JP2002119934A - Wall surface cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wall surface cleaning method by which a stubbornly adhering foreign substance can be removed by low jet pressure, when the wall surface of a duct is cleaned by spewing high pressure fluid from a nozzle. SOLUTION: The wall surface 18 to be cleaned is covered with a covering lid 20 so that two opposed sides 20a and 20b come into contact with each other and the intermediate part is separated apart to form a space 21, at least one opening 21a is formed in the space 21 and a high pressure hose 14 inserted into the space 21 from the opening 21a is rotated around the center axis of the hose 14. Further, the hose 14 is moved back and forth in the center axial direction and the high pressure fluid is spewed from a plurality of jet apertures 15a and 15b with different diameters which are perforated in an orthogonal direction with the advancing/receding direction of a nozzle 15 fitted to the tip of the rotary high pressure hose 14. Thus the nozzle 15 is spirally moved by jet pressure difference in such a state that the nozzle 15 is set in close proximity with the inner wall surface of the space 21 and the wall surface 18 is cleaned by the spewed high pressure fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning method capable of obtaining a large cleaning power by lowering the injection pressure in cleaning a pipe line by jetting a high-pressure fluid from a nozzle. The present invention relates to a method for cleaning a wall surface that can be applied to cleaning an open wall surface, such as a part of a pipe.

[0002]

2. Description of the Related Art Generally, in order to clean the inner walls of pipes such as oil feed pipes and water supply and sewage systems, high-pressure water is jetted from a jet nozzle to remove rust and sludge deposited on the pipe inner walls by the jet pressure. A method of removal is taken.

As a jet nozzle, four to six branch pipes extend radially from the tip of a central pipe connected to a hose, and an injection port is provided at the tip of each branch pipe. By injecting high-pressure water from the nozzle by inclining the branch pipe slightly backwards like an umbrella bone, the branch pipe is washed and at the same time, the force to advance the nozzle is applied and it moves lightly in the pipeline. Can be.

[0004] However, in the above-described method, manual movement of an operator is required to move the nozzle, and the feeding speed is difficult to be constant. Further, in the above method, the pipe diameter is limited to about 20 cm, and when the pipe diameter becomes larger, the jet nozzle has to be handled completely by hand.

Accordingly, the applicant of the present application has filed Japanese Patent Application
In 118812, a high-pressure hose is inserted into the pipe, and the high-pressure hose is rotated around its central axis. The first and second nozzles having different diameters opened to the left and right of the nozzle attached to the tip of the high-pressure hose. The pressure fluid is injected at a pressure of about 100 MPa, the nozzle is brought close to one of the inner walls of the pipe due to the difference in the injection pressure, and the high-pressure hose rotates around the central axis,
And a method of cleaning the inner wall of the pipe by moving the nozzle spirally on the inner wall of the pipe while maintaining the state close to one of the inner walls by moving in the central axis direction, and an apparatus for performing the method. Has been proposed.

[0006] According to this cleaning method, it is possible to clean even a large-diameter pipe having a diameter exceeding 1 meter, and the work can be completed in a short time without causing uneven cleaning.

[0007]

However, in the above-described cleaning method, the jet pressure of the fluid generally increases as the diameter of the pipe increases. However, if the pressure is set too high as in a fume pipe, the strength of the pipe increases. Some of them are short and can break. In such a case, the injection pressure of the fluid must be reduced. For example, in the case of a fume tube, it is necessary to suppress the pressure to about 20 MPa.

[0008] On the other hand, foreign matter may adhere to the fume tube firmly. For example, mortar and concrete lumps are representative. This is caused by discarding excess mortar or concrete at a construction site into sewage or the like. Conventionally, there has been no suitable method for removing such foreign matter, and there has been no other way but to completely remove the foreign matter.

The present invention has been made in view of the above-described circumstances, and has as its object to provide a method of cleaning a wall surface capable of removing even a strongly adhered foreign substance with a low injection pressure.

[0010]

In order to achieve the above object, a method for cleaning a wall according to the present invention is arranged such that two opposite sides of the wall to be cleaned are in contact with each other and a space is formed between the two sides of the wall. At least one opening is formed in the space, and the high-pressure hose inserted into the space from the opening is rotated about its central axis and moved forward and backward in the direction of the central axis. A high-pressure fluid is ejected from a plurality of ejection ports having different diameters provided in a direction perpendicular to the direction in which the attached nozzle moves forward and backward, and the nozzle is spiraled in a state of being close to the inner wall surface of the space due to a difference in ejection pressure. It is characterized in that it moves in a shape and cleans the wall surface with the injected high-pressure fluid.

Further, the cover may be formed as a part of a hollow cylinder, and the opening may be formed in both directions of moving the high pressure hose, or the cover may be cleaned while moving on the wall. it can.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view showing a state of cleaning a wall surface according to the present invention. The cleaning device 10 includes a high-pressure fluid supply source 11, a hose rotation unit 12, a hose feeding device 13, a high-pressure hose 14, and a nozzle 15 attached to a tip of the high-pressure hose. Reference numeral 18 indicates a wall surface to be cleaned, and reference numeral 20 indicates a cover. The wall surface 18 and the cover 20 will be described later.

