JP2923482B2 - Method and apparatus for cleaning water pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning a water supply pipe.

[0002]

2. Description of the Related Art As a method for cleaning a water distribution pipe of a water supply system, a polypig cleaning method, a high-pressure cleaning method, and the like are known.

In the polypig washing method, first, a water control valve around the section to be washed is closed in order to make the section to be washed out of water. For example, as shown in FIG. 9, when the water distribution pipes are arranged like meshes, the water control valves 2A, 2B, 2D, 2
E, 2G, and 2H are closed to create a water cut section. Thereafter, holes are made in the water distribution pipe at the right side near the water control valve 2A and the left side near the water control valve 2G, and a polypig is inserted from one of the holes. Insert a cleaning tool called. Next, the hole into which the polypig is inserted is closed, and the water control valve close to the hole is opened to supply water into the water distribution pipe that has been disconnected. The polypigs are washed away by the incoming water and emerge from the pipe through another hole, cleaning the inner wall of the pipe. Thereby, the section W1 in FIG. 9 can be cleaned.

In the high-pressure washing method, similarly to the polypig washing method, a hole is formed in a water distribution pipe in a section where water is cut off, and washing is performed from one hole using a high-pressure washing device. That is, a hose having a nozzle for spraying high-pressure water from the tip is inserted into the water pipe through the above-described hole. Then, by extending the hose, the tip of the nozzle advances in the water pipe, and cleans the inner wall of the water pipe with high-pressure water.

[0005]

In the conventional polypig washing method, if the water pipe is branched between a place where the polypig is put in and a place where the polypig is put out, the polypig may flow toward the branch. there were. For example, in FIG. 9, since the water distribution pipe branches at two points in the section W1, the course of the polypig bends at the branch, and the water control valves 2A, 2D,
In some cases, the vehicle traveled in the direction of 2E or 2H, and the whereabouts of the polypig could not be understood. For this reason,
Sometimes finding and removing a polypig was time-consuming. To avoid this, control valves 2C and 2C
It was necessary to close F and cut off water only in the section sandwiched by F, and to perform cleaning in the cut-off section. For this reason,
In order to wash a mesh-shaped water pipe having a total length of several km, a long time and a great deal of labor were required, and a large amount of water wasted.

Further, in the conventional high-pressure cleaning method, the nozzle is connected by a hose, so that the length that can be cleaned at one time is 100 m.
However, there were similar problems.

The present invention provides a method and an apparatus for cleaning a water pipe, which can solve such a problem.

[0008]

According to a method of cleaning a water pipe according to the present invention, a pig is inserted into the water pipe from a first position of the water pipe in a water-cut state, and the pig is propelled in the water pipe. Removing the pig from a second location of the water pipe to clean the water pipe between the two locations, wherein when propelling the pig in the water pipe, the first While supplying air into the water distribution pipe from a location, opening a water control valve near the first location to supply water into the water distribution pipe that has been cut off, and from the second location in the water distribution pipe. It is characterized by sucking water and air.

A water pipe cleaning apparatus according to the present invention is an apparatus used at a second point in the water pipe cleaning method according to the present invention, wherein an outlet pipe connectable to the second point is provided. Having a hose connected to the take-out pipe, a tank connected to the hose, a pump connected to the tank for sucking water and air, and a pig take-out pipe connected to the hose. It is a feature.

According to the present invention, air is sucked from the second location so that the inside of the water distribution pipe is evacuated, and air is sent from the first location into the water distribution pipe. At the same time, the water in the distribution pipe is sucked in from the second location, and the water is sent into the distribution pipe from the water control valve near the first location. The pig inserted into the water distribution pipe from the first location moves in the water distribution pipe due to the flow of water and air formed between the first location and the second location, and reaches the second location. The pig cleans the inside of the pipe as it moves through the pipe. In addition, the water sent into the water pipe collides with pigs and air pockets,
It reciprocates in the water pipe and cleans the inside of the water pipe by its action.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing an outline of a method for cleaning a water distribution pipe to which the present invention is applied. In the present embodiment, when cleaning the water distribution pipe 1, the water control valve 2 and the water control valve 3 are closed, and the water control valve 2 is closed.
And the section between the water control valves 3 is cut off. And
A pig insertion portion (hereinafter simply referred to as an insertion portion) 4 is provided in the water distribution pipe 1 near the water control valve 2 in the water cutoff section, and the pig insertion side device 6 is connected thereto. A pig take-out part (hereinafter simply referred to as a take-out part) 5 is provided in the water distribution pipe 1 near the water control valve 3 in the water cutoff section, and the pig take-out side device 7 is connected thereto.
The pig insertion side device 6 is inserted into the water distribution pipe 1 from the insertion portion 4.
Insert the pig . By opening the water control valve 2, the pig inserted into the water distribution pipe 1 flows through the inside of the water distribution pipe 1 to reach the pig take-out side device 7, and is taken out therefrom.

