 and moisture proof sheet are laminated unitedly on the front and rear surfaces of the material by ethylene vinyl acetate system adhesives for example and then a parafin system butt end processing agent is applied to the end face of the butt end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating plate which can be used as a dam of a mold for forming a concrete wall or the like and can also be used as a heat insulating material for the concrete wall or the like.

[0002]

2. Description of the Related Art Conventionally, as a heat insulating plate that also serves as a mold for reducing the number of production steps and improving productivity, a low-foaming styrene or other synthetic resin plate, a low specific gravity silica plate, or Japanese Patent Publication No.
No. 6244 discloses a heat insulating material panel that also serves as a formwork / interior base.

[0003]

However, in the case of the low specific gravity calical plate according to the above-mentioned conventional example, although it is a non-combustible material, its thermal conductivity is lower than that of the foamed plastic plate,
Further, since the strength is low, there is a problem in construction. on the other hand,
According to the heat insulating material panel that also serves as a formwork / interior groundwork, since a foamed plastic heat insulating plate is used, it is possible to perform welding during field construction.
There is a problem that fire and smoke may occur due to the melting spark.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a heat insulating plate which also serves as a formwork and which has good workability and does not cause fire or smoke due to sparks such as welding at the site.

[0005]

In order to achieve the above-mentioned object, a heat insulating plate serving also as a mold according to the present invention has a thermal conductivity of 0.04.
It has a structure in which a water-impermeable sheet is stuck and integrated on one side of a mineral fiber board having a kcal / m · h · ° C or less and a bending strength of 15 kgf / cm ² or more. A moisture resistant sheet may be attached and integrated on one side of the mineral fiber board, and a phenol resin or other water resistant resin is applied and impregnated on at least one side of the mineral fiber board. You may stay. Further, the water-impermeable sheet may have a three-layer structure in which a vegetable fiber sheet is laminated and integrated on the front and back surfaces of an olefin film and a metal foil, while the moisture-resistant sheet is subjected to a flameproof treatment. It may be a plant fiber sheet. Furthermore, at least one end surface of the mineral fiber board may be waterproofed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIG. As shown in FIG. 1, the formwork and heat insulating plate according to the present embodiment is a product in which a water impermeable sheet 11 and a moisture resistant sheet 12 are adhered and integrated on the front and back surfaces of a mineral fiber board 10. is there.

The mineral fiber board 10 has the following composition.
Highly heat-insulating, lightweight, non-combustible, semi-incombustible or flame-retardant with high bending strength and flexural modulus can be obtained. Furthermore, considering the case of placing concrete, the water absorption is small,
It is necessary that it does not easily swell even if it absorbs water, that it is easy to dry, and that it has strong adhesion to concrete. Therefore, the mineral fiber board 10 according to the present invention has the mineral fibers, the inorganic foam, and the binder as essential components, and organic fibers or the like are added to these as necessary. As shown in FIG. 1, the mineral fiber board 10 may be one in which two thin mineral fiber substrates 13 are bonded and integrated from the viewpoint of productivity, but one mineral fiber is used. It may be composed of the substrate 13, or may be composed of three or more mineral fiber substrates 13.

Regarding thermal insulation, thermal conductivity is 0.04 kcal / m
・ It must be below h ・ ℃. This is due to the following reasons. That is, according to the Ministry of International Trade and Industry and Ministry of Construction Notification No. 2, the judgment standard of the building owner is that the thermal resistance value in the area IV is 0.9 and the resistance value in the area V is 0.6. This thermal resistance value is determined by the thickness and thermal conductivity of the heat insulating material when the thickness of the concrete wall is constant, but thickening the heat insulating material reduces the effective area of the building, so avoid this problem. In order to achieve the above, the mineral fiber board 1 having a low thermal conductivity as described above is used.
This is because it is necessary to use 0.

The bending strength must be 15 kgf / cm ² or more. If it is less than 15 kgf / cm ^2, it is not possible to take a wide space between the thick timber and the splints, it takes time and labor for the construction, and it cannot be used as a dam for the formwork. The flexural modulus needs to be 1500 kgf / cm ² or more. This is because if it is less than 1500 kgf / cm ² , swelling occurs in the thickness direction due to the weight of concrete, and a concrete wall having a uniform thickness cannot be obtained.

Examples of the mineral fiber include rock wool, slag wool, mineral wool, glass fiber and the like, and these may be used alone or in combination of two or more kinds. The composition ratio of the mineral fibers in the mineral fiber board is preferably 60% by weight or more. When it is less than 60% by weight, the strength due to the entanglement of fibers becomes low and a large amount of binder is required.

The inorganic foams are for reducing weight while ensuring fire resistance and bending strength, and include, for example, perlite, shirasu foam, silica flour, glass foam, and the like. Alternatively, two or more kinds can be used in combination. The composition ratio of the inorganic foam in the mineral fiber board is preferably 30% by weight or less. 3
This is because if it exceeds 0% by weight, the amount of the mineral fiber or the binder becomes relatively low, and it is difficult to obtain the required strength.

