JP2002070145A - Cleaning method for existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method for an existing pipeline capable of cleaning the pipeline having the diameter larger than that of a drain branch pipe by utilizing a facility giving the blast quantity required for the drain branch pipe. SOLUTION: In this cleaning method for the existing pipeline 1 removing the stacked objects on the inner face of the pipeline 1 with the abrasives air- conveyed in the existing pipeline 1, a sucking device 3 is connected to one end in the installation direction of the existing pipeline 1, and a storage section 4 of the abrasives S communicated with the existing pipeline 1 is arranged at the other end in the installation direction of the existing pipeline 1. The abrasives S are sucked and conveyed in the existing pipeline 1 from the storage section 4 via a feed hose 5 inserted into the existing pipeline 1, and the suction air quantity in the existing pipeline 1 and the suction air quantity in the feed hose are adjusted on the other end side in the installation direction of the existing pipeline 1 and in the feed hose 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning method for an existing pipe, and more particularly to a cleaning method for polishing an inner surface of a pipe by carrying an abrasive in an air stream.

[0002]

2. Description of the Related Art In some cases, pipes used for gas pipes and water supply and sewage are connected to pipes having different diameters in a part of a facility section. For example, in the case of a sewer, the sewer in an apartment house or a detached house that exists in each region is connected to a common drain, and communicates with a common drain basin provided at one end of the common drain in the installation direction. It is supposed to. In a pipe used as a sewer, for example, in the case of an apartment house, a drain pipe from each house is connected to a drain stack, and the drain stack is connected to a common drain pipe forming a common drain. In the case of detached houses, the drain pipes from each house are connected to the common drain pipe. FIG. 7 is a schematic diagram showing a piping state of a common drainage pipe A and a drainage building pipe and a drainage pipe B (hereinafter, referred to as a drainage branch pipe) connected to the common drainage pipe A. In FIG. In addition, a pipe having a diameter larger than that of the drainage branch pipe B is used and laid toward the common drainage basin C. Steel pipes are frequently used in consideration of durability. When a metal pipe such as a steel pipe is used as a pipe material, an aging phenomenon due to corrosion or the like progresses when the burial period is long, and a defective portion such as a leak hole may be generated in the pipe. The drainage branch pipes and common drainage pipes are periodically cleaned because if the laying period is long, red rust or scale adheres to the inner surface and the flow of drainage is likely to be obstructed. As a cleaning method, there is a method proposed by the present applicant in Japanese Patent Application Laid-Open No. H11-310953. In the above publication, a suction or pressure air flow is generated from one end of a drainage branch pipe, in other words, a pipeline having a small diameter of about 50 A, and the abrasive is conveyed into the pipeline by the airflow. It has become.

[0003]

However, in the case of a common drainage pipe in which a large-diameter pipe of about 100 A is used, unlike a small-diameter pipe of 50 A, the cleaning process described in the above-mentioned publication is difficult. There is a problem that the equipment for executing is large. It is known that the common drainage pipe has a large diameter unlike the drainage branch pipe, and the amount of air blown in the pipe is proportional to the square of the diameter. For this reason,
If the target is a common drainage pipe with a larger diameter than the drainage pipe, the equipment required to obtain the required airflow will be large.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional cleaning method, it is an object of the present invention to provide a cleaning method for a pipe having a larger diameter than a drainage branch pipe by using a facility capable of obtaining an air flow rate for the drainage branch pipe. An object of the present invention is to provide a possible existing pipe cleaning method.

[0005]

In order to achieve this object, the invention according to claim 1 is to clean an existing pipeline by removing an adhering substance on the interior surface of the pipeline by an abrasive material which is conveyed by airflow on the interior surface of the existing pipeline. In the construction method, a suction device is connected to one end of the existing pipeline in the laying direction, and an accommodating portion of the abrasive communicating with the existing pipeline is arranged at the other end of the existing pipeline in the laying direction,
The abrasive is sucked and conveyed into the existing pipeline from the storage unit via a supply hose inserted into the existing pipeline,
The other end of the existing pipeline in the laying direction and the supply hose can adjust the amount of suction air generated by the suction device.

According to a second aspect of the present invention, in the method for cleaning an existing pipeline according to the first aspect, the supply hose is moved in the existing pipeline in a direction in which the existing pipeline is laid. It is characterized in that the material can be jetted toward the inner surface of the pipeline along the laying direction of the existing pipeline.

