JPH1018406A - Dredging method for earth and sand built up in pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clean the inside of a pipeline by dredging even earth and sand built up in a large-sized or zigzag pipeline definitely and efficiently. SOLUTION: A high air-tight tubular envelop 5, which is connected to a compressor 7 (a compressed air supply source), is inserted into a pipeline 1. Then, a compressed air is supplied to the tubular envelope 5, thereby expanding the tubular envelop 5. The inside of the pipeline 1 is blocked with the expanded envelop 5 so that water may be accumulated in the upstream area of the tubular envelop 5. When a specified amount of water is accumulated, the compressed air is vented gradually from the tubular envelop 5 so that the accumulated water may flow in a clearance between the tubular envelop 5 and the pipeline 1, thereby carrying downstream the water with earth and sand 3 built up the bottom of the pipeline 1. The earth and sand 3 is dammed up with a sandbag (weir) 13 provided on the downstream side and pumped up to the ground together with the water by means of a sand pump 12. Since the tubular envelop is insertible easily into a large-sized or zigzag pipeline due to this construction and functions as one type of a valve, it is possible to carry downstream even the earth and sand 3 built up in the pipeline and dredge the earth and sand 3 definitely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for dredging earth and sand deposited in a pipeline.

[0002]

2. Description of the Related Art Sediment accumulates at the bottom of pipes such as sewer pipes and impedes the smooth flow of sewage and the like. Therefore, it is necessary to periodically clean the inside of pipes and dredge the sediment collected at the bottom. is there.

[0003] As a method of dredging the sediment accumulated at the bottom in a pipeline, a method of drawing the sediment to a downstream pipe opening with high-pressure jet water which is jetted backward has been well known.

[0004]

However, when the diameter of the pipeline is increased, the amount of sediment deposited and the amount of inflow water increase, and according to the conventional dredging method, the outlet of the high-pressure jet water is submerged and cavitation occurs. For this reason, there was a problem that the power to blow off the earth and sand was lost and the earth and sand could not be drawn to the downstream.

In addition, sediment easily accumulates in pipelines in which water is generated due to meandering, and dredging is particularly required. It was not possible to completely remove the sediment deposited on the river with high-pressure jet water.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a purpose thereof is to surely and efficiently dredge even large-diameter or sediment accumulated in a meandering pipe to clean the inside of the pipe. It is an object of the present invention to provide a dredging method for sediment deposited in a pipeline.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, after a highly airtight tubular bag connected to a compressed air supply source is inserted into a pipe, the tubular bag is inserted into the tubular bag. The compressed air is supplied to the bag to expand it, the water flowing in the pipeline flows through the gap between the tubular bag and the inner wall of the pipeline, and the sediment deposited at the bottom of the pipeline is carried downstream together with the water, It is characterized by blocking earth and sand by a weir provided on the downstream side and pumping it to the ground with a pump together with water.

According to a second aspect of the present invention, in the first aspect of the present invention, the tubular bag is inverted and inserted into the pipeline by compressed air pressure.

According to a third aspect of the present invention, in accordance with the first aspect of the present invention, a tubular bag shorter than a pipe length is used, the tubular bag is inflated, and water is introduced into a gap between the tubular bag and an inner wall of the pipe. Is carried out a plurality of times while moving the tubular bag along the pipeline by transporting the sediment deposited on the bottom of the pipeline together with water to the downstream.

According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, the inside of the pipeline is closed by the tubular bag expanded in the pipeline, and water is supplied upstream of the tubular bag. When a predetermined amount of water accumulates, compressed air is gradually removed from the tubular bag to form a gap between the tubular bag and the inner wall of the conduit, and the accumulated water is caused to flow through the gap. And

[0011] The invention according to claim 4 is the invention according to claims 1, 2, 3
Or the invention described in 4, wherein the earth and sand pumped to the ground by the pump is introduced into a dehydration bag to perform dehydration treatment, and water separated by the dehydration treatment is caused to flow downstream of the tubular bag body in a pipeline. .

Therefore, according to the first aspect of the present invention, the water flowing in the pipeline is squeezed by flowing through the gap between the tubular bag and the inner wall of the pipeline to increase the flow velocity. The sediment deposited on the water is washed down by water and pumped up to the ground by a pump.However, since the tubular bag is easily inserted into a large-diameter or meandering pipe, it is inserted into a large-diameter or meandering pipe. The accumulated sediment can also be transported downstream and reliably dredged.

