JPH09155251A - Inorganic fiber spray gun - Google Patents

Abstract

(57) Abstract: A discharge pipe 6 is attached to the tip of a supply hose of inorganic fiber material, and a plurality of first injection holes 7 and a plurality of second injection holes for injecting cement milk into the discharge pipe 6. And a hole 9 is provided, and the injection direction of the first injection hole 7 is set to the inner side of the discharge pipe,
It is characterized in that the injection direction of the injection hole 9 is in front of the discharge pipe. [Effects] Cement milk or water is sufficiently mixed with the inorganic fiber material through the first injection holes, and at the same time, the scattered inorganic fibers are eliminated. Further, by spraying cement milk or water directly on the wall surface or the steel frame through the second injection hole, it is possible to enhance the adhesiveness of the mixture of the inorganic fiber material and cement milk or the mixture of the inorganic fiber material and water. it can. Since the inorganic fibers do not fall off, work efficiency is significantly improved.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an inorganic fiber spraying gun.

[0002]

2. Description of the Related Art In order to improve fire resistance, there is a method of covering an iron frame or a wall with an inorganic fiber such as rock wool. For example, a concrete construction method is described in Japanese Utility Model Publication No. 2-31170, "Gun for spraying inorganic fiber material", and a gun for realizing the construction method is exemplified. FIG. 4 of the above publication is reproduced again in the following figure (however, the orientation and the reference numerals have been corrected).

FIG. 8 is a diagram showing a conventional inorganic fiber spraying gun. An inorganic fiber spraying gun 100 comprises an inorganic fiber blowing hose 101, a discharge pipe 102, a conduit 103 and an injection nozzle 104. In case of semi-dry method, hose 1
The rockwool is also sent together with air through 01, and the cement milk is sent through the conduit 103 to the injection nozzle 104, the rockwool is mixed with the cement milk at the outlet of the injection nozzle 104, and this mixture is discharged from the discharge pipe 102. Spray on the wall surface.

Although the gun 100 described above has a simple structure,
There is a problem that the cement milk is not sufficiently mixed with the inorganic fibers jetted from the discharge pipe, and therefore a part of the inorganic fibers scatter and the working environment is deteriorated. Therefore,
The improved guns shown in FIGS. 1 to 3 of the above publication are required. This improved gun aims at good mixing by injecting cement milk in a direction against the flow of inorganic fibers.

[0005]

However, even the improved gun described above has the following problems. There is a disadvantage that part of the cement milk collects at the bottom of the discharge pipe and drips from the tip of the discharge pipe. In both the gun 100 of FIG. 8 and the improved gun, the adhesion of the inorganic fibers on the wall surface is not good. This means that even inorganic fibers that are sufficiently moistened with cement milk are difficult to stick to dry walls. An example of an improved gun with a narrowed tip (Fig. 3)
Then, it is possible to prevent dripping from the tip, but this time a new problem occurs that the tip of the discharge pipe is clogged. Then, the objective of this invention is providing the inorganic fiber spraying gun which solved the above-mentioned subject.

[0006]

In order to achieve the above object, a first aspect of the present invention is to attach a discharge pipe to the tip of a supply hose of an inorganic fiber material, and to discharge a plurality of cement milk or water into the discharge pipe. It is characterized in that a first injection hole and a plurality of second injection holes are provided, the injection direction of the first injection hole is the back of the discharge pipe, and the injection direction of the second injection hole is the front of the discharge pipe.
Cement milk or water is sufficiently mixed with the inorganic fiber material through the first injection holes, and at the same time, the scattered inorganic fibers are eliminated. Further, by spraying cement milk or water directly on the wall surface or the steel frame through the second injection hole, it is possible to enhance the adhesiveness of the mixture of the inorganic fiber material and cement milk or the mixture of the inorganic fiber material and water. it can.

A second aspect of the present invention is characterized in that the main flow path of the discharge pipe is a long taper having a small taper ratio and a taper. Since it is tapered, the flow velocity is increased, the directivity of the injected inorganic fiber is improved, and the dripping of cement milk from the tip of the discharge pipe can be suppressed. Since the taper ratio is small and the diameter reduction is very gradual, there is no risk of clogging.

