JP4301715B2 - Cleaning method for existing piping - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning method for existing pipes, and more particularly, to a cleaning method for polishing an inner surface of a pipeline by conveying an abrasive in an air flow.
[0002]
[Prior art]
Pipe lines used for gas pipes and water and sewage systems may be used by connecting pipe lines with different diameters to a part of the facility section.
For example, in the case of sewers, sewers in apartment houses and detached houses in each region are connected to a common drainage channel and communicated to a common drainage basin provided at one end of the common drainage channel. It is supposed to be.
For example, in the case of an apartment house, the drainage pipe from each house is connected to a drainage standpipe, and the drainage standpipe is connected to a common drainage pipe forming a common drainage channel. In the case of a detached house, drainage pipes from each house are connected to a common drainage pipe.
FIG. 7 is a schematic diagram showing the piping state of the common drainage pipe A and the drainage construction pipe and drainage pipe (hereinafter referred to as drainage branch pipe) B connected to the common drainage pipe A and in this figure. Compared with the drainage branch pipe B, those having a larger diameter are used and are laid toward the common drainage basin C, and steel pipes are frequently used in consideration of durability.
When a metal pipe such as a steel pipe is used as a pipe line material, an aging phenomenon due to corrosion or the like progresses when the embedding period becomes long, and a defective portion such as a leak hole may be generated in the pipe. The drainage branch and the joint drainage pipe are regularly cleaned because red rust, scales and the like adhere to the inner surface when the laying period is long, and the flow of drainage tends to be hindered.
There is a cleaning method proposed by the present applicant in Japanese Patent Laid-Open No. 11-310953.
In the above publication, a suction or pressure air flow is generated from one end of a drainage branch pipe, in other words, a pipe having a small diameter of about 50A, and the abrasive is conveyed into the pipe by the airflow. It is like that.
[0003]
[Problems to be solved by the invention]
However, in the case of a joint drainage pipe in which a pipe having a large diameter of about 100A is used, unlike the small diameter of 50A, the above-mentioned method disclosed in the publication has a large facility for performing the cleaning process. There was a problem of becoming.
It is known that the common drainage pipe has a large diameter unlike the drainage branch pipe, and the air flow rate in the pipe line is proportional to the square of the diameter. For this reason, when a common drainage pipe having a larger diameter than that of the drainage branch pipe is targeted, facilities for obtaining a necessary air flow rate become large.
[0004]
In view of the problems in the conventional cleaning method described above, an object of the present invention is to provide an existing cleaning capable of cleaning a pipe having a diameter larger than that of a drainage branch using a facility capable of obtaining an air flow rate for the drainage branch. It is to provide a method for cleaning a pipeline.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is a method for cleaning an existing pipeline in which the deposits on the inner surface of the pipeline are removed by an abrasive that is conveyed by airflow on the inner surface of the existing pipeline. A suction device is connected to one end in the direction, and a storage portion for the abrasive that communicates with the existing pipeline is disposed at the other end in the laying direction of the existing pipeline, and the abrasive is placed in the existing pipeline from the storage portion. The other end side of the existing pipe line in the laying direction and the supply hose can adjust the amount of suction air generated by the suction device. It is characterized by that.
[0006]
According to a second aspect of the present invention, in the cleaning method for an existing pipe line according to the first aspect, the supply hose is moved in the existing pipe line in the laying direction of the existing pipe line to thereby remove the abrasive. It is characterized in that it can be ejected toward the inner surface of the pipeline along the laying direction of the existing pipeline.
[0007]
According to a third aspect of the present invention, in the cleaning method for an existing pipe line according to the first aspect, the amount of suction air on the existing pipe line side and the supply hose side is adjusted by changing the opening areas of the existing pipe line and the supply hose. It is characterized by doing.
[0008]
According to a fourth aspect of the present invention, in the cleaning method for an existing pipe line according to the first or third aspect, the suction air amount on the existing pipe line side is adjusted at the opening end on the other end side in the laying direction of the existing pipe line. The suction member is provided on a support member that supports the supply hose and can be opened and closed, and the amount of suction air on the supply hose side is adjusted to the rear of the housing portion in the moving direction of the abrasive in the supply hose. It is characterized by being performed by the adjustment valve located in (3).