According to the second aspect of the present invention, the tubular bag can be easily inverted and inserted even in a large-diameter or meandering pipeline.

According to the third aspect of the present invention, a required dredging operation can be easily performed even for a particularly long pipeline.

According to the fourth aspect of the present invention, the tubular bag functions as a kind of valve, closes the pipeline and stores water upstream thereof, and when a predetermined amount of water is stored, the water is transferred downstream. In order to perform the function of flowing quickly, sediment accumulated at the bottom of the pipe is reliably washed away by the fast flowing water.

According to the fifth aspect of the present invention, since the earth and sand pumped to the ground by the pump is dehydrated on the spot, the handling thereof is facilitated, and the earth and sand which has been dewatered and accommodated in the dewatering bag. Can be transported to a predetermined place as it is, and the water separated by the dehydration treatment can be returned to the pipeline as it is.

[0017]

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

<Embodiment 1> FIGS. 1 to 3 are sectional views showing a dredging method according to the present invention in the order of steps.

In FIG. 1, reference numeral 1 denotes a pipeline such as a sewer pipe buried underground. The pipeline 1 has a plurality of manholes 2 opening to the atmosphere at appropriate intervals. Sediment 3 is deposited on the bottom of the portion 1A of the pipe to be cleaned.

In the method of the present invention, as shown in FIG. 1, one end of a highly airtight tubular bag 5 is attached to the outer periphery of the lower part of the reversing nozzle 4 installed on the ground by being turned outward. A closed space S closed by the reversing nozzle 4 is formed in the tubular bag 5. A compressor 7 is connected to the reversing nozzle 4 via an air hose 6.
Are connected, and a pressure gauge 8 and an exhaust hose 9 are connected. Valves 10 and 11 are provided in the air hose 6 and the exhaust hose 9, respectively. The tubular bag 5 is formed by covering an outer surface or an inner surface of a tubular woven or non-woven fabric of polyester, acrylic or the like with a highly airtight plastic film such as polyurethane or polyethylene.

On the other hand, a sand pump 12 is installed on the downstream side of the portion 1A to be cleaned of the pipeline 1, and this sand pump 12
A plurality of sandbags 13 are stacked downstream to form a weir. The suction hose 14 connected to the sand pump 12 extends to the ground through the manhole 2 on the downstream side, and opens above a dehydration bag 16 accommodated in a container 15 installed on the ground. The dewatering bag 16 is made of a woven or non-woven fabric such as polyester, acrylic, or polypropylene that allows only water to pass through. One end of the bag is folded outward and attached to the outer periphery of the upper portion of the tubular frame 17, and the other end is connected to Being lifted by.

A drain hose 19 led out from the lower part of the container 15 passes through the manhole 2 on the downstream side and opens to the downstream side of the sandbag 13 in the pipeline 1.

When the compressor 7 is driven with one valve 10 opened and the other valve 11 closed, the compressed air flows through the air hose 6 into the tubular bag 5.
Because it is supplied to the enclosed space S inside, as shown in FIG.
The tubular bag 5 is sequentially inserted downstream through the manhole 2 on the upstream side (the left side in FIG. 1) into the portion 1A to be cleaned of the pipe 1 while being inverted by the pressure of the compressed air.

As shown in FIG. 2, when the tubular bag 5 is inverted and inserted over the entire length of the portion 1A to be cleaned of the pipeline 1, a predetermined internal pressure is applied to the closed space S so that the tubular bag 5 Is inflated and pressed against the portion 1A to be cleaned of the pipeline 1, the portion 1A to be cleaned is closed by the tubular bag 5.

When the portion 1A to be cleaned of the pipeline 1 is closed by the tubular bag 5 as described above, water gradually accumulates on the upstream side of the tubular bag 5 of the pipeline 1. As shown in FIG. 2, when a predetermined amount of water accumulates upstream of the tubular bag 5 in the pipeline 1, the valve 11 is opened and the compressed air in the tubular bag 5 is discharged from the exhaust hose 9 by a predetermined amount. Gradually pull out,
As shown in FIG. 3, the tubular bag 5 contracts somewhat and floats on the water, and a predetermined gap is formed between the tubular bag 5 and the bottom wall (earth and sand 3) of the portion 1A to be cleaned of the pipeline 1. Since the (flow path) is formed, the accumulated water flows vigorously to the downstream side through the gap (flow path), and the sediment 3 deposited on the bottom of the portion 1A to be cleaned of the pipe 1 is moved to the downstream side. To flush.

