JP5167206B2 - Pipe cleaning bag and pipe cleaning method - Google Patents

Description

  The present invention relates to a pipe cleaning bag used for cleaning the inner surface of a pipe such as a water pipe buried in the ground, and a pipe cleaning method using the bag.

  As a method for cleaning the inner surface of a pipe such as a water pipe buried in the ground, for example, as disclosed in Patent Document 1, a cleaning method using a cleaning tool that is inflated with air is known. This cleaning tool is made by covering the outer periphery of a rubber bag with a wire mesh, and the cleaning method is to insert a folded cleaning tool into a pipe through a branch pipe and fill it with compressed air. After inflating the water, water is allowed to flow in the pipe and the cleaning tool is slid in the pipe. As a result, the wire mesh pressed against the inner surface of the pipe strips off foreign matters such as water scale and rust.

Japanese Examined Patent Publication No. 4-66630

However, the cleaning tool is not highly contractible because the outer periphery is covered with a metal mesh, and is bulky even when compressed air is removed. In general, in a water pipe, even if the nominal diameter of a branch pipe connected to the pipe to be cleaned is large, it is as thin as 100 mm. Therefore, if the nominal diameter of the pipe exceeds 300 mm, a cleaning tool of a size corresponding to this Even when contracted, it becomes difficult to insert into the branch pipe. Therefore, the nominal diameter of the piping that can be used with the cleaning tool is only 75 mm to 300 mm.
Further, the inner bag exposed through the wire mesh may be damaged, and there is a problem in durability.

  Accordingly, the present invention provides a pipe cleaning bag body having high shrinkage that can be used for cleaning via a branch pipe even if the pipe has a nominal diameter exceeding 300 mm, and a bag body having excellent durability. It aims at providing the piping washing method using this.

In order to achieve the above object, the invention described in claim 1 is inserted into a pipe buried in the ground, swells by supplying compressed fluid, presses the inner surface of the pipe, and supplies the fluid in the pipe. A pipe cleaning bag body that slides in the pipe to clean the inner surface, and covers a rubber inner bag to which a compressed fluid is supplied, and the inner bag, a fibrous material, a resin material, While having a multiple structure consisting of at least one outer bag formed of any of the rubber materials , on the inner bag, a cylindrical portion having the same diameter over the entire length in the sliding direction in the pipe, It is characterized by being formed with a length of ½ or more of the inner diameter of the pipe .
The invention according to claim 2 is characterized in that, in the configuration of claim 1 , the outermost outer bag is detachable.
In order to achieve the above object, the invention according to claim 3 is the pipe cleaning bag body according to claim 1 or 2 , wherein the pipe cleaning bag body according to claim 1 or 2 is inserted into the underground pipe. After the compressed fluid is supplied to the inner bag and inflated, the fluid is supplied into the pipe and the pipe cleaning bag body is slid in the pipe.

According to the first and third aspects of the invention, since the pipe cleaning bag body is highly contractible, it can be used for cleaning the pipe through a thin branch pipe even if the pipe has a nominal diameter exceeding 300 mm. Moreover, since an inner bag is not exposed outside, suitable durability can be maintained.
Furthermore , since the tubular portion is formed on the inner bag, the pipe cleaning bag body is not inclined and stopped, and the sliding speed is not lowered, and good slidability in the pipe is obtained.
According to the second aspect of the invention, in addition to the effect of the first aspect , the outermost outer bag can be attached and detached, so that the damaged outermost outer bag can be easily replaced, and the pipe cleaning is related. Workability is improved.

It is a general view of a pipe cleaning bag. It is an A section enlarged view. It is sectional drawing of the bag body for piping washing | cleaning. It is an expanded sectional view of a hose part. It is explanatory drawing of the piping washing | cleaning method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A pipe cleaning bag body (hereinafter simply referred to as “bag body”) 1 illustrated in FIG. 1 includes a bag portion 2 to which compressed air is supplied and a hose portion 3 connected to the bag portion 2.
First, as shown in FIG. 2, the bag portion 2 has an oval longitudinal cross section, and a rear end (here, the right side in FIG. 1 is the front side and the left side is the rear side) that is a front aperture is made of rubber. The inner bag 4, the outer bag 5 made of polyester having the same shape as the inner bag 4, covering the inner bag 4 from the outside and opening the tapered rear end, and substantially the same as the outer bag 5. The outer bag 5 has a shape, and has a triple structure including an outermost bag 6 made of polyester with a tapered rear end opening.
A cylindrical portion 7 having an equal diameter over the entire length in the front-rear direction is formed at the center of the outer surface of the inner bag 4. The length of the cylindrical portion 7 in the front-rear direction is ½ or more of the inner diameter of the pipe to be cleaned.

  Next, as shown in FIGS. 3 and 4, the hose portion 3 has a high-pressure hose 8 to which a hose nipple 9 is connected at the rear end and an air hose described later can be connected. The bag part 2 is connected. Here, the open ends of the bags 4 to 6 are formed so as to cover the ends of the high-pressure hose 8 longer as the outer bags are covered, and the open ends of the bags 4 to 6 are overlapped on the high-pressure hose 8 and covered. The three fixed bands 12 to 14 are wound and connected from the outside.

