JP3004569B2 - Insulation injection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for blowing a heat insulating material for producing a heat insulating wall used as a wall of a building.

[0002]

2. Description of the Related Art Conventionally, a heat insulating wall in which a fibrous heat insulating material such as glass wool, rock wool, or cellulose fiber is filled in a wall body has been widely used.

In the above-described heat insulating wall, the heat acting on the wall with time causes sinking of the heat insulating material filled in the wall. As a method for preventing such sinking of the heat insulating material, a method disclosed in US Pat. No. 4,487,365 or US Pat. No. 4,530,468 is known. In this method, a heat insulator is put into a blower installed at the construction site to disintegrate it, and when this is blown into the wall through a hose with a blower, a binder (adhesive ), And the fibrous heat insulating material is blown into the space inside the wall together with the binder.

[0004]

According to the above-mentioned method, the fibrous heat insulating materials are bonded to each other by the binder.
No sinking of the heat insulating material occurs, but it takes one day to dry the binder in summer and two days in winter to dry the binder. Further, the binder remains little by little in the nozzle for ejecting the binder, and the fibrous insulation is added to this. The material adheres, causing nozzle clogging.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, a method of blowing a heat insulating material according to the present invention is intended to provide a method of blowing a fibrous heat insulating material having an average fiber diameter of 5.7 μm or less into a space in a wall. The apparent density during blowing is 18.0k
and g / m ₃ or higher packing density is 45 kg / m ₃ or more and
And so, when the average fiber diameter is blown below the fibrous heat insulating material 4.0μm in the space of the wall body, the filling density of apparent density during blowing and 7.0 kg / m ₃ or more 3
It was set to 5 kg / m ₃ or more .

Here, the apparent density refers to the density when the fibrous heat insulating material is blown out into a free space, not a fixed space surrounded by a wall.

[Detailed Description of the Invention]

[Function] By reducing the average fiber diameter of the fibrous heat insulating material to be filled in the wall, even when blown at the same blowing density, the degree of entanglement between fibers becomes stronger than that of a fiber having a large average fiber diameter, thereby reducing vibration. The resistance to them increases.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a front view in which a part of a heat insulating wall according to the present invention is cut away, and FIG. 2 is a cross-sectional view in a state where a heat insulating material is filled in the wall body.

The heat insulating wall is filled with glass wool 3 as a heat insulating material in a space formed by sandwiching the partitions 1 between the panels 2. To fill the space with the glass wool 3, as shown in FIG. 2, one panel is removed, the portion is covered with a net 5, a hole is made in the net 5, and a hose extending from the blower through the hole. The glass wool 3 is blown into the space by compressed air with the end of 4 facing the filling space. After that, the removed panel is attached.

[0010] An experiment was conducted on the sinking of the heat insulating material by applying vibration to the heat insulating wall having the above configuration and the heat insulating wall manufactured by mixing the conventional binder. The heat insulating material used has a fiber diameter of 5.7 μm (trade name: LB0012) and 4.0 μm.
m (trade name: LY0012) glass wool was used.

Here, the vibration given to the building over time is mainly traffic vibration, and the upper limit of the vibration level of 80% based on a severe environment such as a highway is 50 dB.
Before and after, in the experiment, 68 dB was obtained by adding 5 dB as a vibration amplification amount by a house to the peak value of 63 dB.
In addition, the traffic volume of large vehicles causing vibrations on the main road was set at 67/10 minutes. In this case, assuming that the exposure time per one large vehicle is 2 seconds, the exposure time per day is 5.4 hours. That is, when vibration is continuously applied at 68 dB for 5.4 hours, the amount of vibration is one day.
By shaking dB continuously for 5.4 hours, it is 88 for 10 days.
By applying the dB continuously for 5.4 hours, the vibration amount corresponding to the vibration amount for 100 days is given to the heat insulating wall in a short time in this way. The subsidence of the material was examined. The experimental results are shown in the following (Table 1).

[0012]

[Table 1]

From the above (Table 1), it was confirmed that sinking did not occur in Samples 5 and 6 according to the conventional method in which the binder was first mixed, regardless of the average fiber diameter. Also,
For sample 3 not containing a binder, 70 m when the average fiber diameter was 5.7 μm and the packing density was 35 kg / m ³ .
m subsidence occurred. Therefore, the packing density is 45kg
/ M ³ , no sinking occurred as shown in Sample 4.

Further, as shown in Samples 1 and 2, when the average fiber diameter was 4.0 μm, no sinking occurred even if the packing density was 35 kg / m ³ irrespective of the vibration frequency. This is because if the fiber diameter is small, the number of fibers per unit volume increases and the fibers become entangled with each other even at the same packing density, and if the fiber diameter is small, the apparent density at the time of blowing is small. But the fiber diameter is 4.0
next ² repulsion 73.5kg / m in the case of [mu] m, fiber diameter is doubled near 38 kg / m ² when the 5.7 .mu.m, resistance to subsidence when this repulsive force is vibrated It is considered that

[0015]

As described above, in the present invention, since the fibrous heat insulating material is filled without using a binder, a curing period for drying the binder is not required, and the heat insulating material is ejected. No binder remains at the end of the hose, and therefore no insulation will adhere to the binder at the end of the hose and cause clogging.

Further, the fiber diameter of the fibrous heat insulating material is 5.7 μm.
In the following cases, the packing density is 45 kg / m ³ or more, and when the fiber diameter of the fibrous heat insulating material is 4.0 μm or less, the packing density is 35 kg / m ³ or more. Can be prevented. Further, when a fibrous heat insulating material having a fiber diameter of 5.7 μm or less is blown into the wall, the apparent density is set to 18.0 kg / m ³ or more, and the fiber diameter is set to 4. 0μ
m or less, the apparent density is set to 7.0 kg / m ³ or more, and the packing density is set to 45 kg / m ³ or more or 35 kg / m ^{3, respectively.}
The above heat insulating wall can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view in which a part of a heat insulating wall according to the present invention is cut away.

FIG. 2 is a cross-sectional view showing a state where a heat insulating material is filled in a wall body.

[Explanation of symbols]

 1. Partition, 2. Panel, 3. Thermal insulation, 4. Hose.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 7/76 B05D 1/02

Claims (2)

(57) [Claims] 1. An average fiber diameter of 5.7 μm in a space in a wall body.
m or less fibrous heat insulating material with apparent density of 18.0 kg / m
_{3. A} method for blowing heat insulating material, wherein blowing is performed together with compressed air without using a binder so that the packing density becomes 45 kg / m ₃ or more as ₃ or more. 2. An average fiber diameter of 4.0 μm in a space in a wall body.
m of fibrous heat insulating material with an apparent density of 7.0 kg / m ₃
As described above, a method of blowing a heat insulating material, wherein blowing is performed together with compressed air without using a binder so that a packing density is 35 kg / m ₃ or more .