Here, the length from the water control valve 2 to the insertion portion 4 and the length from the water control valve 3 to the extraction portion 5 are all 100.
m, and the drainage pipe in this part is washed by a high pressure washing method. The insertion unit 4 and the extraction unit 5 use a fire hydrant, a mud spout valve, or the like provided at an appropriate position of the water distribution pipe 1 if it is provided. If a fire hydrant or a mud spout valve is not provided, a water-stop valve (water-stop valve) is attached in advance.

FIG. 2 shows details of the pig insertion side, and FIG.
It is a detail of the pig take-out side. Here, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those used in FIG.
In this case, both the insertion part and the take-out part are non-discharge valves 4
1 and a non-stop valve 51 are used.

As shown in FIG. 2, the pig insertion side device 6
Is a substantially cylindrical device main body 61 and an insertion pipe 62 provided at a lower portion of the device main body 61 and connected to the non-water shutoff valve 41.
, A valve (valve) 63, a water pressure gauge 64, and a valve 65 attached to a pipe-shaped portion protruding laterally of the apparatus main body 61.
And a lid 66 provided at the upper end of the apparatus main body 61.

The apparatus main body 61 is made of metal and has a width of 3 mm.
A pipe-shaped portion of the book is integrally protruded. The insertion pipe 62 is made of a synthetic resin such as transparent vinyl. The main body 61 and the insertion pipe 62 are detachable.
The lid 66 is also made of synthetic resin such as vinyl,
It is detachable. Here, the diameter of the water distribution pipe 1 is 100 m
In the case of m, the diameter of the device main body 61 is 75 mm, and the diameter of the insertion pipe 62 is 50 mm.

Water output from a high-pressure pump (not shown) is supplied into the apparatus main body 61 through a valve 63. Valve 63 regulates the flow rate of this water. The water pressure gauge 64 measures the pressure of the water supplied into the apparatus main body 61.

When the valve 65 is opened, external air (atmosphere) is supplied into the apparatus main body 61. You may comprise so that air may be forcibly sent by a pump.

As shown in FIG. 3, the pig take-out side device 7 includes a take-out pipe 71 connected to the non-discharge valve 51, a hose 72 connected to the take-out pipe 71, and a pressure adjusting tank connected to the hose 72. 73 are provided. The pump 77 and the valve 7 are connected to the pressure adjusting tank 73 via a hose.
8 and a check valve 79 via another hose. Further, an overpipe 74 is branched from a hose 72 upstream of the pressure adjusting tank 73 and connected thereto , and a pig take-out pipe 76 is connected downstream of the overpipe 74.

The take-out pipe 71 is made of a synthetic resin such as transparent vinyl. The hose 72 is made of a transparent and flexible synthetic resin such as vinyl. The pressure adjusting tank 73 functions as a buffer device that prevents water and air flowing from the water pipe 1 into the hose 72 from being directly sent to the pump 77. The overpipe 74 has a function of discharging water overflowed in the hose 72 to the outside. That is,
The check valve 75 provided in the overpipe 74 is usually provided with a pump 7
Although it is closed by the negative pressure generated by the operation of 7, when a large amount of water flows into the hose 72 through the water pipe 1 when the water control valve 2 on the insertion side is opened, it is opened by the water pressure. When the check valve 75 opens, a part of the water flowing into the hose 72 is discharged from the over pipe 74 to the outside. The pump 77 is constituted by a vacuum pump, a drainage pump, or the like, and sucks out water and air accumulated in the pressure adjusting tank 73 and discharges them to the outside. The check valve 79, like the check valve 75, discharges the overflowed water. A foot valve may be provided instead of the check valve 79.

