JP2021011742A - Water jet gun - Google Patents

Abstract

To provide a water jet gun capable of speedily and securely removing an object to be removed which sticks on a constituent member of a building in a narrow space.SOLUTION: A water jet gun 3 comprises: a rotary unit 10 which is connected to a supply device 2 supplying high-pressure water; outside piping 20 which is fitted to the rotary unit 10; flexible inside piping 30 which is provided rotatably inside the outside piping 20, and connected to the supply device 2; a nozzle 40 which is fitted atop of the inside piping 30; and an air motor 50 which rotates a base end side of the inside piping 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a water jet gun that injects water at high pressure to remove asbestos-containing materials.

Conventionally, asbestos-containing materials may be sprayed and adhered to constituent members such as curtain walls and beams constituting a building. When dismantling or renovating such a building, it is necessary to remove the asbestos-containing material sprayed on the constituent members.
For example, it is conceivable that a worker manually strips the asbestos-containing material using a tool such as a scraper. However, for example, when removing the asbestos-containing material sprayed on the back surface of the metal curtain wall, the gap between the metal curtain wall and the outer peripheral pillar is narrow, so that a worker cannot enter the gap and asbestos is manually removed. It may not be possible to remove the contained material.
In order to solve this problem, when the building frame is demolished, an external scaffolding is erected on the outside of the building, and this external scaffolding covers the part to be demolished to form a curing space, and asbestos is contained in the curing space. A method of removing the material together with the metal curtain wall can be considered. However, in this case, since a large curing space including the external scaffolding is formed, there is a problem that the dismantling cost increases and the construction period becomes long.

On the other hand, a method has been proposed in which water is sprayed from a nozzle onto an asbestos-containing material adhering to a building component to remove the asbestos-containing material (see Patent Documents 1 to 3).
However, in the methods shown in Patent Documents 1 to 3, even if an attempt is made to remove the asbestos-containing material adhering to the constituent members of the building in a narrow space, the nozzle may not reach the asbestos-containing material.

JP-A-2010-222786 Japanese Unexamined Patent Publication No. 2011-125805 Japanese Unexamined Patent Publication No. 2016-56521

An object of the present invention is to provide a water jet gun capable of quickly and surely removing an object to be removed adhering to a building component in a narrow space.

As a method for removing an object to be removed such as an asbestos-containing material, the present inventors provide a water jet gun with an outer pipe and a flexible inner pipe, and fix a nozzle at the tip of the inner pipe. Focusing on the point that water can be ejected from the nozzle at high pressure and the object to be removed can be stripped off by rotating the base end side of the inner pipe with a rotary drive device while supplying water to the inner pipe at high pressure. , The present invention has been reached.
The water jet gun of the first invention (for example, the water jet gun 3 described later) is a water jet gun that injects water at a high pressure, and is a supply device for supplying water at a high pressure (for example, a supply device 2 described later). The main body (for example, the rotary unit 10 described later) connected to the main body, the outer pipe attached to the main body (for example, the outer pipe 20 described later), and the supply device rotatably provided inside the outer pipe. A flexible inner pipe (for example, the inner pipe 30 described later) connected to the inner pipe, a nozzle fixed to the tip of the inner pipe (for example, a nozzle 40 described later), and a base end side of the inner pipe. It is characterized by including a rotary drive device for rotating (for example, an air motor 50 described later).

According to the present invention, the water jet gun is provided with an outer pipe and an inner pipe, and a nozzle is fixed to the tip of the inner pipe. Therefore, by supplying water to the inner pipe at high pressure and rotating the inner pipe with a rotation drive device, the nozzle can be rotated and water can be injected from this nozzle at high pressure. As a result, it is possible to easily reach the object to be removed such as asbestos-containing material through the bent pipe and the nozzle in a very narrow space such as a gap between the curtain wall and the outer peripheral pillar.
In addition, since the nozzle is rotated by a rotation drive device, a nozzle with a simple structure and a small outer diameter can be used as compared with a nozzle that rotates by water pressure, and the nozzle can be passed through a narrower space. ..

The water jet gun of the second invention is characterized in that the tip surface of the nozzle is provided with an injection port (for example, an injection port 41 described later) forming a predetermined angle forward with respect to the rotation axis. And.

According to the present invention, since the injection port forms a predetermined angle toward the front with respect to the rotation axis, when the nozzle is arranged to face the removal target and rotated, water is circularly formed from the nozzle to the removal target. Since the injection area is secured to some extent, the object to be removed can be quickly and surely removed.

The water jet gun of the third invention is characterized in that the outer pipe is a bent pipe.