Then, the earth and sand 3 washed down to the downstream side is blocked by the sandbag 13 and accumulates there. At this time, the sand pump 12 is driven, and the accumulated earth and sand 3 is sucked by the sand pump 12 together with the water, pumped up to the ground via a suction hose 14, sent to a dewatering bag 16 installed on the ground, and subjected to dehydration processing. You. That is, in the dewatering bag 16, only the water permeates and flows out into the container 15, and the water collected in the container 15 is returned to the downstream of the sandbag 13 of the pipe 1 through the drainage hose 19 and is transferred to the pipe 1. It is shed again. On the other hand, the dewatered earth and sand 3 is transported together with the dewatering bag 16 to, for example, another place and used for land reclamation and the like.

As a result, the sediment 3 deposited on the bottom of the portion 1A to be cleaned of the pipe line 1 is dredged to clean the portion 1A to be cleaned, so that sewage and the like smoothly pass through the portion 1A to be cleaned without resistance. Flows to In addition, the cleaning of the further downstream side of the pipe line 1 can be sequentially performed in the same procedure as described above.

Thus, according to the dredging method according to the present invention described above, the tubular bag 5 functions as a kind of valve,
The tubular bag 5 has a large diameter or a meandering pipe, although it has a function of closing the portion 1A to be cleaned of the pipe 1 and storing water upstream thereof and a function of flowing the water downstream when a predetermined amount of water is stored. Since it is easily inserted into the road to perform the above-described function, the sediment deposited in the large-diameter or meandering pipeline can be transported downstream and reliably dredged. In particular, in the present embodiment, since the tubular bag 5 is reversely inserted into the pipe 1 by the pressure of the compressed air, the tubular bag 5 can be easily inverted even in a large-diameter or meandering pipe. Can be inserted.

<Embodiment 2> Next, an embodiment of the present invention will be described with reference to FIGS. 4 to 7
The drawings are cross-sectional views showing a dredging method according to Embodiment 2 of the present invention in the order of steps. In these drawings, the same elements as those shown in FIGS. 1 to 3 are denoted by the same reference numerals. A description of them will be omitted.

The dredging method according to the present embodiment is particularly effective when the length of the portion 1A to be cleaned of the pipeline 1 is long.
By repeating the same operation as in the first embodiment while using the tubular bag 5 shorter than the length of the portion 1A to be cleaned of the pipe 1 and moving it downstream along the pipe 1, the pipe 1
Is a method of dredging the sediment 3 deposited on the bottom of the portion 1A to be cleaned.

That is, as shown in FIG. 4, the tubular bag body 5 whose both ends are closed by the caps 20 and 21 is operated by operating the tow ropes 22 and 23 so that the uppermost stream of the portion 1A to be cleaned of the pipe line 1 is first operated. Insert into position and secure in place.

Next, the compressor 7 is driven to supply compressed air through the air hose 6 to the closed space S in the tubular bag 5.
As shown in FIG. 4, the tubular bag 5 is inflated and pressed against the portion 1A to be cleaned of the pipeline 1, and the tubular portion 5 closes the portion 1A of the pipeline 1 to be cleaned. Then, water gradually accumulates on the upstream side of the tubular bag 5 of the pipeline 1, and as shown in FIG. 5, when a predetermined amount of water accumulates upstream of the tubular bag 5 of the pipeline 1 When the compressed air in the tubular bag 5 is gradually removed from the exhaust hose 9 by a predetermined amount, the tubular bag 5 is slightly contracted as shown in FIG. Since a predetermined gap (flow path) is formed between the tubular bag body 5 and the bottom wall (earth and sand 3) of the portion 1A to be cleaned of the pipeline 1, accumulated water passes through the gap (flow path). It flows vigorously to the downstream side, and the portion to be cleaned 1A of the pipeline 1
The sediment 3 deposited on the upstream side of the water is flushed to the downstream side.