  That is, in the front portion where the opening ends of the three bags 4 to 6 overlap, after fixing the fixing ring 10 from the outside of the outer bag 5 first, the large diameter is formed from the outside of the outermost bag 6 at the same front-rear position. The fixing band 12 is tightened, and at the intermediate portion where the opening ends of the two bags 5 and 6 overlap, the fixing ring 11 is first crimped from the outside of the outer bag 5 and the outer bag 6 is fixed at the same front and rear position. The medium-diameter fixed band 13 is tightened from the outside, and the small-diameter fixed band 14 is tightened at the rear portion of the outermost bag 6 which is only the open end. A core bar 15 is inserted into the front end of the high-pressure hose 8 to prevent the high-pressure hose 8 from being crushed when the fixing rings 10 and 11 are crimped.

  A wire 16 is inserted into the high pressure hose 8. This wire 16 is for reinforcing the high-pressure hose 8, the rear end is near the end of the hose nipple 9, and the front end is a shaft of the high-pressure hose 8 by wire stoppers 17, 17 fixed to both ends in front of the high-pressure hose 8. Held in heart. Here, the high pressure hose 8 is prevented from being blocked by the wire stopper 17 by a plurality of washers 18, 18. Further, a sleeve 19 that presses the opening end of the inner bag 4 from the inner side is caulked and fixed to the front end of the high-pressure hose 8 to suppress the axial displacement of the inner bag 4.

  By inserting the wire 16 into the high-pressure hose 8 in this way, the air hose is caught when pulling the air hose and pulling the bag body 1 back in the pipe or when the bag body 1 slides in the pipe when the pipe is washed. Even if a tensile load is applied to the high-pressure hose 8 at the time, the wire 16 bears this to prevent the high-pressure hose 8 from being stretched or buckled. Therefore, the strength of the high pressure hose 8 is ensured.

A pipe cleaning method using the bag body 1 configured as described above will be described below.
In FIG. 5, reference numeral 20 denotes a main pipe (water pipe) that is buried in the ground and serves as a pipe to be cleaned. On the upstream side (left side in FIG. 5) and downstream side, gate valves 21 and 21 are provided, respectively. It has been. In addition, 22 and 22 are branch pipes branched from the main pipe 20, and a fire hydrant 24 is provided via a repair valve 23, respectively. In the upstream branch pipe 22, the fire hydrant is removed and a relay pipe 25 is connected. .
On the other hand, in the bag body 1, one end of the air hose 26 is connected to the hose nipple 9 and the other end of the air hose 26 is connected to the pump 27. 28 is a pressure gauge.

First, with the gate valves 21 and 21 closed, the water pressure in the main pipe 20 is released, the operation of the pump 27 is stopped and the bag body 1 is contracted, and the bag body 1 is connected to the relay pipe 25 as shown by the dotted line. The bag body 1 is inserted into the main pipe 20 from the branch pipe 22. Here, since the bag body 1 is formed of rubber and polyester fiber, the bag body 1 is highly contractible, and even the thin branch pipe 22 can be inserted without any trouble.
In this state, the pump 27 is discharged and compressed air is supplied to the bag body 1 through the air hose 26. Then, compressed air blows out from the high-pressure hose 8 into the inner bag 4 to inflate the inner bag 4. Thereby, the outer bag 5 and the outermost bag 6 also follow and inflate, and the cylindrical portion 7 is pressed against the inner surface of the main pipe 20 through the outer bag 5 and the outermost bag 6. When the supply pressure reaches a predetermined value, the discharge operation of the pump 27 is stopped.

  Then, the upstream gate valve 21 is opened and water is allowed to flow through the main pipe 20, while water is discharged from the downstream fire hydrant 24, and the bag body 1 is moved downstream as indicated by the dotted line by the water pressure. At this time, since the outermost bag 6 slides in a state in which the outermost bag 6 is pressed against the inner surface of the main pipe 20 by the inner bag 4, the outermost bag 6 peels off water stains, rust, etc. on the inner surface. Move together downstream. In particular, here, since the cylindrical portion 7 presses the inner surface of the main pipe 20 through the outer bag 5 and the outermost bag 6, the bag body 1 may be tilted and stopped or the sliding speed may be reduced. It slides smoothly in the main pipe 20.

When the bag body 1 reaches the downstream end of the main pipe 20, the water is discharged from the downstream branch pipe 22 through the fire hydrant 24. Thereby, the removed scale and rust are also discharged to the outside.
Thereafter, when the upstream side gate valve 21 is closed and the pump 27 is operated for suction, the air in the inner bag 4 is sucked and discharged to the outside, so that the bag body 1 contracts. When the air hose 26 is pulled here, the bag body 1 can be moved to the upstream side and pulled out via the branch pipe 22 and the relay pipe 25.