FIG. 4 is a flowchart showing a procedure for cleaning the water distribution pipe 1. Hereinafter, a procedure for cleaning the water distribution pipe 1 will be described with reference to FIGS. In addition, before starting this procedure, the water stop valve 41 and the water stop valve 5 are set in advance.
1, the water control valve 2 and the water control valve 3 are then closed to set a water cut section.

[0022] First, in the pig insertion side device 6, peak
The plug 8 is inserted into the water pipe 1. Further, the pig take-out side device 7 sucks water and air in the water distribution pipe 1. (Step S1).

[0023] That is, the pipes for the insertion and the apparatus body 61 6
After connecting the insertion pipe 62 to the non-water shutoff valve 41, the pig 8 is manually pushed in from the upper end of the apparatus main body 61. Then, after closing the lid 66, the valve 63 is opened to feed high-pressure water. Leave valve 65 closed. The pig 8 pushed into the apparatus main body 61 is pushed downward by the force of high-pressure water, and reaches the inside of the water distribution pipe 1 having a diameter of, for example, 100 mm through an insertion pipe 62 having a diameter of, for example, 50 mm. When pig 8 reaches the water pipe 1, the pressure is rapidly reduced, by looking at the value of the pressure gauge 64, pig 8
Has reached the water distribution pipe 1. When the pig 8 reaches the inside of the water distribution pipe 1, the valve 63 is closed to stop feeding water. At this time, since the water and the air in the water pipe 1 are sucked by the pump 77 on the outlet side, when the pig 8 reaches the inside of the water pipe 1, it is sucked by the outlet side. It does not go in any direction.

Next, the water control valve 2 is opened to feed water into the water pipe 1, and the valve 65 is opened to send air into the water pipe 1. On the extracting side, the pump 77 is operated to suck water and air in the water distribution pipe 1 (step S2). That is, a flow of water and air is formed between the insertion side and the extraction side.

Here, if the altitude of the insertion side device 6 is higher than or equal to the altitude of the extraction side device 7, air naturally flows into the water distribution pipe 1 from the valve 65. Also,
Even if the insertion-side device 6 is slightly lower, the pump 77 of the extraction-side device 7
As a result, the air in the water distribution pipe 1 is in a thin state, so that the air naturally enters the water distribution pipe 1. However, when the altitude of the insertion-side device 6 is lower than the altitude of the extraction-side device 7 by a certain degree or more, since air does not naturally enter, a pump is connected to forcibly send air. In any case, the volume ratio of water to air in the water distribution pipe 1 is 1:
Adjust the amount of water and air sent to about 1.
Whether the volume ratio of water and air is appropriate is determined, for example, from the flow of water and air in the hose 72 on the outlet side.

The pig 8 inserted in the water pipe 1 moves inside the water pipe 1 along the flow of water and air formed between the insertion side and the take-out side. Then, in the process, the inner wall of the water distribution pipe 1 is cleaned. Furthermore, water is reciprocated in the water distribution pipe 1 by introducing air into the water distribution pipe 1, and the action removes dirt in the water distribution pipe 1. This operation is the same as, for example, when putting water in a single bin and washing, leaving the air without filling the single bin with water and shaking the bottle to perform washing. Water to reciprocate within the water pipe 1, the water pip
In some cases, the water may collide with the air pipe 8 and return. However, it is considered that the flow of water is further interrupted and returned to the air reservoir generated in the water distribution pipe 1. Then, the air reservoir moves in the water distribution pipe 1 and is finally discharged from the outlet side, but the flow of water changes in accordance with the movement of the air reservoir.

If the operation of feeding water and air into the water distribution pipe 1 is continued as described above, the pig 8 will eventually move to the non-stop valve 51.
From the extraction side device, and reaches an extraction tube 76 through an extraction pipe 71 and a hose 72. When the pig 8 reaches the extraction pipe 76, the operation of the pump 77 of the extraction-side device 7 is stopped to stop the suction of water and air. Further, on the insertion side, the water control valve 2 is closed to stop the supply of water, and the valve 65 is closed to stop the supply of air (step S3).