According to the present invention, since the outer pipe is a curved pipe, even if the narrow space in the building has a complicated shape such as bending or winding, the nozzle is removed through the curved pipe in this space. Since it easily reaches the vicinity of the object, the object to be removed can be reliably removed.
At this time, since the inner pipe has flexibility, even if the inner pipe is rotated in the curved outer pipe, the inner pipe is flexibly deformed and smoothly rotates while following the shape of the outer pipe.

The water jet gun of the fourth invention is characterized in that it is used for removing asbestos-containing material adhering to the inside of a building.

According to the present invention, the asbestos-containing material adhering to the inside of the building can be quickly and surely removed by the water jet gun.

According to the present invention, it is possible to provide a water jet gun capable of quickly and surely removing an object to be removed adhering to a building component in a narrow space.

It is a schematic diagram which shows the structure of the asbestos removal system which used the water jet gun which concerns on one Embodiment of this invention. It is a side view of the water jet gun of FIG. It is a side view (the 1) of the bent pipe of the water jet gun of FIG. It is a side view (No. 2) of the bent pipe of the water jet gun of FIG. It is a side view (No. 3) of the bent pipe of the water jet gun of FIG. It is a flowchart of the asbestos removal method using the water jet gun of FIG.

The present invention is a water jet gun. The water jet gun is provided with an outer pipe and a flexible inner pipe, a nozzle is fixed to the tip of the inner pipe, and a rotary drive device is connected to the base end side of the inner pipe.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing the configuration of an asbestos removal system 1 to which the water jet gun 3 according to the embodiment of the present invention is applied. FIG. 2 is a side view of the water jet gun 3.
The asbestos removal system 1 removes asbestos-containing materials by injecting water at a high pressure. The asbestos removal system 1 includes a supply device 2 that supplies water at a high pressure (for example, 100 MPa to 200 MPa), and a water jet gun 3 that injects water supplied from the supply device 2.

The water jet gun 3 is rotatably provided inside the rotary unit 10 as a main body connected to the high-pressure hose 4 of the supply device 2, the outer pipe 20 attached to the rotary unit 10, and the outer pipe 20 to supply the water jet gun 3. It includes an inner pipe 30 connected to the device 2, a nozzle 40 fixed to the tip of the inner pipe 30, and an air motor 50 as a rotation drive device for rotating the base end side of the inner pipe 30.
The rotary unit 10 includes a suction pipe 11 to which the high-pressure hose 4 of the supply device 2 is connected, and a discharge pipe 12 connected to the suction pipe 11. The discharge pipe 12 is rotatable about the central axis.

The air motor 50 is attached to the rotary unit 10. A hand valve 52 and an air compressor 53 are connected to the air motor 50 via an air hose 51. The air motor 50 rotationally drives the discharge pipe 12 by supplying compressed air from the air compressor 53.

The outer pipe 20 is made of stainless steel, and can be mounted by appropriately selecting from, for example, three types of bent pipes 20A, 20B, and 20C. The curved pipes 20A and 20B have a crank shape, and the curved pipes 20C have a curved shape (see FIGS. 3 to 5).
The inner pipe 30 is connected to the discharge pipe 12 of the rotary unit 10. The inner pipe 30 is a flexible high-pressure hose that is rotatably held by the outer pipe 20 by a hose guide 31 so as to hardly come into contact with the inner surface of the outer pipe 20.

The nozzle 40 is fixed to the inner pipe 30, and has an outer diameter of, for example, about 26 mm, which is small. On the tip surface of the nozzle 40, one injection port 41 is arranged at a predetermined angle θ (for example, 8.7 °, 4.3 °) toward the front with respect to the rotation axis S. In this embodiment, one injection port 41 is provided, but the present invention is not limited to this, and a plurality of injection ports 41 may be provided.
The inner diameter of the injection port 41 is, for example, 0.35 mm. By reducing the inner diameter of the injection port in this way, the amount of water used can be reduced while maintaining the injection pressure, and the injected water can be easily recovered.

The operation of the nozzle 40 is as follows.
By driving the air motor 50, the discharge pipe 12, the inner pipe 30, and the nozzle 40 rotate. In this state, when water is supplied by the supply device 2 at a high pressure (for example, 170 MPa), the nozzle 40 injects water from the injection port 41 while rotating. At this time, since the injection port 41 is arranged at a predetermined angle θ with respect to the rotation axis S, water is ejected in a circular surface with respect to the removal target. The amount of water used at this time is low (for example, about 3 L / min).

A procedure for removing the asbestos-containing material as an object to be removed adhering to the narrow space 60 in the building by using the above asbestos removal system 1 will be described with reference to the flowchart of FIG.
As shown in FIGS. 3 to 5, a space between the curtain wall 70 and the vertical member 80 and the outer peripheral pillar 90 is assumed as a narrow space 60 in the building. Bent corners 71 are formed at both ends of the curtain wall 70 in the horizontal direction, and an asbestos-containing material is also attached to the inside of the corners 71. Further, the vertical member 80 is a lip channel steel, and an asbestos-containing material is also adhered to the inside of the vertical member 80.

