JPS5824048A - Fixing of heat insulating plate of heat insulating structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing heat insulating plates in heat insulating structures such as refrigerated warehouses. The purpose is to provide a method for fixing insulation boards that does not require an excessive moisture barrier layer, is inexpensive, has a short construction period, and has excellent insulation performance.

BACKGROUND ART Conventionally, heat insulating boards such as plastic foam boards are laid out on the inner surface of a heat insulating structure such as a refrigerated warehouse to form a heat insulating layer in order to reduce the amount of heat flowing through. To install this heat insulating board, the heat insulating board is generally fixed to the wall of the structure by applying and pasting roofing tape or felt using plain asphalt to form a moisture-proof layer, using plain asphalt as an adhesive. .

As shown in FIG. 1, this adhesive fixing is generally done by applying molten plano asphalt 111 adhesive 3 in spots or stripes to the wall surface 1 or heat insulating board 2 on which the moisture-proof layer 5 is provided. A heat insulating board 2 is crimped and fixed to a wall surface 1 or a heat insulating board 2 affixed to the inside of the wall surface 1. For this reason, a difference in thickness is created between the wall surface 1 and the heat insulating board 2 or between the heat insulating boards between the part where the plain asphalt adhesive 6 is present and the part where it is not, and a gap 4 is created in the part where the adhesive 6 is not present. easy. If a gap 4 is created, even if a heat insulating board with low moisture permeability such as a polystyrene foam board or a polyurethane foam board is used, water vapor tends to accumulate in the gap 4, which causes dew condensation → freezing phenomenon. There is a drawback that the heat insulating effect is reduced by destroying the heat insulating material layer or by allowing air to flow through the gap 4. In order to prevent the phenomenon of dew condensation and then freezing, the performance of the moisture barrier layer must be maintained at a higher level, which is one of the causes of increased material and construction costs.

In addition, if the wall surface has poor flatness, gaps are likely to form between the wall surface and the heat insulation board, and between the heat insulation boards and the heat insulation board. There is a dimensional change based on the coefficient of linear expansion over time), and if a gap 41 occurs between the ends of the insulation board, or if the adhesion of plain asphalt is poor, the shrinkage force of the insulation board There were drawbacks such as the insulation board falling off due to failure.

In order to make the attachment and fixation of insulation boards more reliable, methods have been developed that use bamboo nails (Special Publication No. 4B-42409) and special plastic nails (Utility Model Publication No. 1989-89807). However, the method using these fixing devices also has the disadvantage that the close contact or pressure between the heat insulating plates is poor, and when they are attached to a vertical body such as a wall, gaps are likely to occur.

The present invention solves the drawbacks of these conventional methods, and when laying and fixing two or more layers of heat insulating boards on the inner side of the wall of a heat insulating structure, the first wall-side layer of the heat insulating boards is bonded by an adhesive layer. The present invention provides a method for fixing heat insulating boards for a structure (3), characterized in that the heat insulating boards are completely fixed to the wall surface, and the heat insulating boards are successively fixed to the wall-side heat insulating board using synthetic resin screws.

The present invention will be explained with reference to the drawings.

Figure 2 shows an example in which two layers of heat insulating boards 2 and 2' are laid on a concrete wall 1 of a heat insulating structure. 7.

The screw nail 7 is screwed into the inside of the heat insulating board 2 through the heat insulating board 21 without destroying the heat insulating board while turning along the thread, and the heat insulating boards 2 and 2' are closely fixed to each other. Unless the heat insulating board 2+ is destroyed, it will not come off from the insulating board 2 through the screws 7, a gap will not be created between the insulating boards 2 and 2', and it will not come off due to contraction of the insulating board during cooling.

The entire surface adhesive layer 6 between the wall and the heat insulating board used in the present invention is made of a double-sided adhesive sheet that also serves as a moisture barrier layer, a polyurethane-based, poxy-based, or synthetic rubber adhesive, plain asphalt, cement, etc. It is sufficient that the wall surface and the insulation board surface be fully adhesively fixed using a material with adhesive strength (4), or cement mortar may be poured onto the insulation board surface using a pouring method or the like and bonded directly. .

If necessary, a moisture-proof layer may be provided on the wall surface, or an adhesive layer that also serves as a moisture-proof layer may be used.

The insulation boards used in the present invention include polystyrene-based, polyurethane-based, polyvinyl chloride-based, phenolic resin-based, or rhusium silicate foam boards with a thickness of 25 mm to 150 mm and a side length of 60 to 180 mm. A rigid insulation board is used. Preferably, an extruded foamed polystyrene plate having a tensile elongation of 5 to 20% in the longitudinal direction made by Japanese Patent Publication No. 42-26950 etc. is used.
Those with a tensile elongation of ~20% absorb the shrinkage of the heat insulating board that occurs when the inside of the heat insulating structure is cooled, and prevent the shape from shrinking. Good heat insulation performance can be maintained without creating gaps at the joints of the heat insulation plates.

In addition, the synthetic resin screwdriver used in the present invention is made of polyacetal, polycarbonate, polypropylene, polyethylene, or ABS type resin with a diameter of 5 to 2 mm.
0. , screw nails with a length of 40 to 150 length are used.

The shape of the screw nail may be similar to that of a normal metal screw nail, but it is preferable that the screw thread be slightly higher and the number of screw threads per unit length be slightly smaller by 30 to 50%, so that it can bite into the insulation board. is good, and the result is that the heat insulating plates are tightly fixed together.

In addition, the method of laying and fixing the heat insulating board 21 on the heat insulating board 2 is to shift and overlap the heat insulating board 21 so that the ends of the heat insulating board 2 and the ends of the heat insulating board 21 do not match, and then screw the synthetic resin screw nails 7 Paste and fix by. It is preferable that the screws 7 are inserted and fixed at a position 6 to 10 cm from the end of the heat insulating plate. The screws 7 are fixed at the ends of the heat insulating board (generally, the coefficient of linear expansion is 1 to 100 x 10-5 crn/m°C).
) This is because both ends of the heat insulating board are fixed with screws, which suppresses shrinkage during cooling, and almost no gaps are created at the ends of the heat insulating board due to shrinkage. Note that the present invention will be described by way of examples, not only for vertical walls but also for ceilings and floors.

Example 1 A double-sided adhesive moisture-proof sheet was applied to the entire inner wall of a refrigerated warehouse made of a waterproof plywood board with a thickness of 12 mm, and an extruded polystyrene foam board (75" 60 x 90" thick and having a tensile elongation of about 10%) was attached to the inner wall of a refrigerated warehouse.
Styrofoam FX-10P (trade name, manufactured by Asahi Dow Co., Ltd.) was laid and fixed on the entire surface. Furthermore, on top of this extruded polystyrene foam board, similar heat insulating boards are stacked so that the joint positions do not overlap.
Four high-density polyethylene screw nails having a length of 125+ai+ and a diameter of 15 and number of dragon screw threads of 12 were screwed and fixed at the 0 cm position. Insulating material was laid on the floor using the conventional construction method, but on the ceiling, heat insulating boards were laid and fixed in the same way as for the walls, using double-sided adhesive moisture-proof sheets and screw nails.
A cold storage warehouse of 0 m3 was constructed. Inside the cold storage warehouse -1
When cooled to 0 (7) °C, there were no gaps between the joints of the heat insulating boards, the heat insulating boards were well fixed, and nothing came off, resulting in a refrigerated warehouse with extremely good heat insulation effects.

In addition, compared to conventional construction methods, it does not use molten plain asphalt, so the working environment is better, and the workability is approximately 20%.
% could be improved.

Example 2 An extruded polystyrene foam plate (trade name, from Styrofoam) with a thickness of 50 mm and a size of 90 x 180 degrees was installed on the inner wall of a refrigerated warehouse using the concrete pouring method. Furthermore, a heat insulating board made of extruded foamed polystyrene board (trade name, Styrofoam FX-10 manufactured by Asahi Dow Co., Ltd.) having a thickness of 50mm, 60'"l x 90'"' and a tensile elongation of about 10% was placed at the joint position. Approximately 5 Crn from the four sides of the upper layer insulation board, making sure that the
They were fixed at the position using polyacetal resin screws with a length of 80 cm and a diameter of 10 threads and a number of 10 threads, and were sequentially stacked and fixed to provide four layers of 200 thread heat insulation boards. A refrigerated warehouse of approximately 500m' was constructed using the conventional construction method for the floor and the same construction method as the walls for the ceiling (8), with four layers of similar heat insulating boards laid and fixed. The concrete used was mixed with a styrene-butadiene copolymer latex with a solid content of about 100% to improve the moisture-proofing performance of the concrete wall and the adhesion to the insulation board. When cooled to ℃, there was no peeling between the insulation board and the concrete wall, no separation between the insulation board and the insulation board, and no gaps were observed between the insulation boards.As in Example 1, a refrigerated warehouse with an extremely good insulation effect was obtained. Obtained.

Comparative Example: Bamboo nails (Special Public Interest Publication 4e-
42409) and synthetic resin nails with detent
5-89807) and two extruded polystyrene foam plates (trade name: Styrofoam IB) having a thickness of 75 mm were inserted and bonded using the synthetic resin screws used in the present invention. The results of measuring each bond strength are shown in the table below.

As described above, the present invention can be installed and fixed without leaving gaps between the wall surface and the heat insulating board that are fully fixed, between the layers of the heat insulating board fixed by screwing, and between the joints of the heat insulating board, and can improve the heat insulation performance. The installed insulation board will not come off due to shrinkage or create joint gaps even when cooled.
There is no danger of air containing water vapor stagnating in the gaps and wetting the insulation board and reducing its insulation performance, or that water vapor condenses or freezes and destroys the insulation board. In addition, if a material with high moisture resistance, such as an extruded polystyrene foam board, is used as the heat insulating board, there is no need to increase the moisture resistance of the wall surface of the building structure. 1. Workability is improved, construction cost and construction period are reduced.If a heat insulating board with high tensile elongation is used, the shrinkage stress during cooling is easily absorbed and relaxed within the heat insulating board, making the installed and fixed heat insulating board even more stable. It is stable and more suitable.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a heat insulating layer according to a conventional construction method, FIG. 2 is a longitudinal sectional view of a heat insulating layer according to an example of the construction method of the present invention, and FIG.
The figure is a perspective view of an example of a synthetic resin screwdriver. 1. Wall surface, 2.21. Heat insulation board, 6. Plain asphalt adhesive, 4. Gap, 4". Gap generated during cooling, 5. Moisture barrier layer, 6. Adhesive layer, 7.・Synthetic resin screw nail patent applicant Asahi Dow Co., Ltd.

Claims (4)

[Claims] (1) When laying and fixing two or more layers of insulation boards on the inner side of the wall of a heat insulation structure, the first layer of insulation boards on the wall side is completely fixed to the wall surface with an adhesive layer, and the insulation board on the wall side A method of fixing heat insulating boards for a heat insulating structure, characterized by sequentially fixing the heat insulating boards with synthetic resin screws. (2) Fixing the insulation board with synthetic resin screws. A method for fixing a heat insulating board for a heat insulating structure according to claim 1, wherein the heat insulating board is fixed at a position 3 to 10 cm from the end of the board. (3) The method for fixing a heat insulating board for a heat insulating structure according to claim 1, wherein the heat insulating board is an extruded polystyrene foam plate having a tensile elongation of 5 to 20% in the length direction. (4) Synthetic resin screw nails have a diameter of 5 to 10 mm and a length of 50 mm.
~150mm, 3 to 10 threads. 1. A method of fixing a heat insulating board for a heat insulating structure according to claim 1, wherein: