JP2007061758A - Spraying apparatus and spraying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spraying apparatus and a spraying method capable of jetting an inorganic fiber and cement milk in completely mixed state. <P>SOLUTION: The spraying apparatus comprises a conveyer hose 1 for conveying an inorganic fiber toward the tip end and a nozzle 2 connected to the tip end in the downstream side of the conveyer hose 1 and equipped with a main jetting hole 21a for jetting the inorganic fiber. An injection part 3 in a middle of the hose for injecting at least one of water W and cement milk C inside from a side of the conveyer hose 1 is formed near the tip end part of the conveyer hose 1 and at least one of water W and cement milk C is mixed with the inorganic fiber and sent to the nozzle 2 by air current inside of the conveyer hose 1 downstream of the injection part 3 in a middle of the hose and the resulting mixture is jetted through the main jetting hole 21a of the nozzle 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to improvement of a spraying apparatus and spraying method for spraying inorganic fibers such as rock wool onto a building structure.

JP 2000-153187 A Japanese Patent Laid-Open No. 7-91062

  2. Description of the Related Art Conventionally, there is a spraying device for spraying inorganic fibers such as rock wool (rock wool) in a defibrated state to a building structure for the purpose of improving fire resistance. This is for spraying from a nozzle with high-pressure air in a state where inorganic fibers and cement milk are mixed, and for adhering this mixture to a framework, a ceiling surface, a wall surface, or the like of a building structure.

  As an example of this spraying device, there is an “inorganic fiber spraying gun” described in Patent Document 1. This relates to a nozzle attached to the tip of a hose, and has a main passage and an outward injection nozzle. In the main passage, inorganic fiber and cement milk carried by the air flow are mixed and injected. Is. On the other hand, only cement milk is jetted from an outer jet nozzle provided so as to surround the outside of the main passage.

  However, in such a nozzle structure, the inorganic fiber and the cement milk are jetted in an insufficient state. Therefore, there was a possibility that the inorganic fiber that could not be mixed with cement milk would fall without adhering to the building structure. In some cases, the falling inorganic fibers may reach about 10% of the supplied amount. In addition, since the inorganic fibers that did not adhere to the building structure float in the air, the visibility has deteriorated and the cleaning burden has increased. Moreover, since it was necessary to wear a dust mask at the spraying construction site, it was difficult to perform other work within the same site while performing this spraying operation.

  Note that some of the applicants of the present application have proposed a mechanism for collecting and reusing the dropped inorganic fibers in the invention described in Patent Document 2, which drastically solves the above problem. It wasn't something to do.

  This invention solves said subject by providing the spraying apparatus and spraying construction method which can be injected in the state which mixed the inorganic fiber and cement milk completely.

  In order to solve the above-described problem, the invention according to claim 1 of the present application is directed to a spraying device 10 for spraying inorganic fibers R such as rock wool against a building structure. The transport hose 1 transported in the distal direction, and the nozzle 2 connected to the downstream distal end of the transport hose 1 and provided with a main injection hole 21a for injecting the inorganic fiber R are provided on the transport hose 1 side. A hose section injection portion 3 for injecting at least one of water W and cement milk C from the inside to the inside is provided at a portion near the tip of the transport hose 1, and is downstream of the hose section injection portion 3. At least one of the water W and the cement milk C and the inorganic fiber R are mixed and sent to the nozzle 2 by the air flow inside the transport hose 1 on the side, from the main injection hole 21 a of the nozzle 2. Providing a spray apparatus which is characterized in that what is Isa.

  Moreover, the invention according to claim 2 of the present application is characterized in that the hose section injection portion 3 is provided at a distance of 1 m or more and 5 m or less from the tip portion of the nozzle 2. A spraying device is provided.

  In the invention according to claim 3 of the present application, the hose section injection portion 3 is 20 times from the tip of the nozzle 2 with reference to the inner diameter of the transport hose 1 at the position where the hose section injection portion 3 is provided. The spraying device according to claim 1, wherein the spraying device is provided at a distance of 100 times or less.

  In the invention according to claim 4 of the present application, the nozzle 2 includes the main injection hole 21a and a sub injection hole 22a that injects at least one of water W and cement milk C. The sub-injection hole 22a is opened at the tip of the nozzle 2 or inside the passage 21 to which the main injection hole 21a belongs, and the inorganic fiber R, the cement milk C, and the water W, or The spraying device according to any one of claims 1 to 3, wherein the inorganic fiber R and the cement milk C are mixed and sprayed onto a building structure.