According to a third aspect of the present invention, a guide groove that extends in the axial direction is further formed in the main flow path of the discharge pipe, and the cement milk that runs along the guide groove and hangs from the tip of the discharge pipe is blown by the second injection hole. It is characterized by having done. Since the cement milk accumulated in the discharge pipe is collected in the guide groove and blown by the second injection hole, it is possible to sufficiently prevent the dripping of the cement milk from the tip of the discharge pipe.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a cross-sectional view of an inorganic fiber spraying gun (first embodiment) according to the present invention. The inorganic fiber spraying gun 1 includes a hose mounting portion 2 and a male socket 3
And the first annular groove 4 formed on the female side of the socket 3.
And the discharge pipe 6 inserted into the female side of the socket 3 through the O-rings 5 and 5, and the first injection holes 7 ... (... The same shall apply hereinafter.), The second annular groove 8, the second injection hole 9 extending from the second annular groove 8 to the tip, and the main flow that is the flow path in the discharge pipe 6. The passage 10, the tapered long taper 11 having a sufficiently loose taper formed on the inner peripheral surface of the main passage 10, the chamfered portion 12 formed at the tip of the discharge pipe 6, and the second annular groove at the base of the discharge pipe 6. And a ring 13 which is screwed on so as to cover 8.

The discharge pipe 6 preferably has an average inner diameter of 40 mm and a length in the range of 100 mm to 200 mm.
If it is less than 100 mm, the mixing of the inorganic fiber and the cement milk may be insufficient, and it may be difficult to grip during handling. Further, if it exceeds 200 mm, the flow path resistance increases, which may increase the load on the blower. The taper ratio of the long taper 11 ((large diameter-small diameter) / length) was 3%.

The first injection holes 7 ... are oriented in a backward direction, that is, in a direction against the flow of the inorganic fibers, and the cement milk supply pipe 15, the first valve 16, the first connection port 17, and the first injection port 7. Cement milk sent through the annular groove 4,
Spray "to the inorganic fiber". In addition, the second injection hole 9 ...
Is the cement milk supply pipe 15, the second valve 18, the second connection port 19 and the second
The cement milk sent through the annular groove 8 is jetted "towards the wall surface".

FIG. 2 is a front end view of an inorganic fiber spraying gun (first embodiment) according to the present invention, in which six second injection holes 9 ... It shows that they are arranged at equal pitches on concentric circles. The number of the second injection holes 9 ... Is arbitrary if the pitch is equal.

An inorganic fiber spraying gun having the above construction (first
The operation of the embodiment will be described below. FIG. 3 is a diagram showing the operating principle of a spraying apparatus equipped with an inorganic fiber spraying gun (first embodiment) according to the present invention.
2 is gradually loosened, and the fiber is sent to the inorganic fiber spraying gun 1 through the supply hose 24 by the force of the blower 23 (arrow). On the other hand, cement and water are put into a slurry tank 27 equipped with a stirrer 26, and the mixture is sufficiently stirred to obtain cement milk 28, and the cement milk is supplied by the pump 29 to the cement milk supply pipe 1
5, It sends to the inorganic fiber spraying gun 1 through the 1st valve 16 and the 2nd valve 18 (arrow,).

FIG. 4 is an operational diagram of the inorganic fiber spraying gun (first embodiment) of the present invention.
Indicates the flow of the first cement milk, and indicates the flow of the second cement milk. Furthermore, the "amounts" of the inorganic fiber, cement milk and the mixture at each point P1 to P7 are shown below. Cement milk is water mixed with cement at a ratio of 1: 2. P1; inorganic fiber = 6 P2; cement milk = 12 = (cement 4 + water 8) P3; primary cement milk = P2 cement milk 7
0 to 90% = 8.4 to 10.8 P4; secondary cement milk = 3 of P2 cement milk
0-10% = 3.6-1.2 P5; primary mixture = 14.4-16.8 P6; similar to P5, primary mixture = 14.4-16.8 P7; secondary mixture = 18 = ( Fiber 6 + Cement 4 + Water 8)

The state in the main position will be supplementarily described. P1: Dry inorganic fiber, which was sent by air. P5: Cement milk is mixed with the inorganic fiber. Cement milk begins to mix with the inorganic fibers. P6: The inorganic fiber and the cement milk are sufficiently mixed, the cement milk is attached to the surface of the inorganic fiber, and the inorganic fiber is in a wet state. Since P6 has a smaller diameter than P5, the flow rate of the mixture increases. P7: Cement milk from the second injection hole is directly on the wall surface 3
In step 1, the wall surface 31 is made wet. On the other hand, the primary mixture from the discharge pipe 6 collides with the wet wall surface and adheres due to the adhesive action of cement.

That is, the cement milk is divided into two parts, a part of which is mixed with the inorganic fiber and the rest is applied to humidify the wall surface 31 or the like. In addition, the second in P4
The amount of cement milk is 10% of P2 cement milk
When it was less than 1, the wettability of the wall surface was low and the adhesion of the inorganic fibers was insufficient. Also, 30 of P2 cement milk
If it exceeds%, the wall surface becomes too wet and the attached inorganic fibers run off. Therefore, the amount of the second cement milk is in the range of 10 to 30% of the total amount of cement milk.

