JPH08108159A - Method for cleaning pipe - Google Patents

Abstract

PURPOSE: To provide a method for cleaning a pipe which is applicable to a pipe with a branch pipe, is free from clogging due to stripped deposit, and can control breakage even in the presence of a deteriorated part in the pipe. CONSTITUTION: After a pipeline W is formed by connecting a negative pressure source to one end side of a pipe 1, the negative pressure source is operated to generate an air current in the pipeline W to remove deposit on the inner surface of the pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a pipe body for removing deposits attached to various pipe inner surfaces such as gas pipes and water pipes buried in the ground.

[0002]

2. Description of the Related Art As is well known, various pipes such as water pipes, gas pipes, etc., adhere to the inner surface of the pipes (for example, in the case of water pipes, water stains if they are used for a long period of time). , Rust, etc.) will not only adversely affect the delivered materials such as water and gas to be delivered, but also become a resistance to the flow of the delivered materials, and the feed materials will be clogged, and high pressure will be applied to pumps, etc. There are many problems such as load, and periodical removal is desired.

Conventionally, as a method for removing the deposits attached to the inner surface of the pipe, for example, in the case of a pipe buried in the ground, the following cleaning method has been adopted.

A. As shown in FIG. 7, a temporary pipe body 20 is installed on the surface of the ground in advance, and the ground G is excavated and the ground G is excavated.
An existing pipe body (not shown) buried inside is dug out for a predetermined length, and the dug portion is cut to create a new pipe body 21.
Repeat the process of replacing with and laying again. B. As shown in FIG. 8, the ground G in which the existing pipe body 22 is buried is excavated at a predetermined length, and after exposing a part thereof, a part of the exposed portion of the existing pipe body 22 is cut. . Then, the brush 24 is placed in the tubular body 23 whose both ends are open.
The wire 25 attached with is inserted, and the brush 24 rubs the inner surface of the tube body 23 to remove the attached matter.

However, the above-mentioned conventional method has the following problems. That is, in the method (a), since the buried existing pipe body is replaced with a new pipe body 21 every predetermined length, the construction period is long and it is necessary to separately install the temporary pipe body 20. Was getting higher.
Moreover, since the ground G in which the pipe body 20 is buried is excavated over the entire area, a large amount of excavated soil is generated during the construction,
The cost of management and disposal was high, and the construction cost was inevitably higher.Besides, traffic regulation had to be carried out due to the construction, and noise and vibrations were generated, which made local residents uncomfortable. It was.

On the other hand, in the method of (b), although the buried tube is not replaced unlike the method of (a), since the interval for removing cannot be long, the construction period is long and the temporary tube cannot be replaced. It had to be installed separately, and the construction cost was high.

In view of such a problem, in recent years, as shown in FIG. 8, the ground G in which the existing pipe body 26 is buried is excavated at a predetermined length and a part of the ground G is exposed to expose one part of the exposed portion. The part is cut, and one end of the pipe body 26 whose both ends are opened is connected to the compressor 28 by the hose 27, and the pipe body 30 having the electrostatic precipitator 29 interposed is connected to the other end, and the compressor 28 is connected to about 7 kg / cm 2. A method of blowing the compressed air of No. ² to remove the adhered matter adhering to the inner surface of the tube body 26 is adopted.

[0008]

However, even in the above method, there are further problems as described below. I. When the pipe body to be removed has the branch pipe 31 ... (See FIG. 9), the compressed air does not flow into the branch pipe, so that the deposits on the inner surface cannot be removed. B. Because high compressed air is sent by the compressor, turbulent flow is likely to occur in the pipe, the separated deposits do not flow smoothly, and the attached deposits are caught.
There was a case where the flow of compressed air was bad and hindered removal. C. Since high pressure is applied to the pipe body, if the pipe body has a deteriorated portion or the like, breakage often occurs.