According to a third aspect of the present invention, in the method for cleaning an existing pipeline according to the first aspect, the amount of suction air on the existing pipeline side and the supply hose side changes the opening area of the existing pipeline and the supply hose. It is characterized by being adjusted.

[0008] The invention described in claim 4 is claim 1 or 3.
In the method for cleaning an existing pipeline described above, the adjustment of the amount of suction air on the existing pipeline side is provided on a support member that is provided at an opening end on the other end side in the laying direction of the existing pipeline and that supports a supply hose. It is performed by an openable and closable shutter member, and the adjustment of the amount of suction air on the supply hose side is performed by an adjustment valve located behind the housing in the moving direction of the abrasive in the supply hose. .

According to a fifth aspect of the present invention, in the method of cleaning an existing pipeline according to any one of the first, third and fourth aspects, the supply hose has an open end located in the existing pipeline. It is characterized in that it is provided so as to be rotatable in the circumferential direction by using a reaction force generated when the abrasive is discharged, and discharges the abrasive over the entire circumferential direction.

According to a sixth aspect of the present invention, in the method for cleaning an existing pipeline according to the fifth aspect, the open end of the supply hose in the existing pipeline is decentered from the center of the cross section of the existing pipeline. It is characterized in that it is directed toward the inner surface of the existing pipeline in a state parallel to the diameter direction of the channel.

[0011]

According to the first and third aspects of the present invention, since the amount of suction air in the existing pipeline and the supply hose can be adjusted, even if the existing pipeline is subject to a large change in diameter, the inside of the supply hose can be adjusted. The amount of suction air required to carry the moved abrasive in the existing pipeline in the air stream can be secured, and the work of scraping red rust and scale by the movement of the abrasive can be favorably maintained.

According to the second aspect of the present invention, by moving the supply hose in the direction in which the existing pipeline is laid, the abrasive can be sprayed onto the inner surface of the pipeline along the direction in which the existing pipeline is laid. With the effect of the invention, the abrasive can be efficiently sprayed over the entire area of the existing pipeline in the laying direction with the amount of air necessary for cleaning.

According to the fourth aspect of the present invention, since the member for adjusting the opening area of the existing pipeline is provided on the support portion of the supply hose, it is possible to feed the abrasive through the existing pipeline simultaneously with the insertion of the supply hose. Necessary suction air amount and airflow speed can be set, and adjustment work for airflow conveyance can be simplified.

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 circumferential direction of the existing pipeline can be achieved without using a special mechanism. The impact force of the abrasive can be applied over the entire area.

According to the sixth aspect of the present invention, the rotation using the reaction force can be performed by a simple configuration in which the open end of the supply hose is decentered from the center of the cross section of the existing pipeline. A uniform discharge of the abrasive can be performed over the entire inner peripheral surface.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram for explaining the principle configuration applied to the cleaning method according to the present embodiment. In FIG. 1, reference numeral 1 denotes the common drainage pipe shown in FIG. In the present invention, not only a drain pipe but also a water supply pipe and a gas supply pipe can be used. Although not shown, the common drainage pipe 1 is a pipeline through which drainage pipes connected to an apartment house and the like communicate. The drainage pipe has a diameter of about 50A, whereas the drainage pipe has a diameter of about 50A.
It is composed of a steel pipe having a large diameter. The common drainage pipe 1 in this case is a pipe called a horizontal main pipe which is buried in the ground and one end of the drainage basin 2 is located in the installation direction. At one end of the common drainage pipe 1 in the laying direction, a suction device 3 using a suction pump is arranged, and at the other end of the laying direction, a supply hose 5 partially inserted into a housing part 4 containing an abrasive is inserted. ing.

FIG. 2 is a schematic view showing the structure of the abrasive material storage portion 4. In FIG. 2, the abrasive material storage portion 4 is formed of a cylindrical member having a funnel-shaped cross-section, and a supply hose. 5 and a side facing the communicating portion is opened and closed by a lid member 6. The cover member 6 has an opening (not shown) that communicates with the atmosphere, so that the abrasive S contained therein flows out when a negative pressure is applied by the suction device 3. A communicating part between the housing part 4 and the supply hose 5 has an abrasive regulating valve 7 for regulating the supply amount of the abrasive S.
Is provided. The supply hose 5 is divided into a part connected to the storage 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 that can adjust the amount of suction air in the supply hose 5 is provided near the accommodation section 4 in the supply hose 5.