As described above, the portion 1A to be cleaned of the pipe line 1
When the earth and sand 3 accumulated on the upstream side of the tubular bag 5 are washed down, the valve 11 is opened to open the tubular bag 5 as shown in FIG.
The compressed air is removed from the tube, the tubular bag body 5 is moved to the downstream side in a contracted state, and the same operation as described above (the operation shown in FIGS. 5 and 6) is repeated to clean the portion 1A of the pipe line 1 to be cleaned.
The sediment 3 that has accumulated on the downstream side and the soil 3 that has been washed away from the upstream are further washed down.

Then, all of the earth and sand 3 deposited on the portion 1A to be cleaned of the pipe line 1 is washed away and is blocked by the sandbag 13, and when the earth and sand 3 accumulates in that portion, the sand is removed as in the first embodiment. The pump 12 is driven, and the accumulated earth and sand 3 is sucked by the sand pump 12 together with the water, pumped up to the ground via the suction hose 14, and dehydrated bag 16 installed on the ground.
To be dehydrated.

According to the dredging method according to the present embodiment, the tubular bag 5 is easily inserted into a large-diameter or meandering pipe to perform a predetermined function. Similar to the above, sediment deposited in large-diameter or meandering pipes can be transported downstream and reliably dredged, but especially for pipes with long lengths to be cleaned, sedimentation should be surely dredged. be able to.

[0036]

As is apparent from the above description, according to the present invention, a highly airtight tubular bag connected to a compressed air supply source is inserted into a pipe and then compressed into the tubular bag. Air is supplied to inflate the water, the water in the pipeline flows through the gap between the tubular bag and the inner wall of the pipeline, and the sediment deposited on the bottom of the pipeline together with the water is carried downstream, and is provided on the downstream side. The sediment is stopped by the weir and the water is pumped up to the ground with the water, so that the sediment deposited in the large-diameter or meandering pipe can be reliably and efficiently dredged to clean the pipe. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a dredging method according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing a dredging method according to Embodiment 1 of the present invention.

FIG. 3 is a sectional view showing a dredging method according to Embodiment 1 of the present invention.

FIG. 4 is a sectional view showing a dredging method according to Embodiment 2 of the present invention.

FIG. 5 is a sectional view showing a dredging method according to Embodiment 2 of the present invention.

FIG. 6 is a sectional view showing a dredging method according to Embodiment 2 of the present invention.

FIG. 7 is a sectional view showing a dredging method according to Embodiment 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 3 Earth and sand 5 Tubular bag 7 Compressor (compressed air supply source) 12 Sand pump (pump) 13 Sandbag (weir) 16 Dehydration bag 19 Drain hose

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeru Endo 2-12-4 Hanahata, Tsukuba-shi, Ibaraki Co., Ltd. Get (72) Inventor Hiroyuki Aoki 1-194, Hayashi, Tokorozawa-shi, Saitama In company all

Claims (5)

[Claims] After a highly airtight tubular bag connected to a compressed air supply source is inserted into a pipe, compressed air is supplied to the tubular bag to expand the tubular bag and flow through the pipe. The water flows through the gap between the tubular bag and the inner wall of the pipeline, transports the sediment deposited on the bottom of the pipeline along with the water downstream, dams the sediment with a weir provided on the downstream side, and pumps this with water. A method of dredging sediment in a pipeline, characterized by being pumped to the ground. 2. The method for dredging sediment deposited in a pipeline according to claim 1, wherein the tubular bag body is inverted and inserted into the pipeline by compressed air pressure. 3. A tubular bag having a length shorter than the length of a pipe is used, the tubular bag is inflated, water flows through a gap between the tubular bag and an inner wall of the pipe, and sediment deposited on the bottom of the pipe together with water. The method for dredging sediment deposited in a pipeline according to claim 1, wherein the operation of transporting to the downstream is repeated a plurality of times while moving the tubular bag along the pipeline. 4. A tube is closed by the tubular bag body expanded in the tube, water is stored upstream of the tubular bag, and when a predetermined amount of water is collected, compressed air is gradually released from the tubular bag. 4. A gap is formed between the tubular bag body and the inner wall of the conduit by pulling out, and accumulated water is caused to flow through the gap.
The dredging method for the volume of sediment in the pipeline described above. 5. The method according to claim 1, wherein the sediment pumped to the ground by the pump is introduced into a dewatering bag to perform a dewatering treatment, and water separated by the dewatering treatment is caused to flow downstream of the tubular bag body in a pipeline. The method for dredging sediment in a pipeline according to 1, 2, 3, or 4.