The present invention has been made in view of the above problems, and can be applied to the case where there is a branch pipe, and when there is no clogging due to peeled deposits and there is a deteriorated portion in the pipe body. It is also an object of the present invention to provide a method for cleaning a pipe body capable of suppressing the damage.

[0010]

According to a first aspect of the present invention, there is provided a method of cleaning a pipe body, wherein one end side of the pipe body is connected to a negative pressure source to form a pipe line, and then the negative pressure source is operated. It is characterized in that an air flow is generated in the pipe.

A method for cleaning a pipe body according to a second aspect of the present invention relates to the method for cleaning a pipe body according to the first aspect, in which the air flow is generated in the pipe line in the pipe line. The feature is that an abrasive is introduced.

A method for cleaning a pipe body according to a third aspect of the present invention relates to the method for cleaning the pipe body according to the first or second aspect, wherein a compressed air source is connected to the other end of the pipe body. It is characterized in that a compressed air source is added to the negative pressure source and operated to generate an air flow in the conduit.

[0013]

In the invention of claim 1, an air flow is generated in the pipe by operating the negative pressure source, and the air flow is sucked toward the negative pressure source side, whereby the adhered matter adhered to the inner surface of the pipe. Are reliably removed.

According to the second aspect of the present invention, in addition to the above-mentioned function, when the abrasive introduced into the pipe is sucked toward the negative pressure source side together with the airflow generated in the pipe, the inner surface of the pipe is reduced. The inner surface of the tube is polished by contact with the adhered material, and the adhered material firmly adhered to the inner surface of the tube is reliably removed.

According to the third aspect of the present invention, in addition to the above operation, a compressed air source is added to the negative pressure source to operate, whereby a larger air flow is generated in the pipeline, and this air flow causes the negative pressure source. By being sucked to the side, the adhering matter that has adhered to the inner surface of the tube is further reliably removed.

[0016]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 and 2 show a situation in which the tube body cleaning method according to the present invention is applied to cleaning a tube body buried in the ground under a paved road. In the figure, reference numeral 1 is a pipe body, 1a is one section path for cleaning the pipe body 1, 2 ... Branch pipes branched from the pipe body 1, C is a suction wheel equipped with a vacuum pump (negative pressure source), R indicates a paved road, G indicates the ground, and W indicates a pipeline.

As shown in FIGS. 1 and 2, excavation shafts 3 and 4 are excavated at a predetermined interval in the ground G in which the pipe body 1 is buried, and the excavation shafts 3 and 4 of the pipe body 1 are excavated. The withdrawal pipes 5 and 6 provided with the branch pipes 5a and 6a bent upward are respectively connected to the portions exposed inside. Flexible hoses 7 and 8 are connected to the branch pipes 5a and 6a, and one hose 7 is a suction wheel C stopped on the ground.
Connected to a vacuum pump (not shown) of the other hose 8
The other end of is open. Here, the pipe body 1, the withdrawal pipes 5 and 6, and the hoses 7 and 8 form a pipe line W.
Then, in this state, the vacuum pump of the suction wheel C is operated to generate an air flow in the conduit W, so that deposits (not shown) attached to the inner surface of the section passage 1a of the pipe 1 can be removed. It has become.

Next, the process of removing the deposits adhering to the inner surface of the pipe body 1 by the pipe body cleaning method according to this embodiment will be described (see FIGS. 1 and 2). In addition,
As a matter of course, this cleaning method is performed in a state in which the supply of gas or the like fed into the pipe body 1 to the pipe body 1 is stopped. First, the excavation pits 3 and 4 are formed by excavating the ground G in which the pipe body 1 is embedded at a predetermined distance and excavating to a predetermined depth so that a part of the pipe body 1 is exposed. Then, the exposed portion of the tubular body 1 is cut by a predetermined length, and the tubular body 1 having both ends opened is cleaned in a section 1
a. Then, the extraction pipes 5 and 6 are connected to both ends of the section path 1a with the branch pipes 5a and 6a facing upward.