FIG. 5 is another operation diagram of the inorganic fiber spraying gun (first embodiment) of the present invention. Only water is supplied to the cement milk supply pipe of the inorganic fiber spraying gun 1 of the present invention. There is technology. That is, in the figure, is a mixture of inorganic fiber and cement ,, is the first water, and is the second water. further,
The "amount" of the inorganic fiber, cement, water and mixture at each point P1 to P7 is shown below. P1; Mixture = 10 = Inorganic fiber 6 + Cement 4 P2; Water = 8 P3; Primary water = 70 to 80% of water of P2 = 5.6 to 6.
4 P4; secondary water = 30 to 20% of water of P2 = 2.4 to 1.
6 P5; primary mixture = 15.6 to 16.4 = inorganic fiber 6+
Cement 4 + water 5.6 to 6.4 P6; similar to P5, primary mixture = 15.6 to 16.4 P7; secondary mixture = 18 = (fiber 6 + cement 4 + water 8)

The state at the main position will be supplementarily described. P1: A mixture of dried inorganic fibers and dry cement (powder) is sent by air. P5: Add water to the mixture of inorganic fiber and cement. P6: The mixture of inorganic fibers and cement is sufficiently mixed with water, water adheres to the surface of the mixture, and the mixture becomes wet. Since P6 has a smaller diameter than P5, the flow rate of the mixture increases. P7: Water from the second injection hole directly hits the wall surface to wet the wall surface. On the other hand, the primary mixture from the discharge pipe 6 collides with the wet wall surface and adheres due to the adhesive action of cement.

That is, it is characterized in that water is divided into two parts, a part of which is used for humidifying the inorganic fiber material and the other part of which is used for humidifying the wall surface. The amount of the second water in P4 is
When the water content was less than 20%, the degree of wetness of the wall surface was small and the adhesion of the inorganic fibers was insufficient. In addition, the water of P2 30
If it exceeds%, the wall surface becomes too wet and the attached inorganic fibers run off. Therefore, the amount of the second water is 20 to 3 of the total amount of water.
The range is 0%.

FIG. 6 is a sectional view of an inorganic fiber spraying gun (second embodiment) according to the present invention. An inorganic fiber spraying gun 1A is the same as the inorganic fiber spraying gun 1 of the first embodiment. The only difference is that guide grooves 14 ... Are engraved on the inner surface of the main flow path 10, and the other components are designated by the reference numerals in FIG. FIG. 7 is a front end view of an inorganic fiber spraying gun (second embodiment) according to the present invention, in which six second injection holes 9 ...
Are arranged on a circle concentric with the inner peripheral surface of the discharge pipe 6 at equal pitches, and the guide grooves 14 ... Are exposed to each of the second injection holes 9.

The operation of the guide groove 14 will be explained. Although the first cement milk is mixed with the inorganic fiber and the mixing is sufficiently performed in the long taper portion, a part of the cement milk is accumulated at the bottom of the main channel 10. Sometimes. In FIG.
If 32 is cement milk accumulated at the bottom, it will drip from the tip of the discharge pipe 6 as it is. Therefore, we guide in the lower guide grooves 14, 14, 14 and immediately before hanging down,
It is to blow forward with cement milk from the second injection holes 9, 9, 9 in the vicinity.

[0022]

Embodiments of the present invention will be described below. Table 1 is a comparative test table of the inorganic fiber spraying gun 1 of the first embodiment of the present invention, the inorganic fiber spraying gun 1A of the second embodiment, and the conventional inorganic fiber spraying gun 100.

[0023]

[Table 1]

A coating layer obtained by spraying inorganic fibers together with cement milk onto the H-shaped steel web and flange was cut into a predetermined amount and placed in a drying oven at 105 ° C. for drying for 48 hours.
The water-removed product was weighed and the bulk ratio was determined. Example 1; When the inorganic fiber spraying gun 1 of the first example shown in FIG. 1 was used, the web was 0.34 to 0.39,
Flange is 0.34 to 0.36 with an average of 0.35
Met. Since the bulk ratio required for this type of construction is 0.34, the evaluation is ◯.

Example 2; When the inorganic fiber spraying gun 1A of the second example shown in FIG. 6 was used, the web was 0.3
4 to 0.46, the flange is 0.35 to 0.43,
Since the average was 0.39, the evaluation was ⊚. Comparative Example 1; Conventional inorganic fiber spraying gun 10 shown in FIG.
When 0 was used, the web had 0.32 to 0.35, the flange had 0.31 to 0.33, and the average was 0.33. Since the bulk ratio of 0.34 required for this kind of construction is not reached, the evaluation is x.

