JPH0231170Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a gun for spraying inorganic fiber materials that can be used in both dry and semi-wet construction methods.

[Conventional technology]

There are two methods of spraying inorganic fibers such as rock wool and asbestos onto steel frames and walls: a dry method in which water supplied from a conduit is sprayed and mixed with a mixture of inorganic fibers and cement sent through a discharge pipe; There is a semi-wet construction method in which cement milk supplied from a conduit is mixed and sprayed onto the inorganic fibers being fed through the pipe, and various types of spray guns have already been developed for this purpose.

Therefore, if this type of spray gun is roughly classified according to its form, as shown in FIG.
As shown in FIG. On the outer circumferential surface of the distal end of a discharge pipe 2 inserted into the distal end of a wind blowing hose 1 made of a fiber material, injection nozzles 4 each having a conduit 3 for guiding water or cement milk are arranged at equal intervals in the circumferential direction of the discharge pipe 2. There is a method in which a plurality of cylindrical inorganic fiber materials are provided and water or cement milk is injected from the outer circumferential surface of the cylindrical inorganic fiber material discharged from the discharge pipe. As disclosed in Japanese Utility Model Publication No. 52474 and Japanese Utility Model Publication No. 59-24384, as shown in FIG. At the same time, a plurality of injection holes 6 communicating with the inner wall of the discharge pipe from the outer cylinder 5 are arranged at equal intervals in the circumferential direction of the discharge pipe 2 and in the axial direction of the discharge pipe 2. A type installed at right angles to the discharge pipe and pressurized with water or cement milk into the inorganic fiber material moving inside the discharge pipe, or
Publication No. 11621, Publication No. 48-9658, Publication No. 11621, Publication No. 9658, Publication No. 11621
-44045, and as shown in Figure 7,
The plurality of injection holes 6 are provided at equal intervals in the circumferential direction of the discharge pipe 2 and diagonally toward the discharge port of the discharge pipe 2, and water or cement milk is pressurized into the inorganic fiber material moving inside the discharge pipe. There are things like this.

[Problem that the invention attempts to solve]

Conventional spray guns of this type have advantages and disadvantages depending on their structure, but when using the semi-wet construction method, the cement milk is not evenly distributed within the inorganic fiber material discharged from the discharge pipe, and it remains on the spraying surface. The material is laminated in layers, resulting in uneven specific gravity. Therefore, in order to equalize this and achieve a bulk specific gravity of 0.3 or more, which is set by the Ministry of Construction as a fireproof structure standard for sprayed rock wool coatings, the sprayed surface is further pressed with a trowel after the spraying process. It required work such as or,
Cement milk that does not mix with inorganic fibers often scatters and contaminates surrounding components, resulting in unfavorable conditions such as requiring curing.

In addition, when spraying using the dry method, the inorganic fiber material and water do not mix sufficiently, causing cement powder and powdered inorganic fibers to scatter and become floating dust, resulting in various negative effects such as deterioration of the working environment. was recognized.

That is, in the case of the spray gun shown in FIG. 4, cement milk is injected in a conical shape;
The inorganic fiber material was placed on the surface of the cone and spread, and the cement milk was not mixed into the inorganic fiber material, and when the spray gun was used in the dry method, almost the same results were obtained. . Furthermore, the fifth
In the case of the spray gun shown in the figure, water or cement milk covers the circumferential surface of the inorganic fiber material discharged from the discharge pipe in a cylindrical shape, and the core of the inorganic fiber material located inside is coated with water or cement milk. Difficult to penetrate and mix.

In the case of the spray gun shown in Fig. 6, the water or cement milk injected from the injection hole is immediately affected by the air blowing pressure of the inorganic fiber material, and the water or cement milk does not fully penetrate and mix into the inorganic fiber material. This phenomenon is almost the same in the case of the spray gun shown in FIG.

[Means for solving problems]

This invention involves fitting a discharge pipe on the outer periphery with an outer cylinder in which a series of conduits for guiding water or cement milk is fitted to the tip of an air blowing hose made of an inorganic fiber material, and a plurality of pipes connected to the inner wall of the discharge pipe from the outer cylinder to the inner wall of the discharge pipe. The injection hole is directed toward the back of the discharge pipe, and is bored at an angle oblique to the axis of the discharge pipe, and water or cement milk is sprayed in the direction opposite to the direction of movement of the inorganic fiber material. Eliminates uneven distribution of water or cement milk, and curves the outlet end of the discharge pipe inward to accelerate the spraying speed, increasing the spraying pressure on the spraying surface and increasing the specific gravity for finishing work with a trowel. We were able to solve the drawbacks of the conventional method, such as eliminating the

[Effect]

In this invention, the water or cement milk injection hole is directed toward the inner part of the discharge pipe made of inorganic fiber material and is bored at an angle inclined to the axis of the discharge pipe, so that the water or cement milk can be injected into the discharge pipe. The inorganic fiber material is injected diagonally from the front in the direction of travel of the inorganic fiber material, mixing and penetrating the inorganic fiber material as if it were piercing into the inorganic fiber material being blown by the wind, resulting in complete and uniform distribution.

Furthermore, in this invention, the tip of the discharge port of the discharge pipe is curved inward to increase the spray pressure on the spray surface, increase the bulk specific gravity of the spray surface, and to prevent water or cement milk from flowing from the discharge port end. It is also possible to prevent contamination of the floor surface etc. due to falling droplets.

〔Example〕

An embodiment of this invention will be described with reference to FIG.