Next, flexible hoses 7 and 8 are attached to the branch pipes 5a and 6a of the draw-out pipes 5 and 6, respectively, and the vacuum pump of the suction wheel C in which one hose 7 is on standby on the road side of the paved road R The other hose 8 has its end opened and forms a conduit W. Then, the vacuum pump of the suction wheel C is operated to generate an air flow in the conduit W, and the adhered matter adhering to the inner surface of the section passage 1a is removed by suction.

After removing the deposits, either one of the pull-out pipes 5 and 6 on the side for further removing work is left as it is, and the other is replaced with a linear single pipe (not shown). The excavation pit on the side of is refilled to complete the cleaning of the section road 1a. The tube 1 is cleaned by repeating the above steps.

In the method of cleaning the pipe body 1 of the above embodiment, the air flow is generated in the pipe W by operating the vacuum pump of the suction wheel 1. Then, the air flow is sucked to the suction wheel 1 side, so that the adhered matter attached to the inner surface of the tubular body 1 is surely removed.

As described above, according to the method for cleaning the pipe body 1 of the above-described embodiment, after connecting the one end side of the pipe body 1 to the vacuum pump of the suction wheel C, the vacuum pump is operated to move the inside of the pipe W. Since the air current is generated in and the air flow is sucked toward the suction wheel C to remove the adhering matter adhering to the inner surface of the pipe body 1, the suction force also acts on the inner surfaces of the branch pipes 2 ...
The deposit can be removed over the entire area. Also,
Since the air flow is generated in the pipe W by the vacuum pump, turbulent flow is less likely to occur than in the conventional case, and therefore clogging due to the separated adhered substances can be suppressed. Moreover, since the inside of the pipe W does not have a high pressure, even if the pipe has a deteriorated portion, the damage can be suppressed.

In the above embodiment, the present invention is applied to the pipe body 1 buried in the ground G, but the present invention is not limited to this application and, for example, is fixed and piped in a building. Needless to say, it can be applied to various pipes such as water pipes and gas pipes.

Further, in the above-described embodiment, the withdrawal pipes 5 and 6 having the branch pipes 5a and 6a are attached to both ends of the section passage 1a, but as shown in FIG. May be stopped by the valve 9 and the end water stop plate 10, and a draw-out pipe 11 bent upward may be attached to the end of the section passage 1a.

Furthermore, when the deposits adhering to the inside of the tubular body 1 cannot be removed by the above method, or from the beginning, as shown in FIG.
As shown in, an abrasive material introducing device T may be attached to the open end side of the tube body 1 opposite to the vacuum pump, instead of the hose 8. This abrasive material introducing device T is provided with an abrasive material filling hopper 15 through a full bower valve 14 in the vicinity of an open end portion of a pipe body 13 having a U-shaped pipe passage 12 in a side view at an intermediate portion in the vertical direction. In the state where the air flow is generated in the section passage 1a by the suction wheel C, the full-bore valve 14 is opened to move the abrasive material 16 in the hopper 15 into the section passage 1a together with the air flow. And the abrasive material 16 is brought into contact with the adhered matter on the inner surface of the section passage 1a, the inner surface of the tubular body 1 is polished and the adhered matter such as rust firmly adhered can be reliably removed.

Further, the adhered substance and the abrasive 16 which have been peeled off ...
It is also possible to provide a separating means for separating and accommodating such substances from the air between the vacuum pump and the tube 1. further,
As shown in FIG. 5, instead of the suction wheel C, a mounting tank vehicle D having a tank for separating and containing the separated adhered substances is connected, and a suction wheel E having a vacuum pump mounted on the tank of the mounting tank vehicle D. , F may be connected to each other. In this case, the suction force can be further increased by connecting the hose 7 to the tank of the tank car D and operating the vacuum pumps of the suction cars E and F simultaneously.
The length of the section road for cleaning can be increased. Therefore, the excavation interval of the ground can be lengthened, and the construction period can be greatly shortened.

