JPS5912187Y2 - insulation wall structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement technique for conventional insulation wall structures.

In recent years, interest in heat-insulating wall structures has been increasing due to demands for improved livability, efficient use of energy, and need for resource conservation.

Particularly in the construction of new buildings in cold regions, the use of insulating wall structures is becoming an essential condition for financing, and therefore there is a lot of research on insulating wall structures.

For example, the technology closest to the present invention is JP-A-51-
There is a heat insulation method disclosed in Japanese Patent No. 8721.

The structures obtained using this construction method have excellent insulation properties, are simple to construct, and are economical, making them an excellent structure that is currently being widely adopted. There is still room for improvement in terms of providing long-term robustness that can withstand unexpected weather fluctuations such as changes in temperature and heat.

The present invention was developed in view of the current situation, and its purpose is to improve the thermal insulation wall structure obtained by conventional construction methods without sacrificing any of the advantages of the conventional construction method, and in addition: 1. to improve long-term practical use. , cracks in the mortar are less likely to occur.

2. Even if rainwater intrudes, there is very little reduction in insulation performance.

3 Efficiency during construction is improved, reducing construction costs and shortening the construction period.

The object of the present invention is to provide a heat insulating wall structure that has the following effects.

The content of the present invention will be explained in detail below using drawings and the like.

Figure 1 shows the heat insulating wall structure of the present invention.
The heat insulating wall structure shown in the No. 721 publication is shown as a cross-sectional view.

In Figures 1 and 2, the outline of the insulation wall structure is as follows:
A wall structure in which a foam board 3, a lath net 4, and a mortar layer 5 are arranged in this order on the studs 2 is formed by connecting the sides of the columns 1 and the studs 2.

This wall structure is constructed, for example, by nailing long foam boards 3, 3' onto one side of the pillars 1 and studs 2 with nails, rivets, etc.
This can be easily obtained by a construction method in which a mortar layer 5 is formed on the foam board 3 through a lath net 4, and then mortar is poured over the top of the foam board 3.

The difference between Fig. 1 and Fig. 2, that is, the main part of the present invention, is as follows.
The conventional foam board 3' is a normal foam board (a foam board whose surface is roughened with burst bubbles, etc.);
The foam board 3 of the present invention has a skin surface layer 6 at least on the surface in contact with the mortar layer (no burst bubbles are exposed on the surface).

Or a state where there is very little foam exposure) A foam board is placed.

The necessity of the foam board 3 having the skin surface layer 6 in the present invention is such that, as shown in Table 2, it exhibits significant improvement advantages in terms of construction efficiency, cracking of the mortar layer over time, retention of insulation properties over time, and other points. This is a surprising phenomenon that even those skilled in the art could not have predicted.

The reason for this is, for example, in the case of construction efficiency, where a large number of wide and long foam boards are handled, and the wind pressure generated during transportation and handling may cause deflection (the present invention is small), smoothness during handling ( Direct construction is the most important factor, such as the degree of ease of damage (the present invention is small) or the ease of damage (the present invention is small). This is thought to have affected the efficiency, and the difference in cracking over time is due to the mutual expansion of the materials due to the temperature difference in the conventional structure, where the mortar layer bites into the surface of the foam board and solidifies into one piece. Whereas the mortar side receives the difference in shrinkage, in the structure of the present invention, a large portion absorbs the difference in expansion and contraction between the materials as slippage at the interface between the foam board and the mortar layer, and a large stress is applied to the mortar layer. It is presumed that the difference in phenomena occurred because there was no such thing.

In addition, the presence of the skin surface layer shows great resistance to moisture that penetrates through the mortar layer and accumulates at the interface with the foam board, reducing the insulation properties of the foam board itself. It also effectively maintains long-term insulation and prevents rotting of pillars, foundations, etc.

Furthermore, there is no need to use washers when driving nails or rivets during installation, the number of cracks caused by nailing is significantly reduced, and the nail retention is improved, which cannot be overlooked.

The composite resin foam board referred to in this invention is a thermoplastic resin generally referred to as polyethylene, polystyrene, polyvinyl chloride, polypropylene, etc., mixed with a foaming agent (physical foaming agent, chemical foaming agent). , refers to a plate-like material with a high closed cell ratio that has been expanded to an expansion ratio of about 3 to 50 times.

In the case of the present invention, rigidity and heat insulation properties are extremely required, so in order to satisfy both of these requirements economically, polystyrene resins (polymers and copolymers with a styrene content of 50% or more, and It is best to use mixed resins).

The foamed board with a skin surface layer as used in the present invention refers to a foamed board that has a thin film on its surface to minimize the presence of broken bubbles.

This can be obtained, for example, by pressing the surface of the foam board with a guide before solidifying during extrusion foaming, or by pressing the surface of the foam board itself with a heating roller, or by pressing the surface of the foam board itself with a heated roller. It can also be obtained by laminating a resin film.

In this case, the density of the foam board up to a thickness of 3 mm from the surface having the skin surface layer is adjusted to be at least 1.1 times the density of the entire foam board.

If it is less than 1.1 times, it becomes difficult to cover the surface air bubbles in a broken package.

Further, the skin surface layer is disposed on one side, preferably both sides, of the foam board.

If it is one-sided, it will be troublesome to use the skin surface layer in contact with the mortar layer, so it is better to have the skin surface layer on both sides.

The comparative evaluation method and evaluation scale used in this invention will be explained below.

In addition, this evaluation method is used in order to unify the phenomenon as much as possible.
There are four ways to focus on and contrast the sources of differences.

(1) Construction efficiency: Selecting a pair of skilled carpenters, approximately 9
We measured the time required to finish a flat wall with an area of 150 m2 using foam board raw materials measuring 0 cm x 180 cm x 3 cm.
We evaluated its size.

(2) Cracking over time: The degree of cracking that occurred in a flat wall with an area of 150 m'' two years after completion of mortar construction was scored using the following scale.

(3) Sustaining thermal insulation properties over time: Two years after completion of mortar construction, cracks in the wall were destroyed, the foam inside was taken out, and the moisture content and thermal conductivity of the foam were measured. It is expressed as a rate of change from the value.

The water content was measured using ASTM-C-272, the thermal conductivity was measured using ASTM-C-518, and the water vapor transmission rate was measured using ASTM. -Compliant with E-96.

(4) Amount of damage: The amount of damage to the foam board that occurred when the foam board was carried in, moved, and nailed to finish a flat wall with an area of 150 m2 was evaluated.

Next, examples and comparative examples will be explained.

Examples and Comparative Examples Two experimental buildings with the same specifications and an outer wall area of approximately 150 m2 were constructed in the suburbs of Sapporo, and various experimental observations were continued for two years.

Table 1 shows the materials used and the outer wall structure, and Table 2 shows a comparison of the data obtained at the time of construction and two years later.

The present invention has the above-described structure, and is an excellent invention that can provide a heat insulating wall structure with less occurrence of cracks in the mortar portion and which maintains heat insulation performance at a lower cost than conventional construction costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an example of the heat insulating wall structure of the present invention, and FIG. 2 is a sectional view of a conventional heat insulating wall structure. 1... Column, 2... Stud, 3, 3'... Foam board, 4
... lath net, 5 ... mortar layer, 6 ... skin surface layer.

Claims (2)

[Scope of utility model registration request] (1) In a wall structure in which foam boards, lath mesh, and mortar layers are sequentially arranged on the sides of columns and studs,
A heat insulating wall structure in which the foam board is a composite or resin foam board having a skin surface layer at least on a surface in contact with a mortar layer. (2) The heat insulating wall structure according to claim 1, wherein the composite resin foam board is made of polystyrene resin.