The binder is used for connecting and integrating the mineral fibers and the inorganic foam, and examples thereof include synthetic resins such as polyvinyl alcohol resin and phenol resin, starch, and the like. Alternatively, two or more kinds can be used in combination.

If necessary, organic fibers may be added to the mineral fiber board. Examples of the organic fibers include synthetic resin fibers such as polypropylene fibers, pulp, and the like. They can be used alone or in combination of two or more. The composition ratio of the binder and the organic fiber in the mineral fiber board is preferably 7 to 15% by weight. This is because less than 7% by weight is a standard to be certified as a non-combustible material, and 7 to 15% is a standard to be certified as a semi-combustible material. If the flame-retardant material is good, more binders and organic fibers can be added.

Further, in order to enhance water resistance, at least one surface of the mineral fiber board 10 may be coated and impregnated with a phenol resin or the like.

The water-impermeable sheet 11 is for preventing the moisture of concrete from moving and swelling in the mineral fiber board, and for improving the adhesiveness between the concrete and the mineral fiber board. For example, a three-layer structure in which a vegetable fiber sheet such as paper or nonwoven fabric is laminated and integrated on the front and back surfaces of an olefin resin film or a metal foil is exemplified. It is preferable that the plant fiber sheet has a large contact area with the concrete and a large adhesiveness with the concrete.

The moisture resistant sheet 12 is intended to prevent swelling of the mineral fiber board due to moisture absorption and to facilitate the GL construction method, and examples thereof include moisture resistant cardboard base paper. However, it is preferable to use a material coated or impregnated with a flame retardant in order to prevent the occurrence of fire. Then, the moisture resistant sheet 12 is attached and integrated with the adhesive on the back surface of the mineral fiber board 10 on which the water impermeable sheet 11 is attached.

[0017]

Next, an embodiment of the present invention will be described. (Example) As a mineral fiber board, 25 mm thick Dailawton (registered trademark, Daiken Kogyo Co., Ltd.) was used, and a water impermeable sheet and a moisture resistant sheet were laminated on the front and back surfaces thereof with an ethylene vinyl acetate adhesive, respectively. A sample was made by integrating and then applying a paraffin type wood mouth treatment agent to the end surface of the wood mouth.

Said Dailawton uses 60 parts by weight of rock wool as mineral fibers and 2 parts of inorganic foam such as pearlite.
5 parts by weight, 6 parts by weight of starch and a resin-based binder as a binder, and 2 sheets of 12 mm-thick mineral fiber substrates having a composition of 9 parts by weight of pulp as an organic fiber, which are bonded and integrated with an adhesive. Is. Furthermore, the front and back surfaces are coated and impregnated with a phenol resin.

The water-impermeable sheet has a thickness of 20 μm.
A polyethylene film having a three-layer structure in which vegetable fiber sheets were laminated and integrated on the front and back surfaces was used, and a moisture-resistant cardboard base paper was used as the moisture-resistant sheet.

Comparative Example 1 A 25 mm thick foamed styrene board was used as a sample.

Comparative Example 2 A calcium silicate plate alone having a thickness of 30 mm was used as a sample.

Then, the results of measuring the characteristics of the samples of the above Examples and Comparative Examples 1 and 2 are shown below. Examples Comparative Example 1 Comparative Example 2 Specific gravity 0.25 0.08 0.3 Bending strength (kgf / cm ² ) 20 15 10 Bending elastic modulus (kgf / cm ² ) 1500 1700 760 Thermal conductivity (kcal / m · h ・ ℃) 0.039 0.023 0.06 Non-combustible Flame-retardant class 3 ---

The bending strength is JIS-A-6301.
It measured based on. Flexural modulus is JIS-Z-21
13 was measured. Thermal conductivity is JIS-A-1
412. Nonflammability is JIS-A-1
321, and was measured.

As is clear from the measurement results, this example is about 20% lighter than the calcium silicate board and has a bending strength of about 1.3 times that of the expanded styrene board and twice that of the calcium silicate board. It was found that the flexural modulus was almost the same as that of the expanded styrene board and about twice that of the calcium silicate board. Furthermore, this example is superior to the calcium silicate board in its thermal conductivity, although it is slightly inferior to the foamed styrene board. It was found to have excellent flame retardancy that is incomparable to

Next, the samples according to the examples were put into an absolutely dry state and left for about 2 months, and the change in thermal conductivity when the water content increased due to moisture absorption was measured in the same manner as described above. The temperature at the time of measurement was 22.3 to 22.8 ° C. FIG. 2 shows the measurement results. As is clear from the measurement results, the thermal conductivity is 0.0 even when the water content exceeds 5%.
It was 6 kcal / m · h · ° C or less, and it was found that it had better heat insulation than the calcium silicate plate.

