JPS5947782B2 - Wall insulation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving insulation of walls, and particularly to a method for improving insulation of existing buildings.

Insulation renovation work for existing buildings involves insulating and renovating buildings that have already been completed or buildings that are already in use, and there has been no convenient construction method in the past.

Conventionally, fibrous materials such as waste paper pulp and glass fiber were injected into the interior of the wall, but as is well known, the interior of the wall contains wall components such as pillars, wooden boards, and rims, as well as electrical conduits and wires. There are cables, gas pipes, and other piping, and simply blowing in would leave some parts unfilled, resulting in insufficient insulation.

In addition, these fibrous materials have a low resistance to air circulation, and the air circulation reduces the heat insulating effect.

As a result of examining the actual situation of insulation construction methods for hollow walls using a method of press-fitting resin foam, the present inventor found that the process of foaming and curing of resin foam often generates a bad odor, so that it is not suitable for use inside existing buildings. It was said that injection work with resin foam was not possible, and injection work with resin foam was carried out only in newly constructed buildings.

In view of the above-mentioned circumstances, the inventors of the present invention investigated the insulation method that can be applied to existing buildings, and found that the hollow part of the lower tier was filled with urea-formaldehyde resin foam by using holes provided at intervals of 200 to 1000 mm as injection holes. fill more sequentially,
The present invention was achieved by discovering that the problems of the conventional method described above can be solved by smoothing the inflow holes with water-based putty after filling.

That is, the present invention provides that, inside an existing wooden building having a hollow wall, holes are made at intervals of 200 to 1000 mm on at least one side of the wall having a hollow portion, and the holes are used as injection holes to inject 4 kg. Bulk specific gravity is 0 at injection pressure below /cmG
．． 02 to 0.1 urea-formaldehyde resin foam is injected into the adjacent hole to the extent that the resin foam reaches the next injection hole, and the same process is repeated at the next injection hole, and this process is repeated for the remaining injection holes. This is a wall insulation method that is characterized by sequentially filling the hollow parts starting from the lower level, and after filling, filling the injection holes back and smoothing the surface with water-based putty.

In the above-mentioned invention, the reason why the injection hole is drilled only inside the building is to avoid rainwater leakage and to avoid destroying the waterproofing work that is always done on the outer wall by drilling the hole. .

A hollow part of the wall, usually with a diameter of about 10 to 30 mm, is used as an injection hole for urea-formaldehyde resin foam (hereinafter referred to as foam) in the wall surface that requires insulation in buildings that require insulation renovation. Drill a hole to reach the.

Domestic buildings generally have several studs inside the walls.

If the distance between the studs is 1000 mm or less, one or two injection holes are made between the studs.

That is, the injection holes are opened in the vertical direction (in the vertical direction of the wall) with an interval of 200 to 1000 mm between the holes.

Further, when the distance between the studs exceeds 1000 mm or in a hollow wall where no studs are attached, one or more injection holes are made.

If the distance between the holes is less than 200 mm, the foam may overflow from the adjacent hole before the hollow part of the wall is filled, contaminating the construction site and making construction difficult.

The method for injecting the foam is as follows.

For example, when the foam is injected through one hole and the foam reaches the next hole, the injection is stopped and the foam is moved to the next hole and the injection is started again.

By doing this, the foam that is press-fitted later will spread into the other foam while biting into the foam that was injected earlier.

(See Figure 1). By repeating the method described above, it is possible to fill the entire wall while firmly interlocking the foam members.

Specifically, the following method is convenient.

In other words, the method of pouring into a wall where the studs are 1000 mm or less in length is as follows: 1) A method of moving one step laterally while pouring.

This method is convenient because the studs can be used as partitions during injection, and there is no need to strictly control the curing time of the foam.

For example, start from the bottom injection hole and stop pouring when the foam reaches the hole next to the top, which is separated by studs.

Move to the bottom injection hole and start injection.

As before - stop pouring when the foam reaches the next hole and transfer it to the side.

Repeat this operation until all the holes at the bottom are injected.

Return to the original position, move to the hole one level above (next to the top), and inject using the same method as in the bottom row.

In this way, inject from bottom to top, and when you reach the top, use the following method.

In areas where the walls reach the attic, it is preferable to continue pouring until the foam reaches the attic.

In addition, if the upper part of the wall is blocked by beams or frame materials and there is no place for the foam to escape, approximately 300 m
It is preferable to make holes with a diameter of 10 mm or less at positions within 1 mm.

This hole can also be used as a hole for checking filling.

That is, the foam is injected until it overflows from the hole used to confirm filling.

Furthermore, this hole also acts as an air vent hole during injection.

