JPH0123626B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for forming a natural stone-like wall surface.

Natural stone is difficult to obtain at a low price, is heavy, and difficult to construct on walls, and so on, so methods for forming natural stone-like walls are widely used.

One of the methods often used is to expose natural stone grains on the wall, but in that case,
After applying a wall material made by mixing natural stone grains with mortar and troweling it onto the underlying surface, the surface is washed with water to remove the natural stone particles, or by spraying a wall material made by mixing natural stone grains with mortar onto the underlying surface. A method is generally used in which grains are partially exposed irregularly.

However, in the former case, the special process of washing out is required, which requires skilled techniques and is inefficient, and this method also has the disadvantage that uneven wall surfaces cannot be formed unlike spraying methods. However, in the latter case, there is a drawback that the natural stone grains are sprayed unevenly and the appearance is significantly degraded, and in both cases, it is impossible to cover the entire surface of the wall with natural stone grains. However, there are drawbacks such as being extremely inadequate as a natural stone-like wall surface and lacking in elegance.

The present invention has been researched and developed by improving the latter spraying method in order to solve the above problems.
The entire surface of the wall can be easily and reliably coated with natural stone particles, creating an almost perfect appearance of the natural stone wall.
The purpose of the present invention is to provide a method for forming a natural stone-like wall surface that can economically impart texture, has excellent weather resistance, fire resistance, etc., and has various features such as not inhibiting the air permeability of the underlying concrete. It is a thing,
Spraying mortar onto the base surface to form a mortar layer, and while the mortar layer is in an undried and wet state, providing a natural stone grain supply hopper on the surface thereof,
An air nozzle is arranged at the bottom of the hopper, and a natural stone particle ejection nozzle is arranged concentrically in front of the air nozzle at a required distance, and the air nozzle is disposed downwardly by covering only approximately the upper half of the through hole of the ejection nozzle. By spraying natural stone particles using a spray gun that is made up of an open half-cylindrical eaves integrally installed at the rear of the jet nozzle, the natural stone particles are press-fitted into the mortar layer surface with the natural stone particles biting into the surface. The present invention relates to a method for forming a natural stone-like wall surface, which is characterized in that the natural stone particles are firmly fixed to the surface of the mortar layer by adhesion and drying of the mortar, so that the surface is covered with the natural stone particles.

Next, examples of the present invention will be described.

Example (1) Composition of mortar; Portland cement 100
100 parts of Kansui stone, 10 parts of toning application material, 8 parts of anhydrous synthetic resin
(2) Natural stone grains: A mixture of crushed marble with an average particle size of 2MM to 6MM, taking into consideration several hues, and a small amount of water of approximately 9%. Prepare one with added.

First, as shown in Figure 1, the surface of the concrete base A at the site is cleaned, the water curing necessary for adhesion of mortar is sufficiently performed, and water is added to the mortar material in (1) above according to the usual method. The mortar mixture, which has been stirred and adjusted to an appropriate viscosity, is sprayed onto the base surface using an ordinary mortar spray gun in an irregular uneven pattern with a thickness of about 5 to 7 mm, as shown in the figure. A patterned mortar layer B is formed. next,
The natural stone particles C of (2) above are sprayed onto the surface of this mortar layer B in an undried and wet state using a spray gun G having a structure schematically shown in FIG. As shown in the figure, the natural stone particles are press-fitted into the mortar layer surface, and as the mortar dries, the press-fitted natural stone particles are firmly fixed to the mortar layer surface, and the surface is evenly covered with natural stone particles. After that, a silicone resin is applied to the surface as a water repellent to prevent the precipitation of alkali salts in the mortar and to prevent the adhesion of dirt, and the construction of the natural stone-like wall surface is completed.

In addition, when carrying out the present invention, since it is necessary to spray the natural stone grains sequentially and in a timely manner in accordance with the hardening speed of the mortar, the spraying surface is divided into a predetermined area using a joint bar. It is preferable to perform each spraying operation using joints, and by appropriately designing the sections using joints, it is possible to finish the wall surface with an elegant appearance.