  Further, in the invention according to claim 5 of the present application, a defibrating device 41 and a blower 42 are provided on the proximal end side of the conveying hose 1, and the defibrating device 41 is an inorganic material such as rock wool. In order to defibrate the aggregate of the fibers R to a size that can be conveyed by an air flow, the blower 42 generates an air flow for feeding the defibrated inorganic fibers R into the conveyance hose 1. And at least one of a water hose 61 for supplying water W and a cement milk hose 51 for supplying cement milk C is connected to the hose section injection portion 3. The nozzle 2 is connected to at least one of the cement milk hose 51 and the water hose 61 so that at least one of the cement milk C and the water W is jetted from the sub-injection hole 22a. In addition, a cement mixer 52 and a cement milk pump 53 are provided on the base end side of the cement milk hose 51, and the cement mixer 52 mixes cement and water to obtain cement milk C. The spray according to claim 4, wherein the pump for cement milk 53 is for pressurizing the cement milk C to be sent to the hose 51 for cement milk. Providing equipment.

  Moreover, invention of Claim 6 of this application uses the spraying apparatus 10 in any one of Claims 1-5, and sprays inorganic fiber R, such as rock wool, with respect to a building structure, It is characterized by the above-mentioned. Provide spraying method.

  According to the first to third aspects of the present invention, the hose section injection portion 3 is provided near the tip of the transport hose 1, and the air flow inside the transport hose 1 on the downstream side of the hose section injection section 3 is provided. Thus, at least one of water W and cement milk C and inorganic fiber R are mixed and sent to nozzle 2, so that at least one of water W and cement milk C and inorganic fiber R are mixed. Can be sprayed in a sufficiently mixed state, and this can greatly reduce the amount of inorganic fibers R falling without adhering to the building structure, and the scattered inorganic fibers The amount of R could be drastically reduced. As a result, it is possible to work with a good field of view, reduce the burden of cleaning, and it is also possible to work without a dust mask, contributing to a significant improvement in work efficiency at the spray construction site. Was made.

  In the inventions according to claims 4 and 5 of the present application, the inorganic fiber R, at least one of water W and cement milk C are mixed in the middle of the transport hose 1 and supplied from the nozzle 2 to this. Since at least one of the cemented milk C and the water W is mixed and sprayed onto the building structure, at least one of the inorganic fibers R, the water W and the cement milk C is used. One is thoroughly mixed in the hose. Moreover, at the stage of adhering to the building structure, at least one of the cement milk C and the water W covers the mixture of the inorganic fibers R, the water W and the cement milk C from the outside. Thus, a good adhesion state can be maintained.

  Moreover, invention of Claim 6 of this application was able to provide the spray construction method which has said effect.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a spraying apparatus according to the first embodiment of the present invention, and FIG. 2 is a schematic diagram showing the configuration of the spraying apparatus according to the second embodiment. FIG. 3 is a cross-sectional view showing the configuration of the hose and nozzle of this example.

The basic structure of the spraying apparatus 10 of this example is shown in FIGS. As in the prior art, each path has a path for supplying inorganic fibers R such as rock wool on an air flow, a path for supplying cement milk C, and a path for supplying water W, and the paths merge in the middle. Thus, the inorganic fiber R, the cement milk C, and the water W can be mixed.
In addition, although not shown in figure, the path | route which supplies the inorganic fiber R, and the path | route which supplies the cement milk C merge without providing the path | route which supplies the water W, and the inorganic fiber R and the cement milk C are combined. What can be mixed may be used.

  First, the path for supplying the inorganic fiber R is connected to the transport hose 1 in which the inorganic fiber R is transported in the tip (downstream) direction by the air flow, and the downstream tip of the transport hose 1 to construct the inorganic fiber R. It has what has the nozzle 2 for injecting toward a structure. The length of the transport hose 1 is in a practical range of 50 m to 200 m. The conveyance hose 1 used in this example has a length of 50 m. The inner diameter is 50 mm at 20 m near the distal end, and the inner diameter is 65 mm at 30 m near the proximal end.

  As shown in FIG. 3, the nozzle 2 includes a passage 21 communicating with the transport hose 1 inside. The tip of the passage 21 is opened as a main injection hole 21a. The nozzle 2 of this example is provided with a sub-injection hole 22a in addition to the main injection hole 21a, which will be described later.