As the high-pressure fluid supply source 11, a high-pressure washing vehicle is used. This high-pressure washing vehicle has a capability of discharging high-pressure water of about 100 MPa at about 120 to 180 l / min.

The hose rotation unit 12 receives high-pressure water from the high-pressure fluid supply source 11 by the connection hose 16 and supplies the high-pressure water to the high-pressure hose 14. At the same time, the high-pressure hose 14 is rotated around its central axis 14a by a known configuration. Is to give. The hose rotating unit 12 has wheels 12a, and can move forward and backward in the direction of the arrow as the high-pressure hose 14 moves forward and backward. In addition, it is desirable to lay rails in order to facilitate the retreat. Further, when the high-pressure hose 14 retreats, it is mainly when the high-pressure hose 14 returns after finishing the cleaning of the wall surface. In order to accelerate the retreat movement, the winch 17 is added as necessary.

FIG. 2 is a perspective view showing a main part of the hose feeding device 13. As shown in FIG. The hose feeder 13 is provided with two rubber support wheels 13a and 13b and one feed wheel 13c, and a rotating high-pressure hose 14 is inserted between them. Each wheel is supported by a frame (not shown) of the hose feeder 13.

All three wheels 13a, 13b, 13c are in contact with the high-pressure hose 14 at an appropriate pressure, and the lower two supporting wheels 13a and 13b have a rotating shaft whose central axis is the high-pressure hose 14. 14a, which supports the high-pressure hose 14 from below.
Between the two wheels and is stably held. on the other hand,
The upper feed wheel 13c comes into oblique contact with the high-pressure hose 14. In addition, this feed wheel 13c
13d is rotatable, and the feed wheel 13c is moved from a position where the contact angle α becomes an acute angle as shown in FIG.
An appropriate contact angle can be set between a position where the contact angle α shown in FIG. 3B becomes an obtuse angle.

If the feed wheel 13c has an angle α <9 shown in FIG.
When the high pressure hose 14 contacts the high pressure hose 14 at an angle of 0 °, the high pressure hose 14 moves from left to right in the figure. Feed wheel 1
When 3c contacts the high-pressure hose 14 at an angle of α> 90 ° shown in FIG. 3B, the high-pressure hose 14 moves in reverse from right to left in the figure. That is, the high pressure hose 14
By simply changing the contact angle α of the feed wheel 13c with the high-pressure hose 14 without changing the rotation direction of the high-pressure hose 14, the high-pressure hose 14 can be sent to the right or left. Also, by increasing or decreasing the contact angle α, the speed of forward / backward movement can be increased / decreased.

FIG. 4 is a perspective view of the nozzle 15. The nozzle 15 is connected to a tip of the high-pressure hose 14. There are a first injection port 15a and a second injection port 15b having different diameters on both the left and right sides in the reciprocating direction of the nozzle 15, and these first injection port 15a and the second injection port 15b are connected to the central axis of the nozzle 15. 15c is opened in a direction perpendicular to the direction. The center axis 15c of the nozzle is an extension of the center axis 14a of the high pressure hose 14. The first and second injection ports 15a and 15b are
The nozzle tips are formed at both ends of one nozzle tip.
Since the nozzle tip is straight, the first injection port 15a and the second injection port 15b are located on the opposite sides of the nozzle 15 at an interval of exactly 180 °.

FIG. 5 is a sectional view taken along line AA of FIG. The wall surface 18 to be cleaned is, in this embodiment, part of a large-diameter tube. Normally, foreign matters 19 such as concrete are accumulated on the bottom surface of the pipe, and therefore, this is most often cleaned. However, needless to say, the present invention is not limited to the bottom surface. The cover 20 has an arc shape having a cross-sectional shape with a radius of curvature smaller than the diameter of the tube, that is, a part of a hollow cylinder, and is arranged so as to cover the wall surface 18 at the bottom of the tube.
The cover lid 20 has two opposing sides 20a and 20b abutting on the wall surface 18 to form a space 21 between the cover 20 and the wall surface 18. The space 21 has a moving direction of the high-pressure hose 14 as shown in FIG. Openings 21a and 21b are formed before and after.

As shown in FIG. 1, the nozzle 15 has an opening 21.
A enters the space from a, and jets high-pressure water from the nozzle 15 in the space 21. The cover 20 is made of steel and has a sufficient weight so as not to move due to the injection pressure. Alternatively, the cover 20 may be pressed from above, or the wall 18 may be pressed.
If is made of iron, the opposite sides 20a, 20b of the cover 20
It is also possible to adopt a configuration in which a magnet is attached to and is attracted by magnetic force.

As shown in FIG. 5, high-pressure water supplied from the high-pressure hose 14 is supplied from both the first injection port 15a and the second injection port 15b provided in the opposite directions at the same time as indicated by a and b. It is injected. The diameter of the first injection port 15a and the second injection port 15b of the nozzle 15 is the second injection port 15a.
Since b is larger, the amounts of water a and b injected from the two injection ports are different, and the second injection port 15b having a larger diameter discharges a larger amount of water than the first injection port 15a. Gushing. The nozzle 15 is attached only to the tip of the high-pressure hose 14 and is not fixed.
Moves to a position shown in the figure where the reaction force of the water jetted from the two jet ports 15a and 15b is balanced, that is, a position close to one tube wall of the space 21. Then, the inner wall of the space 21 is cleaned by the injection pressure of the water a injected from the first injection port 15a near the pipe wall.

