JPH07119203A - Pipe inside cleaning method - Google Patents

Abstract

PURPOSE:To easily grasp the cleaning condition by jetting the sewage, which is stagnated inside of a buried pipe between manholes, to agitate and mix the sludge and water, and draining the agitated water again from the manhole to the ground, and separating the agitated water into sludge and water, and returning the water into the buried pipe. CONSTITUTION:Manholes A are arranged in an existing buried pipe, and a space between two manholes A is set as one block, and each plug device 8, which is formed by installing an elastic rubber outside of a cylindrical body, is provided upstream and downstream of the manholes A. Next, compressed air is sent to clearance between the cylindrical body and the elastic rubber of the plug device 8 to expand the rubber so as to abut on the inner wall of the buried pipe 12 and cut the sewage 13. The sewage 13 is stored inside of the buried pipe 12 of the block, in which the sewage is cut. The sewage is jetted by a jetting device 1 to agitate the sludge 14 accumulated in the buried pipe 12, and the agitated water is drained to a branch device 10, which is provided on the ground, by a water suction pump 7. Furthermore, the agitated water is separated into the sludge 14 and the water by a separating device 10, and only the water is circulated through the manhole A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning an existing pipeline having a small diameter, which is already buried in the ground. More specifically, the water injected into the buried pipe and sludge are stirred and mixed, and the stirred water is refluxed. While on how to clean.

[0002]

2. Description of the Related Art Conventionally, as a method for cleaning sludge accumulated in an existing buried pipe having a small diameter, a special nozzle is attached to the end of a hose, and a high-pressure washing pump is driven to remove sludge in the buried pipe by powerful jet water. Washing and cleaning methods are used. As a cleaning method, a special nozzle that injects water backward is attached to the tip of the high pressure hose, and it is installed inside the buried pipe through a human hole, and the high pressure pump installed in the high pressure washing car on the ground is driven to generate high pressure. To generate a powerful jet of water and jet high-pressure water from a special nozzle to move it forward in the buried pipe. When the special nozzle reaches a predetermined position, the special nozzle is collected while pulling the high pressure hose. At this time, the special nozzle collects sludge accumulated in the buried pipe to the human hole while moving it backward by the jet flow. The sludge collected is sucked from a human hole by a sludge suction truck.

Further, in the above-mentioned prior art, since the water sprayed from the special nozzle is sucked into the sludge suction wheel together with the accumulated sludge and the like, a large amount of water is required and a separate water supply wheel is required. A sludge suction vehicle equipped with a device for separating and filtering water has been developed, and a recycling system in which wash water is reused as spray water is also used.

[0004]

In the sewerage system, the construction according to the above-mentioned prior art is often performed by occupying a part of the road by using a human hole in the road site. However, in order to carry out the construction by the conventional technology, there are three types of vehicles: a high-pressure washing vehicle equipped with a high-pressure washing pump that generates high-pressure water, a water truck for supplying jet water, and a sludge suction truck for sucking sludge water. Although vehicles are required, it is difficult to secure a large work base on the road site in construction in urban areas, and the above-mentioned vehicles are forcibly placed in a narrow site for cleaning work. The current situation is that the work efficiency and safety of construction are reduced.

In the above cleaning method, when the amount of accumulated sludge is large or when the sludge is relatively hard, frequent adjustments such as slowing down the speed of pulling the special nozzle in order to completely wash the sludge and the like are made. is necessary. However, in this case, since the condition of the special nozzle portion cannot be visually observed, it is performed depending on the intuition of the operator who operates it, and thus complete cleaning cannot be performed.

In order to perform a complete cleaning, it is possible to slow down the speed of pulling the special nozzle for cleaning. However, if the pulling speed is slowed down, a large amount of water is required to be sprayed, and a single water truck is required. I will not be in time. In addition, as the amount of injected water increases, the amount of sludge water also increases, which causes the problem of increasing the number of sludge water trucks, and the problem of placement in the work base.

[0007] Therefore, in order to solve the above problems, a sludge suction vehicle equipped with a device for decomposing and filtering the sucked sludge water and reusing the washing water has been developed in recent years, and the problem of an increase in water supply vehicles and the like. However, as described above, there is still a problem that the operator adjusts the speed of pulling the special nozzle depending on the amount of sludge and the condition of sludge.

In view of the above problems of the conventional method, the present invention provides a method for cleaning the inside of a pipe which does not require many devices and can easily grasp the cleaning status.

[0009]

That is, the present invention uses a means for shielding water in the buried pipe in front of each human hole installed in the existing buried pipe, and sewage or poured water stored in the existing buried pipe to inject sludge. And agitation means for agitating and mixing water, water for agitating and agitating the agitated and mixed water to the ground from a human hole, a separating means for separating the agitated water discharged into sludge and water, and a separated water Is a method for cleaning the inside of the pipe, which includes a reflux means for returning the inside of the buried pipe again.

As means for blocking the water inside the buried pipe before the human hole, elastic rubber is attached to the outer periphery of the cylindrical body,
It is possible to use a plug device that blows compressed air between the cylindrical body and the elastic rubber to expand the elastic rubber and inscribes it in the inner wall of the buried pipe to block sewage.

When water blocking is completed in the buried pipe in front of each human hole by the plug device, sewage is stored in the buried pipe in the section. As a method for storing sewage, a method is used in which a through hole equipped with a valve is provided in the plug device on the upstream side and the valve is opened to allow the sewage to flow from the upstream side. If the sewage to be stored is insufficient, it will be replenished with water from the ground.