As shown in FIGS. 1 and 2, a defibrating device 41 and a blower 42 are provided on the proximal end side of the transport hose 1. The defibrating device 41 is for defibrating the aggregate of inorganic fibers R to a size that can be conveyed by air flow, and is provided with mechanical defibrating means such as a rotary blade inside. is there. The blower 42 is for generating an air flow for feeding the defibrated inorganic fiber R to the transport hose 1. As the blower 42, a conventional blower 42 can be appropriately selected and used. In this example, an air volume of 3 to 4 m ³ is used, and the injection pressure is 0.7 MPa.
Thereby, the inorganic fiber R defibrated by the defibrating device 41 is placed on the air flow sent from the blower 42, the inorganic fiber R is conveyed through the conveyance hose 1, and is ejected from the main injection hole 21 a of the nozzle 2. it can.

On the other hand, the path for supplying cement milk C has a hose 51 for cement milk.
A cement mixer 52 and a cement milk pump 53 are provided on the base end side of the cement milk hose 51. The cement mixer 52 is for mixing powdered cement and water to form liquid cement milk C, and the cement milk pump 53 is for sending the cement milk C to the cement milk hose 51. It is what makes pressure. In this example, the mixing ratio of cement and water is 1: 2, but can be changed as appropriate. In this example, the supply amount of the inorganic fiber R and the cement milk C is 6: 4 by weight.

The above-mentioned merging of the respective paths is performed at the hose section injection section 3 provided near the tip of the transport hose 1, or the hose section injection section 3 and the tip of the nozzle 2 or the inside of the passage 21. Among these, the water hose 61 is connected to the side surface of the conveyance hose 1 in the first embodiment shown in FIG. Moreover, in 2nd Embodiment shown in FIG. 2, the hose 51 for cement milk is connected. As shown in FIGS. 1 and 2, a water tank 62 and a water pump 63 are provided on the proximal end side of the water hose 61. Although the weight ratio of water in the water W supplied from the water hose 61 and the cement milk C supplied from the cement milk hose 51 is 1:10, this value can be changed as appropriate.
In the first embodiment, since water W is supplied into the hose and cement milk C is not supplied, there is an effect that the concern that the cement milk is clogged in the hose can be solved.

  The hose section injection part 3 is as shown in FIG. 3 and includes a pipe member 31 and a distribution member 32. The pipe member 31 is inserted into a portion where the transport hose 1 is interrupted, and in this example, the outer diameter is 50 mm which matches the inner diameter of the hose 1. An injection hole 33 is provided on the inner peripheral surface. This injection hole 33 may be any as long as it can smoothly inject water W or cement milk C. In this example, the injection holes 33 are through holes having a diameter of 1 to 3 mm provided at 4 to 10 positions at equal intervals in the circumferential direction. As shown in FIG. 3, it is provided with an angle of about 45 ° toward the downstream direction of the air flow. The injection direction (in other words, the direction of the injection hole 33) may be directed to the downstream side as described above, may be directed to the upstream side, and is substantially orthogonal to the air flow. However, it can be implemented with appropriate modifications.

  The distribution member 32 is a hollow cylindrical body provided so as to surround the outer periphery of the tube member 31. The distribution member 32 is for evenly distributing the water W or cement milk C supplied from the connected hoses 51 and 61 to the injection holes 33 of the pipe member 31. In this example, the outer diameter is set to 75 mm, and the water hose 61 or the cement milk hose 51 can be connected to the outer peripheral surface, and both 61 and 51 can be joined together and connected. In addition, an O-ring 34 is provided at a portion that comes into contact with the outer peripheral surface of the pipe member 31 to prevent leakage. Further, the pipe member 31 and the distribution member 32 can be disassembled during cleaning.

  In addition to this example, the hose section injection portion 3 has, for example, an injection hole 33 provided directly on the side surface of the transport hose 1 and a distribution member 32 so as to cover a portion where the injection hole 33 is provided. However, the present invention can be implemented in various forms.