[0009]
Invention of Claim 5 is the cleaning method of the existing pipe line as described in one of Claims 1, 3, and 4,
The supply hose is provided with an opening end positioned in the existing pipe line so as to be rotatable in the circumferential direction using a reaction force generated when the abrasive is discharged, and discharges the abrasive over the entire circumferential direction. It is characterized by that.
[0010]
The invention according to claim 6 is the cleaning method for an existing pipeline according to claim 5, wherein the opening end in the existing pipeline in the supply hose is eccentric from the center of the cross-section of the existing pipeline, and the diameter of the existing pipeline It is characterized by being directed toward the inner surface of the existing pipe line in a state parallel to the direction.
[0011]
[Action]
In the first and third aspects of the invention, since the amount of suction air in the existing pipe line and the supply hose can be adjusted, the polishing that has moved in the supply hose even when the existing pipe line when the diameter is greatly changed is targeted. It is possible to secure a sufficient amount of suction air necessary for air-conveying the material in the existing pipe line, and to maintain the scraping work of red rust and scale by moving the abrasive.
[0012]
In the invention according to claim 2, since the abrasive can be injected onto the inner surface of the pipe along the laying direction of the existing pipe by moving the supply hose in the laying direction of the existing pipe, the action according to the invention of claim 1 In combination with this, it is possible to efficiently inject the abrasive over the entire laying direction of the existing pipeline with the amount of air necessary for cleaning.
[0013]
In the invention according to claim 4, since the member for adjusting the opening area of the existing pipeline is provided in the support portion of the supply hose, the suction required for conveying the abrasive material in the existing pipeline simultaneously with the insertion of the supply hose The amount of air and the airflow speed can be set, and the adjustment work for airflow conveyance can be simplified.
[0014]
In the invention according to claim 5, since the open end of the supply hose can be rotated by utilizing the reaction force generated when the abrasive is discharged, it can cover the entire circumferential direction of the existing pipe line without using a special mechanism. Thus, the impact force of the abrasive can be applied.
[0015]
In the invention according to claim 6, since the opening end of the supply hose can be rotated using the reaction force with a simple configuration that is eccentric from the center of the cross section of the existing pipeline, the inner peripheral surface of the existing pipeline Abrasive material can be discharged evenly over the entire area.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the illustrated examples.
FIG. 1 is a schematic diagram for explaining a principle configuration applied to the cleaning method according to the present embodiment. In FIG. 1, reference numeral 1 denotes the common drain pipe shown in FIG. In the present invention, not only the drain pipe but also the water supply and the gas supply pipe can be used.
Although not shown, the common drain pipe 1 is a pipe line that communicates with a drain branch pipe piped in an apartment house. The drain pipe has a diameter of about 50A, whereas the steel pipe has a large diameter of about 100A. It consists of The common drain pipe 1 in this case is a pipe line called a horizontal main pipe which is buried in the ground and has one end in the laying direction in the drainage tub 2.
A suction machine 3 using a suction pump is arranged at one end in the laying direction of the common drain pipe 1, and a supply hose 5 partially communicating with the accommodating portion 4 containing the abrasive is inserted at the other end in the laying direction. ing.
[0017]
FIG. 2 is a schematic view showing the configuration of the abrasive accommodating portion 4. In the drawing, the accommodating portion 4 of the abrasive S is composed of a cylindrical member having a funnel-like cross-sectional shape and communicates with the supply hose 5. The opening and the side opposite to the communication portion are opened and closed by the lid member 6. Although not shown, the lid member 6 has an opening communicating with the atmosphere so that the abrasive S contained therein flows out when a negative pressure is applied by the suction device 3. An abrasive regulating valve 7 that adjusts the supply amount of the abrasive S is provided at the communicating portion between the housing 4 and the supply hose 5.
The supply hose 5 is divided into a part connected to the accommodating part 4 and a part inserted into the common drain pipe 1, and the side located in the common drain pipe 1 is made of a flexible material. ing.