In addition, as shown by a chain double-dashed line in FIG. 1 or as shown in FIG.
A compressed air source 17 such as a compressor is connected to the open end of the, and the compressed air source 17 is operated in addition to the vacuum pump of the suction wheel C so that the compressed air source 17 is sucked into the conduit W from the compressed air source 17 side. It is also possible to generate an air flow on the side of the vacuum pump of the car C. As a result, a larger air flow is generated in the pipe W, and this air flow is sucked to the vacuum pump side of the suction wheel C, so that the adhered matter that has adhered to the inner surface of the pipe body 1 can be more reliably retained. It can be removed and the abrasive 16 ...
If introduced, the effect of the abrasive 16 can be further enhanced. Of course, if this method is adopted, the length of the section road for cleaning can be lengthened and the ground excavation interval can be lengthened, so that the construction period can be greatly shortened. In this case, the compressed air source 17 only plays a role of assisting the suction by the vacuum pump, and therefore, the air is discharged at a flow rate smaller than the suction flow rate by the vacuum pump (for example, about 1/3). become.

[0028]

EFFECTS OF THE INVENTION The tube body cleaning method according to the present invention has the following effects. According to the pipe body cleaning method of claim 1, one end side of the pipe body is connected to a negative pressure source to form a pipe line, and then the negative pressure source is operated to generate an air flow in the pipe line. Since the squeezing is performed, the suction force works over the entire area of the tubular body, and the deposit on the inner surface can be reliably removed. Moreover, since the air flow is generated by the negative pressure source, turbulent flow is less likely to occur than in the conventional case, and clogging due to the separated adhered substances can be suppressed. Moreover, even if there is a deteriorated portion in the pipe body, the damage can be suppressed.

According to the method of cleaning the pipe body of the second aspect, the abrasive is sucked together with the air flow to polish the inner surface of the pipe body. Kimono can also be reliably removed.

According to the third aspect of the present invention, the compressed air source is added to the negative pressure source to operate, so that a larger air flow is generated in the pipeline, and this air flow is directed to the negative pressure source side. By being sucked, it is possible to more reliably remove the adhering matter that has adhered to the inner surface of the tube, and if an abrasive is used, the effect of the abrasive can be further enhanced.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a situation in which a tube body buried in the ground is being cleaned by applying a tube body cleaning method according to the present invention.

FIG. 2 is a schematic plan view showing the same situation.

FIG. 3 is a plan view showing another example of the connecting portion of the pipe body in the excavation mine.

FIG. 4 is a schematic plan view showing the arrangement of suction wheels when the suction force is increased.

FIG. 5 is a schematic side view showing a state in which an abrasive material introducing device is attached to the open end side of the tubular body.

FIG. 6 is a schematic side view showing another example of a state in which an abrasive material introducing device is attached to the open end side of the tubular body.

FIG. 7 is a schematic diagram showing a conventional cleaning method by replacing and replacing a pipe body.

FIG. 8 is a schematic view showing a conventional cleaning method using a wire brush.

FIG. 9 is a schematic diagram showing a conventional cleaning method using compressed air.

[Explanation of symbols]

 1 Pipe W Pipe 16 Abrasive 17 Compressed air source

Claims (3)

[Claims] 1. A pipe body, characterized in that one end side of the pipe body is connected to a negative pressure source to form a pipe line, and then the negative pressure source is operated to generate an air flow in the pipe line. Cleaning method. 2. The pipe cleaning method according to claim 1, wherein an abrasive is introduced into the pipe line in a state where an airflow is generated in the pipe line. How to clean your body. 3. The method of cleaning a pipe body according to claim 1, wherein a compressed air source is connected to the other end side of the pipe body, and the compressed air source is added to the negative pressure source to operate. A method for cleaning a pipe body, characterized in that an air flow is generated in the pipe line.