FIG. 5 is a perspective view showing the configuration of the extraction tube 76, and FIG. 6 is a plan view showing the cross section of the extraction tube and the configuration of the detecting member. The take-out tube 76 has a pig detection member 76B provided inside a T-tube made of synthetic resin such as vinyl. Then, one end of the detection member 76B is connected to a hinge 76.
D fixed to the fixing member 76C, and it was configured to be able to rotate about 90 ° about this fixed end. The detecting member 76B and the fixing member 76C are made of metal such as iron. The outlet tube 76 is connected to the hose 72 and the pressure adjusting tank 73 via a hose connecting portion and a pressure adjusting tank connecting portion so that water and air from the hose 72 flow upward from below.

Normally, the detection member 76B has its own weight and its longitudinal direction is oriented in the horizontal direction. And the detecting member 7
6B does not impede the flow of water and air. Pig 8
When the detection member 76B is pushed into the take-out tube 76 from the hose 72, the detection member 76B is pushed up by the tip of the pig 8, so that
It rotates counterclockwise in FIG. 6A around the fixed end, and passes the pig 8. When the pig 8 passes, the detection member 76B rotates clockwise and returns to the original position. Pi
When the cartridge 8 has passed the position of the detection member 76B, the pump 7
The operation of 7 is stopped, the lid (not shown) of the outlet 76A is opened, and the pig 8 is taken out. It is preferable that the take-out tube 76 is made of a transparent resin so that it can be checked from the outside. Further, in order to prevent the pig 8 from being sucked into the pressure adjusting tank 73, it is preferable to provide a member (a dish plate or the like) for stopping the movement of the pig 8 in the extraction pipe 76. Further, the rotation of the detection member 76B may be detected by various sensors, and a buzzer or the like may be sounded.

When the cleaning using the pig 8 is completed, FIG.
After the drain pipe 90 as shown in FIG. 1 is attached to the non-discharge valve 51 on the extraction side, the water control valve 2 on the insertion side is opened, and the dirt remaining inside the water distribution pipe 1 is washed away. The drainage pipe 90 includes a first drainage pipe 91 that discharges upper water in the water distribution pipe 1 together with air and suspended matter, and a second drainage pipe 92 that discharges lower water in the water distribution pipe 1 together with sand and iron rust. , A semi-circular tubular support member 93. The physical position of the first drain pipe 91 is fixed with respect to the non-discharge valve 51. The second drain pipe 92 is the first drain pipe 91
And can be moved up and down by turning a screw 94 at the upper end. The support member 93 is physically fixed to the first drain pipe 91.

In this figure, the valve 51 is opened, and the drainage pipe 90 is connected to the valve 51. And screw 94
To lower the lower end of the second drain pipe 92 to the drain pipe 1 close to the lower end of the inner wall. Next, the water control valve 2 on the insertion side is opened, and water is poured into the water distribution pipe 1. The water in the upper part in the water distribution pipe 1 is discharged from the first drain pipe 91 together with the air and suspended matter. The water in the lower part of the water distribution pipe 1 is discharged to the outside from the second drain pipe 92 together with sand and iron rust. When the discharged water is no longer dirty, the water control valve 2 and the non-stop valve 51 are closed, and the drain pipe 90 is removed from the non-stop valve 51.

When the diameter of the water distribution pipe 1 is 100 mm or less, the drain pipe 90 may be drained from the outlet 5 (non-discharge valve, fire hydrant, etc.) without attaching such a drain pipe 90. .

According to the procedure described above, the water distribution pipe 1 between the insertion section 4 and the extraction section 5 in FIG. 1 can be cleaned. The space between the insertion portion 4 and the water control valve 2 and the space between the insertion portion 5 and the water control valve 3 are cleaned by the high-pressure cleaning method as described above.

