JPH1122045A - External thermal insulation work executing method of refrigerated warehouse or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute work with high reliability by filling communicating foam having a low independent foaming characteristic between hard urethane foam sprayed on an outside surface of a concrete building frame and a sandwich panel. SOLUTION: A prescribed interval is held from an outside surface of a concrete building frame 1, and a sandwich panel 2 is built up on the outside. Next, hard urethane foam 3 is sprayed in a prescribed thickness on the outside surface of the concrete building frame 1. Next, communicating foam 4 having an independent foaming characteristic not more than 50% is injected and foamed between the sprayed hard urethane foam 3 and the sandwich panel 2. After these works finish, a second row panel 2 is built up on the sandwich panel 2, and similar work is repeated. Hard urethane foam having comparatively slow reactivity such as cream time is 10 to 50 seconds and rise time is 100 to 250 seconds may be used instead of the communicating foam 4. Therefore, the influence of a temperature of the building frame 1 is removed, and highly reliable execution work can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for externally preventing heat in a refrigerated warehouse or the like in which a sandwich panel is installed on the outer surface of a refrigerated warehouse and a hard urethane foam is filled between the panel and the skeleton.

[0002]

2. Description of the Related Art For example, in the past, heat insulation in a refrigerated warehouse or the like was mainly performed by internal heat insulation. As shown in FIG. 7, for example, as shown in FIG. 7, first, a sandwich panel (formed by filling a heat insulating material such as hard urethane foam or styrene foam between iron plates) 2 Is installed, and then the hard urethane foam 10 is blown between the outer surface of the skeleton and the sandwich panel 2, and the filling is performed. Also, as shown in FIG. There is known a construction method in which the rigid urethane foam 11 is injected, foamed, and filled after the sandwich panel 2 is installed.

[0003]

However, in any construction method, the panel is likely to be deformed (warped) due to the primary shrinkage of the foam after foaming and the foaming pressure at the time of foaming. That is, according to the construction method, for example, the deformation (warpage) of the panel is large due to shrinkage of the urethane foam after foaming (for example, occurrence of 5 mm or more and 13 mm or less),
According to the construction method described above, there is an inconvenience that the panel is easily deformed (warped) due to the foaming pressure of the urethane foam during injection foaming.

Accordingly, the present invention has been made in view of the above circumstances, and provides an external heat protection construction method for a refrigerated warehouse or the like which can minimize deformation of panels at the time of filling and after filling with rigid urethane foam. It is intended for.

[0005]

That is, according to the first aspect of the present invention, a sandwich panel with an iron plate is installed on the outer surface of the skeleton, and the heat insulating self-adhesiveness between the panel and the skeleton is excellent. It is an external heat insulation construction method such as a refrigerated warehouse that fills the foam, after spraying the foam on the skeleton side in advance,
The foam is filled between the sprayed foam and the sandwich panel.

[0006] The invention described in claim 2 is the invention according to claim 1.
In the invention described in the above item, a continuous foam having a closed cell ratio of 50% or less is injected and foamed as the foam to be filled.

[0007] The invention according to claim 3 provides the invention according to claim 1.
In the invention described in 1 above, the foam to be filled has a cream time of 10 to 50 seconds and a rise time of 100 to 2
Injection / foaming is performed by filling a substance having a relatively slow reactivity of 50 seconds.

[0008] The invention described in claim 4 is the first invention.
In the invention described in (1), the foam is filled by blowing.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a flowchart showing a method for external heat protection such as a refrigerated warehouse according to the present invention, and comprises a first step S1 to a fourth step S4. In this embodiment, the present invention is applied to a refrigerated warehouse or the like. However, the present invention can be applied to, for example, a normal concrete building constructed in a cold region or a warm region.

First, as shown in FIG. 2, the sandwich panel 2 is erected outside the concrete skeleton 1 at a predetermined distance from the outer surface of the concrete skeleton 1 (first).
Step S1). Here, the sandwich panel 2 has the same configuration as that described in the section of the prior art.

Next, as shown in FIG. 3, a hard urethane foam (using a material having excellent heat insulating self-adhesiveness) 3 is formed on the outer surface of the concrete frame 1 with a predetermined thickness (for example,
Spray (minimum 20 mm to maximum 250 mm) (second step S2). Note that FIG. 2 (first step S1) and FIG.
Conversely, the operation of (second step S2) may be performed from the side of FIG.

Thereafter, as shown in FIG. 4, a closed cell having low closed cells is formed in a gap (about 10 mm to 150 mm) between the blown rigid urethane foam 3 and the sandwich panel 2 by using, for example, a foaming machine for spraying. (For example, 50% or less)
The communication form 4 is filled (third step S3). Here, if the filling height of the communication form 4 is, for example, about 900 mm, the filling may be performed up to the height by two filling operations (4A, 4B).

When the above operation is completed, the panel in the second row is erected on the sandwich panel 2, and the same operation is repeated. This series of operations is repeated an appropriate number of times.

According to the present invention, in addition to the embodiment, as shown in FIG. 5, for example, instead of filling the communicating foam 4 having a low closed cell property (for example, 50% or less) in the third step S3, as shown in FIG. And the cream time is 10
Rigid urethane foam 4 'having a relatively slow reactivity of 50 seconds and a rise time of 100 to 250 seconds may be injected, foamed and filled.

In addition, as shown in FIG. 6, for example, in the third step S3, the closed cell property is low (for example, 50%
In the following, instead of filling the communication foam 4, an ordinary hard urethane foam for spraying 4 ″ having a high reactivity may be sprayed and filled (spray foam).

[0016]

As described above, according to the first aspect of the present invention, after the rigid urethane foam is sprayed on the skeleton side in advance, the rigid urethane foam is interposed between the sprayed hard urethane foam and the sandwich panel. Since the foam is filled, in other words, by spraying the hard urethane foam on the concrete skeleton, the shrinkage of the filled preform due to the influence of the skeleton temperature can be effectively prevented particularly in winter.

Further, according to the present invention, prior to filling the rigid urethane foam, the rigid urethane foam is first sprayed on the surface of the body where there is a possibility that a low temperature may propagate. Since the influence of the temperature of the skeleton at the site to be removed can be eliminated, a highly reliable external thermal insulation construction method can be provided.

According to the second aspect of the present invention, since the communicating foam is used, the expansion of the panel due to the foaming pressure and the dent of the panel due to the contraction of the foam can be effectively prevented.

According to the third aspect of the present invention, the use of the injection foam having a low reactivity makes it possible to effectively suppress the deformation due to the foaming pressure.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a method for external heat protection such as a refrigerated warehouse according to the present invention.

FIG. 2 is an explanatory view showing an external heat protection construction method according to the present invention.

FIG. 3 is an explanatory view of the same.

FIG. 4 is an explanatory view of the same.

FIG. 5 is an explanatory view showing a modified example of the external thermal insulation construction method.

FIG. 6 is an explanatory view showing still another modified example.

FIG. 7 is an explanatory view showing a conventional example.

FIG. 8 is an explanatory view showing another conventional example.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Concrete frame 2 Sandwich panel 3 Sprayed urethane foam 4 Communication foam 4 'Rigid urethane foam (low reactivity) 4 "Rigid urethane foam (blown)

Claims (4)

[Claims] 1. A method for externally preventing heat in a cold storage or the like in which a sandwich panel with an iron plate is installed on the outer surface of a skeleton and a foam excellent in heat insulation and self-adhesion is filled between the panel and the skeleton. A method for external heat protection in a cold storage warehouse or the like, characterized in that a foam is sprayed on the skeleton side in advance, and then a foam is filled between the sprayed foam and the sandwich panel. 2. The method according to claim 1, wherein a continuous foam having a closed cell ratio of 50% or less is injected and foamed as the foam to be filled. 3. The method according to claim 1, wherein a foam having a relatively slow reactivity with a cream time of 10 to 50 seconds and a rise time of 100 to 250 seconds is injected and foamed as the filling foam. External heat insulation construction method for refrigerated warehouse etc. 4. The method according to claim 1, wherein the foam is filled by blowing.