If there is no hole, the wall will swell during injection, which is the worst problem.
Sometimes walls are destroyed.

Next, 2) the method of moving in the vertical direction while injecting is a convenient method when the curing time is short, for example, can be controlled to about 30 seconds or less.

That is, when the foam reaches the hole next to the top from the bottom row for the first time, the injection is stopped, and the injection is resumed after moving to the hole next to the top.

Repeat this to fill the entire wall.

When injecting into the second hole, follow the method described above.

The injection method for walls without studs or walls with studs exceeding 1000 mm is the same as for walls with studs less than 1000 mm.
are almost the same.

That is, during injection, when the foam reaches the holes adjacent above and next to the side, the injection is stopped, and the foam moves to the hole next to -L or next to the side and injected again.

Fill the entire wall with this repeat, and when pouring into the top hole, follow the method described above.

The injection pressure of the foam is 4 kg/crriG or less.

If it is larger than this, it may overflow from the injection hole or destroy the wall.

The foam that can be used in the present invention has a relatively short curing time, contains little moisture, and can be easily foamed, and a urea-formaldehyde resin foam is used.

Further, it is desirable that the resin foam contains less than 10 kg of water per m2 of wall area.

If there is too much moisture inside the wall, the wood that makes up the wall may rot or mold may form.

The bulk specific gravity of the foam at the time of injection is in the range of 0.02 to 0.1, and the bulk specific gravity after drying is usually 0.005 to 0.015.
The range is .

The curing time of the foam is arbitrarily determined by injection conditions such as the volume of the wall space, the injection flow rate, and the spacing between injection holes.

In the present invention, the curing time is preferably within 1 minute.

From the viewpoint of work, it is convenient to determine the injection flow rate so that the filling time per injection hole is 5 to 60 seconds.

After filling, refill the injection hole.

Water vapor permeable materials are suitable as backfilling materials.

Although regular plugs such as cork posts and wooden stoppers can be used, it is more preferable to use an irregularly shaped material that can be deformed to fit the shape of the hole.

Among the amorphous materials, particularly preferred are hardened and expansible materials that do not suffer from shrinkage cracks.

For example, water-based paste I, which is a hardening material mainly composed of gypsum.
・can be conveniently used as a hardening and expanding substance.

After refilling, smooth the top of the hole with water-based putty.

That is, it is finished with a hard inorganic water-based paste, generally known as water-based putty.

When finishing with such an aqueous paste, a beautiful finish can be achieved when applying surface decoration.

Smooth finishing using water-based paste is not just a one-time job.
.

It is advisable to refinish once the aqueous paste has dried.

By refilling the injection hole and treating the surface with the aqueous paste in this way, the concentration of odor substances generated from the foam leaking into the room becomes extremely low, while the drying of the foam: It is preferable because it progresses at almost the same speed as the one without hole filling.

This completes the wall insulation work, but in buildings used for residential purposes, additional wall decoration (hereinafter referred to as interior decoration) is usually performed.

In this case, commonly used interior materials such as paint, wallpaper, wall cloth, vinyl chloride cloth, fiber walls, etc. can be used as the interior materials, and the interior construction method may be any ordinary construction method.

Interior work can be continued immediately after the insulation work is completed, but for interior materials with high water vapor permeation resistance, such as PVC cloth 1.1 aluminum lining cloth and zinc oil paint, it should be done after the moisture content of the wall has decreased. It's amazing.

The present invention can be applied to any hollow walls of existing wooden buildings having hollow walls, and has a very wide range of applications.

Furthermore, it can be applied without any problems even if the structure of the wall changes in various ways, such as a framed wall such as the 2x4 construction method, a solid wall, a large wall, etc.

In addition, in insulation work, the present invention pushes a foam with good insulation performance into an existing hollow wall, so there is no need for extra space indoors or outdoors, and the internal volume of the room is reduced. There is no problem of the outer circumference protruding beyond the site boundary.

Since holes are drilled in the wall on the outside of the building, there is no problem of water leakage even in areas with a lot of rain, and there is no need for construction work to shut off the rain.

Foam does not create dust and does not make the work environment worse, unlike when fibrous materials are blown into the material.

Furthermore, it does not harm the health of workers, and unlike glass fibers, there is no need to worry about it touching the skin.

In the construction method of the present invention, the work progresses in chronological order, including drilling, pouring, and filling, which saves time and waste.

In addition, if there are people living in the room where the work is being performed,
You can temporarily move to another room while you are working, and then return to the same room as soon as the work is finished.

In addition to these numerous advantages, another great advantage of the present invention is the economical advantage of low construction costs.

From the above, it will become clear that the present invention is extremely useful as a heat insulation construction method.