A supply hose adjustment valve 8 capable of adjusting the amount of suction air in the supply hose 5 is provided in the vicinity of the housing 4 in the supply hose 5.
[0018]
The supply hose 5 is supported at the opening on the other end side of the common drain pipe 1 in the laying direction.
FIG. 3 is a view showing a support structure of the supply hose 5 at the opening of the common drain pipe 1. In FIG. 3, the support portion of the supply hose 5 is as shown in FIG. As shown in FIG. 3 (B), the support member 9 is provided with an insertion guide portion 9A for the supply hose 5 at the center of the cross section and a plurality of support leg portions 9B protruding from the center at the position in the circumferential direction. The shutter member 10 is divided into two at the center of 9 and can move in the direction of approaching and separating from each other.
The opening of the common drainage pipe 1 where the shutter member 10 is located is a portion where the outside air flows into the inside, and the opening area of the common drainage pipe 1 can be opened and closed by changing the opening and closing by opening and closing each other. The amount of inflow air corresponding to the area, in other words, the amount of suction air generated by the suction device 3 can be adjusted.
[0019]
The opening of the end located in the common drain pipe 1 in the supply hose 5 is a discharge part capable of injecting the abrasive, and its configuration is shown in FIG.
In FIG. 4, the supply hose 5 is inserted and supported by a discharge portion support member 11 slidable in the common drain pipe 1 at the end of the flexible portion inserted into the common drain pipe 1. A nozzle portion 5 </ b> A that forms a discharge portion is connected to the end portion via an annular joint member 12.
As shown in FIG. 4, the discharge portion support member 11 includes an insertion guide portion 11A for the supply hose 5 at the center of the cross section of the common drain pipe 1, and a sliding leg 11A protruding radially from the insertion guide portion 11A. The supply hose 5 is positioned at the center of the cross-section of the common drain pipe 1 provided at equal positions in the direction.
[0020]
As shown in FIG. 5, the discharge part support member 11 can slide in the common drain pipe 1, and the space between the sliding legs 11 </ b> A is used as a ventilation part P. Therefore, the common drain pipe 1 It can slide without interfering with the airflow inside.
The annular joint member 12 is a member that is fitted to the end portion of the supply hose 5 and is rotatable in the circumferential direction, and the nozzle portion 5A is integrated therewith. As shown in FIG. 4, the nozzle portion 5 </ b> A is oriented toward the upper circumferential direction of the common drain pipe 1, and as shown in FIG. 6, the nozzle section 5 </ b> A is eccentric from the center of the cross section of the common drain pipe 1. Are directed toward the inner surface in the circumferential direction of the common drain pipe 1.
The nozzle portion 5A is eccentric from the center of the cross section of the common drain pipe 1, and the moment of the common drain pipe 1 due to the moment generated by the reaction force received from the air in the common drain pipe 1 when the abrasive is ejected according to the directing direction. It can rotate in the circumferential direction.
[0021]
In the present embodiment, the following procedure is executed using the above configuration.
(1) While the suction machine 3 is connected to one end of the common drain pipe 1 exposed in the drainage basin 2, a part of the common drain pipe 1 is communicated with the accommodating portion 4 at the other end side of the common drain pipe 1. Supply hose 5 is inserted.
The supply hose 5 is inserted into the insertion guide portion 9A of the support member 9 disposed in the opening of the common drain pipe 1, and the vicinity of the opening end is inserted into the discharge portion support member 11 disposed in the common drain pipe 1. The nozzle portion 5 </ b> A is connected via the annular joint member 12.
[0022]
(2) When the suction operation is started by the suction machine 3, the inside of the common drain pipe 1 is made negative pressure. When the abrasive regulating valve 7 on the housing 4 side is opened in conjunction with the suction operation of the suction machine 3, the atmosphere flows into the housing 4 through the opening formed in the lid member 6, and polishing is performed. The material S flows out into the supply hose 5. The outflow amount of the abrasive S is adjusted by the opening degree of the abrasive regulating valve 7.
[0023]
(3) When the abrasive S flows out, the joint drain pipe 1 is adjusted by adjusting the opening of the shutter member 10 provided at the opening of the joint drain pipe 1 and the regulating valve 8 provided on the supply hose 5 side. In addition, the opening area of the supply hose 5 can be changed, whereby the amount of suction air flowing into the common drain pipe 1 can be adjusted to correspond to that in the supply hose 5. That is, the suction force from the suction machine 3 acting on the supply hose 5 is increased because it is smaller in diameter than the common drain pipe 1, and is discharged from the nozzle portion 5A that is a discharge portion, but is discharged. The abrasive is conveyed in the common drain pipe 1 depending on the amount of air sucked in the common drain pipe 1. For this reason, when the amount of suction air obtained by the opening area of the common drain pipe 1 decreases at a position where the supply hose 5 does not exist, the abrasive S becomes difficult to move to the side where the suction machine 3 is located. The polishing operation in the tube 1 is likely to be delayed.
In the present embodiment, the suction air amount flowing into the joint drain pipe 1 can be maintained at a desired amount by adjusting the opening degree of the shutter member 10 provided in the support member 9, so that the abrasive material S is conveyed. The amount of suction air necessary for the above can be secured, and the polishing operation is continued in the section from the nozzle portion 5 </ b> A to the suction device 3 in the common drain pipe 1. In particular, since the high-speed air flow can be generated inside the common drain pipe 1 by adjusting the opening area, the conveying speed of the abrasive S in the supply hose 5 can also be increased, and thereby the inner circumference of the common drain pipe 1 can be increased. The abrasive can be ejected in a state where the impact force on the surface is increased. As a result, the effect of scraping red rust and scale adhering to the inner peripheral surface of the common drain pipe 1 is enhanced.
[0024]
(4) The impact force of the abrasive is uniformly applied to the inner peripheral surface of the common drain pipe 1 over the entire circumference as the nozzle portion 5A of the supply hose 5 rotates in the circumferential direction.
When the ejection pressure when discharged acts on the air in the common drainage pipe 1 due to the configuration of the nozzle portion 5A which is eccentric from the center of the cross section of the common drainage pipe 1 and is parallel to the radial direction A moment is generated by the reaction force generated in the nozzle 5A, and the nozzle portion 5A is rotated by this moment. As a result, the abrasive S is ejected over the entire inner peripheral surface of the common drain pipe 1. In addition, the jet pressure can be increased by adjusting the opening degree of the supply hose adjustment valve 8 provided in the supply hose 5, and the amount of the abrasive material S is also jetted by the adjustment valve 7. Since it can be adjusted, it is possible to easily set the impact force and the amount of abrasive necessary for scraping off the red rust and scale adhering to the inner peripheral surface of the common drain pipe 1.
[0025]
【The invention's effect】
According to the first and third aspects of the invention, since the amount of suction air in the existing pipe line and the supply hose can be adjusted, even if the existing pipe line when the caliber is largely changed is moved, the movement in the supply hose is performed. The amount of suction air necessary for air-conveying the polished abrasive in the existing pipe line can be secured, and the red rust and scale scraping work by the movement of the abrasive can be favorably maintained. As a result, even when the diameter changes greatly, the existing pipe line can be cleaned without preparing a suction mechanism corresponding to the diameter.
[0026]
According to the second aspect of the present invention, the abrasive can be injected onto the inner surface of the pipe line along the laying direction of the existing pipe line by moving the supply hose in the laying direction of the existing pipe line. Combined with the effect of the above, the abrasive can be efficiently injected over the entire laying direction of the existing pipeline with the air amount necessary for cleaning. As a result, the abrasive does not spread throughout the entire laying direction of the conduit, and cleaning can be performed efficiently.
[0027]
According to the invention described in claim 4, since the member for adjusting the opening area of the existing pipe line is provided in the support portion of the supply hose, it is necessary for conveying the abrasive in the existing pipe line simultaneously with the insertion of the supply hose. Therefore, it is possible to set an appropriate suction air amount and air flow velocity, and to simplify adjustment work for air flow conveyance. This simplifies the equipment used for cleaning and reduces the number of work steps.
[0028]
According to the fifth aspect of the present invention, since the opening end of the supply hose can be rotated by utilizing the reaction force generated when the abrasive is discharged, the entire circumferential direction of the existing pipe line can be used without using a special mechanism. The impact force of the abrasive can be applied over the entire length. As a result, it is possible to perform the cleaning on the existing pipe line whose diameter has greatly changed without making the facility complicated and large.
[0029]
According to the sixth aspect of the present invention, since the opening end of the supply hose can be rotated using a reaction force with a simple configuration that is eccentric from the center of the cross section of the existing pipe line, A uniform abrasive can be discharged over the entire circumference. As a result, even when the existing pipe line subject to a large change in diameter is used, the entire inner peripheral surface can be uniformly polished, so that the cleaning efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for explaining a configuration applied to a cleaning method according to an example for explaining an embodiment of the present invention.
2 is a schematic diagram for explaining a configuration of an abrasive supply unit in the configuration shown in FIG. 1; FIG.
3 is a diagram for explaining a support structure at an opening of an existing pipeline in the configuration shown in FIG. 1, (A) is a side view, and (B) is a symbol (B) in (A). It is an arrow view of the direction shown by.
4 is a schematic diagram for explaining a configuration of an abrasive discharge unit in the configuration shown in FIG. 1; FIG.
FIG. 5 is a view taken in the direction indicated by the reference numeral (5) in FIG.
6 is an arrow view in the direction indicated by reference numeral (6) in FIG. 4;
FIG. 7 is a schematic view showing an example of a laying state in which pipe lines having different diameters are used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Common drainage pipe equivalent to an existing pipeline 2 Drainage tank 3 Suction machine 4 Abrasive material storage part 5 Supply hose 5A Nozzle part which makes discharge part 7 Abrasive material adjustment valve 8 Supply hose adjustment valve 9 Support member 9A Insertion guide Part 10 shutter member 11 discharge part support member 12 rotatable annular joint member

Claims (6)

In the cleaning method of the existing pipeline that removes the deposits on the inner surface of the pipeline with the abrasive that is air-flowed on the inner surface of the existing pipeline,
A suction device is connected to one end of the existing pipeline in the laying direction,
The other end in the laying direction of the existing pipe line is provided with a storage portion for the abrasive that communicates with the existing pipe line,
The abrasive is sucked and conveyed into the existing pipe line through a supply hose inserted into the existing pipe line from the housing portion,
A cleaning method for an existing pipe line, wherein the other end side in the laying direction of the existing pipe line and the supply hose can adjust the amount of suction air generated by the suction device. In the cleaning method of the existing pipeline according to claim 1,
The supply hose is capable of jetting the abrasive toward the inner surface of the pipeline along the laying direction of the existing pipeline by being moved in the laying direction of the existing pipeline within the existing pipeline. Characteristic cleaning method for existing pipelines. In the cleaning method of the existing pipeline according to claim 1,
A method for cleaning an existing pipe line, wherein the suction air amount on the existing pipe line side and the supply hose side is adjusted by changing an opening area of the existing pipe line and the supply hose. In the cleaning method of the existing pipeline according to claim 1 or 3,
The adjustment of the suction air amount on the existing pipeline side is performed by a shutter member that is provided at a support member that supports the supply hose provided at the opening end on the other end side in the laying direction of the existing pipeline, The method for cleaning an existing pipe line is characterized in that the adjustment of the amount of suction air on the supply hose side is performed by an adjustment valve located behind the housing portion in the moving direction of the abrasive in the supply hose. In the cleaning method for an existing pipeline according to one of claims 1, 3 and 4,
The supply hose is provided with an opening end positioned in the existing pipe line so as to be rotatable in the circumferential direction using a reaction force generated when the abrasive is discharged, and discharges the abrasive over the entire circumferential direction. A cleaning method for existing pipelines. In the cleaning method of the existing pipeline according to claim 5,
The opening end in the existing pipeline in the supply hose is oriented toward the inner surface of the existing pipeline in a state of being eccentric from the cross-sectional center of the existing pipeline and parallel to the diameter direction of the existing pipeline. Characteristic cleaning method for existing pipelines.

Images