JPS5817868B2 - Rapid construction method for base plates and walls using ALC plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a wall material for wooden buildings, etc., and a method of constructing the same, which is free from cracking, has a short construction period, has fire resistance,
Concerning construction methods for base plates and walls with excellent waterproof properties.

BACKGROUND OF THE INVENTION Lath mortar walls in wooden buildings and the like are widely used because they are inexpensive, have fireproof properties, and can provide large, clear walls without joints.

On the other hand, since mortar is applied to the mortar to the extent of 20%, cracks are likely to form due to the hardening and shrinkage of the mortar, and the wooden board used as the base has poor dimensional stability and expands and contracts repeatedly due to moisture, further aggravating the cracks.

The standard construction method for lath mortar is the installation of lath board, asphalt felt covering, metal lath installation, mortar undercoat, intermediate coat, and top coat.

In particular, the three times of mortar application, namely undercoating, intermediate coating, and topcoating, require a curing period of 2 to 3 weeks each, so it takes 1 to 1.5 months, which increases the construction period of wooden buildings etc. It is supposed to be long.

Recently, something similar to a mortar base board that is made of plywood with special mortar irregularities has been proposed, but since it is plywood itself, it cannot prevent expansion and contraction due to moisture, and in order to obtain fire resistance, it is necessary to use mortar. It is not an improvement on the drawbacks of the conventional lath mortar method, such as the need to apply more than 20 layers of lath mortar.

Also, something similar to a wooden wool cement board with a waterproof sheet pasted has been proposed.

This eliminates the need to apply a waterproof sheet later, but since it uses wooden pieces, it has poor dimensional stability and may warp due to moisture.
Because of its large expansion and contraction, it is unsuitable for use as a mortar base plate.

As mentioned above, in the conventional lath mortar construction method, there was no construction method that could shorten the construction period, prevent wall cracks, be waterproof, and be fireproof.

In response to this, thin ALC boards (autoclave-cured lightweight aerated concrete boards) whose interior is reinforced with reinforcing bars, wire mesh, etc., have recently become popular in the field of wooden construction as dry-type exterior wall materials that improve upon the shortcomings of the 5 lath mortar construction method. ing.

Since this has already been autoclaved in the factory, the expansion and contraction of the plate due to repeated curing and shrinkage, wetting and drying, and heat are extremely small, so no cracks will occur.

Furthermore, since no curing period is required on site, the construction period is also shortened.

The construction method is to cut it to match the shape of the building or the opening and fasten it to the studs or pillars with nails, tapping screws, etc. However, because there are reinforcing bars or lath mesh inside, special tools and special tools are required for cutting. Requires skill.

Furthermore, although the joints are waterproofed by sealing, there are cases where the joints do not appear to be tight.

A method similar to a synthetic fiber cheesecloth pasted on the surface of an aerated concrete board has also been proposed.

Although this is an improvement in terms of cutting workability, the synthetic fiber cheesecloth itself has a large elongation and cannot be used to effectively reinforce cellular concrete.

In addition, since it is not autoclaved, it undergoes large dimensional changes due to curing shrinkage, drying shrinkage, etc., and is not suitable as a base plate.

As mentioned above, even among dry construction methods, there has not been a method suitable for small-scale construction such as wooden houses that satisfies all aspects of construction period, performance, workability, and appearance.

The present invention solves all of these problems and provides an innovative base plate and base plate that is excellent in waterproofness and fireproofing properties, does not cause cracks, and can provide a mortar wall without joints in a short period of time. It is a construction method.

That is, the base plate of the present invention, which is made of unreinforced ALC with a thickness of 10 to 50 mm and has waterproof paper attached to one side and a net-like material attached to the other side, is strong against bending, impact, and other forces, and is resistant to expansion and contraction. Dimensional changes are very small, and there are no warps or curls.

Also, since the thickness is constant, it is suitable as a base for plastering walls with mortar, etc.

By attaching this to the building frame, a base with excellent surface accuracy is created, so when applying mortar, you can omit the undercoat and intermediate coat and simply apply a thin layer of topcoat to obtain a smooth wall.

This eliminates the occurrence of cracks due to hardening and shrinkage of the mortar, making it possible to omit major steps and shorten the construction period.

Since the base plate of the present invention itself has excellent fire retardant properties, the mortar referred to here is for surface finishing and is military equipment in terms of fire retardant performance.

Furthermore, even if the surface is finished with a synthetic resin material instead of mortar, there will be no problem in terms of fireproofing performance and there will be no problems such as the occurrence of cracks.

The ALC board used in the present invention is a non-reinforced board with a thickness of about 10 to 50 mm, without reinforcing bars, lath mesh, etc. inside, for ease of processing.

There was no base board made of aerated concrete board that was as thin as this and could be used as is.

In particular, thin unreinforced aerated concrete boards are easily broken when nailed to studs, rims, etc., and there are also problems in terms of wind pressure, handling strength, and waterproofing, so they have not been used in the past.

The present inventors solved these problems by using the AL
The problem was solved by pasting waterproof paper 2 on one side of the C board 1.

That is, by pasting waterproof paper on the surface of the ALC board,
It has a reinforcing effect against impact force and wind pressure load, and is also waterproof, making it a safer base plate.

This base plate is waterproof, fireproof, dimensionally stable, and lightweight.
, has the strength required for exterior wall boards, prevents cracking and chipping during construction, is easy to cut, and can significantly shorten the construction period.

Examples of the waterproof paper 2 used in the present invention include tar felt, asphalt felt, fiber-reinforced waterproof paper, and the like.

The base plate of the present invention is made of ALC as shown in FIGS.
This is a base board with a net-like material 3 pasted on the upper side of the board 1 (the surface where the waterproof paper 2 is not pasted), and it is more difficult to break even when nailed, making it easier to work.