11 is a wind blowing hose made of inorganic fiber material,
A discharge pipe 12 equipped with an outer cylinder 15 having a conduit 13 for guiding water or cement milk on the outer periphery is fitted to the tip of the hose 11, and a plurality of injection holes 16 communicating from the outer cylinder 15 to the inner wall of the discharge pipe. The discharge pipe 12
The case is shown in which a cylindrical ejection hole 16 is provided at an angle α of 45 degrees with respect to the axis XX of the ejection pipe 12 toward the inner part of the ejection pipe 12 .

The second embodiment shown in FIG. 2 has exactly the same structure as the embodiment shown in FIG. 1, except that the injection hole 16 has a truncated conical shape with a larger diameter on the inner wall side of the discharge pipe 12. It is.

Generally, when rock wool is used as an inorganic fiber material and spraying is carried out using a semi-wet method, cement milk mixed at a weight ratio of 1 part cement to 2 parts water is discharged at a rate of 5 kg of rock wool and 3.5 kg of cement milk per minute. It is normal to discharge and spray from a pipe, and when using the spray gun of the present invention, when using the semi-wet construction method, construction is usually performed in accordance with this standard. The cement milk injection hole 16 has a hole diameter of 2.0 mm or more.
3.2 mm, the number of injection holes is 6 to 8 evenly spaced in the circumferential direction of the discharge pipe, and the angle α with respect to the axis X-X of the discharge pipe 12 is in the range of 30 to 45 degrees, the best results can be obtained. It has been found.

As a result of the test, it is more preferable to make the injection hole 16 into a truncated conical shape as shown in FIG. 2, in which case the hole diameter on the inner wall of the discharge pipe is 1.2
It has been found that it is preferable that the angle of the discharge pipe 12 with respect to the axis XX is set to be 45 degrees or less and β 30 degrees or less.

The above description has been given using the semi-wet construction method as an example, but the spray gun of the present invention can also be used in the dry construction method, in which water is sprayed onto a mixture of inorganic fibers and cement while spraying onto steel frames and walls. However, it was confirmed that almost the same good results as the semi-wet method described above could be obtained.

Furthermore, when water or cement milk is injected into the inorganic fiber material, the weight increases due to moisture and the discharge speed from the discharge pipe 12 decreases.
As shown in FIG. 3, it is appropriate to make the inner wall surface at the tip of the discharge port of the discharge pipe 12 shown in FIGS. 1 and 2 into an inwardly curved surface 17 and to reduce the discharge port. The best results were obtained for curved surfaces with a radius of curvature of approximately 50 mm. In this case, it goes without saying that the tip of the discharge port of the discharge pipe 12 may be made into a curved surface facing inward on both the inner and outer wall surfaces, and the discharge port may be reduced.

Also, the spray gun of this invention was developed in 1978.
As shown in Japanese Utility Model Publication No. 123369 and Japanese Utility Model Publication No. 58-52474, an auxiliary hood of an appropriate form may be fitted to the outlet end of the discharge pipe 12.

[Effect of idea]

As described in detail above, the gun for spraying inorganic fiber materials of this invention has a discharge pipe on the outer periphery of which is connected a conduit for introducing water or cement milk to the tip of an air blowing hose made of inorganic fiber material. Along with fitting,
A plurality of injection holes leading from the outer cylinder to the inner wall of the discharge pipe are directed toward the inner part of the discharge pipe and are bored at an angle oblique to the axis of the discharge pipe, so that water or cement milk is injected in a direction opposite to the direction of movement of the inorganic fiber material. By spraying the mixture diagonally from the front, it penetrates into the blown inorganic fiber material as if it were piercing, and the mixture is evenly mixed and distributed, and the mixture is evenly sprayed on the sprayed surface for lamination. to form a sprayed surface without uneven specific gravity or delamination.

During spraying, the inorganic fiber material and water or cement milk are completely mixed, so there is a risk of deterioration of the working environment due to scattering of inorganic fibers and cement powder, generation of floating dust, scattering of cement milk, etc. There is no possibility of contamination of structural members such as walls.

However, when water or cement milk is mixed into the inorganic fiber material, the weight naturally increases due to wetting and the discharge speed from the discharge pipe decreases. By reducing the diameter of the outlet and increasing the spraying pressure on the spraying surface, the inorganic fiber material mixed with water or cement milk may fall without adhering to the spraying surface, or the desired bulk specific gravity may be reduced. In addition, the curved surface has a so-called draining effect to prevent droplets of water or cement milk from falling from the discharge port, and other incidental effects are obtained. It could have been done.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a gun for spraying inorganic fiber materials of the present invention, Fig. 2 is a front sectional view showing another embodiment, Fig. 3 is a front sectional view of the tip of the discharge pipe, and Fig. 4
Figures 7 to 7 are front sectional views of a conventional gun for spraying inorganic fiber materials. 1,11...Inorganic fiber material air blowing hose, 2,
12... Discharge pipe, 3, 13... Conduit, 4... Injection nozzle, 5, 15... Outer cylinder, 6, 16... Injection hole, 17... Curved surface.

Claims (1)

[Claims for Utility Model Registration] 1. A discharge pipe having an outer cylinder on the outer periphery in which a conduit for guiding water or cement milk is connected is fitted to the tip of an air blowing hose made of an inorganic fiber material, and A gun for spraying inorganic fiber materials in which a plurality of injection holes communicating with the inner wall of the discharge pipe are drilled toward the inner part of the discharge pipe at an angle oblique to the axis of the discharge pipe. 2. The gun for spraying inorganic fiber material according to claim 1, wherein the injection hole is cylindrical. 3. The gun for spraying inorganic fiber material according to claim 1, wherein the injection hole has a truncated conical shape with a larger hole diameter on the inner wall side of the discharge pipe. 4. The gun for spraying inorganic fiber material according to claim 1, wherein the discharge end of the discharge pipe is an inwardly curved surface.