  If the distance between the tip of the nozzle 2 and the hose section injection part 3 is too small, the water W and the cement milk C are not well mixed with the inorganic fiber R, and if too large, the inorganic fiber R and Under the influence of the viscosity of the mixture with water W or cement milk C, the momentum of jetting is reduced. Therefore, it is desirable to determine the optimum value in consideration of the conveyance hose 1, the nozzle 2 and other piping resistance and the capacity of the blower 42. Specifically, the position of the hose section injection portion 3 in the path for supplying the inorganic fiber R is a distance of 1 m to 5 m, more preferably 1 m to 4 m from the tip of the nozzle 2. In the expression based on the inner diameter of the transfer hose 1 at the position where 3 is provided, the distance from the tip of the nozzle 2 is 20 times to 100 times, more preferably 20 times to 80 times. In the case of this example, since the transport hose 1 is interrupted as described above and the hose section injection section 3 is inserted, the inner diameter of the transport hose 1 is the tube member 31 of the hose section injection section 3. It refers to the inner diameter of the connected transport hose 1 immediately upstream or downstream.

  Here, since the flow of the inorganic fibers R in the air flow is in a turbulent state inside the transport hose 1, the water W or the cement milk C is injected into the hose by the hose section injection unit 3, so Water W or cement milk C can be well mixed with the fiber R. In the past, since the respective paths were overlapped in the nozzle, there was a possibility that the inorganic fiber R was jetted with insufficient mixing. However, in the present invention, turbulence occurs in the hose and Since the distance from the section injection | pouring part 3 to the main injection hole 21a of the nozzle 2 can fully be ensured, after injection, the quantity of the inorganic fiber R which falls without adhering to a building structure is about 1/10 of the past. Can be significantly reduced.

  Next, in the first embodiment shown in FIG. 1, a cement milk hose 51 is connected to the nozzle 2. Further, in the second embodiment shown in FIG. 2, a water hose 61 is connected to the nozzle 2. In the second embodiment, the water hose can be implemented without connecting 61. Although not shown, the cement milk hose 51 is connected to the hose section injection portion 3 as in the second embodiment, and the cement milk hose 51 is also connected to the nozzle 2. Also good. That is, when a hose is connected to the hose section injection unit 3 and the nozzle 2, the combination of substances supplied at each location is water W, cement milk C (first embodiment), cement milk C, There are three types of water W (second embodiment), cement milk C and cement milk C.

  The nozzle 2 includes a sub-injection hole 22a for injecting water W or cement milk C in addition to the main injection hole 21a. And in the nozzle 2 of this example, the sub injection hole 22a is provided so that it may surround the circumference | surroundings of the main injection hole 21a, as shown in FIG. The cement milk hose 51 or the water hose 61 is connected to the side surface of the nozzle 2, and the cement milk C or water W passes through the sub passage 22 inside the nozzle 2 and is jetted from the sub injection hole 22 a.

  In addition, in order to exhibit the effect which drops said inorganic fiber R rapidly more effectively, after the injection from the nozzle 2, the sub injection hole 22a outside the flow of the injection material from the main injection hole 21a. It is desirable to determine the positions of the main injection holes 21a and the sub injection holes 22a so that the injection flow is present, that is, injection is performed in a state of being wrapped from the outside.

  Further, in this example, the main injection hole 21a and the sub injection hole 22a are each opened to the outside of the nozzle 2. However, the present invention is not limited to this, and the sub injection hole 22a belongs to the main injection hole 21a. It is good also as what was opened by the channel | path 21. FIG. Moreover, it is good also as what injects what mixed water W and cement milk C from this sub injection hole 22a.

  Next, since the applicant of the present application conducted an actual machine test for the examples in which the position of the hose section injection portion 3 was variously changed, the results are shown in Tables 1 and 2. Table 1 is according to the first embodiment shown in FIG. 1, and Table 2 is according to the second embodiment shown in FIG. In this test, each of the examples in which the distance from the tip of the nozzle 2 of the hose section injection portion 3 is 1 m, 2 m, 3 m, 4 m, and 5 m, and the inorganic fiber R and the cement milk C are mixed in the nozzle. This was performed using a conventional product of the type.

  First, generation | occurrence | production of the dust after injection was confirmed visually and evaluated relatively. "X" in the table indicates that a large amount of dust was generated to the extent that the operator must wear a mask, "△" indicates that dust was generated to the extent that it would be better to wear the mask, and "○" Indicates that almost no dust was generated, and “◎” indicates that no dust was generated. In this test item, in the first embodiment, the distance of 1 m to 5 m is a range that can be used comfortably, and particularly preferable results were obtained at the distance of 2 m to 3 m. In the second embodiment, the distance of 2 m to 5 m is a range that can be used comfortably, and particularly preferable results are obtained at a distance of 3 m to 5 m.