The supply hose 5 is supported at the opening at the other end of the common drainage pipe 1 in the laying direction. FIG. 3 is a diagram 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. At the center of the cross section, there is provided an insertion guide portion 9A for the supply hose 5, and a plurality of support legs 9 projecting from the center at the corresponding positions in the circumferential direction.
3B, and a shutter member 10 that is bisected at the center of the support member 9 and that can move in the direction of coming and coming from each other, as shown in FIG. 3B. 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 and closing of the opening of the common drainage pipe 1 can be changed by coming and going with each other. The amount of inflow air according to the area, in other words, the amount of suction air generated by the suction device 3 can be adjusted.

An opening at an end of the supply hose 5 located inside the common drainage pipe 1 is a discharge portion capable of spraying an abrasive, and its configuration is shown in FIG. In FIG. 4, the supply hose 5 has an end of a flexible portion inserted into the common drainage pipe 1 and is supported by a discharge part supporting member 11 slidable in the common drainage pipe 1. A nozzle portion 5A serving as 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 drainage pipe 1, and a sliding leg 11A that protrudes radially from the insertion guide portion 11A. The supply hose 5 is provided at an equal position in the direction, and positions the supply hose 5 at the center of the cross section of the common drainage pipe 1.

As shown in FIG. 5, the discharge portion support member 11
Can slide in the common drainage pipe 1 and the space between the sliding legs 11A is a ventilation part P,
It can slide without obstructing the airflow in the common drainage pipe 1. The annular joint member 12 is a member that is fitted to the end of the supply hose 5 and is rotatable in the circumferential direction, and has an integrated nozzle portion 5A. The nozzle portion 5A is directed toward the upper part in the circumferential direction of the common drainage pipe 1 as shown in FIG. 4, and is eccentric from the center of the cross section of the common drainage pipe 1 as shown in FIG. Common drainage pipe 1 parallel to
Are directed toward the inner surface in the circumferential direction. Nozzle part 5A
Is eccentric from the center of the cross-section of the common drainage pipe 1, and is directed in the circumferential direction of the common drainage pipe 1 by a moment generated by a reaction force received from the air in the common drainage pipe 1 when the abrasive is ejected in the direction of orientation. It can be rotated.

In the present embodiment, the following procedure is executed using the above configuration. (1) The suction device 3 is connected to one end of the common drainage pipe 1 exposed in the drainage basin 2 in the laying direction, while a part of the common drainage pipe 1 communicates with the housing 4 at the other end of the common drainage pipe 1 in the laying direction. Supply hose 5 is inserted. The supply hose 5 is inserted through the insertion guide 9A of the support member 9 arranged at the opening of the common drainage pipe 1, and the vicinity of the opening end is inserted through the discharge part support member 11 arranged inside the common drainage pipe 1. The nozzle portion 5A is connected via the annular joint member 12.

(2) When the suction operation is started by the suction machine 3, the inside of the common drainage pipe 1 is made negative pressure. Abrasive control valve 7 provided on housing 4 side in conjunction with suction operation of suction machine 3
Is opened, the atmosphere flows into the housing portion 4 through the opening formed in the lid member 6, and the abrasive S is supplied to the supply hose 5.
Spill out into. The outflow amount of the abrasive S is adjusted by the opening of the abrasive adjustment valve 7.

(3) At the time when the abrasive S flows out, the opening of the shutter member 10 provided at the opening of the common drainage pipe 1 and the adjusting valve 8 provided at the supply hose 5 side are adjusted to adjust the opening degree. The opening area of the drainage pipe 1 and the supply hose 5 can be changed, so that the common drainage pipe 1
The amount of suction air flowing into the supply hose 5 can be adjusted to correspond to that in the supply hose 5. That is, the suction force from the suction device 3 acting on the supply hose 5 is increased due to the smaller diameter compared to the common drainage pipe 1, and is discharged from the nozzle portion 5A which is the discharge portion. The abrasive is transported in the common drain 1 depending on the amount of suction air in the common drain 1. For this reason, when the amount of suction air obtained by the opening area of the common drainage pipe 1 decreases at a position where the supply hose 5 is no longer present, the abrasive S becomes difficult to move to the side where the suction device 3 is located, and the common drainage The polishing operation in the pipe 1 is likely to be delayed. In this embodiment, the common drainage pipe 1 is controlled by adjusting the opening of the shutter member 10 provided on the support member 9.
Can maintain a desired amount of suction air flowing into the inside of the nozzle, so that the suction air amount required for transporting the abrasive S can be secured, and the suction device is provided from the nozzle 5A in the common drainage pipe 1. The polishing operation will be continued in the section leading to 3. In particular, a high-speed airflow can be generated inside the common drainage pipe 1 by adjusting the opening area.
The conveying speed of the abrasive S in the inside can also be increased, so that the abrasive can be ejected in a state where the impact force on the inner peripheral surface of the common drainage pipe 1 is increased. As a result, the effect of scraping red rust and scale adhering to the inner peripheral surface of the common drainage pipe 1 is enhanced.