In step S1, the bent pipes 20A to 20C are appropriately selected and attached to the water jet gun 3, and then the bent pipes 20A to 20C are inserted into the narrow space 60 through the gaps on both sides of the outer peripheral pillar 90. The nozzle 40 is arranged inside the inside corner 71 of the curtain wall 70 or near the asbestos-containing material inside the vertical member 80.
In step S2, the supply device 2 and the air motor 50 are driven to inject water at a high pressure from the nozzle 40, and the asbestos-containing material is stripped from the curtain wall 70 and the vertical member 80.
In step S3, the stripped asbestos-containing material and the water sprayed from the nozzle 40 are recovered by a vacuum device or the like. Specifically, the asbestos-containing material and the water sprayed from the nozzle 40 are temporarily received by a saucer (for example, a curing sheet or a temporary material) installed below the asbestos-containing material. At this time, since the amount of water ejected from the nozzle 40 is low (3 L / min), most of the water is adsorbed by the asbestos-containing material, but if water remains, it is absorbed by a water absorption mat or a waste cloth. to recover.

According to this embodiment, there are the following effects.
(1) The water jet gun 3 was provided with the outer pipe 20 and the inner pipe 30, and the nozzle 40 was fixed to the tip of the inner pipe 30. Therefore, by rotating the inner pipe 30 with the air motor 50 while supplying water to the inner pipe 30 at a high pressure, the nozzle 40 can be rotated and water can be injected from the nozzle 40 at a high pressure. As a result, the asbestos-containing material can be easily reached through the bent pipes 20A to 20C and the small nozzle 40 in a very narrow space 60 such as a gap between the curtain wall 70 and the outer peripheral pillar 90.
Further, since the nozzle 40 itself is rotated by the air motor 50, the nozzle 40 having a simple structure and a small outer diameter can be used as compared with the nozzle of the type that rotates by water pressure, and the nozzle 40 is passed through a narrower space. be able to.

(2) Since the injection port 41 forms a predetermined angle θ forward with respect to the rotation axis S, when the nozzle 40 is arranged to face the asbestos-containing material to be removed and rotated, the asbestos from the nozzle 40 Since water is jetted to the containing material in a circular shape and a certain amount of jetting region is secured, the asbestos-containing material can be quickly and surely removed.

(3) Since the outer pipe 20 is a bent pipe 20A to 20C, the nozzle 40 is an asbestos-containing material through the bent pipe 20A to 20C through the narrow space 60 even if the narrow space 60 in the building has a complicated shape. Asbestos-containing material can be reliably removed because it easily reaches.
At this time, since the inner pipe 30 has flexibility, even if the inner pipe 30 is rotated in the curved outer pipe 20, the inner pipe 30 is flexibly deformed and follows the shape of the outer pipe 20. It rotates smoothly.

(4) If asbestos-containing material adheres to the curtain wall 70 or vertical member 80 of the building to be demolished or repaired, this does not have to be removed from the building together with the curtain wall 70 or vertical member 80. Since only the asbestos-containing material can be directly peeled off from the curtain wall 70 and the vertical member 80, the asbestos-containing material can be removed in a short period of time and at low cost.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the range in which the object of the present invention can be achieved are included in the present invention.

1 ... Asbestos removal system 2 ... Supply device 3 ... Water jet gun 4 ... High pressure hose 10 ... Rotary unit (main body) 11 ... Suction pipe 12 ... Discharge pipe 20 ... Outer pipe 20A, 20B, 20C ... Bent pipe 30 ... Inner pipe 31 Hose guide 40 ... Nozzle 41 ... Injection port 50 ... Air motor (rotary drive device) 51 ... Air hose 52 ... Hand valve 53 ... Air compressor 60 ... Narrow space 70 ... Curtain wall 71 ... Inside corner 80 ... Vertical member 90 ... Outer circumference Pillar

Claims (4)

A water jet gun that injects water at high pressure
The main body connected to the supply device that supplies water at high pressure,
The outer piping attached to the main body and
A flexible inner pipe rotatably provided inside the outer pipe and connected to the supply device,
The nozzle fixed to the tip of the inner pipe and
A water jet gun including a rotary drive device that rotates the base end side of the inner pipe. The water jet gun according to claim 1, wherein the tip surface of the nozzle is provided with an injection port forming a predetermined angle toward the front of the rotation axis. The water jet gun according to claim 1 or 2, wherein the outer pipe is a curved pipe. The water jet gun according to any one of claims 1 to 3, wherein the water jet gun is used for removing asbestos-containing material adhering to the inside of a building.

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