These net-like materials 3 are adhered to the front side of the ALC board 1 in advance, but since they are covered with nets, they are firmly fixed between the ALC board 1 and the finishing material such as mortar or slag after construction, and are strong. It forms the outer wall.

The net 3 is a resin net, a synthetic fiber net, a glass fiber net, a cheesecloth, etc., and is formed by knitting, weaving, or bonding so-called fibers such as nylon, vinylon, polyester, vinylidene chloride, acrylic, etc. waterproof paper 2 on the back side of the ALC board 1 (the side to which waterproof paper 2 is pasted) as shown in Figure 3. A mesh material 3 is placed between the ALC board 1 and the
Structures with intervening materials are further reinforced and are strong as base plates for exterior walls.

Normally, when applying finishing materials such as mortar to ALC boards, primer treatment is required.

However, when waterproofing is applied to the base plate of the present invention as shown in the surface area 4 (indicated by parallel diagonal lines) of the ALC board in FIGS. Primer treatment is necessary because it prevents dryout and eliminates curing defects.

For the same reason, the workability of the trowel is also improved.

The number of on-site processes is reduced, further speeding up the work.

The waterproof texture referred to in the present invention is generally used as a waterproof treatment for aerated concrete boards, and refers to, for example, applying synthetic resin emulsion, synthetic resin dissolved in a solvent, tar, asphalt, silicone oil, etc., but especially acrylic. Synthetic resins such as ethylene-vinyl acetate and ethylene-vinyl acetate are preferred because they have the effect of controlling moisture and increasing adhesion when mortar is applied to the surface, and also serve to fix the net on the surface.

The features of the base plate and its construction method of the present invention can be summarized as follows.

1. Light and easy to handle.

2. Easy to cut.

(No special tools or skills required) 3. Construction period can be drastically shortened.

4. Excellent waterproofness.

5. No cracks occur.

6. Excellent fire resistance.

Common surface coating finishes include mortar, slag, and latex cement mortar, but synthetic resin-based spray tiles, thick/punched paint, and mastic paints can also be used.

This will be explained in more detail in the implementation flJ below.

Example 1 300 g/m of acrylic emulsion (manufactured by Asahi Kasei Industries, Ltd., Moltack) was applied to the surface of an unreinforced ALC board with dimensions of 60 x 90 cfrL and thickness of 2.5 cfrL.
Apply with a roller.

Next, it was covered with asphalt felt (manufactured by Dejima Roofing Co., Ltd., two-car lath felt, 3 kg-42 m), held at a hot plate temperature of 125° C., and held for 3 minutes to bond.

The base plates obtained in this way were lined up and nailed to the 450 mr IL pitch rim of a one-story wooden house with a floor area of about 25 m', and then white cement, mixed plaster, etc.
The daily crushed stones were mixed in a ratio of 1:2:4, mixed with water, and then applied with a trowel to finish the surface.

After 2 hours, the coated surface was scraped off with a Kenzan method tool to obtain a large wall with a ricin finish.

The construction period was one day, and no cracks were observed even after one year had passed since the construction of the corridor.

Example 2 Unreinforced A with dimensions 60-90CrfL and thickness 3.5CrIL
15 of the waterproofing agent Mortaku (manufactured by Asahi Kasei Industries) for the LC board.
% (resin content) solution for 10 seconds to create a waterproof texture.

Next, both sides of the ALC board were sandwiched between two 60 x 90 cIrL vinylon nets (manufactured by Kurabo Co., Ltd., Frenet V3300), and 20 cm of asphalt felt (manufactured by Dejima Roofing Co., Ltd., two-car lath felt) was placed on the back side. /m, dimensions 65 x 95 CrrL were stacked, placed in a hot press with a hot plate temperature of 90°C, and heated for 5 minutes to bond them.

The pressure is 1Kg/criY. The base board thus obtained was nailed to the rim (450 mm pitch) of a one-story wooden house having a floor area of about 25 m' with 5 crrL stainless steel nails.

The base boards were lined up against each other and nailed at 10 points per board.

The exterior wall surface thus obtained was finished by rolling out a layer of slag made by mixing ordinary Portland cement with water to a thickness of 3 mm using a rubber roller.The construction was completed in one day, and even after one year had passed since construction. No cracks were observed on the outer wall surface.

[Brief explanation of the drawing]

Figure 1 is an external view of the base plate of the present invention, Figure 2 is a sectional view of the base plate taken in the direction of the dotted arrow in Figure 1, and Figure 3 shows another example of application of the base plate of the present invention. FIG. 1... Unreinforced ALC board, 2... Waterproof paper,
3... Net. 4. Waterproof part.

Claims (1)

[Claims] 1' A 10-50mm thick unreinforced AI, C board (lightweight aerated concrete board cured with autogelape), with waterproof paper pasted on one side and a net-like material pasted on the other side. Base plate using ALC board. Z The base board according to claim 1, which has a net-like material interposed between the ALC board and waterproof paper. (a) The base board according to claim 1 or 2, wherein the ALC board is waterproofed in advance. A base board made of unreinforced ALC board (autoclave-cured lightweight aerated concrete board) with a thickness of 410 to 50, with waterproof paper on one side and a mesh material on the other side. A quick construction method for walls, which is characterized by fixing them so that they are in contact with the base of the walls, etc., and then applying a surface paint finish to the other side. The construction method according to claim 4, wherein a net-like material is interposed between the S ALC board and the waterproof paper. 5. The construction method according to claim 4, wherein the ALC board is waterproofed in advance. 7. The construction method according to claim 4, wherein the fastening in contact with the base is nailing. 8. The construction method according to claim 4, wherein the surface coating finish is a mortar finish.