That is, Example 2 (second example) provided with the guide groove had the best result because the dripping of cement milk can be satisfactorily eliminated. However, the intended effect can be obtained even in the first embodiment (first embodiment) that does not include the guide groove.

The inorganic fiber material in claim 1 is an inorganic fiber or an inorganic fiber prepared by mixing cement in advance. Further, the number of the second injection holes is arbitrary. In the present embodiment, the second injection hole is opened by thickening the thickness of the discharge pipe and drilling it with a long drill. Therefore, the outer peripheral surface of the discharge pipe is smooth and easy to grip. However, for the purpose of cost reduction, a plurality of small-diameter pipes may be attached to the outer peripheral surface of the thin-walled discharge pipe, and the second injection holes (pipes) may be configured by these small-diameter pipes.

[0028]

The present invention has the following effects due to the above configuration. According to a first aspect of the present invention, a discharge pipe is attached to the tip of a supply hose of inorganic fiber material, and a plurality of first injection holes and a plurality of second injection holes for injecting cement milk or water are provided in the discharge pipe. Set the injection direction of the 1 injection hole to the back of the discharge pipe, and
It is characterized in that the injection direction of the injection hole is in front of the discharge pipe. Cement milk or water is sufficiently mixed with the inorganic fiber material through the first injection holes, and at the same time, the scattered inorganic fibers are eliminated. Further, by spraying cement milk or water directly on the wall surface or the steel frame through the second injection hole, it is possible to enhance the adhesiveness of the mixture of the inorganic fiber material and cement milk or the mixture of the inorganic fiber material and water. it can.

A second aspect of the present invention is characterized in that the main flow path of the discharge pipe is a long taper having a small taper ratio and a taper. Since it is tapered, the flow velocity is increased, the directivity of the injected inorganic fiber is improved, and the dripping of cement milk from the tip of the discharge pipe can be suppressed. Since the taper ratio is small and the diameter reduction is very gradual, there is no risk of clogging.

According to a third aspect of the present invention, a guide groove extending in the axial direction is further formed in the main flow path of the discharge pipe, and the cement milk flowing along the guide groove and hanging from the tip of the discharge pipe is blown by the second injection hole. It is characterized by having done. The cement milk collected in the discharge pipe is collected in the guide groove and blown through the second injection hole, so that the dripping of the cement milk from the discharge pipe tip can be sufficiently prevented and the working environment is improved. It

[Brief description of the drawings]

FIG. 1 is a sectional view of an inorganic fiber spraying gun (first embodiment) according to the invention.

FIG. 2 is a front end view of an inorganic fiber spraying gun (first embodiment) according to the present invention.

FIG. 3 Gun for spraying inorganic fibers of the present invention (first embodiment)
Of working principle of spraying device with

FIG. 4 Gun for spraying inorganic fibers of the present invention (first embodiment)
Action diagram

FIG. 5: Gun for spraying inorganic fibers of the present invention (first embodiment)
Another action diagram of

FIG. 6 is a sectional view of an inorganic fiber spraying gun (second embodiment) according to the present invention.

FIG. 7 is a front end view of an inorganic fiber spraying gun (second embodiment) according to the present invention.

FIG. 8: A diagram of a conventional inorganic fiber spraying gun

[Explanation of symbols]

1, 1A ... Inorganic fiber spraying gun, 6 ... Discharge pipe, 7 ... First injection hole, 9 ... Second injection hole, 10 ... Main flow path, 11 ... Long taper, 13 ... Guide groove, 24 ... Supply hose, 31 ...
Wall, 32 ... Cement milk.

Claims (3)

[Claims] 1. A discharge pipe is attached to the tip of an inorganic fiber material supply hose, and a plurality of first injection holes and a plurality of second injection holes for injecting cement milk or water are provided in the discharge pipe. The injection direction of the first injection hole is the back of the discharge pipe, the injection direction of the second injection hole is the front of the discharge pipe, and cement milk or water is mixed into the inorganic fiber material at the first injection hole, and the second injection hole An inorganic fiber spraying gun characterized in that cement milk or water is sprayed directly onto a wall surface or a steel frame. 2. The inorganic fiber spraying gun according to claim 1, wherein the main flow path of the discharge pipe is a long taper with a small taper ratio and a taper. 3. A structure in which a guide groove extending in the axial direction is further formed in the main flow path of the discharge pipe, and the cement milk dripping from the tip of the discharge pipe along the guide groove is blown by the second injection hole. The inorganic fiber spraying gun according to claim 2.