Further, the inner end thick 1 made of a square pipe is erected at the intervals shown in FIG. 3 (a), and as shown in FIG. 4, the 3 × 6 plate sample 2 according to the present embodiment is used as a mold. By using it as a weir, a concrete wall having an overall thickness of 300 mm and a height of 1800 mm was formed integrally with Sample 2 according to this example. In addition, 3 is a plywood form, 4 is a four-time, 5 is a thick outer edge, 6 is a separator, and 7 is concrete. Then, on the concrete wall surface, a stretcher (not shown) is attached to the upper, middle, and lower surfaces of the sample 2 surface, and the measurement positions (A, B ...
The unevenness in U) was measured with a dial gauge. The measurement result is shown in FIG. However, in the measurement position, the part in parentheses means the case where it coincides with the axis of the square pipe.

As is apparent from FIG. 3 (b), even when the distance between the square pipes is as wide as 270 mm, the unevenness of the upper, middle and lower steps on the wall surface is 4 mm or less at the maximum, and G
It was found that the L construction method can be used as a weirboard of a mold because it can form an indoor inner wall having a smooth surface. Further, no water absorption was observed from the mortar surface.

[0028]

As is apparent from the above description, when the concrete heat insulating plate according to claim 1 of the present invention is used as a dam of a formwork to form a concrete wall, a mineral fiber board is formed on one side of the concrete wall. Since the surface is exposed, no sparks or smoke will be generated by sparks such as welding at the site. According to the second aspect, by preventing the mineral fiber board from absorbing moisture, it is possible to prevent the deterioration of the heat insulating property and it becomes easy to adopt the GL method. According to the third aspect, since the water resistant resin is applied and impregnated on at least one surface of the mineral fiber board, it becomes more difficult for water to enter the mineral fiber board, and a decrease in heat insulating property is prevented. At the same time, the water-impermeable sheet and the moisture-resistant sheet are more difficult to peel off. According to claim 4,
Since the water-impermeable sheet is made by adhering the vegetable fiber sheet to the front and back surfaces of the olefin film, it is possible to effectively prevent the movement of water from the concrete, and the vegetable fiber sheet increases the contact area. Then, the adhesion with concrete is further improved. According to claim 5, since the moisture-proof sheet is subjected to flameproof treatment,
Smoke generation becomes even more difficult to occur. According to claim 6, since at least one end face of the mineral fiber board is waterproofed, water does not enter from the end face due to a capillary phenomenon, and it is possible to prevent swelling of the mineral fiber. This has the effect of more effectively preventing peeling of the water-impermeable sheet and the moisture resistant sheet.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a graph showing the thermal conductivity of samples according to examples.

FIG. 3 shows a case where a concrete wall is formed by a sample according to an example, FIG. 3A shows a schematic front view of a concrete wall and a measurement position, and FIG. 3B is a graph showing a measurement result of surface irregularities. It is a figure.

FIG. 4 is a cross-sectional view showing a construction state of the concrete wall according to FIG.

[Explanation of symbols]

Reference numeral 10 ... Mineral fiber board, 11 ... Water impermeable sheet, 12 ... Moisture resistant sheet, 13 ... Mineral fiber board.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masako Ryukaku 4-13-1, Honmachi, Chuo-ku, Osaka-shi, Osaka Takenaka Corporation Osaka Main Store (72) Inventor Yuuki Nakai Honcho, Chuo-ku, Osaka-shi, Osaka 4-chome 1-13 Takenaka Corporation Osaka Main Store (72) Inventor Makoto Ogawa 1 Inami, Inami-cho, Higashitonami-gun, Toyama Prefecture Daiken Kogyo Co., Ltd. (72) Inventor Jiro Okada Higashitonami, Toyama Prefecture 1 Inami, Gunami-cho, Daiken Kogyo Co., Ltd.

Claims (6)

[Claims] 1. A thermal conductivity of 0.04 kcal / m · h · ° C. or less,
In addition, a heat insulating plate that also serves as a formwork, characterized in that a water impermeable sheet is attached and integrated on one side of a mineral fiber plate having a bending strength of 15 kgf / cm ² or more. 2. The mineral fiber board has a moisture-resistant sheet adhered to and integrated with the remaining one surface thereof.
A heat insulating plate that also serves as a formwork. 3. The heat insulating plate serving also as a mold according to claim 1, wherein at least one surface of the mineral fiber board is coated and impregnated with a phenol resin or other water resistant resin. 4. The water-impermeable sheet, wherein the vegetable fiber sheet is laminated and integrated on the front and back surfaces of an olefin film.
The heat insulating plate serving also as the mold according to any one of claims 1 to 3, which has a layered structure. 5. The heat insulating plate serving also as a formwork according to claim 2, wherein the moisture resistant sheet is a plant fiber sheet that has been subjected to a flameproof treatment. 6. The heat insulating plate which also serves as a formwork according to claim 1, wherein at least one end surface of the mineral fiber board is waterproofed.