In addition, a spray gun G for natural stone grains is shown schematically in FIG.
, 1 is a natural stone grain supply hopper, 2 is a grip part equipped with a compressed air injection trigger 3, 4 is an air nozzle, and 5 is a natural stone grain arranged concentrically on the front side with a required spacing from the air nozzle. This shows a spray nozzle, and the feature of this spray gun G lies in the structure of the spray nozzle 5.
is integrally equipped with a half-cylindrical eave body 7 at the rear, which covers only approximately the upper half of the through hole 6 and is open at the bottom. As the natural stone particles fall down along the upper part of the eaves without being hindered by the ejected air, the natural stone particles in the hopper 1 are surely allowed to fall to the lower part, and the natural stone particles can be sequentially and smoothly injected. Therefore, it is possible to completely cover the surface of the mortar layer with natural stone grains without unevenness.

According to the above embodiment, the natural stone grains C are easily and evenly press-fitted onto the uneven surface of the mortar layer B, and
Since the entire surface can be completely covered with natural stone grains C without unevenness in color tone, it has an excellent natural stone-like appearance.
It is possible to form a wall surface with a textured texture, and since each natural stone grain is strongly press-fitted into the mortar layer, it will not peel off after construction, and has better weather resistance and fire resistance than conventional methods. It turned out to be much better than that.

As is clear from the above detailed description, according to the present invention, the following effects that cannot be achieved by the conventional method of forming a natural stone-like wall surface by spraying described above can be achieved.

(1) All natural stone grains are press-fitted into the mortar layer surface, so they will not peel off after construction, and the elegant appearance and texture of the natural stone-like wall surface can be maintained for a long time.

(2) Since the entire surface of the mortar layer can be completely covered with natural stone particles, the above effects can be further improved.

(3) Once natural stone particles have been press-fitted onto the surface of the mortar layer, natural stone particles will not be attached again, so it is possible to finish the wall surface uniformly with no unevenness on the entire surface in terms of thickness and hue.

(4) Workability is extremely good and construction can be carried out efficiently and economically.

(5) Since the materials are mortar and natural stone, they not only have excellent weather resistance and fire resistance, but also are completely covered with natural stone particles, which prevents the precipitation of alkali salts as much as possible. This can be further improved by applying a water repellent.

(6) Compared to the conventional method, the amount of mortar applied is much smaller, so the permeability of the concrete base can be maintained and internal condensation does not occur.

(7) Since the spray gun configured as described above is used, the natural stone grains in the upper part of the eaves are not disturbed by the ejected air due to the eaves provided at the rear of the spray nozzle of the spray gun. As the eaves collapse along the upper part of the eaves, the natural stone particles in the hopper are reliably dropped to the lower part, and the natural stone particles can be smoothly and sequentially injected, thus making it possible to inject natural stone particles into the surface of the mortar layer. can be achieved reliably and beautifully without any unevenness.

[Brief explanation of drawings]

The drawings show examples of the present invention. Figure 1 is a cross-sectional view of a mortar layer sprayed onto a base surface, and Figure 2 is a cross-sectional view of a mortar layer with natural stone particles bitten into the surface of the mortar layer. Fig. 3 is a sectional view showing a preferred embodiment of a gun for spraying natural stone particles.
It is a sectional view with some parts omitted. A... Base surface, B... Mortar layer, C... Natural stone particles, G... Spraying gun, 1... Natural stone particle supply hopper, 4... Air nozzle, 5... Natural stone particle jetting nozzle, 6... Through hole, 7...Eave body.

Claims (1)

[Claims] 1. A mortar layer is formed by spraying mortar on the base surface, and while the mortar layer is in an undried and wet state, a natural stone grain supply hopper is provided on the surface thereof,
An air nozzle is arranged at the bottom of the hopper, and a natural stone particle ejection nozzle is arranged concentrically in front of the air nozzle at a required distance, and the air nozzle is disposed downwardly by covering only approximately the upper half of the through hole of the ejection nozzle. By spraying natural stone particles using a spray gun that is made up of an open half-cylindrical eaves integrally installed at the rear of the jet nozzle, the natural stone particles are press-fitted into the surface of the mortar layer. A method for forming a natural stone-like wall surface, comprising: adhering the natural stone particles to the surface of the mortar layer, and then drying the mortar to firmly adhere the natural stone particles to the surface of the mortar layer, thereby coating the surface with the natural stone particles. 2. The method for forming a natural stone-like wall surface according to claim 1, which comprises coating the surface of the mortar layer with natural stone particles and then further applying a water repellent to the surface. 3. The method for forming a natural stone-like wall surface according to claim 2, characterized in that a silicone resin is used as the water repellent.