(4) The inner peripheral surface of the common drainage pipe 1 is provided with a uniform impact force of the abrasive over the entire circumference by rotating the nozzle portion 5A of the supply hose 5 in the circumferential direction. Due to the configuration of the nozzle portion 5A which is eccentric from the cross-sectional center of the common drain pipe 1 and is oriented so as to be parallel to the radial direction, when the ejection pressure at the time of discharge acts on the air in the common drain pipe 1 A moment is generated by the reaction force generated in the nozzle portion 5A, and the nozzle portion 5A is rotated by the moment. As a result, the abrasive S is ejected to the entire inner peripheral surface of the common drainage pipe 1. Moreover, the ejection pressure can be increased by adjusting the opening of the supply hose adjusting valve 8 provided in the supply hose 5, and the amount of the abrasive S ejected can also be increased by the adjustment valve 7. Since the adjustment can be made, it is possible to easily set the impact force and the amount of the abrasive required for scraping off the red rust and scale adhering to the inner peripheral surface of the common drainage pipe 1.

[0025]

According to the first and third aspects of the present invention,
Since the amount of suction air in the existing pipeline and the supply hose can be adjusted, even when targeting the existing pipeline when the diameter changes greatly, the abrasive material that has moved in the supply hose is transported in the existing pipeline by airflow. In this way, it is possible to secure the amount of suction air necessary for the cleaning, and to maintain the work of scraping red rust and scale due to the movement of the abrasive. As a result, even when the diameter greatly changes, the existing pipeline can be cleaned without preparing a suction mechanism corresponding to the diameter.

According to the second aspect of the invention, by moving the supply hose in the direction in which the existing pipeline is laid, the abrasive can be sprayed onto the inner surface of the pipeline along the installation direction of the existing pipeline. In combination with the effect of the invention described above, the abrasive can be efficiently sprayed over the entire area in the laying direction of the existing pipeline with the amount of air necessary for cleaning. This eliminates the situation where the abrasive does not spread throughout the entire area in the pipe laying direction, and enables efficient cleaning.

According to the fourth aspect of the present invention, since the member for adjusting the opening area of the existing pipeline is provided in the support portion of the supply hose, the abrasive material in the existing pipeline is simultaneously inserted with the supply hose. It is possible to set the suction air amount and the airflow velocity necessary for the conveyance, and it is possible to simplify the adjustment work for the airflow conveyance. As a result, it is possible to simplify the equipment used for cleaning and reduce the number of work steps.

According to the fifth aspect of the present invention, since the open end of the supply hose can be rotated by utilizing the reaction force generated when the abrasive is discharged, the existing hose can be rotated without using a special mechanism. The impact force of the abrasive can be applied over the entire circumferential direction. As a result, cleaning can be performed on an existing pipeline whose diameter has greatly changed without making the equipment complicated and large-scale.

According to the sixth aspect of the present invention, the rotation using the reaction force can be performed by a simple configuration in which the open end of the supply hose is decentered from the center of the cross section of the existing pipeline. A uniform discharge of the abrasive can be performed over the entire inner peripheral surface of the road. This makes it possible to improve the cleaning efficiency by uniformly polishing the entire inner peripheral surface even in the case of an existing pipeline whose diameter greatly changes.

[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 describing an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a configuration of an abrasive supply section in the configuration shown in FIG. 1;

3A and 3B are diagrams for explaining a support structure at an opening of an existing pipeline in the configuration shown in FIG. 1, wherein FIG. 3A is a side view, and FIG. It is an arrow view of the direction shown by.

FIG. 4 is a schematic diagram for explaining a configuration of an abrasive discharge section in the configuration shown in FIG. 1;

FIG. 5 is an arrow view in a direction indicated by reference numeral (5) in FIG.

FIG. 6 is an arrow view in a direction indicated by reference numeral (6) in FIG.

FIG. 7 is a schematic diagram showing an example of a laid state in which pipelines having different diameters are used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Common drainage pipe equivalent to existing pipe line 2 Drainage basin 3 Suction machine 4 Abrasive accommodating part 5 Supply hose 5A Nozzle part forming discharge part 7 Adjustment valve for abrasive material 8 Adjustment valve for supply hose 9 Support member 9A Insertion guide Part 10 Shutter member 11 Discharge part support member 12 Rotatable annular joint member

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 591046261 Nissei Co., Ltd. 6-28-11 Minamioi, Shinagawa-ku, Tokyo (72) Inventor Takeo Sunohara 1-5-220, Kaigan, Minato-ku, Tokyo Tokyo Gas Stock In-house (72) Inventor Masataka Horiguchi 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Inventor Yoshihiro Kanno 4-9-1, Shiba, Minato-ku, Tokyo Shibahama Building Tosetsu Corporation (72) Inventor Haruo Iwasaki 4-9-4 Shiba, Minato-ku, Tokyo Shibahama Building Tosetsu Co., Ltd. (72) Inventor Nobukatsu Ike 3-18-3 Daikan, Yamato-shi, Kanagawa Prefecture HAKKO Technical Development Center Co., Ltd. (72) Inventor Kenji Oshima 3-18-3 Daikan, Yamato-shi, Kanagawa Inside the Hakko Technology Development Center Co., Ltd. (72) Inventor Seijiro Ohashi Shinagawa, Tokyo 6-28-11 Minamioi, Taniguchi Building Nisshinnai Co., Ltd. (72) Inventor Kazuya Hirabayashi 6-28-11 Minamioi, Shinagawa-ku, Tokyo Taniguchi Building Nisarinai F-term (reference) 2D063 FA01 FA07 4D075 AG04 AG21 AG26 BB03Y EA01 EA60

Claims (6)

[Claims] 1. An existing pipeline cleaning method for removing adhering matter on an inner surface of a pipeline by an abrasive conveyed on the inner surface of the existing pipeline, wherein a suction device is connected to one end of the existing pipeline in a laying direction. At the other end of the existing pipeline in the laying direction, an accommodating portion of the abrasive material communicating with the existing pipeline is arranged, and the abrasive material is supplied from the accommodating portion via a supply hose inserted into the existing pipeline. Cleaning the existing pipeline by suction-conveying into the existing pipeline, wherein the other end of the existing pipeline in the laying direction and the supply hose can adjust the amount of suction air generated by the suction device. Construction method. 2. The method for cleaning an existing pipeline according to claim 1, wherein the supply hose is moved in the existing pipeline in a direction in which the existing pipeline is laid, so that the abrasive is removed from the existing pipeline. A method for cleaning an existing pipeline, wherein the pipeline can be ejected toward the inner surface of the pipeline along the laying direction of the pipeline. 3. The method for cleaning an existing pipeline according to claim 1, wherein the amount of suction air on the existing pipeline side and the supply hose side is adjusted by changing an opening area of the existing pipeline and the supply hose. A characteristic cleaning method for existing pipelines. 4. The method for cleaning an existing pipeline according to claim 1 or 3, wherein the adjustment of the amount of sucked air on the side of the existing pipeline is provided at an opening end on the other end side in the laying direction of the existing pipeline. Adjustment of the suction air amount on the supply hose side is performed by a shutter member that is provided on a support member that supports the hose and that can be opened and closed,
A method of cleaning an existing pipeline, wherein the cleaning is performed by an adjustment valve located behind the housing in the direction of movement of the abrasive in the supply hose. 5. The method of cleaning an existing pipeline according to claim 1, wherein the supply hose has an open end positioned in the existing pipeline when an abrasive is discharged. A cleaning method for an existing pipeline, wherein the polishing method is provided so as to be rotatable in a circumferential direction by using a generated reaction force, and discharges an abrasive over the entire circumferential direction. 6. The cleaning method for an existing pipeline according to claim 5, wherein an opening end of the supply hose in the existing pipeline is eccentric from a cross-sectional center of the existing pipeline, and is parallel to a diameter direction of the existing pipeline. A method of cleaning an existing pipeline characterized by being directed toward an inner surface of the existing pipeline in a state where the pipeline is installed.