JPH08246545A - Method of cleaning inside of duct - Google Patents

Abstract

PURPOSE: To clean the inside of a duct by efficiently removing sediment or sludge while letting water flow into a duct. CONSTITUTION: Expansive and elastic air balls 4, 5, and 6 connected to compressors (compressed air supply sources) 9, 10, and 11, respectively, are coupled with one another, and these air balls 4, 5, and 6 are introduced into the duct 1, and the air ball 4 positioned at the uppermost stream is expanded to block the inside of the duct 1, and also other air balls 5 and 6 are expanded to such a level that specified space (passages) is made between the the inwall of the duct 1 and themselves. When water gathers upstream of the air ball 4 positioned at the uppermost stream, a specified quantity of compressed air is let out of the air ball 4, and the gathered water is let flow to the space (passages) between the downstream air balls 5 and 6 and the inwall of the duct 1. Sediment or sludge collected at the bottom within the duct 1 is removed, making positive use of the water flowing in the duct 1, and the inside of the duct 1 can be cleaned.

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 an inside of a pipeline which can clean the inside of the pipeline while flowing water.

[0002]

2. Description of the Related Art Sediment and sludge collect at the bottom of pipelines such as sewer pipes, which obstruct the smooth flow of sewage. Need to be removed regularly.

Therefore, conventionally, a method has been adopted in which water is dammed upstream of the portion to be cleaned of the pipeline and the settling and sludge accumulated in the portion to be cleaned are removed using a bucket or the like.

[0004]

However, when water is dammed as in the conventional case, the dammed water is pumped up by a pump or the like, and this is bypassed to the portion to be cleaned of the pipeline to the downstream side thereof. It was necessary to flush it, and the equipment and work for it were difficult, and the work of removing sand and sludge using a bucket was inefficient.

The present invention has been made in view of the above problems, and a purpose of the present invention is to provide a pipeline capable of efficiently removing sand and sludge while flowing water into the pipeline to clean the interior of the pipeline. It is to provide an internal cleaning method.

[0006]

In order to achieve the above object, the invention according to claim 1 connects at least two inflatable and deflatable air balls each connected to a compressed air supply source, and these air balls are connected to each other. A ball is introduced into the pipeline to expand the air ball located at the uppermost stream to close the inside of the pipeline with the air ball, and a predetermined gap is formed between the other air ball and the inner wall of the pipeline. When a predetermined amount of water is collected upstream of the air ball located at the uppermost stream, a predetermined amount of compressed air is extracted from the air ball, and the collected water is collected to the downstream air ball and the inner wall of the pipe line. It is characterized by flowing into the gap.

According to a second aspect of the present invention, in the first aspect of the invention, water is accumulated in the pipe line by the air ball located at the most upstream side, and when a predetermined amount of water is accumulated, this water is fed to the downstream side air. It is characterized in that the work of flowing into the gap between the ball and the inner wall of the pipeline is repeated a plurality of times while moving the air ball along the pipeline.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a weir is provided on the downstream side of the air ball in the pipe line to stop settling sand, sludge and the like that flow downstream with water. It is characterized in that the settling sand, sludge and the like are pumped up to the ground by a pump.

According to a fourth aspect of the present invention, in the third aspect of the invention, the settling sand and sludge pumped to the ground by a pump is dehydrated using a dehydration sheet.

[0010]

According to the first aspect of the present invention, the air ball located in the uppermost stream functions as a kind of valve, has a function of blocking the pipe line to collect water upstream, and a predetermined amount of water. An air ball that functions to flow water to the downstream side, and an air ball located on the downstream side of the air ball vigorously flows the accumulated water to the downstream side and causes sediment or sludge accumulated at the bottom of the pipeline to flow to the downstream side. Perform a function. As described above, in the method of the present invention, since the water flowing in the pipeline is positively utilized, it is not necessary to block the water and pump up the blocked water to bypass it as in the conventional method. It is possible to clean the inside of the pipeline with good workability and with a minimum of equipment while allowing the water to flow as it is.

According to the second aspect of the present invention, if the work described in the first aspect is repeated a plurality of times while moving the air ball along the pipeline, required cleaning can be easily performed even for a long pipeline. Can be done.

According to the third aspect of the present invention, the settling sand and the sludge which are made to flow downstream together with water by the method of the first or second aspect are dammed up by the weir installed on the downstream side and stay there. Therefore, these sediments and sludge are pumped to the ground by a pump and completely removed from the pipeline. Therefore, the inside of the conduit can be cleaned more reliably and efficiently as compared with the conventional method using a bucket or the like.

According to the invention as set forth in claim 4, since the sediment and sludge pumped up to the ground by the pump are dehydrated on the spot, the handling is facilitated and the water separated by the dehydration is directly piped. It can be returned to the downstream side of the weir in the passage and flowed.

[0014]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 5 are sectional views showing the method of cleaning a pipe according to the present invention in the order of steps thereof.