  Next, the amount of the inorganic fiber R after injection dropped onto the floor surface was visually confirmed and relatively evaluated. In the table, “x” indicates that a large amount of dropping was confirmed, “Δ” indicates that dropping was confirmed, and “◎” indicates that no dropping was confirmed. As a result of this test, in the first embodiment, particularly preferable results were obtained at distances of 1 m to 3 m. In the second embodiment, particularly preferable results were obtained at distances of 2 m to 4 m.

  Next, the proportion of the inorganic fibers R exposed on the surface of the mixture of the inorganic fibers R and the cement milk C in the state of adhering to the building structure after injection was visually confirmed and evaluated by area ratio. Whereas the conventional product has an exposure of about 50%, in the first embodiment, the product having a distance of 1 m to 5 m is used, and in the second embodiment, the product having a distance of 2 m to 5 m is 5 to 10 m. % Exposure and most of the inorganic fibers R can be buried in the cement milk C, and it was confirmed that the mixture can be more firmly attached to the building structure.

It is the schematic which shows the structure of the spraying apparatus which concerns on 1st Embodiment of this application. It is the schematic which shows the structure of the spraying apparatus which concerns on 2nd Embodiment of this application. It is sectional drawing which shows the structure of the hose and nozzle of this example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Spraying apparatus 1 Conveyance hose 2 Nozzle 21 Passage 21a Main injection hole 22a Sub injection hole 3 Hose section injection part 41 Defibration apparatus 42 Blower 51 Cement milk hose 52 Cement mixer 53 Cement milk pump 61 Water hose C Cement milk R Inorganic fiber W Water

Claims (6)

In a spraying device (10) for spraying inorganic fibers (R) such as rock wool against a building structure,
A transport hose (1) in which the inorganic fibers (R) are transported in the distal direction by an air flow;
A nozzle (2) provided with a main injection hole (21a) for injecting inorganic fibers (R), connected to the downstream end of the transport hose (1);
A hose section injection portion (3) for injecting at least one of water (W) and cement milk (C) from the side of the transfer hose (1) is provided at the tip of the transfer hose (1). It is provided in the side part,
At least one of water (W) and cement milk (C) and inorganic fibers (R) are formed by the air flow inside the transport hose (1) on the downstream side of the hose section injection section (3). A spraying device characterized by being mixed, sent to the nozzle (2), and sprayed from the main injection hole (21a) of the nozzle (2).   The spraying device according to claim 1, wherein the hose section injection part (3) is provided at a distance of 1 m or more and 5 m or less from the tip of the nozzle (2).   The hose section injection section (3) is 20 times or more and 100 times or less from the tip of the nozzle (2) with reference to the inner diameter of the transport hose (1) at the position where the hose section injection section (3) is provided. The spraying device according to claim 1, wherein the spraying device is provided at a distance. Said nozzle (2) is provided with said main injection hole (21a) and the sub injection hole (22a) which injects at least any one of water (W) and cement milk (C). ,
The sub-injection hole (22a) is opened at the tip of the nozzle (2) or the passage (21) to which the main injection hole (21a) belongs.
Inorganic fiber (R), cement milk (C), and water (W), or inorganic fiber (R) and cement milk (C) are mixed and injected to the building structure. The spraying device according to any one of claims 1 to 3, wherein A defibrating device (41) and a blower (42) are provided on the base end side of the transport hose (1),
The defibrating device (41) is for defibrating an aggregate of inorganic fibers (R) such as rock wool into a size that can be conveyed by airflow,
The blower (42) is for generating an air flow for feeding the defibrated inorganic fiber (R) to the transport hose (1),
At least one of a water hose (61) for supplying water (W) and a cement milk hose (51) for supplying cement milk (C) is supplied to the hose section injection portion (3). One is connected,
The nozzle (2) has a cement milk hose (51) and a water hose (61) so that at least one of cement milk (C) and water (W) is injected from the sub-injection hole (22a). And at least one of
A cement mixer (52) and a cement milk pump (53) are provided on the base end side of the cement milk hose (51).
The cement mixer (52) is for mixing cement and water into cement milk (C),
The spraying device according to claim 4, characterized in that the cement milk pump (53) is for pressurizing the cement milk (C) to be sent to the cement milk hose (51).   The spraying construction method characterized by spraying inorganic fiber (R), such as rock wool, with respect to a building structure using the spraying apparatus (10) in any one of Claims 1-5.

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