Next, the present invention will be further explained with reference to Examples.

Example 1 The present invention was used to carry out insulation work on the solid walls of a residential house where studs are located at intervals of 455 mm.

The wall was constructed of a lathpod plaster coated wall on the inside and a waterproof sheet, lath net, and mortar coated wall on the outside, and the thickness of the hollow part between the inner wall and the outer wall was 45 mm.

In the inner wall, the lowest injection hole was drilled in the middle of the studs at a position 300 mm from the floor surface, and thereafter injection holes with a diameter of 22 mm were drilled upward at intervals of 450 mm.

In this way, injection holes were made throughout the inner wall.

The urea-formaldehyde resin foam is made by adding a foaming agent to an aqueous solution of the 6-acid catalyst obtained as follows, blowing air into it to form a cream puff-like foam, and adding urea-formaldehyde to this foam.
The formaldehyde resin liquid was mixed to form a foam.

The bulk specific gravity of this foam is about 0.06, and after drying,
The bulk specific gravity was approximately 0.01.

The amount of acidic catalyst was adjusted to give a cure time of about 20-25 seconds.

This foam was ejected from an injection nozzle at a pressure of about 1 kg/cJG, and was injected and filled into the hollow part of the wall through the injection hole.

All the injection holes at the bottom were injected.

The bottom injection took about 25-30 seconds per injection hole.

Next, it was injected into the injection hole on the crotch.

In this case, the foam reached the adjacent hole above in an injection time of about 15 seconds per injection hole.

After that, the robot moved horizontally one after another, filling injection holes at the same height, and then moving to the injection holes at the next level.

When the injection nozzle is removed from the injection hole when transferring from one injection hole to the next injection hole, the press-fitted foam is pushed back and comes out of the injection hole by about 10 to 20 mm.

By observing the foam pushed out, it was confirmed that the quality of the foam was stable.

The time required to inject the entire 9 m2 wall in this way was 20 minutes.

As the foam dried, a deformalinization reaction occurred and formalin was generated, so it was backfilled immediately after injection.

As a hardened and expandable substance for filling the holes, a water-based paste was used, which was made by adding water to DS Pond (a water-based putty containing hemihydrous gypsum as the main component, a product of Mitsui/Toatsu Chemical Co., Ltd.) and kneading it hard.

40 parts by weight of tap water was added to 100 parts by weight of DS pound, and the mixture was mixed using a small stirrer.

Form this aqueous paste I into a ball with a diameter of about 25 mm, pour it into the injection hole, and scrape off the excess with a spatula.

I used water-based putty to smooth out the top of the hole.

The water-based putty is Joint Compound All Purpose (2
A water-based paste was used, which was made by adding water to a putty whose main component is water gypsum (product of United Gibsum Co., Ltd.) and kneading it hard.

Joint compounder: 55 parts by weight of tap water was added to 100 parts by weight of Randall Purpose, and the mixture was kneaded using a small stirrer.

After this aqueous paste I had dried, another aqueous paste was applied and smoothed with a trowel.

One day later, the concentration of formaldehyde was measured above the hole using a dairy formaldehyde detector tube, but no formaldehyde was detected.

For comparison, when the concentration of formaldehyde was measured in a portion where no holes were filled, a concentration of 4 ppm was detected.

The permissible concentration of formaldehyde is 2 ppm, and the method of the present invention fully satisfies the permissible concentration of formaldehyde.

It is clear that the method of the present invention is much more effective in preventing formaldehyde than in areas where holes are not filled, and as a result, the inner wall injection method of resin foam has become possible.

On the day the invention was implemented, the residents were able to lead a normal life without having to move elsewhere.

[Brief explanation of the drawing]

FIG. 1 is a partial main view of a wall into which resin foam has been injected. FIG. 2 is a section of a section perpendicular to the wall of a wall injected with resin foam. 1 is an injection port, 2 is a stud, 3 is an inner wall of the building, 4 is an outer wall of the building, 10 is a resin foam, and 20 is an interface between the resin foams.

Claims (1)

[Claims] 1 Inside an existing wooden building with hollow walls,
200-1 on at least one side of the wall with a hollow part
Holes are drilled at intervals of 0.000 mm, and these holes are used as injection holes with a bulk specific gravity of 0.02 at an injection pressure of 4 kg/cm G or less.
~0.1 urea-formaldehyde resin foam is injected into the adjacent hole to the extent that the resin foam reaches the next hole, and the same process is repeated for the next injection hole, and the process is repeated for the remaining injection holes to form the lower row. A method for insulating walls that is characterized by filling the hollow parts sequentially, filling the injection holes back, and smoothing the surface with water-based putty.