In the figure, reference numeral 1 denotes a pipeline such as a sewer pipe buried in the ground, and a manhole 2 opening to the atmosphere is opened at an appropriate interval in the pipeline 1. Sediment and sludge are accumulated at the bottom of 1.

Thus, in the method of the present invention, as shown in FIG. 1, three inflatable and retractable air balls 4, 5 and 6 connected to each other by a rope 3 are in a contracted state from the manhole 2 to the conduit 1. Will be introduced in. Water flows in the pipeline 1 in the direction of the arrow in FIG.
Tow ropes 7 and 8 are attached to the respective ends of the air balls 6 and the air balls 6, and the air balls 4, 5 and 6 are connected to the conduit 1 by operating these tow ropes 7 and 8, respectively.
When introduced into the inside, these air balls 4, 5, 6 are made to flow by water and arranged in a line in this order from the upstream side as shown in the drawing.

By the way, three compressors 9, 10, 11 are installed on the ground, and the air balls 4, 5, 6 are provided in each of the compressors 9, 10, 11 with the air hoses 12, 13, 14 and valves. 15, 16, 17
Are individually connected via. In the middle of each air hose 12, 13, 14, pressure gauges 18, 19,
20 are attached respectively.

Next, from the state shown in FIG. 1, the compressors 9, 10, 11 are driven to supply compressed air to the air hose 1.
The air balls 4, 5 and 6 are supplied to the air balls 4 through 5, 13 and 14, respectively, and as shown in FIG.
The compressed air of (1) is supplied to expand the compressed air, and the inside of the duct 1 is closed by the air balls 4. Further, other air balls 5, which are located on the downstream side of the air ball 4,
Compressed air of about 70% and 60%, for example, is supplied to each of 6 to expand them. At this time, the air balls 5 and 6 are not expanded to airtightly close the inside of the conduit 1, and when water flows from these upstream, they float on the water and the inner wall of the conduit 1 is closed. A predetermined gap (flow path) is formed between the and.

When the air ball 4 located at the uppermost stream closes the inside of the pipe line 1 as described above, the pipe line 1 is closed.
Water gradually accumulates on the upstream side of the air ball 4 inside, and as shown in FIG. 3, when a predetermined amount of water accumulates on the upstream side of the air ball 4, the valve 15 is opened and the inside of the air ball 4 is closed. When a predetermined amount (for example, about 1/2) of compressed air is extracted, the air ball 4 contracts to some extent and floats on the water as shown in FIG. 4, so that the air ball 4 and the inner wall of the conduit 1 are separated from each other. Since a predetermined gap (flow passage) is formed between them, the accumulated water flows vigorously to the downstream side through this gap (flow passage).

By the way, as described above, the air ball 4
Since the air balls 5 and 6 located on the downstream side do not expand to airtightly close the inside of the conduit 1, a gap (flow passage) formed between the air ball 4 and the inner wall of the conduit 1 is formed. When the water that has passed through flows from the upstream, these air balls 5 and 6 float on the water as shown in FIG.
A predetermined gap (flow path) is formed between the inner wall and the inner wall. Therefore, the water vigorously flows through the gaps (flow paths) between the air balls 5 and 6 and the inner wall of the pipe line 1, and pushes the sediment and sludge accumulated at the bottom of the pipe line 1 to the downstream side.

When the pipeline 1 is long, the tow rope 8 is pulled to move the air balls 4, 5 and 6 along the pipeline 1 toward the downstream side by a predetermined distance, and the compressor 9 is again used.
Is driven to inflate the air ball 4 to close the inside of the conduit 1 (see FIG. 2), and when a predetermined amount of water is accumulated upstream of the air ball 4 (see FIG. 3), a predetermined amount of water is discharged from the air ball 4. The compressed air is removed and the accumulated water is caused to flow downstream (see FIG. 4), and a series of operations is repeated a plurality of times.

By the way, as shown in FIG. 5, a weir 21 is provided in a portion near the manhole 2 on the downstream side in the pipe line 1, and the settling sand flowed to the downstream side together with water by the series of operations described above. The sludge is blocked by the weir 21 and accumulates there. Then, the accumulated sand and sludge are pumped up to the ground by the hydraulic sand pump 22 and removed from the pipeline 1.

Here, a hydraulic drive device 23 and a dehydrator 24 are installed on the ground, and the sand pump 22 installed in the pipeline 1 is connected to the hydraulic drive device 23 via a hydraulic hose 25. At the same time, a discharge hose 26 extending from the sand pump 22 is extended to the ground and opens above the dehydrator 24.

The dehydrating device 24 is constructed by stretching a dehydrating sheet 28 made of a non-woven fabric permeable only to water on the inside of the side wall of a frame 27 having a plurality of water drain holes formed in the side wall. Is installed in the container 29. A water hose 30 is led out from the container 29, and the water hose 30 is open to the downstream side of the weir 21 in the pipeline 1.