  Even if the outermost bag 6 slidably contacting the inner surface of the main pipe 20 is damaged by this cleaning, the inner bag 4 is protected by the outer bag 5, so that the inner bag 4 can be prevented from being damaged. The outer bag 5 also plays a role of maintaining the shape when the bag body 1 is inflated. Furthermore, if only the outermost bag 6 is replaced by removing the fixing bands 12 to 14, the bag body 1 can be reused. This replacement can be similarly performed when the outer bag 5 is damaged. Therefore, not only at the time of damage, but also by taking into account the material of the main pipe 20 to be cleaned, the adhesion state of foreign matter, etc., it is possible to replace the outermost bag 6 having a different material, hardness, etc.

  Thus, according to the bag body 1 and the pipe cleaning method of the above embodiment, the bag body 1 is formed of polyester, covering the rubber inner bag 4 to which the compressed air is supplied, and the entire circumference of the inner bag 4. In order to obtain a high contractibility by adopting a multi-layer structure composed of the outer bag 5 and the outermost bag 6, the main pipe 20 is passed through the thin branch pipe 22 even if the main pipe 20 has a nominal diameter exceeding 300 mm. Can be used for cleaning. Moreover, since the inner bag 4 is not exposed to the outside, suitable durability can be maintained.

Here, in particular, the cylindrical portion 7 having an equal diameter over the entire length in the sliding direction in the main pipe 20 is formed in the inner bag 4 with a length that is 1/2 or more of the inner diameter of the main pipe 20. Therefore, the bag body 1 does not stop tilting and the sliding speed does not decrease, and good slidability within the main pipe 20 is obtained.
In addition, since the outermost bag 6 is detachable, the damaged outermost bag 6 can be easily replaced, and the workability related to pipe cleaning is improved.

  The bag body is not limited to a triple structure, but a double structure in which the inner bag is covered with only one outer bag, or a quadruple structure in which the inner bag is covered with three or more outer bags. There is no problem. Further, as the material of the outer bag, a fibrous material other than polyester can be used, and not only the fibrous material but also a resin material or a rubber material can be used. Therefore, in the above embodiment, only the outermost outer bag can be made of a fibrous material and the inner outer bag can be made of rubber, or the two outer bags can be made of rubber or synthetic resin. In addition, the outermost outer bag should use a rubber that is harder than the inner bag, or give grooves or irregularities to the surface of the rubber or synthetic resin in order to increase the cleaning ability of the inner surface of the pipe. Is also possible.

In addition, the form of the hose part can be changed as appropriate, such as omitting the wire or eliminating the high-pressure hose and directly connecting the air hose to the bag part. Further, the present invention is not limited to a configuration in which the air hose is connected, but the configuration in which only the bag portion is slid after the compressed fluid is supplied, after the compressed fluid is supplied, as disclosed in Patent Document 1. However, the bag of the present invention can be used.
The object of pipe cleaning is not limited to the water supply pipe, but may be other pipes such as a sewer pipe and an industrial water distribution pipe. The compressed fluid supplied to the bag body includes nitrogen and other compressed air. An inert gas such as helium can also be used.

  On the other hand, the pipe cleaning method is not limited to the above embodiment, and can be changed as appropriate. For example, in the above embodiment, after the bag body reaches the downstream end of the main pipe and closes the upstream gate valve, the pump is sucked to contract the bag body, but the procedure for simply stopping the pump operation It is good. Also in this case, the bag body is easily contracted by water pressure due to its high contractibility, and can be pulled out through the branch pipe and the relay pipe.

  1 .. Bag body for pipe cleaning, 2 .. Bag part, 3 .. Hose part, 4 .. Inner bag, 5 .. Outer bag, 6 .. Outer bag, 7. High pressure hose, 12-14 ... Fixed band, 16 ... Wire, 20 ... Main pipe, 21 ... Gate valve, 22 ... Branch pipe, 25 ... Relay pipe, 26 ... Air hose, 27 ... Pump.

Claims (3)

A pipe that is inserted into a pipe buried in the ground, bulges by the supply of compressed fluid, presses the inner surface of the pipe, and slides in the pipe by the supply of fluid in the pipe to clean the inner surface A cleaning bag,
A multiplex composed of an inner bag made of rubber to which the compressed fluid is supplied and at least one outer bag that covers the entire circumference of the inner bag and is formed of any one of a fibrous material, a resin material, and a rubber material. While with structure ,
In the inner bag, a cylindrical portion having an equal diameter over the entire length in the sliding direction in the pipe is formed with a length of ½ or more of the inner diameter of the pipe. Bag body. 2. The pipe cleaning bag according to claim 1 , wherein the outermost outer bag is detachable. The pipe cleaning bag according to claim 1 or 2 is inserted into a pipe buried in the ground, and a compressed fluid is supplied to the inner bag of the pipe cleaning bag to inflate the pipe. A pipe cleaning method, wherein a fluid is supplied to the pipe and the bag body for pipe cleaning is slid in the pipe.

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