Since the high-pressure hose 14 rotates around its central axis, the nozzle 15 also rotates. Then
Since the jet direction of the high-pressure water also changes, the nozzle 15
1 will rotate on the loop 30 orbiting along the shape of the inner wall. As the hose feed device 13 advances the rotation, the nozzle 15 eventually cleans the wall surface 18 while spirally moving in the space 21 as shown in FIG. At this time, the foreign matter 19 such as the dirt on the wall surface 18 and the concrete lump is pulverized, peeled and removed by the strong force of the high-pressure water. By appropriately setting the rotation speed of the high-pressure hose 14 and the feed speed of the hose feed device 13,
The portion of the wall surface 18 covered with the cover 20 can be cleaned without causing cleaning unevenness.

If the rope 25 is connected to the cover 20 and the rope 25 is pulled in accordance with the progress of the high-pressure hose 14 and the cover 20 is moved, the wall surface 18 can be continuously cleaned. If another rope 26 is tied to the opposite side of the cover 20, it can be used when the cover 20 is collected after washing.

According to the method of the invention, the wall surface 1 to be cleaned
8 is covered with a cover 20 to form a small space 21,
Even if the injection pressure of the high-pressure water is reduced, a large washing power can be obtained, and the concrete mass firmly fixed to the fume pipe can be separated. Since the injection pressure is reduced, the fume tube is not damaged.

In the aforementioned Japanese Patent Application No. 2000-118812, the entire pipeline is cleaned without using the cover 20. However, according to the method of the prior application, it is not possible to clean well where the pipeline is branched. On the other hand, in the present invention, since the wall is cleaned by installing the cover inside one pipe, even if the pipe is branched, it can be cleaned in the same manner as a non-branched portion. .

According to the cleaning method of the present invention, even the inner wall of a partially open groove such as a U-shaped groove can be cleaned by covering the opening with a flat cover. Even if the wall surface 18 is completely flat, it can be cleaned by covering it with a semicircular cover. Although the opening is provided before and after the cover 20 in the traveling direction, the rear opening 21a is provided.
And the front opening 21b may be closed.

[0027]

As described above, in the method for cleaning a wall according to the present invention, a wall to be cleaned is covered with a cover, a high-pressure hose is inserted into a space between the wall and the cover, and the high-pressure hose is placed at its center. By rotating around the axis and moving back and forth in the direction of the central axis, high-pressure fluid is jetted from a plurality of nozzles having different diameters of nozzles attached to the tip of the rotating high-pressure hose, and the nozzle is moved into the above space by a difference in jet pressure. It moves in a spiral shape close to the inner wall surface of the tube, and cleans the wall surface with the injected high-pressure fluid. Peeling force can be obtained. If the cover is configured to be cleaned while moving on the wall surface, continuous cleaning can be performed.

[Brief description of the drawings]

FIG. 1 is an overall view showing a state of cleaning a wall surface according to the present invention.

FIG. 2 is a perspective view showing a main part of a hose feeding device 13;

FIG. 3 is a diagram illustrating a main configuration of a hose feeder.

FIG. 4 is a perspective view of a nozzle.

FIG. 5 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 14 High-pressure hose 15 Nozzle 15a, 15b Injection port 18 Wall surface 20 Cover 20a, 20b Opposite two sides 21 Space 21a Opening

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiro Yamazaki 24-9 Kawaijukucho, Asahi-ku, Yokohama-shi Toyoki Engineering Co., Ltd. In-house (72) Inventor Terue Yamazaki 24-9 Kawaijukucho, Asahi-ku, Yokohama Toyoko Engineering Co., Ltd. In-house (72) Inventor Kazuhiro Shindo 24-9 Kawaijuku-cho, Asahi-ku, Yokohama-Toyo Kiko Co., Ltd. In-house F-term (reference) 3B116 AA13 AB51 BB32 BB34 BB43 BB55 BB62 BB81

Claims (3)

[Claims] 1. A wall (18) to be cleaned is placed on two opposite walls.
The sides (20a, 20b) are in contact with each other, and the space is covered with a cover (20) so as to form a space (21) with the middle part being separated. The high-pressure hose (14) inserted into the nozzle is rotated about its central axis and moved forward and backward in the direction of the central axis. A high-pressure fluid is ejected from a plurality of ejection ports (15a, 15b) having different diameters, and the nozzle is spirally moved in a state of being close to the inner wall surface of the space due to a difference in the ejection pressure. A method for cleaning a wall, comprising cleaning a wall (18). 2. The method for cleaning a wall surface according to claim 1, wherein the cover is formed as a part of a hollow cylinder, and the opening is formed in both the moving direction of the high-pressure hose. 3. The method for cleaning a wall surface according to claim 1, wherein the cleaning is performed while moving the cover on the wall surface.