When the sand pump 22 is driven by the hydraulic drive device 23, the sand settled and sludge accumulated upstream of the weir 21 in the pipeline 1 is sucked together with water by the sand pump 22 and dehydrated from the discharge hose 26. It is sent to the device 24 and dehydrated. That is, in the dewatering device 24, only the water permeates the dewatering sheet 28 and flows out into the container 29, and the water accumulated in the container 29 passes through the water hose 30 and the pipeline 1.
It is returned to the downstream of the weir 21 and flowed in the pipeline 1. On the other hand, the dehydrated sand and sludge are transported to another place and used for land reclamation.

In the above pipe cleaning method, the most upstream air ball 4 functions as a kind of valve,
The air ball 5, which is located on the downstream side of the air ball 4, has a function of closing the pipe 1 to collect water upstream and a function of flowing this water downstream when a predetermined amount of water is collected.
6 functions to force the accumulated water to flow to the downstream side and to flow the sediment and sludge accumulated at the bottom of the pipeline 1 to the downstream side.
As described above, in the present embodiment, since the water flowing in the pipe line 1 is positively used, it is not necessary to block the water and pump up the blocked water to bypass it as in the conventional case. It is possible to efficiently clean the inside of the pipeline 1 with a minimum of equipment while allowing the water to flow into the pipeline 1 as it is with a minimum of equipment.

Further, according to this embodiment, the air balls 4,
By repeating the above-described series of operations a plurality of times while moving the pipes 5 and 6 along the pipeline, required cleaning can be easily performed on the pipeline 1 even if the pipeline 1 is long. it can.

Further, according to the present embodiment, the settling sand and sludge that are made to flow to the downstream side together with water are the weirs 21 installed at the downstream side.
Since these are settled by the dam and stay there, these sands and sludges are pumped to the ground by the sand pump 22 and completely removed from the inside of the pipeline 1. Therefore, compared with the conventional method using a bucket, etc. The cleaning of the inside of the passage 1 can be performed more reliably and efficiently.

Further, according to the present embodiment, the sand pump 22
Since the sediment and sludge pumped up by the ground are dehydrated on the spot, the handling is facilitated and the water separated by dehydration is returned directly to the downstream side of the weir 21 in the pipeline 1. You can

The example of cleaning the inside of the pipeline using three air balls has been described above.
The same operation can be performed by using one or four or more air balls.

[0032]

As is apparent from the above description, according to the present invention, at least two inflatable and defensible air balls each connected to the compressed air supply source are connected to each other, and these air balls are connected to the conduit. Introduced into the inside to inflate the air ball located in the uppermost stream to close the inside of the pipe line with the air ball and expand other air balls to the extent that a predetermined gap is formed between the air ball and the inner wall of the pipe line. Then, when a predetermined amount of water accumulates upstream of the air ball located in the uppermost stream,
Since a predetermined amount of compressed air was extracted from the air ball and the accumulated water was made to flow into the gap between the air ball on the downstream side and the inner wall of the pipeline, the sediment and sludge were efficiently removed while the water was flowing in the pipeline. The effect that the inside of the road can be cleaned is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a method for cleaning a pipe according to the present invention in the order of steps thereof.

FIG. 2 is a cross-sectional view showing a method for cleaning a pipe according to the present invention in the order of steps thereof.

FIG. 3 is a cross-sectional view showing a method for cleaning an inside of a pipe according to the present invention in the order of steps thereof.

FIG. 4 is a cross-sectional view showing a method for cleaning a pipe according to the present invention in the order of steps thereof.

5A to 5D are cross-sectional views showing a method for cleaning a pipe according to the present invention in the order of steps thereof.

[Explanation of symbols]

 1 Pipeline 4-6 Air Ball 9-11 Compressor (Compressed Air Supply Source) 21 Weir 22 Sand Pump 24 Dehydrator 28 Dehydration Sheet

Claims (4)

[Claims] 1. At least two expandable and contractible air balls each connected to a compressed air supply source are connected to each other, and these air balls are introduced into a conduit to expand the uppermost air ball. The air ball closes the inside of the pipeline with the air ball and expands other air balls to the extent that a predetermined gap is formed between the inner wall of the pipeline and a predetermined amount upstream of the air ball located at the most upstream. When a certain amount of compressed water is collected from the air ball,
A method for cleaning an inside of a pipe, which comprises flowing the accumulated water into a gap between an air ball on the downstream side and an inner wall of the pipe. 2. An air ball is used to collect water in the pipe line by the air ball located at the most upstream side, and when a predetermined amount of water is collected, the water is caused to flow into the gap between the air ball on the downstream side and the inner wall of the pipe line. The method for cleaning an inside of a pipeline according to claim 1, wherein the cleaning is repeated a plurality of times while moving along the pipeline. 3. A weir is provided on the downstream side of the air ball in the pipe line to stop settling sand, sludge, etc. flowing downstream along with water, and pumping the settling sand, sludge, etc. to the ground. The method for cleaning an inside of a pipeline according to claim 1 or 2. 4. The method for cleaning the inside of a pipeline according to claim 3, wherein the settling sand and sludge pumped to the ground by a pump are dehydrated by using a dehydration sheet.