[0034] When cleaning the water pipe 1 of Figure 1, pig 8
It is desirable that the inside of the water pipe 1 move at a predetermined speed (for example, a speed of about 1 m in 3 seconds). Therefore, the moving speed of the pig 8 is detected as follows. A small hole is made in the upper end of the lid 66. Then, through the fishing line wound around the reel for sea fishing holes, pin tip of the fishing line
After fixing to the bag 8, the lid 66 is closed and high-pressure water is supplied into the apparatus main body 61. Pig 8 reaches the inside of the water pipe 1,
When moving in the water distribution pipe 1, the reel rotates and the fishing line extends. By reading the length of the fishing line with a meter attached to the reel, the position of the pig 8 can be determined. The opening degree of the water control valve 2 is adjusted so that this position advances, for example, by about 1 m in three seconds. In this case, it is necessary to provide a mechanism (a pipe and a pump) for sucking water from the side surface of the lid 66 in order to prevent a part of high-pressure water from blowing out from the hole of the lid 66 when the pig 8 is inserted. is there.

In the cleaning method according to the present invention, as shown in FIG. 8, the water control valves 2D, 2H, 2J, 2K, 2N, 2O, 2
Close R and 2V to create a water break section. And water control valve 2
Insert the pig from the lower position near D and control valve 2H
If the pig is taken out from the lower position near the section, the section W2 can be washed. Of course, even if the route between the insertion position and the removal position is a route that is longer and more complicated, cleaning can be performed without any problem. Further, even if water pipes having different diameters are mixed in the section to be washed at once, the washing can be performed without any problem. However,
When setting the washing section, it is desirable to create a flow of water and air from the upstream to the downstream of the water distribution pipe when viewed from the water distribution station.

[0036]

As described in detail above, according to the present invention, the following effects can be obtained. (1) Even if a water distribution pipe branches in a section to be washed at once, washing can be easily performed.

(2) Even if water pipes having different diameters are mixed in the section to be washed at once, the washing can be easily performed.

(3) Since a hole is not formed in the water distribution pipe, less water is wasted.

(4) Since the section to be cleaned at once can be freely set, the time and labor required for cleaning the entire area to be cleaned is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a method for cleaning a water distribution pipe to which the present invention is applied.

FIG. 2 is a diagram showing details of a pig insertion side in FIG. 1;

FIG. 3 is a view showing details of a pig take-out side in FIG. 1;

FIG. 4 is a flowchart showing a procedure for cleaning a water distribution pipe in the embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration example of an extraction pipe in FIG. 3;

6 is a cross-sectional view of the take-out tube of FIG. 5 and a plan view of a pig detecting member.

FIG. 7 is a cross-sectional view illustrating a configuration example of a drain pipe according to the embodiment of the present invention.

FIG. 8 is a diagram illustrating an example of a section that is cleaned at one time according to the present invention.

FIG. 9 is a diagram showing an example of a section that is cleaned at once by a conventional method.

[Explanation of symbols]

1 ... water pipe, 2, 3 ... water control valve, 4 ... pig insertion part, 5 ...
Pig take-out part, 6: Pig insertion side device, 7: Pig take-out side device, 8: Pig , 41, 51: Non-stop valve.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B08B 9/04 F16L 55/24

Claims (6)

(57) [Claims] 1. Inserting a pig into a water pipe from a first location of the water pipe with water cut off, propelling the pig in the water pipe, and taking out the pig from a second location of the water pipe. A method of cleaning a water pipe between the two locations, wherein when the pig is propelled in the water pipe, air is supplied into the water pipe from the first location, and the first Opening the water control valve in the vicinity of the water supply pipe to supply water into the water supply pipe in the cutoff state, and sucking water and air in the water supply pipe from the second location. Cleaning method. 2. The method for cleaning a water distribution pipe according to claim 1, wherein at least one of the first location and the second location is a non-discharge valve previously attached to the water distribution pipe. 3. The method according to claim 1, further comprising controlling the propulsion speed of the pig to a predetermined value. 4. The method for cleaning a water pipe according to claim 1, wherein after removing the pig, the upper and lower residues in the water pipe are discharged. 5. From the first location of the water pipe with water cut off
Insert a pig into the water pipe and place the pig in the water pipe
Propelled in the pipe, and from the second point of the water pipe,
The water pipe between the two locations by removing
The device used in the second location when the An extraction pipe connectable to the second location, and the extraction pipe
Hose connected to the
Suction tank and the water and air connected to this tank
Pump and a pig outlet tube connected to the hose.
A cleaning device for a water distribution pipe, comprising: 6. The method according to claim 6, further comprising the step of discharging overflowing water.
6. The apparatus for cleaning a water distribution pipe according to claim 5, further comprising: