JPH10118594A - Cleaning method for existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate the occurrence of clogging of a polishing material so as to prevent the degradation in a polishing function and to enable the execution of polishing commonly with a continuity test of a cable by connecting a suction device to an aperture at one end of a pipeline and moving a polishing pig in the pipeline while working this suction device. SOLUTION: A drill 5 is connected to a driving device 4 to a rotationally drivable state. The polishing member 7 is previously integrated with a pushing member 6 and is inserted from the opening end of the pipeline 1 existing in a manhole 2. When the suction device 9 is started, in-pipe air is formed toward the suction device 9 side. When the polishing member 7 is rotated by a drill and is begun to move in the pipeline 1 via a pushing member 6, the inside surface of the pipeline 1 is ground by a grinding wheel of the polishing member 7. The polishing powder, such as rust or slag, generated by the grinding is expelled by the suction device. As a result, the need for carrying out the work to expel the polishing debris after the polishing is eliminated and the labor of the work is lessened.

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 pipeline, and more particularly, to a cleaning method for removing foreign matter such as rust or slag adhered to the inner surface of a pipeline or a bent portion by polishing. .

[0002]

2. Description of the Related Art Pipes buried underground include communication pipes and power pipes for inserting communication cables and power transmission cables in addition to gas pipes and water pipes. The communication pipeline and the power pipeline are connected to each other via a joint in a laying section, and a communication cable or a power transmission cable covered with the tube is inserted therein.

[0003] By the way, in the existing pipeline, when the burial period is long, the deterioration phenomenon due to corrosion and the like progresses, and a defective portion such as a leak hole is generated in the pipe. Rust may occur on the road surface. Further, in the case of a pipe line connected via a joint, the pipe line may be cut or bent at the joint portion due to the pressure from the ground, and the end of the pipe may be bent. The edge may protrude into the pipe, and the cable may not be able to be inserted. Therefore, a cleaning method is employed in which the inner surface of the conduit is polished to remove rust and slag before the cable is inserted. As an example of the cleaning method, there is a method in which a polishing member made of a polishing material is inserted into a pipe, and the outer surface of the polishing pig is brought into contact with the inner surface of the pipe to be moved.

[0004]

However, in the above-mentioned cleaning method, rust or slag removed by the polishing pig may accumulate on the surface of the polishing material, causing so-called clogging, which may deteriorate the polishing function. There is. Also, after cleaning, a penetration test must be performed to determine whether the cable is ready for penetration.

In view of the above problems in the conventional cleaning method, it is an object of the present invention to prevent the abrasive material from being clogged and to prevent a decrease in the polishing function. An object of the present invention is to provide a method of cleaning an existing pipeline that also serves as a cleaning method.

In order to achieve this object, the invention according to claim 1 is a method of cleaning an existing pipeline in which rust and slag adhering to the inner surface of the existing pipeline are removed by polishing with an abrasive. A polishing pig having an outer diameter slightly smaller than the inner diameter of the pipe is introduced into the pipe, a suction device is connected to one end opening of the pipe, and the polishing pig is operated while operating the suction device. It is characterized in that it is constructed so as to be moved in the pipeline.

According to a second aspect of the present invention, the polishing member includes:
It is characterized by having an end portion formed in a substantially conical shape and a body portion formed in a substantially cylindrical shape.

The invention according to claim 3 is characterized in that the body of the polishing member is formed by connecting a plurality of cylindrical abrasives having a required width.

[0009]

According to the first aspect of the present invention,
First, the suction device is connected to one end opening of the pipeline, and the polishing member is moved in the pipeline while operating the suction device. At this time, an air flow is generated in the pipeline by the suction action of the suction device. For this reason, a drying action by the air flow acts on the inner surface of the conduit, so that the pipe is easily polished. Further, the polishing powder pieces removed from the inner surface of the pipe by the movement of the polishing member are discharged out of the pipe by a high-speed air flow. Further, since the space between the inner surface of the polishing member and the inner surface of the pipe is extremely small, a high-speed air flow is generated. Therefore, the polishing powder pieces deposited on the outer surface of the polishing member are removed by the high-speed air flow.

According to the second aspect of the present invention, the polishing member has an end portion formed in a substantially conical shape and a body portion formed in a substantially cylindrical shape. Even when the polishing member approaches a portion where the inner diameter of the conduit is small in the portion, the polishing can be performed with the substantially conical tapered surface. Also, by the passage of the body in the pipeline,
It is possible to confirm that the cable can be inserted.

In the invention according to claim 3, the body of the polishing member is formed by connecting a plurality of cylindrical abrasives having a required width. Abrasion and abrasion can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is a schematic view for explaining a cleaning method according to the present invention, and FIGS. 2 and 3 are cross-sectional views showing a relationship between a polishing member and a pipe used in the cleaning method shown in FIG. . In FIG. 1, in the cleaning method according to the present invention, manholes 2 and 3 are provided at both ends in the extending direction of a pipe 1 to be polished. A drill 5 driven by air or electric power by a driving device 4 such as a compressor or a generator installed on the ground and having a slide mechanism is provided in one manhole 2 where one opening in the extension direction of the pipeline 1 is located. A push-in member 6 made of a piano wire having a diameter of 9 mm or a rod member equivalent thereto is connected to a rotating portion of the drill 5. The pushing member 6 has such a rigidity that it can be moved forward and backward by a rotating and sliding mechanism by the drill 5. Further, the pushing member 6 is configured so that it can be added in accordance with the length of the conduit 1.

A polishing member 7 is fixed to the tip of the pushing member 6. As shown in FIGS. 2 and 3, the polishing member 7 includes a plurality of cylindrical grindstones 7a, 7b, and 7c connected along the traction direction. Grinding stones 7b, 7c located at the rearmost end
Has a conical shape in which the edges on the upstream and downstream sides in the traction direction are tapered, and the remaining grindstone 7a has a cylindrical shape. Further, the outer diameter of each of the grindstones 7a, 7b, 7c is slightly larger than the outer diameter of the cable inserted into the pipeline 1 and slightly smaller than the inner diameter of the pipeline 1. Is set. In this embodiment, when the outer diameter of a cable (not shown) inserted into the pipeline 1 is 70 mm, the outer diameter is set to be approximately 3 to 5 mm larger than the outer diameter. Has an outer diameter that allows a slight gap to be formed between the inner diameter and the inner diameter. Further, the length in the pulling direction of the polishing member 7 obtained by connecting the respective grindstones is determined according to the outer diameter of the cable inserted into the pipeline 1, and in this embodiment, the outer diameter of the cable Is 70 mm, the length of the polishing member 7 in the pulling direction is 30 cm. This takes into account the fact that the polishing member 7 can pass through the step or the bent portion even when the conduits have a step or bent deformation at the joints 8 and 8 ′ shown in FIGS. 2 and 3. It is.
Further, the arrangement of the grindstones 7a can be rearranged. In particular, since the grindstones 7a at the end portions are severely worn, the arrangement is rearranged to prevent local wear.

A duct 10 extending from the suction device 9 is connected to the other manhole 3 at the other end in the extension direction of the conduit 1 at the other end of the manhole 3 where the other end of the conduit 1 in the extension direction is located. The suction device 9 serves to reduce the pressure on the upstream side in the moving direction (the direction indicated by the arrow in FIG. 1) of the polishing member 7 when the polishing member 7 is moved, with the polishing member 7 located in the pipeline 1 as a boundary. Accordingly, an air flow in the pipe is generated in the pipe 1.

In the present embodiment, the following procedure is executed by using the above configuration. First, a drill 5 is installed in one manhole 2, and the drill 5 is connected to the driving device 4 so as to be rotatable. The polishing member 7 is integrated with the pushing member 6 in advance and inserted from the open end of the conduit 1 located in the manhole 2. Next, when the suction device 9 is started, air in the pipe is generated toward the suction device 9 side. At this time, a drying action is performed on the inner surface of the conduit 1 by the air flow, and the polishing effect of the polishing member 7 is improved. On the other hand, when the polishing member 7 is rotated by the drill 5 and starts moving in the pipeline 1 via the pushing member 6, the inner surface of the pipeline 1 is ground by the grindstones 7a, 7b, 7c of the polishing member 7, and the grinding is performed. Abrasive powder such as rust and slag generated by this is removed by the suction device 9. Further, the polishing powder accumulated on the outer surface of the polishing member 7 is removed from the outer surface of the polishing member by a high-speed airflow passing through a very narrow gap formed between the outer surface of the polishing member 7 and the inner surface of the pipe 1. It is separated from the surface and flows into the suction device 9. Therefore, it is possible to prevent a decrease in polishing performance due to clogging of the polishing powder. Although not shown here, it is assumed that the suction device 9 includes a storage duct that stores the polishing powder.

As shown in FIGS. 2 and 3, when the polishing member 7 passes through the bent portions of the joint portions 8 and 8 ', first, the polishing member 7 is inserted into the pipe by the tapered surface of the grindstone 7c formed in a conical shape. Polish the protruding tube edge. Then, by pushing the polishing member 7 while rotating it, it is confirmed that the grindstone 7a passes and the cable can be inserted into the pipeline 1.

[0017]

As described above, according to the first aspect of the present invention, since the air flow is generated in the pipeline by the suction action of the suction device, the drying action by the air flow acts on the inner surface of the pipeline. , So that it is easy to polish. Further, the polishing powder pieces removed from the inner surface of the pipe by the movement of the polishing member are discharged out of the pipe by a high-speed air flow. Further, since the space between the inner surface of the polishing member and the inner surface of the pipe is extremely small, a high-speed air flow is generated. Therefore, the polishing powder pieces deposited on the outer surface of the polishing member are removed by the high-speed air flow. As a result, there is no need to perform the operation of removing the polishing powder pieces after polishing, and the work labor can be reduced.

According to the second aspect of the present invention, the polishing member has an end portion formed in a substantially conical shape and a body portion formed in a substantially cylindrical shape. Even when the polishing member approaches a portion where the inner diameter of the conduit is small in the portion, the polishing can be performed with the substantially conical tapered surface. Also, by the passage of the body in the pipeline,
It is possible to confirm that the cable can be inserted.

Further, in the invention according to the third aspect, the body of the polishing member is formed by connecting a plurality of cylindrical abrasives having a required width. Abrasion and abrasion can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view for explaining a cleaning method according to an embodiment of the present invention.

FIG. 2 is a local sectional view for explaining a relationship between a polishing member and a pipe used in the cleaning method shown in FIG.

FIG. 3 is a local cross-sectional view for explaining another example of the relationship between the polishing member and the conduit used in the cleaning method shown in FIG.

[Description of Signs] 1 Pipeline 5 Drill 6 Push-in member 7 Polishing member 9 Suction device

Claims (3)

[Claims] 1. A method for cleaning an existing pipeline by polishing and removing rust and slag adhering to an inner surface of the existing pipeline with a polishing member, wherein an outer diameter slightly smaller than an inner diameter of the pipeline is opened from one end opening of the pipeline. Introducing a polishing member having the same into the pipeline, connecting a suction device to one end opening of the pipeline, and moving the polishing pig in the pipeline while operating the suction device. Cleaning method for existing pipeline. 2. The existing pipe line according to claim 1, wherein the polishing member has an end portion formed in a substantially conical shape and a body portion formed in a substantially cylindrical shape. Cleaning method. 3. The body portion of the polishing member is formed by connecting a plurality of cylindrical abrasives having a required width.
Cleaning method of existing pipeline described.