As a means for stirring and mixing water and sludge, an injection device equipped with a high-pressure pump and provided with a plurality of nozzles for injecting water in the front-back direction is used. In stirring and mixing, water and sludge are stirred and mixed by operating a high-pressure pump and injecting high-pressure water in the front-rear direction.

As a means for discharging the agitated and mixed agitated water from a human hole to a separating means on the ground, a generally used submersible pump or the like can be used.

As a means for separating the agitated water into sludge and water, a sludge water treatment device equipped with a cyclone or a vibrating screen can be used. The water separated from the sludge is returned to the buried pipe through the other human hole. The cleaning situation inside the buried pipe is
It is judged by visually observing the stirring water discharged from the human hole to the separating means.

[0015]

With the above-described structure of the present invention, most of the water used for cleaning is sewage flowing in the buried pipe, and does not require a water truck as in the conventional case. The cleaning method is only to switch the injection water of the injection device on the ground, operation,
Easy workability. In addition, the cleaning status can be easily determined by visually observing the agitated water sent to the separation device.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the overall configuration of an embodiment of the present invention. An elastic rubber is attached to the outer circumference of a cylindrical body for blocking sewage 13 on the upstream side and the downstream side of the human hole A with two human holes A installed in the existing buried pipe 12 as one section. The plug device 8 is installed, compressed air is supplied between the cylindrical body and the elastic rubber to expand the elastic rubber, and the inner wall of the existing buried pipe 12 is inscribed to block the sewage 13. When the water blocking of the sewage 13 is completed before each human hole A, the sewage 13 is stored in the existing buried pipe 12 in that section. As a method of storing the sewage 13, the plug device 8 on the upstream side is provided with a through hole (not shown) equipped with a valve,
A method of opening the valve and allowing the sewage 13 to flow in from the upstream side is used. When the sewage 13 to be stored is insufficient, it is also possible to replenish the water from the ground.

When sewage can be stored in the existing buried pipe 12, the injection device 1 equipped with the high pressure pump 2 from one of the human holes A and provided with a plurality of nozzles 4 for injecting water in the front-rear direction is installed in the existing buried pipe. It will be installed in 12. Then, the high-pressure pump 2 is operated from above the ground to inject water in the front-rear direction to stir the sludge 14 accumulated in the existing buried pipe 12. The sewage 13 and the agitated water such as the agitated sludge 14 are drained to the above-ground separator 10 by a water absorption pump 7 which is a drainage means installed in the human hole A.

The stirring water that has entered the separator 10 is a cyclone device or a vibrating screen device (not shown) in the separator 10.
Is separated into sludge 14 and water, and the water is circulated from the other human hole by a circulation means such as a pump.

FIG. 2 is a detailed explanatory view showing an embodiment of the injection device 1. High-pressure pumps 2 connected to the front and rear nozzles 4 are provided on both sides of an ejection head 3 having a plurality of front and rear nozzles 4. The high pressure pump 2 is provided with a sled 5 so that the existing buried pipe 12 can be operated smoothly.

FIG. 3 is an explanatory view showing a method of moving the injection device 1. When the stirring and mixing of the injection device 1 part is completed and the stirring water discharged to the separation device is cleaned, the high pressure pump 2 in front of the injection device 1 is stopped, and only the high pressure pump 2 in the rear is operated to operate the nozzle 4 in the rear. To inject high-pressure water from the water to move forward. When moving backward, the reverse operation of the method described above causes the injection device 1 to move backward.

FIG. 4 is an explanatory view showing the state of stirring and mixing of the injection device 1. When the injection device 14 moves forward to near the sludge, the high pressure pump 2 in the front is also operated, high pressure water is injected back and forth, and the advance stops. The sludge 14 is agitated together with the sewage 13 by the water sprayed back and forth, and is drained by the water absorption pump 7 installed in the human hole A.

In the present embodiment, the water separated by the separator 10 is returned to the discharged human hole A and the different human hole A, but is returned to the discharged human hole A according to the working conditions. It is also possible to do it by a method.

The separating device 10 may be a stationary type as in the present embodiment, but by adopting a method in which the separating device 10 is mounted on a vehicle, workability during movement can be improved.

[0024]

According to the pipe cleaning method of the present invention, the operator can easily and accurately determine the cleaning condition inside the existing buried pipe by merely observing the agitated water drained to the separator. The sewage flowing in the buried pipe is used as the water used for cleaning the inside of the pipe, which does not require a large amount of water or a water truck as in the past, is economical, and makes it possible to reduce the work base. became.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view for explaining the overall configuration of a pipeline correction propulsion method of the present invention.

FIG. 2 is a cross-sectional view illustrating details of the injection device of the present invention.

FIG. 3 is a cross-sectional view illustrating a method of moving the injection device of the present invention.

FIG. 4 is a cross-sectional view illustrating a stirring state by the injection device of the present invention.

[Explanation of symbols]

 1 injection device 2 high pressure pump 3 injection head 4 nozzle 5 sled 6 electric wire 7 water absorption pump 8 plug device 9 drain hose 10 separation device 11 reflux hose 12 existing buried pipe 13 sewage 14 sludge A human hole

Claims (1)

[Claims] 1. A method for cleaning sludge accumulated in an existing buried pipe having a small diameter as a section between two manholes installed in the buried pipe, which is buried in front of each manhole installed in the existing buried pipe. Means for blocking the water inside the pipe, agitating means for agitating and mixing the sludge and water by using the sewage or the injected water stored in the existing buried pipe, and drainage for agitating and agitating the agitated water to the ground through a human hole. An in-pipe cleaning method comprising: a means, a separation means for separating drained agitated water into sludge and water, and a recirculation means for returning the separated water from the human hole into the buried pipe again.